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Merge pull request #496 from xushiwei/q

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c/syscall/unix: remove deps of syscall
This commit is contained in:
xushiwei
2024-07-12 01:33:54 +08:00
committed by GitHub
parent c7a078f17f 2d29d1549a
commit 4bba3bf1d2
10 changed files with 0 additions and 851 deletions
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6
c/syscall/unix/at_sysnum_dragonfly.go
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@@ -4,12 +4,6 @@
package unix package unix
import "syscall"
const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
const openatTrap uintptr = syscall.SYS_OPENAT
const fstatatTrap uintptr = syscall.SYS_FSTATAT
const AT_REMOVEDIR = 0x2 const AT_REMOVEDIR = 0x2
const AT_SYMLINK_NOFOLLOW = 0x1 const AT_SYMLINK_NOFOLLOW = 0x1

6
c/syscall/unix/at_sysnum_freebsd.go
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@@ -4,15 +4,9 @@
package unix package unix
import "syscall"
const ( const (
AT_REMOVEDIR = 0x800 AT_REMOVEDIR = 0x800
AT_SYMLINK_NOFOLLOW = 0x200 AT_SYMLINK_NOFOLLOW = 0x200
UTIME_OMIT = -0x2 UTIME_OMIT = -0x2
unlinkatTrap uintptr = syscall.SYS_UNLINKAT
openatTrap uintptr = syscall.SYS_OPENAT
posixFallocateTrap uintptr = syscall.SYS_POSIX_FALLOCATE
) )

11
c/syscall/unix/at_sysnum_fstatat64_linux.go
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@@ -1,11 +0,0 @@
// Copyright 2018 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.
//go:build arm || mips || mipsle || 386
package unix
import "syscall"
const fstatatTrap uintptr = syscall.SYS_FSTATAT64

11
c/syscall/unix/at_sysnum_fstatat_linux.go
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@@ -1,11 +0,0 @@
// Copyright 2018 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.
//go:build arm64 || riscv64
package unix
import "syscall"
const fstatatTrap uintptr = syscall.SYS_FSTATAT

5
c/syscall/unix/at_sysnum_linux.go
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@@ -4,11 +4,6 @@
package unix package unix
import "syscall"
const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
const openatTrap uintptr = syscall.SYS_OPENAT
const ( const (
AT_EACCESS = 0x200 AT_EACCESS = 0x200
AT_FDCWD = -0x64 AT_FDCWD = -0x64

6
c/syscall/unix/at_sysnum_netbsd.go
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@@ -4,12 +4,6 @@
package unix package unix
import "syscall"
const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
const openatTrap uintptr = syscall.SYS_OPENAT
const fstatatTrap uintptr = syscall.SYS_FSTATAT
const AT_REMOVEDIR = 0x800 const AT_REMOVEDIR = 0x800
const AT_SYMLINK_NOFOLLOW = 0x200 const AT_SYMLINK_NOFOLLOW = 0x200

11
c/syscall/unix/at_sysnum_newfstatat_linux.go
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@@ -1,11 +0,0 @@
// Copyright 2018 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.
//go:build amd64 || mips64 || mips64le || ppc64 || ppc64le || s390x
package unix
import "syscall"
const fstatatTrap uintptr = syscall.SYS_NEWFSTATAT

6
c/syscall/unix/at_sysnum_openbsd.go
View File

@@ -4,12 +4,6 @@
package unix package unix
import "syscall"
const unlinkatTrap uintptr = syscall.SYS_UNLINKAT
const openatTrap uintptr = syscall.SYS_OPENAT
const fstatatTrap uintptr = syscall.SYS_FSTATAT
const AT_REMOVEDIR = 0x08 const AT_REMOVEDIR = 0x08
const AT_SYMLINK_NOFOLLOW = 0x02 const AT_SYMLINK_NOFOLLOW = 0x02

