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annotate lwar/extract.c @ 264:346966cffeef

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Clean up various warnings when building under -Wall Add some gimmicks to prevent fread() and fwrite() warnings about ignoring the return value. Yes, this is probably not a good thing to do, but doing something with a non-success return value is going to involve crashing out or something anyway. Also fix several warnings about variables used while possibly uninitialized. The code flow shows that this cannot be the case but initializing them to a plausible value at declaration time costs pretty much nothing and it makes gcc happy. Also caught a use of | instead of || which probably would have caused a certain check for duplicate declarations in __os9 sections to behave oddly.
author William Astle <lost@l-w.ca>
date Wed, 06 Feb 2013 21:43:10 -0700
parents 2c24602be78f
children 6f4c4d59666f
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, "r");
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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
264
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, "w");
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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 }