hexdump in c

hexdump.c

#include <stdio.h>

#define MIN(A,B) ((A) < (B) ? (A) : (B))
void hexdump(void *buf, int size) {
  unsigned char *ptr;
  int i, j, len = 0;
  for (i = 0; i < size; i += len) {
    ptr = buf + i;
    len = MIN(16, size - i);
    printf("%04x | ", i);
    for (j = 0; j < len; j++) {
      printf("%02x ", ptr[j]);
    }
    printf("\n");
  }
}

int main() {
  unsigned char buf[256];
  int i;
  for (i = 0; i < 256; i++) buf[i] = (unsigned char)i;

  hexdump (buf, 256);
  return 0;
}