a C standard library for fx Casio calculators
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README.md

The FX C Library

This directory contains the sources of the FxLibc Library. See the make version command to see for what release version you have.

The Fx C Library is the standard system C library implementation for all Casio Fx calculator, and is an important part of what makes up programs on these devices. It provides the system API for all programs written in C and C-compatible languages such as C++ and Objective-C; the runtime facilities of other programming languages use the C library to access the underlying operating system.


Dependencies

Fx C library depends on a suitable GCC toolchain in the PATH. You can absolutely not build fxlibc with your system compiler!

  • The tutorial on Planète Casio builds an sh-elf that works everywhere.
  • For fx-9860G II, sh3eb-elf is strongly advised.
  • For fx-CG 50, sh4eb-elf (with -m4-nofpu) is slightly better but sh3eb-elf is completely fine.

Building and installating FxLibc

You can choose to build fxlibc standalone or with the support of the fx-9860G II (monochrome calculators, aka Graph 85 family) Casio ABI, fx-CG 50 (color calculators, aka Prizm or Graph 90 family), Vhex kernel ABI or all of them (this will generate 3 distinct libraries).

Each ABI support add many functionalities provided by the operating system, like I/O abstraction (open, close, fcntl, stat, ...). (see “supported features” on the wiki)

Configuration and support

The Fx C library supports these ABI:

  • fx9860g for the support of Casio ABI used by fx9860g-like devices.
  • fxcg50 for the support of Casio ABI used by the fxcg50 device.
  • vhex for the support of Vhex kernel ABI.
  • (nothing) compile only standing functions.

The Fx C library support these format:

  • static generate static libraries.
  • dynamic generate dynamic libraries (Only for the Vhex kernel).

Note that the shared feature is not currently implemented because of non-support of the shared library generation by the GCC compiler for SuperH architecture. A workaround can be used but it requires a static library to do the dynamic symbols resolving (Thanks Kristaba).

For more information about library build configuration, you can use the ./configure --help command.

Building

Create a build directory and configure in it:

% mkdir build && cd build
% ../configure --static --support=vhex,fx9860g,fxcg50

Then build the source and install the library files to the selected directory. You might need root access if you selected a target directory owned by root with --prefix, or if you built your compiler as root.

% make
% make install

Contributing

Bug reports, feature suggestions and especially code contributions are most welcome.

If you are interested in doing a port, or want to contribute to this project, please, try to respect these constraints:

  • Document your code.
  • One function per files.
  • Each file name content only the name of the function.
  • Respect the Linux Coding style as much as possible (if you are not familiar with this norm, you can use indent -linux utility to help to format).
  • Header must respect the /usr/include architecture.
  • Avoid modules hardware-specific code which can generate interruptions (DMA, SPU, ...) except if you are absolutely sure that the operating system can handle them.

Using Fx C Library

To use Fx C library as your runtime environment, the bare minimum is:

  • You must add fxlibc/ instead of each include file (for example, if you want to include stdio.h you mush use #include <fxlibc/stdio.h>.
  • Link with:
    • -lfxlibc-fx9860g for Casio ABI support for monochrome devices
    • -lfxlibc-fxcg50 for Casio ABI support for primz devices
    • -lfxlibc-vhex for Vhex kernel support.
    • -lfxlibc for standalone features

Licences

This work is licensed under a CC0 1.0 Universal License. To view a copy of this license, visit: https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt Or see the LICENSE file.


Special thanks to

  • Lephenixnoir - For all <3
  • Kristaba - For the idea with the shared libraries workaround !