1 /* Convert string to wide string.
2 Copyright (C) 2008-2012 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/>. */
19 mbsnrtowcs (wchar_t *dest, const char **srcp, size_t srclen, size_t len, mbstate_t *ps)
22 ps = &_gl_mbsrtowcs_state;
24 const char *src = *srcp;
28 wchar_t *destptr = dest;
30 for (; srclen > 0 && len > 0; destptr++, len--)
35 /* An optimized variant of
36 src_avail = strnlen1 (src, MIN (srclen, MB_LEN_MAX)); */
37 if (srclen == 1 || src[0] == '\0')
39 else if (srclen == 2 || src[1] == '\0')
41 else if (srclen == 3 || src[2] == '\0')
43 else if (MB_LEN_MAX <= 4 || srclen == 4 || src[3] == '\0')
46 src_avail = 4 + strnlen1 (src + 4, MIN (srclen, MB_LEN_MAX) - 4);
48 /* Parse the next multibyte character. */
49 ret = mbrtowc (destptr, src, src_avail, ps);
51 if (ret == (size_t)(-2))
52 /* Encountered a multibyte character that extends past a '\0' byte
53 or that is longer than MB_LEN_MAX bytes. Cannot happen. */
56 if (ret == (size_t)(-1))
61 /* Here mbsinit (ps). */
69 return destptr - dest;
73 /* Ignore dest and len, don't store *srcp at the end, and
75 mbstate_t state = *ps;
76 size_t totalcount = 0;
78 for (; srclen > 0; totalcount++)
83 /* An optimized variant of
84 src_avail = strnlen1 (src, MIN (srclen, MB_LEN_MAX)); */
85 if (srclen == 1 || src[0] == '\0')
87 else if (srclen == 2 || src[1] == '\0')
89 else if (srclen == 3 || src[2] == '\0')
91 else if (MB_LEN_MAX <= 4 || srclen == 4 || src[3] == '\0')
94 src_avail = 4 + strnlen1 (src + 4, MIN (srclen, MB_LEN_MAX) - 4);
96 /* Parse the next multibyte character. */
97 ret = mbrtowc (NULL, src, src_avail, &state);
99 if (ret == (size_t)(-2))
100 /* Encountered a multibyte character that extends past a '\0' byte
101 or that is longer than MB_LEN_MAX bytes. Cannot happen. */
104 if (ret == (size_t)(-1))
108 /* Here mbsinit (&state). */