/* permutation/init.c
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
 * 
 * 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 2 of the License, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <stdlib.h>
#include "gsl_errno.h"
#include "gsl_permutation.h"

gsl_permutation *gsl_permutation_alloc(const size_t n)
{
    gsl_permutation *p;

    if (n == 0) {
	GSL_ERROR_VAL("permutation length n must be positive integer",
		      GSL_EDOM, 0);
    }

    p = (gsl_permutation *) malloc(sizeof(gsl_permutation));

    if (p == 0) {
	GSL_ERROR_VAL("failed to allocate space for permutation struct",
		      GSL_ENOMEM, 0);
    }

    p->data = (size_t *) malloc(n * sizeof(size_t));

    if (p->data == 0) {
	free(p);		/* exception in constructor, avoid memory leak */

	GSL_ERROR_VAL("failed to allocate space for permutation data",
		      GSL_ENOMEM, 0);
    }

    p->size = n;

    return p;
}


void gsl_permutation_free(gsl_permutation * p)
{
    free(p->data);
    free(p);
}