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/* Convert wide string to string.
Copyright (C) 2008-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2008.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
size_t
wcsnrtombs (char *dest, const wchar_t **srcp, size_t srclen, size_t len, mbstate_t *ps)
{
if (ps == NULL)
ps = &_gl_wcsrtombs_state;
{
const wchar_t *src = *srcp;
size_t cur_max = MB_CUR_MAX;
char buf[64];
if (!(cur_max <= sizeof (buf)))
abort ();
if (dest != NULL)
{
char *destptr = dest;
for (; srclen > 0 && len > 0; src++, srclen--)
{
wchar_t wc = *src;
size_t ret = wcrtomb (len >= cur_max ? destptr : buf, wc, ps);
if (ret == (size_t)(-1))
goto bad_input;
if (!(ret <= cur_max))
abort ();
if (len < ret)
break;
if (len < cur_max)
memcpy (destptr, buf, ret);
if (wc == 0)
{
src = NULL;
/* Here mbsinit (ps). */
break;
}
destptr += ret;
len -= ret;
}
*srcp = src;
return destptr - dest;
}
else
{
/* Ignore dest and len, don't store *srcp at the end, and
don't clobber *ps. */
mbstate_t state = *ps;
size_t totalcount = 0;
for (; srclen > 0; src++, srclen--)
{
wchar_t wc = *src;
size_t ret = wcrtomb (buf, wc, &state);
if (ret == (size_t)(-1))
goto bad_input2;
if (wc == 0)
{
/* Here mbsinit (&state). */
break;
}
totalcount += ret;
}
return totalcount;
}
bad_input:
*srcp = src;
bad_input2:
errno = EILSEQ;
return (size_t)(-1);
}
}
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