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annotate packages/language/c/libc/string/current/src/memcmp.cxx @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 74dbf4c3f2e1
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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 //####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/
208
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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
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69 // EXPORTED SYMBOLS
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70
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71 externC int
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72 memcmp( const void *s1, const void *s2, size_t n ) \
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73 CYGBLD_ATTRIB_WEAK_ALIAS(__memcmp);
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74
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75 // FUNCTIONS
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76
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77 int
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78 __memcmp( const void *s1, const void *s2, size_t n )
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79 {
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80 int retval;
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81
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82 CYG_REPORT_FUNCNAMETYPE( "__memcmp", "returning %d" );
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83 CYG_REPORT_FUNCARG3( "s1=%08x, s2=%08x, n=%d", s1, s2, n );
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84
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85 if (n)
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86 {
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87 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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88 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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89 }
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90
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91 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__)
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92 const unsigned char *m1 = (const unsigned char *) s1;
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93 const unsigned char *m2 = (const unsigned char *) s2;
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94
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95 while (n--)
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96 {
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97 if (*m1 != *m2)
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98 {
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99 retval = *m1 - *m2;
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100 CYG_REPORT_RETVAL( retval );
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101 return retval;
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102 }
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103 m1++;
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104 m2++;
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105 }
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106 CYG_REPORT_RETVAL( 0 );
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107 return 0;
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108 #else
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109 const unsigned char *m1 = (const unsigned char *) s1;
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110 const unsigned char *m2 = (const unsigned char *) s2;
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111 const CYG_WORD *aligned_m1;
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112 const CYG_WORD *aligned_m2;
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113
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114 // If the size is too small, or either pointer is unaligned,
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115 // then we punt to the byte compare loop. Hopefully this will
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116 // not turn up in inner loops.
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117 if (CYG_LIBC_STR_OPT_TOO_SMALL(n) || CYG_LIBC_STR_UNALIGNED2(m1,m2))
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118 {
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119 while (n--)
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120 {
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121 if (*m1 != *m2)
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122 {
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123 retval = *m1 - *m2;
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124 CYG_REPORT_RETVAL( retval );
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125 return retval;
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126 }
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127 m1++;
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128 m2++;
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129 }
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130 CYG_REPORT_RETVAL( 0 );
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131 return 0;
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132 }
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133
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134 // Otherwise, load and compare the blocks of memory one
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135 // word at a time.
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136 aligned_m1 = (const CYG_WORD *) m1;
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137 aligned_m2 = (const CYG_WORD *) m2;
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138 while (n > CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE)
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139 {
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140 if (*aligned_m1 != *aligned_m2)
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141 {
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142 // This block of characters has a mismatch, somewhere.
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143 // xoring them together and then testing for null would
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144 // be fastest, but this is clearer code.
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145 m1 = (const unsigned char *)aligned_m1;
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146 m2 = (const unsigned char *)aligned_m2;
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147 while (n--)
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148 {
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149 if (*m1 != *m2)
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150 {
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151 retval = *m1 - *m2;
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152 CYG_REPORT_RETVAL( retval );
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153 return retval;
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154 }
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155 m1++;
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156 m2++;
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157 }
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158 // NOT REACHED
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159 }
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160 aligned_m1++;
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161 aligned_m2++;
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162 n -= CYG_LIBC_STR_OPT_LITTLEBLOCKSIZE;
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163 }
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164
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165 // checking the last few characters
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166
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167 m1 = (const unsigned char *)aligned_m1;
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168 m2 = (const unsigned char *)aligned_m2;
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169
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170 while (n--)
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171 {
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172 if (*m1 != *m2)
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173 {
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174 retval = *m1 - *m2;
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175 CYG_REPORT_RETVAL( retval );
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176 return retval;
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177 }
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178 m1++;
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179 m2++;
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180 }
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181
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182 CYG_REPORT_RETVAL( 0 );
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183 return 0;
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184 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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185 // defined(__OPTIMIZE_SIZE__)
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186 } // __memcmp()
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187
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188 // EOF memcmp.cxx