The tecla library change log

    In the following log, modification dates are listed using the European
    convention in which the day comes before the month (ie. DD/MM/YYYY).
    The most recent modifications are listed first.

    10/06/2012 mcs@astro.caltech.edu
               enhance.c configure.in
    	     I had incorrectly assumed that system-V pseudo-terminal
    	     allocation and system-V streams terminals always went
    	     together.  However system-V pseudo terminal allocation is
    	     now part of UNIX98, and this has been adopted into many BSD
    	     style operating systems, without the use of system-V
    	     streams. On such systems the lack of system-V streams IOCTL
                 opcodes prevented system-V pseudo-terminal allocation being
                 used. This was hidden under Linux until recently, because
                 it had a stropts.h file, which made it appear as though
                 Linux supported system-V streams terminals.

    	     I have now created separate configuration tests and options
    	     in the configure script for system-V terminal allocation
    	     and system-V streams. On systems that only have the former,
                 the latter won't be used.

    16/05/2005 mcs@astro.caltech.edu
               getline.c
    	     When an initial input line was presented to gl_get_line()
    	     for editing, the new input line was incorrectly appended to
    	     the previous input line, instead of replacing it.

    10/01/2004 Derek Jones (documented here by mcs@astro.caltech.edu)
               getline.c
                 Derek discovered that the function that computes the
                 width of the prompt, was not correctly skipping over 3 of
                 the 6 possible prompt-formatting directives. Thus, when
                 the %f,%p or %v prompt-formatting directives were used,
                 the width of the prompt was incorrectly calculated. The
                 fix was to copy the list of directives from
                 gl_display_prompt(). I have also added a comment to
                 gl_display_prompt(), to warn anybody who adds or removes
                 formatting directives there, to also do the same to
                 gl_displayed_prompt_width().

    31/10/2004 mcs@astro.caltech.edu (problem reported by Godfrey van der Linden)
               getline.c
                 The gl_event_handler() function had the endif of a
                 conditional compilation clause in the wrong place. This
                 only upset the compiler on unusual systems that don't
                 have select(). The problem was seen under Mac OS X, due
                 to the configuration problem in 1.6.0 that caused the
                 configure script to mistakenly report that select wasn't
                 available.

    31/10/2004 mcs@astro.caltech.edu (info provided by Ivan Rayner)
               configure.in configure Makefile.in
                 Ivan reported that under IRIX 6.5 it is necessary to add
                 -D_XOPEN_SOURCE=500 to the compiler flags, when compiling
                 the reentrant version of the library. Thus, whereas
                 previously I hardwired the value of DEFINES_R in
                 Makefile.in, I have now made this a variable in the
                 configure script, which is augmented with the above
                 addition, within an IRIX-specific switch clause.

                 Also apparently configure leaves the RANLIB variable
                 blank, instead of setting it to ":", so I have now
                 explicitly set this to ":", within the new IRIX clause of
                 the configure script.

    31/10/2004 mcs@astro.caltech.edu (info provided by Ivan Rayner)
               getline.c
                 Under IRIX, the compiler warned that gl_read_unmasked()
                 was returning an int, which was then being assigned to an
                 enumeration type. This is techically fine, but it
                 highlighted the fact that I had meant to declare
                 gl_read_unmasked() to directly return the enumerated
                 type. I have now done so.

    26/09/2004 mcs@astro.caltech.edu
               getline.c
                 Users can now turn off interactive command-line editing
                 by setting the TERM environment variable to the word "dumb".

    18/07/2004 mcs@astro.caltech.edu (problem noted by Michael MacFaden)
               getline.c
                 Calling gl_terminal_size() on a system without support
                 for SIGWINCH caused a divide-by-zero error in an unintended
                 call to gl_erase_line(), because gl_update_size() was
                 incorrectly being called to query the terminal size,
                 instead of gl_query_size().

    18/07/2004 Padraig Brady  (documented here by mcs@astro.caltech.edu)
               getline.c
                 The suspend and termination signal-handlers installed by
                 gl_tty_signals(), were being installed swapped.

    03/06/2004 Mike Meaney  (documented here by mcs@astro.caltech.edu)
               getline.c
                 Mike pointed out the fact that the curses setupterm()
                 function is actually documented to exit the application
                 if an error occurs while its optional errret argument is
                 NULL. I hadn't noticed this, and because I didn't need
                 the extra information returned in the errret argument, I
                 was passing it a NULL. As suggested by Mike, I now pass
                 this argument a pointer to a dummy errret variable.

    23/05/2004 mcs@astro.caltech.edu (problem noted by John Beck)
               man/func/cpl_complete_word.in
                 Some of the prototypes of functions and types documented
                 by the cpl_complete_word man page, weren't listed in the
                 Synopsis section of this man page. They are now listed
                 there.

    23/05/2004 mcs@astro.caltech.edu
               getline.c man/func/gl_get_line.in
                 I have now added support for calling gl_normal_io() from
                 any callback functions that the application installs by
                 calling either gl_inactivity_timeout(), or gl_watch_fd().
                 Previously, if one of these callback functions called
                 gl_normal_io(), then after returning to gl_get_line(),
                 gl_get_line() would incorrectly assume that the terminal
                 was still in raw I/O mode. Now, gl_get_line() checks to
                 see if gl_normal_io() was called by the callback, and
                 if so, calls _gl_raw_io() to reinstate raw I/O mode.

    21/05/2004 mcs@astro.caltech.edu
               configure.in configure
                 On Mac OS X the code that the configure script used to
                 check for select() failed due to missing symbols in
                 sys/select.h. Moving the inclusion of sys/select.h to
                 after the inclusion of sys/time.h, sys/types.h and
                 sys/unistd.h fixed this.

    11/05/2004 mcs@astro.caltech.edu
               getline.c man/func/gl_get_line.in
                 If the line buffer returned by one call to gl_get_line()
                 was passed as the start_line argument of the next call to
                 gl_get_line(), then instead of the just-entered line
                 being presented back to the user for further editing, the
                 start_line argument was effectively ignored, because the
                 line buffer whose pointer was being passed back, was
                 being cleared before the start_line pointer was examined.
                 This appears to have been a case of me incorrectly
                 thinking that I had forgotten to initialize gl->line[]
                 and gl->ntotal in the gl_reset_input_line() function, and
                 then "fixing" this supposed omission. Removing this
                 erroneous fix, restored things to how they were meant to
                 be. To make it unlikely that I will make the same mistake
                 again, I have renamed the function from
                 gl_reset_input_line() to gl_reset_editor(), to stop it
                 looking as though it is meant to reset the contents of
                 the input line (that is what gl_truncate_buffer() is
                 for), explicitly stated that it doesn't clear the input
                 line, in the header comments of the function, and added a
                 prominent warning comment in the body of the function.

                 Also, since support for passing back the returned line
                 pointer via the start_line argument of the next call to
                 gl_get_line(), wasn't documented in the man page, but was
                 meant to be supported, and definitely used to work, I
                 have now amended the man page documentation of
                 gl_get_line() to explicitly state that this feature is
                 officially supported.

    2?/04/2004 Released 1.6.0

    22/04/2004 mcs@astro.caltech.edu  (Fixed a bug reported by John Beck)
               getline.c
                 When an error, signal, or other abnormal event aborted
                 gl_get_line(), the cleanup code that restored the
                 terminal to a sane state, also overwrote the value of
                 errno that was associated with the aborting event. An
                 I/O error occurring in the cleanup code would have also
                 overwritten the value to be returned by
                 gl_return_status(), and thus remove any possibility of
                 the caller finding out what really caused gl_get_line()
                 to abort. I have now written a new internal function
                 called, gl_record_status(), which records the completion
                 status to be returned by gl_return_status(), and the
                 value to assign to errno just before gl_get_line()
                 returns. This is called wherever code detects conditions
                 that require gl_get_line() to return early. The function
                 ensures that once an abnormal completion status has been
                 recorded for return, subsequent completions statuses
                 aren't recorded. This ensures that the caller sees the
                 original cause of the abnormal return, rather than any
                 error that occurs during cleaning up from this before
                 return.

    17/04/2004 mcs@astro.caltech.edu
               getline.c
                 If an application's callback called gl_read_char() after
                 calling gl_normal_io(), it would inappropriately
                 redisplay the input line, when it called _gl_raw_io() to
                 temporarily switch the terminal back into raw mode.

                 To fix this, _gl_raw_io() now takes a new 'redisplay'
                 argument, which specifies whether or not to queue a
                 redisplay of the input line. I also created a new
                 gl->postpone flag, which is set by gl_normal_io(), and
                 cleared by _gl_raw_io() (when its redisplay argument is
                 true). When this flag is set, gl_flush_output() ignores
                 queued redisplays, as it generally should between calls
                 to gl_normal_io() and gl_raw_io(). Thus its effect is to
                 postpone redisplays while line editing is suspended.

    11/04/2004 mcs@astro.caltech.edu
               history.c man/misc/tecla.in
                 History searches can now include the globbing operators
                 *, ?, []. When a search prefix is found to have at least
                 one of these characters, then only history lines that
                 completely match that pattern are returned.

    11/04/2004 mcs@astro.caltech.edu  (issue raised by Mark Coiley)
               getline.c ioutil.c
                 There appears to be a bug in Solaris's terminal I/O.
                 When the terminal file descriptor is placed in
                 non-blocking I/O mode, and the terminal is switched from
                 canonical to raw mode, characters that were previously
                 entered in canonical I/O mode don't become available to
                 be read until the user types one character more. Select()
                 incorrectly says that there are no characters available,
                 and read() returns EAGAIN. This is only a problem for
                 gl_get_line() when gl_get_line() is in non-blocking
                 server I/O mode, so most users won't have experienced any
                 problems with this.

                 The only way that I have found to get read() to return
                 the characters, without the user first having to type
                 another character, is to turn off non-blocking I/O before
                 calling read(). Select() still claims that there are no
                 characters available to be read, but read happily returns
                 them anyway. Fortunately, one can perform non-blocking
                 terminal reads without setting the non-blocking I/O flag
                 of the file descriptor, simply by setting the VTIME
                 terminal attribute to zero (which I already was
                 doing). Thus, when in non-blocking server I/O, I now turn
                 off the non-blocking I/O flag, attempt to read one
                 character and only if this fails, do I then call the
                 select() based event handler to implement any configured
                 non-zero timeout, before attempting the read again. Of
                 course the non-blocking I/O flag is still needed for
                 writing, so I only turn it off temporarily while reading.

    25/03/2004 mcs@astro.caltech.edu  (bug reported by Gregory Harris)
               Makefile.in
                 It appears that when in February, I patched Makefile.in
                 to add abolute paths to the install-sh shell-script,
                 I accidentally replaced install-sh with install.sh. I
                 corrected the name in the Makefile.

    25/03/2004 Gregory Harris  (documented here by mcs)
               configure.in configure
                 Greg added the configuration parameters needed to build
                 the shared version of the libtecla library under FreeBSD.

    25/03/2004 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man/func/gl_get_line.in
               man/func/gl_read_char.in
                 I wrote a public function called gl_read_char(). Unlike
                 gl_query_char(), this function neither prompts the user
                 for input, nor displays the character that was entered.
                 In fact it doesn't write anything to the terminal, and
                 takes pains not to disturb any incompletely entered
                 input line, and can safely be called from application
                 callback functions.

    21/03/2004 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man/func/gl_get_line.in
               man/func/gl_query_char.in
                 I wrote a public function called gl_query_char(), which
                 prompts the user and awaits a single-character reply,
                 without the user having to hit return.

    23/02/2004 mcs@astro.caltech.edu (bug reported by Gregory Harris)
               configure.in configure getline.c enhance.c demo3.c
                 The configure script now checks for the sys/select.h
                 header file, and arranges for a C macro called
                 HAVE_SYS_SELECT_H to be set if it exists. Thus the files
                 that use select() now use this macro to conditionally
                 include sys/select.h where available. Apparently this
                 header is required under FreeBSD 5.1.

    23/02/2004 mcs@astro.caltech.edu
               getline.c libtecla.h man/func/gl_get_line.in
                 I wrote two new public functions, gl_append_history() and
                 gl_automatic_history(). Together these allow the
                 application to take over the responsibility of adding
                 lines to the history list from gl_get_line(). I then
                 documented their functionality in the gl_get_line man
                 page.
               Version 1.6.0
                 I incremented the minor version number of the library, to
                 comply with the requirement to do so when additions are
                 made to the public interface. See libtecla.map for
                 details.
               libtecla.map
                 I added a new 1.6.0 group for the new minor version, and
                 added the above pair of functions to it.

    15/02/2004 mcs@astro.caltech.edu (fixes a bug reported by Satya Sahoo)
               history.c
                 Calling gl_load_history() multiple times, eventually led
                 to a segmentation fault. This was due to the head of the
                 list of unused history string segments not getting
                 reset when the history buffer was cleared. While
                 debugging this problem I also noticed that the history
                 resizing function was way too complicated to verify, so
                 after fixing the above bug, I heavily simplified the
                 history resizing function, trading off a small reduction
                 in memory efficiency, for greatly improved clarity, and
                 thus made it much more verifiable and maintainable.

    14/02/2004 mcs@astro.caltech.edu (fixes a bug reported by Tim Burress).
               getline.c
                 If gl_change_terminal() was first used to tell
                 gl_get_line to read input from a file, then called later
                 to tell it to read subsequent input from a terminal, no
                 prompt would be displayed for the first line of
                 interactive input. The problem was that on reaching the
                 end of the input file, gl_get_line() should have called
                 gl_abandon_line(), to tell the next call to gl_get_line()
                 to start inputting a new line from scratch. I have added
                 this now.

