annotate utils.c @ 174:09cfad6772de

Some minor cosmetic changes relating to ei->itemtype.
author David A. Holland
date Fri, 12 Jun 2015 02:21:28 -0400
parents 4ea0ce804d22
children
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1 /*-
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60184aa42604 add 2013 to copyrights where it seems warranted
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2 * Copyright (c) 2010, 2013 The NetBSD Foundation, Inc.
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3 * All rights reserved.
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4 *
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5 * This code is derived from software contributed to The NetBSD Foundation
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6 * by David A. Holland.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 * 1. Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in the
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15 * documentation and/or other materials provided with the distribution.
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16 *
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17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 * POSSIBILITY OF SUCH DAMAGE.
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28 */
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29
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <assert.h>
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33
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34 #include "utils.h"
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35
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36 #define MALLOCDEBUG
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37
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38 const char ws[] =
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39 " \t\f\v"
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40 ;
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41 const char alnum[] =
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42 "0123456789"
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43 "abcdefghijklmnopqrstuvwxyz"
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44 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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45 "_"
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46 ;
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47
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48 ////////////////////////////////////////////////////////////
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49 // malloc
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50
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51 #define ROUNDUP(len, size) ((size) * (((len) + (size) - 1) / (size)))
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52
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53 #ifdef MALLOCDEBUG
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54
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55 struct mallocheader {
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56 struct mallocheader *self;
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57 size_t len;
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58 };
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59
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60 static
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61 size_t
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62 adjustsize(size_t len)
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63 {
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64 const size_t sz = sizeof(struct mallocheader);
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65 return ROUNDUP(len, sz) + 2*sz;
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66 }
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67
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68 static
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69 void *
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70 placeheaders(void *block, size_t len)
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71 {
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72 struct mallocheader *bothdr, *tophdr;
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73 size_t roundedlen;
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74 void *ret;
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75
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76 roundedlen = ROUNDUP(len, sizeof(struct mallocheader));
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77 bothdr = block;
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78 bothdr->len = len;
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79 bothdr->self = block;
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80 ret = bothdr + 1;
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81 tophdr = (void *)(((unsigned char *)ret) + roundedlen);
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82 tophdr->len = len;
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83 tophdr->self = bothdr;
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84 return ret;
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85 }
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86
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87 static
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88 void *
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89 checkheaders(void *block, size_t len)
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90 {
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91 struct mallocheader *bothdr, *tophdr;
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92 size_t roundedlen;
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93
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94 if (block == NULL) {
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95 assert(len == 0);
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96 return block;
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97 }
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98
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99 roundedlen = ROUNDUP(len, sizeof(struct mallocheader));
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100 bothdr = block;
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101 bothdr--;
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102 assert(bothdr->self == bothdr);
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103 assert(bothdr->len == len);
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104 tophdr = (void *)(((unsigned char *)(bothdr + 1)) + roundedlen);
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105 assert(tophdr->self == bothdr);
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106 assert(tophdr->len == len);
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107 return bothdr;
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108 }
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109
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110 #else
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111
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112 #define adjustsize(len) (len)
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113 #define placeheaders(block, len) ((void)(len), (block))
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114 #define checkheaders(ptr, len) ((void)(len), (ptr))
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115
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116 #endif /* MALLOCDEBUG */
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117
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118 void *
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119 domalloc(size_t len)
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120 {
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121 void *ret;
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122 size_t blocklen;
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123
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124 blocklen = adjustsize(len);
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125 ret = malloc(blocklen);
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126 if (ret == NULL) {
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127 complain(NULL, "Out of memory");
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128 die();
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129 }
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130
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131 return placeheaders(ret, len);
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132 }
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133
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134 void *
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135 dorealloc(void *ptr, size_t oldlen, size_t newlen)
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136 {
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137 void *ret;
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138 void *blockptr;
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139 size_t newblocklen;
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140
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141 blockptr = checkheaders(ptr, oldlen);
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142 newblocklen = adjustsize(newlen);
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143
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144 ret = realloc(blockptr, newblocklen);
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145 if (ret == NULL) {
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146 complain(NULL, "Out of memory");
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147 die();
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148 }
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149
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150 return placeheaders(ret, newlen);
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151 }
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152
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153 void
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154 dofree(void *ptr, size_t len)
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155 {
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156 void *blockptr;
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157
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158 blockptr = checkheaders(ptr, len);
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159 free(blockptr);
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160 }
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161
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162 ////////////////////////////////////////////////////////////
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163 // string allocators
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164
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165 char *
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166 dostrdup(const char *s)
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167 {
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168 char *ret;
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169 size_t len;
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170
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171 len = strlen(s);
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172 ret = domalloc(len+1);
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173 strcpy(ret, s);
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174 return ret;
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175 }
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176
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177 char *
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178 dostrdup2(const char *s, const char *t)
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179 {
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180 char *ret;
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181 size_t len;
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182
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183 len = strlen(s) + strlen(t);
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184 ret = domalloc(len+1);
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185 strcpy(ret, s);
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186 strcat(ret, t);
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187 return ret;
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188 }
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189
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190 char *
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191 dostrdup3(const char *s, const char *t, const char *u)
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192 {
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193 char *ret;
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194 size_t len;
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195
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196 len = strlen(s) + strlen(t) + strlen(u);
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197 ret = domalloc(len+1);
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198 strcpy(ret, s);
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199 strcat(ret, t);
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200 strcat(ret, u);
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201 return ret;
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202 }
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203
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204 char *
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205 dostrndup(const char *s, size_t len)
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206 {
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207 char *ret;
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208
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209 ret = domalloc(len+1);
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210 memcpy(ret, s, len);
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211 ret[len] = '\0';
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212 return ret;
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213 }
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214
39
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215 void
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216 dostrfree(char *s)
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217 {
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218 dofree(s, strlen(s)+1);
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219 }
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220
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ef8bedab8a4b Add malloc debug code.
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221 ////////////////////////////////////////////////////////////
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222 // other stuff
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223
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224 size_t
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225 notrailingws(char *buf, size_t len)
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226 {
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227 while (len > 0 && strchr(ws, buf[len-1])) {
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228 buf[--len] = '\0';
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229 }
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230 return len;
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231 }
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232
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233 bool
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234 is_identifier(const char *str)
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235 {
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236 size_t len;
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237
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238 len = strlen(str);
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239 if (len != strspn(str, alnum)) {
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240 return false;
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241 }
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242 if (str[0] >= '0' && str[0] <= '9') {
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243 return false;
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244 }
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245 return true;
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246 }