1 /* $OpenPackages$ */ 2 /* $OpenBSD: buf.c,v 1.19 2003/06/03 02:56:11 millert Exp $ */ 3 /* $NetBSD: buf.c,v 1.9 1996/12/31 17:53:21 christos Exp $ */ 4 5 /* 6 * Copyright (c) 1999 Marc Espie. 7 * 8 * Extensive code changes for the OpenBSD project. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD 23 * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /* 32 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 33 * Copyright (c) 1988, 1989 by Adam de Boor 34 * Copyright (c) 1989 by Berkeley Softworks 35 * All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Adam de Boor. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 /*- 66 * buf.c -- 67 * Functions for automatically-expanded buffers. 68 */ 69 70 #include <ctype.h> 71 #include <stddef.h> 72 #include <string.h> 73 #include "config.h" 74 #include "defines.h" 75 #include "buf.h" 76 #include "stats.h" 77 #include "memory.h" 78 79 #ifdef STATS_BUF 80 #define DO_STAT_BUF(bp, nb) \ 81 STAT_BUFS_EXPANSION++; \ 82 if ((bp)->endPtr - (bp)->buffer == 1) \ 83 STAT_WEIRD_INEFFICIENT++; 84 #else 85 #define DO_STAT_BUF(a, b) 86 #endif 87 88 /* BufExpand(bp, nb) 89 * Expand buffer bp to hold upto nb additional 90 * chars. Makes sure there's room for an extra '\0' char at 91 * the end of the buffer to terminate the string. */ 92 #define BufExpand(bp,nb) \ 93 do { \ 94 size_t occupied = (bp)->inPtr - (bp)->buffer; \ 95 size_t size = (bp)->endPtr - (bp)->buffer; \ 96 DO_STAT_BUF(bp, nb); \ 97 \ 98 do { \ 99 size *= 2 ; \ 100 } while (size - occupied < (nb)+1+BUF_MARGIN); \ 101 (bp)->buffer = (bp)->inPtr = (bp)->endPtr = \ 102 erealloc((bp)->buffer, size); \ 103 (bp)->inPtr += occupied; \ 104 (bp)->endPtr += size; \ 105 } while (0); 106 107 #define BUF_DEF_SIZE 256 /* Default buffer size */ 108 #define BUF_MARGIN 256 /* Make sure we are comfortable */ 109 110 /* the hard case for Buf_AddChar: buffer must be expanded to accommodate 111 * one more char. */ 112 void 113 BufOverflow(bp) 114 Buffer bp; 115 { 116 BufExpand(bp, 1); 117 } 118 119 120 void 121 Buf_AddChars(bp, numBytes, bytesPtr) 122 Buffer bp; 123 size_t numBytes; 124 const char *bytesPtr; 125 { 126 127 if ((size_t)(bp->endPtr - bp->inPtr) < numBytes+1) 128 BufExpand(bp, numBytes); 129 130 memcpy(bp->inPtr, bytesPtr, numBytes); 131 bp->inPtr += numBytes; 132 } 133 134 135 void 136 Buf_Init(bp, size) 137 Buffer bp; 138 size_t size; 139 { 140 #ifdef STATS_BUF 141 STAT_TOTAL_BUFS++; 142 if (size == 0) 143 STAT_DEFAULT_BUFS++; 144 if (size == 1) 145 STAT_WEIRD_BUFS++; 146 #endif 147 if (size == 0) 148 size = BUF_DEF_SIZE; 149 bp->inPtr = bp->endPtr = bp->buffer = emalloc(size); 150 bp->endPtr += size; 151 } 152 153 void 154 Buf_KillTrailingSpaces(bp) 155 Buffer bp; 156 { 157 while (bp->inPtr > bp->buffer + 1 && isspace(bp->inPtr[-1])) { 158 if (bp->inPtr[-2] == '\\') 159 break; 160 bp->inPtr--; 161 } 162 } 163