    14/02/2004 Krister Walfridsson (documented here by mcs@astro.caltech.edu)
               Makefile.in
                 Krister noticed that I had failed to put $(srcdir)/ in front
                 of some invokations of install.sh. I have remedied this.
               config.guess config.sub
                 I hadn't updated these for a long time, so apparently they
                 didn't recognise the BSD system that Krister was using.
                 I have now updated them to the versions that come with
                 autoconf-2.59.

    22/01/2004 mcs@astro.caltech.edu
               keytab.c
                 When parsing key-binding specifications, backslash escaped
                 characters following ^ characters were not being expanded.
                 Thus ^\\ got interpretted as a control-\ character followed
                 by a \ character, rather than simply as a control-\
                 character.

    12/01/2004 mcs@astro.caltech.edu
               cplfile.c cplmatch.c demo2.c demo3.c demo.c direader.c
               expand.c getline.c history.c homedir.c pathutil.c pcache.c
               configure.in configure INSTALL
                 The configuration script now takes a
                 "--without-file-system" argument. This is primarily for
                 intended for embedded systems that either don't have
                 filesystems, or where the file-system code in libtecla is
                 unwanted bloat. It sets the WITHOUT_FILE_SYSTEM
                 macro. This removes all code related to filesystem
                 access, including the entire public file-expansion,
                 file-completion and path-lookup facilities. Note that the
                 general word completion facility is still included, but
                 without the normally bundled file completion
                 callback. Actually the callback is still there, but it
                 reports no completions, regardless of what string you ask
                 it to complete.

                 This option is described in the INSTALL document.

    12/01/2004 mcs@astro.caltech.edu
               getline.c configure.in configure INSTALL
                 The configuration script now takes a
                 "--without-file-actions" argument. This allows an
                 application author/installer to prevent users of
                 gl_get_line() from accessing the filesystem from the
                 builtin actions of gl_get_line(). It defines a macro
                 called HIDE_FILE_SYSTEM. This causes the
                 "expand-filename", "read-from-file", "read-init-files",
                 and "list-glob" action functions to be completely
                 removed. It also changes the default behavior of actions
                 such as "complete-word" and "list-or-eof" to show no
                 completions, instead of the normal default of showing
                 filename completions.

                 This option is described in the INSTALL document.

    11/01/2004 mcs@astro.caltech.edu
               getline.c man/func/gl_get_line.in
                 In case an application's customized completion handler
                 needs to write to the terminal for some unforseen reason,
                 there needs to be a way for the it to cleanly suspend raw
                 line editing, before writing to the terminal, and the
                 caller then needs to be aware that it may need to
                 resurrect the input line when the callback returns. I
                 have now arranged that the completion callback functions
                 can call the gl_normal_io() function for this purpose,
                 and documented this in the gl_get_line() man page.

    11/01/2004 mcs@astro.caltech.edu  (In response to a bug report by Satya Sahoo)
               getline.c
                 The gl_configure_getline() function makes a malloc'd copy
                 of the names of the configuration files that it is asked
                 to read. Before the bug fix, if the application made one
                 or more calls to this function, the memory allocated by
                 the final call that it made before calling del_GetLine(),
                 wasn't being freed. Note that memory allocated in all but
                 the final call was being correctly freed, so the maximum
                 extent of the memory leak was the length of the file
                 name(s) passed in the final call to
                 gl_configure_getline(), and an application that didn't
                 call gl_configure_getline() didn't suffer any leak.

    20/12/2003 mcs@astro.caltech.edu
               history.c
                 Ellen tested the history fix that I reported below, and
                 pointed out that it still had a problem. This turned out
                 to be because getline.c was making some incorrect
                 assumptions about the new behavior of history.c. This
                 problem and the previous one both revolved around how
                 search prefixes were stored and discarded, so I have now
                 re-written this part of the code. Previously the search
                 prefix was retained by looking for a line with that
                 prefix, and keeping a pointer to that line. This saved
                 memory, compared to storing a separate copy of the
                 prefix, but it led to all kinds of hairy
                 interdependencies, so I have now changed the code to keep
                 a separate copy of search prefixes. To keep the memory
                 requirements constant, the search prefix is stored in the
                 history buffer, like normal history lines, but not
                 referenced by the time-ordered history list. The prefix
                 can now be kept around indefinitely, until a new search
                 prefix is specified, regardless of changes to the
                 archived lines in the history buffer. This is actually
                 necessary to make the vi-mode re-search actions work
                 correctly. In particular, I no longer discard the search
                 prefix whenever a history search session ends. Also,
                 rather than have getline.c keep its own record of when a
                 history session is in progress, it now consults
                 history.c, so that failed assumptions can't cause the
                 kind of discrepancy that occurred before. For this to
                 work, getline.c now explicitly tells history.c to cancel
                 search sessions whenever it executes any non-history
                 action.

    14/12/2003 mcs@astro.caltech.edu (bug reported by Ellen Oschmann)
               history.c
                 If one searched backwards for a prefix, then returned to
                 the original line, changed that line, then started
                 another backwards prefix search, getline incorrectly
                 discarded the new search prefix in the process of
                 throwing away its cached copy of the previous pre-search
                 input line. In other words getline was belatedly
                 cancelling a previous search, after a new search had
                 already partially begun, and thus messed up the new
                 search. The obvious fix was to arrange for the current
                 search to be cancelled whenever the history pointer
                 returns to its starting point, rather than waiting for
                 the next search to begin from there.

    14/12/2003 mcs@astro.caltech.edu
               history.c
                 _glh_recall_line() was returning the last line in the
                 history buffer instead of the line requested by the
                 caller. This only affected the obscure "repeat-history"
                 action-function, which probably isn't used by anybody.

    09/12/2003 Version 1.5.0 released.

    28/09/2003 mcs@astro.caltech.edu
               homedir.c
                 When the home directory of the login user is requested,
                 see if the HOME environment variable exists, and if so
                 return its value, rather than looking up the user's home
                 directory in the password file. This seems to be the
                 convention adopted by other unix programs that perform
                 tilde expansion, and it works around a strange problem,
                 where a third-party libtecla program, statically compiled
                 under an old version of RedHat, unexpectedly complained
                 that getpwd() returned an error when the program was run
                 under RedHat 9.

    01/09/2003 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man/func/gl_get_line.in
               man/func/gl_register_action.in.
                 It is now possible for an application to register
                 external functions as action functions. These actions are
                 initially bound to specified key-sequences, but if they
                 are registered before the user's configuration file is
                 loaded, they can also be re-bound by the user to
                 different key-sequences. The function used to register a
                 new action, is called gl_register_action().  Action
                 functions are passed a readonly copy of the input line
                 and the cursor position. They can display text to the
                 terminal, or perform other operations on the application
                 environment. Currently, they can't edit the input line or
                 move the cursor. This will require the future addition of
                 functions to queue the invokation of the built-in action
                 functions.

    26/08/2003 mcs@astro.caltech.edu
               getline.c
                 I modified gl_update_buffer() to ensure that the cursor
                 stays within the input line after external line
                 modifications, and to queue a redisplay of the
                 potentially modified input line.

    21/07/2003 mcs@astro.caltech.edu
               configure.in configure Makefile.in Makefile.stub INSTALL
                 By specifying --without-man-pages or --with-man-pages=no
                 as command-line arguments to the configure script, it is
                 now possible to have the configure script skip the
                 man-page preprocessing step, and arrange for the man-page
                 installation targets in the Makefile to do nothing. This
                 option is designed for people who embed libtecla within
                 other packages. It is also used by Makefile.stub when
                 the distclean target is specified.

    21/07/2003 mcs@astro.caltech.edu
               configure.in configure
                 The previous workaround for recent versions of gcc
                 placing /usr/local/include at the start of the system
                 inlcude-file search path, broke something else.  The fix
                 placed /usr/include before gcc's include area, which
                 meant that gcc's modified version of stdarg.h was being
                 ignored in deference to the version in /usr/include. I
                 have changed the fix to have gcc report the search path,
                 then have awk add options to CFLAGS to reorder this path,
                 plaing /usr/local/include at the end.

                 Also, under Solaris 9, including term.h without first
                 including curses.h results in complaints about undefined
                 symbols, such as bool. As a result the configure script's
                 test for term.h was failing. I have now modified it to
                 include curses.h in the test code that it uses to check
                 for term.h. In the process I also improved the tests for
                 curses.h and term.h to prevent an ncurses version of
                 term.h from being used with the system-default version of
                 curses.h.

    29/06/2003 mcs@astro.caltech.edu
               Makefile.in direader.c homedir.c
                 On some systems (eg. linux) the _POSIX_C_SOURCE
                 feature-test macro is set by system headers, rather than
                 being an option set by a project's Makefile at
                 compilation time.  In software, such as tecla, where the
                 definition of this macro is used as an indication of
                 whether to use the non-reentrant or reentrant versions of
                 system functions, this means that the reentrant functions
                 are always used, regardless of whether this macro is set
                 or not by the project Makefile. Thus, on such systems the
                 reentrant and non-reentrant versions of the tecla library
                 are essentially identical. This has a couple of
                 drawbacks.  First, since thread-safe functions for
                 traversing the password file don't exist, the supposedly
                 non-reentrant version of the tecla library can't support
                 ambiguous tab-completion of usernames in ~username/
                 constructions. Secondly, on some systems the use of
                 reentrant system functions dictates the use of a shared
                 library that isn't needed for the non-reentrant
                 functions, thus making it more difficult to distribute
                 binary versions of the library.

                 To remedy this situation I have modified the DEFINES_R
                 variable in Makefile.in to arrange for the compiler to
                 define a C macro called PREFER_REENTRANT when it is
                 compiling the reentrant version of the tecla library.
                 This macro is now used in the source code to determine
                 when to require reentrant code. Whithin the source code,
                 wherever a potentially non-reentrant interface is used,
                 the existance of both this macro and a suitably valued
                 _POSIX_C_SOURCE macro, are tested for to see if a
                 reentrant alternative to the problem code should be used.

    22/06/2003 mcs@astro.caltech.edu
               getline.c
                 I changed the way that redisplays are requested and
                 performed.  Redisplays are now queued by calling
                 gl_queue_redisplay(), and subsequently performed by
                 gl_flush_output(), when the queue of already pending
                 output has been completely dispatched. This was necessary
                 to prevent event handlers from filling up the output
                 queue with redisplays, and it also simplifies a number of
                 things. In the process I removed the gl_queue_display()
                 function. I also wrote a gl_line_erased() function, which
                 is now called by all functions that erase the input
                 line. I also split the gl_abandon_line() function into
                 public and private callable parts, and used the private
                 version internally to arrange to discard the input line
                 after errors.

                 The raw_mode flag was not being initialized by new_GetLine().
                 It is now initialized to zero.

                 I removed the zapline flag, since using the endline flag to
                 communicate the desire to terminate the line, did the same
                 thing.

                 gl_terminal_move_cursor() now does nothing when the input
                 line isn't displayed.

    18/03/2003 mcs@astro.caltech.edu
               getline.c
                 Fixed bug which was causing newlines not to be output
                 at the end of each newly entered line. I was
                 interpreting the gl->endline flag in conflicting ways in
                 two places. To fix this I have created a gl->displayed
                 flag. This flags whether an input line is currently
                 displayed.

    17/03/2003 mcs@astro.caltech.edu
               getline.c libtecla.h man/func/gl_get_line.in
               man/func/gl_erase_terminal.in libtecla.map
                 I added a new function that programs can call to clear
                 the terminal between calls to gl_get_line().

    11/03/2003 mcs@astro.caltech.edu
               configure.in configure
                 Under linux when _POSIX_C_SOURCE is defined, getpwent()
                 and associated functions become undefined, because
                 _SVID_SOURCE and _BSD_SOURCE become undefined. Adding
                 these feature macros back to CFLAGS resolves this.

    06/03/2003 mcs@astro.caltech.edu
               getline.c libtecla.map man/func/gl_get_line.in
                 Following the lead of Edward Chien, I wrote a function
                 called gl_bind_keyseq(), which binds a specified
                 key-sequence to a given action, or unbinds the
                 key-sequence.

    24/02/2003 mcs@astro.caltech.edu
               getline.c libtecla.map man/func/cpl_complete_word.in
                 I implemented a simple function called
                 cpl_recall_matches().  This recalls the return value of
                 the last call to cpl_complete_word().

    19/01/2003 mcs@astro.caltech.edu
               getline.c
                 The documented signal handling, fd event-handling,
                 inactivity timeout handling, and server-mode non-blocking
                 I/O features are now implemented for non-interactive
                 input streams, such as pipes and files.

    19/01/2003 mcs@astro.caltech.edu
               getline.c libtecla.h man/func/gl_get_line.in demo3.c
                 I added a new return status enumerator to report
                 when an end-of-file condition causes gl_get_line()
                 to return NULL.

    13/01/2003 mcs@astro.caltech.edu
               history.c
                 I rewrote the history facility. The previous
                 circular buffer implementation was a nightmare to change,
                 and it couldn't efficiently support certain newly
                 requested features. The new implementation stores history
                 lines in linked lists of fixed sized string segments,
                 taken from the buffer, with each line being reference
                 counted and recorded in a hash table. If the user enters
                 a line multiple times, only one copy of the line is now
                 stored. Not only does this make better use of the
                 available buffer space, but it also makes it easy to
                 ensure that a line whose prefix matches the current
                 search prefix, isn't returned more than once in sequence,
                 since we can simply see if the latest search result has
                 the same hash-table pointer as the previous one, rather
                 than having to compare strings. Another plus is that due
                 to the use of linked lists of nodes of fixed size line
                 segments, there is no longer any need to continually
                 shuffle the contents of the buffer in order to defragment
                 it. As far as the user is concerned, the visible
                 differences are as follows:

                 1. If the user enters a given line multiple times in a
                    row, each one will be recorded in the history list,
                    and will thus be listed by gl_show_history(), and
                    saved in the history file. Previously only one line
                    was recorded when consecutive duplicates were entered.
                    This was a kludge to prevent history recall from
                    recalling the same line multiple times in a row. This
                    only achieved the desired result when not recalling by
                    prefix.

