/* Standard include files */

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


/* Command line argument variables */

char *pcFilename = NULL;
double dArg = 0.0;
int iArg = 0;
int iFlag = 0;


/***************************************/
/* Print usage statement               */
/***************************************/

void Usage(void)
{
  /* Print message with program arguments */
  fprintf(stderr, "usage: parseargs [-file <filename>] [-double <arg>] [-int <arg>] [-flag]\n");
}


/***************************************/
/* Parse command line arguments        */
/* Input is argc and argv from main    */
/* Fill in global variables            */
/* Return 1 for success, 0 for failure */
/***************************************/

int ParseArguments(int argc, char **argv) 
{
  /* Skip over program name */
  argc--; argv++;

  /* Loop through command line words */
  while (argc > 0) {
    if (!strcmp(*argv, "-file")) { argv++; argc--; pcFilename = *argv; }
    else if (!strcmp(*argv, "-int")) { argv++; argc--; iArg = atoi(*argv); }
    else if (!strcmp(*argv, "-double")) { argv++; argc--; dArg = atof(*argv); }
    else if (!strcmp(*argv, "-flag")) { iFlag = 1; }
    else {
      fprintf(stderr, "Unrecognized recognized command line argument: %s\n", *argv);
      Usage();
      return 0;
    }
    argv++; argc--;
  }
  
  /* Return success */
  return 1;
}


/******************************************/
/* Main program                           */
/* Parse arguments into global variables  */
/* Print results                          */
/******************************************/

int main(int argc, char **argv)
{
  /* Parse arguments */
  if (!ParseArguments(argc, argv)) return -1;

  /* Print results */
  if (pcFilename) printf("%s ", pcFilename);
  else printf("<stdin> ");
  printf("%g %d %d\n", dArg, iArg, iFlag);

  /* Return success */
  return 0;
}