123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/* Convert string to wide string.
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Copyright (C) 2008-2016 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2008.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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size_t
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mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps)
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{
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if (ps == NULL)
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ps = &_gl_mbsrtowcs_state;
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{
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const char *src = *srcp;
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if (dest != NULL)
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{
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wchar_t *destptr = dest;
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for (; len > 0; destptr++, len--)
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{
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size_t src_avail;
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size_t ret;
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/* An optimized variant of
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src_avail = strnlen1 (src, MB_LEN_MAX); */
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if (src[0] == '\0')
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src_avail = 1;
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else if (src[1] == '\0')
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src_avail = 2;
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else if (src[2] == '\0')
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src_avail = 3;
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else if (MB_LEN_MAX <= 4 || src[3] == '\0')
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src_avail = 4;
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else
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src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);
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/* Parse the next multibyte character. */
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ret = mbrtowc (destptr, src, src_avail, ps);
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if (ret == (size_t)(-2))
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/* Encountered a multibyte character that extends past a '\0' byte
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or that is longer than MB_LEN_MAX bytes. Cannot happen. */
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abort ();
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if (ret == (size_t)(-1))
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goto bad_input;
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if (ret == 0)
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{
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src = NULL;
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/* Here mbsinit (ps). */
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break;
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}
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src += ret;
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}
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*srcp = src;
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return destptr - dest;
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}
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else
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{
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/* Ignore dest and len, don't store *srcp at the end, and
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don't clobber *ps. */
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mbstate_t state = *ps;
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size_t totalcount = 0;
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for (;; totalcount++)
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{
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size_t src_avail;
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size_t ret;
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/* An optimized variant of
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src_avail = strnlen1 (src, MB_LEN_MAX); */
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if (src[0] == '\0')
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src_avail = 1;
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else if (src[1] == '\0')
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src_avail = 2;
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else if (src[2] == '\0')
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src_avail = 3;
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else if (MB_LEN_MAX <= 4 || src[3] == '\0')
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src_avail = 4;
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else
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src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);
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/* Parse the next multibyte character. */
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ret = mbrtowc (NULL, src, src_avail, &state);
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if (ret == (size_t)(-2))
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/* Encountered a multibyte character that extends past a '\0' byte
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or that is longer than MB_LEN_MAX bytes. Cannot happen. */
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abort ();
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if (ret == (size_t)(-1))
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goto bad_input2;
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if (ret == 0)
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{
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/* Here mbsinit (&state). */
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break;
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}
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src += ret;
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}
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return totalcount;
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}
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bad_input:
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*srcp = src;
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bad_input2:
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errno = EILSEQ;
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return (size_t)(-1);
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}
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}
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