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annotate packages/language/c/libc/string/current/src/strchr.cxx @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents 6ed91473a1cd
children d2c90368aeef
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1 //===========================================================================
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2 //
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3 // strchr.cxx
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4 //
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5 // ANSI standard strchr() routine
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6 //
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7 //===========================================================================
208
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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####
115
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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 strchr( const char *s, int c ) CYGBLD_ATTRIB_WEAK_ALIAS(__strchr);
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72
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73 // MACROS
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74
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75 // DETECTCHAR returns nonzero if X contains the byte used
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76 // to fill MASK.
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77 #define DETECTCHAR(X,MASK) (CYG_LIBC_STR_DETECTNULL( (X) ^ (MASK) ))
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78
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79 // FUNCTIONS
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80
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81 char *
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82 __strchr( const char *s, int c )
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83 {
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84 CYG_REPORT_FUNCNAMETYPE( "__strchr", "returning %08x" );
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85 CYG_REPORT_FUNCARG2( "s=%08x, c=%d", s, c );
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86
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87 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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88
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89 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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90 char charc = c;
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91
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92 while (*s && *s != charc)
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93 {
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94 s++;
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95 }
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96
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97 if (*s != charc)
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98 {
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99 s = NULL;
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100 }
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101
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102 CYG_REPORT_RETVAL( s );
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103
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104 return (char *) s;
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105 #else
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106 char charc = c;
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107 CYG_WORD mask;
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108 CYG_WORD j;
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109 CYG_WORD *aligned_addr;
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110
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111 if (CYG_LIBC_STR_UNALIGNED (s))
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112 {
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113 while (*s && *s != charc)
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114 s++;
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115 if (*s != charc)
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116 s = NULL;
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117
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118 CYG_REPORT_RETVAL( s );
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119
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120 return (char *) s;
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121 }
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122
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123 for (j = 0, mask = 0; j < sizeof(mask); j++)
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124 mask = (mask << 8) + charc;
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125
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126 aligned_addr = (CYG_WORD *)s;
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127 while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr) &&
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128 !DETECTCHAR (*aligned_addr, mask))
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129 aligned_addr++;
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130
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131 // The block of bytes currently pointed to by aligned_addr
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132 // contains either a null or the target char, or both. We
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133 // catch it using the bytewise search.
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134
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135 s = (char *)aligned_addr;
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136 while (*s && *s != charc)
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137 s++;
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138 if (*s != charc)
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139 s = NULL;
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140
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141 CYG_REPORT_RETVAL( s );
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142
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143 return (char *)s;
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144 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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145 // defined(__OPTIMIZE_SIZE__)
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146 } // __strchr()
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147
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148 // EOF strchr.cxx