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annotate lwar/extract.c @ 273:1409debcb1a0

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Fix crash on listing when nested noexpand macros are used Macros flagged noexpand were causing a segfault during listing. The problem was incorrect accounting for nesting levels for noexpand macros causing the listing handler to fall off the end of the program in certain circumstances and in other circumstances it would fail to suppress expansion. Both the segfault in the case of misbehaviour and the misbhaviour itself are corrected with this update. If you do not use nested noexpand macros, this bug has no effect.
author William Astle <lost@l-w.ca>
date Sat, 25 May 2013 13:35:46 -0600
parents 6f4c4d59666f
children 45df37e81741
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 long l;
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34 int c;
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35 char fnbuf[1024];
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36 int i;
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37 FILE *nf;
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38
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39 f = fopen(archive_file, "rb");
0
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40 if (!f)
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41 {
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42 perror("Opening archive file");
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43 exit(1);
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44 }
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45
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46 (void)(fread(buf, 1, 6, f) && 1);
0
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47 if (memcmp("LWAR1V", buf, 6))
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48 {
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49 fprintf(stderr, "%s is not a valid archive file.\n", archive_file);
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50 exit(1);
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51 }
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52
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53 for (;;)
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54 {
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55 c = fgetc(f);
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56 if (ferror(f))
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57 {
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58 perror("Reading archive file");
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59 exit(1);
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60 }
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61 if (c == EOF)
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62 return;
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63
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64
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65 // find the end of the file name
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66 if (!c)
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67 return;
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68
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69 i = 0;
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70 while (c)
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71 {
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72 fnbuf[i++] = c;
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73 c = fgetc(f);
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74 if (c == EOF || ferror(f))
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75 {
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76 fprintf(stderr, "Bad archive file\n");
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77 exit(1);
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78 }
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79 }
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80 fnbuf[i] = 0;
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81
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82 // get length of archive member
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83 l = 0;
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84 c = fgetc(f);
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85 l = c << 24;
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86 c = fgetc(f);
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87 l |= c << 16;
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88 c = fgetc(f);
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89 l |= c << 8;
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90 c = fgetc(f);
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91 l |= c;
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92
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93 for (i = 0; i < nfiles; i++)
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94 {
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95 if (!strcmp(files[i], fnbuf))
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96 break;
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97 }
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98 if (i < nfiles || nfiles == 0)
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99 {
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100 // extract the file
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101 nf = fopen(fnbuf, "wb");
0
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102 if (!nf)
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103 {
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104 fprintf(stderr, "Cannot extract '%s': %s\n", fnbuf, strerror(errno));
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105 exit(1);
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106 }
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107 while (l)
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108 {
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109 c = fgetc(f);
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110 fputc(c, nf);
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111 l--;
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112 }
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113 fclose(nf);
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114 }
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115 else
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116 {
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117 // skip the file
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118 fseek(f, l, SEEK_CUR);
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119 }
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120 }
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121 }