github.com/panjjo/go@v0.0.0-20161104043856-d62b31386338/src/os/path_windows.go (about) 1 // Copyright 2011 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 package os 6 7 const ( 8 PathSeparator = '\\' // OS-specific path separator 9 PathListSeparator = ';' // OS-specific path list separator 10 ) 11 12 // IsPathSeparator reports whether c is a directory separator character. 13 func IsPathSeparator(c uint8) bool { 14 // NOTE: Windows accept / as path separator. 15 return c == '\\' || c == '/' 16 } 17 18 // basename removes trailing slashes and the leading 19 // directory name and drive letter from path name. 20 func basename(name string) string { 21 // Remove drive letter 22 if len(name) == 2 && name[1] == ':' { 23 name = "." 24 } else if len(name) > 2 && name[1] == ':' { 25 name = name[2:] 26 } 27 i := len(name) - 1 28 // Remove trailing slashes 29 for ; i > 0 && (name[i] == '/' || name[i] == '\\'); i-- { 30 name = name[:i] 31 } 32 // Remove leading directory name 33 for i--; i >= 0; i-- { 34 if name[i] == '/' || name[i] == '\\' { 35 name = name[i+1:] 36 break 37 } 38 } 39 return name 40 } 41 42 func isAbs(path string) (b bool) { 43 v := volumeName(path) 44 if v == "" { 45 return false 46 } 47 path = path[len(v):] 48 if path == "" { 49 return false 50 } 51 return IsPathSeparator(path[0]) 52 } 53 54 func volumeName(path string) (v string) { 55 if len(path) < 2 { 56 return "" 57 } 58 // with drive letter 59 c := path[0] 60 if path[1] == ':' && 61 ('0' <= c && c <= '9' || 'a' <= c && c <= 'z' || 62 'A' <= c && c <= 'Z') { 63 return path[:2] 64 } 65 // is it UNC 66 if l := len(path); l >= 5 && IsPathSeparator(path[0]) && IsPathSeparator(path[1]) && 67 !IsPathSeparator(path[2]) && path[2] != '.' { 68 // first, leading `\\` and next shouldn't be `\`. its server name. 69 for n := 3; n < l-1; n++ { 70 // second, next '\' shouldn't be repeated. 71 if IsPathSeparator(path[n]) { 72 n++ 73 // third, following something characters. its share name. 74 if !IsPathSeparator(path[n]) { 75 if path[n] == '.' { 76 break 77 } 78 for ; n < l; n++ { 79 if IsPathSeparator(path[n]) { 80 break 81 } 82 } 83 return path[:n] 84 } 85 break 86 } 87 } 88 } 89 return "" 90 } 91 92 func fromSlash(path string) string { 93 // Replace each '/' with '\\' if present 94 var pathbuf []byte 95 var lastSlash int 96 for i, b := range path { 97 if b == '/' { 98 if pathbuf == nil { 99 pathbuf = make([]byte, len(path)) 100 } 101 copy(pathbuf[lastSlash:], path[lastSlash:i]) 102 pathbuf[i] = '\\' 103 lastSlash = i + 1 104 } 105 } 106 if pathbuf == nil { 107 return path 108 } 109 110 copy(pathbuf[lastSlash:], path[lastSlash:]) 111 return string(pathbuf) 112 } 113 114 func dirname(path string) string { 115 vol := volumeName(path) 116 i := len(path) - 1 117 for i >= len(vol) && !IsPathSeparator(path[i]) { 118 i-- 119 } 120 dir := path[len(vol) : i+1] 121 last := len(dir) - 1 122 if last > 0 && IsPathSeparator(dir[last]) { 123 dir = dir[:last] 124 } 125 if dir == "" { 126 dir = "." 127 } 128 return vol + dir 129 }