/*
 *	chart.c, Version 1.1
 *
 *	This program builds a chart suitable for scanner frequency
 *	entries.  The frequencies are spaced 5 KHz with an area for
 *	a short note about each frequency.  It lists 200 channels on
 *	a page.  Start with a frequency such as 144, 154, etc.  The
 *	chart is output to the screen, printer, or file:
 *
 *		chart 144 149		-	Screen
 *		chart 144 149 twometer	-	File
 *		chart 144 149 prn	-	Printer
 *
 *	Based on a program by Tony B. Anderson, Copyright (c) 1987
 *			All Rights Reserved
 *
 *	Turbo-C Version written by Steve Sampson 75136,626
 *
 *	Fixed frequencies so they are right justified instead of left.
 *	You can use this chart for shortwave now.
 */

#include <stdio.h>
#include <math.h>

static char	top[] = "         ________ ";
static char	bot[] = "|________|";
static double	s1, s2;


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

	if (argc < 3 || argc > 4)  {
		fprintf(stderr, "Usage: chart 'start freq' 'stop freq' [filename]\n");
		exit(1);
	}

	s1 = atof(argv[1]);
	s2 = atof(argv[2]);

	if (s2 < s1)  {
		fprintf(stderr, "chart: Start frequency should be less than Stop\n");
		exit(1);
	}

	if (argc == 4)  {
		if (freopen(argv[3], "w", stdout) == NULL)  {
			fprintf(stderr, "chart: Unable to open output file\n");
			exit(1);
		}
	}

	do  {
		printf("\t\tS C A N N E R   F R E Q U E N C Y   C H A R T\n");
		printf("\t\t---------------------------------------------\n\n");
		printf("%s %s %s %s\n", top, top, top, top);

		for (i = 0; i < 50; i++, s1 += .005000)
			printf("%7.3f %s %7.3f %s %7.3f %s %7.3f %s\n",
			     s1, bot,
			     s1 + .250000, bot,
			     s1 + .500000, bot,
			     s1 + .750000, bot
			);

		putchar('\014');	/* form feed */

	} while (((s1 += .750000) + .005000) < s2);

	exit(0);
}

/* EOF */