/* $Id: util.h,v 1.6.2.2 2002/01/18 08:31:12 m-kasahr Exp $ */
/*
 * Copyright (c) 2000 Japan Network Information Center.  All rights reserved.
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 * a Japanese association, Kokusai-Kougyou-Kanda Bldg 6F, 2-3-4 Uchi-Kanda,
 * Chiyoda-ku, Tokyo 101-0047, Japan.
 * 
 * 1. Use, Modification and Redistribution (including distribution of any
 *    modified or derived work) in source and/or binary forms is permitted
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 */

#ifndef MDN_UTIL_H
#define MDN_UTIL_H 1

/*
 * Utility functions.
 */

/*
 * Case-insensitive string match.
 *
 * This function compares two strings in case-insensitive way, like
 * strcasencmp() function which can be found in many systems.
 * However, this function only disregards the case difference of ASCII
 * letters ([A-Za-z]), so it is locale independent.
 * The result is 1 if 's1' and 's2' match, 0 otherwise.
 */
extern int
mdn_util_casematch(const char *s1, const char *s2, size_t n);

/*
 * Get a range of valid domain name characters.
 *
 * This function sees each character in string 's' until 'end',
 * and checks if it is valid as a character in ASCII domain names.
 * It returns a pointer to the first invalid character, or 'end'
 * if all characters are valid.
 */
extern const char *
mdn_util_domainspan(const char *s, const char *end);

/*
 * Test whether a string is valid domain name defined by STD 13.
 *
 * This function sees each character in string 's' until 'end', and
 * checks if the string is valid as an ASCII domain name that STD 13
 * defines.  If valid, it returns 1.  Otherwise, it returns 0.
 */
extern int
mdn_util_validstd13(const char *s, const char *end);

/*
 * Test whether a string contains non-LDH ASCII code points
 * (U+0020 ... U+007E).
 *
 * This function sees each character in string 's' until 'end'.
 * If non-LDH code point (U+0020 ... U+007E) is found, it returns 1.
 * Otherwise, it returns 0.
 */
extern int
mdn_util_havenonldhascii(const char *s, const char *end);

/*
 * UTF-8 to UTF-16 conversion and vice versa.
 */
extern mdn_result_t
mdn_util_utf8toutf16(const char *utf8, size_t fromlen,
		     unsigned short *utf16, size_t tolen, size_t *reslenp);

extern mdn_result_t
mdn_util_utf16toutf8(const unsigned short *utf16, size_t fromlen,
		     char *utf8, size_t tolen, size_t *reslenp);

#endif /* MDN_UTIL_H */
