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