1  /*	$NetBSD: getdelim.c,v 1.2 2015/12/25 20:12:46 joerg Exp $	*/
 2  /*	NetBSD-src: getline.c,v 1.2 2014/09/16 17:23:50 christos Exp 	*/
 3  
 4  /*-
 5   * Copyright (c) 2011 The NetBSD Foundation, Inc.
 6   * All rights reserved.
 7   *
 8   * This code is derived from software contributed to The NetBSD Foundation
 9   * by Christos Zoulas.
10   *
11   * Redistribution and use in source and binary forms, with or without
12   * modification, are permitted provided that the following conditions
13   * are met:
14   * 1. Redistributions of source code must retain the above copyright
15   *    notice, this list of conditions and the following disclaimer.
16   * 2. Redistributions in binary form must reproduce the above copyright
17   *    notice, this list of conditions and the following disclaimer in the
18   *    documentation and/or other materials provided with the distribution.
19   *
20   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30   * POSSIBILITY OF SUCH DAMAGE.
31   */
32  
33  #include <stdio.h>
34  #include <stdlib.h>
35  #include "getline.h"
36  
37  #if !HAVE_GETDELIM
38  
39  ssize_t
40  getdelim(char **buf, size_t *bufsiz, int delimiter, FILE *fp)
41  {
42  	char *ptr, *eptr;
43  
44  
45  	if (*buf == NULL || *bufsiz == 0) {
46  		*bufsiz = BUFSIZ;
47  		if ((*buf = malloc(*bufsiz)) == NULL)
48  			return -1;
49  	}
50  
51  	for (ptr = *buf, eptr = *buf + *bufsiz;;) {
52  		int c = fgetc(fp);
53  		if (c == -1) {
54  			if (feof(fp)) {
55  				ssize_t diff = (ssize_t)(ptr - *buf);
56  				if (diff != 0) {
57  					*ptr = '\0';
58  					return diff;
59  				}
60  			}
61  			return -1;
62  		}
63  		*ptr++ = c;
64  		if (c == delimiter) {
65  			*ptr = '\0';
66  			return ptr - *buf;
67  		}
68  		if (ptr + 2 >= eptr) {
69  			char *nbuf;
70  			size_t nbufsiz = *bufsiz * 2;
71  			ssize_t d = ptr - *buf;
72  			if ((nbuf = realloc(*buf, nbufsiz)) == NULL)
73  				return -1;
74  			*buf = nbuf;
75  			*bufsiz = nbufsiz;
76  			eptr = nbuf + nbufsiz;
77  			ptr = nbuf + d;
78  		}
79  	}
80  }
81  
82  #endif
83  
84  #if !HAVE_GETLINE
85  
86  ssize_t
87  getline(char **buf, size_t *bufsiz, FILE *fp)
88  {
89  	return getdelim(buf, bufsiz, '\n', fp);
90  }
91  
92  #endif