Annotation of src/usr.bin/mail/strings.c, Revision 1.6
1.6 ! millert 1: /* $OpenBSD: strings.c,v 1.5 1997/07/14 00:24:30 millert Exp $ */
1.2 deraadt 2: /* $NetBSD: strings.c,v 1.5 1996/06/08 19:48:40 christos Exp $ */
3:
1.1 deraadt 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. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
1.2 deraadt 38: #if 0
39: static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93";
40: #else
1.6 ! millert 41: static char rcsid[] = "$OpenBSD: strings.c,v 1.5 1997/07/14 00:24:30 millert Exp $";
1.2 deraadt 42: #endif
1.1 deraadt 43: #endif /* not lint */
44:
45: /*
46: * Mail -- a mail program
47: *
48: * String allocation routines.
49: * Strings handed out here are reclaimed at the top of the command
50: * loop each time, so they need not be freed.
51: */
52:
53: #include "rcv.h"
54: #include "extern.h"
55:
56: /*
57: * Allocate size more bytes of space and return the address of the
58: * first byte to the caller. An even number of bytes are always
59: * allocated so that the space will always be on a word boundary.
60: * The string spaces are of exponentially increasing size, to satisfy
61: * the occasional user with enormous string size requests.
62: */
63:
64: char *
65: salloc(size)
66: int size;
67: {
1.6 ! millert 68: char *t;
! 69: int s;
! 70: struct strings *sp;
1.1 deraadt 71: int index;
72:
73: s = size;
1.3 millert 74: s += (sizeof(char *) - 1);
75: s &= ~(sizeof(char *) - 1);
1.1 deraadt 76: index = 0;
77: for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
1.5 millert 78: if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s)
1.1 deraadt 79: break;
80: if (sp->s_nleft >= s)
81: break;
82: index++;
83: }
84: if (sp >= &stringdope[NSPACE])
1.6 ! millert 85: errx(1, "String too large");
1.5 millert 86: if (sp->s_topFree == NULL) {
1.1 deraadt 87: index = sp - &stringdope[0];
1.4 millert 88: sp->s_topFree = (char *)malloc(STRINGSIZE << index);
1.6 ! millert 89: if (sp->s_topFree == NULL)
! 90: errx(1, "No room for space %d", index);
1.1 deraadt 91: sp->s_nextFree = sp->s_topFree;
92: sp->s_nleft = STRINGSIZE << index;
93: }
94: sp->s_nleft -= s;
95: t = sp->s_nextFree;
96: sp->s_nextFree += s;
97: return(t);
98: }
99:
100: /*
101: * Reset the string area to be empty.
102: * Called to free all strings allocated
103: * since last reset.
104: */
105: void
106: sreset()
107: {
1.6 ! millert 108: struct strings *sp;
! 109: int index;
1.1 deraadt 110:
111: if (noreset)
112: return;
113: index = 0;
114: for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
1.5 millert 115: if (sp->s_topFree == NULL)
1.1 deraadt 116: continue;
117: sp->s_nextFree = sp->s_topFree;
118: sp->s_nleft = STRINGSIZE << index;
119: index++;
120: }
121: }
122:
123: /*
124: * Make the string area permanent.
125: * Meant to be called in main, after initialization.
126: */
127: void
128: spreserve()
129: {
1.6 ! millert 130: struct strings *sp;
1.1 deraadt 131:
132: for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++)
1.5 millert 133: sp->s_topFree = NULL;
1.1 deraadt 134: }
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