130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/* Copyright (C) 1996-2022 Free Software Foundation, Inc.
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Copyright The GNU Toolchain Authors.
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This file is part of the GNU C Library.
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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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<https://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 <stdlib.h>
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#include <string.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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__wcrtomb_internal (char *s, wchar_t wc, mbstate_t *ps, size_t s_size)
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{
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char buf[MB_LEN_MAX];
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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 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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wc = L'\0';
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/* Tell where we want to have the result. */
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data.__outbuf = (unsigned char *) buf;
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data.__outbufend = (unsigned char *) buf + sizeof buf;
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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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__gconv_fct fct = fcts->tomb->__fct;
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#ifdef PTR_DEMANGLE
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if (fcts->tomb->__shlib_handle != NULL)
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PTR_DEMANGLE (fct);
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#endif
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/* If WC is the NUL character we write into the output buffer the byte
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sequence necessary for PS to get into the initial state, followed
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by a NUL byte. */
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if (wc == L'\0')
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{
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status = DL_CALL_FCT (fct, (fcts->tomb, &data, NULL, NULL,
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NULL, &dummy, 1, 1));
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if (status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
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*data.__outbuf++ = '\0';
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}
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else
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{
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/* Do a normal conversion. */
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const unsigned char *inbuf = (const unsigned char *) &wc;
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status = DL_CALL_FCT (fct,
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(fcts->tomb, &data, &inbuf,
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inbuf + sizeof (wchar_t), NULL, &dummy, 0, 1));
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}
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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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result = data.__outbuf - (unsigned char *) buf;
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if (s != NULL)
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{
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if (result > s_size)
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__chk_fail ();
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memcpy (s, buf, result);
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}
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}
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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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size_t
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__wcrtomb (char *s, wchar_t wc, mbstate_t *ps)
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{
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return __wcrtomb_internal (s, wc, ps, (size_t) -1);
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}
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weak_alias (__wcrtomb, wcrtomb)
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libc_hidden_weak (wcrtomb)
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