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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 Cygnus eCos Public License |
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12 // Version 1.0 (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://sourceware.cygnus.com/ecos |
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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 Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //=========================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour@cygnus.co.uk |
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34 // Date: 1998-02-13 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //=========================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // Configuration header |
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46 |
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47 // Include the C library? |
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48 #ifdef CYGPKG_LIBC |
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49 |
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50 // INCLUDES |
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51 |
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52 #include <cyg/infra/cyg_type.h> // Common type definitions |
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53 #include <cyg/infra/cyg_trac.h> // Tracing support |
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54 #include <cyg/infra/cyg_ass.h> // Assertion support |
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55 #include <string.h> // Header for this file |
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56 #include <stddef.h> // Compiler definitions such as size_t, NULL etc. |
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57 #include "clibincl/stringsupp.hxx" // Useful string function support and |
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58 // prototypes |
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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 strcmp( const char *s1, const char *s2 ) CYGPRI_LIBC_WEAK_ALIAS("_strcmp"); |
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64 |
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65 // FUNCTIONS |
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66 |
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67 int |
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68 _strcmp( const char *s1, const char *s2 ) |
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69 { |
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70 CYG_REPORT_FUNCNAMETYPE( "_strcmp", "returning %d" ); |
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71 CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 ); |
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72 |
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73 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); |
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74 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); |
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75 |
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76 int retval; |
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77 |
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78 CYG_UNUSED_PARAM( int, retval ); // in case tracing is off |
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79 |
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80 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) |
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81 while (*s1 != '\0' && *s1 == *s2) |
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82 { |
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83 s1++; |
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84 s2++; |
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85 } |
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86 |
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87 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); |
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88 |
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89 CYG_REPORT_RETVAL( retval ); |
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90 |
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91 return retval; |
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92 #else |
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93 const CYG_WORD *aligned_s1; |
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94 const CYG_WORD *aligned_s2; |
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95 |
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96 // If s1 or s2 are unaligned, then compare bytes. |
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97 if (CYG_LIBC_STR_UNALIGNED2 (s1, s2)) |
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98 { |
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99 while (*s1 != '\0' && *s1 == *s2) |
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100 { |
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101 s1++; |
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102 s2++; |
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103 } |
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104 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); |
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105 |
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106 CYG_REPORT_RETVAL( retval ); |
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107 |
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108 return retval; |
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109 } |
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110 |
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111 // If s1 and s2 are word-aligned, compare them a word at a time. |
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112 aligned_s1 = (const CYG_WORD *)s1; |
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113 aligned_s2 = (const CYG_WORD *)s2; |
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114 while (*aligned_s1 == *aligned_s2) |
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115 { |
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116 // To get here, *aligned_s1 == *aligned_s2, thus if we find a |
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117 // null in *aligned_s1, then the strings must be equal, so return |
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118 // zero. |
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119 if (CYG_LIBC_STR_DETECTNULL (*aligned_s1)) |
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120 { |
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121 CYG_REPORT_RETVAL( 0 ); |
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122 return 0; |
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123 } // if |
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124 |
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125 aligned_s1++; |
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126 aligned_s2++; |
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127 } |
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128 |
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129 // A difference was detected in last few bytes of s1, so search bytewise |
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130 s1 = (const char *)aligned_s1; |
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131 s2 = (const char *)aligned_s2; |
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132 |
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133 while (*s1 != '\0' && *s1 == *s2) |
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134 { |
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135 s1++; |
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136 s2++; |
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137 } |
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138 |
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139 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); |
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140 |
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141 CYG_REPORT_RETVAL( retval ); |
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142 |
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143 return retval; |
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144 |
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145 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || |
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146 // defined(__OPTIMIZE_SIZE__) |
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147 } // _strcmp() |
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148 |
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149 #endif // ifdef CYGPKG_LIBC |
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150 |
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151 // EOF strcmp.cxx |
