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/* handles the handing out of and uniqueness of window numbers.
* Copyright (C) 2000, 2001 Shawn Betts
*
* This file is part of ratpoison.
*
* ratpoison 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 2, or (at your option)
* any later version.
*
* ratpoison 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 software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
#include <stdlib.h>
#include <stdio.h>
#include "ratpoison.h"
/* A list of the numbers taken. */
static int *numbers_taken;
/* the number of numbers currently stored in the numbers_taken
array. */
static int num_taken;
/* the size of the numbers_taken array. */
static int max_taken;
static int
number_is_taken (int n)
{
int i;
for (i=0; i<num_taken; i++)
{
if (numbers_taken[i] == n) return 1;
}
return 0;
}
/* returns index into numbers_taken that can be used. */
static int
find_empty_cell ()
{
int i;
for (i=0; i<num_taken; i++)
{
if (numbers_taken[i] == -1) return i;
}
/* no vacant ones, so grow the array. */
if (num_taken >= max_taken)
{
max_taken *= 2;
numbers_taken = realloc (numbers_taken, sizeof (int) * max_taken);
if (numbers_taken == NULL)
{
PRINT_ERROR ("Out of memory\n");
exit (EXIT_FAILURE);
}
}
num_taken++;
return num_taken-1;
}
static int
add_to_list (int n)
{
if (number_is_taken (n)) return 0; /* failed. */
numbers_taken[find_empty_cell()] = n;
return 1; /* success! */
}
/* returns a unique number that can be used as the window number in
the program bar. */
int
get_unique_window_number ()
{
int i;
/* look for a unique number, and add it to the list of taken
numbers. */
i = 0;
while (!add_to_list (i)) i++;
return i;
}
/* When a window is destroyed, it gives back its window number with
this function. */
void
return_window_number (int n)
{
int i;
for (i=0; i<num_taken; i++)
{
if (numbers_taken[i] == n)
{
numbers_taken[i] = -1;
return;
}
}
}
void
init_numbers ()
{
max_taken = 10;
num_taken = 0;
numbers_taken = malloc (max_taken * sizeof (int));
if (numbers_taken == NULL)
{
PRINT_ERROR ("Cannot allocate memory for numbers_taken.\n");
exit (EXIT_FAILURE);
}
}
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