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Updated README information

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git-svn-id: http://picoc.googlecode.com/svn/trunk@413 21eae674-98b7-11dd-bd71-f92a316d2d60
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README
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picoc picoc
----- -----
PicoC is a very small C interpreter. It's intended for use as a script PicoC is a very small C interpreter for scripting. It was originally written
language for embedded systems. It was originally written to be the for scripting a UAV's on-board flight system and it's also very suitable for
script language for a UAV on-board flight system and is very suitable other robotic, embedded and non-embedded applications too.
for other robotic, embedded and also non-embedded applications.
The core C source code is less than 3000 lines of code. When compiled The core C source code is around 3500 lines of code. It's not intended to be
it only takes a few k of code space and is also very sparing of data a complete implementation of ISO C but it has all the essentials. When
space. This means it can work well in small embedded devices. It's also compiled it only takes a few k of code space and is also very sparing of
a fun example of how to create a very small language implementation data space. This means it can work well in small embedded devices. It's also
while still keeping the code readable. a fun example of how to create a very small language implementation while
still keeping the code readable.
picoc is now feature frozen. Since it's important that it remain small it's
intended that no more major features will be added from now on. It's been
tested on x86-32, x86-64, powerpc, arm, ultrasparc, HP-PA and blackfin
processors and is easy to port to new targets.
Compiling picoc Compiling picoc
@ -28,17 +32,17 @@ Porting picoc
platform.h is where you select your platform type and specify the includes platform.h is where you select your platform type and specify the includes
etc. for your platform. etc. for your platform.
platform_support.c contains support functions so the compiler can work on platform_XXX.c contains support functions so the compiler can work on
your platform, such as how to write characters to the console etc.. your platform, such as how to write characters to the console etc..
platform_library.c contains your library of functions you want to make platform_library.c contains your library of functions you want to make
available to user programs. available to user programs.
There's also a new clibrary.c which contains user library functions like There's also a clibrary.c which contains user library functions like
printf() which are platform-independent. printf() which are platform-independent.
Porting the system will involve setting up suitable includes and defines Porting the system will involve setting up suitable includes and defines
in platform.h, writing some I/O routines in platform_support.c, putting in platform.h, writing some I/O routines in platform_XXX.c, putting
whatever user functions you want in platform_library.c and then changing whatever user functions you want in platform_library.c and then changing
the main program in picoc.c to whatever you need to do to get programs the main program in picoc.c to whatever you need to do to get programs
into the system. into the system.