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annotate packages/language/c/libc/string/current/src/memchr.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
parents
children 4c750ce71ae3
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1 //===========================================================================
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2 //
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3 // memchr.cxx
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4 //
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5 // ANSI standard memchr() 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 void *
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62 memchr( const void *s, int c, size_t n ) CYGBLD_ATTRIB_WEAK_ALIAS(__memchr);
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63
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64 // FUNCTIONS
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65
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66 void *
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67 __memchr( const void *s, int c, size_t n )
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68 {
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69 CYG_REPORT_FUNCNAMETYPE( "__memchr", "returning addr %08x" );
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70 CYG_REPORT_FUNCARG3( "s=%08x, c=%d, n=%d", s, c, n );
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71
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72 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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73
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74 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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75 const unsigned char *src = (const unsigned char *) s;
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76
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77 c &= 0xff;
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78
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79 while (n--)
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80 {
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81 if (*src == c)
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82 {
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83 CYG_REPORT_RETVAL( src );
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84 return (void *) src;
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85 } // if
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86 src++;
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87 }
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88 CYG_REPORT_RETVAL( NULL );
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89 return NULL;
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90 #else
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91 const unsigned char *src = (const unsigned char *) s;
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92 CYG_WORD *aligned_src;
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93 CYG_WORD buffer;
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94 CYG_WORD mask;
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95 cyg_ucount8 i;
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96
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97 c &= 0xff;
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98
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99 // If the size is small, or src is unaligned, then
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100 // use the bytewise loop. We can hope this is rare.
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101 if (CYG_LIBC_STR_OPT_TOO_SMALL (n) || CYG_LIBC_STR_UNALIGNED (src))
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102 {
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103 while (n--)
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104 {
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105 if (*src == c)
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106 {
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107 CYG_REPORT_RETVAL( src );
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108 return (void *) src;
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109 } // if
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110 src++;
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111 }
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112 CYG_REPORT_RETVAL( NULL );
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113 return NULL;
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114 }
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115
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116 // The fast code reads the ASCII one word at a time and only
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117 // performs the bytewise search on word-sized segments if they
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118 // contain the search character, which is detected by XORing
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119 // the word-sized segment with a word-sized block of the search
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120 // character and then detecting for the presence of NULL in the
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121 // result.
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122
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123 aligned_src = (CYG_WORD *) src;
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124 mask = 0;
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125 for (i = 0; i < CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE; i++)
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126 mask = (mask << 8) + c;
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127
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128 while (n > CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE)
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129 {
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130 buffer = *aligned_src;
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131 buffer ^= mask;
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132 if (CYG_LIBC_STR_DETECTNULL (buffer))
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133 {
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134 src = (unsigned char*) aligned_src;
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135 for ( i = 0; i < CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE; i++ )
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136 {
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137 if (*src == c)
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138 {
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139 CYG_REPORT_RETVAL( src );
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140 return (void *) src;
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141 } // if
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142 src++;
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143 }
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144 }
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145 n -= CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE;
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146 aligned_src++;
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147 }
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148
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149 // If there are fewer than CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE characters
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150 // left, then we resort to the bytewise loop.
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151
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152 src = (const unsigned char *) aligned_src;
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153 while (n--)
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154 {
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155 if (*src == c)
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156 {
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157 CYG_REPORT_RETVAL( src );
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158 return (void *) src;
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159 } // if
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160 src++;
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161 }
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162
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163 CYG_REPORT_RETVAL( NULL );
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164 return NULL;
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165 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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166 // defined(__OPTIMIZE_SIZE__)
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167 } // __memchr()
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168
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169 // EOF memchr.cxx