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 "openbsd-compat.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#ifdef HAVE_UNISTD_H
46#include <unistd.h>
47#endif
48#include <errno.h>
49#include <string.h>
50
51static ssize_t
52getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
53{
54	char *ptr, *eptr;
55
56
57	if (*buf == NULL || *bufsiz == 0) {
58		if ((*buf = malloc(BUFSIZ)) == NULL)
59			return -1;
60		*bufsiz = BUFSIZ;
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++ = (char)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 getdelim(buf, bufsiz, '\n', fp);
98}
99
100#endif
101
102#ifdef TEST
103int
104main(int argc, char *argv[])
105{
106	char *p = NULL;
107	ssize_t len;
108	size_t n = 0;
109
110	while ((len = getline(&p, &n, stdin)) != -1)
111		(void)printf("%" SIZE_T_FORMAT "d %s", len, p);
112	free(p);
113	return 0;
114}
115#endif
116