1 /*	$NetBSD: getline.c,v 1.1.1.6 2015/01/02 20:34:27 christos Exp $	*/
2 
3 /*	NetBSD: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp 	*/
4 
5 /*-
6  * Copyright (c) 2011 The NetBSD Foundation, Inc.
7  * All rights reserved.
8  *
9  * This code is derived from software contributed to The NetBSD Foundation
10  * by Christos Zoulas.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31  * POSSIBILITY OF SUCH DAMAGE.
32  */
33 
34 /* NETBSD ORIGINAL: external/bsd/file/dist/src/getline.c */
35 
36 #include "includes.h"
37 
38 #if 0
39 #include "file.h"
40 #endif
41 
42 #if !HAVE_GETLINE
43 #include <stdlib.h>
44 #include <stdio.h>
45 #include <unistd.h>
46 #include <errno.h>
47 #include <string.h>
48 
49 static ssize_t
50 getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
51 {
52 	char *ptr, *eptr;
53 
54 
55 	if (*buf == NULL || *bufsiz == 0) {
56 		*bufsiz = BUFSIZ;
57 		if ((*buf = malloc(*bufsiz)) == NULL)
58 			return -1;
59 	}
60 
61 	for (ptr = *buf, eptr = *buf + *bufsiz;;) {
62 		int c = fgetc(fp);
63 		if (c == -1) {
64 			if (feof(fp)) {
65 				ssize_t diff = (ssize_t)(ptr - *buf);
66 				if (diff != 0) {
67 					*ptr = '\0';
68 					return diff;
69 				}
70 			}
71 			return -1;
72 		}
73 		*ptr++ = c;
74 		if (c == delimiter) {
75 			*ptr = '\0';
76 			return ptr - *buf;
77 		}
78 		if (ptr + 2 >= eptr) {
79 			char *nbuf;
80 			size_t nbufsiz = *bufsiz * 2;
81 			ssize_t d = ptr - *buf;
82 			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
83 				return -1;
84 			*buf = nbuf;
85 			*bufsiz = nbufsiz;
86 			eptr = nbuf + nbufsiz;
87 			ptr = nbuf + d;
88 		}
89 	}
90 }
91 
92 ssize_t
93 getline(char **buf, size_t *bufsiz, FILE *fp)
94 {
95 	return getdelim(buf, bufsiz, '\n', fp);
96 }
97 
98 #endif
99 
100 #ifdef TEST
101 int
102 main(int argc, char *argv[])
103 {
104 	char *p = NULL;
105 	ssize_t len;
106 	size_t n = 0;
107 
108 	while ((len = getline(&p, &n, stdin)) != -1)
109 		(void)printf("%" SIZE_T_FORMAT "d %s", len, p);
110 	free(p);
111 	return 0;
112 }
113 #endif
114