1 /*        $NetBSD: stringlist.c,v 1.15 2022/03/12 17:31:39 christos Exp $       */
2 
3 /*-
4  * Copyright (c) 1994, 1999 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Christos Zoulas.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
34 __RCSID("$NetBSD: stringlist.c,v 1.15 2022/03/12 17:31:39 christos Exp $");
35 #endif /* LIBC_SCCS and not lint */
36 
37 #include "namespace.h"
38 
39 #include <assert.h>
40 #include <err.h>
41 #include <errno.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <stringlist.h>
46 
47 #ifdef __weak_alias
__weak_alias(sl_add,_sl_add)48 __weak_alias(sl_add,_sl_add)
49 __weak_alias(sl_find,_sl_find)
50 __weak_alias(sl_free,_sl_free)
51 __weak_alias(sl_init,_sl_init)
52 __weak_alias(sl_delete,_sl_delete)
53 #endif
54 
55 #define _SL_CHUNKSIZE         20
56 
57 /*
58  * sl_init(): Initialize a string list
59  */
60 StringList *
61 sl_init(void)
62 {
63           StringList *sl;
64 
65           sl = malloc(sizeof(StringList));
66           if (sl == NULL)
67                     return NULL;
68 
69           sl->sl_cur = 0;
70           sl->sl_max = _SL_CHUNKSIZE;
71           sl->sl_str = NULL;
72           errno = reallocarr(&sl->sl_str, sl->sl_max, sizeof(*sl->sl_str));
73           if (errno) {
74                     int serrno = errno;
75                     free(sl);
76                     errno = serrno;
77                     sl = NULL;
78           }
79           return sl;
80 }
81 
82 
83 /*
84  * sl_add(): Add an item to the string list
85  */
86 int
sl_add(StringList * sl,char * name)87 sl_add(StringList *sl, char *name)
88 {
89 
90           _DIAGASSERT(sl != NULL);
91 
92           if (sl->sl_cur == sl->sl_max - 1) {
93                     char      **new = sl->sl_str;
94 
95                     errno = reallocarr(&new, (sl->sl_max + _SL_CHUNKSIZE),
96                         sizeof(*new));
97                     if (errno)
98                               return -1;
99                     sl->sl_max += _SL_CHUNKSIZE;
100                     sl->sl_str = new;
101           }
102           sl->sl_str[sl->sl_cur++] = name;
103           return 0;
104 }
105 
106 
107 /*
108  * sl_free(): Free a stringlist
109  */
110 void
sl_free(StringList * sl,int all)111 sl_free(StringList *sl, int all)
112 {
113           size_t i;
114 
115           if (sl == NULL)
116                     return;
117           if (sl->sl_str) {
118                     if (all)
119                               for (i = 0; i < sl->sl_cur; i++)
120                                         free(sl->sl_str[i]);
121                     free(sl->sl_str);
122           }
123           free(sl);
124 }
125 
126 
127 /*
128  * sl_find(): Find a name in the string list
129  */
130 char *
sl_find(StringList * sl,const char * name)131 sl_find(StringList *sl, const char *name)
132 {
133           size_t i;
134 
135           _DIAGASSERT(sl != NULL);
136 
137           for (i = 0; i < sl->sl_cur; i++)
138                     if (strcmp(sl->sl_str[i], name) == 0)
139                               return sl->sl_str[i];
140 
141           return NULL;
142 }
143 
144 int
sl_delete(StringList * sl,const char * name,int all)145 sl_delete(StringList *sl, const char *name, int all)
146 {
147           size_t i, j;
148 
149           for (i = 0; i < sl->sl_cur; i++)
150                     if (strcmp(sl->sl_str[i], name) == 0) {
151                               if (all)
152                                         free(sl->sl_str[i]);
153                               for (j = i + 1; j < sl->sl_cur; j++)
154                                         sl->sl_str[j - 1] = sl->sl_str[j];
155                               sl->sl_str[--sl->sl_cur] = NULL;
156                               return 0;
157                     }
158           return -1;
159 }
160 
161