1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
#if 0
exec cc -Weverything -Wno-vla -o ~/.bin/xx $0
#endif
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
enum {
ASCII = 1,
OFFSETS = 2,
};
int main(int argc, char **argv)
{
size_t cols = 16;
size_t group = 8;
uint8_t flags = ASCII | OFFSETS;
char *path = NULL;
while (getopt(argc, argv, "ac:g:o") > 0)
if (optopt == 'a') {
flags ^= ASCII;
} else if (optopt == 'c') {
cols = (size_t) strtol(optarg, NULL, 10);
if (!cols) return EXIT_FAILURE;
} else if (optopt == 'g') {
group = (size_t) strtol(optarg, NULL, 10);
} else if (optopt == 'o') {
flags ^= OFFSETS;
} else return EXIT_FAILURE;
if (argc > optind)
path = argv[optind];
FILE *file = path ? fopen(path, "r") : stdin;
if (!file) {
perror(path);
return EXIT_FAILURE;
}
uint8_t buf[cols];
size_t offset = 0, n, i;
for (;;) {
n = fread(buf, 1, sizeof(buf), file);
if (flags & OFFSETS)
printf("%08zx: ", offset);
for (i = 0; i < n; ++i) {
if (group && i && !(i % group)) printf(" ");
printf("%02x ", buf[i]);
}
if (flags & ASCII) {
for (i = n; i < cols; ++i)
printf(" ");
printf(" ");
for (i = 0; i < n; ++i)
printf("%c", isprint(buf[i]) ? buf[i] : '.');
}
printf("\n");
offset += n;
if (n < sizeof(buf)) break;
}
if (ferror(file)) {
perror(path);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
|