source: SVN/cambria/redboot/packages/language/c/libc/string/current/src/memmove.cxx @ 1

Last change on this file since 1 was 1, checked in by Tim Harvey, 2 years ago

restored latest version of files from server backup

Signed-off-by: Tim Harvey <tharvey@…>

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Line 
1//===========================================================================
2//
3//      memmove.cxx
4//
5//      ANSI standard memmove() routine
6//
7//===========================================================================
8//####ECOSGPLCOPYRIGHTBEGIN####
9// -------------------------------------------
10// This file is part of eCos, the Embedded Configurable Operating System.
11// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
12//
13// eCos is free software; you can redistribute it and/or modify it under
14// the terms of the GNU General Public License as published by the Free
15// Software Foundation; either version 2 or (at your option) any later version.
16//
17// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
18// WARRANTY; without even the implied warranty of MERCHANTABILITY or
19// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
20// for more details.
21//
22// You should have received a copy of the GNU General Public License along
23// with eCos; if not, write to the Free Software Foundation, Inc.,
24// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25//
26// As a special exception, if other files instantiate templates or use macros
27// or inline functions from this file, or you compile this file and link it
28// with other works to produce a work based on this file, this file does not
29// by itself cause the resulting work to be covered by the GNU General Public
30// License. However the source code for this file must still be made available
31// in accordance with section (3) of the GNU General Public License.
32//
33// This exception does not invalidate any other reasons why a work based on
34// this file might be covered by the GNU General Public License.
35//
36// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
37// at http://sources.redhat.com/ecos/ecos-license/
38// -------------------------------------------
39//####ECOSGPLCOPYRIGHTEND####
40//===========================================================================
41//#####DESCRIPTIONBEGIN####
42//
43// Author(s):     jlarmour
44// Contributors: 
45// Date:          2000-04-14
46// Purpose:     
47// Description:
48// Usage:       
49//
50//####DESCRIPTIONEND####
51//
52//===========================================================================
53
54// CONFIGURATION
55
56#include <pkgconf/libc_string.h>   // Configuration header
57
58// INCLUDES
59
60#include <cyg/infra/cyg_type.h>    // Common type definitions
61#include <cyg/infra/cyg_trac.h>    // Tracing support
62#include <cyg/infra/cyg_ass.h>     // Assertion support
63#include <string.h>                // Header for this file
64#include <stddef.h>         // Compiler definitions such as size_t, NULL etc.
65#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
66                                          // prototypes
67
68// EXPORTED SYMBOLS
69
70externC void *
71memmove( void *s1, const void *s2, size_t n ) \
72    CYGBLD_ATTRIB_WEAK_ALIAS(__memmove);
73
74// FUNCTIONS
75
76void *
77__memmove( void *s1, const void *s2, size_t n )
78{
79    char *dst = (char *)s1;
80    const char *src = (const char *)s2;
81   
82    CYG_REPORT_FUNCNAMETYPE( "__memmove", "returning %08x" );
83    CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
84
85    if (n)
86    {
87        CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
88        CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
89    }
90
91    if ((src < dst) && (dst < (src + n)))
92    {
93        // Have to copy backwards
94        src += n;
95        dst += n;
96        while (n--)
97        {
98            *--dst = *--src;
99        }
100    }
101    else
102    {
103        while (n--)
104        {
105            *dst++ = *src++;
106        }
107    }
108
109    CYG_REPORT_RETVAL( s1 );
110   
111    return s1;
112} // __memmove()
113
114// EOF memmove.cxx
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