                 2. Not only simple recall, but prefix-based history line
                    recalls now don't return the same line multiple times
                    in a row. As mentioned in (1) above, previously this
                    only worked when performing a simple recall, without a
                    search prefix.

    28/12/2002 mcs@astro.caltech.edu
               getline.c
                 The one-line function, gl_buff_curpos_to_term_curpos()
                 was only being used by gl_place_cursor(), so I inlined it
                 in that function, and removed it.

    28/12/2002 mcs@astro.caltech.edu
               getline.c
                 gl_suspend_process() was calling the application-level
                 gl_normal_io() and gl_raw_io() functions, where it should
                 have been calling the internal versions _gl_normal_io()
                 and _gl_raw_io().
                 Also gl_handle_signal() was masking and unmasking just
                 the signals of the first element of the gl[] array
                 argument. It now masks and unmasks all trappable signals.

    28/12/2002 mcs@astro.caltech.edu
               getline.c
                 Now that the number of terminal characters used to
                 display the current input line, is recorded, the relative
                 line on which the last character of the input line
                 resides can be determined without having to call
                 gl_buff_curpos_to_term_curpos(). This is now used by
                 gl_normal_io() via gl_start_newline(), so there is now no
                 need for gl_buff_curpos_to_term_curpos() to be
                 async-signal safe. I have thus removed the annoying
                 gl->cwidth[] array, and gl_buff_curpos_to_term_curpos()
                 now calls gl_width_of_char() directly again. There is
                 also now no need for the gl_line_of_char_start() and
                 gl_line_of_char_end() functions, so I have removed them.

    28/12/2002 mcs@astro.caltech.edu
               getline.c
                 Unfortunately it turns out that the terminfo/termcap
                 control sequence which is defined to delete everything
                 from the current position to the end of the terminal, is
                 only defined to work when at the start of a terminal
                 line. In gnome terminals in RedHat 8.0, if it is used
                 within a terminal line, it erases the whole terminal
                 line, rather than just what follows the cursor. Thus to
                 portably truncate the displayed input line it is
                 necessary to first use the control sequence which deletes
                 from the cursor position to the end of the line, then if
                 there are more terminal lines, move to the start of the
                 next line, and use the delete to end-of-terminal control
                 sequence, then restore the cursor position. This requires
                 that one know how many physical terminal lines are used
                 by the current input line, so I now keep a record of the
                 number of characters so far displayed to the terminal
                 following the start of the prompt, and the new
                 gl_truncate_display() function uses this information to
                 truncate the displayed input line from the current cursor
                 position.

    28/12/2002 mcs@astro.caltech.edu
               getline.c
                 gl_start_newline() now moves to an empty line following
                 the input line, rather than just to the next line. It
                 also arranges for the input line to be redisplayed before
                 editing resumes. A major user of this is gl_print_info(),
                 which now need not be followed by an explicit call to
                 gl_redisplay(), since the terminal input loop in
                 gl_get_input_line() ensures that gl_redisplay() is called
                 after any action function that asserts gl->redisplay.
                 Also, all functions that erase the displayed input line
                 can now call the gl_erase_line() function, which is
                 designed to work correctly even when a terminal resize
                 invalidates the horizontal cursor position.  Finally, the
                 new gl_queue_display() function is now used by functions
                 that need to arrange for the input line to be displayed
                 from scratch after the displayed line has been erased or
                 invalidated by other text being written to the terminal.
                 All of these changes are aimed at reducing the number of
                 places that directly modify gl->term_curpos and
                 gl->redisplay.

    22/12/2002 Markus Gyger   (logged here by mcs)
               Makefile.in update_html
    	     In places where echo and sed were being used to extract
    	     the base names of files, Markus substituted the basename
    	     command. He also replaced explicit cp and chmod commands
    	     with invokations of the install-sh script.
               configure.in
                 Use $target_os and $target_cpu, where appropriate,
    	     instead of $target.
               configure.in
                 The Solaris man function and library man pages should
    	     be in sections 3lib and 3tecla respectively, only in
    	     Solaris version 2.8 and above.
               configure.in
                 Markus provided values for the man page configuration
                 variables for HPUX.
               man/*/*.in
                 I had missed parameterizing man page section numbers in
    	     the man page titles, Markus corrected this.
               man/func/libtecla_version.in
                 Fixed incorrect section number in the link to the
                 libtecla man page.
               homedir.c
                 When compiled to be reentrant, although one can't use the
    	     non-reentrant getpwent() function to scan the password
    	     file for username completions, one can at least see if
    	     the prefix being completed is a valid username, and if
    	     the username of the current user minimally matches the
    	     prefix, and if so list them. I simplified Markus'
    	     modification by adding a prefix argument to the
                 _hd_scan_user_home_dirs() function, and redefining the
    	     function description accordingly, such that now it
    	     reports only those password file entries who's usernames
    	     minimally match the specified prefix. Without this, it
    	     would have been necessary to peak inside the private data
    	     argument passed in by cf_complete_username().
                 Markus also provided code which under Solaris uses the
                 non-reentrant interfaces if the reentrant version of the
                 library isn't linked with the threads library.

    19/12/2002 mcs@astro.caltech.edu
               Makefile.in
                 Markus pointed out that LDFLAGS was being picked up by
                 the configure script, but not then being interpolated
                 into te Makefile. I have thus added the necessary
                 assignment to Makefile.in and arranged for the value of
                 LDFLAGS to be passed on to recursive make's. I also did
                 the same for CPPFLAGS, which had also been omitted.

    18/12/2002 mcs@astro.caltech.edu
               man/* man/*/* configure.in configure Makefile.in
               update_html
                 It turns out that the assignment of man page sections to
                 topics differs somewhat from system to system, so this is
                 another thing that needs to be configured by the main
                 configuration script, rather than being hardwired. All
                 man pages have now been moved into suitably named
                 topic-specific sub-directories of the top-level man
                 directory, and instead of having a numeric suffix, now
                 have the .in suffix, since they are now preprocessed by
                 the configure script, in the same fashion as Makefile.in.
                 Whithin these *.in versions of the man pages, and within
                 Makefile.in, the installation subdirectory (eg. man1) and
                 the file-name suffix (eg. 1), are written using
                 configuration macros, so that they get expanded to the
                 appropriate tokens when the configure script is run. In
                 principle, the man pages could also take advantage of
                 other configuration macros, such as the one which expands
                 to the library installation directory, to include full
                 path names to installed files in the documentation, so in
                 the future this feature could have more uses than just
                 that of parameterizing man page sections.

    18/12/2002 mcs@astro.caltech.edu
               man3 man3/* Makefile.in html/index.html update_html
                 Markus suggested splitting the gl_get_line(3) man page
                 into user and developer sections, and also pointed out
                 that the enhance man page should be in section 1, not
                 section 3. I have thus created a top-level man
                 directory in which to place the various sections, and
                 moved the man3 directory into it. The enhance.3 man page
                 is now in man/man1/enhance.1. I have extracted all
                 user-oriented sections from the gl_get_line(3) man page
                 and placed them in a new man7/tecla.7 man page.

    18/12/2002 mcs@astro.caltech.edu
               getline.c
                 Terminal resizing was broken in normal mode, due to
                 me forcing the terminal cursor position to zero in the
                 wrong place in gl_check_caught_signal().

    14/12/2002 Markus Gyger  (logged here by mcs)
               configure.in configure
                 Under Solaris, recent versions of gcc search
                 /usr/local/include for header files before the system
                 directories. This caused a problem if ncurses was
                 installed under Solaris, since the termcap.h include file
                 in /usr/local/include ended up being used at compile
                 time, whereas the system default version of the curses
                 library was used at link time. Since the two libraries
                 declare tputs() differently, this evoked a complaint from
                 gcc. Markus came up with a way to force Gnu cpp to move
                 /usr/local/include to the end of the system-include-file
                 search path, where it belongs.

    13/12/2002 mcs@astro.caltech.edu
               man3/gl_io_mode.3
                 I rewrote the man page which documents the new non-blocking
                 server I/O mode.

    12/12/2002 mcs@astro.caltech.edu
               demo3.c
                 I wrote a new version of demo3.c, using signal handlers
                 that call gl_handle_signal() and gl_abandon_line(), where
                 previously in this demo, these functions were called from
                 the application code.

    05/12/2002 mcs@astro.caltech.edu
               getline.c
                 gl_normal_io(), gl_raw_io() and gl_handle_signal() and
                 gl_abandon_line() are now signal safe, provided that
                 signal handlers that call them are installed with sa_mask's
                 that block all other signals who's handlers call them.
                 This is the case if gl_tty_signals() is used to install
                 signal handlers that call any of these functions.

                 A major stumbling block that had to be overcome was that
                 gl_displayed_char_width() calls isprint(), which can't
                 safely be called from a signal handler (eg. under linux,
                 the is*() functions all use thread-specific data
                 facilities to support per-thread locales, and the
                 thread-specific data facilities aren't signal safe). To
                 work around this, all functions that modify the
                 input-line buffer, now do so via accessor functions which
                 also maintain a parallel array of character widths, for
                 use by gl_buff_curpos_to_term_curpos() in place of
                 gl_displayed_char_width(). Other minor problems were the
                 need to avoid tputs(), who's signal safety isn't defined.

    05/12/2002 Eric Norum        (logged here by mcs@astro.caltech.edu)
               configure.in
                 Eric provided the configuration information needed
                 to build shared libraries under Darwin (Max OS X).

    05/12/2002 Richard Mlynarik  (logged here by mcs@astro.caltech.edu)
               configure.in
                 AC_PROG_RANLIB gets the wrong version of ranlib when
                 cross compiling, so has now been replaced by an
                 invokation of AC_CHECK_TOOL. In addition, AC_CHECK_TOOL
                 is also now used to find an appropriate version of LD.

    05/12/2002 mcs@astro.caltech.edu (based on patch by Pankaj Rathore)
               getline.c libtecla.h libtecla.map man3/gl_get_line.3
                 The new gl_set_term_size() function provides a way
                 to tell gl_get_line() about changes in the size of
                 the terminal in cases where the values returned by
                 ioctl(TIOCGWINSZ) isn't correct.

    05/12/2002 mcs@astro.caltech.edu
               getline.c
                 Rather than calling sprintf() to see how much space would
                 be needed to print a given number in octal, I wrote a
                 gl_octal_width() function, for use by
                 gl_displayed_char_width().  This makes the latter
                 function async signal safe.

    05/12/2002 mcs@astro.caltech.edu
               chrqueue.c
                 Whenever the buffer is exhausted, and getting a new
                 buffer node would require a call to malloc(), attempt
                 to flush the buffer to the terminal. In blocking I/O
                 mode this means that the buffer never grows. In
                 non-blocking I/O mode, it just helps keep the buffer
                 size down.

    05/12/2002 mcs@astro.caltech.edu
               freelist.h freelist.c
                 The new _idle_FreeListNodes() function queries the
                 number of nodes in the freelist which aren't currently
                 in use.

    05/12/2002 mcs@astro.caltech.edu
               Makefile.stub
                 This now accepts all of the targets that the configured
                 makefile does, and after configuring the latter makefile,
                 it invokes it with the same options.

    03/12/2002 mcs@astro.caltech.edu
               mans3/gl_io_mode.3
                 I completed the man page for all of the new functions
                 related to non-blocking I/O.

    01/12/2002 mcs@astro.caltech.edu
               man3/gl_get_line.3
                 I wrote a long section on reliable signal handling,
                 explaining how gl_get_line() does this, how to make
                 use of this in a program, and how to handle signals
                 reliably when faced with other blocking functions.
                 This basically documents what I have learnt about
                 signal handling while working on this library.

    01/12/2002 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 In non-blocking server mode, the gl_replace_prompt()
                 function can now be used between calls to gl_get_line()
                 if the application wants to change the prompt of the
                 line that is being edited.

    01/12/2002 mcs@astro.caltech.edu
               man3/gl_get_line.3
                 I documented the new gl_return_status() and
                 gl_error_message() functions.

    01/12/2002 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 Added SIGPOLL and SIGXFSZ to the list of signals that
                 are trapped by default. These are process termination
                 signals, so the terminal needs to be restored to a
                 usable state before they terminate the process.

    27/11/2002 mcs@astro.caltech.edu
               getline.c libtecla.h
                 Completed the essential changes needed to support
                 non-blocking server-I/O mode.

                 The new gl_io_mode() function allows one to switch to
                 and from non-blocking server-I/O mode.

                 The new gl_raw_io() function is used in non-blocking
                 server-I/O mode to switch the terminal into non-blocking
                 raw I/O mode.

                 The new gl_normal_io() function is used in non-blocking
                 server-I/O mode to switch the restore the terminal to
                 a normal, blocking state. This is used to suspend line
                 input before suspending the process or writing messages
                 to the terminal.

                 The new gl_tty_signals() function installs specified
                 signals handlers for all signals that suspend, terminate
                 or resume processes, and also for signals that indicate
                 that the terminal has been resized. This not only saves
                 the application from having to keep its own ifdef'd list
                 of such signals, of which there are many, but it also
                 makes sure that these signal handlers are registered
                 correctly. This includes using the sa_mask member of each
                 sigaction structure to ensure that only one of these
                 handlers runs at a time. This is essential to avoid the
                 signal handlers all trying to simultaneously modify
                 shared global data.

