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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1980 Regents of the University of California. | |
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 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)strings.c 5.9 (Berkeley) 6/1/90"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | * Mail -- a mail program | |
40 | * | |
41 | * String allocation routines. | |
42 | * Strings handed out here are reclaimed at the top of the command | |
43 | * loop each time, so they need not be freed. | |
44 | */ | |
45 | ||
46 | #include "rcv.h" | |
47 | ||
48 | /* | |
49 | * Allocate size more bytes of space and return the address of the | |
50 | * first byte to the caller. An even number of bytes are always | |
51 | * allocated so that the space will always be on a word boundary. | |
52 | * The string spaces are of exponentially increasing size, to satisfy | |
53 | * the occasional user with enormous string size requests. | |
54 | */ | |
55 | ||
56 | char * | |
57 | salloc(size) | |
58 | { | |
59 | register char *t; | |
60 | register int s; | |
61 | register struct strings *sp; | |
62 | int index; | |
63 | ||
64 | s = size; | |
65 | s += 3; | |
66 | s &= ~03; | |
67 | index = 0; | |
68 | for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { | |
69 | if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s) | |
70 | break; | |
71 | if (sp->s_nleft >= s) | |
72 | break; | |
73 | index++; | |
74 | } | |
75 | if (sp >= &stringdope[NSPACE]) | |
76 | panic("String too large"); | |
77 | if (sp->s_topFree == NOSTR) { | |
78 | index = sp - &stringdope[0]; | |
79 | sp->s_topFree = malloc(STRINGSIZE << index); | |
80 | if (sp->s_topFree == NOSTR) { | |
81 | fprintf(stderr, "No room for space %d\n", index); | |
82 | panic("Internal error"); | |
83 | } | |
84 | sp->s_nextFree = sp->s_topFree; | |
85 | sp->s_nleft = STRINGSIZE << index; | |
86 | } | |
87 | sp->s_nleft -= s; | |
88 | t = sp->s_nextFree; | |
89 | sp->s_nextFree += s; | |
90 | return(t); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Reset the string area to be empty. | |
95 | * Called to free all strings allocated | |
96 | * since last reset. | |
97 | */ | |
98 | sreset() | |
99 | { | |
100 | register struct strings *sp; | |
101 | register int index; | |
102 | ||
103 | if (noreset) | |
104 | return; | |
105 | index = 0; | |
106 | for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { | |
107 | if (sp->s_topFree == NOSTR) | |
108 | continue; | |
109 | sp->s_nextFree = sp->s_topFree; | |
110 | sp->s_nleft = STRINGSIZE << index; | |
111 | index++; | |
112 | } | |
113 | } | |
114 | ||
115 | /* | |
116 | * Make the string area permanent. | |
117 | * Meant to be called in main, after initialization. | |
118 | */ | |
119 | spreserve() | |
120 | { | |
121 | register struct strings *sp; | |
122 | ||
123 | for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) | |
124 | sp->s_topFree = NOSTR; | |
125 | } |