Create C bindings for python automatically with the help of libclang

Overview

Python C Import

Dynamic library + header + ctypes = Module like object!

Create C bindings for python automatically with the help of libclang.

Examples

from c_import import loader
import ctypes

libc = loader.load("libc.so.6", ["stdio.h", "stdint.h", "math.h", "stdlib.h", "string.h", "time.h"])

# Work with file streams
filestream = libc.fopen(b"/tmp/x", b"rw+")
text = ctypes.create_string_buffer(b"Hello world")
libc.fwrite(text, len(text), 1, fstream)
libc.fflush(fstream)
libc.fclose(fstream)

libc.fileno(libc.stdin)
# 1

libc.fputc(ord('A'), libc.stdout)
libc.fflush(libc.stdout)
# A
libc.fprintf(libc.stderr, b"%d\n", 100) # 100

# Use math functions
libc.abs(-1)
# 1

# Create instances of structs
cal_date = libc.tm()
dir(cal_date)
# All fields are available
# [...,
#  'tm_gmtoff',
#  'tm_hour',
#  'tm_isdst',
#  'tm_mday',
#  'tm_min',
#  'tm_mon',
#  'tm_sec',
#  'tm_wday',
#  'tm_yday',
#  'tm_year',
#  'tm_zone']
cal_date.tm_sec = 1
cal_date.tm_year = 1999

# View the fields of "private" structs
# Great when experimenting inside an interactive shell.
dir(libc.stdout.contents)
# (Fields differ between libc implementations)
# [...,
#  '_IO_backup_base',
#  '_IO_buf_base',
#  '_IO_buf_end',
#  '_IO_read_base',
#  '_IO_read_end',
#  '_IO_read_ptr',
#  '_IO_save_base',
#  '_IO_save_end',
#  '_IO_write_base',
#  '_IO_write_end',
#  '_IO_write_ptr',
#  '__pad5',
#  '_chain',
#  '_codecvt',
#  '_cur_column',
#  '_fields_',
#  '_fileno',
#  '_flags',
#  '_flags2',
#  '_freeres_buf',
#  '_freeres_list',
#  '_lock',
#  '_markers',
#  '_mode',
#  '_objects',
#  '_offset',
#  '_old_offset',
#  '_shortbuf',
#  '_unused2',
#  '_vtable_offset',
#  '_wide_data']
libc.stdout.contents._fileno # 1

# Functions that return a struct work too
x = libc.div(49, 8)
x.quot # 6
x.rem  # 1
x.__class__.__name__ # 'div_t'

# Abort the process
libc.abort()

How does that work

The loader calls the c pre-processor to resolve any “include”s and “define”s.

The resulting header is processed by libclang

The header parser module converts the parsed header into ctype types.

The loader wraps symbols with their python ctype.

Features

Working

Basic C types

Functions

Pointers

Arrays

Structs

Unions

Enums

Typedefs

Globals

Bitfields

Forward declarations

Anonymous structs

Anonymous unions

Anonymous enums

Typedefs to anonymous types.

Nested anonymous types.

“Packed” attribute

Variadic arguments

Not implemented yet

Non cdecl functions (Important for Win32API)

Pre-processor constant integer expressions

Their declarations are not preserved after the pre-processing.

Vector types

I thought it was python, why am I seeing lisp?

Hy is sort of a python lisp hybrid. Its written like lisp, but its translated during runtime into python. It has interoperability with python, the fact that its written in hy is abstracted to the end user of the library.

https://docs.hylang.org/en/stable/whyhy.html

LICENSE

This library is licensed under GNU Lesser General Public License version 3 or later. See COPYING and COPYING.LESSER for further details.

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