fluffy

hd.c

 1#include <getopt.h>
 2#include <stdbool.h>
 3#include <stdint.h>
 4#include <stdio.h>
 5#include <string.h>
 6#include "glyphs.h"
 7
 8int dump(FILE *inf, bool verbose) {
 9  uint64_t p = 0;
10  uint8_t buf[32];
11  int offset = 0;
12  int skipping = 0;
13
14  while (!feof(inf)) {
15    uint8_t *bytes = buf + offset;
16    size_t len;
17    int i;
18
19    offset = 16 - offset;
20
21    len = fread(bytes, 1, 16, inf);
22    if (0 == len)
23      break;
24
25    if (!verbose && p && (len == 16) && (0 == memcmp(buf, buf + 16, 16))) {
26      if (!skipping) {
27        printf("⋮\n");
28        skipping = 1;
29      }
30      p += 16;
31      continue;
32    } else {
33      skipping = 0;
34    }
35
36    printf("%08lx  ", (long unsigned int)p);
37    for (i = 0; i < 16; i += 1) {
38      if (i < len) {
39        printf("%02x ", bytes[i]);
40      } else {
41        printf("   ");
42      }
43      if (7 == i) {
44        printf(" ");
45      }
46    }
47    printf(" ");
48    for (i = 0; i < len; i += 1) {
49      printf("%s", fluffyglyphs[bytes[i]]);
50    }
51    if (-1 == printf("\n")) {
52      perror("printf");
53      return 1;
54    }
55    p += len;
56  }
57  printf("%08lx\n", (long unsigned int)p);
58
59  return 0;
60}
61
62int main(int argc, char *argv[]) {
63  FILE *f;
64  bool verbose = false;
65  int c;
66
67  while ((c = getopt(argc, argv, "v")) != -1) {
68    switch (c) {
69      case -1:
70        break;
71      case 'v':
72        verbose = true;
73        break;
74      default:
75        fprintf(stderr, "Usage: %s [-v] [FILENAME]\n", argv[0]);
76        fprintf(stderr, "\n");
77        fprintf(stderr, "-v    Verbose: don't elide output if output lines are identical\n");
78        return 1;
79    }
80  }
81
82  if (!argv[optind] || (0 == strcmp("-", argv[optind]))) {
83    f = stdin;
84  } else {
85    f = fopen(argv[optind], "rb");
86    if (!f) {
87      perror("open");
88      return 1;
89    }
90  }
91
92  dump(f, verbose);
93
94  return 0;
95}