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annotate packages/language/c/libc/string/current/src/strchr.cxx @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //===========================================================================
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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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //===========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): jlarmour
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43 // Contributors:
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44 // Date: 2000-04-14
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45 // Purpose:
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46 // Description:
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47 // Usage:
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //===========================================================================
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52
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53 // CONFIGURATION
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54
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55 #include <pkgconf/libc_string.h> // Configuration header
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56
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57 // INCLUDES
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58
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59 #include <cyg/infra/cyg_type.h> // Common type definitions
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60 #include <cyg/infra/cyg_trac.h> // Tracing support
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61 #include <cyg/infra/cyg_ass.h> // Assertion support
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62 #include <string.h> // Header for this file
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63 #include <stddef.h> // Compiler definitions such as size_t, NULL etc.
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64 #include <cyg/libc/string/stringsupp.hxx> // Useful string function support and
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65 // prototypes
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66
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67 // EXPORTED SYMBOLS
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68
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69 externC char *
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70 strchr( const char *s, int c ) CYGBLD_ATTRIB_WEAK_ALIAS(__strchr);
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71
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72 // MACROS
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73
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74 // DETECTCHAR returns nonzero if X contains the byte used
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75 // to fill MASK.
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76 #define DETECTCHAR(X,MASK) (CYG_LIBC_STR_DETECTNULL( (X) ^ (MASK) ))
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77
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78 // FUNCTIONS
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79
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80 char *
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81 __strchr( const char *s, int c )
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82 {
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83 CYG_REPORT_FUNCNAMETYPE( "__strchr", "returning %08x" );
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84 CYG_REPORT_FUNCARG2( "s=%08x, c=%d", s, c );
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85
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86 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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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 charc = c;
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90
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91 while (*s && *s != charc)
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92 {
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93 s++;
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94 }
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95
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96 if (*s != charc)
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97 {
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98 s = NULL;
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99 }
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100
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101 CYG_REPORT_RETVAL( s );
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102
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103 return (char *) s;
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104 #else
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105 char charc = c;
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106 CYG_WORD mask;
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107 CYG_WORD j;
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108 CYG_WORD *aligned_addr;
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109
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110 if (CYG_LIBC_STR_UNALIGNED (s))
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111 {
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112 while (*s && *s != charc)
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113 s++;
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114 if (*s != charc)
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115 s = NULL;
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116
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117 CYG_REPORT_RETVAL( s );
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118
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119 return (char *) s;
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120 }
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121
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122 for (j = 0, mask = 0; j < sizeof(mask); j++)
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123 mask = (mask << 8) + charc;
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124
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125 aligned_addr = (CYG_WORD *)s;
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126 while (!CYG_LIBC_STR_DETECTNULL (*aligned_addr) &&
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127 !DETECTCHAR (*aligned_addr, mask))
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128 aligned_addr++;
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129
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130 // The block of bytes currently pointed to by aligned_addr
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131 // contains either a null or the target char, or both. We
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132 // catch it using the bytewise search.
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133
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134 s = (char *)aligned_addr;
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135 while (*s && *s != charc)
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136 s++;
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137 if (*s != charc)
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138 s = NULL;
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139
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140 CYG_REPORT_RETVAL( s );
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141
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142 return (char *)s;
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143 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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144 // defined(__OPTIMIZE_SIZE__)
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145 } // __strchr()
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146
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
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147 // EOF strchr.cxx