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/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-C] [file ...]\n", argv0);
}
#define BYTES_PER_LINE 16
int
main(int argc, char *argv[])
{
int fd;
char c;
int nread;
int pos;
int lastpos;
int i;
char buf[BYTES_PER_LINE];
ARGBEGIN {
case 'v':
break;
case 'C':
break;
default:
usage();
} ARGEND
if (argc < 1 && isatty(STDIN_FILENO)) {
usage();
}
if (isatty(STDIN_FILENO)) {
if ((fd = open(*argv, O_RDONLY)) < 0) {
weprintf("open %s:", *argv);
return 0;
}
} else {
fd = STDIN_FILENO;
}
lastpos = 0;
pos = 0;
while ((nread=read(fd, &c, 1)) >= 0) {
if (nread > 0) {
if (pos % BYTES_PER_LINE == 0) {
printf("%08x ", pos);
}
printf(" %02x", c & 0xFF );
buf[pos%BYTES_PER_LINE] = c;
pos++;
} else {
if (lastpos == 0) {
lastpos = pos;
}
printf(" ");
pos++;
}
if (pos % BYTES_PER_LINE == BYTES_PER_LINE/2) {
printf(" ");
}
if (pos % BYTES_PER_LINE == 0) {
printf(" |");
if (nread == 0) {
pos = lastpos;
}
for (i = 0; i <= (pos+BYTES_PER_LINE-1) % BYTES_PER_LINE; i++) {
if (isprint(buf[i]) ) {
putchar(buf[i]);
} else {
putchar('.');
}
}
puts("|");
if (nread == 0) {
goto END;
}
}
}
END:
printf("%08x\n", pos);
if (fd > STDERR_FILENO) {
close(fd);
}
return 0;
}
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