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annotate lwar/extract.c @ 362:d149e2b56981

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Silence tautological comparison warnings Because "char" may be signed or unsigned depending on the system, comparing for byte values 128...255 has to be forced as an unsigned comparison to be portable and clear. Modify two such comparisons in the symbol handling code to treat the symbol offset as a pointer to unsigned. This quiets tautological comparison warnings on systems with an 8 bit signed type as the default char type.
author William Astle <lost@l-w.ca>
date Tue, 26 May 2015 23:42:00 -0600
parents 6f4c4d59666f
children 45df37e81741
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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346966cffeef Clean up various warnings when building under -Wall
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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 }