aboutsummaryrefslogtreecommitdiff
path: root/vendor/golang.org/x/sys/windows/exec_windows.go
blob: 3606c3a8b3690599c77bb0460f40dd9327786c05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
// 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.

// Fork, exec, wait, etc.

package windows

// EscapeArg rewrites command line argument s as prescribed
// in http://msdn.microsoft.com/en-us/library/ms880421.
// This function returns "" (2 double quotes) if s is empty.
// Alternatively, these transformations are done:
// - every back slash (\) is doubled, but only if immediately
//   followed by double quote (");
// - every double quote (") is escaped by back slash (\);
// - finally, s is wrapped with double quotes (arg -> "arg"),
//   but only if there is space or tab inside s.
func EscapeArg(s string) string {
	if len(s) == 0 {
		return "\"\""
	}
	n := len(s)
	hasSpace := false
	for i := 0; i < len(s); i++ {
		switch s[i] {
		case '"', '\\':
			n++
		case ' ', '\t':
			hasSpace = true
		}
	}
	if hasSpace {
		n += 2
	}
	if n == len(s) {
		return s
	}

	qs := make([]byte, n)
	j := 0
	if hasSpace {
		qs[j] = '"'
		j++
	}
	slashes := 0
	for i := 0; i < len(s); i++ {
		switch s[i] {
		default:
			slashes = 0
			qs[j] = s[i]
		case '\\':
			slashes++
			qs[j] = s[i]
		case '"':
			for ; slashes > 0; slashes-- {
				qs[j] = '\\'
				j++
			}
			qs[j] = '\\'
			j++
			qs[j] = s[i]
		}
		j++
	}
	if hasSpace {
		for ; slashes > 0; slashes-- {
			qs[j] = '\\'
			j++
		}
		qs[j] = '"'
		j++
	}
	return string(qs[:j])
}

func CloseOnExec(fd Handle) {
	SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
}

// FullPath retrieves the full path of the specified file.
func FullPath(name string) (path string, err error) {
	p, err := UTF16PtrFromString(name)
	if err != nil {
		return "", err
	}
	n := uint32(100)
	for {
		buf := make([]uint16, n)
		n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
		if err != nil {
			return "", err
		}
		if n <= uint32(len(buf)) {
			return UTF16ToString(buf[:n]), nil
		}
	}
}