                 The new gl_handle_signal() function is provided for
                 responding (from application level) to signals caught by
                 the application. It handles process suspension, process
                 termination and terminal resize signals.

                 The new gl_pending_io() function tells the application
                 what direction of I/O gl_get_line() is currently waiting
                 for.

                 In non-blocking server I/O mode, the new
                 gl_abandon_line() function can be called between calls to
                 gl_get_line() to discard an input line and force the next
                 call to gl_get_line() to start the input of a new line.

                 Also, in non-blocking server-I/O gl_get_line() doesn't
                 attempt to do anything but return when one of the signals
                 that it is configured to catch is caught. This is
                 necessary because when in this mode, the application is
                 required to handle these signals when gl_get_line() is
                 running, and the default configuration of most of these
                 signals in gl_get_line() is to restore the terminal then
                 call the application signal handlers. This would be a
                 case of too many cooks spoiling the broth, so in this
                 mode, gl_get_line() always defers to the application's
                 signal handlers.

    26/11/2002 mcs@astro.caltech.edu
               getline.c libtecla.h
                 I implemented a couple of new functions to support
                 reliable signal handling, as now documented
                 (see above) in the gl_get_line(3) man page.

                 The new gl_catch_blocked() function tells gl_get_line()
                 to unblock all configured signals around calls to
                 long-running functions, not only those that aren't
                 blocked when gl_get_line() is called. This allows
                 the caller to implement reliable signal handling,
                 since the unblocking is only done from within code
                 protected by sigsetjmp(), which avoids race conditions.

                 The new gl_list_signals() function fills a provided
                 sigset_t with the set of signals that gl_get_line() is
                 currently configured to catch. This allows callers to
                 block said signals, such that they are only unblocked by
                 gl_get_line() when it is waiting for I/O. When used in
                 conjunction with the gl_catch_blocked() function, this
                 removes the potential for race conditions.

                 Also, when gl_get_line() installs its signal handler,
                 it uses the sa_mask member of the sigaction structure
                 to ensure that only one instance of this signal handler
                 will ever be executing at a time.

    25/11/2002 mcs@astro.caltech.edu (bug reported by Pankaj Rathore)
               getline.c
                 When any history recall action was invoked when the
                 input line buffer was full, an error message would be
                 displayed complaining about the length of the string
                 in the line input buffer being inconsistent with the
                 specified allocated size. This was because instead of
                 sending the allocated size of the input line, I was
                 sending the length excluding the element that is
                 reserved for the '\0' terminator. Sending it the
                 correct size corrected the problem.

    24/11/2002 mcs@astro.caltech.edu
               getline.c
                 All public functions which take GetLine objects as
                 arguments now block signals on entry and restore the
                 signal mask on return. This was an attempt to make it
                 safe to call getline functions from signal handlers, but
                 the fact is that the functions that I really wanted this
                 to apply to, potentially call malloc(), so this currently
                 isn't the case.

    23/11/2002 mcs@astro.caltech.edu
               getline.c libtecla.h
                 The new gl_return_status() function returns an enumerated
                 return status which can be used to query what caused
                 gl_get_line() to return.

    22/11/2002 mcs@astro.caltech.edu
               Most existing .c and .h files, plus errmsg.c errmsg.h
               Makefile.rules
                 Until now, many library functions would report error
                 messages to stderr. This isn't appropriate for library
                 functions, so in place of this behavior, error messages
                 are now recorded in internal ErrMsg objects, and passed
                 between modules via new module-specific error querying
                 functions. In addition, errno is now set appropriately.
                 Thus when gl_get_line() and related functions return an
                 error, strerror() can be used to look up system errors,
                 and gl_error_message() can be used to recover a higher level
                 error message. Note that error messages that are
                 responses to user actions continue to be reported to the
                 terminal, as before.

    21/11/2002 mcs@astro.caltech.edu
               getline.c keytab.h keytab.c Makefile.rules
                 I wrote a new version of _kt_lookup_binding() that didn't
                 require the caller to have access to the innards of a
                 KeyTab object. This then enabled me to move the definition
                 of KeyTab objects into keytab.c and make the typedef in
                 keytab.h opaque. Many nested includes were also moved from
                 keytab.h into keytab.c.

    05/11/2002 mcs@astro.caltech.edu
               getline.c libtecla.map libtecla.h demo3.c
                 I split the old gl_resize_terminal() function into
                 two parts, gl_query_size() and gl_update_size(), with
                 the latter calling the former to get the new terminal
                 size.

    05/11/2002 mcs@astro.caltech.edu
               getline.c
                 I fixed a long time bug in the terminal resizing code.
                 When the cursor wasn't on the last terminal line of the
                 input line, the resizing code would redisplay the
                 the line one or more lines above where it should be
                 restored. This was due to an error in the calculation of
                 the number of lines above the cursor position.

    04/11/2002 mcs@astro.caltech.edu
               demo.c demo2.c demo3.c
                 I used the new gl_display_text() function to display
                 introductory text at the startup of each of the demo
                 programs. The text is enclosed within a box of asterixes,
                 drawn dynamically to fit within the confines of the
                 available terminal width.

    04/11/2002 mcs@astro.caltech.edu
               libtecla.h getline.c ioutil.c ioutil.h Makefile.rules
               libtecla.map man3/gl_get_line.3 man3/gl_display_text.3
                 Needing a way to display introductory text intelligently
                 in the demo programs, I wrote and documented the
                 gl_display_text() function. This justifies arbitrary
                 length text within the bounds of the terminal width,
                 with or without optional indentation, prefixes and
                 suffixes.

    03/11/2002 mcs@astro.caltech.edu
               demo3.c Makefile.rules
                 I wrote a new demonstration program. This program acts
                 exactly like the main demonstration program, except that
                 it uses an external event loop instead of using the
                 gl_get_line() internal event loop. This is thus an example
                 of the new non-blocking server I/O facility.

    02/11/2002 mcs@astro.caltech.edu
               getline.c keytab.c keytab.h libtecla.h man3/gl_get_line.3
               man3/gl_completion_action.3
                 I added the ability to register additional word
                 completion actions via the new function
                 gl_completion_action().  All action functions now take a
                 new (void *data) argument, which is stored with the
                 function in the symbol table of actions. The new
                 gl_completion_action() function uses this feature to
                 record dynamically allocated objects containing the
                 specified completion function and callback data along
                 with either the gl_complete_word() action function, or
                 the gl_list_completions() action function.  These two
                 actions continue to use the builtin completion functions
                 when their data pointer is NULL.

    20/10/2002 mcs@astro.caltech.edu
               The following are changes merged from the non-blocking
               gl_get_line() development branch.

               getline.c
                 I wrote a gl_start_newline() function, to replace all of
                 the explicit calls to output \r\n to stdout.

                 Informational messages are now written to the terminal
                 using a new variadic function called gl_print_info().
                 This starts a newline, writes string arguments until a
                 special argument, GL_END_INFO, is seen, then starts
                 another newline.

                 Changed _output_ to _print_ in the following function
                 names gl_output_control_sequence(), gl_output_char(),
                 gl_output_string() and gl_output_raw_string().

                 gl_print_raw_string() now has a length argument, so that
                 strings that aren't terminated with '\0' can be printed.

                 The display of the initial contents of a new line to be
                 edited has been moved into a new function called
                 gl_present_line().

                 The gl_get_input_line() function now takes the prompt
                 string as an argument so that gl_replace_prompt() can be
                 called from within this function instead of from
                 gl_get_line().

                 Keyboard input is now buffered in a persistent buffer in
                 the parent GetLine object. gl_read_character() checks
                 this for unprocessed characters in preference to calling
                 gl_read_terminal() to append characters to it.  A new
                 function, gl_discard_chars(), removes processed
                 characters from this buffer. This change is in
                 preparation for a non-blocking version of gl_get_line(),
                 where partially input key-sequences must be stored
                 between calls to gl_get_line().

               getline.c getline.h history.c history.h cplmatch.c \
               cplmatch.h expand.c expand.h
                 All terminal output from gl_get_line() is now routed
                 through a GL_WRITE_FN() callback function called
                 gl_write_fn. Internal functions in cplmatch.c,
                 expand.c and history.c have been created which take
                 such callbacks to write output. These are used both
                 by functions in getline.c, to display file completions,
                 expansions, history etc, and as the internals of existing
                 public functions in these files that print to stdio
                 streams. In the latter case an internal stdio
                 GL_WRITE_FN() callback is substituted, so that the
                 functions behave as before.

               getline.c chrqueue.c chrqueue.h
                 The gl_write_fn() callback used by gl_get_line() now
                 writes to a queue, implemented in chrqueue.c. This queue
                 is implemented as a list of blocks of buffer segments,
                 the number of which shrink and grow as
                 needed. The contents of the queue are flushed to the
                 terminal via another GL_WRITE_FN() callback passed to the
                 queue object. Currently gl_get_line() passes an internal
                 function assigned to gl->flush_fn, called
                 gl_flush_terminal(), which writes the contents of the
                 queue to the terminal, and knows how to handle both
                 blocking and non-blocking I/O. The output queue is
                 designed to be flushed to the terminal incrementally, and
                 thereby also facilitates non-blocking I/O.

               getline.c getline.h
                 gl_get_line() now reads all input via the GL_READ_FN()
                 callback, assigned to gl->read_fn. Currently this is
                 set to an internal function called gl_read_terminal(),
                 which knows how to handle both blocking and
                 non-blocking I/O.

               getline.c libtecla.h
                 The new gl_set_nonblocking() function can be used to
                 enable or disable non-blocking I/O. The default is still
                 blocking I/O. In non-blocking mode, the terminal is told
                 not to wait when either reading or writing would block.
                 gl_get_line() then returns, with a return value of NULL,
                 but with the terminal left in raw mode, so that the
                 caller's event loop can detect key presses. The caller
                 should call gl_return_status() to check whether the NULL
                 return value was due to an error, lack of input, or
                 inability to write to the terminal without waiting. If
                 either reading or writing was said to have blocked, the
                 user then should check for I/O readiness in the specified
                 direction before calling gl_get_line() again to
                 incrementally build up the input line.

    05/08/2002 mcs@astro.caltech.edu
               man3/gl_get_line.3 man3/gl_inactivity_timeout.3
                 I documented the new gl_inactivity_timeout() function.

    08/07/2002 mcs@astro.caltech.edu
               libtecla.h getline.c libtecla.map
                 I added a new gl_inactivity_timeout() function. On
                 systems that have the select system call, this provides
                 the option of registering a function that is then called
                 whenever no I/O activity has been seen for more than a
                 specified period of time. Like the gl_watch_fd()
                 facility, timeout callbacks return a code which tells
                 gl_get_line() how to proceed after the timeout has been
                 handled.

    04/07/2002 mcs@astro.caltech.edu  (based on a bug report from Michael MacFaden)
               getline.c
                 The internal event handler wasn't responding to write
                 events on client file descriptors, due to a typo which
                 resulted in read events being checked for twice, and
                 writes not checked for at all.
               pathutil.c
                 The amount of space to allocate for pathnames is supposed
                 to come from PATH_MAX in limits.h, but I had neglected to
                 include limits.h. This went unnoticed because on most
                 systems the equivalent number is deduced by calling
                 pathconf(). Apparently under NetBSD this function doesn't
                 work correctly over NFS mounts.

    30/05/2002 Version 1.4.1 released.

    25/05/2002 mcs@astro.caltech.edu  (based on suggestions by Paul Smith)
               pathutil.c
                 Apparently, under QNX pathconf("/",_PC_PATH_MAX) returns
                 EINVAL. At Paul's suggestion I have modified the code to
                 silently substitute the existing MAX_PATHLEN_FALLBACK
                 value if pathconf() returns an error of any kind.
               homedir.c
                 Under QNX, sysconf(_SC_GETPW_R_SIZE_MAX) also apparently
                 returns EINVAL, so as with pathconf() I modified the code
                 to substitute a fallback default, rather than
                 complaining and failing.
               enhance.c
                 Paul told me that the inclusion of sys/termios.h was
                 causing compilation of enhance.c to fail under QNX. This
                 line is a bug.  The correct thing to do is include
                 termios.h without a sub-directory prefix, as I was
                 already doing futher up in the file, so I have just
                 removed the errant include line.

    07/05/2002 mcs@astro.caltech.edu  (async development branch only)
               getline.c
                 gl_read_character() now caches and reads unprocessed
                 characters from a key-press lookahead buffer. Whenever
                 gl_intepret_char() receives a new character which makes
                 an initially promising key-sequence no longer match the
                 prefix of any binding, it now simply discards the first
                 character from the key-press buffer and resets the buffer
                 pointer so that the next call to gl_read_character()
                 returns the character that followed it, from the buffer.
               getline.c
                 The part of gl_get_input_line() which preloads, displays
                 and prepares to edit a new input line, has now been moved
                 into a function called gl_present_line().

    12/02/2002 mcs@astro.caltech.edu
               getline.c configure.in configure
                 Mac OS X doesn't have a term.h or termcap.h, but it does
                 define prototypes for tputs() and setupterm(), so the
                 default prototypes that I was including if no headers
                 where available, upset it. I've removed these prototypes.
                 I also now conditionally include whichever is found of
                 curses.h and ncurses/curses.h for both termcap and
                 terminfo (before I wasn't including curses.h when
                 termcap was selected).

    12/02/2002 mcs@astro.caltech.edu
               Updated version number to 1.4.1, ready for a micro
               release.

    12/02/2002 mcs@astro.caltech.edu
               html/index.html
                 Added Mac OS X and Cygwin to the list of systems that
                 can compile libtecla.

