File: cmatrix.c

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cmatrix 1.2a-3
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/**************************************************************************
 *   cmatrix.c                                                            *
 *                                                                        *
 *   Copyright (C) 1999 Chris Allegretta                                  *
 *   This program is free software; you can redistribute it and/or modify *
 *   it under the terms of the GNU General Public License as published by *
 *   the Free Software Foundation; either version 1, or (at your option)  *
 *   any later version.                                                   *
 *                                                                        *
 *   This program is distributed in the hope that it will be useful,      *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 *   GNU General Public License for more details.                         *
 *                                                                        *
 *   You should have received a copy of the GNU General Public License    *
 *   along with this program; if not, write to the Free Software          *
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.            *
 *                                                                        *
 **************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <signal.h>

#include "config.h"

#ifdef HAVE_NCURSES_H
#include <ncurses.h>
#else				/* Uh oh */
#include <curses.h>
#endif				/* CURSES_H */

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif				/* HAVE_SYS_IOCTL_H */

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif				/* HAVE_UNISTD_H */

#ifdef HAVE_TERMIOS_H
#include <termios.h>
#endif				/* HAVE_TERMIOS_H */

#ifdef HAVE_TERMIO_H
#include <termio.h>
#endif				/* HAVE_TERMIO_H */



/* Matrix typedef */
typedef struct cmatrix {
    int val;
    int bold;
} cmatrix;

/* Global variables, unfortunately */
int console = 0, xwindow = 0;		/* Are we in the console? X? */
cmatrix **matrix = (cmatrix **) NULL;   /* The matrix has you */
int *length = NULL;			/* Length of cols in each line */
int *spaces = NULL;			/* spaces left to fill */
int *updates = NULL;			/* What does this do again? :) */

int va_system(char *str, ...)
{

    va_list ap;
    char foo[133];

    va_start(ap, str);
    vsnprintf(foo, 132, str, ap);
    va_end(ap);
    return system(foo);
}

/* What we do when we're all set to exit */
RETSIGTYPE finish(int sigage)
{
    curs_set(1);
    clear();
    refresh();
    resetty();
    endwin();
#ifdef HAVE_CONSOLECHARS
    if (console)
	va_system("consolechars -d");
#elif defined(HAVE_SETFONT)
    if (console)
	va_system("setfont");
#endif
    exit(0);
}

/* What we do when we're all set to exit */
RETSIGTYPE c_die(char *msg, ...)
{
    va_list ap;

    curs_set(1);
    clear();
    refresh();
    resetty();
    endwin();
#ifdef HAVE_CONSOLECHARS
    if (console)
	va_system("consolechars -d");
#elif defined(HAVE_SETFONT)
    if (console)
	va_system("setfont");
#endif

    va_start(ap, msg);
    vfprintf(stderr, "%s", ap);
    va_end(ap);
    exit(0);
}

void usage(void)
{
    printf(" Usage: cmatrix -[abBfhlsVx] [-u delay] [-C color]\n");
    printf(" -a: Asynchronous scroll\n");
    printf(" -b: Bold characters on\n");
    printf(" -B: All bold characters (overrides -b)\n");
    printf(" -f: Force the linux $TERM type to be on\n");
    printf(" -l: Linux mode (uses matrix console font)\n");
    printf(" -o: Use old-style scrolling\n");
    printf(" -h: Print usage and exit\n");
    printf(" -n: No bold characters (overrides -b and -B, default)\n");
    printf(" -s: \"Screensaver\" mode, exits on first keystroke\n");
    printf(" -x: X window mode, use if your xterm is using mtx.pcf\n");
    printf(" -V: Print version information and exit\n");
    printf(" -u delay (0 - 10, default 4): Screen update delay\n");
    printf(" -C [color]: Use this color for matrix (default green)\n");
}

void version(void)
{
    printf(" CMatrix version %s by Chris Allegretta (compiled %s, %s)\n",
	   VERSION, __TIME__, __DATE__);
    printf(" Email: cmatrix@asty.org  Web: http://www.asty.org/cmatrix\n");
}


/* nmalloc from nano by Big Gaute */
void *nmalloc(size_t howmuch)
{
    void *r;

    /* Panic save? */

    if (!(r = malloc(howmuch)))
	c_die("CMatrix: malloc: out of memory!");

    return r;
}

/* Initialize the global variables */
RETSIGTYPE var_init(void)
{
    int i, j;

    if (matrix != NULL)
	free(matrix);

    matrix = nmalloc(sizeof(cmatrix) * (LINES + 1));
    for (i = 0; i <= LINES; i++)
	matrix[i] = nmalloc(sizeof(cmatrix) * COLS);

    if (length != NULL)
	free(length);
    length = nmalloc(COLS * sizeof(int));

    if (spaces != NULL)
	free(spaces);
    spaces = nmalloc(COLS* sizeof(int));

    if (updates != NULL)
	free(updates);
    updates = nmalloc(COLS * sizeof(int));

