sbourdelin / s-expr

A basic s-expression parser and printer in C

S-Expression parser and printer

This program is heavely inspired by https://github.com/benthepoet/c-sexpr-parser/ and rework some logic to fit our needs and add a nested fashion printing option.

The dataset used for the unit test is stored in the dataset/exemple.sexp path.

How to build

To build the program please use the Makefile provided by invoking the make command:

make

The Makefile support the cross-compilation, to build the program for an other architecture please fill the $CROSS_COMPILATION environment variable with the prefix of your toolchain (e.g: arm-linux-gnueabihf- only, if you are using the arm-linux-gnueabihf GCC, LD, etc. Your toolchain should be available in your $PATH:

CROSS_COMPILATION=arm-linux-gnueabihf- && make

How to use

This program comes with some options, please at least use the -p for printing or -t for testing the dataset respectively:

./sexpr -h
Usage : sexpr [options]
Options:
        -h      print this help message
        -p      print the output of the sexpression dataset in a nested fashion format
        -t      run test on the dataset, only work with the default dataset (exemple.sexp)
        -d      specify the dataset path to use

Full cross-compile exemple for ARM with Qemu

First you need to install qemu-arm, it depends on your Linux distribution.

Then download an arm toolchain, i'm using the bootlin toolchain for armv6 available here: https://toolchains.bootlin.com/downloads/releases/toolchains/armv6-eabihf/tarballs/armv6-eabihf--glibc--stable-2020.08-1.tar.bz2

Extract the toolchain, then before compiling the project, do the following:

ARCH=arm
PATH=/path_to_your_extracted_toolchain/armv6-eabihf--glibc--stable-2020.08-1/bin/:$PATH
CROSS_COMPILE=arm-linux-
LD_LIBRARY_PATH=/path_to_your_extracted_toolchain/armv6-eabihf--glibc--stable-2020.08-1/arm-buildroot-linux-gnueabihf/sysroot/

You can now invoked the program with the following command:

qemu-arm -L $LD_LIBRARY_PATH ./sexpr