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
51static ssize_t
52la_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
94ssize_t
95getline(char **buf, size_t *bufsiz, FILE *fp)
96{
97	return la_getdelim(buf, bufsiz, '\n', fp);
98}
99#endif
100