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annotate packages/language/c/libc/current/src/string/strcmp.cxx @ 64:c38311975d4f ecos-sw-2000-01-28
Merge from eCos master repository on 2000-01-28-04:28:11-GMT
| author | jlarmour |
|---|---|
| date | Fri, 28 Jan 2000 04:59:39 +0000 |
| parents | 443894e2e912 |
| children | bf00f99aec69 |
| rev | line source |
|---|---|
| 0 | 1 //=========================================================================== |
| 2 // | |
| 3 // strcmp.cxx | |
| 4 // | |
| 5 // ANSI standard strcmp() routine | |
| 6 // | |
| 7 //=========================================================================== | |
| 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 1.0 (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 |
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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 // |
| 0 | 30 //####COPYRIGHTEND#### |
| 31 //=========================================================================== | |
| 32 //#####DESCRIPTIONBEGIN#### | |
| 33 // | |
| 34 // Author(s): jlarmour | |
| 2 | 35 // Contributors: jlarmour |
| 0 | 36 // Date: 1998-02-13 |
| 37 // Purpose: | |
| 38 // Description: | |
| 39 // Usage: | |
| 40 // | |
| 41 //####DESCRIPTIONEND#### | |
| 42 // | |
| 43 //=========================================================================== | |
| 44 | |
| 45 // CONFIGURATION | |
| 46 | |
| 47 #include <pkgconf/libc.h> // Configuration header | |
| 48 | |
| 49 // Include the C library? | |
| 50 #ifdef CYGPKG_LIBC | |
| 51 | |
| 52 // INCLUDES | |
| 53 | |
| 54 #include <cyg/infra/cyg_type.h> // Common type definitions | |
| 55 #include <cyg/infra/cyg_trac.h> // Tracing support | |
| 56 #include <cyg/infra/cyg_ass.h> // Assertion support | |
| 57 #include <string.h> // Header for this file | |
| 58 #include <stddef.h> // Compiler definitions such as size_t, NULL etc. | |
| 59 #include "clibincl/stringsupp.hxx" // Useful string function support and | |
| 60 // prototypes | |
| 61 | |
| 62 // EXPORTED SYMBOLS | |
| 63 | |
| 64 externC int | |
| 65 strcmp( const char *s1, const char *s2 ) CYGPRI_LIBC_WEAK_ALIAS("_strcmp"); | |
| 66 | |
| 67 // FUNCTIONS | |
| 68 | |
| 69 int | |
| 70 _strcmp( const char *s1, const char *s2 ) | |
| 71 { | |
| 72 CYG_REPORT_FUNCNAMETYPE( "_strcmp", "returning %d" ); | |
| 73 CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 ); | |
| 74 | |
| 75 CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); | |
| 76 CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); | |
| 77 | |
| 78 int retval; | |
| 79 | |
| 80 CYG_UNUSED_PARAM( int, retval ); // in case tracing is off | |
| 81 | |
| 82 #if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) | |
| 83 while (*s1 != '\0' && *s1 == *s2) | |
| 84 { | |
| 85 s1++; | |
| 86 s2++; | |
| 87 } | |
| 88 | |
| 89 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); | |
| 90 | |
| 91 CYG_REPORT_RETVAL( retval ); | |
| 92 | |
| 93 return retval; | |
| 94 #else | |
| 95 const CYG_WORD *aligned_s1; | |
| 96 const CYG_WORD *aligned_s2; | |
| 97 | |
| 98 // If s1 or s2 are unaligned, then compare bytes. | |
| 99 if (CYG_LIBC_STR_UNALIGNED2 (s1, s2)) | |
| 100 { | |
| 101 while (*s1 != '\0' && *s1 == *s2) | |
| 102 { | |
| 103 s1++; | |
| 104 s2++; | |
| 105 } | |
| 106 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); | |
| 107 | |
| 108 CYG_REPORT_RETVAL( retval ); | |
| 109 | |
| 110 return retval; | |
| 111 } | |
| 112 | |
| 113 // If s1 and s2 are word-aligned, compare them a word at a time. | |
| 114 aligned_s1 = (const CYG_WORD *)s1; | |
| 115 aligned_s2 = (const CYG_WORD *)s2; | |
| 116 while (*aligned_s1 == *aligned_s2) | |
| 117 { | |
| 118 // To get here, *aligned_s1 == *aligned_s2, thus if we find a | |
| 119 // null in *aligned_s1, then the strings must be equal, so return | |
| 120 // zero. | |
| 121 if (CYG_LIBC_STR_DETECTNULL (*aligned_s1)) | |
| 122 { | |
| 123 CYG_REPORT_RETVAL( 0 ); | |
| 124 return 0; | |
| 125 } // if | |
| 126 | |
| 127 aligned_s1++; | |
| 128 aligned_s2++; | |
| 129 } | |
| 130 | |
| 131 // A difference was detected in last few bytes of s1, so search bytewise | |
| 132 s1 = (const char *)aligned_s1; | |
| 133 s2 = (const char *)aligned_s2; | |
| 134 | |
| 135 while (*s1 != '\0' && *s1 == *s2) | |
| 136 { | |
| 137 s1++; | |
| 138 s2++; | |
| 139 } | |
| 140 | |
| 141 retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); | |
| 142 | |
| 143 CYG_REPORT_RETVAL( retval ); | |
| 144 | |
| 145 return retval; | |
| 146 | |
| 147 #endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || | |
| 148 // defined(__OPTIMIZE_SIZE__) | |
| 149 } // _strcmp() | |
| 150 | |
| 151 #endif // ifdef CYGPKG_LIBC | |
| 152 | |
| 153 // EOF strcmp.cxx |