minix/lib/nbsd_libc/stdio/fgetstr.c

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/* $NetBSD: fgetstr.c,v 1.11 2010/01/11 20:39:29 joerg Exp $ */
/*
* Copyright (c) 2009 The NetBSD Foundation, Inc.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Roy Marples.
*
* 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 ``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 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>
__RCSID("$NetBSD: fgetstr.c,v 1.11 2010/01/11 20:39:29 joerg Exp $");
#include "namespace.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include "reentrant.h"
#include "local.h"
/*
* Get an input line.
* This now uses getdelim(3) for a code reduction.
* The upside is that strings are now always NULL terminated, but relying
* on this is non portable - better to use the POSIX getdelim(3) function.
*/
char *
__fgetstr(FILE *__restrict fp, size_t *__restrict lenp, int sep)
{
ssize_t n;
_DIAGASSERT(fp != NULL);
_DIAGASSERT(lenp != NULL);
n = __getdelim(&_EXT(fp)->_fgetstr_buf, &_EXT(fp)->_fgetstr_len, sep, fp);
if (n == -1) {
*lenp = 0;
if (__sferror(fp) && errno == EOVERFLOW) /* fixup errno */
errno = EINVAL;
return NULL;
}
*lenp = n;
return _EXT(fp)->_fgetstr_buf;
}