Mercurial > hg > early-roguelike
annotate urogue/memory.c @ 280:70aa5808c782
Fix potential segfaults at restore related to ctime().
In some games, restore() passes the result of ctime() to mvprintw() or
some other variadic message-formatting function. If ctime() has not
been declared properly, its return type is inferred to be int instead
of char *. This does not cause a warning because the compiler does not
know the correct type of variadic arguments.
On platforms where ints and pointers are not the same size, this can,
probably depending on alignment, result in a segfault that is not easy
to trace.
Including time.h fixes the problem. Some games manually declared
ctime() and avoided the bug. These declarations have also been
replaced with the include.
author | John "Elwin" Edwards |
---|---|
date | Fri, 15 Sep 2017 20:51:10 -0400 |
parents | c4b12d2d1dcd |
children | b8919055c2fc |
rev | line source |
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256
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1 /* |
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2 memory.c |
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3 |
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4 UltraRogue: The Ultimate Adventure in the Dungeons of Doom |
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5 Copyright (C) 1995 Herb Chong |
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6 All rights reserved. |
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7 |
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8 See the file LICENSE.TXT for full copyright and licensing information. |
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9 */ |
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10 |
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11 #include <stdio.h> |
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12 #include <stdlib.h> |
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13 |
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14 #include "dict.h" |
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15 #include "memory.h" |
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16 #include "rogue.h" |
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17 |
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18 static char sccsid[] = "%W%\t%G%"; |
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19 |
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20 /* Debugging memory allocation code that tries to trap common memory problems |
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21 like overwriting storage and stepping on memory pointer chains. If code |
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22 doesn't use malloc, free, and realloc a lot, these routines can be left in |
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23 as added protection against undetected storage bugs. |
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24 */ |
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25 |
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26 /* FENCE_SIZE should be a multiple of sizeof(size_t) to prevent alignment problems. |
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27 The code assumes that malloc and realloc return pointers aligned at least on size_t |
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28 sized boundaries and that a pointer needs alignment no more strict than that of an |
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29 object needed to hold a size_t. |
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30 */ |
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31 |
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32 #define FENCE_SIZE (sizeof(size_t) * 1024) |
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33 |
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34 static int memdebug_level = 0; |
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35 static DICTIONARY *allocations = NULL; |
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36 static FILE *trace_file = NULL; |
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37 |
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38 /* set the debug level */ |
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39 void mem_debug(const int level) |
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40 { |
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41 memdebug_level = level; |
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42 |
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43 if (trace_file == NULL) |
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44 trace_file = fopen("trace", "w"); |
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45 |
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46 /* all except 0, 1, and unknown fall through */ |
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47 switch(memdebug_level) { |
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48 case 2: |
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49 fprintf(trace_file, "+++ Memory tracking possible, "); |
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50 case 1: |
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51 fprintf(trace_file, "+++ Memory debugging enabled, "); |
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52 break; |
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53 case 0: |
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54 fprintf(trace_file, "+++ Memory debugging disabled, "); |
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55 break; |
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56 default: |
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57 fprintf(trace_file, "!!! Unknown memory debug level set, enabling level 1, "); |
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58 memdebug_level = 1; |
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59 break; |
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60 } |
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61 fprintf(trace_file, "fence size = %d\n", FENCE_SIZE); |
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62 } |
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63 |
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64 /* set memory tracking on or off */ |
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65 /* turning it off deletes all tracking data */ |
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66 void mem_tracking(int flag) |
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67 { |
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68 /* do nothing if debuglevel is too low */ |
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69 if (memdebug_level < 2) |
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70 return; |
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71 |
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72 /* turn on tracking */ |
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73 if (flag > 0) { |
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74 if (allocations != NULL) { |
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75 dict_destroy(allocations); |
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76 allocations = NULL; |
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77 } |
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78 allocations = dict_create(8, 100, 4, 20); |
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79 if (allocations == NULL) { |
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80 fprintf(trace_file, "!!! Unable to allocate tracking table!\n"); |
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81 abort(); |
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82 } |
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83 } |
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84 /* turn off tracking */ |
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85 else if (allocations != NULL) { |
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86 dict_destroy(allocations); |
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87 allocations = NULL; |
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88 } |
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89 } |
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90 |
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91 /* go through all pointers and see if they are OK, aborting if not */ |
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92 /* always returns 1 if not aborting so that it can be included in */ |
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93 /* if statement boolean expressions */ |
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94 int mem_check(char *fname, int linenum) |
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95 { |
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96 STRING_ENTRY *se; |
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97 |
