mirror of
https://git.busybox.net/uClibc
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266bdc1f62
This matches a similar change made to glibc. No functional changes here. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* Copyright (C) 1992, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _ALLOCA_H
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#define _ALLOCA_H 1
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#include <features.h>
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#define __need_size_t
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#include <stddef.h>
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__BEGIN_DECLS
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/* Remove any previous definitions. */
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#undef alloca
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/* Allocate a block that will be freed when the calling function exits. */
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extern void *alloca (size_t __size) __THROW;
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#ifdef __GNUC__
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# define alloca(size) __builtin_alloca (size)
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#endif /* GCC. */
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#ifdef _LIBC
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# define __MAX_ALLOCA_CUTOFF 65536
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# include <bits/stackinfo.h>
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# ifdef _STACK_GROWS_DOWN
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# define extend_alloca(buf, len, newlen) \
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(__typeof (buf)) ({ size_t __newlen = (newlen); \
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char *__newbuf = alloca (__newlen); \
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if (__newbuf + __newlen == (char *) buf) \
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len += __newlen; \
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else \
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len = __newlen; \
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__newbuf; })
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# elif defined _STACK_GROWS_UP
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# define extend_alloca(buf, len, newlen) \
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(__typeof (buf)) ({ size_t __newlen = (newlen); \
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char *__newbuf = alloca (__newlen); \
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char *__buf = (buf); \
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if (__buf + __newlen == __newbuf) \
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{ \
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len += __newlen; \
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__newbuf = __buf; \
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} \
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else \
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len = __newlen; \
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__newbuf; })
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# else
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# error unknown stack
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# define extend_alloca(buf, len, newlen) \
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alloca (((len) = (newlen)))
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# endif
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extern int __libc_alloca_cutoff (size_t size);
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#endif
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__END_DECLS
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#endif /* alloca.h */
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