| 1 | /* Convert multibyte character to wide character. |
| 2 | Copyright (C) 1999-2002, 2005-2020 Free Software Foundation, Inc. |
| 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 |
| 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 "verify.h" |
| 54 | # include "lc-charset-dispatch.h" |
| 55 | # include "mbtowc-lock.h" |
| 56 | |
| 57 | # ifndef FALLTHROUGH |
| 58 | # if __GNUC__ < 7 |
| 59 | # define FALLTHROUGH ((void) 0) |
| 60 | # else |
| 61 | # define FALLTHROUGH __attribute__ ((__fallthrough__)) |
| 62 | # endif |
| 63 | # endif |
| 64 | |
| 65 | verify (sizeof (mbstate_t) >= 4); |
| 66 | static char internal_state[4]; |
| 67 | |
| 68 | size_t |
| 69 | mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps) |
| 70 | { |
| 71 | # define FITS_IN_CHAR_TYPE(wc) ((wc) <= WCHAR_MAX) |
| 72 | # include "mbrtowc-impl.h" |
| 73 | } |
| 74 | |
| 75 | #else |
| 76 | /* Override the system's mbrtowc() function. */ |
| 77 | |
| 78 | # if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ |
| 79 | # include "hard-locale.h" |
| 80 | # include <locale.h> |
| 81 | # endif |
| 82 | |
| 83 | # undef mbrtowc |
| 84 | |
| 85 | size_t |
| 86 | rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps) |
| 87 | { |
| 88 | size_t ret; |
| 89 | wchar_t wc; |
| 90 | |
| 91 | # if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG || MBRTOWC_EMPTY_INPUT_BUG |
| 92 | if (s == NULL) |
| 93 | { |
| 94 | pwc = NULL; |
| 95 | s = ""; |
| 96 | n = 1; |
| 97 | } |
| 98 | # endif |
| 99 | |
| 100 | # if MBRTOWC_EMPTY_INPUT_BUG |
| 101 | if (n == 0) |
| 102 | return (size_t) -2; |
| 103 | # endif |
| 104 | |
| 105 | if (! pwc) |
| 106 | pwc = &wc; |
| 107 | |
| 108 | # if MBRTOWC_RETVAL_BUG |
| 109 | { |
| 110 | static mbstate_t internal_state; |
| 111 | |
| 112 | /* Override mbrtowc's internal state. We cannot call mbsinit() on the |
| 113 | hidden internal state, but we can call it on our variable. */ |
| 114 | if (ps == NULL) |
| 115 | ps = &internal_state; |
| 116 | |
| 117 | if (!mbsinit (ps)) |
| 118 | { |
| 119 | /* Parse the rest of the multibyte character byte for byte. */ |
| 120 | size_t count = 0; |
| 121 | for (; n > 0; s++, n--) |
| 122 | { |
| 123 | ret = mbrtowc (&wc, s, 1, ps); |
| 124 | |
| 125 | if (ret == (size_t)(-1)) |
| 126 | return (size_t)(-1); |
| 127 | count++; |
| 128 | if (ret != (size_t)(-2)) |
| 129 | { |
| 130 | /* The multibyte character has been completed. */ |
| 131 | *pwc = wc; |
| 132 | return (wc == 0 ? 0 : count); |
| 133 | } |
| 134 | } |
| 135 | return (size_t)(-2); |
| 136 | } |
| 137 | } |
| 138 | # endif |
| 139 | |
| 140 | # if MBRTOWC_STORES_INCOMPLETE_BUG |
| 141 | ret = mbrtowc (&wc, s, n, ps); |
| 142 | if (ret < (size_t) -2 && pwc != NULL) |
| 143 | *pwc = wc; |
| 144 | # else |
| 145 | ret = mbrtowc (pwc, s, n, ps); |
| 146 | # endif |
| 147 | |
| 148 | # if MBRTOWC_NUL_RETVAL_BUG |
| 149 | if (ret < (size_t) -2 && !*pwc) |
| 150 | return 0; |
| 151 | # endif |
| 152 | |
| 153 | # if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ |
| 154 | if ((size_t) -2 <= ret && n != 0 && ! hard_locale (LC_CTYPE)) |
| 155 | { |
| 156 | unsigned char uc = *s; |
| 157 | *pwc = uc; |
| 158 | return 1; |
| 159 | } |
| 160 | # endif |
| 161 | |
| 162 | return ret; |
| 163 | } |
| 164 | |
| 165 | #endif |