1 /* $NetBSD: strings.c,v 1.5 1996/06/08 19:48:40 christos 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 static char rcsid[] = "$NetBSD: strings.c,v 1.5 1996/06/08 19:48:40 christos Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 /* 45 * Mail -- a mail program 46 * 47 * String allocation routines. 48 * Strings handed out here are reclaimed at the top of the command 49 * loop each time, so they need not be freed. 50 */ 51 52 #include "rcv.h" 53 #include "extern.h" 54 55 /* 56 * Allocate size more bytes of space and return the address of the 57 * first byte to the caller. An even number of bytes are always 58 * allocated so that the space will always be on a word boundary. 59 * The string spaces are of exponentially increasing size, to satisfy 60 * the occasional user with enormous string size requests. 61 */ 62 63 char * 64 salloc(size) 65 int size; 66 { 67 register char *t; 68 register int s; 69 register struct strings *sp; 70 int index; 71 72 s = size; 73 s += (sizeof (char *) - 1); 74 s &= ~(sizeof (char *) - 1); 75 index = 0; 76 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 77 if (sp->s_topFree == NOSTR && (STRINGSIZE << index) >= s) 78 break; 79 if (sp->s_nleft >= s) 80 break; 81 index++; 82 } 83 if (sp >= &stringdope[NSPACE]) 84 panic("String too large"); 85 if (sp->s_topFree == NOSTR) { 86 index = sp - &stringdope[0]; 87 sp->s_topFree = malloc(STRINGSIZE << index); 88 if (sp->s_topFree == NOSTR) { 89 fprintf(stderr, "No room for space %d\n", index); 90 panic("Internal error"); 91 } 92 sp->s_nextFree = sp->s_topFree; 93 sp->s_nleft = STRINGSIZE << index; 94 } 95 sp->s_nleft -= s; 96 t = sp->s_nextFree; 97 sp->s_nextFree += s; 98 return(t); 99 } 100 101 /* 102 * Reset the string area to be empty. 103 * Called to free all strings allocated 104 * since last reset. 105 */ 106 void 107 sreset() 108 { 109 register struct strings *sp; 110 register int index; 111 112 if (noreset) 113 return; 114 index = 0; 115 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 116 if (sp->s_topFree == NOSTR) 117 continue; 118 sp->s_nextFree = sp->s_topFree; 119 sp->s_nleft = STRINGSIZE << index; 120 index++; 121 } 122 } 123 124 /* 125 * Make the string area permanent. 126 * Meant to be called in main, after initialization. 127 */ 128 void 129 spreserve() 130 { 131 register struct strings *sp; 132 133 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) 134 sp->s_topFree = NOSTR; 135 } 136