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

#ifndef DONT_USE_SYSTEM_SYSEXITS
#	include <sysexits.h>
#else
#	include "../include/sysexits.h"
#endif /* ifndef DONT_USE_SYSTEM_SYSEXITS */

#include <time.h>

static char *program_name = "roll";

/* change these to watch the world burn */
#define ROLLS_BASE 10
#define SIDES_BASE 10

int main(int argc, char *argv[]){
	char *argv0;
	char *argvc;
	char *ep;
	extern int errno;
	int r; /* rolls */
	int s; /* sides */

	argv0 = argv[0];

	if(argc < 2){
		fprintf(stderr,
			"Usage: %s [dice...]\n"
			"\tDice should be formatted [rolls]d[sides], e.g. 1d3, 5d6...\n",
			argv0 == NULL ? program_name : argv0
		);
		return EX_USAGE;
	}

	srand(time(NULL));

	while(--argc > 0){
		argvc = *++argv;

		/* Parse out [rolls]d[sides] */
		if(!isdigit(**argv)){
error:			fprintf(stderr,
				"%s: %s: Improperly formatted die (should be"
				" [rolls]d[sides]).\n",
				argv0, argvc
			);
			return EX_USAGE;
		}

		errno = 0;
		r = strtol(*argv, &ep, ROLLS_BASE);

		if(errno != 0){
range:			fprintf(stderr,
				"%s: %s: Number out of working range for this"
				" program.\n",
				argv0, argvc
			);
			return EX_SOFTWARE;
		}

		if(*(*argv = ep) != 'd' || !isdigit(*(++*argv)))
			goto error;

		s = strtol(*argv, &ep, SIDES_BASE);
		if(errno != 0)
			goto range;
		if(*ep != '\0')
			goto error;

		while(r --> 0)
			fprintf(stdout, "%d\n", rand() % s + 1);
	}

	return EX_OK;
}