You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: syscall_darwin.1_12.go
    path of file: ./repos/pigo/vendor/golang.org/x/sys/unix
    
    the code of the file until where you have to start completion: // Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build darwin,go1.12,!go1.13

package unix

import (
	"unsafe"
)

func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
	// To implement this using libSystem we'd need syscall_syscallPtr for
	// f
    
func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
	// To implement this using libSystem we'd need syscall_syscallPtr for
	// fdopendir. However, syscallPtr was only added in Go 1.13, so we fall
	// back to raw syscalls for this func on Go 1.12.
	var p unsafe.Pointer
	if len(buf) > 0 {
		p = unsafe.Pointer(&buf[0])
	} else {
		p = unsafe.Pointer(&_zero)
	}
	r0, _, e1 := Syscall6(SYS_GETDIRENTRIES64, uintptr(fd), uintptr(p), uintptr(len(buf)), uintptr(unsafe.Pointer(basep)), 0, 0)
	n = int(r0)
	if e1 != 0 {
		return n, errnoErr(e1)
	}
	return n, nil
}