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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* UTF-8 encoded Unicode parsing routines. For efficiency, we convert
* to wide chars only when absolutely needed. The following interfaces
* are exported to libslp:
*
* slp_utf_strchr: same semantics as strchr, but handles UTF-8 strings
* slp_fold_space: folds white space around and in between works;
* handles UTF-8 strings
* slp_strcasecmp: same semantics as strcasecmp, but also folds white
* space and attempts locale-specific
* case-insensitive comparisons.
*/
#include <stdio.h>
#include <string.h>
#include <widec.h>
#include <stdlib.h>
#include <syslog.h>
#include <slp-internal.h>
/*
* Same semantics as strchr.
* Assumes that we start on a char boundry, and that c is a 7-bit
* ASCII char.
*/
char *slp_utf_strchr(const char *s, char c) {
int len;
char *p;
for (p = (char *)s; *p; p += len) {
len = mblen(p, MB_CUR_MAX);
if (len == 1 && *p == c)
return (p);
}
return (NULL);
}
/*
* folds white space around and in between words.
* " aa bb " becomes "aa bb".
* returns NULL if it couldn't allocate memory. The caller must free
* the result when done.
*/
static char *slp_fold_space(const char *s) {
int len;
char *folded, *f;
if (!(folded = malloc(strlen(s) + 1))) {
slp_err(LOG_CRIT, 0, "slp_fold_space", "out of memory");
return (NULL);
}
f = folded;
for (;;) {
/* step 1: skip white space */
for (; *s; s++) {
len = mblen(s, MB_CUR_MAX);
if (len != 1)
break;
if (!isspace(*s))
break;
}
if (!*s) {
/* end of string */
*f = 0;
return (folded);
}
/* if we are in between words, keep one space */
if (f != folded)
*f++ = ' ';
/* step 2: copy into folded until we hit more white space */
while (*s) {
int i;
len = mblen(s, MB_CUR_MAX);
if (len == 1 && isspace(*s))
break;
for (i = 0; i < len; i++)
*f++ = *s++;
}
*f = *s;
if (!*s++)
return (folded);
}
}
/*
* performs like strcasecmp, but also folds white space before comparing,
* and will handle UTF-8 comparisons (including case). Note that the
* application's locale must have been set to a UTF-8 locale for this
* to work properly.
*/
int slp_strcasecmp(const char *s1, const char *s2) {
int diff = -1;
char *p1, *p2;
size_t wcslen1, wcslen2;
wchar_t *wcs1, *wcs2;
p1 = p2 = NULL; wcs1 = wcs2 = NULL;
/* optimization: try simple case first */
if (strcasecmp(s1, s2) == 0)
return (0);
/* fold white space, and try again */
p1 = slp_fold_space(s1);
p2 = slp_fold_space(s2);
if (!p1 || !p2)
goto cleanup;
if ((diff = strcasecmp(p1, p2)) == 0)
goto cleanup;
/*
* try converting to wide char -- we must be in a locale which
* supports the UTF8 codeset for this to work.
*/
if ((wcslen1 = mbstowcs(NULL, p1, 0)) == (size_t)-1)
goto cleanup;
if (!(wcs1 = malloc(sizeof (*wcs1) * (wcslen1 + 1)))) {
slp_err(LOG_CRIT, 0, "slp_strcasecmp", "out of memory");
goto cleanup;
}
if ((wcslen2 = mbstowcs(NULL, p2, 0)) == (size_t)-1)
goto cleanup;
if (!(wcs2 = malloc(sizeof (*wcs2) * (wcslen2 + 1)))) {
slp_err(LOG_CRIT, 0, "slp_strcasecmp", "out of memory");
goto cleanup;
}
if (mbstowcs(wcs1, p1, wcslen1 + 1) == (size_t)-1)
goto cleanup;
if (mbstowcs(wcs2, p2, wcslen2 + 1) == (size_t)-1)
goto cleanup;
diff = wscasecmp(wcs1, wcs2);
cleanup:
if (p1) free(p1);
if (p2) free(p2);
if (wcs1) free(wcs1);
if (wcs2) free(wcs2);
return (diff);
}
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