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annotate packages/language/c/libc/string/current/src/strcmp.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 e0c0827131d1
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1 //===========================================================================
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2 //
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3 // strcmp.cxx
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4 //
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5 // ANSI standard strcmp() 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 int
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62 strcmp( const char *s1, const char *s2 ) CYGBLD_ATTRIB_WEAK_ALIAS(__strcmp);
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63
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64 // FUNCTIONS
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65
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66 int
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67 __strcmp( const char *s1, const char *s2 )
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68 {
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69 CYG_REPORT_FUNCNAMETYPE( "__strcmp", "returning %d" );
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70 CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 );
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71
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72 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" );
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73 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" );
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74
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75 int retval;
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76
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77 CYG_UNUSED_PARAM( int, retval ); // in case tracing is off
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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 while (*s1 != '\0' && *s1 == *s2)
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81 {
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82 s1++;
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83 s2++;
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84 }
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85
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86 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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87
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88 CYG_REPORT_RETVAL( retval );
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89
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90 return retval;
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91 #else
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92 const CYG_WORD *aligned_s1;
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93 const CYG_WORD *aligned_s2;
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94
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95 // If s1 or s2 are unaligned, then compare bytes.
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96 if (CYG_LIBC_STR_UNALIGNED2 (s1, s2))
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97 {
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98 while (*s1 != '\0' && *s1 == *s2)
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99 {
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100 s1++;
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101 s2++;
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102 }
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103 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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104
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105 CYG_REPORT_RETVAL( retval );
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106
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107 return retval;
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108 }
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109
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110 // If s1 and s2 are word-aligned, compare them a word at a time.
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111 aligned_s1 = (const CYG_WORD *)s1;
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112 aligned_s2 = (const CYG_WORD *)s2;
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113 while (*aligned_s1 == *aligned_s2)
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114 {
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115 // To get here, *aligned_s1 == *aligned_s2, thus if we find a
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116 // null in *aligned_s1, then the strings must be equal, so return
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117 // zero.
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118 if (CYG_LIBC_STR_DETECTNULL (*aligned_s1))
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119 {
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120 CYG_REPORT_RETVAL( 0 );
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121 return 0;
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122 } // if
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123
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124 aligned_s1++;
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125 aligned_s2++;
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126 }
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127
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128 // A difference was detected in last few bytes of s1, so search bytewise
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129 s1 = (const char *)aligned_s1;
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130 s2 = (const char *)aligned_s2;
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131
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132 while (*s1 != '\0' && *s1 == *s2)
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133 {
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134 s1++;
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135 s2++;
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136 }
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137
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138 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2);
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139
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140 CYG_REPORT_RETVAL( retval );
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141
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142 return retval;
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143
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144 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) ||
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145 // defined(__OPTIMIZE_SIZE__)
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146 } // __strcmp()
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147
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148 // EOF strcmp.cxx