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annotate lwar/add.c @ 577:e49d24f4a9a5

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Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents 45df37e81741
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 add.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWAR.
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6
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7 LWAR is free software: you can redistribute it and/or modify it under the
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 Implements the program startup code
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22
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23 */
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24
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25 #include <errno.h>
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26 #include <stdio.h>
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27 #include <stdlib.h>
2
7317fbe024af Clean up insane number of compiler warnings under -Wall
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28 #include <string.h>
0
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29
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30 #include "lwar.h"
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31
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32 void do_add(void)
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33 {
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34 FILE *f;
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35 unsigned char buf[8];
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36 long l;
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37 int c;
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38 FILE *f2;
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39 int i;
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40
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41 f = fopen(archive_file, "rb+");
0
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42 if (!f)
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43 {
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44 if (errno == ENOENT)
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45 {
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46 f = fopen(archive_file, "wb");
0
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47 if (f)
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48 {
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49 fputs("LWAR1V", f);
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50 goto doadd;
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51 }
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52 }
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53 perror("Cannot open archive file");
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54 }
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55
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56 (void)(fread(buf, 1, 6, f) && 1);
0
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57 if (memcmp("LWAR1V", buf, 6))
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58 {
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59 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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60 exit(1);
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61 }
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62
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63 for (;;)
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64 {
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65 c = fgetc(f);
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66 if (c == EOF && ferror(f))
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67 {
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68 perror("Reading archive file");
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69 exit(1);
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70 }
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71 if (c == EOF)
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72 goto doadd;
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73
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74 if (!c)
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75 {
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76 fseek(f, -1, SEEK_CUR);
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77 goto doadd;
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78 }
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79
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80 // find the end of the file name
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81 while (c)
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82 {
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83 c = fgetc(f);
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84 if (c == EOF || ferror(f))
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85 {
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86 fprintf(stderr, "Bad archive file\n");
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87 exit(1);
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88 }
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89 }
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90
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91 // get length of archive member
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92 l = 0;
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93 c = fgetc(f);
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94 l = c << 24;
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95 c = fgetc(f);
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96 l |= c << 16;
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97 c = fgetc(f);
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98 l |= c << 8;
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99 c = fgetc(f);
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100 l |= c;
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101
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102 fseek(f, l, SEEK_CUR);
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103 }
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104 // back up to the NUL byte at the end of the file
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105 fseek(f, -1, SEEK_CUR);
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106 doadd:
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107 for (i = 0; i < nfiles; i++)
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108 {
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109 f2 = fopen(files[i], "rb");
0
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110 if (!f2)
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111 {
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112 fprintf(stderr, "Cannot open file %s:", files[i]);
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113 perror("");
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114 exit(1);
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115 }
264
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116 (void)(fread(buf, 1, 6, f2) && 1);
0
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117 if (mergeflag && !memcmp("LWAR1V", buf, 6))
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118 {
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119 // add archive contents...
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120 for (;;)
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121 {
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122 c = fgetc(f2);
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123 if (c == EOF || ferror(f2))
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124 {
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125 perror("Reading input archive file");
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126 exit(1);
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127 }
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128 if (c == EOF)
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129 break;
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130
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131 if (!c)
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132 {
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133 break;
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134 }
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135
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136 // find the end of the file name
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137 while (c)
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138 {
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139 fputc(c, f);
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140 c = fgetc(f2);
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141 if (c == EOF || ferror(f))
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142 {
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143 fprintf(stderr, "Bad input archive file\n");
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144 exit(1);
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145 }
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146 }
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147 fputc(0, f);
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148
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149 // get length of archive member
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150 l = 0;
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151 c = fgetc(f2);
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152 fputc(c, f);
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153 l = c << 24;
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154 c = fgetc(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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155 fputc(c, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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156 l |= c << 16;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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157 c = fgetc(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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158 fputc(c, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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159 l |= c << 8;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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160 c = fgetc(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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161 fputc(c, f);
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162 l |= c;
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163
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164 while (l)
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165 {
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166 c = fgetc(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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167 fputc(c, f);
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168 l--;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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169 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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170 }
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171
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172 fclose(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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173 continue;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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174 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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175 fseek(f2, 0, SEEK_END);
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176 l = ftell(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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177 fseek(f2, 0, SEEK_SET);
427
45df37e81741 Add option to ignore paths when extracting or adding files with lwar
David Flamand <dlflamand@gmail.com>
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178 fputs(get_file_name(files[i]), f);
0
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179 fputc(0, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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180 fputc(l >> 24, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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181 fputc((l >> 16) & 0xff, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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182 fputc((l >> 8) & 0xff, f);
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183 fputc(l & 0xff, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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184 while (l)
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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185 {
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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186 c = fgetc(f2);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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187 fputc(c, f);
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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188 l--;
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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189 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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190 }
2c24602be78f Initial import from lwtools 3.0.1 version, with new hand built build system and file reorganization
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191
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192 // flag end of file
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193 fputc(0, f);
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194 }