1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30
31
32 #include <limits.h>
33 #include <string.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <errno.h>
37 #include <locale.h>
38 #include <libintl.h>
39 #include <pkglib.h>
40 #include <libadm.h>
41
42 #define ERR_MEMORY "memory allocation failure, errno=%d"
43
44 /*
45 * using factor of eight limits maximum
46 * memory fragmentation to 12.5%
47 */
48 #define MEMSIZ PATH_MAX*8
49 #define NULL 0
50
51 struct dup {
52 char mem[MEMSIZ];
53 struct dup *next;
54 };
55
56 static struct dup *head, *tail, *new;
57
58 static int size, initialized;
59 static void pathinit();
60 static void growstore();
61
62 /*
63 * These functions allocate space for all the path names required
64 * in the packaging code. They are all allocated here so as to reduce
65 * memory fragmentation.
66 */
67
68 /* Initialize storage area. */
69 static void
pathinit()70 pathinit()
71 {
72 if (head == NULL)
73 size = (-1);
74 else {
75 /* free all memory used except initial structure */
76 tail = head->next;
77 while (tail) {
78 new = tail->next;
79 free(tail);
80 tail = new;
81 }
82 tail = head;
83 size = MEMSIZ;
84 }
85
86 initialized = 1;
87 }
88
89 /* Allocate additional space for storage area. */
90 static void
growstore()91 growstore()
92 {
93 /* need more memory */
94 new = calloc(1, sizeof (struct dup));
95 if (new == NULL) {
96 progerr(gettext(ERR_MEMORY), errno);
97 quit(99);
98 }
99 if (head == NULL)
100 head = new;
101 else
102 tail->next = new;
103 tail = new;
104 size = MEMSIZ;
105 }
106
107 /* Allocate and return a pointer. If n == 0, initialize. */
108 char *
pathalloc(int n)109 pathalloc(int n)
110 {
111 char *pt;
112
113 if (n <= 0) {
114 pathinit();
115 pt = NULL;
116 } else {
117 if (!initialized)
118 pathinit();
119
120 n++; /* Account for terminating null. */
121
122 if (size < n)
123 growstore();
124
125 pt = &tail->mem[MEMSIZ-size];
126 size -= n;
127 }
128
129 return (pt);
130 }
131
132 /* Allocate and insert a pathname returning a pointer to the new string. */
133 char *
pathdup(char * s)134 pathdup(char *s)
135 {
136 char *pt;
137 int n;
138
139 if (s == NULL) {
140 pathinit();
141 pt = NULL;
142 } else {
143 if (!initialized)
144 pathinit();
145
146 n = strlen(s) + 1; /* string + null terminator */
147
148 if (size < n)
149 growstore();
150
151 pt = &tail->mem[MEMSIZ-size];
152 size -= n;
153
154 (void) strcpy(pt, s);
155 }
156
157 return (pt);
158 }
159