1 /*-
2 * Copyright (c) 2006, Maxime Henrion <mux@FreeBSD.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY 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 * $Id$
27 */
28
29 #include <assert.h>
30 #include <stdlib.h>
31
32 #include "attrstack.h"
33 #include "fattr.h"
34 #include "misc.h"
35
36 #define ATTRSTACK_DEFSIZE 16 /* Initial size of the stack. */
37
38 struct attrstack {
39 struct fattr **stack;
40 size_t cur;
41 size_t size;
42 };
43
44 struct attrstack *
attrstack_new(void)45 attrstack_new(void)
46 {
47 struct attrstack *as;
48
49 as = xmalloc(sizeof(struct attrstack));
50 as->stack = xmalloc(sizeof(struct fattr *) * ATTRSTACK_DEFSIZE);
51 as->size = ATTRSTACK_DEFSIZE;
52 as->cur = 0;
53 return (as);
54 }
55
56 struct fattr *
attrstack_pop(struct attrstack * as)57 attrstack_pop(struct attrstack *as)
58 {
59
60 assert(as->cur > 0);
61 return (as->stack[--as->cur]);
62 }
63
64 void
attrstack_push(struct attrstack * as,struct fattr * fa)65 attrstack_push(struct attrstack *as, struct fattr *fa)
66 {
67
68 if (as->cur >= as->size) {
69 as->size *= 2;
70 as->stack = xrealloc(as->stack,
71 sizeof(struct fattr *) * as->size);
72 }
73 as->stack[as->cur++] = fa;
74 }
75
76 size_t
attrstack_size(struct attrstack * as)77 attrstack_size(struct attrstack *as)
78 {
79
80 return (as->cur);
81 }
82
83 void
attrstack_free(struct attrstack * as)84 attrstack_free(struct attrstack *as)
85 {
86
87 assert(as->cur == 0);
88 free(as->stack);
89 free(as);
90 }
91