xref: /freebsd/lib/libc/gen/stringlist.c (revision 6780ab54325a71e7e70112b11657973edde8655e)
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  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by Christos Zoulas.
16  * 4. The name of the author may not be used to endorse or promote products
17  *    derived from this software without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
20  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
23  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *rcsid = "$NetBSD: stringlist.c,v 1.2 1997/01/17 07:26:20 lukem Exp $";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include "namespace.h"
39 #include <stdio.h>
40 #include <string.h>
41 #include <err.h>
42 #include <stdlib.h>
43 #include <stringlist.h>
44 #include "un-namespace.h"
45 
46 #define _SL_CHUNKSIZE	20
47 
48 /*
49  * sl_init(): Initialize a string list
50  */
51 StringList *
52 sl_init()
53 {
54 	StringList *sl;
55 
56 	sl = malloc(sizeof(StringList));
57 	if (sl == NULL)
58 		_err(1, "stringlist: %m");
59 
60 	sl->sl_cur = 0;
61 	sl->sl_max = _SL_CHUNKSIZE;
62 	sl->sl_str = malloc(sl->sl_max * sizeof(char *));
63 	if (sl->sl_str == NULL)
64 		_err(1, "stringlist: %m");
65 	return sl;
66 }
67 
68 
69 /*
70  * sl_add(): Add an item to the string list
71  */
72 int
73 sl_add(sl, name)
74 	StringList *sl;
75 	char *name;
76 {
77 	if (sl->sl_cur == sl->sl_max - 1) {
78 		sl->sl_max += _SL_CHUNKSIZE;
79 		sl->sl_str = reallocf(sl->sl_str, sl->sl_max * sizeof(char *));
80 		if (sl->sl_str == NULL)
81 			return (-1);
82 	}
83 	sl->sl_str[sl->sl_cur++] = name;
84 	return (0);
85 }
86 
87 
88 /*
89  * sl_free(): Free a stringlist
90  */
91 void
92 sl_free(sl, all)
93 	StringList *sl;
94 	int all;
95 {
96 	size_t i;
97 
98 	if (sl == NULL)
99 		return;
100 	if (sl->sl_str) {
101 		if (all)
102 			for (i = 0; i < sl->sl_cur; i++)
103 				free(sl->sl_str[i]);
104 		free(sl->sl_str);
105 	}
106 	free(sl);
107 }
108 
109 
110 /*
111  * sl_find(): Find a name in the string list
112  */
113 char *
114 sl_find(sl, name)
115 	StringList *sl;
116 	char *name;
117 {
118 	size_t i;
119 
120 	for (i = 0; i < sl->sl_cur; i++)
121 		if (strcmp(sl->sl_str[i], name) == 0)
122 			return sl->sl_str[i];
123 
124 	return NULL;
125 }
126