#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.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) {
    int color =   errno == ENOENT ? 44
                : errno == EACCES ? 41
                : errno == EISDIR ? 42
                : errno == ELOOP  ? 46
                : errno == ENXIO  ? 45
                                  : 0;

    fprintf(stderr,
      "Failed to open file: \e[%dm%s\e[0m.\n",
      color, strerror(errno));
    return 1;
  }
  printf("File successfully opened.");
  close(fd);
  return 0;
}