stdlib/alloca.h

   1 /* Copyright (C) 1992, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #ifndef _ALLOCA_H
  20 #define _ALLOCA_H       1
  21 #include <features.h>
  22
  23 #define __need_size_t
  24 #include <stddef.h>
  25
  26 __BEGIN_DECLS
  27
  28 /* Remove any previous definitions.  */
  29 #undef  __alloca
  30 #undef  alloca
  31
  32 /* Allocate a block that will be freed when the calling function exits.  */
  33 extern __ptr_t __alloca __P ((size_t __size));
  34 extern __ptr_t alloca __P ((size_t __size));
  35
  36 #ifdef  __GNUC__
  37 #define __alloca(size)  __builtin_alloca(size)
  38 #endif /* GCC.  */
  39
  40 #define alloca(size)    __alloca(size)
  41
  42 __END_DECLS
  43
  44 #endif /* alloca.h */