/* enum: enumerate a range of digits or symbols.
 * 
 * for use with a shell programming environment.
 *
 * examples:
 *      % foreach i (`enum 1 9`)
 *	% foreach i (`enum 00 99`)  # future
 *
 * Author: Dave Bakken
 *
 * Wish list for extensions:
 *      1) make it work for letter loops, too (with no real error checking)
 *	      $ for i in `enum a z`	# Bourne shell syntax
 *            % foreach i (`enum A Z`)	# csh syntax
 *
 *      2) make integer params be auto-formatted to the right number of
 *         digits: `enum 1 99` generates 01 02 03 04 ...
 *
 *      3) same as #2, but for letters. Harder... 
 *                 `enum a zzz` generates __a __b .... zzy zzz
 *
 *      4) catch more errors, e.g. `enum 5 3` complains rather than
 *         generating nothing.
 */

#include <stdio.h>
#include <assert.h>

#include "foo.h"  /* needed for external declaration of foo() */
#include "bar.h"  /* needed for external declaration of bar() */

/* stupid main() comment */
main(argc,argv)
int argc;
char *argv[];
{
    int lo, hi, i;

    if (argc != 3) {
	fprintf(stderr,"enum: bad # of parameters\n\tusage: enum low high\n");
	exit(1);
    }

    foo();
    bar();

    /* simple logic, not bullet proof here... */

     /* assumes parameters are digits, not letters, and are well-formed (no errors)
      * It also assume that lo and hi have the same number of digits on the command line*/
     lo=atoi(argv[1]); hi=atoi(argv[2]);

     for (i=lo; i <= hi; i++) {
       printf("%d", i);
       if (i < hi)
          printf(" "); /* put space between enumerated values */
     }

     /* note that we do NOT put a carriage return at the end of the output */
}