read file as binary format

read_bin.cc

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[]) {
  if (argc != 2) {
    printf("%s\n", "wrong number of parameters");
    exit(-1);
  }

  FILE *file_ptr = fopen(argv[1], "rb");

  fseek(file_ptr, 0, SEEK_END);
  long file_size = ftell(file_ptr);
  rewind(file_ptr);

  char *file_content = (char *)malloc(file_size);

  if (file_content == NULL) {
    printf("%s\n", "fail to malloc");
    exit(-1);
  }

  fread(file_content, 1, file_size, file_ptr);

  char *ret_file_name = (char *)malloc(strlen(argv[1]) + 4);
  strcpy(ret_file_name, argv[1]);
  strcat(ret_file_name, "_ret");

  FILE *ret_file_ptr = fopen(ret_file_name, "wb");
  fwrite(file_content, 1, file_size, ret_file_ptr);

  return 0;
}