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/*
* wchar utility functions.
*
* Copyright (c) 2012 Marko Kreen
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <usual/wchar.h>
#include <string.h>
wchar_t *mbstr_decode(const char *str, int str_len, int *wlen_p,
wchar_t *wbuf, int wbuf_len, bool allow_invalid)
{
mbstate_t ps;
int clen;
wchar_t *dst, *w, *wend;
const char *s;
const char *str_end;
int wmax;
if (str_len < 0)
str_len = strlen(str);
str_end = str + str_len;
/* max number of wchar_t that the output can take plus zero-terminator */
wmax = str_len + 1;
if (wbuf != NULL && wmax < wbuf_len) {
dst = wbuf;
} else {
dst = malloc(sizeof(wchar_t) * wmax);
if (!dst)
return NULL;
}
/* try full decode at once */
s = str;
memset(&ps, 0, sizeof(ps));
clen = mbsnrtowcs(dst, &s, str_len, wmax, &ps);
if (clen >= 0) {
if (wlen_p)
*wlen_p = clen;
dst[clen] = 0;
return dst;
}
if (!allow_invalid)
goto fail;
/* full decode failed, decode chars one-by-one */
s = str;
w = dst;
wend = dst + wmax - 1;
memset(&ps, 0, sizeof(ps));
while (s < str_end && w < wend) {
clen = mbrtowc(w, s, str_end - s, &ps);
if (clen > 0) {
/* single char */
w++;
s += clen;
} else if (clen == 0) {
/* string end */
break;
} else if (allow_invalid) {
/* allow invalid encoding */
memset(&ps, 0, sizeof(ps));
*w++ = (unsigned char)*s++;
} else {
/* invalid encoding */
goto fail;
}
}
/* make sure we got string end */
if (s < str_end && *s != '\0')
goto fail;
*w = 0;
if (wlen_p)
*wlen_p = w - dst;
return dst;
fail:
if (dst != wbuf)
free(dst);
return NULL;
}
wctype_t wctype_wcsn(const wchar_t *name, unsigned int namelen)
{
char buf[10];
unsigned int i;
if (namelen >= sizeof(buf))
return (wctype_t)0;
for (i = 0; i < namelen; i++) {
wchar_t c = name[i];
if (c < 0x20 || c > 127)
return (wctype_t)0;
buf[i] = c;
}
buf[i] = 0;
return wctype(buf);
}
#ifndef HAVE_MBSNRTOWCS
size_t mbsnrtowcs(wchar_t *dst, const char **src_p, size_t srclen, size_t dstlen, mbstate_t *ps)
{
int clen;
const char *s, *s_end;
wchar_t *w;
mbstate_t pstmp;
size_t count = 0;
if (!ps) {
memset(&pstmp, 0, sizeof(pstmp));
ps = &pstmp;
}
s = *src_p;
s_end = s + srclen;
w = dst;
while (s < s_end) {
if (w && count >= dstlen) {
/* dst is full */
break;
}
clen = mbrtowc(w, s, s_end - s, ps);
if (clen > 0) {
/* proper character */
if (w)
w++;
count++;
s += clen;
} else if (clen < 0) {
/* invalid encoding */
*src_p = s;
return (size_t)(-1);
} else {
/* end of string */
if (w)
*w = 0;
*src_p = NULL;
return count;
}
}
/* end due to srclen */
*src_p = s;
return count;
}
#endif
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