From: https://www.quinapalus.com/qfplib.html
Qfplib is open source, licensed under version 2 of the GNU GPL. A copy of that licence is included in this archive. The archive also contains:
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qfplib.s, the source code to qfplib. The GNU assembler syntax is used.
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qfplib.h, a C header file giving prototypes for the qfplib functions.
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qfpio.s, the source code to qfpio, routines for converting between strings and floating-point values.
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qfpio.h, a C header file giving prototypes for the qfpio functions.
Visit http://www.quinapalus.com/qfplib.html for more information.