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1999-04-19 Ulrich Drepper <drepper@cygnus.com> * wcsmbs/mbsnrtowcs.c (__mbsnrtowcs): Correctly initialize outbufend for dst==NULL.
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999 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 <string.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 NMC bytes will be converted. */
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size_t
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__mbsnrtowcs (dst, src, nmc, len, ps)
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wchar_t *dst;
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const char **src;
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size_t nmc;
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size_t len;
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mbstate_t *ps;
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{
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const unsigned char *srcend;
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struct gconv_step_data data;
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size_t result = 0;
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int status;
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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.is_last = 1;
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data.statep = ps ?: &state;
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if (nmc == 0)
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return 0;
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srcend = *src + __strnlen (*src, nmc - 1) + 1;
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/* Make sure we use the correct function. */
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update_conversion_ptrs ();
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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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wchar_t buf[64]; /* Just an arbitrary size. */
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const unsigned char *inbuf = *src;
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data.outbufend = (char *) buf + sizeof (buf);
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do
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{
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data.outbuf = (char *) buf;
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status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
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&data, &inbuf, srcend,
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&result, 0);
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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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&& ((wchar_t *) data.outbuf)[-1] == L'\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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data.outbuf = (unsigned char *) dst;
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data.outbufend = data.outbuf + len * sizeof (wchar_t);
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status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc,
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&data,
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(const unsigned char **) src,
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srcend, &result, 0);
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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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&& ((wchar_t *) dst)[result - 1] == L'\0')
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{
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assert (result > 0);
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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 || 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 (__mbsnrtowcs, mbsnrtowcs)
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