Mercurial > flash_v2
diff packages/language/c/libc/string/current/src/strcmp.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21
Merge from eCos master repository on 2000-08-21-22:40:54-BST
| author | jlarmour |
|---|---|
| date | Fri, 25 Aug 2000 17:32:38 +0000 |
| parents | |
| children | e0c0827131d1 |
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new file mode 100644 --- /dev/null +++ b/packages/language/c/libc/string/current/src/strcmp.cxx @@ -0,0 +1,148 @@ +//=========================================================================== +// +// strcmp.cxx +// +// ANSI standard strcmp() routine +// +//=========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Red Hat eCos Public License +// Version 1.1 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://www.redhat.com/ +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Configurable Operating System, +// released September 30, 1998. +// +// The Initial Developer of the Original Code is Red Hat. +// Portions created by Red Hat are +// Copyright (C) 1998, 1999, 2000 Red Hat, Inc. +// All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//=========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): jlarmour +// Contributors: +// Date: 2000-04-14 +// Purpose: +// Description: +// Usage: +// +//####DESCRIPTIONEND#### +// +//=========================================================================== + +// CONFIGURATION + +#include <pkgconf/libc_string.h> // Configuration header + +// INCLUDES + +#include <cyg/infra/cyg_type.h> // Common type definitions +#include <cyg/infra/cyg_trac.h> // Tracing support +#include <cyg/infra/cyg_ass.h> // Assertion support +#include <string.h> // Header for this file +#include <stddef.h> // Compiler definitions such as size_t, NULL etc. +#include <cyg/libc/string/stringsupp.hxx> // Useful string function support and + // prototypes + +// EXPORTED SYMBOLS + +externC int +strcmp( const char *s1, const char *s2 ) CYGBLD_ATTRIB_WEAK_ALIAS(__strcmp); + +// FUNCTIONS + +int +__strcmp( const char *s1, const char *s2 ) +{ + CYG_REPORT_FUNCNAMETYPE( "__strcmp", "returning %d" ); + CYG_REPORT_FUNCARG2( "s1=%08x, s2=%08x", s1, s2 ); + + CYG_CHECK_DATA_PTR( s1, "s1 is not a valid pointer!" ); + CYG_CHECK_DATA_PTR( s2, "s2 is not a valid pointer!" ); + + int retval; + + CYG_UNUSED_PARAM( int, retval ); // in case tracing is off + +#if defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || defined(__OPTIMIZE_SIZE__) + while (*s1 != '\0' && *s1 == *s2) + { + s1++; + s2++; + } + + retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); + + CYG_REPORT_RETVAL( retval ); + + return retval; +#else + const CYG_WORD *aligned_s1; + const CYG_WORD *aligned_s2; + + // If s1 or s2 are unaligned, then compare bytes. + if (CYG_LIBC_STR_UNALIGNED2 (s1, s2)) + { + while (*s1 != '\0' && *s1 == *s2) + { + s1++; + s2++; + } + retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); + + CYG_REPORT_RETVAL( retval ); + + return retval; + } + + // If s1 and s2 are word-aligned, compare them a word at a time. + aligned_s1 = (const CYG_WORD *)s1; + aligned_s2 = (const CYG_WORD *)s2; + while (*aligned_s1 == *aligned_s2) + { + // To get here, *aligned_s1 == *aligned_s2, thus if we find a + // null in *aligned_s1, then the strings must be equal, so return + // zero. + if (CYG_LIBC_STR_DETECTNULL (*aligned_s1)) + { + CYG_REPORT_RETVAL( 0 ); + return 0; + } // if + + aligned_s1++; + aligned_s2++; + } + + // A difference was detected in last few bytes of s1, so search bytewise + s1 = (const char *)aligned_s1; + s2 = (const char *)aligned_s2; + + while (*s1 != '\0' && *s1 == *s2) + { + s1++; + s2++; + } + + retval = (*(unsigned char *) s1) - (*(unsigned char *) s2); + + CYG_REPORT_RETVAL( retval ); + + return retval; + +#endif // not defined(CYGIMP_LIBC_STRING_PREFER_SMALL_TO_FAST) || + // defined(__OPTIMIZE_SIZE__) +} // __strcmp() + +// EOF strcmp.cxx
