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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, see
- <http://www.gnu.org/licenses/>. */
- #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
- extern int __libc_alloca_cutoff (size_t size);
- #endif
- __END_DECLS
- #endif /* alloca.h */
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