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/* xxd.c - hexdump.
*
* Copyright 2015 The Android Open Source Project
*
* No obvious standard, output looks like:
* 0000000: 4c69 6e75 7820 7665 7273 696f 6e20 332e Linux version 3.
*
* TODO: support for reversing a hexdump back into the original data.
* TODO: -s seek
USE_XXD(NEWTOY(xxd, ">1c#<1>4096=16l#g#<1=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"
GLOBALS(
long g;
long l;
long c;
)
static void do_xxd(int fd, char *name)
{
long long pos = 0;
int i, len, space;
while (0<(len = readall(fd, toybuf, (TT.l && TT.l-pos<TT.c)?TT.l-pos:TT.c))) {
printf("%08llx: ", pos);
pos += len;
space = 2*TT.c+TT.c/TT.g+1;
for (i=0; i<len;) {
space -= printf("%02x", toybuf[i]);
if (!(++i%TT.g)) {
putchar(' ');
space--;
}
}
printf("%*s", space, "");
for (i=0; i<len; i++)
putchar((toybuf[i]>=' ' && toybuf[i]<='~') ? toybuf[i] : '.');
putchar('\n');
}
if (len<0) perror_exit("read");
}
void xxd_main(void)
{
loopfiles(toys.optargs, do_xxd);
}
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