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annotate packages/language/c/libc/string/current/src/strncpy.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
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children 4c750ce71ae3
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115
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1 //===========================================================================
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2 //
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3 // strncpy.cxx
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4 //
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5 // ISO C standard strncpy() 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 //
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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:
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36 // Date: 2000-04-14
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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_string.h> // Configuration header
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48
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49 // INCLUDES
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50
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51 #include <cyg/infra/cyg_type.h> // Common type definitions
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52 #include <cyg/infra/cyg_trac.h> // Tracing support
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53 #include <cyg/infra/cyg_ass.h> // Assertion support
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54 #include <string.h> // Header for this file
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55 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
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56 #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
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57 // prototypes
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58
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59 // EXPORTED SYMBOLS
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60
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61 externC char *
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62 strncpy( char *s1, const char *s2, size_t n ) \
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63 CYGBLD_ATTRIB_WEAK_ALIAS(__strncpy);
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64
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65 // FUNCTIONS
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66
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67 char *
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68 __strncpy( char *s1, const char *s2, size_t n)
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69 {
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70 CYG_REPORT_FUNCNAMETYPE( "__strncpy", "returning %08x" );
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71 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
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72
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73 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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74 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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75
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76 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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77 char *dscan;
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78 const char *sscan;
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79
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80 dscan = s1;
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81 sscan = s2;
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82 while (n > 0)
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83 {
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84 --n;
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85 if ((*dscan++ = *sscan++) == '\0')
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86 break;
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87 }
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88 while (n-- > 0)
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89 *dscan++ = '\0';
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90
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91 CYG_REPORT_RETVAL( s1 );
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92
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93 return s1;
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94 #else
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95 char *dst = s1;
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96 const char *src = s2;
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97 CYG_WORD *aligned_dst;
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98 const CYG_WORD *aligned_src;
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99
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100 // If SRC and DEST is aligned and count large enough, then copy words.
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101 if (!CYG_LIBC_STR_UNALIGNED2 (src, dst) &&
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102 !CYG_LIBC_STR_OPT_TOO_SMALL (n)) {
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103
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104 aligned_dst = (CYG_WORD *)dst;
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105 aligned_src = (CYG_WORD *)src;
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106
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107 // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD"
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108 // sized copies.
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109 while (n >= sizeof (CYG_WORD) &&
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110 !CYG_LIBC_STR_DETECTNULL(*aligned_src)) {
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111
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112 n -= sizeof (CYG_WORD);
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113 *aligned_dst++ = *aligned_src++;
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114 }
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115
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116 dst = (char *)aligned_dst;
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117 src = (const char *)aligned_src;
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118 } // if
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119
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120 while (n > 0)
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121 {
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122 --n;
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123 if ((*dst++ = *src++) == '\0')
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124 break;
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125 }
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126
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127 while (n-- > 0)
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128 *dst++ = '\0';
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129
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130 CYG_REPORT_RETVAL( s1 );
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131
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132 return s1;
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133 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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134 // defined(__OPTIMIZE_SIZE__)
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135 } // __strncpy()
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136
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137 // EOF strncpy.cxx