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/*++
/* NAME
/* strcasecmp_utf8 3
/* SUMMARY
/* caseless string comparison
/* SYNOPSIS
/* #include <stringops.h>
/*
/* int strcasecmp_utf8(
/* const char *s1,
/* const char *s2)
/*
/* int strncasecmp_utf8(
/* const char *s1,
/* const char *s2,
/* ssize_t len)
/* AUXILIARY FUNCTIONS
/* int strcasecmp_utf8x(
/* int flags,
/* const char *s1,
/* const char *s2)
/*
/* int strncasecmp_utf8x(
/* int flags,
/* const char *s1,
/* const char *s2,
/* ssize_t len)
/* DESCRIPTION
/* strcasecmp_utf8() implements caseless string comparison for
/* UTF-8 text, with an API similar to strcasecmp(). Only ASCII
/* characters are casefolded when the code is compiled without
/* EAI support or when util_utf8_enable is zero.
/*
/* strncasecmp_utf8() implements caseless string comparison
/* for UTF-8 text, with an API similar to strncasecmp(). Only
/* ASCII characters are casefolded when the code is compiled
/* without EAI support or when util_utf8_enable is zero.
/*
/* strcasecmp_utf8x() and strncasecmp_utf8x() implement a more
/* complex API that provides the above functionality and more.
/*
/* Arguments:
/* .IP "s1, s2"
/* Null-terminated strings to be compared.
/* .IP len
/* String length before casefolding.
/* .IP flags
/* Zero or CASEF_FLAG_UTF8. The latter flag enables UTF-8 case
/* folding instead of folding only ASCII characters. This flag
/* is ignored when compiled without EAI support.
/* SEE ALSO
/* casefold(), casefold text for caseless comparison.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
#include <string.h>
#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif
/*
* Utility library.
*/
#include <stringops.h>
#define STR(x) vstring_str(x)
static VSTRING *f1; /* casefold result for s1 */
static VSTRING *f2; /* casefold result for s2 */
/* strcasecmp_utf8_init - initialize */
static void strcasecmp_utf8_init(void)
{
f1 = vstring_alloc(100);
f2 = vstring_alloc(100);
}
/* strcasecmp_utf8x - caseless string comparison */
int strcasecmp_utf8x(int flags, const char *s1, const char *s2)
{
/*
* Short-circuit optimization for ASCII-only text. This may be slower
* than using a cache for all results. We must not expose strcasecmp(3)
* to non-ASCII text.
*/
if (allascii(s1) && allascii(s2))
return (strcasecmp(s1, s2));
if (f1 == 0)
strcasecmp_utf8_init();
/*
* Cross our fingers and hope that strcmp() remains agnostic of
* charactersets and locales.
*/
flags &= CASEF_FLAG_UTF8;
casefoldx(flags, f1, s1, -1);
casefoldx(flags, f2, s2, -1);
return (strcmp(STR(f1), STR(f2)));
}
/* strncasecmp_utf8x - caseless string comparison */
int strncasecmp_utf8x(int flags, const char *s1, const char *s2,
ssize_t len)
{
/*
* Consider using a cache for all results.
*/
if (f1 == 0)
strcasecmp_utf8_init();
/*
* Short-circuit optimization for ASCII-only text. This may be slower
* than using a cache for all results. See comments above for limitations
* of strcasecmp().
*/
if (allascii_len(s1, len) && allascii_len(s2, len))
return (strncasecmp(s1, s2, len));
/*
* Caution: casefolding may change the number of bytes. See comments
* above for concerns about strcmp().
*/
flags &= CASEF_FLAG_UTF8;
casefoldx(flags, f1, s1, len);
casefoldx(flags, f2, s2, len);
return (strcmp(STR(f1), STR(f2)));
}
#ifdef TEST
#include <stdio.h>
#include <stdlib.h>
#include <vstream.h>
#include <vstring_vstream.h>
#include <msg_vstream.h>
#include <argv.h>
int main(int argc, char **argv)
{
VSTRING *buffer = vstring_alloc(1);
ARGV *cmd;
char **args;
int len;
int flags;
int res;
msg_vstream_init(argv[0], VSTREAM_ERR);
flags = CASEF_FLAG_UTF8;
util_utf8_enable = 1;
while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
vstream_printf("> %s\n", STR(buffer));
cmd = argv_split(STR(buffer), CHARS_SPACE);
if (cmd->argc == 0 || cmd->argv[0][0] == '#')
continue;
args = cmd->argv;
/*
* Compare two strings.
*/
if (strcmp(args[0], "compare") == 0 && cmd->argc == 3) {
res = strcasecmp_utf8x(flags, args[1], args[2]);
vstream_printf("\"%s\" %s \"%s\"\n",
args[1],
res < 0 ? "<" : res == 0 ? "==" : ">",
args[2]);
}
/*
* Compare two substrings.
*/
else if (strcmp(args[0], "compare-len") == 0 && cmd->argc == 4
&& sscanf(args[3], "%d", &len) == 1 && len >= 0) {
res = strncasecmp_utf8x(flags, args[1], args[2], len);
vstream_printf("\"%.*s\" %s \"%.*s\"\n",
len, args[1],
res < 0 ? "<" : res == 0 ? "==" : ">",
len, args[2]);
}
/*
* Usage.
*/
else {
vstream_printf("Usage: %s compare <s1> <s2> | compare-len <s1> <s2> <len>\n",
argv[0]);
}
vstream_fflush(VSTREAM_OUT);
argv_free(cmd);
}
exit(0);
}
#endif /* TEST */
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