#include <errno.h>
#include <fcntl.h>
#include <stdio.h>

#include <unistd.h>
int main(int argc, char **argv) {
  if (argc < 2) {
    fprintf(stderr, "No file name given!\n");
    return 1;
  }
  int fd = open(argv[1], O_RDWR);
  if (fd == -1) {
    switch (errno) {
    case ENOENT: fprintf(stderr, "\e[44m"); break;
    case EACCES: fprintf(stderr, "\e[41m"); break;
    case EISDIR: fprintf(stderr, "\e[42m"); break;
    case ELOOP:  fprintf(stderr, "\e[46m"); break;
    case ENXIO:  fprintf(stderr, "\e[45m"); break;
    }
    perror("Failed to open file");
    fprintf(stderr, "\e[0m");

    return 1;
  }
  printf("File successfully opened.");
  close(fd);
  return 0;
}