    /* Make the matrix */
    for (i = 0; i <= LINES; i++)
	for (j = 0; j <= COLS - 1; j += 2)
	    matrix[i][j].val = -1;

    for (j = 0; j <= COLS - 1; j += 2) {
	/* Set up spaces[] array of how many spaces to skip */
	spaces[j] = (int) rand() % LINES + 1;

	/* And length of the stream */
	length[j] = (int) rand() % (LINES - 3) + 3;

	/* Sentinel value for creation of new objects */
	matrix[1][j].val = ' ';

	/* And set updates[] array for update speed. */
	updates[j] = (int) rand() % 3 + 1;
    }

}

void handle_sigwinch(int s)
{
    char *tty = NULL;
    int fd = 0;
    int result = 0;
    struct winsize win;

    tty = ttyname(0);
    if (!tty)
	return;
    fd = open(tty, O_RDWR);
    if (fd == -1)
	return;
    result = ioctl(fd, TIOCGWINSZ, &win);
    if (result == -1)
	return;

    COLS = win.ws_col;
    LINES = win.ws_row;

#ifdef HAVE_RESIZETERM
    resizeterm(LINES, COLS);
#ifdef HAVE_WRESIZE
    if (wresize(stdscr, LINES, COLS) == ERR)
	c_die("Cannot resize window!");
#endif				/* HAVE_WRESIZE */
#endif				/* HAVE_RESIZETERM */

    var_init();
    /* Do these b/c width may have changed... */
    clear();
    refresh();

}

int main(int argc, char *argv[])
{
    int i, j = 0, count = 0, screensaver = 0, asynch = 0, bold = -1,
	force = 0, y, z, firstcoldone = 0, oldstyle = 0, random =
	0, update = 4, highnum = 0, mcolor = COLOR_GREEN, randnum =
	0, randmin = 0;

    char *oldtermname, *syscmd = NULL;
    int optchr, keypress;

	sigset_t sigs;

	sigemptyset(&sigs);
	sigaddset(&sigs, SIGWINCH);

    /* Many thanks to morph- (morph@jmss.com) for this getopt patch */
    opterr = 0;
    while ((optchr = getopt(argc, argv, "abBfhlnosxVu:C:")) != EOF) {
	switch (optchr) {
	case 's':
	    screensaver = 1;
	    break;
	case 'a':
	    asynch = 1;
	    break;
	case 'b':
	    if (bold != 2 && bold != 0)
		bold = 1;
	    break;
	case 'B':
	    if (bold != 0)
		bold = 2;
	    break;
	case 'C':
	    if (!strcasecmp(optarg, "green"))
		mcolor = COLOR_GREEN;
	    else if (!strcasecmp(optarg, "red"))
		mcolor = COLOR_RED;
	    else if (!strcasecmp(optarg, "blue"))
		mcolor = COLOR_BLUE;
	    else if (!strcasecmp(optarg, "white"))
		mcolor = COLOR_WHITE;
	    else if (!strcasecmp(optarg, "yellow"))
		mcolor = COLOR_YELLOW;
	    else if (!strcasecmp(optarg, "cyan"))
		mcolor = COLOR_CYAN;
	    else if (!strcasecmp(optarg, "magenta"))
		mcolor = COLOR_MAGENTA;
	    else if (!strcasecmp(optarg, "black"))
		mcolor = COLOR_BLACK;
	    else {
		printf(" Invalid color selection\n Valid "
		       "colors are green, red, blue, "
		       "white, yellow, cyan, magenta " "and black.\n");
		exit(1);
	    }
	    break;
	case 'f':
	    force = 1;
	    break;
	case 'l':
	    console = 1;
	    break;
	case 'n':
	    bold = 0;
	    break;
	case 'h':
	case '?':
	    usage();
	    exit(0);
	case 'o':
	    oldstyle = 1;
	    break;
	case 'u':
	    update = atoi(optarg);
	    break;
	case 'x':
	    xwindow = 1;
	    break;
	case 'V':
	    version();
	    exit(0);
	}
    }

