freebsd-dev/lib/libc/string/wcsxfrm.c
Tim J. Robbins dc763237da Prepare to handle state-dependent encodings. This mainly involves not
taking shortcuts when it comes to storing and passing around conversion
states.
2004-04-07 09:47:56 +00:00

117 lines
2.9 KiB
C

/*-
* Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
* at Electronni Visti IA, Kiev, Ukraine.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if 0
__FBSDID("FreeBSD: src/lib/libc/string/strxfrm.c,v 1.15 2002/09/06 11:24:06 tjr Exp ");
#endif
__FBSDID("$FreeBSD$");
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "collate.h"
static char *__mbsdup(const wchar_t *);
/*
* Placeholder wcsxfrm() implementation. See wcscoll.c for a description of
* the logic used.
*/
size_t
wcsxfrm(wchar_t * __restrict dest, const wchar_t * __restrict src, size_t len)
{
int prim, sec, l;
size_t slen;
char *mbsrc, *s, *ss;
if (*src == L'\0') {
if (len != 0)
*dest = L'\0';
return (0);
}
if (__collate_load_error || MB_CUR_MAX > 1) {
slen = wcslen(src);
if (len > 0) {
if (slen < len)
wcscpy(dest, src);
else {
wcsncpy(dest, src, len - 1);
dest[len - 1] = L'\0';
}
}
return (slen);
}
mbsrc = __mbsdup(src);
slen = 0;
prim = sec = 0;
ss = s = __collate_substitute(mbsrc);
while (*s != '\0') {
while (*s != '\0' && prim == 0) {
__collate_lookup(s, &l, &prim, &sec);
s += l;
}
if (prim != 0) {
if (len > 1) {
*dest++ = (wchar_t)prim;
len--;
}
slen++;
prim = 0;
}
}
free(ss);
free(mbsrc);
if (len != 0)
*dest = L'\0';
return (slen);
}
static char *
__mbsdup(const wchar_t *ws)
{
static const mbstate_t initial;
mbstate_t st;
const wchar_t *wcp;
size_t len;
char *mbs;
wcp = ws;
st = initial;
if ((len = wcsrtombs(NULL, &wcp, 0, &st)) == (size_t)-1)
return (NULL);
if ((mbs = malloc(len + 1)) == NULL)
return (NULL);
st = initial;
wcsrtombs(mbs, &ws, len + 1, &st);
return (mbs);
}