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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"
)
// 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])
}
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 ProcThreadAttributeList, with the requested maximum number of attributes.
func NewProcThreadAttributeList(maxAttrCount uint32) (*ProcThreadAttributeList, 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
}
const psize = unsafe.Sizeof(uintptr(0))
// size is guaranteed to be ≥1 by InitializeProcThreadAttributeList.
al := (*ProcThreadAttributeList)(unsafe.Pointer(&make([]unsafe.Pointer, (size+psize-1)/psize)[0]))
err = initializeProcThreadAttributeList(al, maxAttrCount, 0, &size)
if err != nil {
return nil, err
}
return al, err
}
// Update modifies the ProcThreadAttributeList using UpdateProcThreadAttribute.
func (al *ProcThreadAttributeList) Update(attribute uintptr, flags uint32, value unsafe.Pointer, size uintptr, prevValue unsafe.Pointer, returnedSize *uintptr) error {
return updateProcThreadAttribute(al, flags, attribute, value, size, prevValue, returnedSize)
}
// Delete frees ProcThreadAttributeList's resources.
func (al *ProcThreadAttributeList) Delete() {
deleteProcThreadAttributeList(al)
}
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