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

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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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114:5ad2b71d525e 115:6ed91473a1cd
1 //===========================================================================
2 //
3 // memmove.cxx
4 //
5 // ANSI standard memmove() routine
6 //
7 //===========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //===========================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): jlarmour
35 // Contributors:
36 // Date: 2000-04-14
37 // Purpose:
38 // Description:
39 // Usage:
40 //
41 //####DESCRIPTIONEND####
42 //
43 //===========================================================================
44
45 // CONFIGURATION
46
47 #include <pkgconf/libc_string.h> // Configuration header
48
49 // INCLUDES
50
51 #include <cyg/infra/cyg_type.h> // Common type definitions
52 #include <cyg/infra/cyg_trac.h> // Tracing support
53 #include <cyg/infra/cyg_ass.h> // Assertion support
54 #include <string.h> // Header for this file
55 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
56 #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
57 // prototypes
58
59 // EXPORTED SYMBOLS
60
61 externC void *
62 memmove( void *s1, const void *s2, size_t n ) \
63 CYGBLD_ATTRIB_WEAK_ALIAS(__memmove);
64
65 // FUNCTIONS
66
67 void *
68 __memmove( void *s1, const void *s2, size_t n )
69 {
70 char *dst = (char *)s1;
71 const char *src = (const char *)s2;
72
73 CYG_REPORT_FUNCNAMETYPE( "__memmove", "returning %08x" );
74 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
75
76 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
77 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
78
79 if ((src < dst) && (dst < (src + n)))
80 {
81 // Have to copy backwards
82 src += n;
83 dst += n;
84 while (n--)
85 {
86 *--dst = *--src;
87 }
88 }
89 else
90 {
91 while (n--)
92 {
93 *dst++ = *src++;
94 }
95 }
96
97 CYG_REPORT_RETVAL( s1 );
98
99 return s1;
100 } // __memmove()
101
102 // EOF memmove.cxx