    12/02/2002 mcs@astro.caltech.edu
               getline.c
                 Under Mac OS X, the tputs() callback function returns
                 void, instead of the int return value used by other
                 systems. This declaration is now used if both __MACH__
                 and __APPLE__ are defined. Hopefully these are the
                 correct system macros to check. Thanks for Stephan
                 Fiedler for providing information on Mac OS X.

    11/02/2002 mcs@astro.caltech.edu
               configure.in configure getline.c
                 Some systems don't have term.h, and others have it hidden
                 in an ncurses sub-directory of the standard system include
                 directory. If term.h can't be found, simply don't include
                 it. If it is in an ncurses sub-directory, include
                 ncurses/term.h instead of term.h.

    04/02/2002 mcs@astro.caltech.edu
               configure.in configure Makefile.in Makefile.rules
                 Use ranlib on systems that need it (Mac OS X).  Also,
                 make all components of the installation directories where
                 needed, instead of assuming that they exist.

    04/02/2002 mcs@astro.caltech.edu
               getline.c
                 When the tab completion binding was unbound from the tab
                 key, hitting the tab key caused gl_get_line() to ring the
                 bell instead of inserting a tab character. This is
                 problematic when using the 'enhance' program with
                 Jython, since tabs are important in Python. I have
                 corrected this.

    10/12/2001 Version 1.4.0 released.

    10/12/2001 mcs@astro.caltech.edu
               getline.c
                 If the TIOCGWINSZ ioctl doesn't work, as is the case when
                 running in an emacs shell, leave the size unchanged, rather
                 than returning a fatal error.

    07/12/2001 mcs@astro.caltech.edu
               configure.in configure
                 Now that the configure version of CFLAGS is included in
                 the makefile, I noticed that the optimization flags -g
                 and -O2 had been added. It turns out that if CFLAGS isn't
                 already set, the autoconf AC_PROG_CC macro initializes it
                 with these two optimization flags. Since this would break
                 backwards compatibility in embedded distributions that
                 already use the OPT= makefile argument, and because
                 turning debugging on needlessly bloats the library, I now
                 make sure that CFLAGS is set before calling this macro.

    07/12/2001 mcs@astro.caltech.edu
               enhance.c
                 Use argv[0] in error reports instead of using a
                 hardcoded macro.

    07/12/2001 mcs@astro.caltech.edu
               getline.c
                 The cut buffer wasn't being cleared after being
                 used as a work buffer by gl_load_history().

    06/12/2001 mcs@astro.caltech.edu
               configure.in configure
                 I removed my now redundant definition of SUN_TPUTS from
                 CFLAGS. I also added "-I/usr/include" to CFLAGS under
                 Solaris to prevent gcc from seeing conflicting versions
                 of system header files in /usr/local/include.

    06/12/2001 Markus Gyger (logged here by mcs)
               Lots of files.
                 Lots of corrections to misspellings and typos in the
                 comments.
               getline.c
                 Markus reverted a supposed fix that I added a day or two
                 ago. I had incorrectly thought that in Solaris 8, Sun had
                 finally brought their declaration of the callback
                 function of tputs() into line with other systems, but it
                 turned out that gcc was pulling in a GNU version of
                 term.h from /usr/local/include, and this was what
                 confused me.

    05/12/2001 mcs@astro.caltech.edu
               Makefile.in
                 I added @CFLAGS@ to the CFLAGS assignment, so that
                 if CFLAGS is set as an environment variable when
                 configure is run, the corresponding make variable
                 includes its values in the output makefile.

    05/12/2001 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man3/gl_get_line.3
               man3/gl_last_signal.3
                 I added a function that programs can use to find out
                 which signal caused gl_get_line() to return EINTR.

    05/12/2001 mcs@astro.caltech.edu
               getline.c
                 When the newline action was triggered by a printable
                 character, it failed to display that character. It now
                 does. Also, extra control codes that I had added, to
                 clear to the end of the display after the carriage return,
                 but before displaying the prompt, were confusing expect
                 scripts, so I have removed them. This step is now done
                 instead in gl_redisplay() after displaying the full input
                 line.

    05/12/2001 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 A user convinced me that continuing to invoke meta
                 keybindings for meta characters that are printable is a
                 bad idea, as is allowing users to ask to have setlocale()
                 called behind the application's back. I have thus changed
                 this. The setlocale configuration option has gone, and
                 gl_get_line() is now completely 8-bit clean, by default.
                 This means that if a meta character is printable, it is
                 treated as a literal character, rather than a potential
                 M-c binding.  Meta bindings can still be invoked via
                 their Esc-c equivalents, and indeed most terminal
                 emulators either output such escape pairs by default when
                 the meta character is pressed, or can be configured to do
                 so. I have documented how to configure xterm to do this,
                 in the man page.

    03/12/2001 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 gl_get_line() by default now prints any 8-bit printable
                 characters that don't match keybindings. Previously
                 characters > 127 were only printed if preceded by the
                 literal-next action.  Alternatively, by placing the
                 command literal_if_printable in the tecla configuration
                 file, all printable characters are treated as literal
                 characters, even if they are bound to action functions.

                 For international users of programs written by
                 programmers that weren't aware of the need to call
                 setlocale() to support alternate character sets, the
                 configuration file can now also contain the single-word
                 command "setlocale", which tells gl_get_line() to remedy
                 this.

    27/11/2001 mcs@astro.caltech.edu
               demo.c demo2.c enhance man3/gl_get_line.3
                 All demos and programs now call setlocale(LC_CTYPE,"").
                 This makes them support character sets of different
                 locales, where specified with the LC_CTYPE, LC_ALL, or
                 LANG environment variables. I also added this to the demo
                 in the man page, and documented its effect.

    27/11/2001 mcs@astro.caltech.edu
               getline.c
                 When displaying unsigned characters with values over
                 127 literally, previously it was assumed that they would
                 all be displayable. Now isprint() is consulted, and if it
                 says that a character isn't printable, the character code
                 is displayed in octal like \307. In non-C locales, some
                 characters with values > 127 are displayable, and
                 isprint() tells gl_get_line() which are and which aren't.

    27/11/2001 mcs@astro.caltech.edu
               getline.c pathutil.c history.c enhance.c demo2.c
                 All arguments of the ctype.h character class functions
                 are now cast to (int)(unsigned char). Previously they
                 were cast to (int), which doesn't correctly conform to
                 the requirements of the C standard, and could cause
                 problems for characters with values > 127 on systems
                 with signed char's.

    26/11/2001 mcs@astro.caltech.edu
               man3/enhance.3 man3/libtecla.3
                 I started writing a man page for the enhance program.

    26/11/2001 mcs@astro.caltech.edu
               Makefile.in Makefile.rules INSTALL
                 It is now possible to specify whether the demos and other
                 programs are to be built, by overriding the default
                 values of the DEMOS, PROGRAMS and PROGRAMS_R variables.
                 I have also documented the BINDIR variable and the
                 install_bin makefile target.

    22/11/2001 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man3/gl_get_line.3
               man3/gl_ignore_signal.3 man3/gl_trap_signal.3
                 Signal handling has now been modified to be customizable.
                 Signals that are trapped by default can be removed from
                 the list of trapped signals, and signals that aren't
                 currently trapped, can be added to the list. Applications
                 can also specify the signal and terminal environments in
                 which an application's signal handler is invoked, and
                 what gl_get_line() does after the signal handler returns.

    13/11/2001 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 Added half-bright, reverse-video and blinking text to the
                 available prompt formatting options.
               getline.c
                 Removed ^O from the default VT100 sgr0 capability
                 string.  Apparently it can cause problems with some
                 terminal emulators, and we don't need it, since it turns
                 off the alternative character set mode, which we don't
                 use.
               getline.c
                 gl_tigetstr() and gl_tgetstr() didn't guard against the
                 error returns of tigetstr() and tgetstr() respectively.
                 They now do.

    11/11/2001 mcs@astro.caltech.edu
               getline.c libtecla.h libtecla.map man3/gl_get_line.3
               man3/gl_prompt_style.3
                 Although the default remains to display the prompt string
                 literally, the new gl_prompt_style() function can be used
                 to enable text attribute formatting directives in prompt
                 strings, such as underlining, bold font, and highlighting
                 directives.

    09/11/2001 mcs@astro.caltech.edu
               enhance.c Makefile.rules configure.in configure
                 I added a new program to the distribution that allows one
                 to run most third party programs with the tecla library
                 providing command-line editing.

    08/11/2001 mcs@astro.caltech.edu
               libtecla.h getline.c man3/gl_get_line.3 history.c history.h
                 I added a max_lines argument to gl_show_history() and
                 _glh_show_history(). This can optionally be used to
                 set a limit on the number of history lines displayed.
               libtecla.h getline.c man3/gl_get_line.3
                 I added a new function called gl_replace_prompt(). This
                 can be used by gl_get_line() callback functions to
                 request that a new prompt be use when they return.

    06/11/2001 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 I implemented, bound and documented the list-history
                 action, used for listing historical lines of the current
                 history group.
               getline.c man3/gl_get_line.3 man3/gl_echo_mode.3
                 I wrote functions to specify and query whether subsequent
                 lines will be visible as they are being typed.

    28/10/2001 mcs@astro.caltech.edu
               getline.c man3/gl_get_line.3
                 For those cases where a terminal provides its own
                 high-level terminal editing facilities, you can now
                 specify an edit-mode argument of 'none'. This disables
                 all tecla key bindings, and by using canonical terminal
                 input mode instead of raw input mode, editing is left up
                 to the terminal driver.

    21/10/2001 mcs@astro.caltech.edu
               libtecla.h getline.c history.c history.h
               man3/gl_get_line.3 man3/gl_history_info.3
                 I added the new gl_state_of_history(),
                 gl_range_of_history() and gl_size_of_history()
                 functions for querying information about the
                 history list.
               history.c
                 While testing the new gl_size_of_history()
                 function, I noticed that when the history buffer
                 wrapped, any location nodes of old lines between
                 the most recent line and the end of the buffer
                 weren't being removed. This could result in bogus
                 entries appearing at the start of the history list.
                 Now fixed.

    20/10/2001 mcs@astro.caltech.edu

               libtecla.h getline.c history.c history.h
               man3/gl_get_line.3 man3/gl_lookup_history.3
                 I added a function called gl_lookup_history(), that
                 the application can use to lookup lines in the history
                 list.
               libtecla.h getline.c history.c history.h man3/gl_get_line.3
                 gl_show_history() now takes a format string argument
                 to control how the line is displayed, and with what
                 information. It also now provides the option of either
                 displaying all history lines or just those of the
                 current history group.
               getline.c man3/gl_get_line.3
                 gl_get_line() only archives lines in the history buffer
                 if the newline action was invoked by a newline or
                 carriage return character.

    16/10/2001 mcs@astro.caltech.edu

               history.c history.h getline.c libtecla.h libtecla.map
               man3/gl_get_line.3 man3/gl_resize_history.3
               man3/gl_limit_history.3 man3/gl_clear_history.3
               man3/gl_toggle_history.3
    	     I added a number of miscellaneous history configuration
    	     functions. You can now resize or delete the history
    	     buffer, limit the number of lines that are allowed in the
    	     buffer, clear either all history or just the history of
    	     the current history group, and temporarily enable and
    	     disable the history mechanism.

    13/10/2001 mcs@astro.caltech.edu

               getline.c
                 tputs_fp is now only declared if using termcap or
                 terminfo.
               getline.c libtecla.map man3/gl_get_line.3
               man3/gl_terminal_size.3
                 I added a public gl_terminal_size() function for
                 updating and querying the current size of the terminal.
               update_version configure.in libtecla.h
                 A user noted that on systems where the configure script
                 couldn't be used, it was inconvenient to have the version
                 number macros set by the configure script, so they are
                 now specified in libtecla.h. To reduce the likelihood
                 that the various files where the version number now
                 appears might get out of sync, I have written the
                 update_version script, which changes the version number
                 in all of these files to a given value.

    01/10/2001 mcs@astro.caltech.edu

               getline.c history.c history.h man3/gl_get_line.3
                 I added a max_lines argument to gl_save_history(), to
                 allow people to optionally place a ceiling on the number
                 of history lines saved. Specifying this as -1 sets the
                 ceiling to infinity.

    01/10/2001 mcs@astro.caltech.edu

               configure.in configure
                 Under digital unix, getline wouldn't compile with
                 _POSIX_C_SOURCE set, due to type definitions needed by
                 select being excluded by this flag. Defining the
                 _OSF_SOURCE macro as well on this system, resolved this.

    30/09/2001 mcs@astro.caltech.edu

               getline.c libtecla.h history.c history.h man3/gl_get_line.3
               man3/gl_group_history.3
                 I implemented history streams. History streams
                 effectively allow multiple history lists to be stored in
                 a single history buffer. Lines in the buffer are tagged
                 with the current stream identification number, and
                 lookups only consider lines that are marked with the
                 current stream identifier.
               getline.c libtecla.h history.c history.h man3/gl_get_line.3
               man3/gl_show_history.3
                 The new gl_show_history function displays the current
                 history to a given stdio output stream.

    29/09/2001 mcs@astro.caltech.edu

               getline.c
                 Previously new_GetLine() installed a persistent signal
                 handler to be sure to catch the SIGWINCH (terminal size
                 change) signal between calls to gl_get_line(). This had
                 the drawback that if multiple GetLine objects were
                 created, only the first GetLine object used after the
                 signal was received, would see the signal and adapt to
                 the new terminal size. Instead of this, a signal handler
                 for sigwinch is only installed while gl_get_line() is
                 running, and just after installing this handler,
                 gl_get_line() checks for terminal size changes that
                 might have occurred while the signal handler wasn't
                 installed.
               getline.c
                 Dynamically allocated copies of capability strings looked
                 up in the terminfo or termcap databases are now made, so
                 that calls to setupterm() etc for one GetLine object
                 don't get trashed when another GetLine object calls
                 setupterm() etc. It is now safe to allocate and use
                 multiple GetLine objects, albeit only within a single
                 thread.

