xref: /netbsd-src/usr.sbin/netgroup_mkdb/str.c (revision d0fed6c87ddc40a8bffa6f99e7433ddfc864dd83)
1 /*	$NetBSD: str.c,v 1.3 1996/10/04 05:15:30 christos 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  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by Christos Zoulas.
18  * 4. The name of the author may not be used to endorse or promote products
19  *    derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
22  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifndef lint
35 static char *rcsid = "$NetBSD: str.c,v 1.3 1996/10/04 05:15:30 christos Exp $";
36 #endif
37 
38 /*
39  * Counted strings
40  */
41 #include <stdlib.h>
42 #include <string.h>
43 
44 #include "util.h"
45 #include "str.h"
46 
47 /*
48  * str_init(): Initialize string
49  */
50 void
51 str_init(s)
52 	struct string  *s;
53 {
54 	s->s_str = NULL;
55 	s->s_len = 0;
56 }
57 
58 
59 /*
60  * str_append(): Append string allocating buffer as necessary
61  */
62 void
63 str_append(buf, str, del)
64 	struct string  *buf;
65 	const char     *str;
66 	int             del;
67 {
68 	size_t          len = strlen(str) + 1;
69 
70 	if (buf->s_str == NULL)
71 		buf->s_str = emalloc(len);
72 	else {
73 		buf->s_str = erealloc(buf->s_str, buf->s_len + len +
74 						  (del ? 2 : 1));
75 		if (del)
76 			buf->s_str[buf->s_len++] = del;
77 	}
78 
79 	memcpy(&buf->s_str[buf->s_len], str, len);
80 	buf->s_len += len - 1;
81 }
82 
83 /*
84  * str_prepend(): Prepend string allocating buffer as necessary
85  */
86 void
87 str_prepend(buf, str, del)
88 	struct string  *buf;
89 	const char     *str;
90 	int             del;
91 {
92 	char           *ptr, *sptr;
93 	size_t          len = strlen(str) + 1;
94 
95 	sptr = ptr = emalloc(buf->s_len + len + (del ? 2 : 1));
96 
97 	if (del)
98 		*ptr++ = del;
99 
100 	memcpy(ptr, str, len);
101 
102 	if (buf->s_str) {
103 		memcpy(&ptr[len - 1], buf->s_str, buf->s_len + 1);
104 		free(buf->s_str);
105 	}
106 
107 	buf->s_str = sptr;
108 	buf->s_len += del ? len : len - 1;
109 }
110 
111 /*
112  * str_free(): Free a string
113  */
114 void
115 str_free(s)
116 	struct string  *s;
117 {
118 	free(s->s_str);
119 	s->s_str = NULL;
120 	s->s_len = 0;
121 }
122