[Feature] Configuration for alias for variadic C function

[Sunbreak]

Background

According to dart-lang/sdk#38578 (comment), we have to manually declare several common functions as alias for variadic C function.

Every time re-generating the open2, we have to manully edit the generated _dylib.lookupFunction<>('open2')) to _dylib.lookupFunction<>('open'))

https://github.com/Sunbreak/logic_conf.dart/blob/a2b18a947fec46859ad09fcd44050a305c14909d/linux/libc.h#L10

// FIMXE https://github.com/dart-lang/sdk/issues/38578
// Need manully change name from `open2` to `open` after `ffigen`
extern int open2 (const char *__file, int __oflag) __nonnull ((1));

https://github.com/Sunbreak/logic_conf.dart/blob/a2b18a947fec46859ad09fcd44050a305c14909d/lib/src/linux/libc.dart#L14-L22

  int open2(
    ffi.Pointer<ffi.Int8> __file,
    int __oflag,
  ) {
    return (_open2 ??= _dylib.lookupFunction<_c_open2, _dart_open2>('open'))(
      __file,
      __oflag,
    );
  }

Feature Request

Could we have some config for variadic alias?

functions:
  remap:
    'open2': 'open'
    'open3': 'open'
    'open4': 'open'

[mannprerak2]

I see 2 workarounds for generating variadic functions -

1. The user defines some functions in a new header file and remap its name (as Suggested by @Sunbreak above)
2. Alternatively we could let users add part 'file.dart' to the generated file, so they can manually extend the generated file and append new functions to the generated class by hand.

cc @dcharkes

[Sunbreak]

Any update?

[mannprerak2]

Completed via dart-archive/ffigen#515. See: https://github.com/dart-lang/ffigen#:~:text=functions%20%2D%3E%20variadic%2Darguments