    28/09/2001 mcs@astro.caltech.edu

               version.c Makefile.rules
                 I added a function for querying the version number of
                 the library.

    26/09/2001 mcs@astro.caltech.edu

               getline.c man3/gl_get_line.3
                 I added the new gl_watch_fd() function, which allows
                 applications to register callback functions to be invoked
                 when activity is seen on arbitrary file descriptors while
                 gl_get_line() is awaiting keyboard input from the user.

               keytab.c
                 If a request is received to delete a non-existent
                 binding, which happens to be an ambiguous prefix of other
                 bindings no complaint is now generated about it being
                 ambiguous.

    23/09/2001 mcs@astro.caltech.edu

               getline.c history.c history.h man3/gl_get_line.3
               libtecla.map demo.c
                 I added new public functions for saving and restoring the
                 contents of the history list. The demo program now uses
                 these functions to load and save history in ~/.demo_history.

    23/09/2001 mcs@astro.caltech.edu

               getline.c
                 On trying the demo for the first time on a KDE konsole
                 terminal, I discovered that the default M-O binding
                 to repeat history was hiding the arrow keys, which are
                 M-OA etc. I have removed this binding. The M-o (ie the
                 lower case version of this), is still bound.

    18/09/2001 mcs@astro.caltech.edu

               getline.c man3/gl_get_line.3 libtecla.map
                 Automatic reading of ~/.teclarc is now postponed until
                 the first call to gl_get_line(), to give the application
                 the chance to specify alternative configuration sources
                 with the new function gl_configure_getline(). The latter
                 function allows configuration to be done with a string, a
                 specified application-specific file, and/or a specified
                 user-specific file. I also added a read-init-files action
                 function, for re-reading the configuration files, if any.
                 This is by default bound to ^X^R. This is all documented
                 in gl_get_line.3.

    08/09/2001 mcs@astro.caltech.edu

               getline.c man3/gl_get_line.3
                 It is now possible to bind actions to key-sequences
                 that start with printable characters. Previously
                 keysequences were required to start with meta or control
                 characters. This is documented in gl_get_line.3.

               getline.c man3/gl_get_line.3
                 A customized completion function can now arrange for
                 gl_get_line() to return the current input line whenever a
                 successful completion has been made. This is signalled by
                 setting the last character of the optional continuation
                 suffix to a newline character. This is documented in
                 gl_get_line.3.

    05/07/2001 Bug reported by Mike MacFaden, fixed by mcs

               configure.in
                 There was a bug in the configure script that only
                 revealed itself on systems without termcap but not
                 terminfo (eg. NetBSD). I traced the bug back to a lack of
                 sufficient quoting of multi-line m4 macro arguments in
                 configure.in, and have now fixed this and recreated the
                 configure script.

    05/07/2001 Bug reported and patched by Mike MacFaden (patch modified
               by mcs to match original intentions).

               getline.c
                 getline.c wouldn't compile when termcap was selected as
                 the terminal information database. setupterm() was being
                 passed a non-existent variable, in place of the term[]
                 argument of gl_control_strings(). Also if
                 gl_change_terminal() is called with term==NULL, "ansi"
                 is now substituted.

    02/07/2001 Version 1.3.3 released.

    27/06/2001 mcs@astro.caltech.edu

               getline.c expand.c cplmatch.c
                 Added checks to fprintf() statements that write to the
                 terminal.
               getline.c
                 Move the cursor to the end of the line before suspending,
                 so that the cursor doesn't get left in the middle of the
                 input line.
               Makefile.in
                 On systems that don't support shared libraries, the
                 distclean target of make deleted libtecla.h. This has
                 now been fixed.
               getline.c
                 gl_change_terminal() was being called by gl_change_editor(),
                 with the unwanted side effect that raw terminal modes were
                 stored as those to be restored later, if called by an
                 action function. gl_change_terminal() was being called in
                 this case to re-establish terminal-specific key bindings,
                 so I have just split this part of the function out into
                 a separate function for both gl_change_editor() and
                 gl_change_terminal() to call.

    12/06/2001 mcs@astro.caltech.edu

               getline.c
                 Signal handling has been improved. Many more signals are
                 now trapped, and instead of using a simple flag set by a
                 signal handler, race conditions are avoided by blocking
                 signals during most of the gl_get_line() code, and
                 unblocking them via calls to sigsetjmp(), just before
                 attempting to read each new character from the user.
                 The matching use of siglongjmp() in the signal
                 handlers ensures that signals are reblocked correctly
                 before they are handled. In most cases, signals cause
                 gl_get_line() to restore the terminal modes and signal
                 handlers of the calling application, then resend the
                 signal to the application. In the case of SIGINT, SIGHUP,
                 SIGPIPE, and SIGQUIT, if the process still exists after
                 the signals are resent, gl_get_line() immediately returns
                 with appropriate values assigned to errno. If SIGTSTP,
                 SIGTTIN or SIGTTOU signals are received, the process is
                 suspended. If any other signal is received, and the
                 process continues to exist after the signal is resent to
                 the calling application, line input is resumed after the
                 terminal is put back into raw mode, the gl_get_line()
                 signal handling is restored, and the input line redrawn.
               man/gl_get_line(3)
                 I added a SIGNAL HANDLING section to the gl_get_line()
                 man page, describing the new signal handling features.

    21/05/2001 Version 1.3.2 released.

    21/05/2001 mcs@astro.caltech.edu

               getline.c
                 When vi-replace-char was used to replace the character at
                 the end of the line, it left the cursor one character to
                 its right instead of on top of it. Now rememdied.
               getline.c
                 When undoing, to properly emulate vi, the cursor is now
                 left at the leftmost of the saved and current cursor
                 positions.
               getline.c man3/gl_get_line.3
                 Implemented find-parenthesis (%), delete-to-paren (M-d%),
                 vi-change-to-paren (M-c%), copy-to-paren (M-y%).
               cplfile.c pcache.c
                 In three places I was comparing the last argument of
                 strncmp() to zero instead of the return value of
                 strncmp().

    20/05/2001 mcs@astro.caltech.edu

               getline.c man3/gl_get_line.3
                 Implemented and documented the vi-repeat-change action,
                 bound to the period key. This repeats the last action
                 that modified the input line.

    19/05/2001 mcs@astro.caltech.edu

               man3/gl_get_line.3
                 I documented the new action functions and bindings
                 provided by Tim Eliseo, plus the ring-bell action and
                 the new "nobeep" configuration option.
               getline.c
                 I modified gl_change_editor() to remove and reinstate the
                 terminal settings as well as the default bindings, since
                 these have editor-specific differences. I also modified
                 it to not abort if a key-sequence can't be bound for some
                 reason. This allows the new vi-mode and emacs-mode
                 bindings to be used safely.
               getline.c
                 When the line was re-displayed on receipt of a SIGWINCH
                 signal, the result wasn't visible until the next
                 character was typed, since a call to fflush() was needed.
                 gl_redisplay_line() now calls gl_flush_output() to remedy
                 this.

    17/05/2001 mcs@astro.catlech.edu

               getline.c
                 Under Linux, calling fflush(gl->output_fd) hangs if
                 terminal output has been suspended with ^S. With the
                 tecla library taking responsability for reading the stop
                 and start characters this was a problem, because once
                 hung in fflush(), the keyboard input loop wasn't entered,
                 so the user couldn't type the start character to resume
                 output.  To remedy this, I now have the terminal process
                 these characters, rather than the library.

    12/05/2001 mcs@astro.caltech.edu

               getline.c
                 The literal-next action is now implemented as a single
                 function which reads the next character itself.
                 Previously it just set a flag which effected the
                 interpretation of the next character read by the input
                 loop.
               getline.c
                 Added a ring-bell action function. This is currently
                 unbound to any key by default, but it is used internally,
                 and can be used by users that want to disable any of the
                 default key-bindings.

    12/05/2001 Tim Eliseo    (logged here by mcs)

               getline.c
                 Don't reset gl->number until after calling an action
                 function. By looking at whether gl->number is <0 or
                 not, action functions can then tell whether the count
                 that they were passed was explicitly specified by the
                 user, as opposed to being defaulted to 1.
               getline.c
                 In vi, the position at which input mode is entered
                 acts as a barrier to backward motion for the few
                 backward moving actions that are enabled in input mode.
                 Tim added this barrier to getline.
               getline.c
                 In gl_get_line() after reading an input line, or
                 having the read aborted by a signal, the sig_atomic_t
                 gl_pending_signal was being compared to zero instead
                 of -1 to see if no signals had been received.
                 gl_get_line() will thus have been calling raise(-1),
                 which luckily didn't seem to do anything. Tim also
                 arranged for errno to be set to EINTR when a signal
                 aborts gl_get_line().
               getline.c
                 The test in gl_add_char_to_line() for detecting
                 when overwriting a character with a wider character,
                 had a < where it needed a >. Overwriting with a wider
                 character thus overwrote trailing characters. Tim also
                 removed a redundant copy of the character into the
                 line buffer.
               getline.c
                 gl_cursor_left() and gl->cursor_right() were executing
                 a lot of redundant code, when the existing call to the
                 recently added gl_place_cursor() function, does all that
                 is necessary.
               getline.c
                 Remove redundant code from backward_kill_line() by
                 re-implimenting in terms of gl_place_cursor() and
                 gl_delete_chars().
               getline.c
                 gl_forward_delete_char() now records characters in cut
                 buffer when in vi command mode.
               getline.c
                 In vi mode gl_backward_delete_char() now only deletes
                 up to the point at which input mode was entered. Also
                 gl_delete_chars() restores from the undo buffer when
                 deleting in vi insert mode.
               getline.c
                 Added action functions, vi-delete-goto-column,
                 vi-change-to-bol, vi-change-line, emacs-mode, vi-mode,
                 vi-forward-change-find, vi-backward-change-find,
                 vi-forward-change-to, vi-backward-change-to,
                 vi-change-goto-col, forward-delete-find, backward-delete-find,
                 forward-delete-to, backward-delete-to,
                 delete-refind, delete-invert-refind, forward-copy-find,
                 backward-copy-find, forward-copy-to, backward-copy-to
                 copy-goto-column, copy-rest-of-line, copy-to-bol, copy-line,
                 history-re-search-forward, history-re-search-backward.

    06/05/2001 Version 1.3.1 released.

    03/05/2001 mcs@astro.caltech.edu

               configure.in
                 Old versions of GNU ld don't accept version scripts.
                 Under Linux I thus added a test to try out ld with
                 the --version-script argument to see if it works.
                 If not, version scripts aren't used.
               configure.in
                 My test for versions of Solaris earlier than 7
                 failed when confronted by a three figure version
                 number (2.5.1). Fixed.

    30/04/2001 mcs@astro.caltech.edu

               getline.c
                 In vi mode, history-search-backward and
                 history-search-forward weren't doing anything when
                 invoked at the start of an empty line, whereas
                 they should have acted like up-history and down-history.
               Makefile.in Makefile.rules
                 When shared libraries are being created, the build
                 procedure now arranges for any alternate library
                 links to be created as well, before linking the
                 demos. Without this the demos always linked to the
                 static libraries (which was perfectly ok, but wasn't a
                 good example).
               Makefile.in Makefile.rules
                 On systems on which shared libraries were being created,
                 if there were no alternate list of names, make would
                 abort due to a Bourne shell 'for' statement that didn't
                 have any arguments. Currently there are no systems who's
                 shared library configurations would trigger this
                 problem.
               Makefile.rules
                 The demos now relink to take account of changes to the
                 library.
               configure.in configure
                 When determining whether the reentrant version of the
                 library should be compiled by default, the configure
                 script now attempts to compile a dummy program that
                 includes all of the appropriate system headers and
                 defines _POSIX_C_SOURCE. This should now be a robust test
                 on systems which use C macros to alias these function
                 names to other internal functions.
               configure.in
                 Under Solaris 2.6 and earlier, the curses library is in
                 /usr/ccs/lib. Gcc wasn't finding this. In addition to
                 remedying this, I had to remove "-z text" from
                 LINK_SHARED under Solaris to get it to successfully
                 compile the shared library against the static curses
                 library.
               configure.in
                 Under Linux the -soname directive was being used
                 incorrectly, citing the fully qualified name of the
                 library instead of its major version alias. This will
                 unfortunately mean that binaries linked with the 1.2.3
                 and 1.2.4 versions of the shared library won't use
                 later versions of the library unless relinked.

    30/04/2001 mcs@astro.caltech.edu

               getline.c
                 In gl_get_input_line(), don't redundantly copy the
                 start_line if start_line == gl->line.

    30/04/2001 Version 1.3.0 released.

    28/04/2001 mcs@astro.caltech.edu

               configure.in
                 I removed the --no-undefined directive from the Linux
                 LINK_SHARED command. After recent patches to our RedHat
                 7.0 systems ld started reporting some internal symbols of
                 libc as being undefined.  Using nm on libc indicated that
                 the offending symbols are indeed defined, albeit as
                 "common" symbols, so there appears to be a bug in
                 RedHat's ld. Removing this flag allows the tecla shared
                 library to compile, and programs appear to function fine.
               man3/gl_get_line.3
                 The default key-sequence used to invoke the
                 read-from-file action was incorrectly cited as ^Xi
                 instead of ^X^F.

    26/04/2001 mcs@astro.caltech.edu

               getline.c man3/gl_get_line.3
                 A new vi-style editing mode was added. This involved
                 adding many new action functions, adding support for
                 specifying editing modes in users' ~/.teclarc files,
                 writing a higher level cursor motion function to support
                 the different line-end bounds required in vi command
                 mode, and a few small changes to support the fact that vi
                 has two modes, input mode and command mode with different
                 bindings.

