1 /* $NetBSD: bsd-getline.c,v 1.1.1.1 2020/03/03 00:11:47 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
51 static ssize_t
getdelim(char ** buf,size_t * bufsiz,int delimiter,FILE * fp)52 getdelim(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
94 ssize_t
getline(char ** buf,size_t * bufsiz,FILE * fp)95 getline(char **buf, size_t *bufsiz, FILE *fp)
96 {
97 return getdelim(buf, bufsiz, '\n', fp);
98 }
99
100 #endif
101
102 #ifdef TEST
103 int
main(int argc,char * argv[])104 main(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