157 lines
3.6 KiB
C
157 lines
3.6 KiB
C
/* Convert multibyte character to wide character.
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Copyright (C) 1999-2002, 2005-2023 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2008.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <wchar.h>
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#if GNULIB_defined_mbstate_t
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/* Implement mbrtowc() on top of mbtowc() for the non-UTF-8 locales
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and directly for the UTF-8 locales. */
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# include <errno.h>
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# include <stdint.h>
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# include <stdlib.h>
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# if defined _WIN32 && !defined __CYGWIN__
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */
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# include <windows.h>
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# elif HAVE_PTHREAD_API
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# include <pthread.h>
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# if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
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# include <threads.h>
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# pragma weak thrd_exit
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# define c11_threads_in_use() (thrd_exit != NULL)
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# else
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# define c11_threads_in_use() 0
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# endif
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# elif HAVE_THREADS_H
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# include <threads.h>
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# endif
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# include "attribute.h"
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# include "lc-charset-dispatch.h"
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# include "mbtowc-lock.h"
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static_assert (sizeof (mbstate_t) >= 4);
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static char internal_state[4];
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size_t
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mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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{
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# define FITS_IN_CHAR_TYPE(wc) ((wc) <= WCHAR_MAX)
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# include "mbrtowc-impl.h"
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}
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#else
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/* Override the system's mbrtowc() function. */
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# if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
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# include "hard-locale.h"
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# include <locale.h>
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# endif
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# undef mbrtowc
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size_t
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rpl_mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
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{
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size_t ret;
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wchar_t wc;
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# if MBRTOWC_NULL_ARG2_BUG || MBRTOWC_RETVAL_BUG || MBRTOWC_EMPTY_INPUT_BUG
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if (s == NULL)
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{
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pwc = NULL;
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s = "";
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n = 1;
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}
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# endif
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# if MBRTOWC_EMPTY_INPUT_BUG
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if (n == 0)
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return (size_t) -2;
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# endif
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if (! pwc)
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pwc = &wc;
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# if MBRTOWC_RETVAL_BUG
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{
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static mbstate_t internal_state;
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/* Override mbrtowc's internal state. We cannot call mbsinit() on the
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hidden internal state, but we can call it on our variable. */
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if (ps == NULL)
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ps = &internal_state;
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if (!mbsinit (ps))
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{
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/* Parse the rest of the multibyte character byte for byte. */
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size_t count = 0;
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for (; n > 0; s++, n--)
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{
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ret = mbrtowc (&wc, s, 1, ps);
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if (ret == (size_t)(-1))
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return (size_t)(-1);
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count++;
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if (ret != (size_t)(-2))
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{
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/* The multibyte character has been completed. */
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*pwc = wc;
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return (wc == 0 ? 0 : count);
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}
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}
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return (size_t)(-2);
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}
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}
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# endif
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# if MBRTOWC_STORES_INCOMPLETE_BUG
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ret = mbrtowc (&wc, s, n, ps);
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if (ret < (size_t) -2 && pwc != NULL)
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*pwc = wc;
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# else
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ret = mbrtowc (pwc, s, n, ps);
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# endif
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# if MBRTOWC_NUL_RETVAL_BUG
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if (ret < (size_t) -2 && !*pwc)
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return 0;
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# endif
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# if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
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if ((size_t) -2 <= ret && n != 0 && ! hard_locale (LC_CTYPE))
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{
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unsigned char uc = *s;
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*pwc = uc;
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return 1;
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}
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# endif
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return ret;
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}
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#endif
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