                 When vi editing mode is enabled, any binding that starts
                 with an escape or a meta character, is interpreted as a
                 command-mode binding, and switches the library to vi
                 command mode if not already in that mode. Once in command
                 mode the first character of all keysequences entered
                 until input mode is re-enabled, are quietly coerced to
                 meta characters before being looked up in the key-binding
                 table. So, for example, in the key-binding table, the
                 standard vi command-mode 'w' key, which moves the cursor
                 one word to the right, is represented by M-w. This
                 emulates vi's dual sets of bindings in a natural way
                 without needing large changes to the library, or new
                 binding syntaxes. Since cursor keys normally emit
                 keysequences which start with escape, it also does
                 something sensible when a cursor key is pressed during
                 input mode (unlike true vi, which gets upset).

                 I also added a ^Xg binding for the new list-glob action
                 to both the emacs and vi key-binding tables. This lists
                 the files that match the wild-card expression that
                 precedes it on the command line.

                 The function that reads in ~/.teclarc used to tell
                 new_GetLine() to abort if it encountered anything that it
                 didn't understand in this file. It now just reports an
                 error and continues onto the next line.
               Makefile.in:
                 When passing LIBS=$(LIBS) to recursive invokations of
                 make, quotes weren't included around the $(LIBS) part.
                 This would cause problems if LIBS ever contained more
                 than one word (with the supplied configure script this
                 doesn't happen currently). I added these quotes.
               expand.c man3/ef_expand_file.3:
                 I wrote a new public function called ef_list_expansions(),
                 to list the matching filenames returned by
                 ef_expand_file().

                 I also fixed the example in the man page, which cited
                 exp->file instead of exp->files, and changed the
                 dangerous name 'exp' with 'expn'.
               keytab.c:
                 Key-binding tables start with 100 elements, and are
                 supposedly incremented in size by 100 elements whenever
                 the a table runs out of space. The realloc arguments to
                 do this were wrong. This would have caused problems if
                 anybody added a lot of personal bindings in their
                 ~/.teclarc file. I only noticed it because the number of
                 key bindings needed by the new vi mode exceeded this
                 number.
               libtecla.map
                 ef_expand_file() is now reported as having been added in
                 the upcoming 1.3.0 release.

    25/03/2001 Markus Gyger  (logged here by mcs)

               Makefile.in:
                 Make symbolic links to alternative shared library names
                 relative instead of absolute.
               Makefile.rules:
                 The HP-UX libtecla.map.opt file should be made in the
                 compilation directory, to allow the source code directory
                 to be on a readonly filesystem.
               cplmatch.c demo2.c history.c pcache.c
                 To allow the library to be compiled with a C++ compiler,
                 without generating warnings, a few casts were added where
                 void* return values were being assigned directly to
                 none void* pointer variables.

    25/03/2001 mcs@astro.caltech.edu

               libtecla.map:
                 Added comment header to explain the purpose of the file.
                 Also added cpl_init_FileArgs to the list of exported
                 symbols. This symbol is deprecated, and no longer
                 documented, but for backwards compatibility, it should
                 still be exported.
               configure:
                 I had forgotten to run autoconf before releasing version
                 1.2.4, so I have just belatedly done so.  This enables
                 Markus' changes to "configure.in" documented previously,
                 (see 17/03/2001).

    20/03/2001 John Levon   (logged here by mcs)

               libtecla.h
                 A couple of the function prototypes in libtecla.h have
                 (FILE *) argument declarations, which means that stdio.h
                 needs to be included. The header file should be self
                 contained, so libtecla.h now includes stdio.h.

    18/03/2001 Version 1.2.4 released.

               README html/index.html configure.in
                 Incremented minor version from 3 to 4.

    18/03/2001 mcs@astro.caltech.edu

               getline.c
                 The fix for the end-of-line problem that I released a
                 couple of weeks ago, only worked for the first line,
                 because I was handling this case when the cursor position
                 was equal to the last column, rather than when the cursor
                 position modulo ncolumn was zero.
               Makefile.in Makefile.rules
                 The demos are now made by default, their rules now being
                 int Makefile.rules instead of Makefile.in.
               INSTALL
                 I documented how to compile the library in a different
                 directory than the distribution directory.
                 I also documented features designed to facilitate
                 configuring and building the library as part of another
                 package.

    17/03/2001 Markus Gyger (logged here by mcs)

               getline.c
                 Until now cursor motions were done one at a time. Markus
                 has added code to make use the of the terminfo capability
                 that moves the cursor by more than one position at a
                 time. This greatly improves performance when editing near
                 the start of long lines.
               getline.c
                 To further improve performance, Markus switched from
                 writing one character at a time to the terminal, using
                 the write() system call, to using C buffered output
                 streams. The output buffer is only flushed when
                 necessary.
               Makefile.rules Makefile.in configure.in
                 Added support for compiling for different architectures
                 in different directories. Simply create another directory
                 and run the configure script located in the original
                 directory.
               Makefile.in configure.in libtecla.map
                 Under Solaris, Linux and HP-UX, symbols that are to be
                 exported by tecla shared libraries are explicitly specified
                 via symbol map files. Only publicly documented functions
                 are thus visible to applications.
               configure.in
                 When linking shared libraries under Solaris SPARC,
                 registers that are reserved for applications are marked
                 as off limits to the library, using -xregs=no%appl when
                 compiling with Sun cc, or -mno-app-regs when compiling
                 with gcc. Also removed -z redlocsym for Solaris, which
                 caused problems under some releases of ld.
               homedir.c  (after minor changes by mcs)
                 Under ksh, ~+ expands to the current value of the ksh
                 PWD environment variable, which contains the path of
                 the current working directory, including any symbolic
                 links that were traversed to get there. The special
                 username "+" is now treated equally by tecla, except
                 that it substitutes the return value of getcwd() if PWD
                 either isn't set, or if it points at a different
                 directory than that reported by getcwd().

    08/03/2001 Version 1.2.3 released.

    08/03/2001 mcs@astro.caltech.edu

               getline.c
                 On compiling the library under HP-UX for the first time
                 I encountered and fixed a couple of bugs:

                 1. On all systems except Solaris, the callback function
                    required by tputs() takes an int argument for the
                    character that is to be printed. Under Solaris it
                    takes a char argument. The callback function was
                    passing this argument, regardless of type, to write(),
                    which wrote the first byte of the argument.  This was
                    fine under Solaris and under little-endian systems,
                    because the first byte contained the character to be
                    written, but on big-endian systems, it always wrote
                    the zero byte at the other end of the word. As a
                    result, no control characters were being written to
                    the terminal.
                 2. While attempting to start a newline after the user hit
                    enter, the library was outputting the control sequence
                    for moving the cursor down, instead of the newline
                    character. On many systems the control sequence for
                    moving the cursor down happends to be a newline
                    character, but under HP-UX it isn't. The result was
                    that no new line was being started under HP-UX.

    04/03/2001 mcs@astro.caltech.edu

               configure.in Makefile.in Makefile.stub configure config.guess
               config.sub Makefile.rules install-sh PORTING README INSTALL
                 Configuration and compilation of the library is now
                 performed with the help of an autoconf configure
                 script. In addition to relieving the user of the need to
                 edit the Makefile, this also allows automatic compilation
                 of the reentrant version of the library on platforms that
                 can handle it, along with the creation of shared
                 libraries where configured. On systems that aren't known
                 to the configure script, just the static tecla library is
                 compiled. This is currently the case on all systems
                 except Linux, Solaris and HP-UX. In the hope that
                 installers will provide specific conigurations for other
                 systems, the configure.in script is heavily commented,
                 and instructions on how to use are included in a new
                 PORTING file.

    24/02/2001 Version 1.2b released.

    22/02/2001 mcs@astro.caltech.edu

               getline.c
                 It turns out that most terminals, but not all, on writing
                 a character in the rightmost column, don't wrap the
                 cursor onto the next line until the next character is
                 output. This library wasn't aware of this and thus if one
                 tried to reposition the cursor from the last column,
                 gl_get_line() thought that it was moving relative to a
                 point on the next line, and thus moved the cursor up a
                 line. The fix was to write one extra character when in
                 the last column to force the cursor onto the next line,
                 then backup the cursor to the start of the new line.
               getline.c
                 On terminal initialization, the dynamic LINES and COLUMNS
                 environment variables were ignored unless
                 terminfo/termcap didn't return sensible dimensions. In
                 practice, when present they should override the static
                 versions in the terminfo/termcap databases. This is the
                 new behavior. In reality this probably won't have caused
                 many problems, because a SIGWINCH signal which informs of
                 terminal size changes is sent when the terminal is
                 opened, so the dimensions established during
                 initialization quickly get updated on most systems.

    18/02/2001 Version 1.2a released.

    18/02/2001 mcs@astro.caltech.edu

               getline.c
                 Three months ago I moved the point at which termios.h
                 was included in getline.c. Unfortunately, I didn't notice
                 that this moved it to after the test for TIOCGWINSZ being
                 defined. This resulted in SIGWINCH signals not being
                 trapped for, and thus terminal size changes went
                 unnoticed. I have now moved the test to after the
                 inclusion of termios.h.

    12/02/2001 Markus Gyger     (described here by mcs)

               man3/pca_lookup_file.3 man3/gl_get_line.3
               man3/ef_expand_file.3 man3/cpl_complete_word.3
                 In the 1.2 release of the library, all functions in the
                 library were given man pages. Most of these simply
                 include one of the above 4 man pages, which describe the
                 functions while describing the modules that they are in.
                 Markus added all of these function names to the lists in
                 the "NAME" headers of the respective man pages.
                 Previously only the primary function of each module was
                 named there.

    11/02/2001 mcs@astro.caltech.edu

               getline.c
                 On entering a line that wrapped over two or more
                 terminal, if the user pressed enter when the cursor
                 wasn't on the last of the wrapped lines, the text of the
                 wrapped lines that followed it got mixed up with the next
                 line written by the application, or the next input
                 line. Somehow this slipped through the cracks and wasn't
                 noticed until now. Anyway, it is fixed now.

    09/02/2001 Version 1.2 released.

    04/02/2001 mcs@astro.caltech.edu

               pcache.c libtecla.h
                 With all filesystems local, demo2 was very fast to start
                 up, but on a Sun system with one of the target
                 directories being on a remote nfs mounted filesystem, the
                 startup time was many seconds. This was due to the
                 executable selection callback being applied to all files
                 in the path at startup. To avoid this, all files are now
                 included in the cache, and the application specified
                 file-selection callback is only called on files as they
                 are matched. Whether the callback rejected or accepted
                 them is then cached so that the next time an already
                 checked file is looked at, the callback doesn't have to
                 be called. As a result, startup is now fast on all
                 systems, and since usually there are only a few matching
                 file completions at a time, the delay during completion
                 is also usually small. The only exception is if the user
                 tries to complete an empty string, at which point all
                 files have to be checked. Having done this once, however,
                 doing it again is fast.
               man3/pca_lookup_file.3
                 I added a man page documenting the new PathCache module.
               man3/<many-new-files>.3
                 I have added man pages for all of the functions in each
                 of the modules. These 1-line pages use the .so directive
                 to redirect nroff to the man page of the parent module.
               man Makefile update_html
                 I renamed man to man3 to make it easier to test man page
                 rediction, and updated Makefile and update_html
                 accordingly. I also instructed update_html to ignore
                 1-line man pages when making html equivalents of the man
                 pages.
               cplmatch.c
                 In cpl_list_completions() the size_t return value of
                 strlen() was being used as the length argument of a "%*s"
                 printf directive. This ought to be an int, so the return
                 value of strlen() is now cast to int. This would have
                 caused problems on architectures where the size of a
                 size_t is not equal to the size of an int.

    02/02/2001 mcs@astro.caltech.edu

               getline.c
                 Under UNIX, certain terminal bindings are set using the
                 stty command. This, for example, specifies which control
                 key generates a user-interrupt (usually ^C or ^Y). What I
                 hadn't realized was that ASCII NUL is used as the way to
                 specify that one of these bindings is unset. I have now
                 modified the code to skip unset bindings, leaving the
                 corresponding action bound to the built-in default, or a
                 user provided binding.

    28/01/2001 mcs@astro.caltech.edu

               pcache.c libtecla.h
                 A new module was added which supports searching for files
                 in any colon separated list of directories, such as the
                 unix execution PATH environment variable. Files in these
                 directories, after being individually okayed for
                 inclusion via an application provided callback, are
                 cached in a PathCache object. You can then look up the
                 full pathname of a given filename, or you can use the
                 provided completion callback to list possible completions
                 in the path-list. The contents of relative directories,
                 such as ".", obviously can't be cached, so these
                 directories are read on the fly during lookups and
                 completions. The obvious application of this facility is
                 to provide Tab-completion of commands, and thus a
                 callback to place executable files in the cache, is
                 provided.
               demo2.c
                 This new program demonstrates the new PathCache
                 module. It reads and processes lines of input until the
                 word 'exit' is entered, or C-d is pressed. The default
                 tab-completion callback is replaced with one which at the
                 start of a line, looks up completions of commands in the
                 user's execution path, and when invoked in other parts of
                 the line, reverts to normal filename completion. Whenever
                 a new line is entered, it extracts the first word on the
                 line, looks it up in the user's execution path to see if
                 it corresponds to a known command file, and if so,
                 displays the full pathname of the file, along with the
                 remaining arguments.
               cplfile.c
                 I added an optional pair of callback function/data
                 members to the new cpl_file_completions() configuration
                 structure. Where provided, this callback is asked
                 on a file-by-file basis, which files should be included
                 in the list of file completions. For example, a callback
                 is provided for listing only completions of executable
                 files.
               cplmatch.c
                 When listing completions, the length of the type suffix
                 of each completion wasn't being taken into account
                 correctly when computing the column widths. Thus the
                 listing appeared ragged sometimes. This is now fixed.
               pathutil.c
                 I added a function for prepending a string to a path,
                 and another for testing whether a pathname referred to
                 an executable file.

