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/* $NetBSD: fgetwln.c,v 1.5 2012/03/15 18:22:30 christos Exp $ */
/*-
* Copyright (c) 2002-2004 Tim J. Robbins.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
__FBSDID("$FreeBSD: src/lib/libc/stdio/fgetwln.c,v 1.2 2004/08/06 17:00:09 tjr Exp $");
#else
__RCSID("$NetBSD: fgetwln.c,v 1.5 2012/03/15 18:22:30 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "reentrant.h"
#include "local.h"
#ifdef __weak_alias
__weak_alias(fgetwln,_fgetwln)
#endif
/*
* Expand the line buffer. Return -1 on error.
#ifdef notdef
* The `new size' does not account for a terminating '\0',
* so we add 1 here.
#endif
*/
static int
__slbexpand(FILE *fp, size_t newsize)
{
void *p;
#ifdef notdef
++newsize;
#endif
_DIAGASSERT(fp != NULL);
if (_EXT(fp)->_fgetstr_len >= newsize)
return 0;
if ((p = realloc(_EXT(fp)->_fgetstr_buf, newsize)) == NULL)
return -1;
_EXT(fp)->_fgetstr_buf = p;
_EXT(fp)->_fgetstr_len = newsize;
return 0;
}
wchar_t *
fgetwln(FILE * __restrict fp, size_t *lenp)
{
wint_t wc;
size_t len;
FLOCKFILE(fp);
_SET_ORIENTATION(fp, 1);
len = 0;
while ((wc = __fgetwc_unlock(fp)) != WEOF) {
#define GROW 512
if (len * sizeof(wchar_t) >= _EXT(fp)->_fgetstr_len &&
__slbexpand(fp, (len + GROW) * sizeof(wchar_t)))
goto error;
*((wchar_t *)(void *)_EXT(fp)->_fgetstr_buf + len++) = wc;
if (wc == L'\n')
break;
}
if (len == 0)
goto error;
FUNLOCKFILE(fp);
*lenp = len;
return (wchar_t *)(void *)_EXT(fp)->_fgetstr_buf;
error:
FUNLOCKFILE(fp);
*lenp = 0;
return NULL;
}
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