all: replace target=wasi with target=wasip1

This eliminates the 'wasi' build tag in favor of 'GOOS=wasip1', introduced in Go 1.21.

For backwards compatablity, -target=wasi is a synonym for -target=wasip1.

src/os/dir_wasi.go

@@ -1,114 +0,0 @@
-// Copyright 2009 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.
-
-// This file was derived from src/os/dir_darwin.go since the logic for wasi is
-// fairly similar: we use fdopendir, fdclosedir, and readdir from wasi-libc in
-// a similar way that the darwin code uses functions from libc.
-
-//go:build wasi || wasip1
-
-package os
-
-import (
-	"io"
-	"runtime"
-	"syscall"
-	"unsafe"
-)
-
-// opaque DIR* returned by fdopendir
-//
-// We add an unused field so it is not the empty struct, which is usually
-// a special case in Go.
-type dirInfo struct{ _ int32 }
-
-func (d *dirInfo) close() {
-	syscall.Fdclosedir(uintptr(unsafe.Pointer(d)))
-}
-
-func (f *File) readdir(n int, mode readdirMode) (names []string, dirents []DirEntry, infos []FileInfo, err error) {
-	if f.dirinfo == nil {
-		dir, errno := syscall.Fdopendir(syscallFd(f.handle.(unixFileHandle)))
-		if errno != nil {
-			return nil, nil, nil, &PathError{Op: "fdopendir", Path: f.name, Err: errno}
-		}
-		f.dirinfo = (*dirInfo)(unsafe.Pointer(dir))
-	}
-	d := uintptr(unsafe.Pointer(f.dirinfo))
-
-	// see src/os/dir_unix.go
-	if n == 0 {
-		n = -1
-	}
-
-	for n != 0 {
-		dirent, errno := syscall.Readdir(d)
-		if errno != nil {
-			if errno == syscall.EINTR {
-				continue
-			}
-			return names, dirents, infos, &PathError{Op: "readdir", Path: f.name, Err: errno}
-		}
-		if dirent == nil { // EOF
-			break
-		}
-		name := dirent.Name()
-		// Check for useless names before allocating a string.
-		if string(name) == "." || string(name) == ".." {
-			continue
-		}
-		if n > 0 {
-			n--
-		}
-		if mode == readdirName {
-			names = append(names, string(name))
-		} else if mode == readdirDirEntry {
-			de, err := newUnixDirent(f.name, string(name), dtToType(dirent.Type))
-			if IsNotExist(err) {
-				// File disappeared between readdir and stat.
-				// Treat as if it didn't exist.
-				continue
-			}
-			if err != nil {
-				return nil, dirents, nil, err
-			}
-			dirents = append(dirents, de)
-		} else {
-			info, err := lstat(f.name + "/" + string(name))
-			if IsNotExist(err) {
-				// File disappeared between readdir + stat.
-				// Treat as if it didn't exist.
-				continue
-			}
-			if err != nil {
-				return nil, nil, infos, err
-			}
-			infos = append(infos, info)
-		}
-		runtime.KeepAlive(f)
-	}
-
-	if n > 0 && len(names)+len(dirents)+len(infos) == 0 {
-		return nil, nil, nil, io.EOF
-	}
-	return names, dirents, infos, nil
-}
-
-func dtToType(typ uint8) FileMode {
-	switch typ {
-	case syscall.DT_BLK:
-		return ModeDevice
-	case syscall.DT_CHR:
-		return ModeDevice | ModeCharDevice
-	case syscall.DT_DIR:
-		return ModeDir
-	case syscall.DT_FIFO:
-		return ModeNamedPipe
-	case syscall.DT_LNK:
-		return ModeSymlink
-	case syscall.DT_REG:
-		return 0
-	}
-	return ^FileMode(0)
-}