62
internal/lib/_io/fs/fs.go
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@@ -1,62 +0,0 @@
/*
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package fs
// llgo:skipall
import (
_ "unsafe"
"github.com/goplus/llgo/internal/lib/syscall"
)
var (
ErrInvalid = syscall.ErrInvalid
ErrPermission = syscall.ErrPermission
ErrExist = syscall.ErrExist
ErrNotExist = syscall.ErrNotExist
ErrClosed = syscall.ErrClosed
)
// -----------------------------------------------------------------------------
// A FileMode represents a file's mode and permission bits.
// The bits have the same definition on all systems, so that
// information about files can be moved from one system
// to another portably. Not all bits apply to all systems.
// The only required bit is [ModeDir] for directories.
type FileMode uint32
// -----------------------------------------------------------------------------
// PathError records an error and the operation and file path that caused it.
type PathError struct {
Op string
Path string
Err error
}
func (e *PathError) Error() string { return e.Op + " " + e.Path + ": " + e.Err.Error() }
func (e *PathError) Unwrap() error { return e.Err }
// Timeout reports whether this error represents a timeout.
func (e *PathError) Timeout() bool {
t, ok := e.Err.(interface{ Timeout() bool })
return ok && t.Timeout()
}
// -----------------------------------------------------------------------------

