u_strstr

// icuuc.dll
#include <windows.h>

WORD* u_strstr(
    const WORD* s,
    const WORD* substring
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function u_strstr(
    ByRef s As UShort,   ' WORD*
    ByRef substring As UShort   ' WORD*
) As IntPtr
End Function

' s : WORD*
' substring : WORD*
Declare PtrSafe Function u_strstr Lib "icuuc" ( _
    ByRef s As Integer, _
    ByRef substring As Integer) As LongPtr
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

u_strstr = ctypes.cdll.icuuc.u_strstr
u_strstr.restype = ctypes.c_void_p
u_strstr.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # s : WORD*
    ctypes.POINTER(ctypes.c_ushort),  # substring : WORD*
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
u_strstr = Fiddle::Function.new(
  lib['u_strstr'],
  [
    Fiddle::TYPE_VOIDP,  # s : WORD*
    Fiddle::TYPE_VOIDP,  # substring : WORD*
  ],
  Fiddle::TYPE_VOIDP, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn u_strstr(
        s: *const u16,  // WORD*
        substring: *const u16  // WORD*
    ) -> *mut u16;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr u_strstr(ref ushort s, ref ushort substring);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_u_strstr' -Namespace Win32 -PassThru
# $api::u_strstr(s, substring)

#uselib "icuuc.dll"
#func global u_strstr "u_strstr" sptr, sptr
; u_strstr varptr(s), varptr(substring)   ; 戻り値は stat
; s : WORD* -> "sptr"
; substring : WORD* -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procu_strstr = icuuc.NewProc("u_strstr")
)

// s (WORD*), substring (WORD*)
r1, _, err := procu_strstr.Call(
	uintptr(s),
	uintptr(substring),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // WORD*

function u_strstr(
  s: Pointer;   // WORD*
  substring: Pointer   // WORD*
): Pointer; cdecl;
  external 'icuuc.dll' name 'u_strstr';

result := DllCall("icuuc\u_strstr"
    , "Ptr", s   ; WORD*
    , "Ptr", substring   ; WORD*
    , "Cdecl Ptr")   ; return: WORD*

●u_strstr(s, substring) = DLL("icuuc.dll", "void* u_strstr(void*, void*)")
# 呼び出し: u_strstr(s, substring)
# s : WORD* -> "void*"
# substring : WORD* -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。
# ※cdecl関数。DLL()宣言はstdcall前提。cdeclは EXEC_PTR(`cdecl`,…) を使用。

const std = @import("std");

extern "icuuc" fn u_strstr(
    s: [*c]u16, // WORD*
    substring: [*c]u16 // WORD*
) callconv(.c) [*c]u16;

proc u_strstr(
    s: ptr uint16,  # WORD*
    substring: ptr uint16  # WORD*
): ptr uint16 {.importc: "u_strstr", cdecl, dynlib: "icuuc.dll".}

pragma(lib, "icuuc");
extern(C)
ushort* u_strstr(
    ushort* s,   // WORD*
    ushort* substring   // WORD*
);

ccall((:u_strstr, "icuuc.dll"), Ptr{UInt16},
      (Ptr{UInt16}, Ptr{UInt16}),
      s, substring)
# s : WORD* -> Ptr{UInt16}
# substring : WORD* -> Ptr{UInt16}

local ffi = require("ffi")
ffi.cdef[[
uint16_t* u_strstr(
    uint16_t* s,
    uint16_t* substring);
]]
local icuuc = ffi.load("icuuc")
-- icuuc.u_strstr(s, substring)
-- s : WORD*
-- substring : WORD*
-- 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

const koffi = require('koffi');
const lib = koffi.load('icuuc.dll');
const u_strstr = lib.func('__cdecl', 'u_strstr', 'uint16_t *', ['uint16_t *', 'uint16_t *']);
// u_strstr(s, substring)
// s : WORD* -> 'uint16_t *'
// substring : WORD* -> 'uint16_t *'
// 出力ポインタは koffi.out(...) で包む。構造体は koffi.struct で定義。

const lib = Deno.dlopen("icuuc.dll", {
  u_strstr: { parameters: ["pointer", "pointer"], result: "pointer" },
});
// lib.symbols.u_strstr(s, substring)
// s : WORD* -> "pointer"
// substring : WORD* -> "pointer"
// 文字列引数は "buffer"(NUL 終端のバイト列を Uint8Array で渡す)。
// 値渡し構造体は { struct: [ ...field types... ] } を使用。

