1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY 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 #ifndef lint
33 #if 0
34 static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93";
35 #endif
36 #endif /* not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39
40 /*
41 * Mail -- a mail program
42 *
43 * String allocation routines.
44 * Strings handed out here are reclaimed at the top of the command
45 * loop each time, so they need not be freed.
46 */
47
48 #include "rcv.h"
49 #include "extern.h"
50
51 struct strings stringdope[NSPACE];
52
53 /*
54 * Allocate size more bytes of space and return the address of the
55 * first byte to the caller. An even number of bytes are always
56 * allocated so that the space will always be on a word boundary.
57 * The string spaces are of exponentially increasing size, to satisfy
58 * the occasional user with enormous string size requests.
59 */
60
61 char *
salloc(int size)62 salloc(int size)
63 {
64 char *t;
65 int s, index;
66 struct strings *sp;
67
68 s = size;
69 s += (sizeof(char *) - 1);
70 s &= ~(sizeof(char *) - 1);
71 index = 0;
72 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
73 if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s)
74 break;
75 if (sp->s_nleft >= s)
76 break;
77 index++;
78 }
79 if (sp >= &stringdope[NSPACE])
80 errx(1, "String too large");
81 if (sp->s_topFree == NULL) {
82 index = sp - &stringdope[0];
83 if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL)
84 err(1, "No room for space %d", index);
85 sp->s_nextFree = sp->s_topFree;
86 sp->s_nleft = STRINGSIZE << index;
87 }
88 sp->s_nleft -= s;
89 t = sp->s_nextFree;
90 sp->s_nextFree += s;
91 return (t);
92 }
93
94 /*
95 * Reset the string area to be empty.
96 * Called to free all strings allocated
97 * since last reset.
98 */
99 void
sreset(void)100 sreset(void)
101 {
102 struct strings *sp;
103 int index;
104
105 if (noreset)
106 return;
107 index = 0;
108 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
109 if (sp->s_topFree == NULL)
110 continue;
111 sp->s_nextFree = sp->s_topFree;
112 sp->s_nleft = STRINGSIZE << index;
113 index++;
114 }
115 }
116
117 /*
118 * Make the string area permanent.
119 * Meant to be called in main, after initialization.
120 */
121 void
spreserve(void)122 spreserve(void)
123 {
124 struct strings *sp;
125
126 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++)
127 sp->s_topFree = NULL;
128 }
129