    /* If bold hasn't been turned on or off yet, assume off */
    if (bold == -1)
	bold = 0;

    oldtermname = getenv("TERM");
    if (force && strcmp("linux", getenv("TERM"))) {
	/* Portability wins out here, apparently putenv is much more
	   common on non-Linux than setenv */
	putenv("TERM=linux");
    }
    initscr();
    savetty();
    nonl();
    cbreak();
    noecho();
    timeout(0);
    leaveok(stdscr, TRUE);
    curs_set(0);
    signal(SIGINT, finish);
    signal(SIGWINCH, handle_sigwinch);

#ifdef HAVE_CONSOLECHARS
    if (console)
	if (va_system("consolechars -f matrix") != 0) {
	    c_die
		(" There was an error running consolechars. Please make sure the\n"
		 " consolechars program is in your $PATH.  Try running \"setfont matrix\" by hand.\n");
	}
#elif defined(HAVE_SETFONT)
    if (console)
	if (va_system("setfont matrix") != 0) {
	    c_die
		(" There was an error running setfont. Please make sure the\n"
		 " setfont program is in your $PATH.  Try running \"setfont matrix\" by hand.\n");
	}
#endif
    if (has_colors()) {
	start_color();
	/* Add in colors, if available */
#ifdef HAVE_USE_DEFAULT_COLORS
	if (use_default_colors() != ERR) {
	    init_pair(COLOR_BLACK, -1, -1);
	    init_pair(COLOR_GREEN, COLOR_GREEN, -1);
	    init_pair(COLOR_WHITE, COLOR_WHITE, -1);
	    init_pair(COLOR_RED, COLOR_RED, -1);
	    init_pair(COLOR_CYAN, COLOR_CYAN, -1);
	    init_pair(COLOR_MAGENTA, COLOR_MAGENTA, -1);
	    init_pair(COLOR_BLUE, COLOR_BLUE, -1);
	    init_pair(COLOR_YELLOW, COLOR_YELLOW, -1);
	} else {
#else
	{
#endif
	    init_pair(COLOR_BLACK, COLOR_BLACK, COLOR_BLACK);
	    init_pair(COLOR_GREEN, COLOR_GREEN, COLOR_BLACK);
	    init_pair(COLOR_WHITE, COLOR_WHITE, COLOR_BLACK);
	    init_pair(COLOR_RED, COLOR_RED, COLOR_BLACK);
	    init_pair(COLOR_CYAN, COLOR_CYAN, COLOR_BLACK);
	    init_pair(COLOR_MAGENTA, COLOR_MAGENTA, COLOR_BLACK);
	    init_pair(COLOR_BLUE, COLOR_BLUE, COLOR_BLACK);
	    init_pair(COLOR_YELLOW, COLOR_YELLOW, COLOR_BLACK);
	}
    }

    srand(time(NULL));

    /* Set up values for random number generation */
    if (console || xwindow) {
	randnum = 51;
	randmin = 166;
	highnum = 217;
    } else {
	randnum = 93;
	randmin = 33;
	highnum = 123;
    }

    var_init();

    while (1) {
	count++;
	if (count > 4)
	    count = 1;

	if ((keypress = wgetch(stdscr)) != ERR) {
	    if (screensaver == 1)
		finish(0);
	    else
		switch (keypress) {
		case 'q':
		    finish(0);
		    break;
		case 'a':
		    asynch = 1 - asynch;
		    break;
		case 'b':
		    bold = 1;
		    break;
		case 'B':
		    bold = 2;
		    break;
		case 'n':
		    bold = 0;
		    break;
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9':
		    update = keypress - 48;
		    break;
		case '!':
		    mcolor = COLOR_RED;
		    break;
		case '@':
		    mcolor = COLOR_GREEN;
		    break;
		case '#':
		    mcolor = COLOR_YELLOW;
		    break;
		case '$':
		    mcolor = COLOR_BLUE;
		    break;
		case '%':
		    mcolor = COLOR_MAGENTA;
		    break;
		case '^':
		    mcolor = COLOR_CYAN;
		    break;
		case '&':
		    mcolor = COLOR_WHITE;
		    break;
		}
	}
	sigprocmask(SIG_BLOCK, &sigs, NULL);
	for (j = 0; j <= COLS - 1; j += 2) {
	    if (count > updates[j] || asynch == 0) {

		/* I dont like old-style scrolling, yuck */
		if (oldstyle) {
		    for (i = LINES - 1; i >= 1; i--)
			matrix[i][j].val = matrix[i - 1][j].val;

		    random = (int) rand() % (randnum + 8) + randmin;

		    if (matrix[1][j].val == 0)
			matrix[0][j].val = 1;
		    else if (matrix[1][j].val == ' '
			     || matrix[1][j].val == -1) {
			if (spaces[j] > 0) {
			    matrix[0][j].val = ' ';
			    spaces[j]--;
			} else {