    28/01/2001 mcs@astro.caltech.edu

               libtecla.h cplmatch.c man/cpl_complete_word.3
                 The use of a publically defined structure to configure
                 the cpl_file_completions() callback was flawed, so a new
                 approach has been designed, and the old method, albeit
                 still supported, is no longer documented in the man
                 pages. The definition of the CplFileArgs structure in
                 libtecla.h is now accompanied by comments warning people
                 not to modify it, since modifications could break
                 applications linked to shared versions of the tecla
                 library. The new method involves an opaque CplFileConf
                 object, instances of which are returned by a provided
                 constructor function, configured with provided accessor
                 functions, and when no longer needed, deleted with a
                 provided destructor function. This is documented in the
                 cpl_complete_word man page. The cpl_file_completions()
                 callback distinguishes what type of configuration
                 structure it has been sent by virtue of a code placed at
                 the beginning of the CplFileConf argument by its
                 constructor.

    04/01/2001 mcs@astro.caltech.edu (Release of version 1.1j)

               getline.c
                 I added upper-case bindings for the default meta-letter
                 keysequences such as M-b. They thus continue to work
                 when the user has caps-lock on.
               Makefile
                 I re-implemented the "install" target in terms of new
                 install_lib, install_inc and install_man targets. When
                 distributing the library with other packages, these new
                 targets allows for finer grained control of the
                 installation process.

    30/12/2000 mcs@astro.caltech.edu

               getline.c man/gl_get_line.3
                 I realized that the recall-history action that I
                 implemented wasn't what Markus had asked me for. What he
                 actually wanted was for down-history to continue going
                 forwards through a previous history recall session if no
                 history recall session had been started while entering
                 the current line. I have thus removed the recall-history
                 action and modified the down-history action function
                 accordingly.

    24/12/2000 mcs@astro.caltech.edu

               getline.c
                 I modified gl_get_line() to allow the previously returned
                 line to be passed in the start_line argument.
               getline.c man/gl_get_line.3
                 I added a recall-history action function, bound to M^P.
                 This recalls the last recalled history line, regardless
                 of whether it was from the current or previous line.

    13/12/2000 mcs@astro.caltech.edu (Release of version 1.1i)

               getline.c history.h history.c man/gl_get_line.3
                 I implemented the equivalent of the ksh Operate action. I
                 have named the tecla equivalent "repeat-history". This
                 causes the line that is to be edited to returned, and
                 arranges for the next most recent history line to be
                 preloaded on the next call to gl_get_line(). Repeated
                 invocations of this action thus result in successive
                 history lines being repeated - hence the
                 name. Implementing the ksh Operate action was suggested
                 by Markus Gyger. In ksh it is bound to ^O, but since ^O
                 is traditionally bound by the default terminal settings,
                 to stop-output, I have bound the tecla equivalent to M-o.

    01/12/2000 mcs@astro.caltech.edu (Release of version 1.1h)

               getline.c keytab.c keytab.h man/gl_get_line.3
                 I added a digit-argument action, to allow repeat
                 counts for actions to be entered. As in both tcsh
                 and readline, this is bound by default to each of
                 M-0, M-1 through to M-9, the number being appended
                 to the current repeat count. Once one of these has been
                 pressed, the subsequent digits of the repeat count can be
                 typed with or without the meta key pressed. It is also
                 possible to bind digit-argument to other keys, with or
                 without a numeric final keystroke. See man page for
                 details.

               getline.c man/gl_get_line.3
                 Markus noted that my choice of M-< for the default
                 binding of read-from-file, could be confusing, since
                 readline binds this to beginning-of-history. I have
                 thus rebound it to ^X^F (ie. like find-file in emacs).

               getline.c history.c history.h man/gl_get_line.3
                 I have now implemented equivalents of the readline
                 beginning-of-history and end-of-history actions.
                 These are bound to M-< and M-> respectively.

               history.c history.h
                 I Moved the definition of the GlHistory type, and
                 its subordinate types from history.h to history.c.
                 There is no good reason for any other module to
                 have access to the innards of this structure.

    27/11/2000 mcs@astro.caltech.edu (Release of version 1.1g)

               getline.c man/gl_get_line.3
                 I added a "read-from-file" action function and bound it
                 by default to M-<. This causes gl_get_line() to
                 temporarily return input from the file who's name
                 precedes the cursor.

    26/11/2000 mcs@astro.caltech.edu

               getline.c keytab.c keytab.h man/gl_get_line.3
                 I have reworked some of the keybinding code again.

                 Now, within key binding strings, in addition to the
                 previously existing notation, you can now use M-a to
                 denote meta-a, and C-a to denote control-a. For example,
                 a key binding which triggers when the user presses the
                 meta key, the control key and the letter [
                 simultaneously, can now be denoted by M-C-[, or M-^[ or
                 \EC-[ or \E^[.

                 I also updated the man page to use M- instead of \E in
                 the list of default bindings, since this looks cleaner.

               getline.c man/gl_get_line.3
                 I added a copy-region-as-kill action function and
                 gave it a default binding to M-w.

    22/11/2000 mcs@astro.caltech.edu

               *.c
                 Markus Gyger sent me a copy of a previous version of
                 the library, with const qualifiers added in appropriate
                 places. I have done the same for the latest version.
                 Among other things, this gets rid of the warnings
                 that are generated if one tells the compiler to
                 const qualify literal strings.

               getline.c getline.h glconf.c
                 I have moved the contents of glconf.c and the declaration
                 of the GetLine structure into getline.c. This is cleaner,
                 since now only functions in getline.c can mess with the
                 innards of GetLine objects. It also clears up some problems
                 with system header inclusion order under Solaris, and also
                 the possibility that this might result in inconsistent
                 system macro definitions, which in turn could cause different
                 declarations of the structure to be seen in different files.

               hash.c
                 I wrote a wrapper function to go around strcmp(), such that
                 when hash.c is compiled with a C++ compiler, the pointer
                 to the wrapper function is a C++ function pointer.
                 This makes it compatible with comparison function pointer
                 recorded in the hash table.

               cplmatch.c getline.c libtecla.h
                 Markus noted that the Sun C++ compiler wasn't able to
                 match up the declaration of cpl_complete_word() in
                 libtecla.h, where it is surrounded by a extern "C" {}
                 wrapper, with the definition of this function in
                 cplmatch.c. My suspicion is that the compiler looks not
                 only at the function name, but also at the function
                 arguments to see if two functions match, and that the
                 match_fn() argument, being a fully blown function pointer
                 declaration, got interpetted as that of a C function in
                 one case, and a C++ function in the other, thus
                 preventing a match.

                 To fix this I now define a CplMatchFn typedef in libtecla.h,
                 and use this to declare the match_fn callback.

    20/11/2000 (Changes suggested by Markus Gyger to support C++ compilers):
               expand.c
                 Renamed a variable called "explicit" to "xplicit", to
                 avoid conflicts when compiling with C++ compilers.
               *.c
                 Added explicit casts when converting from (void *) to
                 other pointer types. This isn't needed in C but it is
                 in C++.
               getline.c
                 tputs() has a strange declaration under Solaris. I was
                 enabling this declaration when the SPARC feature-test
                 macro was set. Markus changed the test to hinge on the
                 __sun and __SVR4 macros.
               direader.c glconf.c stringrp.c
                 I had omitted to include string.h in these two files.

               Markus also suggested some other changes, which are still
               under discussion. With the just above changes however, the
               library compiles without complaint using g++.

    19/11/2000 mcs@astro.caltech.edu
               getline.h getline.c keytab.c keytab.h glconf.c
               man/gl_get_line.3
                 I added support for backslash escapes (include \e
                 for the keyboard escape key) and literal binary
                 characters to the characters allowed within key sequences
                 of key bindings.

               getline.h getline.c keytab.c keytab.h glconf.c
               man/gl_get_line.3
                 I introduced symbolic names for the arrow keys, and
                 modified the library to use the cursor key sequences
                 reported by terminfo/termcap in addition to the default
                 ANSI ones. Anything bound to the symbolically named arrow
                 keys also gets bound to the default and terminfo/termcap
                 cursor key sequences. Note that under Solaris
                 terminfo/termcap report the properties of hardware X
                 terminals when TERM is xterm instead of the terminal
                 emulator properties, and the cursor keys on these two
                 systems generate different key sequences. This is an
                 example of why extra default sequences are needed.

               getline.h getline.c keytab.c
                 For some reason I was using \e to represent the escape
                 character. This is supported by gcc, which thus doesn't
                 emit a warning except with the -pedantic flag, but isn't
                 part of standard C. I now use a macro to define escape
                 as \033 in getline.h, and this is now used wherever the
                 escape character is needed.

    17/11/2000 mcs@astro.caltech.edu (Release of version 1.1d)

               getline.c, man/gl_get_line(3), html/gl_get_line.html
                 In tcsh ^D is bound to a function which does different
                 things depending on where the cursor is within the input
                 line. I have implemented its equivalent in the tecla
                 library. When invoked at the end of the line this action
                 function displays possible completions. When invoked on
                 an empty line it causes gl_get_line() to return NULL,
                 thus signalling end of input. When invoked within a line
                 it invokes forward-delete-char, as before. The new action
                 function is called del-char-or-list-or-eof.

               getline.c, man/gl_get_line(3), html/gl_get_line.html
                 I found that the complete-word and expand-file actions
                 had underscores in their names instead of hyphens. This
                 made them different from all other action functions, so I
                 have changed the underscores to hyphens.

               homedir.c
                 On SCO UnixWare while getpwuid_r() is available, the
                 associated _SC_GETPW_R_SIZE_MAX macro used by sysconf()
                 to find out how big to make the buffer to pass to this
                 function to cater for any password entry, doesn't
                 exist. I also hadn't catered for the case where sysconf()
                 reports that this limit is indeterminate. I have thus
                 change the code to substitute a default limit of 1024 if
                 either the above macro isn't defined or if sysconf() says
                 that the associated limit is indeterminate.

    17/11/2000 mcs@astro.caltech.edu (Release of version 1.1c)

               getline.c, getline.h, history.c, history.h
                 I have modified the way that the history recall functions
                 operate, to make them better emulate the behavior of
                 tcsh. Previously the history search bindings always
                 searched for the prefix that preceded the cursor, then
                 left the cursor at the same point in the line, so that a
                 following search would search using the same prefix. This
                 isn't how tcsh operates. On finding a matching line, tcsh
                 puts the cursor at the end of the line, but arranges for
                 the followup search to continue with the same prefix,
                 unless the user does any cursor motion or character
                 insertion operations in between, in which case it changes
                 the search prefix to the new set of characters that are
                 before the cursor. There are other complications as well,
                 which I have attempted to emulate. As far as I can
                 tell, the tecla history recall facilities now fully
                 emulate those of tcsh.

    16/11/2000 mcs@astro.caltech.edu (Release of version 1.1b)

               demo.c:
                 One can now quit from the demo by typing exit.

               keytab.c:
                 The first entry of the table was getting deleted
                 by _kt_clear_bindings() regardless of the source
                 of the binding. This deleted the up-arrow binding.
                 Symptoms noted by gazelle@yin.interaccess.com.

               getline.h:
                 Depending on which system include files were include
                 before the inclusion of getline.h, SIGWINCH and
                 TIOCGWINSZ might or might not be defined. This resulted
                 in different definitions of the GetLine object in
                 different files, and thus some very strange bugs! I have
                 now added #includes for the necessary system header files
                 in getline.h itself. The symptom was that on creating a
                 ~/.teclarc file, the demo program complained of a NULL
                 argument to kt_set_keybinding() for the first line of the
                 file.

    15/11/2000 mcs@astro.caltech.edu (Release of version 1.1a)

               demo.c:
                 I had neglected to check the return value of
                 new_GetLine() in the demo program. Oops.

               getline.c libtecla.h:
                 I wrote gl_change_terminal(). This allows one to change to
                 a different terminal or I/O stream, by specifying the
                 stdio streams to use for input and output, along with the
                 type of terminal that they are connected to.

               getline.c libtecla.h:
                 Renamed GetLine::isterm to GetLine::is_term. Standard
                 C reserves names that start with "is" followed by
                 alphanumeric characters, so this avoids potential
                 clashes in the future.

               keytab.c keytab.h
                 Each key-sequence can now have different binding
                 functions from different sources, with the user provided
                 binding having the highest precedence, followed by the
                 default binding, followed by any terminal specific
                 binding. This allows gl_change_terminal() to redefine the
                 terminal-specific bindings each time that
                 gl_change_terminal() is called, without overwriting the
                 user specified or default bindings. In the future, it will
                 also allow for reconfiguration of user specified
                 bindings after the call to new_GetLine(). Ie. deleting a
                 user specified binding should reinstate any default or
                 terminal specific binding.

               man/cpl_complete_word.3 html/cpl_complete_word.html
               man/ef_expand_file.3    html/ef_expand_file.html
               man/gl_get_line.3       html/gl_get_line.html
                 I added sections on thread safety to the man pages of the
                 individual modules.

               man/gl_get_line.3       html/gl_get_line.html
                 I documented the new gl_change_terminal() function.

               man/gl_get_line.3       html/gl_get_line.html
                 In the description of the ~/.teclarc configuration file,
                 I had omitted the 'bind' command word in the example
                 entry. I have now remedied this.