exec.LookPath() unix/windows separation
R=brainman, rsc, vcc, rsc1
CC=golang-dev
https://golang.org/cl/2068041
diff --git a/src/pkg/exec/lp_windows.go b/src/pkg/exec/lp_windows.go
new file mode 100644
index 0000000..bdf6e00
--- /dev/null
+++ b/src/pkg/exec/lp_windows.go
@@ -0,0 +1,66 @@
+// Copyright 2010 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 exec
+
+import (
+ "os"
+ "strings"
+)
+
+func chkStat(file string) bool {
+ d, err := os.Stat(file)
+ if err != nil {
+ return false
+ }
+ return d.IsRegular()
+}
+
+func canExec(file string, exts []string) (string, bool) {
+ if len(exts) == 0 {
+ return file, chkStat(file)
+ }
+ f := strings.ToLower(file)
+ for _, e := range exts {
+ if strings.HasSuffix(f, e) {
+ return file, chkStat(file)
+ }
+ }
+ for _, e := range exts {
+ if f := file + e; chkStat(f) {
+ return f, true
+ }
+ }
+ return ``, false
+}
+
+func LookPath(file string) (string, os.Error) {
+ exts := []string{}
+ if x := os.Getenv(`PATHEXT`); x != `` {
+ exts = strings.Split(strings.ToLower(x), `;`, -1)
+ for i, e := range exts {
+ if e == `` || e[0] != '.' {
+ exts[i] = `.` + e
+ }
+ }
+ }
+ if strings.Index(file, `\`) >= 0 || strings.Index(file, `/`) >= 0 {
+ if f, ok := canExec(file, exts); ok {
+ return f, nil
+ }
+ return ``, os.ENOENT
+ }
+ if pathenv := os.Getenv(`PATH`); pathenv == `` {
+ if f, ok := canExec(`.\`+file, exts); ok {
+ return f, nil
+ }
+ } else {
+ for _, dir := range strings.Split(pathenv, `;`, -1) {
+ if f, ok := canExec(dir+`\`+file, exts); ok {
+ return f, nil
+ }
+ }
+ }
+ return ``, os.ENOENT
+}
