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
37 struct filebuf {
38 FILE *fp;
39 char *buf;
40 size_t len;
41 };
42
43 #define FILEBUF_POOL_ITEMS 32
44
45 static struct filebuf fb_pool[FILEBUF_POOL_ITEMS];
46 static int fb_pool_cur;
47
48 char *
fgetln(FILE * stream,size_t * len)49 fgetln(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 }
79 libbsd_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