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. 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 * @(#)strings.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/mail/strings.c,v 1.2.6.3 2003/01/06 05:46:03 mikeh Exp $ 35 * $DragonFly: src/usr.bin/mail/strings.c,v 1.3 2003/10/04 20:36:48 hmp Exp $ 36 */ 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 #include "extern.h" 48 49 /* 50 * Allocate size more bytes of space and return the address of the 51 * first byte to the caller. An even number of bytes are always 52 * allocated so that the space will always be on a word boundary. 53 * The string spaces are of exponentially increasing size, to satisfy 54 * the occasional user with enormous string size requests. 55 */ 56 57 char * 58 salloc(int size) 59 { 60 char *t; 61 int s, index; 62 struct strings *sp; 63 64 s = size; 65 s += (sizeof(char *) - 1); 66 s &= ~(sizeof(char *) - 1); 67 index = 0; 68 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 69 if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s) 70 break; 71 if (sp->s_nleft >= s) 72 break; 73 index++; 74 } 75 if (sp >= &stringdope[NSPACE]) 76 errx(1, "String too large"); 77 if (sp->s_topFree == NULL) { 78 index = sp - &stringdope[0]; 79 if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL) 80 err(1, "No room for space %d", index); 81 sp->s_nextFree = sp->s_topFree; 82 sp->s_nleft = STRINGSIZE << index; 83 } 84 sp->s_nleft -= s; 85 t = sp->s_nextFree; 86 sp->s_nextFree += s; 87 return (t); 88 } 89 90 /* 91 * Reset the string area to be empty. 92 * Called to free all strings allocated 93 * since last reset. 94 */ 95 void 96 sreset(void) 97 { 98 struct strings *sp; 99 int index; 100 101 if (noreset) 102 return; 103 index = 0; 104 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 105 if (sp->s_topFree == NULL) 106 continue; 107 sp->s_nextFree = sp->s_topFree; 108 sp->s_nleft = STRINGSIZE << index; 109 index++; 110 } 111 } 112 113 /* 114 * Make the string area permanent. 115 * Meant to be called in main, after initialization. 116 */ 117 void 118 spreserve(void) 119 { 120 struct strings *sp; 121 122 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) 123 sp->s_topFree = NULL; 124 } 125