path_unix.go

     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  //go:build unix || (js && wasm) || wasip1
     6  
     7  package os
     8  
     9  const (
    10  	PathSeparator     = '/' // OS-specific path separator
    11  	PathListSeparator = ':' // OS-specific path list separator
    12  )
    13  
    14  // IsPathSeparator reports whether c is a directory separator character.
    15  func IsPathSeparator(c uint8) bool {
    16  	return PathSeparator == c
    17  }
    18  
    19  // splitPath returns the base name and parent directory.
    20  func splitPath(path string) (string, string) {
    21  	// if no better parent is found, the path is relative from "here"
    22  	dirname := "."
    23  
    24  	// Remove all but one leading slash.
    25  	for len(path) > 1 && path[0] == '/' && path[1] == '/' {
    26  		path = path[1:]
    27  	}
    28  
    29  	i := len(path) - 1
    30  
    31  	// Remove trailing slashes.
    32  	for ; i > 0 && path[i] == '/'; i-- {
    33  		path = path[:i]
    34  	}
    35  
    36  	// if no slashes in path, base is path
    37  	basename := path
    38  
    39  	// Remove leading directory path
    40  	for i--; i >= 0; i-- {
    41  		if path[i] == '/' {
    42  			if i == 0 {
    43  				dirname = path[:1]
    44  			} else {
    45  				dirname = path[:i]
    46  			}
    47  			basename = path[i+1:]
    48  			break
    49  		}
    50  	}
    51  
    52  	return dirname, basename
    53  }
    54
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