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8690e634 | 1 | /* Convert string to wide string. |
7a6dbc2f | 2 | Copyright (C) 2008-2018 Free Software Foundation, Inc. |
8690e634 JK |
3 | Written by Bruno Haible <bruno@clisp.org>, 2008. |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
7a6dbc2f | 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
8690e634 JK |
17 | |
18 | size_t | |
19 | mbsrtowcs (wchar_t *dest, const char **srcp, size_t len, mbstate_t *ps) | |
20 | { | |
21 | if (ps == NULL) | |
22 | ps = &_gl_mbsrtowcs_state; | |
23 | { | |
24 | const char *src = *srcp; | |
25 | ||
26 | if (dest != NULL) | |
27 | { | |
28 | wchar_t *destptr = dest; | |
29 | ||
30 | for (; len > 0; destptr++, len--) | |
31 | { | |
32 | size_t src_avail; | |
33 | size_t ret; | |
34 | ||
35 | /* An optimized variant of | |
36 | src_avail = strnlen1 (src, MB_LEN_MAX); */ | |
37 | if (src[0] == '\0') | |
38 | src_avail = 1; | |
39 | else if (src[1] == '\0') | |
40 | src_avail = 2; | |
41 | else if (src[2] == '\0') | |
42 | src_avail = 3; | |
43 | else if (MB_LEN_MAX <= 4 || src[3] == '\0') | |
44 | src_avail = 4; | |
45 | else | |
46 | src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4); | |
47 | ||
48 | /* Parse the next multibyte character. */ | |
49 | ret = mbrtowc (destptr, src, src_avail, ps); | |
50 | ||
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. */ | |
54 | abort (); | |
55 | ||
56 | if (ret == (size_t)(-1)) | |
57 | goto bad_input; | |
58 | if (ret == 0) | |
59 | { | |
60 | src = NULL; | |
61 | /* Here mbsinit (ps). */ | |
62 | break; | |
63 | } | |
64 | src += ret; | |
65 | } | |
66 | ||
67 | *srcp = src; | |
68 | return destptr - dest; | |
69 | } | |
70 | else | |
71 | { | |
72 | /* Ignore dest and len, don't store *srcp at the end, and | |
73 | don't clobber *ps. */ | |
74 | mbstate_t state = *ps; | |
75 | size_t totalcount = 0; | |
76 | ||
77 | for (;; totalcount++) | |
78 | { | |
79 | size_t src_avail; | |
80 | size_t ret; | |
81 | ||
82 | /* An optimized variant of | |
83 | src_avail = strnlen1 (src, MB_LEN_MAX); */ | |
84 | if (src[0] == '\0') | |
85 | src_avail = 1; | |
86 | else if (src[1] == '\0') | |
87 | src_avail = 2; | |
88 | else if (src[2] == '\0') | |
89 | src_avail = 3; | |
90 | else if (MB_LEN_MAX <= 4 || src[3] == '\0') | |
91 | src_avail = 4; | |
92 | else | |
93 | src_avail = 4 + strnlen1 (src + 4, MB_LEN_MAX - 4); | |
94 | ||
95 | /* Parse the next multibyte character. */ | |
96 | ret = mbrtowc (NULL, src, src_avail, &state); | |
97 | ||
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. */ | |
101 | abort (); | |
102 | ||
103 | if (ret == (size_t)(-1)) | |
104 | goto bad_input2; | |
105 | if (ret == 0) | |
106 | { | |
107 | /* Here mbsinit (&state). */ | |
108 | break; | |
109 | } | |
110 | src += ret; | |
111 | } | |
112 | ||
113 | return totalcount; | |
114 | } | |
115 | ||
116 | bad_input: | |
117 | *srcp = src; | |
118 | bad_input2: | |
119 | errno = EILSEQ; | |
120 | return (size_t)(-1); | |
121 | } | |
122 | } |