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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Fork, exec, wait, etc.
package windows
import (
errorspkg "errors"
"unsafe"
"golang.org/x/sys/internal/unsafeheader"
)
// EscapeArg rewrites command line argument s as prescribed
// in http://msdn.microsoft.com/en-us/library/ms880421.
// This function returns "" (2 double quotes) if s is empty.
// Alternatively, these transformations are done:
// - every back slash (\) is doubled, but only if immediately
// followed by double quote (");
// - every double quote (") is escaped by back slash (\);
// - finally, s is wrapped with double quotes (arg -> "arg"),
// but only if there is space or tab inside s.
func EscapeArg(s string) string {
if len(s) == 0 {
return "\"\""
}
n := len(s)
hasSpace := false
for i := 0; i < len(s); i++ {
switch s[i] {
case '"', '\\':
n++
case ' ', '\t':
hasSpace = true
}
}
if hasSpace {
n += 2
}
if n == len(s) {
return s
}
qs := make([]byte, n)
j := 0
if hasSpace {
qs[j] = '"'
j++
}
slashes := 0
for i := 0; i < len(s); i++ {
switch s[i] {
default:
slashes = 0
qs[j] = s[i]
case '\\':
slashes++
qs[j] = s[i]
case '"':
for ; slashes > 0; slashes-- {
qs[j] = '\\'
j++
}
qs[j] = '\\'
j++
qs[j] = s[i]
}
j++
}
if hasSpace {
for ; slashes > 0; slashes-- {
qs[j] = '\\'
j++
}
qs[j] = '"'
j++
}
return string(qs[:j])
}
// ComposeCommandLine escapes and joins the given arguments suitable for use as a Windows command line,
// in CreateProcess's CommandLine argument, CreateService/ChangeServiceConfig's BinaryPathName argument,
// or any program that uses CommandLineToArgv.
func ComposeCommandLine(args []string) string {
var commandLine string
for i := range args {
if i > 0 {
commandLine += " "
}
commandLine += EscapeArg(args[i])
}
return commandLine
}
// DecomposeCommandLine breaks apart its argument command line into unescaped parts using CommandLineToArgv,
// as gathered from GetCommandLine, QUERY_SERVICE_CONFIG's BinaryPathName argument, or elsewhere that
// command lines are passed around.
func DecomposeCommandLine(commandLine string) ([]string, error) {
if len(commandLine) == 0 {
return []string{}, nil
}
var argc int32
argv, err := CommandLineToArgv(StringToUTF16Ptr(commandLine), &argc)
if err != nil {
return nil, err
}
defer LocalFree(Handle(unsafe.Pointer(argv)))
var args []string
for _, v := range (*argv)[:argc] {
args = append(args, UTF16ToString((*v)[:]))
}
return args, nil
}
func CloseOnExec(fd Handle) {
SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
}
// FullPath retrieves the full path of the specified file.
func FullPath(name string) (path string, err error) {
p, err := UTF16PtrFromString(name)
if err != nil {
return "", err
}
n := uint32(100)
for {
buf := make([]uint16, n)
n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
if err != nil {
return "", err
}
if n <= uint32(len(buf)) {
return UTF16ToString(buf[:n]), nil
}
}
}
// NewProcThreadAttributeList allocates a new ProcThreadAttributeListContainer, with the requested maximum number of attributes.
func NewProcThreadAttributeList(maxAttrCount uint32) (*ProcThreadAttributeListContainer, error) {
var size uintptr
err := initializeProcThreadAttributeList(nil, maxAttrCount, 0, &size)
if err != ERROR_INSUFFICIENT_BUFFER {
if err == nil {
return nil, errorspkg.New("unable to query buffer size from InitializeProcThreadAttributeList")
}
return nil, err
}
// size is guaranteed to be ≥1 by InitializeProcThreadAttributeList.
al := &ProcThreadAttributeListContainer{data: (*ProcThreadAttributeList)(unsafe.Pointer(&make([]byte, size)[0]))}
err = initializeProcThreadAttributeList(al.data, maxAttrCount, 0, &size)
if err != nil {
return nil, err
}
return al, err
}
// Update modifies the ProcThreadAttributeList using UpdateProcThreadAttribute.
// Note that the value passed to this function will be copied into memory
// allocated by LocalAlloc, the contents of which should not contain any
// Go-managed pointers, even if the passed value itself is a Go-managed
// pointer.
func (al *ProcThreadAttributeListContainer) Update(attribute uintptr, value unsafe.Pointer, size uintptr) error {
alloc, err := LocalAlloc(LMEM_FIXED, uint32(size))
if err != nil {
return err
}
var src, dst []byte
hdr := (*unsafeheader.Slice)(unsafe.Pointer(&src))
hdr.Data = value
hdr.Cap = int(size)
hdr.Len = int(size)
hdr = (*unsafeheader.Slice)(unsafe.Pointer(&dst))
hdr.Data = unsafe.Pointer(alloc)
hdr.Cap = int(size)
hdr.Len = int(size)
copy(dst, src)
al.heapAllocations = append(al.heapAllocations, alloc)
return updateProcThreadAttribute(al.data, 0, attribute, unsafe.Pointer(alloc), size, nil, nil)
}
// Delete frees ProcThreadAttributeList's resources.
func (al *ProcThreadAttributeListContainer) Delete() {
deleteProcThreadAttributeList(al.data)
for i := range al.heapAllocations {
LocalFree(Handle(al.heapAllocations[i]))
}
al.heapAllocations = nil
}
// List returns the actual ProcThreadAttributeList to be passed to StartupInfoEx.
func (al *ProcThreadAttributeListContainer) List() *ProcThreadAttributeList {
return al.data
}
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