1 /* $NetBSD: strings.c,v 1.6 1997/10/19 05:03:54 lukem Exp $ */ 2 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: strings.c,v 1.6 1997/10/19 05:03:54 lukem Exp $"); 42 #endif 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 { 68 char *t; 69 int s; 70 struct strings *sp; 71 int index; 72 73 s = size; 74 s += (sizeof (char *) - 1); 75 s &= ~(sizeof (char *) - 1); 76 index = 0; 77 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 78 if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s) 79 break; 80 if (sp->s_nleft >= s) 81 break; 82 index++; 83 } 84 if (sp >= &stringdope[NSPACE]) 85 errx(1, "String too large"); 86 if (sp->s_topFree == NOSTR) { 87 index = sp - &stringdope[0]; 88 sp->s_topFree = malloc(STRINGSIZE << index); 89 if (sp->s_topFree == NOSTR) 90 errx(1, "No room for space %d", index); 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 { 108 struct strings *sp; 109 int index; 110 111 if (noreset) 112 return; 113 index = 0; 114 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 115 if (sp->s_topFree == NOSTR) 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 { 130 struct strings *sp; 131 132 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) 133 sp->s_topFree = NOSTR; 134 } 135