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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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //=========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour |
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34 // Date: 1998-02-13 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //=========================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Include the C library? |
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48 #ifdef CYGPKG_LIBC |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common type definitions |
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53 #include <cyg/infra/cyg_trac.h> // Tracing support |
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54 #include <cyg/infra/cyg_ass.h> // Assertion support |
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55 #include <string.h> // Header for this file |
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56 #include <stddef.h> // Compiler definitions such as size_t, NULL etc. |
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57 #include "clibincl/stringsupp.hxx" // Useful string function support and |
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58 // prototypes |
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59 |
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60 // EXPORTED SYMBOLS |
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61 |
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62 externC void * |
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63 memmove( void *s1, const void *s2, size_t n ) \ |
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64 CYGPRI_LIBC_WEAK_ALIAS("_memmove"); |
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65 |
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66 // FUNCTIONS |
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67 |
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68 void * |
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69 _memmove( void *s1, const void *s2, size_t n ) |
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70 { |
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71 char *dst = (char *)s1; |
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72 const char *src = (const char *)s2; |
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73 |
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74 CYG_REPORT_FUNCNAMETYPE( "_memmove", "returning %08x" ); |
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75 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); |
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76 |
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77 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); |
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78 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); |
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79 |
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80 if ((src < dst) && (dst < (src + n))) |
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81 { |
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82 // Have to copy backwards |
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83 src += n; |
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84 dst += n; |
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85 while (n--) |
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86 { |
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87 *--dst = *--src; |
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88 } |
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89 } |
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90 else |
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91 { |
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92 while (n--) |
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93 { |
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94 *dst++ = *src++; |
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95 } |
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96 } |
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97 |
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98 CYG_REPORT_RETVAL( s1 ); |
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99 |
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100 return s1; |
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101 } // _memmove() |
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102 |
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103 #endif // ifdef CYGPKG_LIBC |
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104 |
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105 // EOF memmove.cxx |