727
internal/lib/_io/io.go
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@@ -1,727 +0,0 @@
/*
* Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io
// llgo:skipall
import (
"errors"
)
// Seek whence values.
const (
SeekStart = 0 // seek relative to the origin of the file
SeekCurrent = 1 // seek relative to the current offset
SeekEnd = 2 // seek relative to the end
)
// ErrShortWrite means that a write accepted fewer bytes than requested
// but failed to return an explicit error.
var ErrShortWrite = errors.New("short write")
// errInvalidWrite means that a write returned an impossible count.
var errInvalidWrite = errors.New("invalid write result")
// ErrShortBuffer means that a read required a longer buffer than was provided.
var ErrShortBuffer = errors.New("short buffer")
// EOF is the error returned by Read when no more input is available.
// (Read must return EOF itself, not an error wrapping EOF,
// because callers will test for EOF using ==.)
// Functions should return EOF only to signal a graceful end of input.
// If the EOF occurs unexpectedly in a structured data stream,
// the appropriate error is either ErrUnexpectedEOF or some other error
// giving more detail.
var EOF = errors.New("EOF")
// ErrUnexpectedEOF means that EOF was encountered in the
// middle of reading a fixed-size block or data structure.
var ErrUnexpectedEOF = errors.New("unexpected EOF")
// ErrNoProgress is returned by some clients of a Reader when
// many calls to Read have failed to return any data or error,
// usually the sign of a broken Reader implementation.
var ErrNoProgress = errors.New("multiple Read calls return no data or error")
// Reader is the interface that wraps the basic Read method.
//
// Read reads up to len(p) bytes into p. It returns the number of bytes
// read (0 <= n <= len(p)) and any error encountered. Even if Read
// returns n < len(p), it may use all of p as scratch space during the call.
// If some data is available but not len(p) bytes, Read conventionally
// returns what is available instead of waiting for more.
//
// When Read encounters an error or end-of-file condition after
// successfully reading n > 0 bytes, it returns the number of
// bytes read. It may return the (non-nil) error from the same call
// or return the error (and n == 0) from a subsequent call.
// An instance of this general case is that a Reader returning
// a non-zero number of bytes at the end of the input stream may
// return either err == EOF or err == nil. The next Read should
// return 0, EOF.
//
// Callers should always process the n > 0 bytes returned before
// considering the error err. Doing so correctly handles I/O errors
// that happen after reading some bytes and also both of the
// allowed EOF behaviors.
//
// If len(p) == 0, Read should always return n == 0. It may return a
// non-nil error if some error condition is known, such as EOF.
//
// Implementations of Read are discouraged from returning a
// zero byte count with a nil error, except when len(p) == 0.
// Callers should treat a return of 0 and nil as indicating that
// nothing happened; in particular it does not indicate EOF.
//
// Implementations must not retain p.
type Reader interface {
Read(p []byte) (n int, err error)
}
// Writer is the interface that wraps the basic Write method.
//
// Write writes len(p) bytes from p to the underlying data stream.
// It returns the number of bytes written from p (0 <= n <= len(p))
// and any error encountered that caused the write to stop early.
// Write must return a non-nil error if it returns n < len(p).
// Write must not modify the slice data, even temporarily.
//
// Implementations must not retain p.
type Writer interface {
Write(p []byte) (n int, err error)
}
// Closer is the interface that wraps the basic Close method.
//
// The behavior of Close after the first call is undefined.
// Specific implementations may document their own behavior.
type Closer interface {
Close() error
}
// Seeker is the interface that wraps the basic Seek method.
//
// Seek sets the offset for the next Read or Write to offset,
// interpreted according to whence:
// SeekStart means relative to the start of the file,
// SeekCurrent means relative to the current offset, and
// SeekEnd means relative to the end
// (for example, offset = -2 specifies the penultimate byte of the file).
// Seek returns the new offset relative to the start of the
// file or an error, if any.
//
// Seeking to an offset before the start of the file is an error.
// Seeking to any positive offset may be allowed, but if the new offset exceeds
// the size of the underlying object the behavior of subsequent I/O operations
// is implementation-dependent.
type Seeker interface {
Seek(offset int64, whence int) (int64, error)
}
// ReadWriter is the interface that groups the basic Read and Write methods.
type ReadWriter interface {
Reader
Writer
}
// ReadCloser is the interface that groups the basic Read and Close methods.
type ReadCloser interface {
Reader
Closer
}
// WriteCloser is the interface that groups the basic Write and Close methods.
type WriteCloser interface {
Writer
Closer
}
// ReadWriteCloser is the interface that groups the basic Read, Write and Close methods.
