fpio

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Conversion of floating point numbers between binary and decimal representation.

Introduction

The fpio library contains a routines for converting floating-point numbers between IEEE binary representation and decimal string representation. It is based on the gdtoa library by David Gay.

There are two routines included with the library, string->fp and fp->string.

Library procedures

fp->string:procedure: Converts the given floating-point number to decimal string representation. If optional argument NDIGITS is positive, the conversion is done to the specified number of decimal places. If NDIGITS is zero (the default) or negative, the conversion is done to the shortest decimal string that rounds to the given floating point value.

string->fp:procedure

Converts the given decimal string number to binary IEEE floating point representation. Optional argument ROUNDING is a symbol that can be one of:

toward-zero: indicates rounding-towards-zero mode (the default)
nearest: indicates rounding-towards-nearest mode
toward+Inf: indicates rounding-towards +Inf mode
toward-Inf: indicates rounding-towards -Inf mode

Authors

Ivan Raikov

Version

1.5: Use -fPIC flag to compile [thanks to Panos Stergiotis]
1.4: Added import of foreign library [thanks to felix]
1.3: Ported to Chicken 4
1.2: Fixes to the file manifest
1.0: Initial version

License

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.

- Neither name of the copyright holders nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.

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