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/* 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#l#g#", 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;
int bytes_this_line = 0;
int line_index = 0;
int ch;
memset(line, ' ', line_size);
line[line_size - 1] = 0;
while ((ch = getc(fp)) != EOF) {
if (bytes_this_line == 0) line_index = sprintf(line, "%08x: ", offset);
++offset;
line[line_index++] = hex_digits[(ch >> 4) & 0xf];
line[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) == 0) {
line[line_index++] = ' ';
}
if ((toys.optflags & FLAG_l) && offset == TT.limit) {
break;
}
}
if (bytes_this_line != 0) {
line[hex_size + bytes_this_line] = 0;
puts(line);
}
if (CFG_FREE) free(line);
}
void xxd_main(void)
{
FILE *fp;
if (!TT.bytes_per_line) TT.bytes_per_line = 16;
else if (TT.bytes_per_line < 0)
error_exit("invalid -c value: %d", TT.bytes_per_line);
if (!TT.bytes_per_group) TT.bytes_per_group = 2;
else if (TT.bytes_per_group < 0)
error_exit("invalid -g value: %d", TT.bytes_per_group);
if (!*toys.optargs || !strcmp(*toys.optargs, "-")) fp = stdin;
else fp = xfopen(*toys.optargs, "r");
xxd_file(fp);
fclose(fp);
}
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