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98 /* scan of a NULL dictionary always succeeds */ |
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99 if (allocations == NULL) |
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100 return TRUE; |
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101 |
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102 if (!dict_scan_begin(allocations)) { |
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103 fprintf(trace_file, "!!! Dictionary scan initialization failed!\n"); |
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104 abort(); |
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105 } |
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106 |
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107 fprintf(trace_file, "\n+++ --- Starting pointer scan\n"); |
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108 fprintf(trace_file, "+++ --- At %s, %d\n", fname, linenum); |
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109 |
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110 /* mem_validate aborts if there is a problem */ |
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111 while((se = dict_scan_next(allocations)) != NULL) |
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112 mem_validate(se->any_ptr); |
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113 |
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114 fprintf(trace_file, "+++ --- Done pointer scan\n\n"); |
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115 |
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116 /* always return a good value if execution arrives here */ |
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117 return 1; |
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118 } |
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119 |
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120 /* allocate some memory and initialize header and trailer */ |
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121 void *mem_malloc(const size_t bytes) |
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122 { |
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123 char *mem_temp; |
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124 size_t real_size = bytes + (FENCE_SIZE << 1); |
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125 |
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126 /* allocate including guard bytes to detect some ways of overwriting of memory areas */ |
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127 mem_temp = (void *)malloc(real_size); |
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128 if (memdebug_level > 0) { |
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129 fprintf(trace_file, "+++ Requested size of %ld bytes\n", bytes); |
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130 fprintf(trace_file, "+++ Actual malloc of %ld bytes located at %p\n", real_size, mem_temp); |
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131 } |
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132 |
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133 /* if allocation succeeded, set management data */ |
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134 if (mem_temp != NULL) { |
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135 size_t i; |
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136 char *end; |
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137 |
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138 /* do beginning marker bytes */ |
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139 for (i = 0; i < FENCE_SIZE - sizeof(size_t); i++) |
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140 *mem_temp++ = 145; |
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141 |
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142 /* save size in header too */ |
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143 if (memdebug_level > 0) |
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144 fprintf(trace_file, "*** Requested memory size stored at %p\n", mem_temp); |
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145 *(size_t *)mem_temp = bytes; |
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146 |
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147 /* finally, point to storage we are going to hand out */ |
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148 mem_temp += sizeof(size_t); |
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149 |
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150 /* now, point to trailer bytes and do them */ |
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151 end = mem_temp + bytes; |
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152 for (i = 0; i < FENCE_SIZE; i++) |
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153 *end++ = 145; |
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154 |
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155 /* now zap contents to zero */ |
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156 for (i = 0; i < bytes; i++) |
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157 mem_temp[i] = 0; |
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158 } |
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159 |
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160 /* track pointer if needed */ |
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161 if (memdebug_level > 1 && allocations != NULL) { |
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162 char key[16]; |
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163 long temp; |
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164 |
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165 sprintf(key, "%p", mem_temp); |
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166 if (dict_insert(allocations, key, 1, (const unsigned long) bytes, mem_temp, &temp) == NULL) { |
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167 fprintf(trace_file, "!!! Insert of pointer tracking info failed\n"); |
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168 abort(); |
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169 } |
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170 } |
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171 |
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172 /* allow caller to do error handling */ |
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173 if (memdebug_level > 0) { |
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174 fprintf(trace_file, "--- Returning pointer of %p\n", mem_temp); |
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175 fflush(trace_file); |
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176 } |
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177 return (void *)mem_temp; |
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178 } |
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179 |
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180 /* release some memory, making sure that it was properly allocated */ |
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181 void mem_free(const void *ptr) |
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182 { |
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183 char *mem_temp; |
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184 size_t mem_size; |
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185 size_t i; |
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186 |
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187 if (memdebug_level > 0) |
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188 fprintf(trace_file, "+++ Free of memory located at %p\n", ptr); |
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189 if (ptr == NULL) { |
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190 if (memdebug_level > 0) { |
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191 fprintf(trace_file, "!!! Freeing NULL pointer\n"); |
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192 fflush(trace_file); |
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193 } |
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194 abort(); |
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195 } |
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196 |
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197 mem_validate(ptr); /* doesn't return on error */ |
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198 |
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199 /* get location of size of area */ |
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200 mem_temp = (char *)ptr - sizeof(size_t); |
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201 |
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202 /* get and calculate real size */ |
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203 mem_size = *(size_t *)mem_temp + (FENCE_SIZE << 1); |
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204 |
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205 /* if doing memory tracking */ |
