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annotate lwar/list.c @ 389:2d9b7ae6c329

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Throw error if address overflows in extended mode This may or may not cause extra problems due to sloppiness in dealing with calculations that overflow in 16 bits. However, presumably it is a good idea so unless something major pops up, it seems like a good idea. Thanks to Erik G <erik@6809.org> for the patch.
author William Astle <lost@l-w.ca>
date Mon, 13 Jul 2015 21:37:49 -0600
parents 6f4c4d59666f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 list.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 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>
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28 #include <string.h>
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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_list(void)
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33 {
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34 FILE *f;
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35 char buf[8];
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36 long l;
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37 int c;
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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 while (c)
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70 {
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71 putchar(c);
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72 c = fgetc(f);
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73 if (c == EOF || ferror(f))
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74 {
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75 fprintf(stderr, "Bad archive file\n");
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76 exit(1);
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77 }
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78 }
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79
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80 // get length of archive member
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81 l = 0;
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82 c = fgetc(f);
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83 l = c << 24;
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84 c = fgetc(f);
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85 l |= c << 16;
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86 c = fgetc(f);
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87 l |= c << 8;
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88 c = fgetc(f);
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89 l |= c;
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90 printf(": %04lx bytes\n", l);
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91 fseek(f, l, SEEK_CUR);
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92 }
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93 }