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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#define LINE_LEN 16
static void
dump_line(const char *line, size_t len)
{
/* The amount of bytes we write */
const uint8_t BYTE_COUNT = 2;
for (size_t i = 0; i < LINE_LEN; ++i) {
/* Add padding if needed */
if (i >= (len*BYTE_COUNT)+1) {
printf(" ");
continue;
}
if (i >= len) {
/* Don't print any more bytes */
continue;
}
printf("%02X", line[i] & 0xFF);
if (((i + 1) % BYTE_COUNT) == 0) {
printf(" ");
}
}
printf(" ");
for (size_t i = 0; i < len; ++i) {
if (line[i] > 31 && line[i] < 127) {
printf("%c", line[i]);
} else {
printf(".");
}
}
printf("\n");
}
static void
dump_file(FILE *fp)
{
char *buf = malloc(LINE_LEN * sizeof(char));
ssize_t count;
size_t offset = 0;
for (;;) {
count = fread(buf, sizeof(char), LINE_LEN, fp);
if (count <= 0) {
break;
}
printf("%08X: ", offset);
offset += LINE_LEN*2;
dump_line(buf, count);
}
free(buf);
}
int
main(int argc, char **argv)
{
FILE *fp;
if (argc < 2 || argc > 2) {
printf("Usage: %s <filename>\n", argv[0]);
return 1;
}
fp = fopen(argv[1], "rb");
if (fp == NULL) {
perror("fopen");
return -1;
}
dump_file(fp);
fclose(fp);
return 0;
}
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