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/* Copyright (C) 1992, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _ALLOCA_H
#define _ALLOCA_H 1
#include <features.h>
#define __need_size_t
#include <stddef.h>
__BEGIN_DECLS
/* Remove any previous definitions. */
#undef alloca
/* Allocate a block that will be freed when the calling function exits. */
extern void *alloca (size_t __size) __THROW;
#ifdef __GNUC__
# define alloca(size) __builtin_alloca (size)
#endif /* GCC. */
#ifdef _LIBC
# define __MAX_ALLOCA_CUTOFF 65536
# include <bits/stackinfo.h>
# ifdef _STACK_GROWS_DOWN
# define extend_alloca(buf, len, newlen) \
(__typeof (buf)) ({ size_t __newlen = (newlen); \
char *__newbuf = alloca (__newlen); \
if (__newbuf + __newlen == (char *) buf) \
len += __newlen; \
else \
len = __newlen; \
__newbuf; })
# elif defined _STACK_GROWS_UP
# define extend_alloca(buf, len, newlen) \
(__typeof (buf)) ({ size_t __newlen = (newlen); \
char *__newbuf = alloca (__newlen); \
char *__buf = (buf); \
if (__buf + __newlen == __newbuf) \
{ \
len += __newlen; \
__newbuf = __buf; \
} \
else \
len = __newlen; \
__newbuf; })
# else
# error unknown stack
# define extend_alloca(buf, len, newlen) \
alloca (((len) = (newlen)))
# endif
#endif
__END_DECLS
#endif /* alloca.h */
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