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annotate packages/language/c/libc/string/current/src/memcmp.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
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children 4c750ce71ae3
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1 //===========================================================================
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2 //
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3 // memcmp.cxx
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4 //
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5 // ANSI standard memcmp() 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
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60 // EXPORTED SYMBOLS
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61
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62 externC int
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63 memcmp( const void *s1, const void *s2, size_t n ) \
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64 CYGBLD_ATTRIB_WEAK_ALIAS(__memcmp);
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65
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66 // FUNCTIONS
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67
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68 int
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69 __memcmp( const void *s1, const void *s2, size_t n )
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70 {
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71 int retval;
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72
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73 CYG_REPORT_FUNCNAMETYPE( "__memcmp", "returning %d" );
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74 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
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75
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76 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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77 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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78
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79 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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80 const unsigned char *m1 = (const unsigned char *) s1;
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81 const unsigned char *m2 = (const unsigned char *) s2;
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82
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83 while (n--)
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84 {
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85 if (*m1 != *m2)
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86 {
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87 retval = *m1 - *m2;
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88 CYG_REPORT_RETVAL( retval );
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89 return retval;
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90 }
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91 m1++;
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92 m2++;
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93 }
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94 CYG_REPORT_RETVAL( 0 );
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95 return 0;
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96 #else
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97 const unsigned char *m1 = (const unsigned char *) s1;
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98 const unsigned char *m2 = (const unsigned char *) s2;
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99 const CYG_WORD *aligned_m1;
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100 const CYG_WORD *aligned_m2;
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101
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102 // If the size is too small, or either pointer is unaligned,
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103 // then we punt to the byte compare loop. Hopefully this will
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104 // not turn up in inner loops.
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105 if (CYG_LIBC_STR_OPT_TOO_SMALL(n) || CYG_LIBC_STR_UNALIGNED2(m1,m2))
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106 {
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107 while (n--)
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108 {
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109 if (*m1 != *m2)
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110 {
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111 retval = *m1 - *m2;
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112 CYG_REPORT_RETVAL( retval );
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113 return retval;
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114 }
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115 m1++;
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116 m2++;
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117 }
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118 CYG_REPORT_RETVAL( 0 );
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119 return 0;
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120 }
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121
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122 // Otherwise, load and compare the blocks of memory one
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123 // word at a time.
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124 aligned_m1 = (const CYG_WORD *) m1;
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125 aligned_m2 = (const CYG_WORD *) m2;
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126 while (n > CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE)
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127 {
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128 if (*aligned_m1 != *aligned_m2)
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129 {
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130 // This block of characters has a mismatch, somewhere.
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131 // xoring them together and then testing for null would
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132 // be fastest, but this is clearer code.
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133 m1 = (const unsigned char *)aligned_m1;
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134 m2 = (const unsigned char *)aligned_m2;
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135 while (n--)
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136 {
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137 if (*m1 != *m2)
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138 {
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139 retval = *m1 - *m2;
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140 CYG_REPORT_RETVAL( retval );
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141 return retval;
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142 }
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143 m1++;
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144 m2++;
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145 }
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146 // NOT REACHED
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147 }
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148 aligned_m1++;
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149 aligned_m2++;
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150 n -= CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE;
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151 }
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152
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153 // checking the last few characters
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154
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155 m1 = (const unsigned char *)aligned_m1;
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156 m2 = (const unsigned char *)aligned_m2;
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157
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158 while (n--)
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159 {
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160 if (*m1 != *m2)
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161 {
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162 retval = *m1 - *m2;
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163 CYG_REPORT_RETVAL( retval );
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164 return retval;
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165 }
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166 m1++;
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167 m2++;
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168 }
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169
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170 CYG_REPORT_RETVAL( 0 );
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171 return 0;
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172 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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173 // defined(__OPTIMIZE_SIZE__)
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174 } // __memcmp()
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175
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176 // EOF memcmp.cxx