atof.cxx

ecos为实时嵌入式操作系统

//===========================================================================
//
//      atof.cxx
//
//      Real alternative for inline implementation of the ANSI standard
//      atof() utility function defined in section 7.10.1.1 of the standard
//
//===========================================================================
//####COPYRIGHTBEGIN####
//
// -------------------------------------------
// The contents of this file are subject to the Cygnus eCos Public License
// Version 1.0 (the "License"); you may not use this file except in
// compliance with the License.  You may obtain a copy of the License at
// http://sourceware.cygnus.com/ecos
// 
// 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 Cygnus Operating System, released
// September 30, 1998.
// 
// The Initial Developer of the Original Code is Cygnus.  Portions created
// by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions.  All Rights Reserved.
// -------------------------------------------
//
//####COPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):   jlarmour
// Contributors:  jlarmour
// Date:        1998-02-13
// Purpose:     
// Description: 
// Usage:       
//
//####DESCRIPTIONEND####
//
//===========================================================================

// CONFIGURATION

#include <pkgconf/libc.h>           // Configuration header

// Include the C library? And strtod() which we use?
#if defined(CYGPKG_LIBC) && defined(CYGFUN_LIBC_strtod)

// 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

// We don't want the inline versions of stdlib functions defined here

#ifdef CYGIMP_LIBC_STDLIB_INLINES
#undef CYGIMP_LIBC_STDLIB_INLINES
#endif

#include <stddef.h>                 // NULL, wchar_t and size_t from compiler
#include <stdlib.h>                 // Main header for stdlib functions
#include "clibincl/stdlibsupp.hxx"  // Support for stdlib functions


// EXPORTED SYMBOLS

externC double
atof( const char * ) CYGPRI_LIBC_WEAK_ALIAS("_atof");


// FUNCTIONS

double
_atof( const char *nptr )
{
    double retval;

    CYG_REPORT_FUNCNAMETYPE( "_atof", "returning %f" );

    CYG_CHECK_DATA_PTR( nptr, "nptr is an invalid pointer!" );
    
    retval = _strtod( nptr, (char **)NULL );

    CYG_REPORT_RETVAL( retval );

    return retval;
} // _atof()


#endif // if defined(CYGPKG_LIBC) && defined(CYGFUN_LIBC_strtod)

// EOF atof.cxx