The scatter program

This program takes the first LINES - 1 lines of characters from the standard input and displays the characters on a terminal screen in a random order. For this program to work properly, the input file should not contain tabs or non-printing characters.

/*
 *	The scatter program.
 */

#include	<ocurses.h>
#include	<sys/types.h>

extern time_t time();

#define MAXLINES 120
#define MAXCOLS  160
char s[MAXLINES][MAXCOLS];		/* Screen Array */
int  T[MAXLINES][MAXCOLS];		/* Tag Array - Keeps track of   *
				 	* the number of characters     *
					 * printed and their positions. */

main()
{
	register int row = 0,col = 0;
	register int c;
	int char_count = 0;
	time_t t;
	void exit(), srand();

	initscr();
	for(row = 0;row < MAXLINES;row++)
		for(col = 0;col < MAXCOLS;col++)
			s[row][col]=' ';

	col = row = 0;
	/* Read screen in */
	while ((c=getchar()) != EOF && row < LINES ) {

		if(c != '\n')
		{
			/* Place char in screen array */
			s[row][col++] = c;
			if(c != ' ')
				char_count++;
		}
		else
		{
			col = 0;
			row++;
		}
	}

	time(&t);	/* Seed the random number generator */
	srand((unsigned)t);

	while (char_count)
	{
		row = rand() % LINES;
		col = (rand() >> 2) % COLS;
		if (T[row][col] != 1 && s[row][col] != ' ')
		{
			move(row, col);
			addch(s[row][col]);
			T[row][col] = 1;
			char_count--;
			refresh();
		}
	}
	endwin();
	exit(0);
}