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
	}

	doIssueError := true
	isStatic, abi := p.symRefAttrs(name, doIssueError)

	if p.peek() == '+' || p.peek() == '-' {
		a.Offset = int64(p.expr())
	}
	if isStatic {
		a.Sym = p.ctxt.LookupStatic(name)
	} else {
		a.Sym = p.ctxt.LookupABI(name, abi)
	}
	if p.peek() == scanner.EOF {
		if prefix == 0 && p.isJump {
			// Symbols without prefix or suffix are jump labels.
			return
		}

	if r.err != nil {
		if r.nerr++; r.nerr > 10000 {
			panic("go/build: import reader looping")
		}
		return 0
	}

	// Use r.peek as first input byte.
	// Don't just return r.peek here: it might have been left by peekByte(false)
	// and this might be peekByte(true).
	c := r.peek
	if c == 0 {
		c = r.readByte()
	}
	for r.err == nil && !r.eof {
		if skipSpace {

	}
	if _, err := buf.Peek(1); err != io.EOF {
		t.Fatalf("want EOF got %v", err)
	}

	// Test for issue 3022, not exposing a reader's error on a successful Peek.
	buf = NewReaderSize(dataAndEOFReader("abcd"), 32)
	if s, err := buf.Peek(2); string(s) != "ab" || err != nil {
		t.Errorf(`Peek(2) on "abcd", EOF = %q, %v; want "ab", nil`, string(s), err)
	}
	if s, err := buf.Peek(4); string(s) != "abcd" || err != nil {

	"internal/testenv"
	"os"
	"testing"

	"cmd/internal/bio"
	"cmd/internal/objabi"
)

func dummyWriter(buf *bytes.Buffer) *Writer {
	wr := &bio.Writer{Writer: bufio.NewWriter(buf)} // hacky: no file, so cannot seek
	return NewWriter(wr)
}

func TestReadWrite(t *testing.T) {
	// Test that we get the same data in a write-read roundtrip.

	// Write a symbol, a relocation, and an aux info.
	var buf bytes.Buffer

	cmdOffset := unsafe.Sizeof(exem.FileHeader)
	if is64bit := exem.Magic == macho.Magic64; is64bit {
		// mach_header_64 has one extra uint32.
		cmdOffset += unsafe.Sizeof(exem.Magic)
	}
	if _, err := outf.Seek(int64(cmdOffset), 0); err != nil {
		return err
	}

	// Read the load commands, looking for the LC_UUID cmd. If/when we
	// locate it, overwrite it with a new value produced by
	// uuidFromGoBuildId.

// license that can be found in the LICENSE file.

package main

/*
extern int *GoFn(int *);

// Yes, you can have definitions if you use //export, as long as they are weak.
int f(void) __attribute__ ((weak));

int f() {
  int i;
  int *p = GoFn(&i);
  if (*p != 12345)
    return 0;
  return 1;
}
*/
import "C"

//export GoFn
func GoFn(p *C.int) *C.int {
	*p = C.int(12345)

		default:
			// This should be an ELF object.
			checkELFArchiveObject(t, arname, off, io.NewSectionReader(f, off, size))
		}

		off += size
		if _, err := f.Seek(off, io.SeekStart); err != nil {
			t.Errorf("%s: failed to seek to %d: %v", arname, off, err)
		}
	}
}

// checkELFArchiveObject checks an object in an ELF archive.

	default:
		return n, nil
	}
}

func (sw *sparseFileWriter) ReadFrom(r io.Reader) (n int64, err error) {
	rs, ok := r.(io.ReadSeeker)
	if ok {
		if _, err := rs.Seek(0, io.SeekCurrent); err != nil {
			ok = false // Not all io.Seeker can really seek
		}
	}
	if !ok {
		return io.Copy(struct{ io.Writer }{sw}, r)
	}

	var readLastByte bool
	pos0 := sw.pos

			ml.data[1] = uint32(s1)           // rebase size
			ml.data[2] = uint32(linkoff + s1) // bind off
			ml.data[3] = uint32(s2)           // bind size
			ml.data[4] = 0                    // weak bind off
			ml.data[5] = 0                    // weak bind size
			ml.data[6] = 0                    // lazy bind off
			ml.data[7] = 0                    // lazy bind size
			ml.data[8] = 0                    // export