1 /* $NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $ */
2
3 /*
4 * Copyright (c) 1994 Christos Zoulas
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #ifndef lint
31 __RCSID("$NetBSD: str.c,v 1.7 2009/10/21 01:07:47 snj Exp $");
32 #endif
33
34 /*
35 * Counted strings
36 */
37 #include <stdlib.h>
38 #include <string.h>
39 #include <err.h>
40 #include <util.h>
41
42 #include "str.h"
43
44 /*
45 * str_init(): Initialize string
46 */
47 void
str_init(struct string * s)48 str_init(struct string *s)
49 {
50 s->s_str = NULL;
51 s->s_len = 0;
52 }
53
54
55 /*
56 * str_append(): Append string allocating buffer as necessary
57 */
58 void
str_append(struct string * buf,const char * str,int del)59 str_append(struct string *buf, const char *str, int del)
60 {
61 size_t len = strlen(str) + 1;
62
63 if (buf->s_str == NULL)
64 buf->s_str = emalloc(len);
65 else {
66 buf->s_str = erealloc(buf->s_str, buf->s_len + len +
67 (del ? 2 : 1));
68 if (del)
69 buf->s_str[buf->s_len++] = del;
70 }
71
72 memcpy(&buf->s_str[buf->s_len], str, len);
73 buf->s_len += len - 1;
74 }
75
76 /*
77 * str_prepend(): Prepend string allocating buffer as necessary
78 */
79 void
str_prepend(struct string * buf,const char * str,int del)80 str_prepend(struct string *buf, const char *str, int del)
81 {
82 char *ptr, *sptr;
83 size_t len = strlen(str) + 1;
84
85 sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
86
87 if (del)
88 *ptr++ = del;
89
90 memcpy(ptr, str, len);
91
92 if (buf->s_str) {
93 memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
94 free(buf->s_str);
95 }
96
97 buf->s_str = sptr;
98 buf->s_len += del ? len : len - 1;
99 }
100
101 /*
102 * str_free(): Free a string
103 */
104 void
str_free(struct string * s)105 str_free(struct string *s)
106 {
107 free(s->s_str);
108 s->s_str = NULL;
109 s->s_len = 0;
110 }
111