1 /* Convert multibyte character to wide character.
2 Copyright (C) 1999-2002, 2005-2021 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2008.
4
5 This file is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
9
10 This file 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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17
18 #include <config.h>
19
20 /* Specification. */
21 #include <wchar.h>
22
23 #if GNULIB_defined_mbstate_t
24 /* Implement mbrtowc() on top of mbtowc() for the non-UTF-8 locales
25 and directly for the UTF-8 locales. */
26
27 # include <errno.h>
28 # include <stdint.h>
29 # include <stdlib.h>
30
31 # if defined _WIN32 && !defined __CYGWIN__
32
33 # define WIN32_LEAN_AND_MEAN /* avoid including junk */
34 # include <windows.h>
35
36 # elif HAVE_PTHREAD_API
37
38 # include <pthread.h>
39 # if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
40 # include <threads.h>
41 # pragma weak thrd_exit
42 # define c11_threads_in_use() (thrd_exit != NULL)
43 # else
44 # define c11_threads_in_use() 0
45 # endif
46
47 # elif HAVE_THREADS_H
48
49 # include <threads.h>
50
51 # endif
52
53 # include "attribute.h"
54 # include "verify.h"
55 # include "lc-charset-dispatch.h"
56 # include "mbtowc-lock.h"
57
58 verify (sizeof (mbstate_t) >= 4);
59 static char internal_state[4];
60
61 size_t
62 mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
63 {
64 # define FITS_IN_CHAR_TYPE(wc) ((wc) <= WCHAR_MAX)
65 # include "mbrtowc-impl.h"
66 }
67
68 #else
69 /* Override the system's mbrtowc() function. */
70
71 # if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
72 # include "hard-locale.h"
73 # include <locale.h>
74 # endif
75
76 # undef mbrtowc
77
78 size_t
79 rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
80 {
81 size_t ret;
82 wchar_t wc;
83
84 # if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG || MBRTOWC_EMPTY_INPUT_BUG
85 if (s == NULL)
86 {
87 pwc = NULL;
88 s = "";
89 n = 1;
90 }
91 # endif
92
93 # if MBRTOWC_EMPTY_INPUT_BUG
94 if (n == 0)
95 return (size_t) -2;
96 # endif
97
98 if (! pwc)
99 pwc = &wc;
100
101 # if MBRTOWC_RETVAL_BUG
102 {
103 static mbstate_t internal_state;
104
105 /* Override mbrtowc's internal state. We cannot call mbsinit() on the
106 hidden internal state, but we can call it on our variable. */
107 if (ps == NULL)
108 ps = &internal_state;
109
110 if (!mbsinit (ps))
111 {
112 /* Parse the rest of the multibyte character byte for byte. */
113 size_t count = 0;
114 for (; n > 0; s++, n--)
115 {
116 ret = mbrtowc (&wc, s, 1, ps);
117
118 if (ret == (size_t)(-1))
119 return (size_t)(-1);
120 count++;
121 if (ret != (size_t)(-2))
122 {
123 /* The multibyte character has been completed. */
124 *pwc = wc;
125 return (wc == 0 ? 0 : count);
126 }
127 }
128 return (size_t)(-2);
129 }
130 }
131 # endif
132
133 # if MBRTOWC_STORES_INCOMPLETE_BUG
134 ret = mbrtowc (&wc, s, n, ps);
135 if (ret < (size_t) -2 && pwc != NULL)
136 *pwc = wc;
137 # else
138 ret = mbrtowc (pwc, s, n, ps);
139 # endif
140
141 # if MBRTOWC_NUL_RETVAL_BUG
142 if (ret < (size_t) -2 && !*pwc)
143 return 0;
144 # endif
145
146 # if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
147 if ((size_t) -2 <= ret && n != 0 && ! hard_locale (LC_CTYPE))
148 {
149 unsigned char uc = *s;
150 *pwc = uc;
151 return 1;
152 }
153 # endif
154
155 return ret;
156 }
157
158 #endif