env_windows.go

Documentation: cmd/vendor/golang.org/x/sys/windows

     1  // Copyright 2010 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  // Windows environment variables.
     6  
     7  package windows
     8  
     9  import (
    10  	"syscall"
    11  	"unsafe"
    12  )
    13  
    14  func Getenv(key string) (value string, found bool) {
    15  	return syscall.Getenv(key)
    16  }
    17  
    18  func Setenv(key, value string) error {
    19  	return syscall.Setenv(key, value)
    20  }
    21  
    22  func Clearenv() {
    23  	syscall.Clearenv()
    24  }
    25  
    26  func Environ() []string {
    27  	return syscall.Environ()
    28  }
    29  
    30  // Returns a default environment associated with the token, rather than the current
    31  // process. If inheritExisting is true, then this environment also inherits the
    32  // environment of the current process.
    33  func (token Token) Environ(inheritExisting bool) (env []string, err error) {
    34  	var block *uint16
    35  	err = CreateEnvironmentBlock(&block, token, inheritExisting)
    36  	if err != nil {
    37  		return nil, err
    38  	}
    39  	defer DestroyEnvironmentBlock(block)
    40  	blockp := unsafe.Pointer(block)
    41  	for {
    42  		entry := UTF16PtrToString((*uint16)(blockp))
    43  		if len(entry) == 0 {
    44  			break
    45  		}
    46  		env = append(env, entry)
    47  		blockp = unsafe.Add(blockp, 2*(len(entry)+1))
    48  	}
    49  	return env, nil
    50  }
    51  
    52  func Unsetenv(key string) error {
    53  	return syscall.Unsetenv(key)
    54  }
    55
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