mirror of https://github.com/docker/cli.git
133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Fork, exec, wait, etc.
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package windows
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import (
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errorspkg "errors"
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"unsafe"
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)
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// EscapeArg rewrites command line argument s as prescribed
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// in http://msdn.microsoft.com/en-us/library/ms880421.
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// This function returns "" (2 double quotes) if s is empty.
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// Alternatively, these transformations are done:
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// - every back slash (\) is doubled, but only if immediately
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// followed by double quote (");
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// - every double quote (") is escaped by back slash (\);
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// - finally, s is wrapped with double quotes (arg -> "arg"),
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// but only if there is space or tab inside s.
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func EscapeArg(s string) string {
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if len(s) == 0 {
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return "\"\""
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}
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n := len(s)
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hasSpace := false
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for i := 0; i < len(s); i++ {
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switch s[i] {
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case '"', '\\':
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n++
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case ' ', '\t':
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hasSpace = true
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}
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}
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if hasSpace {
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n += 2
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}
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if n == len(s) {
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return s
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}
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qs := make([]byte, n)
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j := 0
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if hasSpace {
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qs[j] = '"'
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j++
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}
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slashes := 0
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for i := 0; i < len(s); i++ {
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switch s[i] {
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default:
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slashes = 0
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qs[j] = s[i]
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case '\\':
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slashes++
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qs[j] = s[i]
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case '"':
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for ; slashes > 0; slashes-- {
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qs[j] = '\\'
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j++
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}
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qs[j] = '\\'
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j++
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qs[j] = s[i]
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}
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j++
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}
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if hasSpace {
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for ; slashes > 0; slashes-- {
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qs[j] = '\\'
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j++
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}
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qs[j] = '"'
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j++
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}
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return string(qs[:j])
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}
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func CloseOnExec(fd Handle) {
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SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
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}
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// FullPath retrieves the full path of the specified file.
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func FullPath(name string) (path string, err error) {
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p, err := UTF16PtrFromString(name)
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if err != nil {
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return "", err
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}
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n := uint32(100)
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for {
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buf := make([]uint16, n)
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n, err = GetFullPathName(p, uint32(len(buf)), &buf[0], nil)
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if err != nil {
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return "", err
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}
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if n <= uint32(len(buf)) {
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return UTF16ToString(buf[:n]), nil
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}
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}
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}
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// NewProcThreadAttributeList allocates a new ProcThreadAttributeList, with the requested maximum number of attributes.
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func NewProcThreadAttributeList(maxAttrCount uint32) (*ProcThreadAttributeList, error) {
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var size uintptr
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err := initializeProcThreadAttributeList(nil, maxAttrCount, 0, &size)
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if err != ERROR_INSUFFICIENT_BUFFER {
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if err == nil {
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return nil, errorspkg.New("unable to query buffer size from InitializeProcThreadAttributeList")
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}
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return nil, err
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}
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const psize = unsafe.Sizeof(uintptr(0))
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// size is guaranteed to be ≥1 by InitializeProcThreadAttributeList.
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al := (*ProcThreadAttributeList)(unsafe.Pointer(&make([]unsafe.Pointer, (size+psize-1)/psize)[0]))
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err = initializeProcThreadAttributeList(al, maxAttrCount, 0, &size)
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if err != nil {
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return nil, err
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}
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return al, err
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}
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// Update modifies the ProcThreadAttributeList using UpdateProcThreadAttribute.
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func (al *ProcThreadAttributeList) Update(attribute uintptr, flags uint32, value unsafe.Pointer, size uintptr, prevValue unsafe.Pointer, returnedSize *uintptr) error {
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return updateProcThreadAttribute(al, flags, attribute, value, size, prevValue, returnedSize)
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}
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// Delete frees ProcThreadAttributeList's resources.
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func (al *ProcThreadAttributeList) Delete() {
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deleteProcThreadAttributeList(al)
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}
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