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glibc  2.9
morecore.c
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00001 /* Copyright (C) 1991,92,93,94,95,97,2002,2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #ifndef       _MALLOC_INTERNAL
00020 #define       _MALLOC_INTERNAL
00021 #include <malloc.h>
00022 #endif
00023 
00024 #ifndef       __GNU_LIBRARY__
00025 #define       __sbrk sbrk
00026 #endif
00027 
00028 #ifdef __GNU_LIBRARY__
00029 /* It is best not to declare this and cast its result on foreign operating
00030    systems with potentially hostile include files.  */
00031 
00032 #include <stddef.h>
00033 #include <stdlib.h>
00034 extern __malloc_ptr_t __sbrk (ptrdiff_t increment) __THROW;
00035 libc_hidden_proto (__sbrk)
00036 #endif
00037 
00038 #ifndef NULL
00039 #define NULL 0
00040 #endif
00041 
00042 /* Allocate INCREMENT more bytes of data space,
00043    and return the start of data space, or NULL on errors.
00044    If INCREMENT is negative, shrink data space.  */
00045 __malloc_ptr_t
00046 __default_morecore (increment)
00047      __malloc_ptrdiff_t increment;
00048 {
00049   __malloc_ptr_t result = (__malloc_ptr_t) __sbrk (increment);
00050   if (result == (__malloc_ptr_t) -1)
00051     return NULL;
00052   return result;
00053 }
00054 libc_hidden_def (__default_morecore)