if len(toread) < amt {
		amt = len(toread)
	}
	copy(b, toread)
	r.off += int64(amt)
	return amt, nil
}

func (r *Reader) Seek(offset int64, whence int) (ret int64, err error) {
	switch whence {
	case io.SeekStart:
		if offset < 0 || offset > int64(len(r.b)) {
			return 0, fmt.Errorf("invalid seek: new offset %d (out of range [0 %d]", offset, len(r.b))
		}
		r.off = offset
		return offset, nil
	case io.SeekCurrent:

		fmt.Fprintf(os.Stderr, "=-= after readHeader: %+v\n", d.hdr)
	}
	return nil
}

func (d *CoverageMetaDataDecoder) readStringTable() error {
	// Seek to the correct location to read the string table.
	stringTableLocation := int64(coverage.CovMetaHeaderSize + 4*d.hdr.NumFuncs)
	if _, err := d.r.Seek(stringTableLocation, io.SeekStart); err != nil {
		return err
	}

	// Read the table itself.
	d.strtab = stringtab.NewReader(d.r)

	var cmd loadCmd

	r.offset = r.next
	if _, err := r.f.Seek(r.offset, 0); err != nil {
		return cmd, err
	}
	if err := binary.Read(r.f, r.order, &cmd); err != nil {
		return cmd, err
	}
	r.next = r.offset + int64(cmd.Len)
	return cmd, nil
}

func (r loadCmdReader) ReadAt(offset int64, data interface{}) error {
	if _, err := r.f.Seek(r.offset+offset, 0); err != nil {
		return err
	}

				}
			}
		}
		// Do not call eofError; caller does not expect to see io.EOF.
		return n, err
	}
}

// Seek wraps syscall.Seek.
func (fd *FD) Seek(offset int64, whence int) (int64, error) {
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()
	return syscall.Seek(fd.Sysfd, offset, whence)

		},
		func() error {
			return syscall.Mount(-1, 0, "", 0, "")
		})
	// originally failed only on plan9_arm
	testalias(t,
		"seek",
		func() error {
			_, err := syscall.Seek(0, 0, -1)
			return err
		},
		func() error {
			_, err := syscall.Seek(-1, 0, 0)
			return err
		})

	if whence == 1 {
		offset -= int64(r.Buffered())
	}
	off, err := r.f.Seek(offset, whence)
	if err != nil {
		log.Fatalf("seeking in output: %v", err)
	}
	r.Reset(r.f)
	return off
}

func (w *Writer) MustSeek(offset int64, whence int) int64 {
	if err := w.Flush(); err != nil {
		log.Fatalf("writing output: %v", err)
	}
	off, err := w.f.Seek(offset, whence)
	if err != nil {
		log.Fatalf("seeking in output: %v", err)

	return nil
}

// Seek implements the [io.Seeker] interface.
func (r *Reader) Seek(offset int64, whence int) (int64, error) {
	r.prevRune = -1
	var abs int64
	switch whence {
	case io.SeekStart:
		abs = offset
	case io.SeekCurrent:
		abs = r.i + offset
	case io.SeekEnd:
		abs = int64(len(r.s)) + offset
	default:
		return 0, errors.New("strings.Reader.Seek: invalid whence")
	}
	if abs < 0 {

// assume they are safe for parallel execution.
package io

import (
	"errors"
	"sync"
)

// 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.

	if _, err := s.sr.Seek(int64(stoff), io.SeekStart); err != nil {
		return nil, err
	}
	st := make([]byte, stlen)
	if _, err := io.ReadFull(s.sr, st); err != nil {
		return nil, err
	}

	// Read imported libraries
	libs, err := f.readImportIDs(s)
	if err != nil {
		return nil, err
	}

	// Read loader symbol table
	if _, err := s.sr.Seek(int64(symoff), io.SeekStart); err != nil {

	// a bit brittle but cannot be addressed without a large change of the
	// algorithm in the os.(*File).readdir method.
	return n - len(b), nil
}

// Seek wraps syscall.Seek.
func (fd *FD) Seek(offset int64, whence int) (int64, error) {
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()
	// syscall.Filetype is a uint8 but we store it as a uint32 in SysFile in