type ReadWriteCloser interface {
Reader
Writer
Closer
}
// ReadSeeker is the interface that groups the basic Read and Seek methods.
type ReadSeeker interface {
Reader
Seeker
}
// ReadSeekCloser is the interface that groups the basic Read, Seek and Close
// methods.
type ReadSeekCloser interface {
Reader
Seeker
Closer
}
// WriteSeeker is the interface that groups the basic Write and Seek methods.
type WriteSeeker interface {
Writer
Seeker
}
// ReadWriteSeeker is the interface that groups the basic Read, Write and Seek methods.
type ReadWriteSeeker interface {
Reader
Writer
Seeker
}
// ReaderFrom is the interface that wraps the ReadFrom method.
//
// ReadFrom reads data from r until EOF or error.
// The return value n is the number of bytes read.
// Any error except EOF encountered during the read is also returned.
//
// The Copy function uses ReaderFrom if available.
type ReaderFrom interface {
ReadFrom(r Reader) (n int64, err error)
}
// WriterTo is the interface that wraps the WriteTo method.
//
// WriteTo writes data to w until there's no more data to write or
// when an error occurs. The return value n is the number of bytes
// written. Any error encountered during the write is also returned.
//
// The Copy function uses WriterTo if available.
type WriterTo interface {
WriteTo(w Writer) (n int64, err error)
}
// ReaderAt is the interface that wraps the basic ReadAt method.
//
// ReadAt reads len(p) bytes into p starting at offset off in the
// underlying input source. It returns the number of bytes
// read (0 <= n <= len(p)) and any error encountered.
//
// When ReadAt returns n < len(p), it returns a non-nil error
// explaining why more bytes were not returned. In this respect,
// ReadAt is stricter than Read.
//
// Even if ReadAt returns n < len(p), it may use all of p as scratch
// space during the call. If some data is available but not len(p) bytes,
// ReadAt blocks until either all the data is available or an error occurs.
// In this respect ReadAt is different from Read.
//
// If the n = len(p) bytes returned by ReadAt are at the end of the
// input source, ReadAt may return either err == EOF or err == nil.
//
// If ReadAt is reading from an input source with a seek offset,
// ReadAt should not affect nor be affected by the underlying
// seek offset.
//
// Clients of ReadAt can execute parallel ReadAt calls on the
// same input source.
//
// Implementations must not retain p.
type ReaderAt interface {
ReadAt(p []byte, off int64) (n int, err error)
}
// WriterAt is the interface that wraps the basic WriteAt method.
//
// WriteAt writes len(p) bytes from p to the underlying data stream
// at offset off. It returns the number of bytes written from p (0 <= n <= len(p))
// and any error encountered that caused the write to stop early.
// WriteAt must return a non-nil error if it returns n < len(p).
//
// If WriteAt is writing to a destination with a seek offset,
// WriteAt should not affect nor be affected by the underlying
// seek offset.
//
// Clients of WriteAt can execute parallel WriteAt calls on the same
// destination if the ranges do not overlap.
//
// Implementations must not retain p.
type WriterAt interface {
WriteAt(p []byte, off int64) (n int, err error)
}
// ByteReader is the interface that wraps the ReadByte method.
//
// ReadByte reads and returns the next byte from the input or
// any error encountered. If ReadByte returns an error, no input
// byte was consumed, and the returned byte value is undefined.
//
// ReadByte provides an efficient interface for byte-at-time
// processing. A Reader that does not implement ByteReader
// can be wrapped using bufio.NewReader to add this method.
type ByteReader interface {
ReadByte() (byte, error)
}
// ByteScanner is the interface that adds the UnreadByte method to the
// basic ReadByte method.
//
// UnreadByte causes the next call to ReadByte to return the last byte read.
// If the last operation was not a successful call to ReadByte, UnreadByte may
// return an error, unread the last byte read (or the byte prior to the
// last-unread byte), or (in implementations that support the Seeker interface)
// seek to one byte before the current offset.
type ByteScanner interface {
ByteReader
UnreadByte() error
}
// ByteWriter is the interface that wraps the WriteByte method.
type ByteWriter interface {
WriteByte(c byte) error
}
// RuneReader is the interface that wraps the ReadRune method.
//
// ReadRune reads a single encoded Unicode character
// and returns the rune and its size in bytes. If no character is
// available, err will be set.
type RuneReader interface {
ReadRune() (r rune, size int, err error)
}
// RuneScanner is the interface that adds the UnreadRune method to the
// basic ReadRune method.
//
// UnreadRune causes the next call to ReadRune to return the last rune read.
// If the last operation was not a successful call to ReadRune, UnreadRune may
// return an error, unread the last rune read (or the rune prior to the
// last-unread rune), or (in implementations that support the Seeker interface)
// seek to the start of the rune before the current offset.
type RuneScanner interface {
