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130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/* Copyright (C) 1996-2017 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <dlfcn.h>
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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 <sysdep.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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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, *endbuf;
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unsigned char *outbuf = (unsigned char *) (pwc ?: buf);
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const struct gconv_fcts *fcts;
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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.__flags = __GCONV_IS_LAST;
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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 = (unsigned char *) buf;
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s = "";
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n = 1;
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}
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if (n == 0)
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return (size_t) -2;
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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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/* Get the conversion functions. */
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fcts = get_gconv_fcts (_NL_CURRENT_DATA (LC_CTYPE));
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/* Do a normal conversion. */
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inbuf = (const unsigned char *) s;
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endbuf = inbuf + n;
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if (__glibc_unlikely (endbuf < inbuf))
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{
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endbuf = (const unsigned char *) ~(uintptr_t) 0;
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if (endbuf == inbuf)
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goto ilseq;
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}
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__gconv_fct fct = fcts->towc->__fct;
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#ifdef PTR_DEMANGLE
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if (fcts->towc->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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status = DL_CALL_FCT (fct, (fcts->towc, &data, &inbuf, endbuf,
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NULL, &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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ilseq:
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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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libc_hidden_def (__mbrtowc)
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weak_alias (__mbrtowc, mbrtowc)
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libc_hidden_weak (mbrtowc)
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/* There should be no difference between the UTF-32 handling required
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by mbrtoc32 and the wchar_t handling which has long since been
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implemented in mbrtowc. */
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weak_alias (__mbrtowc, mbrtoc32)
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