/* 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 */