The c2hsc package

[ Tags: bsd3, development, program ] [ Propose Tags ]

Convert C API header files to .hsc and .hsc.helper.c files

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Versions 0.1.0, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.4.0, 0.5.0, 0.5.1, 0.6.2, 0.6.3, 0.6.4, 0.6.5
Dependencies base (==4.*), cmdargs (>=0.9), containers (>=0.4), directory (>=1.1), filepath (>=1.3), HStringTemplate (>=0.6), language-c (>=0.4), mtl (>=2.0), pretty (>=1.1), split (>=0.2), transformers (>=0.2) [details]
License BSD3
Author John Wiegley
Maintainer John Wiegley <>
Category Development
Home page
Source repository head: git clone
Uploaded Thu Apr 3 19:34:33 UTC 2014 by JohnWiegley
Distributions NixOS:0.6.5
Executables c2hsc
Downloads 3383 total (18 in the last 30 days)
Rating 0.0 (0 ratings) [clear rating]
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Status Docs not available [build log]
Last success reported on 2016-10-27 [all 10 reports]
Hackage Matrix CI


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Readme for c2hsc-0.6.5

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Converts C API header files to .hsc and .hsc.helper.c files

Usage: c2hsc --prefix=<Lib Prefix> <FILE>.h

This will create <FILE>.hsc, and <FILE>.hsc.helper.c if the header file contains inline functions.

For example, in hlibgit2 on the Mac I'm using:

c2hsc --prefix=Bindings.Libgit2 --cppopts=-U__BLOCKS__ \

Known issues:

  • Need to output vararg functions with a comment mentioning they are not translatable to the Haskell FFI

Also, please note that this tool will never be 100% accurate. It cannot translate macros, or anything related to the preprocessor, for example. It often misses necessary #include files, and will get them wrong in any case if preprocessor conditionals are involved.

The goal of c2hsc is to solve the hardest 80% of the problem of creating an FFI library. The remaining 20%, plus validation of the results, is an exercise necessarily left to the user.