ea4ac135ff
mbsrtowcs() and wcsrtombs(). Provide a fast implementation for the trivial "NONE" encoding.
112 lines
3.0 KiB
C
112 lines
3.0 KiB
C
/*-
|
|
* Copyright (c) 2002-2004 Tim J. Robbins.
|
|
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <wchar.h>
|
|
#include "mblocal.h"
|
|
|
|
size_t
|
|
wcsrtombs(char * __restrict dst, const wchar_t ** __restrict src, size_t len,
|
|
mbstate_t * __restrict ps)
|
|
{
|
|
static mbstate_t mbs;
|
|
|
|
if (ps == NULL)
|
|
ps = &mbs;
|
|
return (__wcsrtombs(dst, src, len, ps));
|
|
}
|
|
|
|
size_t
|
|
__wcsrtombs_std(char * __restrict dst, const wchar_t ** __restrict src,
|
|
size_t len, mbstate_t * __restrict ps)
|
|
{
|
|
mbstate_t mbsbak;
|
|
char buf[MB_LEN_MAX];
|
|
const wchar_t *s;
|
|
size_t nbytes;
|
|
int nb;
|
|
|
|
s = *src;
|
|
nbytes = 0;
|
|
|
|
if (dst == NULL) {
|
|
for (;;) {
|
|
if ((nb = (int)__wcrtomb(buf, *s, ps)) < 0)
|
|
/* Invalid character - wcrtomb() sets errno. */
|
|
return ((size_t)-1);
|
|
else if (*s == L'\0')
|
|
return (nbytes + nb - 1);
|
|
s++;
|
|
nbytes += nb;
|
|
}
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
while (len > 0) {
|
|
if (len > (size_t)MB_CUR_MAX) {
|
|
/* Enough space to translate in-place. */
|
|
if ((nb = (int)__wcrtomb(dst, *s, ps)) < 0) {
|
|
*src = s;
|
|
return ((size_t)-1);
|
|
}
|
|
} else {
|
|
/*
|
|
* May not be enough space; use temp. buffer.
|
|
*
|
|
* We need to save a copy of the conversion state
|
|
* here so we can restore it if the multibyte
|
|
* character is too long for the buffer.
|
|
*/
|
|
mbsbak = *ps;
|
|
if ((nb = (int)__wcrtomb(buf, *s, ps)) < 0) {
|
|
*src = s;
|
|
return ((size_t)-1);
|
|
}
|
|
if (nb > (int)len) {
|
|
/* MB sequence for character won't fit. */
|
|
*ps = mbsbak;
|
|
break;
|
|
}
|
|
memcpy(dst, buf, nb);
|
|
}
|
|
if (*s == L'\0') {
|
|
*src = NULL;
|
|
return (nbytes + nb - 1);
|
|
}
|
|
s++;
|
|
dst += nb;
|
|
len -= nb;
|
|
nbytes += nb;
|
|
}
|
|
*src = s;
|
|
return (nbytes);
|
|
}
|