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206 if (memdebug_level > 1 && allocations != NULL) { |
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207 char key[16]; |
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208 STRING_ENTRY *se; |
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209 long temp; |
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210 |
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211 sprintf(key, "%p", ptr); |
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212 |
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213 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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214 fprintf(trace_file, "!!! Deleting pointer not found in tracking info\n"); |
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215 abort(); |
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216 } |
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217 |
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218 if (se->count == 0) { |
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219 fprintf(trace_file, "!!! Freeing a pointer that has already been freed!\n"); |
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220 abort(); |
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221 } |
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222 else if (se->flags != mem_size - (FENCE_SIZE << 1)) { |
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223 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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224 abort(); |
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225 } |
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226 |
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227 /* remember deleted stuff by zeroing the allocation count */ |
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228 se->count = 0; |
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229 se->flags = 0; |
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230 } |
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231 |
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232 /* zap bytes being freed */ |
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233 for (i = 0, mem_temp = (char *)ptr - FENCE_SIZE; i < mem_size; i++, mem_temp++) |
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234 *mem_temp = 243; |
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235 |
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236 if (memdebug_level > 0) |
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237 fflush(trace_file); |
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238 |
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239 mem_temp = (char *)ptr - FENCE_SIZE; |
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240 free((void *)mem_temp); |
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241 } |
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242 |
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243 /* reallocate some memory, making sure that it was properly allocated */ |
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244 void *mem_realloc(const void *ptr, const size_t new_size) |
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245 { |
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246 char *mem_temp = (char *)ptr; |
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247 size_t real_size = new_size + (FENCE_SIZE << 1); |
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248 size_t mem_size; |
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249 long i; |
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250 |
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251 if (memdebug_level > 0) { |
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252 fprintf(trace_file, "+++ Requested size of %ld bytes\n", new_size); |
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253 fprintf(trace_file, "+++ Actual realloc of %ld bytes located at %p\n", real_size, mem_temp); |
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254 } |
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255 if (ptr == NULL) { |
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256 if (memdebug_level > 0) { |
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257 fprintf(trace_file, "!!! Reallocating NULL pointer\n"); |
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258 fflush(trace_file); |
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259 } |
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260 abort(); |
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261 } |
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262 |
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263 mem_validate(ptr); /* doesn't return on error */ |
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264 |
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265 /* if doing memory tracking */ |
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266 if (memdebug_level > 1 && allocations != NULL) { |
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267 char key[16]; |
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268 STRING_ENTRY *se; |
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269 long temp; |
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270 |
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271 sprintf(key, "%p", ptr); |
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272 |
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273 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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274 fprintf(trace_file, "!!! Deleting a pointer not found in tracking info!\n"); |
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275 abort(); |
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276 } |
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277 |
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278 /* point to size bytes */ |
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279 mem_temp = (char *)ptr - sizeof(size_t); |
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280 |
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281 /* get user size */ |
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282 mem_size = *(size_t *)mem_temp; |
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283 |
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284 if (se->count == 0) { |
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285 fprintf(trace_file, "!!! Freeing a pointer that has already been freed!\n"); |
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286 abort(); |
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287 } |
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288 else if (se->flags != mem_size) { |
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289 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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290 abort(); |
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291 } |
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292 |
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293 /* remember deleted stuff by zeroing the allocation count */ |
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294 se->count = 0; |
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295 se->flags = 0; |
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296 } |
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297 |
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298 |
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299 /* header marker bytes will be copied by the realloc */ |
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300 mem_temp = (char *)ptr - FENCE_SIZE; |
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301 mem_temp = realloc((void *)mem_temp, real_size); |
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302 |
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303 if (mem_temp != NULL) { |
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304 char *end; |
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305 |
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306 /* save size in header too */ |
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307 mem_temp += FENCE_SIZE - sizeof(size_t); |
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308 if (memdebug_level > 0) |
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309 fprintf(trace_file, "*** Requested memory size stored at %p\n", mem_temp); |
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310 *(size_t *)mem_temp = new_size; |
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311 |
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312 /* finally, point to storage we are going to hand out */ |
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313 mem_temp += sizeof(size_t); |
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314 |
