diff packages/language/c/libc/string/current/src/memmove.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents
children 4c750ce71ae3
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+//===========================================================================
+//
+//      memmove.cxx
+//
+//      ANSI standard memmove() routine
+//
+//===========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//===========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):     jlarmour
+// Contributors:  
+// Date:          2000-04-14
+// Purpose:     
+// Description: 
+// Usage:       
+//
+//####DESCRIPTIONEND####
+//
+//===========================================================================
+
+// CONFIGURATION
+
+#include <pkgconf/libc_string.h>   // Configuration header
+
+// INCLUDES
+
+#include <cyg/infra/cyg_type.h>    // Common type definitions
+#include <cyg/infra/cyg_trac.h>    // Tracing support
+#include <cyg/infra/cyg_ass.h>     // Assertion support
+#include <string.h>                // Header for this file
+#include <stddef.h>         // Compiler definitions such as size_t, NULL etc.
+#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
+                                          // prototypes
+
+// EXPORTED SYMBOLS
+
+externC void *
+memmove( void *s1, const void *s2, size_t n ) \
+    CYGBLD_ATTRIB_WEAK_ALIAS(__memmove);
+
+// FUNCTIONS
+
+void *
+__memmove( void *s1, const void *s2, size_t n )
+{
+    char *dst = (char *)s1;
+    const char *src = (const char *)s2;
+    
+    CYG_REPORT_FUNCNAMETYPE( "__memmove", "returning %08x" );
+    CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
+
+    CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
+    CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
+
+    if ((src < dst) && (dst < (src + n)))
+    {
+        // Have to copy backwards
+        src += n;
+        dst += n;
+        while (n--)
+        {
+            *--dst = *--src;
+        }
+    }
+    else
+    {
+        while (n--)
+        {
+            *dst++ = *src++;
+        }
+    }
+
+    CYG_REPORT_RETVAL( s1 );
+    
+    return s1;
+} // __memmove()
+
+// EOF memmove.cxx