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/* $OpenBSD: fgetwln.c,v 1.4 2016/08/27 12:08:38 schwarze 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 <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include "local.h"
/*
* Expand the line buffer. Return -1 on error.
*/
static int
__slbexpand(FILE *fp, size_t newsize)
{
void *p;
if (fp->_lb._size / sizeof(wchar_t) >= newsize)
return 0;
if ((p = reallocarray(fp->_lb._base, newsize, sizeof(wchar_t))) == NULL)
return -1;
fp->_lb._base = p;
fp->_lb._size = newsize * sizeof(wchar_t);
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 >= fp->_lb._size / sizeof(wchar_t) &&
__slbexpand(fp, len + GROW)) {
fp->_flags |= __SERR;
goto error;
}
*((wchar_t *)fp->_lb._base + len++) = wc;
if (wc == L'\n')
break;
}
/*
* The following test assumes that fgetwc() fails when
* feof() is already set, and that fgetwc() will never
* set feof() in the same call where it also sets ferror()
* or returns non-WEOF.
* Testing ferror() would not be better because fgetwc()
* may succeed even when ferror() is already set.
*/
if (len == 0 || (wc == WEOF && !__sfeof(fp)))
goto error;
FUNLOCKFILE(fp);
*lenp = len;
return (wchar_t *)fp->_lb._base;
error:
FUNLOCKFILE(fp);
*lenp = 0;
return NULL;
}
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