1 /* $OpenBSD: strings.c,v 1.8 2003/06/03 02:56:11 millert Exp $ */
2 /* $NetBSD: strings.c,v 1.5 1996/06/08 19:48:40 christos Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 #if 0
35 static const char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93";
36 #else
37 static const char rcsid[] = "$OpenBSD: strings.c,v 1.8 2003/06/03 02:56:11 millert Exp $";
38 #endif
39 #endif /* not lint */
40
41 /*
42 * Mail -- a mail program
43 *
44 * String allocation routines.
45 * Strings handed out here are reclaimed at the top of the command
46 * loop each time, so they need not be freed.
47 */
48
49 #include "rcv.h"
50 #include "extern.h"
51
52 /*
53 * Allocate size more bytes of space and return the address of the
54 * first byte to the caller. An even number of bytes are always
55 * allocated so that the space will always be on a word boundary.
56 * The string spaces are of exponentially increasing size, to satisfy
57 * the occasional user with enormous string size requests.
58 */
59 char *
salloc(int size)60 salloc(int size)
61 {
62 char *t;
63 int s;
64 struct strings *sp;
65 int index;
66
67 s = size;
68 s += (sizeof(char *) - 1);
69 s &= ~(sizeof(char *) - 1);
70 index = 0;
71 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
72 if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s)
73 break;
74 if (sp->s_nleft >= s)
75 break;
76 index++;
77 }
78 if (sp >= &stringdope[NSPACE])
79 errx(1, "String too large");
80 if (sp->s_topFree == NULL) {
81 index = sp - &stringdope[0];
82 sp->s_topFree = (char *)malloc(STRINGSIZE << index);
83 if (sp->s_topFree == NULL)
84 errx(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