1: /* Copyright (C) 1991,92,93,94,95,97,2002,2004 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 Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the 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:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #ifndef _MALLOC_INTERNAL
   20: #define _MALLOC_INTERNAL
   21: #include <malloc.h>
   22: #endif
   23: 
   24: #ifndef __GNU_LIBRARY__
   25: #define __sbrk  sbrk
   26: #endif
   27: 
   28: #ifdef __GNU_LIBRARY__
   29: /* It is best not to declare this and cast its result on foreign operating
   30:    systems with potentially hostile include files.  */
   31: 
   32: #include <stddef.h>
   33: #include <stdlib.h>
   34: extern __malloc_ptr_t __sbrk (ptrdiff_t increment) __THROW;
   35: libc_hidden_proto (__sbrk)
   36: #endif
   37: 
   38: #ifndef NULL
   39: #define NULL 0
   40: #endif
   41: 
   42: /* Allocate INCREMENT more bytes of data space,
   43:    and return the start of data space, or NULL on errors.
   44:    If INCREMENT is negative, shrink data space.  */
   45: __malloc_ptr_t
   46: __default_morecore (increment)
   47:      __malloc_ptrdiff_t increment;
   48: {
   49:   __malloc_ptr_t result = (__malloc_ptr_t) __sbrk (increment);
   50:   if (result == (__malloc_ptr_t) -1)
   51:     return NULL;
   52:   return result;
   53: }
   54: libc_hidden_def (__default_morecore)