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

int globalInt = 160;

void usage(char *cmd) {
  error(1, 0, "Usage: %s integer\n", cmd);
}

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

  if ( argc != 2 ) usage(argv[0]);

  // convert the command line arg from a string (in hex) to a long int
  int argVal;
  int retcode = sscanf(argv[1], "%d", &argVal);  // scanf needs places to return values...
  printf("sscanf returned %d\n", retcode);
  if ( retcode != 1 ) usage(argv[0]);    // sscanf returns the number of conversions performed
  printf("sscanf read %d\n", argVal);

  // read <string> <int> from stdin until we get either <something> 0  or an error
  char *str = NULL;
  int      val = 1;
  do {
    printf("<string> <int> please: ");
    retcode = scanf("%d %ms", &val, &str);
    printf("scanf returned %d\n", retcode);
    if ( retcode == 2 )  {
      printf("scanf got %d '%s'\n", val, str);
      free(str);
      str = NULL;
    }
    else {
      fprintf( stderr, "Bad input!\n");  // printing to stderr here
      break;
    }
  } while ( val != 0 );
  
  return EXIT_SUCCESS;
}