/* Safe automatic memory allocation with out of memory checking.

   Copyright (C) 2003, 2005, 2007, 2009-2015 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2003.

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#ifndef _XMALLOCA_H

#define _XMALLOCA_H

#include "malloca.h"

#include "xalloc.h"

#ifdef __cplusplus

extern "C" {

#endif

/* xmalloca(N) is a checking safe variant of alloca(N).  It allocates N bytes

   of memory allocated on the stack, that must be freed using freea() before

   the function returns.  Upon failure, it exits with an error message.  */

#if HAVE_ALLOCA

# define xmalloca(N) \

  ((N) < 4032 - sa_increment                                        \

   ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \

   : xmmalloca (N))

extern void * xmmalloca (size_t n);

#else

# define xmalloca(N) \

  xmalloc (N)

#endif

/* xnmalloca(N,S) is an overflow-safe variant of xmalloca (N * S).

   It allocates an array of N objects, each with S bytes of memory,

   on the stack.  S must be positive and N must be nonnegative.

   The array must be freed using freea() before the function returns.

   Upon failure, it exits with an error message.  */

#if HAVE_ALLOCA

/* Rely on xmalloca (SIZE_MAX) calling xalloc_die ().  */

# define xnmalloca(n, s) \

    xmalloca (xalloc_oversized ((n), (s)) ? (size_t) (-1) : (n) * (s))

#else

# define xnmalloca(n, s) \

    xnmalloc ((n), (s))

#endif

#ifdef __cplusplus

}

#endif

#endif /* _XMALLOCA_H */