1 /* 2 * Copyright (c) 1980, 1993 3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)strings.c 8.1 (Berkeley) 6/6/93 30 * $FreeBSD: src/usr.bin/mail/strings.c,v 1.2.6.3 2003/01/06 05:46:03 mikeh Exp $ 31 * $DragonFly: src/usr.bin/mail/strings.c,v 1.3 2003/10/04 20:36:48 hmp Exp $ 32 */ 33 34 /* 35 * Mail -- a mail program 36 * 37 * String allocation routines. 38 * Strings handed out here are reclaimed at the top of the command 39 * loop each time, so they need not be freed. 40 */ 41 42 #include "rcv.h" 43 #include "extern.h" 44 45 /* 46 * Allocate size more bytes of space and return the address of the 47 * first byte to the caller. An even number of bytes are always 48 * allocated so that the space will always be on a word boundary. 49 * The string spaces are of exponentially increasing size, to satisfy 50 * the occasional user with enormous string size requests. 51 */ 52 53 char * 54 salloc(int size) 55 { 56 char *t; 57 int s, index; 58 struct strings *sp; 59 60 s = size; 61 s += (sizeof(char *) - 1); 62 s &= ~(sizeof(char *) - 1); 63 index = 0; 64 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 65 if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s) 66 break; 67 if (sp->s_nleft >= s) 68 break; 69 index++; 70 } 71 if (sp >= &stringdope[NSPACE]) 72 errx(1, "String too large"); 73 if (sp->s_topFree == NULL) { 74 index = sp - &stringdope[0]; 75 if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL) 76 err(1, "No room for space %d", index); 77 sp->s_nextFree = sp->s_topFree; 78 sp->s_nleft = STRINGSIZE << index; 79 } 80 sp->s_nleft -= s; 81 t = sp->s_nextFree; 82 sp->s_nextFree += s; 83 return (t); 84 } 85 86 /* 87 * Reset the string area to be empty. 88 * Called to free all strings allocated 89 * since last reset. 90 */ 91 void 92 sreset(void) 93 { 94 struct strings *sp; 95 int index; 96 97 if (noreset) 98 return; 99 index = 0; 100 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 101 if (sp->s_topFree == NULL) 102 continue; 103 sp->s_nextFree = sp->s_topFree; 104 sp->s_nleft = STRINGSIZE << index; 105 index++; 106 } 107 } 108 109 /* 110 * Make the string area permanent. 111 * Meant to be called in main, after initialization. 112 */ 113 void 114 spreserve(void) 115 { 116 struct strings *sp; 117 118 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) 119 sp->s_topFree = NULL; 120 } 121