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

void do_something_with_a_file(FILE *file) {
  char buffer[500] = { 0 };
  while (fgets(buffer, 500, file)) {
    fputs(buffer, STDOUT);
  }
}
int main(int argc, char *argv[argc + 1]) {
  if (argc < 2) {
    printf("Usage: %s <file to open>\n", argv[0]);
    return EXIT_FAILURE;
  }
  char *file_to_open = argv[1];
  FILE *file = fopen(file_to_open, "r");
  if (file) {
    do_something_with_a_file(file);
    fclose(file);
  } else {
    perror("Oh noes! Failed to open file");
    return EXIT_FAILURE;
  }
  return EXIT_SUCCESS;
}