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//===========================================================================
//
// bsearch.cxx
//
// ANSI standard binary search function defined in section 7.10.5.1
// of the standard
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####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
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