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