/* Program to demonstrate simple error reporting */

#include <stdio.h>  /* for fopen, fprintf */
#include <stdlib.h> /* for EXIT_FAILURE, normally used with exit function */
#include <string.h> /* for strerror */
#include <errno.h>  /* for errno variable */

int
main (int argc, char* argv[])
{

  if (argc != 2)                            /* Verify user command-line input */
  {
    fprintf (stderr, "Usage: %s filename\n",argv[0]);
    return EXIT_FAILURE;
  }
  
  FILE* stream = fopen (argv[1],"r");      /* Open the file named by the user */

  if (stream == NULL)                       /* Verify the open was successful */
  {                                         /* Report a failure */
    fprintf (stderr, "%s: Cannot open %s: %s\n",
             argv[0], argv[1], strerror(errno));
    return EXIT_FAILURE;
  }

  /* stream ready for reading with fread, fgets, etc. ... */

  if (fclose (stream))                       /* Close the file stream */
  {
    fprintf (stderr, "%s: Error closing file %s: %s\n",
             argv[0], argv[1], strerror(errno));
    return EXIT_FAILURE;
  }
  
  return EXIT_SUCCESS;
} // main