how does pycparser reads the header files listed in includes in C code files?

Question

I am trying to parse a C file using pycparser. I am curious to know that while pre-processing the C file does the pycparser reads only those library files which are provided in fake lib folder(if you provide the path of fake lib in cpp_args) or it also reads from the location mentioned in include statements, such as-
in line below

#include<folder1/folder2/xyz.h>  

where will the pycparser search for xyz.h will it only be in FAKE LIB folder?

Answer 1

It will search other directories than the fake folder. If you look in the file pycparser/__init__.py, you'll find a function called preprocess_file which invokes the C preprocessor on your input file and puts the resulting output in a string, which it then passes to the next function called parse_file. The code in each of these functions is fairly clear and well-commented, so give it a read and see if it makes sense.

The fake folder is included only for standard library headers like stdlib.h, stdio.h and so forth. Those headers often contain non-portable compiler-specific extensions; chances are, you'll only need to know that there's a function printf(...) in order to be able to parse your code.