main.c

/*
 *    Copyright (C) 1987, 1988 Chuck Simmons
 *
 * See the file COPYING, distributed with empire, for restriction
 * and warranty information.
 */

/*
main.c -- parse command line for empire

options:

    -w water: percentage of map that is water.  Must be in the range
              10..90.  Default is 70.

    -s smooth: amount of smoothing performed to generate map.  Must
               be a nonnegative integer.  Default is 5.

    -d delay:  number of milliseconds to delay between output.
               default is 2000 (2 seconds).

    -S saveinterval: sets turn interval between saves.
               default is 10
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "empire.h"
#include "extern.h"

#define OPTFLAGS "w:s:d:S:f:"

int main(argc, argv) int argc;
char *argv[];
{
  int c;
  extern char *optarg;
  extern int optind;
  int errflg = 0;
  int wflg, sflg, dflg, Sflg;
  int land;

  wflg = 70; /* set defaults */
  sflg = 5;
  dflg = 2000;
  Sflg = 10;
  savefile = "empsave.dat";

  /*
   * extract command line options
   */

  while ((c = getopt(argc, argv, OPTFLAGS)) != EOF) {
    switch (c) {
      case 'w':
        wflg = atoi(optarg);
        break;
      case 's':
        sflg = atoi(optarg);
        break;
      case 'd':
        dflg = atoi(optarg);
        break;
      case 'S':
        Sflg = atoi(optarg);
        break;
      case 'f':
        savefile = optarg;
        break;
      case '?': /* illegal option? */
        errflg++;
        break;
    }
  }
  if (errflg || (argc - optind) != 0) {
    (void)printf("empire: usage: empire [-w water] [-s smooth] [-d delay]\n");
    exit(1);
  }

  if (wflg < 10 || wflg > 90) {
    (void)printf("empire: -w argument must be in the range 0..90.\n");
    exit(1);
  }
  if (sflg < 0) {
    (void)printf("empire: -s argument must be greater or equal to zero.\n");
    exit(1);
  }

  if (dflg < 0 || dflg > 30000) {
    (void)printf("empire: -d argument must be in the range 0..30000.\n");
    exit(1);
  }

  SMOOTH = sflg;
  WATER_RATIO = wflg;
  delay_time = dflg;
  save_interval = Sflg;

  /* compute min distance between cities */
  land = MAP_SIZE * (100 - WATER_RATIO) / 100; /* available land */
  land /= NUM_CITY;                            /* land per city */
  MIN_CITY_DIST = isqrt(land);                 /* distance between cities */

  empire(); /* call main routine */
  return (0);
}