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/nmalloc.c
+++ b/watcom/trunk/clib/heap/nmalloc.c
@@ -0,0 +1,124 @@
+/****************************************************************************
+*
+*                            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:  Implementation of near malloc() and _nmalloc().
+*
+****************************************************************************/
+
+
+//#include "dll.h"        // needs to be first
+#include "variety.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include "extfunc.h"
+#include "heapacc.h"
+#include "heap.h"
+
+#if defined(_M_IX86)
+    #pragma aux (__outside_CLIB) __nmemneed;
+#endif
+
+mheapptr _WCNEAR __nheapbeg = NULL;
+
+struct miniheapblkp _WCNEAR *__MiniHeapRover = NULL;
+unsigned int   __LargestSizeB4MiniHeapRover = 0;
+
+
+
+#if defined(__SMALL_DATA__)
+
+_WCRTLINK void *malloc( size_t amount )
+{
+    return( _nmalloc( amount ) );
+}
+
+#endif
+
+
+_WCRTLINK void _WCNEAR *_nmalloc( size_t amt )
+{
+    unsigned        largest;
+    unsigned        size;
+    unsigned        ptr;
+    unsigned char   expanded;
+    mheapptr        miniheap_ptr;
+
+    if( (amt == 0) || (amt > -sizeof(struct heapblk)) ) {
+        return( (void _WCNEAR *)NULL );
+    }
+
+    // Try to determine which miniheap to begin allocating from.
+    // first, round up the amount
+    size = (amt + TAG_SIZE + ROUND_SIZE) & ~ROUND_SIZE;
+    if( size < FRL_SIZE ) {
+        size = FRL_SIZE;
+    }
+
+    _AccessNHeap();
+    ptr = NULL;
+    expanded = 0;
+    for(;;) {
+        if( size > __LargestSizeB4MiniHeapRover ) {
+            miniheap_ptr = __MiniHeapRover;
+            if( miniheap_ptr == NULL ) {
+                __LargestSizeB4MiniHeapRover = 0;
+                miniheap_ptr = __nheapbeg;
+            }
+        } else {
+            __LargestSizeB4MiniHeapRover = 0;   // force value to be updated
+            miniheap_ptr = __nheapbeg;
+        }
+        for(;;) {
+            if( miniheap_ptr == NULL ) {
+                break;
+            }
+            __MiniHeapRover = miniheap_ptr;
+            largest = miniheap_ptr->largest_blk;
+            if( largest >= amt ) {
+                ptr = __MemAllocator( amt, _DGroup(), (unsigned)miniheap_ptr );
+                if( ptr != NULL ) {
+                    goto lbl_release_heap;
+                }
+            }
+            if( largest > __LargestSizeB4MiniHeapRover ) {
+                __LargestSizeB4MiniHeapRover = largest;
+            }
+            miniheap_ptr = miniheap_ptr->next;
+        }
+        if( expanded || !__ExpandDGROUP( amt ) ) {
+            if( !__nmemneed( amt ) ) {
+                break;
+            }
+            expanded = 0;
+        } else {
+            expanded = 1;
+        }
+    }
+lbl_release_heap:
+    _ReleaseNHeap();
+    return( (void _WCNEAR *)ptr );
+}