1 /* Convert string to wide string.
2 Copyright (C) 2008-2018 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 <https://www.gnu.org/licenses/>. */
19 mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps)
22 ps = &_gl_mbsrtowcs_state;
24 const char *src = *srcp;
28 wchar_t *destptr = dest;
30 for (; len > 0; destptr++, len--)
35 /* An optimized variant of
36 src_avail = strnlen1 (src, MB_LEN_MAX); */
39 else if (src[1] == '\0')
41 else if (src[2] == '\0')
43 else if (MB_LEN_MAX <= 4 || src[3] == '\0')
46 src_avail = 4 + strnlen1 (src + 4, 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). */
68 return destptr - dest;
72 /* Ignore dest and len, don't store *srcp at the end, and
74 mbstate_t state = *ps;
75 size_t totalcount = 0;
82 /* An optimized variant of
83 src_avail = strnlen1 (src, MB_LEN_MAX); */
86 else if (src[1] == '\0')
88 else if (src[2] == '\0')
90 else if (MB_LEN_MAX <= 4 || src[3] == '\0')
93 src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4);
95 /* Parse the next multibyte character. */
96 ret = mbrtowc (NULL, src, src_avail, &state);
98 if (ret == (size_t)(-2))
99 /* Encountered a multibyte character that extends past a '\0' byte
100 or that is longer than MB_LEN_MAX bytes. Cannot happen. */
103 if (ret == (size_t)(-1))
107 /* Here mbsinit (&state). */