u_strncmp

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

INT u_strncmp(
    const WORD* ucs1,
    const WORD* ucs2,
    INT n
);

<DllImport("icuuc.dll", ExactSpelling:=True, CallingConvention:=CallingConvention.Cdecl)>
Public Shared Function u_strncmp(
    ByRef ucs1 As UShort,   ' WORD*
    ByRef ucs2 As UShort,   ' WORD*
    n As Integer   ' INT
) As Integer
End Function

' ucs1 : WORD*
' ucs2 : WORD*
' n : INT
Declare PtrSafe Function u_strncmp Lib "icuuc" ( _
    ByRef ucs1 As Integer, _
    ByRef ucs2 As Integer, _
    ByVal n As Long) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

u_strncmp = ctypes.cdll.icuuc.u_strncmp
u_strncmp.restype = ctypes.c_int
u_strncmp.argtypes = [
    ctypes.POINTER(ctypes.c_ushort),  # ucs1 : WORD*
    ctypes.POINTER(ctypes.c_ushort),  # ucs2 : WORD*
    ctypes.c_int,  # n : INT
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('icuuc.dll')
u_strncmp = Fiddle::Function.new(
  lib['u_strncmp'],
  [
    Fiddle::TYPE_VOIDP,  # ucs1 : WORD*
    Fiddle::TYPE_VOIDP,  # ucs2 : WORD*
    Fiddle::TYPE_INT,  # n : INT
  ],
  Fiddle::TYPE_INT, Fiddle::Function::CDECL)

#[link(name = "icuuc")]
extern "C" {
    fn u_strncmp(
        ucs1: *const u16,  // WORD*
        ucs2: *const u16,  // WORD*
        n: i32  // INT
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("icuuc.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern int u_strncmp(ref ushort ucs1, ref ushort ucs2, int n);
"@
$api = Add-Type -MemberDefinition $sig -Name 'icuuc_u_strncmp' -Namespace Win32 -PassThru
# $api::u_strncmp(ucs1, ucs2, n)

#uselib "icuuc.dll"
#func global u_strncmp "u_strncmp" sptr, sptr, sptr
; u_strncmp varptr(ucs1), varptr(ucs2), n   ; 戻り値は stat
; ucs1 : WORD* -> "sptr"
; ucs2 : WORD* -> "sptr"
; n : INT -> "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。

#uselib "icuuc.dll"
#cfunc global u_strncmp "u_strncmp" var, var, int
; res = u_strncmp(ucs1, ucs2, n)
; ucs1 : WORD* -> "var"
; ucs2 : WORD* -> "var"
; n : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; INT u_strncmp(WORD* ucs1, WORD* ucs2, INT n)
#uselib "icuuc.dll"
#cfunc global u_strncmp "u_strncmp" var, var, int
; res = u_strncmp(ucs1, ucs2, n)
; ucs1 : WORD* -> "var"
; ucs2 : WORD* -> "var"
; n : INT -> "int"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

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

var (
	icuuc = windows.NewLazySystemDLL("icuuc.dll")
	procu_strncmp = icuuc.NewProc("u_strncmp")
)

// ucs1 (WORD*), ucs2 (WORD*), n (INT)
r1, _, err := procu_strncmp.Call(
	uintptr(ucs1),
	uintptr(ucs2),
	uintptr(n),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // INT

function u_strncmp(
  ucs1: Pointer;   // WORD*
  ucs2: Pointer;   // WORD*
  n: Integer   // INT
): Integer; cdecl;
  external 'icuuc.dll' name 'u_strncmp';

result := DllCall("icuuc\u_strncmp"
    , "Ptr", ucs1   ; WORD*
    , "Ptr", ucs2   ; WORD*
    , "Int", n   ; INT
    , "Cdecl Int")   ; return: INT

●u_strncmp(ucs1, ucs2, n) = DLL("icuuc.dll", "int u_strncmp(void*, void*, int)")
# 呼び出し: u_strncmp(ucs1, ucs2, n)
# ucs1 : WORD* -> "void*"
# ucs2 : WORD* -> "void*"
# n : INT -> "int"
# 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。