109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.org>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <gconv.h>
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#include <wchar.h>
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#include <wcsmbsload.h>
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#include <assert.h>
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#ifndef EILSEQ
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# define EILSEQ EINVAL
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#endif
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/* This is the private state used if PS is NULL. */
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static mbstate_t state;
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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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mbstate_t temp_state;
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wchar_t buf[1];
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struct __gconv_step_data data;
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int status;
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size_t result;
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size_t dummy;
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const unsigned char *inbuf;
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char *outbuf = (char *) (pwc ?: buf);
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/* Set information for this step. */
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data.__invocation_counter = 0;
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data.__internal_use = 1;
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data.__is_last = 1;
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data.__statep = ps ?: &state;
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/* A first special case is if S is NULL. This means put PS in the
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initial state. */
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if (s == NULL)
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{
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outbuf = (char *) buf;
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s = "";
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n = 1;
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temp_state = *data.__statep;
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data.__statep = &temp_state;
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}
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/* Tell where we want the result. */
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data.__outbuf = outbuf;
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data.__outbufend = outbuf + sizeof (wchar_t);
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/* Make sure we use the correct function. */
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update_conversion_ptrs ();
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/* Do a normal conversion. */
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inbuf = (const unsigned char *) s;
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status = (*__wcsmbs_gconv_fcts.towc->__fct) (__wcsmbs_gconv_fcts.towc,
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&data, &inbuf, inbuf + n,
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&dummy, 0, 1);
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/* There must not be any problems with the conversion but illegal input
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characters. The output buffer must be large enough, otherwise the
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definition of MB_CUR_MAX is not correct. All the other possible
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errors also must not happen. */
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assert (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
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|| status == __GCONV_ILLEGAL_INPUT
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|| status == __GCONV_INCOMPLETE_INPUT
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|| status == __GCONV_FULL_OUTPUT);
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if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT
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|| status == __GCONV_FULL_OUTPUT)
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{
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if (data.__outbuf != (unsigned char *) outbuf
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&& *(wchar_t *) outbuf == L'\0')
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{
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/* The converted character is the NUL character. */
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assert (__mbsinit (data.__statep));
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result = 0;
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}
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else
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result = inbuf - (const unsigned char *) s;
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}
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else if (status == __GCONV_INCOMPLETE_INPUT)
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result = (size_t) -2;
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else
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{
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result = (size_t) -1;
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__set_errno (EILSEQ);
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}
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return result;
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}
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weak_alias (__mbrtowc, mbrtowc)
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