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annotate lwar/extract.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:
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0
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1 /*
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2 extract.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
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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
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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
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22 #include <errno.h>
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23 #include <stdio.h>
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24 #include <stdlib.h>
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25 #include <string.h>
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26
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27 #include "lwar.h"
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28
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29 void do_extract(void)
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30 {
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31 FILE *f;
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32 char buf[8];
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33 char *filename;
0
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34 long l;
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35 int c;
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36 char fnbuf[1024];
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37 int i;
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38 FILE *nf;
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39
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40 f = fopen(archive_file, "rb");
0
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41 if (!f)
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42 {
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43 perror("Opening archive file");
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44 exit(1);
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45 }
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46
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47 (void)(fread(buf, 1, 6, f) && 1);
0
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48 if (memcmp("LWAR1V", buf, 6))
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49 {
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50 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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51 exit(1);
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52 }
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54 for (;;)
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55 {
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56 c = fgetc(f);
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57 if (ferror(f))
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58 {
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59 perror("Reading archive file");
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60 exit(1);
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61 }
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62 if (c == EOF)
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63 return;
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64
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65
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66 // find the end of the file name
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67 if (!c)
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68 return;
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69
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70 i = 0;
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71 while (c)
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72 {
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73 fnbuf[i++] = c;
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74 c = fgetc(f);
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75 if (c == EOF || ferror(f))
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76 {
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77 fprintf(stderr, "Bad archive file\n");
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78 exit(1);
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79 }
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80 }
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81 fnbuf[i] = 0;
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82 filename = get_file_name(fnbuf);
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83
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84 // get length of archive member
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85 l = 0;
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86 c = fgetc(f);
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87 l = c << 24;
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88 c = fgetc(f);
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89 l |= c << 16;
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90 c = fgetc(f);
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91 l |= c << 8;
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92 c = fgetc(f);
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93 l |= c;
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94
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95 for (i = 0; i < nfiles; i++)
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96 {
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97 if (!strcmp(get_file_name(files[i]), filename))
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98 break;
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99 }
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100 if (i < nfiles || nfiles == 0)
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101 {
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102 // extract the file
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103 nf = fopen(filename, "wb");
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104 if (!nf)
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105 {
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106 fprintf(stderr, "Cannot extract '%s': %s\n", filename, strerror(errno));
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107 exit(1);
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108 }
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109 while (l)
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110 {
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111 c = fgetc(f);
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112 fputc(c, nf);
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113 l--;
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114 }
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115 fclose(nf);
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116 }
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117 else
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118 {
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119 // skip the file
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120 fseek(f, l, SEEK_CUR);
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121 }
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122 }
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123 }