diff options
Diffstat (limited to 'libgo/go/os/exec/lp_windows.go')
-rw-r--r-- | libgo/go/os/exec/lp_windows.go | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/libgo/go/os/exec/lp_windows.go b/libgo/go/os/exec/lp_windows.go new file mode 100644 index 00000000000..db326236ee8 --- /dev/null +++ b/libgo/go/os/exec/lp_windows.go @@ -0,0 +1,78 @@ +// 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 ( + "errors" + "os" + "strings" +) + +// ErrNotFound is the error resulting if a path search failed to find an executable file. +var ErrNotFound = errors.New("executable file not found in %PATH%") + +func chkStat(file string) error { + d, err := os.Stat(file) + if err != nil { + return err + } + if d.IsRegular() { + return nil + } + return os.EPERM +} + +func findExecutable(file string, exts []string) (string, error) { + 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) == nil { + return f, nil + } + } + return ``, os.ENOENT +} + +func LookPath(file string) (f string, err error) { + x := os.Getenv(`PATHEXT`) + if x == `` { + x = `.COM;.EXE;.BAT;.CMD` + } + exts := []string{} + for _, e := range strings.Split(strings.ToLower(x), `;`) { + if e == "" { + continue + } + if e[0] != '.' { + e = "." + e + } + exts = append(exts, e) + } + if strings.IndexAny(file, `:\/`) != -1 { + if f, err = findExecutable(file, exts); err == nil { + return + } + return ``, &Error{file, err} + } + if pathenv := os.Getenv(`PATH`); pathenv == `` { + if f, err = findExecutable(`.\`+file, exts); err == nil { + return + } + } else { + for _, dir := range strings.Split(pathenv, `;`) { + if f, err = findExecutable(dir+`\`+file, exts); err == nil { + return + } + } + } + return ``, &Error{file, ErrNotFound} +} |