1/*
2 * Copyright �� 2005 Hector Garcia Alvarez
3 * Copyright �� 2005, 2008-2012 Guillem Jover <guillem@hadrons.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <stdio.h>
29
30#include <sys/types.h>
31#include <string.h>
32
33#include "local-link.h"
34
35#define HAVE_GETLINE 1
36#ifdef HAVE_GETLINE
37struct filebuf {
38	FILE *fp;
39	char *buf;
40	size_t len;
41};
42
43#define FILEBUF_POOL_ITEMS 32
44
45static struct filebuf fb_pool[FILEBUF_POOL_ITEMS];
46static int fb_pool_cur;
47
48char *
49fgetln(FILE *stream, size_t *len)
50{
51	struct filebuf *fb;
52	ssize_t nread;
53
54	flockfile(stream);
55
56	/* Try to diminish the possibility of several fgetln() calls being
57	 * used on different streams, by using a pool of buffers per file. */
58	fb = &fb_pool[fb_pool_cur];
59	if (fb->fp != stream && fb->fp != NULL) {
60		fb_pool_cur++;
61		fb_pool_cur %= FILEBUF_POOL_ITEMS;
62		fb = &fb_pool[fb_pool_cur];
63	}
64	fb->fp = stream;
65
66	nread = getline(&fb->buf, &fb->len, stream);
67
68	funlockfile(stream);
69
70	/* Note: the getdelim/getline API ensures nread != 0. */
71	if (nread == -1) {
72		*len = 0;
73		return NULL;
74	} else {
75		*len = (size_t)nread;
76		return fb->buf;
77	}
78}
79libbsd_link_warning(fgetln,
80                    "This function cannot be safely ported, use getline(3) "
81                    "instead, as it is supported by GNU and POSIX.1-2008.")
82#else
83#error "Function fgetln() needs to be ported."
84#endif
85