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annotate mpffs/cat.c @ 41:86a494a5f2b0

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MPFFS description: documented relocated chunks and the journal file
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 05 Jul 2013 03:26:06 +0000
parents 7ceab8bfacb3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * This module contains the main function and other code specific to mpffs-cat
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3 */
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4
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5 #include <sys/types.h>
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6 #include <ctype.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include "types.h"
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13 #include "struct.h"
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14
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15 extern char *imgfile;
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16 extern int verbose;
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17
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18 int cat_v;
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19
35
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20 cat_chunk(chi)
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21 struct chunkinfo *chi;
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22 {
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23 u8 *dp;
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24 size_t len;
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25 int c;
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26
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27 dp = chi->start;
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28 len = chi->len;
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29 while (len) {
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30 c = *dp++;
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31 if (!cat_v || c >= ' ' && c <= '~' || c == '\n')
35
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32 putchar(c);
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33 else {
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34 if (c & 0x80) {
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35 putchar('M');
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36 putchar('-');
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37 c &= 0x7F;
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38 }
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39 putchar('^');
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40 if (c == 0x7F)
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41 putchar('?');
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42 else
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43 putchar(c + '@');
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44 }
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45 len--;
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46 }
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47 }
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48
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49 void
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50 extra_chunk_callback(obj, opaque)
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51 struct objinfo *obj;
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52 u_long opaque;
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53 {
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54 struct chunkinfo chi;
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55
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56 size_extra_chunk(obj, &chi);
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57 cat_chunk(&chi);
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58 }
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59
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60 cat_file(headidx)
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61 {
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62 struct objinfo obj;
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63 struct chunkinfo chi;
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64
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65 obj.entryno = headidx;
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66 get_index_entry(&obj);
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67 if (obj.type != 0xF1) {
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68 fprintf(stderr,
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69 "mpffs-cat: the requested FFS object is not a regular file\n");
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70 exit(1);
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71 }
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72 validate_chunk(&obj);
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73 size_head_chunk(&obj, &chi);
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74 cat_chunk(&chi);
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75 iterate_extra_chunks(obj.descend, extra_chunk_callback, (u_long) 0);
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76 if (cat_v)
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77 putchar('\n');
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78 }
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79
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80 usage()
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81 {
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82 fprintf(stderr, "usage: mpffs-cat [options] ffs-image pathname\n");
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83 exit(1);
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84 }
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85
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86 main(argc, argv)
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87 char **argv;
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88 {
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89 extern int optind;
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90 int idx;
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91
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92 parse_cmdline_options(argc, argv);
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93 if (argc - optind != 2)
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94 usage();
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95 if (verbose) {
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96 cat_v = 1;
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97 verbose--;
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98 }
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99 imgfile = argv[optind];
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100 preliminaries();
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101 idx = find_pathname(argv[optind+1]);
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102 cat_file(idx);
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103 exit(0);
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104 }