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315 /* now, point to trailer bytes and do them */ |
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316 end = mem_temp + new_size; |
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317 for (i = 0; i < FENCE_SIZE; i++) |
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318 *end++ = 145; |
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319 } |
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320 |
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321 if (memdebug_level > 1 && allocations != NULL) { |
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322 char key[16]; |
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323 long temp; |
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324 |
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325 sprintf(key, "%p", mem_temp); |
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326 if (dict_insert(allocations, key, 1, (const unsigned long)new_size, mem_temp, &temp) == NULL) { |
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327 fprintf(trace_file, "!!! Insert of pointer tracking info failed\n"); |
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328 abort(); |
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329 } |
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330 } |
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331 |
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332 if (memdebug_level > 0) { |
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333 fprintf(trace_file, "--- Returning pointer of %p\n", mem_temp); |
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334 fflush(trace_file); |
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335 } |
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336 return (void *)mem_temp; |
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337 } |
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338 |
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339 /* check a pointer to be sure all check bytes are OK. abort if not */ |
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340 /* always returns 1 if not aborting so that it can be included in */ |
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341 /* if statement boolean expressions */ |
257
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256
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342 int mem_validate(const void *ptr) |
256
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343 { |
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344 unsigned char *mem_temp = (unsigned char *)ptr; |
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345 size_t mem_size; |
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346 size_t i; |
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347 |
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348 /* NULL pointers are always valid */ |
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349 if (ptr == NULL) |
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350 return 1; |
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351 |
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352 if (memdebug_level > 0) |
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353 fprintf(trace_file, "+++ Checking %p as pointer\n", ptr); |
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354 |
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355 |
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356 if (memdebug_level > 1 && allocations != NULL) { |
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357 char key[16]; |
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358 STRING_ENTRY *se; |
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359 long temp; |
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360 |
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361 sprintf(key, "%p", ptr); |
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362 |
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363 if ((se = dict_search(allocations, key, &temp)) == NULL) { |
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364 fprintf(trace_file, "!!! Pointer not found in tracking info!\n"); |
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365 abort(); |
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366 } |
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367 |
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368 /* point to size bytes */ |
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369 mem_temp = (unsigned char *)ptr - sizeof(size_t); |
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370 |
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371 /* get user size */ |
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372 mem_size = *(size_t *)mem_temp; |
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373 |
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374 if (se->count == 0) { |
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375 fprintf(trace_file, "!!! Checking pointer has been freed!\n"); |
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376 abort(); |
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377 } |
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378 else if (se->flags != mem_size) { |
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379 fprintf(trace_file, "!!! Stored size different from tracking size!\n"); |
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380 abort(); |
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381 } |
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382 } |
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383 |
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384 /* check the header bytes */ |
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385 mem_temp = (unsigned char *) ptr - FENCE_SIZE; |
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386 if (memdebug_level > 0) |
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|
387 fprintf(trace_file, "+++ Real pointer at %p\n", mem_temp); |
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388 |
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389 |
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390 for (i = 0; i < FENCE_SIZE - sizeof(size_t); i++) |
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391 if (*mem_temp++ != 145) { |
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392 if (memdebug_level > 0) { |
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393 fprintf(trace_file, "!!! The user pointer at %p has been overwritten\n", ptr); |
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394 fprintf(trace_file, "!!! Header offset %ld has been changed\n", i - 1); |
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395 fflush(trace_file); |
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396 } |
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397 abort(); |
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398 } |
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399 |
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400 /* check size */ |
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401 i = *(size_t *)mem_temp; |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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402 if (memdebug_level > 0) |
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403 fprintf(trace_file, "*** Stored memory size of %ld bytes in header\n", i); |
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404 |
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405 |
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406 /* now point to where trailer should be */ |
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407 mem_temp = (unsigned char *)ptr + i; |
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408 for (i = 0; i < FENCE_SIZE; i++) |
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Import UltraRogue from the Roguelike Restoration Project (r1490)
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409 if (*mem_temp++ != 145) { |
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410 if (memdebug_level > 0) { |
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411 fprintf(trace_file, "!!! The user pointer at %p has been overwritten\n", ptr); |
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412 fprintf(trace_file, "!!! Trailer offset %ld has been changed\n", i - 1); |
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413 fflush(trace_file); |
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414 } |
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415 abort(); |
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416 } |
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417 if (memdebug_level > 0) |
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418 fflush(trace_file); |
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419 return 1; |
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420 } |