+++ /dev/null
-/* -*- buffer-read-only: t -*- vi: set ro: */
-/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
-/* Safe automatic memory allocation.
- Copyright (C) 2003-2007 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, 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. */
-
-#ifndef _MALLOCA_H
-#define _MALLOCA_H
-
-#include <alloca.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-/* safe_alloca(N) is equivalent to alloca(N) when it is safe to call
- alloca(N); otherwise it returns NULL. It either returns N bytes of
- memory allocated on the stack, that lasts until the function returns,
- or NULL.
- Use of safe_alloca should be avoided:
- - inside arguments of function calls - undefined behaviour,
- - in inline functions - the allocation may actually last until the
- calling function returns.
-*/
-#if HAVE_ALLOCA
-/* The OS usually guarantees only one guard page at the bottom of the stack,
- and a page size can be as small as 4096 bytes. So we cannot safely
- allocate anything larger than 4096 bytes. Also care for the possibility
- of a few compiler-allocated temporary stack slots.
- This must be a macro, not an inline function. */
-# define safe_alloca(N) ((N) < 4032 ? alloca (N) : NULL)
-#else
-# define safe_alloca(N) ((void) (N), NULL)
-#endif
-
-/* malloca(N) is a 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 returns NULL. */
-#if HAVE_ALLOCA
-# define malloca(N) \
- ((N) < 4032 - sa_increment \
- ? (void *) ((char *) alloca ((N) + sa_increment) + sa_increment) \
- : mmalloca (N))
-#else
-# define malloca(N) \
- mmalloca (N)
-#endif
-extern void * mmalloca (size_t n);
-
-/* Free a block of memory allocated through malloca(). */
-#if HAVE_ALLOCA
-extern void freea (void *p);
-#else
-# define freea free
-#endif
-
-/* nmalloca(N,S) is an overflow-safe variant of malloca (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. */
-#if 1
-/* Cf. the definition of xalloc_oversized. */
-# define nmalloca(n, s) \
- ((n) > (size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) \
- ? NULL \
- : malloca ((n) * (s)))
-#else
-extern void * nmalloca (size_t n, size_t s);
-#endif
-
-
-#ifdef __cplusplus
-}
-#endif
-
-
-/* ------------------- Auxiliary, non-public definitions ------------------- */
-
-/* Determine the alignment of a type at compile time. */
-#if defined __GNUC__
-# define sa_alignof __alignof__
-#elif defined __cplusplus
- template <class type> struct sa_alignof_helper { char __slot1; type __slot2; };
-# define sa_alignof(type) offsetof (sa_alignof_helper<type>, __slot2)
-#elif defined __hpux
- /* Work around a HP-UX 10.20 cc bug with enums constants defined as offsetof
- values. */
-# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
-#elif defined _AIX
- /* Work around an AIX 3.2.5 xlc bug with enums constants defined as offsetof
- values. */
-# define sa_alignof(type) (sizeof (type) <= 4 ? 4 : 8)
-#else
-# define sa_alignof(type) offsetof (struct { char __slot1; type __slot2; }, __slot2)
-#endif
-
-enum
-{
-/* The desired alignment of memory allocations is the maximum alignment
- among all elementary types. */
- sa_alignment_long = sa_alignof (long),
- sa_alignment_double = sa_alignof (double),
-#if HAVE_LONG_LONG_INT
- sa_alignment_longlong = sa_alignof (long long),
-#endif
- sa_alignment_longdouble = sa_alignof (long double),
- sa_alignment_max = ((sa_alignment_long - 1) | (sa_alignment_double - 1)
-#if HAVE_LONG_LONG_INT
- | (sa_alignment_longlong - 1)
-#endif
- | (sa_alignment_longdouble - 1)
- ) + 1,
-/* The increment that guarantees room for a magic word must be >= sizeof (int)
- and a multiple of sa_alignment_max. */
- sa_increment = ((sizeof (int) + sa_alignment_max - 1) / sa_alignment_max) * sa_alignment_max
-};
-
-#endif /* _MALLOCA_H */
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