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/string/fstrncpy.c
+++ b/watcom/trunk/clib/string/fstrncpy.c
@@ -0,0 +1,82 @@
+/****************************************************************************
+*
+*                            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:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
+*               DESCRIBE IT HERE!
+*
+****************************************************************************/
+
+
+#include "variety.h"
+#include <string.h>
+
+#ifdef M_I86
+
+extern char _WCFAR *fast_strncpy( char _WCFAR *, const char _WCFAR *, size_t );
+
+#pragma aux fast_strncpy = \
+        0x1e            /* push ds    */\
+        0x96            /* xchg si,ax */\
+        0x8e 0xd8       /* mov ds,ax  */\
+        0x57            /* push di */\
+        0xac            /* L1: lodsb */\
+        0xaa            /* stosb */\
+        0x84 0xc0       /* test al,al */\
+        0xe0 0xfa       /* loopne L1 */\
+        0x31 0xc0       /* xor ax,ax */\
+        0xd1 0xe9       /* shr cx,1 */\
+        0xf3 0xab       /* rep stosw */\
+        0x11 0xc9       /* adc cx,cx */\
+        0xf3 0xaa       /* rep stosb */\
+        0x58            /* pop ax */\
+        0x1f            /* pop ds */\
+        parm caller     [es di] [si ax] [cx]\
+        value           [es ax] \
+        modify exact    [ax cx si di];
+#endif
+
+_WCRTLINK char _WCFAR *_fstrncpy( char _WCFAR *dst, const char _WCFAR *src, size_t len )
+    {
+#ifdef M_I86
+        if( len ) {
+            return( fast_strncpy( dst, src, len ) );
+        }
+        return( dst );
+#else
+        char _WCFAR *ret;
+
+        ret = dst;
+        for(;len; --len ) {
+            if( *src == '\0' ) break;
+            *dst++ = *src++;
+        }
+        while( len != 0 ) {
+            *dst++ = '\0';      /* pad destination string with null chars */
+            --len;
+        }
+        return( ret );
+#endif
+    }