Mercurial > ecos-v3_0-branch
annotate packages/language/c/libc/string/current/src/strncpy.cxx @ 210:d2c90368aeef
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| author | jlarmour |
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| date | Thu, 23 May 2002 22:59:51 +0000 |
| parents | e0c0827131d1 |
| children | 74dbf4c3f2e1 |
| rev | line source |
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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 //####ECOSGPLCOPYRIGHTBEGIN#### |
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9 // ------------------------------------------- |
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10 // This file is part of eCos, the Embedded Configurable Operating System. |
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. |
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12 // |
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13 // eCos is free software; you can redistribute it and/or modify it under |
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14 // the terms of the GNU General Public License as published by the Free |
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15 // Software Foundation; either version 2 or (at your option) any later version. |
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16 // |
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY |
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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20 // for more details. |
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21 // |
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22 // You should have received a copy of the GNU General Public License along |
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23 // with eCos; if not, write to the Free Software Foundation, Inc., |
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
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25 // |
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26 // As a special exception, if other files instantiate templates or use macros |
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27 // or inline functions from this file, or you compile this file and link it |
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28 // with other works to produce a work based on this file, this file does not |
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29 // by itself cause the resulting work to be covered by the GNU General Public |
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30 // License. However the source code for this file must still be made available |
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31 // in accordance with section (3) of the GNU General Public License. |
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32 // |
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33 // This exception does not invalidate any other reasons why a work based on |
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34 // this file might be covered by the GNU General Public License. |
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35 // |
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. |
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37 // at http://sources.redhat.com/ecos/ecos-license/ |
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38 // ------------------------------------------- |
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39 //####ECOSGPLCOPYRIGHTEND#### |
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40 //=========================================================================== |
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41 //#####DESCRIPTIONBEGIN#### |
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42 // |
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43 // Author(s): jlarmour |
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44 // Contributors: |
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45 // Date: 2000-04-14 |
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46 // Purpose: |
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47 // Description: |
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48 // Usage: |
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49 // |
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50 //####DESCRIPTIONEND#### |
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51 // |
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52 //=========================================================================== |
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53 |
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54 // CONFIGURATION |
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55 |
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56 #include <pkgconf/libc_string.h> // Configuration header |
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57 |
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58 // INCLUDES |
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59 |
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60 #include <cyg/infra/cyg_type.h> // Common type definitions |
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61 #include <cyg/infra/cyg_trac.h> // Tracing support |
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62 #include <cyg/infra/cyg_ass.h> // Assertion support |
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63 #include <string.h> // Header for this file |
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64 #include <stddef.h> // Compiler definitions such as size_t, NULL etc. |
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65 #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and |
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66 // prototypes |
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67 |
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68 // EXPORTED SYMBOLS |
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69 |
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70 externC char * |
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71 strncpy( char *s1, const char *s2, size_t n ) \ |
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72 CYGBLD_ATTRIB_WEAK_ALIAS(__strncpy); |
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73 |
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74 // FUNCTIONS |
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75 |
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76 char * |
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77 __strncpy( char *s1, const char *s2, size_t n) |
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78 { |
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79 CYG_REPORT_FUNCNAMETYPE( "__strncpy", "returning %08x" ); |
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80 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n ); |
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81 |
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82 if (n) |
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83 { |
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84 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); |
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85 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); |
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86 } |
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87 |
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88 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) |
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89 char *dscan; |
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90 const char *sscan; |
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91 |
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92 dscan = s1; |
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93 sscan = s2; |
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94 while (n > 0) |
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95 { |
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96 --n; |
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97 if ((*dscan++ = *sscan++) == '\0') |
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98 break; |
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99 } |
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100 while (n-- > 0) |
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101 *dscan++ = '\0'; |
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102 |
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103 CYG_REPORT_RETVAL( s1 ); |
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104 |
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105 return s1; |
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106 #else |
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107 char *dst = s1; |
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108 const char *src = s2; |
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109 CYG_WORD *aligned_dst; |
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110 const CYG_WORD *aligned_src; |
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111 |
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112 // If SRC and DEST is aligned and count large enough, then copy words. |
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113 if (!CYG_LIBC_STR_UNALIGNED2 (src, dst) && |
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114 !CYG_LIBC_STR_OPT_TOO_SMALL (n)) { |
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115 |
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116 aligned_dst = (CYG_WORD *)dst; |
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117 aligned_src = (CYG_WORD *)src; |
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118 |
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119 // SRC and DEST are both "CYG_WORD" aligned, try to do "CYG_WORD" |
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120 // sized copies. |
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121 while (n >= sizeof (CYG_WORD) && |
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122 !CYG_LIBC_STR_DETECTNULL(*aligned_src)) { |
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123 |
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124 n -= sizeof (CYG_WORD); |
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125 *aligned_dst++ = *aligned_src++; |
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126 } |
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127 |
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128 dst = (char *)aligned_dst; |
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129 src = (const char *)aligned_src; |
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130 } // if |
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131 |
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132 while (n > 0) |
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133 { |
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134 --n; |
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135 if ((*dst++ = *src++) == '\0') |
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136 break; |
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137 } |
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138 |
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139 while (n-- > 0) |
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140 *dst++ = '\0'; |
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141 |
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142 CYG_REPORT_RETVAL( s1 ); |
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143 |
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144 return s1; |
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145 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || |
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146 // defined(__OPTIMIZE_SIZE__) |
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147 } // __strncpy() |
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148 |
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149 // EOF strncpy.cxx |