RuneReader
UnreadRune() error
}
// StringWriter is the interface that wraps the WriteString method.
type StringWriter interface {
WriteString(s string) (n int, err error)
}
// WriteString writes the contents of the string s to w, which accepts a slice of bytes.
// If w implements StringWriter, its WriteString method is invoked directly.
// Otherwise, w.Write is called exactly once.
func WriteString(w Writer, s string) (n int, err error) {
if sw, ok := w.(StringWriter); ok {
return sw.WriteString(s)
}
return w.Write([]byte(s))
}
// ReadAtLeast reads from r into buf until it has read at least min bytes.
// It returns the number of bytes copied and an error if fewer bytes were read.
// The error is EOF only if no bytes were read.
// If an EOF happens after reading fewer than min bytes,
// ReadAtLeast returns ErrUnexpectedEOF.
// If min is greater than the length of buf, ReadAtLeast returns ErrShortBuffer.
// On return, n >= min if and only if err == nil.
// If r returns an error having read at least min bytes, the error is dropped.
func ReadAtLeast(r Reader, buf []byte, min int) (n int, err error) {
if len(buf) < min {
return 0, ErrShortBuffer
}
for n < min && err == nil {
var nn int
nn, err = r.Read(buf[n:])
n += nn
}
if n >= min {
err = nil
} else if n > 0 && err == EOF {
err = ErrUnexpectedEOF
}
return
}
// ReadFull reads exactly len(buf) bytes from r into buf.
// It returns the number of bytes copied and an error if fewer bytes were read.
// The error is EOF only if no bytes were read.
// If an EOF happens after reading some but not all the bytes,
// ReadFull returns ErrUnexpectedEOF.
// On return, n == len(buf) if and only if err == nil.
// If r returns an error having read at least len(buf) bytes, the error is dropped.
func ReadFull(r Reader, buf []byte) (n int, err error) {
return ReadAtLeast(r, buf, len(buf))
}
// CopyN copies n bytes (or until an error) from src to dst.
// It returns the number of bytes copied and the earliest
// error encountered while copying.
// On return, written == n if and only if err == nil.
//
// If dst implements the ReaderFrom interface,
// the copy is implemented using it.
func CopyN(dst Writer, src Reader, n int64) (written int64, err error) {
written, err = Copy(dst, LimitReader(src, n))
if written == n {
return n, nil
}
if written < n && err == nil {
// src stopped early; must have been EOF.
err = EOF
}
return
}
// Copy copies from src to dst until either EOF is reached
// on src or an error occurs. It returns the number of bytes
// copied and the first error encountered while copying, if any.
//
// A successful Copy returns err == nil, not err == EOF.
// Because Copy is defined to read from src until EOF, it does
// not treat an EOF from Read as an error to be reported.
//
// If src implements the WriterTo interface,
// the copy is implemented by calling src.WriteTo(dst).
// Otherwise, if dst implements the ReaderFrom interface,
// the copy is implemented by calling dst.ReadFrom(src).
func Copy(dst Writer, src Reader) (written int64, err error) {
return copyBuffer(dst, src, nil)
}
// CopyBuffer is identical to Copy except that it stages through the
// provided buffer (if one is required) rather than allocating a
// temporary one. If buf is nil, one is allocated; otherwise if it has
// zero length, CopyBuffer panics.
//
// If either src implements WriterTo or dst implements ReaderFrom,
// buf will not be used to perform the copy.
func CopyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) {
if buf != nil && len(buf) == 0 {
panic("empty buffer in CopyBuffer")
}
return copyBuffer(dst, src, buf)
}
// copyBuffer is the actual implementation of Copy and CopyBuffer.
// if buf is nil, one is allocated.
func copyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) {
// If the reader has a WriteTo method, use it to do the copy.
// Avoids an allocation and a copy.
if wt, ok := src.(WriterTo); ok {
return wt.WriteTo(dst)
}
// Similarly, if the writer has a ReadFrom method, use it to do the copy.
if rt, ok := dst.(ReaderFrom); ok {
return rt.ReadFrom(src)
}
if buf == nil {
size := 32 * 1024
if l, ok := src.(*LimitedReader); ok && int64(size) > l.N {
if l.N < 1 {
size = 1
} else {
size = int(l.N)
}
}
buf = make([]byte, size)
}
for {
nr, er := src.Read(buf)
if nr > 0 {
nw, ew := dst.Write(buf[0:nr])
if nw < 0 || nr < nw {
nw = 0
if ew == nil {
ew = errInvalidWrite
}
}
written += int64(nw)
if ew != nil {
err = ew
break
}
if nr != nw {
err = ErrShortWrite
break
}
}
if er != nil {
if er != EOF {
err = er
}
break
}
}
return written, err
}
// LimitReader returns a Reader that reads from r
// but stops with EOF after n bytes.
// The underlying implementation is a *LimitedReader.
func LimitReader(r Reader, n int64) Reader { return &LimitedReader{r, n} }
// A LimitedReader reads from R but limits the amount of
// data returned to just N bytes. Each call to Read
// updates N to reflect the new amount remaining.
// Read returns EOF when N <= 0 or when the underlying R returns EOF.
type LimitedReader struct {
R Reader // underlying reader
N int64 // max bytes remaining
}
func (l *LimitedReader) Read(p []byte) (n int, err error) {
if l.N <= 0 {
return 0, EOF
}
if int64(len(p)) > l.N {
