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 #include "file.h"
35 #if !HAVE_GETLINE
36 #include <stdlib.h>
37 #include <stdio.h>
38 #include <unistd.h>
39 #include <errno.h>
40 #include <string.h>
41
42 public ssize_t
getdelim(char ** buf,size_t * bufsiz,int delimiter,FILE * fp)43 getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
44 {
45 char *ptr, *eptr;
46
47
48 if (*buf == NULL || *bufsiz == 0) {
49 *bufsiz = BUFSIZ;
50 if ((*buf = malloc(*bufsiz)) == NULL)
51 return -1;
52 }
53
54 for (ptr = *buf, eptr = *buf + *bufsiz;;) {
55 int c = fgetc(fp);
56 if (c == -1) {
57 if (feof(fp)) {
58 ssize_t diff = (ssize_t)(ptr - *buf);
59 if (diff != 0) {
60 *ptr = '\0';
61 return diff;
62 }
63 }
64 return -1;
65 }
66 *ptr++ = c;
67 if (c == delimiter) {
68 *ptr = '\0';
69 return ptr - *buf;
70 }
71 if (ptr + 2 >= eptr) {
72 char *nbuf;
73 size_t nbufsiz = *bufsiz * 2;
74 ssize_t d = ptr - *buf;
75 if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
76 return -1;
77 *buf = nbuf;
78 *bufsiz = nbufsiz;
79 eptr = nbuf + nbufsiz;
80 ptr = nbuf + d;
81 }
82 }
83 }
84
85 public ssize_t
getline(char ** buf,size_t * bufsiz,FILE * fp)86 getline(char **buf, size_t *bufsiz, FILE *fp)
87 {
88 return getdelim(buf, bufsiz, '\n', fp);
89 }
90
91 #endif
92
93 #ifdef TEST
94 int
main(int argc,char * argv[])95 main(int argc, char *argv[])
96 {
97 char *p = NULL;
98 ssize_t len;
99 size_t n = 0;
100
101 while ((len = getline(&p, &n, stdin)) != -1)
102 (void)printf("%" SIZE_T_FORMAT "d %s", len, p);
103 free(p);
104 return 0;
105 }
106 #endif
107