<?php
$ffi = FFI::cdef(<<<C
uint16_t* u_strstr(
    uint16_t* s,
    uint16_t* substring);
C, "icuuc.dll");
// $ffi->u_strstr(s, substring);
// s : WORD*
// substring : WORD*
// 構造体/GUIDへのポインタは cdef が通るよう void* で表記(実型は各引数コメント参照)。値渡し構造体・enum は対応する typedef を cdef に追加すること。

import com.sun.jna.*;
import com.sun.jna.ptr.*;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIOptions;

public interface Icuuc extends Library {
    Icuuc INSTANCE = Native.load("icuuc", Icuuc.class);
    Pointer u_strstr(
        ShortByReference s,   // WORD*
        ShortByReference substring   // WORD*
    );
}

@[Link("icuuc")]
lib Libicuuc
  fun u_strstr = u_strstr(
    s : UInt16*,   # WORD*
    substring : UInt16*   # WORD*
  ) : UInt16*
end
# 構造体/GUID/enum は lib 内に対応する型定義が必要。

import 'dart:ffi';
import 'package:ffi/ffi.dart';

typedef u_strstrNative = Pointer<Uint16> Function(Pointer<Uint16>, Pointer<Uint16>);
typedef u_strstrDart = Pointer<Uint16> Function(Pointer<Uint16>, Pointer<Uint16>);
final u_strstr = DynamicLibrary.open('icuuc.dll')
    .lookupFunction<u_strstrNative, u_strstrDart>('u_strstr');
// s : WORD* -> Pointer<Uint16>
// substring : WORD* -> Pointer<Uint16>
// 文字列は package:ffi の "...".toNativeUtf16()/toNativeUtf8() で変換。

{$mode objfpc}{$H+}
function u_strstr(
  s: Pointer;   // WORD*
  substring: Pointer   // WORD*
): Pointer; cdecl;
  external 'icuuc.dll' name 'u_strstr';

import Foreign
import Foreign.C.Types
import Foreign.C.String

foreign import ccall safe "u_strstr"
  c_u_strstr :: Ptr Word16 -> Ptr Word16 -> IO (Ptr Word16)
-- s : WORD* -> Ptr Word16
-- substring : WORD* -> Ptr Word16
-- 要 GHC(Windows)。stdcall は x64 では ccall として扱われる。ブロックする API は safe 呼び出し推奨。

open Ctypes
open Foreign

let u_strstr =
  foreign "u_strstr"
    ((ptr uint16_t) @-> (ptr uint16_t) @-> returning (ptr uint16_t))
(* s : WORD* -> (ptr uint16_t) *)
(* substring : WORD* -> (ptr uint16_t) *)
(* foreign は cdecl 前提。x64 Windows では WINAPI と一致。構造体は ctypes structure を定義のこと。 *)

(cffi:define-foreign-library icuuc (t "icuuc.dll"))
(cffi:use-foreign-library icuuc)

(cffi:defcfun ("u_strstr" u-strstr :convention :cdecl) :pointer
  (s :pointer)   ; WORD*
  (substring :pointer))   ; WORD*
; isize/usize(INT_PTR/SIZE_T)は x64 前提で :int64/:uint64。x86 では :int32/:uint32。

use Win32::API;
my $u_strstr = Win32::API::More->new('icuuc',
    'LPVOID u_strstr(LPVOID s, LPVOID substring)');
# my $ret = $u_strstr->Call($s, $substring);
# s : WORD* -> LPVOID
# substring : WORD* -> LPVOID
# 値渡し構造体は pack() した文字列、または Win32::API::Struct を使用。