Mercurial > ecos-v3_0-branch
diff packages/language/c/libc/stdlib/current/src/bsearch.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/stdlib/current/src/bsearch.cxx @@ -0,0 +1,123 @@ +//=========================================================================== +// +// bsearch.cxx +// +// ANSI standard binary search function defined in section 7.10.5.1 +// of the standard +// +//=========================================================================== +//####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: 2000-04-30 +// Purpose: +// Description: +// Usage: +// +//####DESCRIPTIONEND#### +// +//=========================================================================== + +// CONFIGURATION + +#include <pkgconf/libc_stdlib.h> // Configuration header + +// INCLUDES + +#include <cyg/infra/cyg_type.h> // Common type definitions and support +#include <cyg/infra/cyg_trac.h> // Tracing support +#include <cyg/infra/cyg_ass.h> // Assertion support +#include <stdlib.h> // Header for all stdlib functions + // (like this one) + +// TRACING + +# if defined(CYGDBG_USE_TRACING) && \ + defined(CYGNUM_LIBC_BSEARCH_TRACE_LEVEL) +static int bsearch_trace = CYGNUM_LIBC_BSEARCH_TRACE_LEVEL; +# define TL1 (0 < bsearch_trace) +# else +# define TL1 (0) +# endif + + +// FUNCTIONS + +externC void * +bsearch( const void *key, const void *base, size_t nmemb, size_t size, + __bsearch_comparison_fn_t compar ) +{ + CYG_REPORT_FUNCNAMETYPE( "bsearch", "returning %08x" ); + + CYG_REPORT_FUNCARG5( "key=%08x, base=%08x, nmemb=%d, size=%d, " + "compar=%08x", key, base, nmemb, size, compar ); + + CYG_CHECK_DATA_PTR( key, "key is not a valid pointer!" ); + CYG_CHECK_DATA_PTR( base, "base is not a valid pointer!" ); + CYG_CHECK_FUNC_PTR( compar, "compar is not a valid function pointer!" ); + + CYG_ADDRESS current; + size_t lower = 0; + size_t upper = nmemb; + size_t index; + int result; + + if (nmemb == 0 || size == 0) + { + CYG_TRACE2( TL1, "Warning! either nmemb (%d) or size (%d) is 0", + nmemb, size ); + CYG_REPORT_RETVAL( NULL ); + return NULL; + } // if + + while (lower < upper) + { + index = (lower + upper) / 2; + current = (CYG_ADDRESS) (((char *) base) + (index * size)); + + CYG_TRACE2( TL1, "About to call comparison function with " + "key=%08x, current=%08x", key, current ); + result = compar (key, (void *) current); + CYG_TRACE1( TL1, "Comparison function returned %d", result ); + + if (result < 0) + upper = index; + else if (result > 0) + lower = index + 1; + else + { + CYG_REPORT_RETVAL( current ); + return (void *)current; + } // else + } // while + + CYG_REPORT_RETVAL( NULL ); + return NULL; +} // bsearch() + +// EOF bsearch.cxx
