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