			    /* Random number to determine whether head of next collumn
			       of chars has a white 'head' on it. */

			    if (((int) rand() % 3) == 1)
				matrix[0][j].val = 0;
			    else
				matrix[0][j].val = (int) rand() % randnum
				    + randmin;

			    spaces[j] = (int) rand() % LINES + 1;
			}
		    } else if (random > highnum && matrix[1][j].val != 1)
			matrix[0][j].val = ' ';
		    else
			matrix[0][j].val =
			    (int) rand() % randnum + randmin;

		} else {	/* New style scrolling (default) */
		    if (matrix[0][j].val == -1 && matrix[1][j].val == ' '
			&& spaces[j] > 0) {
			matrix[0][j].val = -1;
			spaces[j]--;
		    }
			else if (matrix[0][j].val == -1
				 && matrix[1][j].val == ' ') {
			length[j] = (int) rand() % (LINES - 3) + 3;
			matrix[0][j].val =
			    (int) rand() % randnum + randmin;

			if ((int) rand() % 2 == 1)
			    matrix[0][j].bold = 2;

			spaces[j] = (int) rand() % LINES + 1;
		    }
		    i = 0;
		    y = 0;
		    firstcoldone = 0;
		    while (i <= LINES) {

			/* Skip over spaces */
			while (i <= LINES && (matrix[i][j].val == ' ' ||
			       matrix[i][j].val == -1))
			    i++;

			if (i > LINES)
			    break;

			/* Go to the head of this collumn */
			z = i;
			y = 0;
			while (i <= LINES && (matrix[i][j].val != ' ' &&
				matrix[i][j].val != -1)) {
			    i++;
			    y++;
			}

			if (i > LINES) {
			    matrix[z][j].val = ' ';
			    matrix[LINES][j].bold = 1;
			    continue;
			}

			matrix[i][j].val =
			    (int) rand() % randnum + randmin;

			if (matrix[i - 1][j].bold == 2) {
			    matrix[i - 1][j].bold = 1;
			    matrix[i][j].bold = 2;
			}

			/* If we're at the top of the collumn and it's reached its
			 * full length (about to start moving down), we do this
			 * to get it moving.  This is also how we keep segments not
			 * already growing from growing accidentally =>
			 */
			if (y > length[j] || firstcoldone) {
			    matrix[z][j].val = ' ';
			    matrix[0][j].val = -1;
			}
			firstcoldone = 1;
			i++;
		    }
		}
	    }
	    /* Hack =P */
	    if (!oldstyle) {
		y = 1;
		z = LINES;
	    } else {
		y = 0;
		z = LINES - 1;
	    }
	    for (i = y; i <= z; i++) {
		move(i - y, j);

		if (matrix[i][j].val == 0 || matrix[i][j].bold == 2) {
		    if (console || xwindow)
			attron(A_ALTCHARSET);
		    attron(COLOR_PAIR(COLOR_WHITE));
		    if (bold)
			attron(A_BOLD);
		    if (matrix[i][j].val == 0) {
			if (console || xwindow)
			    addch(183);
			else
			    addch('&');
		    } else
			addch(matrix[i][j].val);

		    attroff(COLOR_PAIR(COLOR_WHITE));
		    if (bold)
			attroff(A_BOLD);
		    if (console || xwindow)
			attroff(A_ALTCHARSET);
		} else {
		    attron(COLOR_PAIR(mcolor));
		    if (matrix[i][j].val == 1) {
			if (bold)
			    attron(A_BOLD);
			addch('|');
			if (bold)
			    attroff(A_BOLD);
		    } else {
			if (console || xwindow)
			    attron(A_ALTCHARSET);
			if (bold == 2 ||
			    (bold == 1 && matrix[i][j].val % 2 == 0))
			    attron(A_BOLD);
			if (matrix[i][j].val == -1)
			    addch(' ');
			else
			    addch(matrix[i][j].val);
			if (bold == 2 ||
			    (bold == 1 && matrix[i][j].val % 2 == 0))
			    attroff(A_BOLD);
			if (console || xwindow)
			    attroff(A_ALTCHARSET);
		    }
		    attroff(COLOR_PAIR(mcolor));
		}
	    }
	}
	refresh();
	sigprocmask(SIG_UNBLOCK, &sigs, NULL);
	napms(update * 10);

    }

    syscmd = nmalloc(sizeof (char *) * (strlen(oldtermname) + 15));
    sprintf(syscmd, "putenv TERM=%s", oldtermname);    
    system(syscmd);
    finish(0);

}