[Tex/LaTex] Where I can find the source code of pdflatex.exe

pdftexsourcecode

Where I can find the source code of pdflatex.exe?

Edit 1

This is quoted from the link given by @TH.

pdfTeX is built on top of TeX, written by Donald Knuth cum suis (Liang and
so), and eTeX, written by Peter Breitenlohner cum suis; part of the
paragraph optimization is inspired by the work of Hermann Zapf.

Does it imply that the source code of pdflatex.exe will invoke TeX and eTeX ?

Best Answer

On CTAN. http://ctan.org/tex-archive/systems/pdftex/

Links to the source code repository can be found on tug.org.

Edit:
To answer your follow up question, pdflatex does not invoke tex or etex. Rather, pdfTeX implements the ε-TeX extensions.

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