Zack Williams | e940c7a | 2019-08-21 14:25:39 -0700 | [diff] [blame] | 1 | // Copyright 2009 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // Fork, exec, wait, etc. |
| 6 | |
| 7 | package windows |
| 8 | |
| 9 | // EscapeArg rewrites command line argument s as prescribed |
| 10 | // in http://msdn.microsoft.com/en-us/library/ms880421. |
| 11 | // This function returns "" (2 double quotes) if s is empty. |
| 12 | // Alternatively, these transformations are done: |
| 13 | // - every back slash (\) is doubled, but only if immediately |
| 14 | // followed by double quote ("); |
| 15 | // - every double quote (") is escaped by back slash (\); |
| 16 | // - finally, s is wrapped with double quotes (arg -> "arg"), |
| 17 | // but only if there is space or tab inside s. |
| 18 | func EscapeArg(s string) string { |
| 19 | if len(s) == 0 { |
| 20 | return "\"\"" |
| 21 | } |
| 22 | n := len(s) |
| 23 | hasSpace := false |
| 24 | for i := 0; i < len(s); i++ { |
| 25 | switch s[i] { |
| 26 | case '"', '\\': |
| 27 | n++ |
| 28 | case ' ', '\t': |
| 29 | hasSpace = true |
| 30 | } |
| 31 | } |
| 32 | if hasSpace { |
| 33 | n += 2 |
| 34 | } |
| 35 | if n == len(s) { |
| 36 | return s |
| 37 | } |
| 38 | |
| 39 | qs := make([]byte, n) |
| 40 | j := 0 |
| 41 | if hasSpace { |
| 42 | qs[j] = '"' |
| 43 | j++ |
| 44 | } |
| 45 | slashes := 0 |
| 46 | for i := 0; i < len(s); i++ { |
| 47 | switch s[i] { |
| 48 | default: |
| 49 | slashes = 0 |
| 50 | qs[j] = s[i] |
| 51 | case '\\': |
| 52 | slashes++ |
| 53 | qs[j] = s[i] |
| 54 | case '"': |
| 55 | for ; slashes > 0; slashes-- { |
| 56 | qs[j] = '\\' |
| 57 | j++ |
| 58 | } |
| 59 | qs[j] = '\\' |
| 60 | j++ |
| 61 | qs[j] = s[i] |
| 62 | } |
| 63 | j++ |
| 64 | } |
| 65 | if hasSpace { |
| 66 | for ; slashes > 0; slashes-- { |
| 67 | qs[j] = '\\' |
| 68 | j++ |
| 69 | } |
| 70 | qs[j] = '"' |
| 71 | j++ |
| 72 | } |
| 73 | return string(qs[:j]) |
| 74 | } |
| 75 | |
| 76 | func CloseOnExec(fd Handle) { |
| 77 | SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0) |
| 78 | } |
| 79 | |
| 80 | // FullPath retrieves the full path of the specified file. |
| 81 | func FullPath(name string) (path string, err error) { |
| 82 | p, err := UTF16PtrFromString(name) |
| 83 | if err != nil { |
| 84 | return "", err |
| 85 | } |
| 86 | n := uint32(100) |
| 87 | for { |
| 88 | buf := make([]uint16, n) |
| 89 | n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil) |
| 90 | if err != nil { |
| 91 | return "", err |
| 92 | } |
| 93 | if n <= uint32(len(buf)) { |
| 94 | return UTF16ToString(buf[:n]), nil |
| 95 | } |
| 96 | } |
| 97 | } |