str.c revision 1.2 1 1.1 christos /*
2 1.1 christos * Copyright (c) 1994 Christos Zoulas
3 1.1 christos * All rights reserved.
4 1.1 christos *
5 1.1 christos * Redistribution and use in source and binary forms, with or without
6 1.1 christos * modification, are permitted provided that the following conditions
7 1.1 christos * are met:
8 1.1 christos * 1. Redistributions of source code must retain the above copyright
9 1.1 christos * notice, this list of conditions and the following disclaimer.
10 1.1 christos * 2. Redistributions in binary form must reproduce the above copyright
11 1.1 christos * notice, this list of conditions and the following disclaimer in the
12 1.1 christos * documentation and/or other materials provided with the distribution.
13 1.1 christos * 3. All advertising materials mentioning features or use of this software
14 1.1 christos * must display the following acknowledgement:
15 1.1 christos * This product includes software developed by Christos Zoulas.
16 1.1 christos * 4. The name of the author may not be used to endorse or promote products
17 1.1 christos * derived from this software without specific prior written permission.
18 1.1 christos *
19 1.1 christos * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20 1.1 christos * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 1.1 christos * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 1.1 christos * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23 1.1 christos * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 1.1 christos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 1.1 christos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 1.1 christos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 1.1 christos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 1.1 christos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 1.1 christos * SUCH DAMAGE.
30 1.1 christos */
31 1.1 christos
32 1.1 christos #ifndef lint
33 1.2 cgd static char *rcsid = "$Id: str.c,v 1.2 1995/04/24 13:25:55 cgd Exp $";
34 1.1 christos #endif
35 1.1 christos
36 1.1 christos /*
37 1.1 christos * Counted strings
38 1.1 christos */
39 1.1 christos #include <stdlib.h>
40 1.2 cgd #include <string.h>
41 1.1 christos
42 1.1 christos #include "util.h"
43 1.1 christos #include "str.h"
44 1.1 christos
45 1.1 christos /*
46 1.1 christos * str_init(): Initialize string
47 1.1 christos */
48 1.1 christos void
49 1.1 christos str_init(s)
50 1.1 christos struct string *s;
51 1.1 christos {
52 1.1 christos s->s_str = NULL;
53 1.1 christos s->s_len = 0;
54 1.1 christos }
55 1.1 christos
56 1.1 christos
57 1.1 christos /*
58 1.1 christos * str_append(): Append string allocating buffer as necessary
59 1.1 christos */
60 1.1 christos void
61 1.1 christos str_append(buf, str, del)
62 1.1 christos struct string *buf;
63 1.1 christos const char *str;
64 1.1 christos int del;
65 1.1 christos {
66 1.1 christos size_t len = strlen(str) + 1;
67 1.1 christos
68 1.1 christos if (buf->s_str == NULL)
69 1.1 christos buf->s_str = emalloc(len);
70 1.1 christos else {
71 1.1 christos buf->s_str = erealloc(buf->s_str, buf->s_len + len +
72 1.1 christos (del ? 2 : 1));
73 1.1 christos if (del)
74 1.1 christos buf->s_str[buf->s_len++] = del;
75 1.1 christos }
76 1.1 christos
77 1.1 christos memcpy(&buf->s_str[buf->s_len], str, len);
78 1.1 christos buf->s_len += len - 1;
79 1.1 christos }
80 1.1 christos
81 1.1 christos /*
82 1.1 christos * str_prepend(): Prepend string allocating buffer as necessary
83 1.1 christos */
84 1.1 christos void
85 1.1 christos str_prepend(buf, str, del)
86 1.1 christos struct string *buf;
87 1.1 christos const char *str;
88 1.1 christos int del;
89 1.1 christos {
90 1.1 christos char *ptr, *sptr;
91 1.1 christos size_t len = strlen(str) + 1;
92 1.1 christos
93 1.1 christos sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
94 1.1 christos
95 1.1 christos if (del)
96 1.1 christos *ptr++ = del;
97 1.1 christos
98 1.1 christos memcpy(ptr, str, len);
99 1.1 christos
100 1.1 christos if (buf->s_str) {
101 1.1 christos memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
102 1.1 christos free(buf->s_str);
103 1.1 christos }
104 1.1 christos
105 1.1 christos buf->s_str = sptr;
106 1.1 christos buf->s_len += del ? len : len - 1;
107 1.1 christos }
108 1.1 christos
109 1.1 christos /*
110 1.1 christos * str_free(): Free a string
111 1.1 christos */
112 1.1 christos void
113 1.1 christos str_free(s)
114 1.1 christos struct string *s;
115 1.1 christos {
116 1.1 christos free(s->s_str);
117 1.1 christos s->s_str = NULL;
118 1.1 christos s->s_len = 0;
119 1.1 christos }
120