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/* handles the handing out of and uniqueness of window numbers.
* Copyright (C) 2000, 2001, 2002, 2003, 2004 Shawn Betts <sabetts@vcn.bc.ca>
*
* 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"
/* Keep track of a set of numbers. For frames and windows. */
struct numset
{
/* A list of the numbers taken. */
int *numbers_taken;
/* the number of numbers currently stored in the numbers_taken
array. */
int num_taken;
/* the size of the numbers_taken array. */
int max_taken;
};
/* Initialize a numset structure. */
static void
numset_init (struct numset *ns)
{
ns->max_taken = 10;
ns->num_taken = 0;
ns->numbers_taken = xmalloc (ns->max_taken * sizeof (int));
}
static int
numset_num_is_taken (struct numset *ns, int n)
{
int i;
for (i=0; i<ns->num_taken; i++)
{
if (ns->numbers_taken[i] == n) return 1;
}
return 0;
}
/* returns index into numbers_taken that can be used. */
static int
numset_find_empty_cell (struct numset *ns)
{
int i;
for (i=0; i<ns->num_taken; i++)
{
if (ns->numbers_taken[i] == -1) return i;
}
/* no vacant ones, so grow the array. */
if (ns->num_taken >= ns->max_taken)
{
ns->max_taken *= 2;
ns->numbers_taken = xrealloc (ns->numbers_taken, sizeof (int) * ns->max_taken);
}
ns->num_taken++;
return ns->num_taken-1;
}
int
numset_add_num (struct numset *ns, int n)
{
int ec;
PRINT_DEBUG(("ns=%p add_num %d\n", ns, n));
if (numset_num_is_taken (ns, n))
return 0; /* failed. */
/* numset_find_empty_cell calls realloc on numbers_taken. So store
the ret val in ec then use ec as an index into the array. */
ec = numset_find_empty_cell(ns);
ns->numbers_taken[ec] = n;
return 1; /* success! */
}
/* returns a unique number that can be used as the window number in
the program bar. */
int
numset_request (struct numset *ns)
{
int i;
/* look for a unique number, and add it to the list of taken
numbers. */
i = 0;
while (!numset_add_num (ns, i)) i++;
PRINT_DEBUG(("ns=%p request got %d\n", ns, i));
return i;
}
/* When a window is destroyed, it gives back its window number with
this function. */
void
numset_release (struct numset *ns, int n)
{
int i;
PRINT_DEBUG(("ns=%p release %d\n", ns, n));
if (n < 0)
PRINT_ERROR(("ns=%p Attempt to release %d!\n", ns, n));
for (i=0; i<ns->num_taken; i++)
{
if (ns->numbers_taken[i] == n)
{
ns->numbers_taken[i] = -1;
return;
}
}
}
/* Create a new numset and return a pointer to it. */
struct numset *
numset_new (void)
{
struct numset *ns;
ns = xmalloc (sizeof (struct numset));
numset_init (ns);
return ns;
}
/* Free a numset structure and it's internal data. */
void
numset_free (struct numset *ns)
{
free (ns->numbers_taken);
free (ns);
}
void
numset_clear (struct numset *ns)
{
ns->num_taken = 0;
}
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