xref: /titanic_51/usr/src/cmd/mandoc/compat_fgetln.c (revision 260e9a87725c090ba5835b1f9f0b62fa2f96036f)
1 #include "config.h"
2 
3 #if HAVE_FGETLN
4 
5 int dummy;
6 
7 #else
8 
9 /*	$NetBSD: fgetln.c,v 1.3 2006/09/25 07:18:17 lukem Exp $	*/
10 
11 /*-
12  * Copyright (c) 1998 The NetBSD Foundation, Inc.
13  * All rights reserved.
14  *
15  * This code is derived from software contributed to The NetBSD Foundation
16  * by Christos Zoulas.
17  *
18  * Redistribution and use in source and binary forms, with or without
19  * modification, are permitted provided that the following conditions
20  * are met:
21  * 1. Redistributions of source code must retain the above copyright
22  *    notice, this list of conditions and the following disclaimer.
23  * 2. Redistributions in binary form must reproduce the above copyright
24  *    notice, this list of conditions and the following disclaimer in the
25  *    documentation and/or other materials provided with the distribution.
26  * 3. Neither the name of The NetBSD Foundation nor the names of its
27  *    contributors may be used to endorse or promote products derived
28  *    from this software without specific prior written permission.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
31  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
32  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
33  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
34  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
35  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
36  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
37  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
38  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
40  * POSSIBILITY OF SUCH DAMAGE.
41  */
42 
43 #include <sys/types.h>
44 
45 #include <errno.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 
50 char *
51 fgetln(fp, len)
52 	FILE *fp;
53 	size_t *len;
54 {
55 	static char *buf = NULL;
56 	static size_t bufsiz = 0;
57 	char *ptr;
58 
59 
60 	if (buf == NULL) {
61 		bufsiz = BUFSIZ;
62 		if ((buf = malloc(bufsiz)) == NULL)
63 			return NULL;
64 	}
65 
66 	if (fgets(buf, bufsiz, fp) == NULL)
67 		return NULL;
68 
69 	*len = 0;
70 	while ((ptr = strchr(&buf[*len], '\n')) == NULL) {
71 		size_t nbufsiz = bufsiz + BUFSIZ;
72 		char *nbuf = realloc(buf, nbufsiz);
73 
74 		if (nbuf == NULL) {
75 			int oerrno = errno;
76 			free(buf);
77 			errno = oerrno;
78 			buf = NULL;
79 			return NULL;
80 		} else
81 			buf = nbuf;
82 
83 		*len = bufsiz;
84 		if (fgets(&buf[bufsiz], BUFSIZ, fp) == NULL)
85 			return buf;
86 
87 		bufsiz = nbufsiz;
88 	}
89 
90 	*len = (ptr - buf) + 1;
91 	return buf;
92 }
93 
94 #endif
95