1/* $NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $	*/
2
3/*
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 *
6 * This code is derived from software contributed to The NetBSD Foundation
7 * by Roy Marples.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__RCSID("$NetBSD: fgetstr.c,v 1.12 2017/06/08 15:59:45 uwe Exp $");
32
33#include "namespace.h"
34
35#include <assert.h>
36#include <errno.h>
37#include <limits.h>
38#include <stdio.h>
39
40#include "reentrant.h"
41#include "local.h"
42
43/*
44 * Get an input line.
45 * This now uses getdelim(3) for a code reduction.
46 * The upside is that strings are now always null-terminated, but relying
47 * on this is non portable - better to use the POSIX getdelim(3) function.
48 */
49char *
50__fgetstr(FILE *__restrict fp, size_t *__restrict lenp, int sep)
51{
52	ssize_t n;
53
54	_DIAGASSERT(fp != NULL);
55	_DIAGASSERT(lenp != NULL);
56
57	n = __getdelim(&_EXT(fp)->_fgetstr_buf, &_EXT(fp)->_fgetstr_len, sep, fp);
58	if (n == -1) {
59		*lenp = 0;
60		if (__sferror(fp) && errno == EOVERFLOW) /* fixup errno */
61			errno = EINVAL;
62		return NULL;
63	}
64	*lenp = n;
65	return _EXT(fp)->_fgetstr_buf;
66}
67