1 // Copyright 2018 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 str 6 7 import ( 8 "path/filepath" 9 "strings" 10 ) 11 12 // HasFilePathPrefix reports whether the filesystem path s begins with the 13 // elements in prefix. 14 func HasFilePathPrefix(s, prefix string) bool { 15 sv := strings.ToUpper(filepath.VolumeName(s)) 16 pv := strings.ToUpper(filepath.VolumeName(prefix)) 17 s = s[len(sv):] 18 prefix = prefix[len(pv):] 19 switch { 20 default: 21 return false 22 case sv != pv: 23 return false 24 case len(s) == len(prefix): 25 return s == prefix 26 case len(s) > len(prefix): 27 if prefix != "" && prefix[len(prefix)-1] == filepath.Separator { 28 return strings.HasPrefix(s, prefix) 29 } 30 return s[len(prefix)] == filepath.Separator && s[:len(prefix)] == prefix 31 } 32 } 33
