147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/* Copyright (C) 1996-2000, 2002, 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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 <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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/* This is a non-standard function but it is very useful in the
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implementation of stdio because we have to deal with unterminated
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buffers. At most NWC wide character will be converted. */
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size_t
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__wcsnrtombs (dst, src, nwc, len, ps)
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char *dst;
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const wchar_t **src;
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size_t nwc;
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size_t len;
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mbstate_t *ps;
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{
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struct __gconv_step_data data;
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const wchar_t *srcend;
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int status;
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size_t result;
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struct __gconv_step *tomb;
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const struct gconv_fcts *fcts;
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/* Tell where we want the result. */
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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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data.__trans = NULL;
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if (nwc == 0)
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return 0;
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srcend = *src + __wcsnlen (*src, nwc - 1) + 1;
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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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/* Get the structure with the function pointers. */
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tomb = fcts->tomb;
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/* We have to handle DST == NULL special. */
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if (dst == NULL)
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{
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unsigned char buf[256]; /* Just an arbitrary value. */
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const unsigned char *inbuf = (const unsigned char *) *src;
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size_t dummy;
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result = 0;
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data.__outbufend = buf + sizeof (buf);
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do
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{
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data.__outbuf = buf;
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status = DL_CALL_FCT (tomb->__fct,
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(tomb, &data, &inbuf,
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(const unsigned char *) srcend, NULL,
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&dummy, 0, 1));
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/* Count the number of bytes. */
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result += data.__outbuf - buf;
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}
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while (status == __GCONV_FULL_OUTPUT);
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if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
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&& data.__outbuf[-1] == '\0')
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/* Don't count the NUL character in. */
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--result;
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}
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else
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{
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/* This code is based on the safe assumption that all internal
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multi-byte encodings use the NUL byte only to mark the end
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of the string. */
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size_t dummy;
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data.__outbuf = dst;
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data.__outbufend = dst + len;
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status = DL_CALL_FCT (tomb->__fct,
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(tomb, &data, (const unsigned char **) src,
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(const unsigned char *) srcend, NULL,
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&dummy, 0, 1));
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/* Count the number of bytes. */
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result = data.__outbuf - (unsigned char *) dst;
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/* We have to determine whether the last character converted
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is the NUL character. */
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if ((status == __GCONV_OK || status == __GCONV_EMPTY_INPUT)
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&& data.__outbuf[-1] == '\0')
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{
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assert (data.__outbuf != (unsigned char *) dst);
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assert (__mbsinit (data.__statep));
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*src = NULL;
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--result;
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}
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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. */
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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_FULL_OUTPUT
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&& status != __GCONV_EMPTY_INPUT)
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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 (__wcsnrtombs, wcsnrtombs)
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