The first step is to read and understand the source code of the concerned project. The time taken to understand the source code depends upon the size and complexity of the project.
The easiest way to understand the source code is to run the test files offered by the developers. If unfortunately the test files are not available, then you have to setup the developing environment and debug the source code. Keep in touch with the developer community all the time.
Use IDE's like Eclipse or Code::Blocks for reading the source code for moderately sized projects, or use Emacs and VI in conjunction with extensions like autocomplete, ctags and cscope(for code assistance), for large and complex projects since the IDE's are memory hunger.
The easiest way to understand the source code is to run the test files offered by the developers. If unfortunately the test files are not available, then you have to setup the developing environment and debug the source code. Keep in touch with the developer community all the time.
Use IDE's like Eclipse or Code::Blocks for reading the source code for moderately sized projects, or use Emacs and VI in conjunction with extensions like autocomplete, ctags and cscope(for code assistance), for large and complex projects since the IDE's are memory hunger.
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