void
maze_gen(short int *grid, int TotalCells) {
int CurrentCell = random() / (RAND_MAX / TotalCells + 1);
int VisitedCells = 1;
int AdCell; /* Adiacent cell */
int *stack, top = 0;
int i;
if(! (stack = malloc(sizeof(int) * TotalCells)))
return;
for(i = 0; i < rows * cols; i++)
grid[i] = A << WALLS;
while(VisitedCells < TotalCells) {
if((AdCell = nextcell(grid, CurrentCell)) != -1) {
pulldown(grid, CurrentCell, AdCell);
push(stack, &top, CurrentCell);
CurrentCell = AdCell;
++VisitedCells;
}
else
CurrentCell = pop(stack, &top);
}
}
static void execute(void)
{
context.pos.x = context.pos.y = context.stack.pos = context.stringmode = 0;
context.direction = RIGHT;
memset(context.stack.stck, 0, sizeof(context.stack));
while(process() != EOP)
nextcell();
}
static int process(void)
{
int val1, val2;
if(context.stringmode)
{
if(matrix[context.pos.y][context.pos.x] == '"')
context.stringmode = 0;
else
push(matrix[context.pos.y][context.pos.x]);
return 0;
}
if(matrix[context.pos.y][context.pos.x] == ' ')
return 0;
switch(matrix[context.pos.y][context.pos.x])
{
/* @ (end) ends program */
case '@':
return EOP;
case '>': case '<': case '^': case 'v':
context.direction = car2dir(matrix[context.pos.y][context.pos.x]);
break;
/* _ (horizontal if) <boolean value> PC->left if <value>, else PC->right */
case '_':
context.direction = (pop() ? LEFT : RIGHT);
break;
/* | (vertical if) <boolean value> PC->up if <value>, else PC->down */
case '|':
context.direction = (pop() ? UP : DOWN);
break;
/* : (dup) <value> <value> <value> */
case ':':
push(val1 = pop());
push(val1);
break;
/* ? (random) PC -> right? left? up? down? ??? */
case '?':
context.direction = rand() % DIRMAX;
break;
case '+': case '-': case '*': case '/': case '%':
val1 = pop(), val2 = pop();
push(binaryfuncs[binaryopcar2index(matrix[context.pos.y][context.pos.x])](val2, val1));
break;
case '!':
push(!pop());
break;
/* ` (greater) <value1> <value2> <1 if value1 > value2, 0 otherwise> */
case '`':
push(pop() < pop());
break;
/* \ (swap) <value1> <value2> <value2> <value1> */
case '\\':
val1 = pop(), val2 = pop();
push(val1);
push(val2);
break;
/* $ (pop) <value> pops <value> but does nothing */
case '$':
(void) pop();
break;
/* . (pop) <value> outputs <value> as integer */
case '.':
printf("%d", pop());
break;
/* , (pop) <value> outputs <value> as ASCII */
case ',':
putchar(pop());
break;
/* # (bridge) 'jumps' PC one farther; skips over next command */
case '#':
nextcell();
break;
/* ~ (input character) <character user entered> */
case '~':
push(xgetchar());
break;
case '"':
context.stringmode = !context.stringmode;
break;
/* & (input value) <value user entered> */
case '&':
push(getint());
break;
case 'p':
val1 = pop(), val2 = pop();
matrix[val1][val2] = pop();
break;
case 'g':
val1 = pop(), val2 = pop();
push(matrix[val1][val2]);
break;
default:
if(isdigit(matrix[context.pos.y][context.pos.x]))
push(matrix[context.pos.y][context.pos.x] - '0');
}
return 0;
}