1 /* Convert string to wide string.
2 Copyright (C) 2008-2011 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2008.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
31 extern mbstate_t _gl_mbsrtowcs_state;
34 mbsnrtowcs (wchar_t *dest, const char **srcp, size_t srclen, size_t len, mbstate_t *ps)
37 ps = &_gl_mbsrtowcs_state;
39 const char *src = *srcp;
43 wchar_t *destptr = dest;
45 for (; srclen > 0 && len > 0; destptr++, len--)
50 /* An optimized variant of
51 src_avail = strnlen1 (src, MIN (srclen, MB_LEN_MAX)); */
52 if (srclen == 1 || src[0] == '\0')
54 else if (srclen == 2 || src[1] == '\0')
56 else if (srclen == 3 || src[2] == '\0')
58 else if (MB_LEN_MAX <= 4 || srclen == 4 || src[3] == '\0')
61 src_avail = 4 + strnlen1 (src + 4, MIN (srclen, MB_LEN_MAX) - 4);
63 /* Parse the next multibyte character. */
64 ret = mbrtowc (destptr, src, src_avail, ps);
66 if (ret == (size_t)(-2))
67 /* Encountered a multibyte character that extends past a '\0' byte
68 or that is longer than MB_LEN_MAX bytes. Cannot happen. */
71 if (ret == (size_t)(-1))
76 /* Here mbsinit (ps). */
84 return destptr - dest;
88 /* Ignore dest and len, don't store *srcp at the end, and
90 mbstate_t state = *ps;
91 size_t totalcount = 0;
93 for (; srclen > 0; totalcount++)
98 /* An optimized variant of
99 src_avail = strnlen1 (src, MIN (srclen, MB_LEN_MAX)); */
100 if (srclen == 1 || src[0] == '\0')
102 else if (srclen == 2 || src[1] == '\0')
104 else if (srclen == 3 || src[2] == '\0')
106 else if (MB_LEN_MAX <= 4 || srclen == 4 || src[3] == '\0')
109 src_avail = 4 + strnlen1 (src + 4, MIN (srclen, MB_LEN_MAX) - 4);
111 /* Parse the next multibyte character. */
112 ret = mbrtowc (NULL, src, src_avail, &state);
114 if (ret == (size_t)(-2))
115 /* Encountered a multibyte character that extends past a '\0' byte
116 or that is longer than MB_LEN_MAX bytes. Cannot happen. */
119 if (ret == (size_t)(-1))
123 /* Here mbsinit (&state). */