mcview sim

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#define NR 16

int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "args error!\n");
    exit(-1);
  }

  FILE *file = fopen(argv[1], "rb");
  if (file == NULL) {
    perror("opening error");
    exit(-1);
  }

  while (!feof(file)) {
    uint8_t buffer[NR] = {};
    printf("%08lX: ", ftell(file));
    fread(buffer, sizeof(*buffer), NR, file);
    for (int i = 0; i < NR; i++) {
      printf("%02X ", buffer[i]);
    }

    putchar('|');
    for (int i = 0; i < NR; i++) {
      if (buffer[i] >= 32) {
        putchar(buffer[i]);
      } else {
        putchar('.');
      }
    }
    puts("|");
  }

  if (fclose(file) == EOF) {
    perror(NULL);
  }
  return 0;
}