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annotate packages/language/c/libc/current/src/string/memmove.cxx @ 66:bf00f99aec69 ecos-sw-2000-02-02

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Merge from eCos master repository on 2000-02-02-19:16:44-GMT
author jlarmour
date Wed, 02 Feb 2000 19:57:02 +0000
parents c38311975d4f
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1 //===========================================================================
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2 //
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3 // memmove.cxx
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4 //
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5 // ANSI standard memmove() routine
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6 //
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7 //===========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
0
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors: jlarmour
0
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36 // Date: 1998-02-13
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc.h> // Configuration header
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48
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49 // Include the C library?
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50 #ifdef CYGPKG_LIBC
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51
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52 // INCLUDES
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53
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54 #include <cyg/infra/cyg_type.h> // Common type definitions
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55 #include <cyg/infra/cyg_trac.h> // Tracing support
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56 #include <cyg/infra/cyg_ass.h> // Assertion support
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57 #include <string.h> // Header for this file
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58 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
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59 #include "clibincl/stringsupp.hxx" // Useful string function support and
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60 // prototypes
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61
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62 // EXPORTED SYMBOLS
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63
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64 externC void *
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65 memmove( void *s1, const void *s2, size_t n ) \
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66 CYGPRI_LIBC_WEAK_ALIAS("_memmove");
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67
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68 // FUNCTIONS
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69
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70 void *
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71 _memmove( void *s1, const void *s2, size_t n )
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72 {
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73 char *dst = (char *)s1;
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74 const char *src = (const char *)s2;
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75
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76 CYG_REPORT_FUNCNAMETYPE( "_memmove", "returning %08x" );
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77 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
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78
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79 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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80 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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81
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82 if ((src < dst) && (dst < (src + n)))
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83 {
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84 // Have to copy backwards
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85 src += n;
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86 dst += n;
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87 while (n--)
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88 {
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89 *--dst = *--src;
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90 }
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91 }
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92 else
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93 {
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94 while (n--)
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95 {
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96 *dst++ = *src++;
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97 }
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98 }
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99
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100 CYG_REPORT_RETVAL( s1 );
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101
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102 return s1;
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103 } // _memmove()
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104
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105 #endif // ifdef CYGPKG_LIBC
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106
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107 // EOF memmove.cxx