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
74
75
76
77
78
79
80
81
82
|
/* xxd.c - hexdump.
*
* Copyright 2015 The Android Open Source Project
*
* TODO: support for reversing a hexdump back into the original data.
* TODO: support > 4GiB files?
* TODO: -s seek
USE_XXD(NEWTOY(xxd, ">1c#<0=16l#g#<0=2", TOYFLAG_USR|TOYFLAG_BIN))
config XXD
bool "xxd"
default n
help
usage: xxd [-c n] [-g n] [-l n] [file]
Hexdump a file to stdout. If no file is listed, copy from stdin.
Filename "-" is a synonym for stdin.
-c n Show n bytes per line (default 16).
-g n Group bytes by adding a ' ' every n bytes (default 2).
-l n Limit of n bytes before stopping (default is no limit).
*/
#define FOR_xxd
#include "toys.h"
static const char* hex_digits = "0123456789abcdef";
GLOBALS(
long bytes_per_group; // -g
long limit; // -l
long bytes_per_line; // -c
)
static void xxd_file(FILE *fp)
{
// "0000000: 4c69 6e75 7820 7665 7273 696f 6e20 332e Linux version 3.".
size_t hex_size = 8 + 2 +
2*TT.bytes_per_line + TT.bytes_per_line/TT.bytes_per_group + 1;
size_t line_size = hex_size + TT.bytes_per_line + 1;
char *line = xmalloc(line_size);
int offset = 0, bytes_this_line = 0, index = 0, ch;
memset(line, ' ', line_size);
line[line_size - 1] = 0;
while ((ch = getc(fp)) != EOF) {
if (!bytes_this_line) index = sprintf(line, "%08x: ", offset);
++offset;
line[index++] = hex_digits[(ch >> 4) & 0xf];
line[index++] = hex_digits[ch & 0xf];
line[hex_size + bytes_this_line] = (ch >= ' ' && ch <= '~') ? ch : '.';
++bytes_this_line;
if (bytes_this_line == TT.bytes_per_line) {
puts(line);
memset(line, ' ', line_size - 1);
bytes_this_line = 0;
} else if (!(bytes_this_line % TT.bytes_per_group)) line[index++] = ' ';
if ((toys.optflags & FLAG_l) && offset == TT.limit) break;
}
if (bytes_this_line) {
line[hex_size + bytes_this_line] = 0;
puts(line);
}
if (CFG_FREE) free(line);
}
void xxd_main(void)
{
FILE *fp;
if (!*toys.optargs || !strcmp(*toys.optargs, "-")) fp = stdin;
else fp = xfopen(*toys.optargs, "r");
xxd_file(fp);
fclose(fp);
}
|
