1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93"; 35 #endif 36 #endif /* not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 /* 41 * Mail -- a mail program 42 * 43 * String allocation routines. 44 * Strings handed out here are reclaimed at the top of the command 45 * loop each time, so they need not be freed. 46 */ 47 48 #include "rcv.h" 49 #include "extern.h" 50 51 struct strings stringdope[NSPACE]; 52 53 /* 54 * Allocate size more bytes of space and return the address of the 55 * first byte to the caller. An even number of bytes are always 56 * allocated so that the space will always be on a word boundary. 57 * The string spaces are of exponentially increasing size, to satisfy 58 * the occasional user with enormous string size requests. 59 */ 60 61 char * 62 salloc(int size) 63 { 64 char *t; 65 int s, index; 66 struct strings *sp; 67 68 s = size; 69 s += (sizeof(char *) - 1); 70 s &= ~(sizeof(char *) - 1); 71 index = 0; 72 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 73 if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s) 74 break; 75 if (sp->s_nleft >= s) 76 break; 77 index++; 78 } 79 if (sp >= &stringdope[NSPACE]) 80 errx(1, "String too large"); 81 if (sp->s_topFree == NULL) { 82 index = sp - &stringdope[0]; 83 if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL) 84 err(1, "No room for space %d", index); 85 sp->s_nextFree = sp->s_topFree; 86 sp->s_nleft = STRINGSIZE << index; 87 } 88 sp->s_nleft -= s; 89 t = sp->s_nextFree; 90 sp->s_nextFree += s; 91 return (t); 92 } 93 94 /* 95 * Reset the string area to be empty. 96 * Called to free all strings allocated 97 * since last reset. 98 */ 99 void 100 sreset(void) 101 { 102 struct strings *sp; 103 int index; 104 105 if (noreset) 106 return; 107 index = 0; 108 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) { 109 if (sp->s_topFree == NULL) 110 continue; 111 sp->s_nextFree = sp->s_topFree; 112 sp->s_nleft = STRINGSIZE << index; 113 index++; 114 } 115 } 116 117 /* 118 * Make the string area permanent. 119 * Meant to be called in main, after initialization. 120 */ 121 void 122 spreserve(void) 123 { 124 struct strings *sp; 125 126 for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) 127 sp->s_topFree = NULL; 128 } 129