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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 // ANSI 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 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 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@cygnus.co.uk |
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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 char * |
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63 strncpy( char *s1, const char *s2, size_t n ) \ |
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64 CYGPRI_LIBC_WEAK_ALIAS("_strncpy"); |
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65 |
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66 // FUNCTIONS |
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67 |
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68 char * |
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69 _strncpy( char *s1, const char *s2, size_t n) |
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70 { |
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71 CYG_REPORT_FUNCNAMETYPE( "_strncpy", "returning %08x" ); |
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72 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); |
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73 |
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74 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); |
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75 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); |
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76 |
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77 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) |
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78 char *dscan; |
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79 const char *sscan; |
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80 |
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81 dscan = s1; |
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82 sscan = s2; |
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83 while (n > 0) |
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84 { |
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85 --n; |
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86 if ((*dscan++ = *sscan++) == '\0') |
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87 break; |
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88 } |
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89 while (n-- > 0) |
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90 *dscan++ = '\0'; |
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91 |
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92 CYG_REPORT_RETVAL( s1 ); |
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93 |
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94 return s1; |
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95 #else |
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96 char *dst = s1; |
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97 const char *src = s2; |
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98 CYG_WORD *aligned_dst; |
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99 const CYG_WORD *aligned_src; |
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100 |
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101 // If SRC or DEST is unaligned, then copy bytes. |
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102 if (CYG_LIBC_STR_OPT_TOO_SMALL (n) || CYG_LIBC_STR_UNALIGNED2 (src, dst)) |
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103 { |
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104 while (n > 0) |
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105 { |
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106 --n; |
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107 if ((*dst++ = *src++) == '\0') |
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108 break; |
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109 } |
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110 |
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111 while (n -- > 0) |
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112 *dst++ = '\0'; |
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113 |
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114 CYG_REPORT_RETVAL( s1 ); |
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115 |
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116 return s1; |
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117 } |
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118 |
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119 aligned_dst = (CYG_WORD *)dst; |
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120 aligned_src = (const CYG_WORD *)src; |
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121 |
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122 // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD" |
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123 // sized copies. |
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124 while (n >= sizeof (CYG_WORD) && !CYG_LIBC_STR_DETECTNULL(*aligned_src)) |
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125 { |
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126 n -= sizeof (CYG_WORD); |
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127 *aligned_dst++ = *aligned_src++; |
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128 } |
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129 |
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130 dst = (char *)aligned_dst; |
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131 src = (const char *)aligned_src; |
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132 |
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133 while (n > 0) |
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134 { |
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135 --n; |
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136 if ((*dst++ = *src++) == '\0') |
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137 break; |
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138 } |
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139 |
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140 while (n-- > 0) |
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141 *dst++ = '\0'; |
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142 |
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143 CYG_REPORT_RETVAL( s1 ); |
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144 |
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145 return s1; |
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146 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || |
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147 // defined(__OPTIMIZE_SIZE__) |
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148 } // _strncpy() |
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149 |
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150 #endif // ifdef CYGPKG_LIBC |
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151 |
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152 // EOF strncpy.cxx |
