Clib string & memory functions

git-svn-id: svn://kolibrios.org@553 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-06-26 00:54:22 +00:00
parent d5f66e011c
commit 836c97f0ac
162 changed files with 11855 additions and 0 deletions
--- a/watcom/trunk/clib/heap/nrealloc.c
+++ b/watcom/trunk/clib/heap/nrealloc.c
@@ -0,0 +1,88 @@
+/****************************************************************************
+*
+*                            Open Watcom Project
+*
+*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
+*
+*  ========================================================================
+*
+*    This file contains Original Code and/or Modifications of Original
+*    Code as defined in and that are subject to the Sybase Open Watcom
+*    Public License version 1.0 (the 'License'). You may not use this file
+*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
+*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
+*    provided with the Original Code and Modifications, and is also
+*    available at www.sybase.com/developer/opensource.
+*
+*    The Original Code and all software distributed under the License are
+*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
+*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
+*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
+*    NON-INFRINGEMENT. Please see the License for the specific language
+*    governing rights and limitations under the License.
+*
+*  ========================================================================
+*
+* Description:  Near heap realloc routines.
+*
+****************************************************************************/
+
+
+//#include "dll.h"        // needs to be first
+#include "variety.h"
+#include <stddef.h>
+#include <malloc.h>
+#include <string.h>
+#include "heap.h"
+#if defined(__DOS_EXT__)
+ #include "extender.h"
+#endif
+
+#if defined(__SMALL_DATA__)
+
+_WCRTLINK void *realloc( void *stg, size_t amount )
+    {
+        return( _nrealloc( stg, amount ) );
+    }
+
+#endif
+
+#pragma intrinsic(memcpy)
+
+_WCRTLINK void _WCNEAR *_nrealloc( void _WCI86NEAR *stg, size_t req_size )
+    {
+        void _WCNEAR *p;
+        size_t     old_size;
+
+        if( stg == NULL ) {
+            return( _nmalloc( req_size ) );
+        }
+        if( req_size == 0 ) {
+            _nfree( stg );
+            return( (void _WCNEAR *) NULL );
+        }
+        old_size = _nmsize( stg );
+        p = _nexpand( stg, req_size );  /* try to expand it in place */
+        if( p == NULL ) {               /* if couldn't be expanded in place */
+            #if defined(__DOS_EXT__)
+            if( _IsRational() ) {
+                frlptr  flp, newflp;
+
+                flp = (frlptr) ((PTR)stg - TAG_SIZE);
+                newflp = __ReAllocDPMIBlock( flp, req_size + TAG_SIZE );
+                if( newflp ) {
+                    return( (void _WCNEAR *)((PTR)newflp + TAG_SIZE) );
+                }
+            }
+            #endif
+            p = _nmalloc( req_size );   /* - allocate a new block */
+            if( p != NULL ) {           /* - if we got one */
+                memcpy( p, stg, old_size );  /* copy it */
+                _nfree( stg );                  /* and free old one */
+            } else {
+                _nexpand( stg, old_size );      /* reset back to old size */
+            }
+        }
+        return( p );
+    }