p = p[0:l.N]
}
n, err = l.R.Read(p)
l.N -= int64(n)
return
}
// NewSectionReader returns a SectionReader that reads from r
// starting at offset off and stops with EOF after n bytes.
func NewSectionReader(r ReaderAt, off int64, n int64) *SectionReader {
var remaining int64
const maxint64 = 1<<63 - 1
if off <= maxint64-n {
remaining = n + off
} else {
// Overflow, with no way to return error.
// Assume we can read up to an offset of 1<<63 - 1.
remaining = maxint64
}
return &SectionReader{r, off, off, remaining}
}
// SectionReader implements Read, Seek, and ReadAt on a section
// of an underlying ReaderAt.
type SectionReader struct {
r ReaderAt
base int64
off int64
limit int64
}
func (s *SectionReader) Read(p []byte) (n int, err error) {
if s.off >= s.limit {
return 0, EOF
}
if max := s.limit - s.off; int64(len(p)) > max {
p = p[0:max]
}
n, err = s.r.ReadAt(p, s.off)
s.off += int64(n)
return
}
var errWhence = errors.New("Seek: invalid whence")
var errOffset = errors.New("Seek: invalid offset")
func (s *SectionReader) Seek(offset int64, whence int) (int64, error) {
switch whence {
default:
return 0, errWhence
case SeekStart:
offset += s.base
case SeekCurrent:
offset += s.off
case SeekEnd:
offset += s.limit
}
if offset < s.base {
return 0, errOffset
}
s.off = offset
return offset - s.base, nil
}
func (s *SectionReader) ReadAt(p []byte, off int64) (n int, err error) {
if off < 0 || off >= s.limit-s.base {
return 0, EOF
}
off += s.base
if max := s.limit - off; int64(len(p)) > max {
p = p[0:max]
n, err = s.r.ReadAt(p, off)
if err == nil {
err = EOF
}
return n, err
}
return s.r.ReadAt(p, off)
}
// Size returns the size of the section in bytes.
func (s *SectionReader) Size() int64 { return s.limit - s.base }
// An OffsetWriter maps writes at offset base to offset base+off in the underlying writer.
type OffsetWriter struct {
w WriterAt
base int64 // the original offset
off int64 // the current offset
}
// NewOffsetWriter returns an OffsetWriter that writes to w
// starting at offset off.
func NewOffsetWriter(w WriterAt, off int64) *OffsetWriter {
return &OffsetWriter{w, off, off}
}
func (o *OffsetWriter) Write(p []byte) (n int, err error) {
n, err = o.w.WriteAt(p, o.off)
o.off += int64(n)
return
}
func (o *OffsetWriter) WriteAt(p []byte, off int64) (n int, err error) {
if off < 0 {
return 0, errOffset
}
off += o.base
return o.w.WriteAt(p, off)
}
func (o *OffsetWriter) Seek(offset int64, whence int) (int64, error) {
switch whence {
default:
return 0, errWhence
case SeekStart:
offset += o.base
case SeekCurrent:
offset += o.off
}
if offset < o.base {
return 0, errOffset
}
o.off = offset
return offset - o.base, nil
}
// TeeReader returns a Reader that writes to w what it reads from r.
// All reads from r performed through it are matched with
// corresponding writes to w. There is no internal buffering -
// the write must complete before the read completes.
// Any error encountered while writing is reported as a read error.
func TeeReader(r Reader, w Writer) Reader {
return &teeReader{r, w}
}
type teeReader struct {
r Reader
w Writer
}
func (t *teeReader) Read(p []byte) (n int, err error) {
n, err = t.r.Read(p)
if n > 0 {
if n, err := t.w.Write(p[:n]); err != nil {
return n, err
}
}
return
}
// Discard is a Writer on which all Write calls succeed
// without doing anything.
var Discard Writer = discard{}
type discard struct{}
// discard implements ReaderFrom as an optimization so Copy to
// io.Discard can avoid doing unnecessary work.
var _ ReaderFrom = discard{}
func (discard) Write(p []byte) (int, error) {
return len(p), nil
}
func (discard) WriteString(s string) (int, error) {
return len(s), nil
}
/* TODO(xsw):
var blackHolePool = sync.Pool{
New: func() any {
b := make([]byte, 8192)
return &b
},
}
*/
func (discard) ReadFrom(r Reader) (n int64, err error) {
/*
bufp := blackHolePool.Get().(*[]byte)
readSize := 0
for {
readSize, err = r.Read(*bufp)
n += int64(readSize)
if err != nil {
blackHolePool.Put(bufp)
if err == EOF {
return n, nil
}
return
}
}
*/
panic("todo")
}
// NopCloser returns a ReadCloser with a no-op Close method wrapping
// the provided Reader r.
// If r implements WriterTo, the returned ReadCloser will implement WriterTo
// by forwarding calls to r.
func NopCloser(r Reader) ReadCloser {
if _, ok := r.(WriterTo); ok {
return nopCloserWriterTo{r}
}
return nopCloser{r}
}
type nopCloser struct {
Reader
}
func (nopCloser) Close() error { return nil }
type nopCloserWriterTo struct {
Reader
}
func (nopCloserWriterTo) Close() error { return nil }
func (c nopCloserWriterTo) WriteTo(w Writer) (n int64, err error) {
return c.Reader.(WriterTo).WriteTo(w)
}
// ReadAll reads from r until an error or EOF and returns the data it read.
// A successful call returns err == nil, not err == EOF. Because ReadAll is
// defined to read from src until EOF, it does not treat an EOF from Read
// as an error to be reported.
func ReadAll(r Reader) ([]byte, error) {
b := make([]byte, 0, 512)
for {
n, err := r.Read(b[len(b):cap(b)])
b = b[:len(b)+n]
if err != nil {
if err == EOF {
err = nil
}
return b, err
}
if len(b) == cap(b) {
// Add more capacity (let append pick how much).
b = append(b, 0)[:len(b)]
}
}
}