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