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life.c
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life.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <libgen.h>
static const useconds_t default_sleep_update_us = 1e5; /* micro-seconds */
static const double default_rand_live_prob = 0.5;
static const unsigned long default_iterations = -1; /* update, and update... */
static const int default_visible_y = 60;
static const int default_visible_x = 140;
static const char default_live_cell = '*';
static const char default_dead_cell = ' ';
static useconds_t sleep_update_us;
static double rand_live_prob;
static unsigned long iterations;
static int visible_y;
static int visible_x;
static char live_cell;
static char dead_cell;
/**
* currently global full grid size (but shouldn't be global, really)
*/
static int grid_y;
static int grid_x;
/**
* who I am
*/
static char *progname;
/**
* colorize cells
*/
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_GREEN "\x1b[32m"
#define ANSI_COLOR_YELLOW "\x1b[33m"
#define ANSI_COLOR_BLUE "\x1b[34m"
#define ANSI_COLOR_MAGENTA "\x1b[35m"
#define ANSI_COLOR_CYAN "\x1b[36m"
#define ANSI_COLOR_RESET "\x1b[0m"
/**
* allocate memory for an entire grid
*/
static
int **
allocate_grid (void)
{
int y;
int **g = (int **) malloc (sizeof (*g) * grid_y);
for (y = 0; y < grid_y; y += 1) {
g[y] = (int *) malloc (sizeof (**g) * grid_x);
}
return g;
}
/**
* initialize a grid to completely dead
*/
static
void
zero_full_grid (int **g)
{
int y;
for (y = 0; y < grid_y; y += 1) {
int x;
for (x = 0; x < grid_x; x += 1) {
g[y][x] = 0;
}
}
}
/**
* randomly (and fairly sparsely) populate a grid
*/
static
void
randomize_visible_grid (int **g)
{
int y;
const int p = rand_live_prob * 1000;
srand (time (NULL) + getpid ());
for (y = 1; y < grid_y - 1; y += 1) {
int x;
for (x = 1; x < grid_x - 1; x += 1) {
g[y][x] = (rand () % 1000) > p ? 1 : 0;
}
}
}
/**
* read in a grid population from a file. Format
*
* Y X
*
* to make alive, one pair per line
*/
static
void
load_visible_grid (const char *filename, int **g)
{
FILE *fp = fopen (filename, "r"); /* unchecked */
char buf[64];
while (fgets (buf, sizeof (buf) - 1, fp) != NULL) {
int y, x;
sscanf (buf, "%d %d", &y, &x);
fprintf (stderr, "Loaded y = %d, x = %d\n", y, x);
g[y][x] = 1;
}
fclose (fp);
}
static
inline
void
update_visible_grid (int **old, int **new_g)
{
int y;
#pragma omp parallel for
for (y = 1; y < grid_y - 1; y += 1) {
int x;
for (x = 1; x < grid_x - 1; x += 1) {
/* add up neighbors from above, self, and below */
const int prn = old[y-1][x-1] + old[y-1][x] + old[y-1][x+1];
const int srn = old[y ][x-1] + old[y ][x+1];
const int nrn = old[y+1][x-1] + old[y+1][x] + old[y+1][x+1];
const int n = prn + srn + nrn;
if (old[y][x]) { /* currently alive, 2-3 neighbors stay alive */
new_g[y][x] = ((n == 2) || (n == 3)) ? 1 : 0;
}
else { /* currently dead, 3 neighbors come alive */
new_g[y][x] = (n == 3) ? 1 : 0;
}
}
}
}
static const char *live_color = ANSI_COLOR_YELLOW;
static const char *dead_color = ANSI_COLOR_BLUE;
static
inline
void
show_full_grid (int **g)
{
int y;
for (y = 0; y < grid_y; y += 1) {
int x;
for (x = 0; x < grid_x; x += 1) {
if (g[y][x]) {
printf ("%s%c" ANSI_COLOR_RESET, live_color, live_cell);
}
else {
printf("%s%c" ANSI_COLOR_RESET, dead_color, dead_cell);
}
}
printf ("\n");
}
printf ("\n");
}
static
inline
void
swap_grids (int ***from, int ***to)
{
int **swap = *from;
*from = *to;
*to = swap;
}
static
void
help_message (int opt)
{
fprintf (stderr,
"Usage: %s [options]\n",
progname);
fprintf (stderr, "\n");
fprintf (stderr,
" -s micro-seconds sleep between updates (default %d)\n",
default_sleep_update_us);
fprintf (stderr,
" -r threshold probability of initial live cell (default %.1f)\n",
default_rand_live_prob);
fprintf (stderr,
" -n iterations update how many times (default forever)\n");
fprintf (stderr,
" -h this help message\n");
fprintf (stderr,
" -y y_size height of grid (default %d)\n",
default_visible_y);
fprintf (stderr,
" -x x_size width of grid (default %d)\n",
default_visible_x);
fprintf (stderr,
" -a alive-char alive cells show this (default '%c')\n",
default_live_cell);
fprintf (stderr,
" -d dead-char dead cells show this (default '%c')\n",
default_dead_cell);
fprintf (stderr, "\n");
}
int
main (int argc, char *argv[])
{
int opt;
unsigned long iter;
int **old_grid;
int **new_grid; /* current and new grid generation */
int **from;
int **to; /* double-buffer */
progname = basename (argv[0]);
sleep_update_us = default_sleep_update_us;
rand_live_prob = default_rand_live_prob;
iterations = default_iterations;
visible_y = default_visible_y;
visible_x = default_visible_x;
live_cell = default_live_cell;
dead_cell = default_dead_cell;
while ((opt = getopt (argc, argv, "s:r:n:y:x:ha:d:")) != -1) {
switch (opt) {
case 's':
sleep_update_us = atoi (optarg);
break;
case 'r':
rand_live_prob = atof (optarg);
break;
case 'n':
iterations = atoi (optarg);
break;
case 'y':
visible_y = atoi (optarg);
break;
case 'x':
visible_x = atoi (optarg);
break;
case 'a':
live_cell = *optarg;
break;
case 'd':
dead_cell = *optarg;
break;
default: /* '?' */
help_message (opt);
exit (EXIT_FAILURE);
break;
}
}
/**
* full grid has a dead border
*/
grid_y = 1 + visible_y + 1;
grid_x = 1 + visible_x + 1;
old_grid = allocate_grid();
new_grid = allocate_grid();
from = old_grid;
to = new_grid;
zero_full_grid (from);
/**
* allow user to choose how to initialize in future
*/
randomize_visible_grid (from);
#if 0
beacon_grid (from);
load_visible_grid ("glider.life", from);
#endif
for (iter = 0; iter != iterations; iter += 1) {
system ("clear"); /* should we use curses or similar here? */
show_full_grid (from);
usleep (sleep_update_us);
update_visible_grid (from, to);
swap_grids (&from, &to);
}
return 0;
}