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// 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.
package main
import (
"exec"
"fmt"
"go/token"
"io/ioutil"
"os"
)
// A ByteReaderAt implements io.ReadAt using a slice of bytes.
type ByteReaderAt []byte
func (r ByteReaderAt) ReadAt(p []byte, off int64) (n int, err os.Error) {
if off >= int64(len(r)) || off < 0 {
return 0, os.EOF
}
return copy(p, r[off:]), nil
}
// run runs the command argv, feeding in stdin on standard input.
// It returns the output to standard output and standard error.
// ok indicates whether the command exited successfully.
func run(stdin []byte, argv []string) (stdout, stderr []byte, ok bool) {
cmd, err := exec.LookPath(argv[0])
if err != nil {
fatal("exec %s: %s", argv[0], err)
}
r0, w0, err := os.Pipe()
if err != nil {
fatal("%s", err)
}
r1, w1, err := os.Pipe()
if err != nil {
fatal("%s", err)
}
r2, w2, err := os.Pipe()
if err != nil {
fatal("%s", err)
}
pid, err := os.ForkExec(cmd, argv, os.Environ(), "", []*os.File{r0, w1, w2})
if err != nil {
fatal("%s", err)
}
r0.Close()
w1.Close()
w2.Close()
c := make(chan bool)
go func() {
w0.Write(stdin)
w0.Close()
c <- true
}()
var xstdout []byte // TODO(rsc): delete after 6g can take address of out parameter
go func() {
xstdout, _ = ioutil.ReadAll(r1)
r1.Close()
c <- true
}()
stderr, _ = ioutil.ReadAll(r2)
r2.Close()
<-c
<-c
stdout = xstdout
w, err := os.Wait(pid, 0)
if err != nil {
fatal("%s", err)
}
ok = w.Exited() && w.ExitStatus() == 0
return
}
// Die with an error message.
func fatal(msg string, args ...interface{}) {
fmt.Fprintf(os.Stderr, msg+"\n", args)
os.Exit(2)
}
var nerrors int
var noPos token.Position
func error(pos token.Position, msg string, args ...interface{}) {
nerrors++
if pos.IsValid() {
fmt.Fprintf(os.Stderr, "%s: ", pos)
}
fmt.Fprintf(os.Stderr, msg, args)
fmt.Fprintf(os.Stderr, "\n")
}
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