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|
package file
import (
"os"
"strings"
"sync"
"syscall"
)
type Flags int32
var flagsToHumanCache sync.Map
var unknownFlag = Flags(-1)
type tuple struct {
syscallNr int
str string
}
var flagsToHuman = []tuple{
{-1, "O_NONE"},
{syscall.O_RDONLY, "O_RDONLY"},
{syscall.O_WRONLY, "O_WRONLY"},
{syscall.O_RDWR, "O_RDWR"},
{syscall.O_ACCMODE, "O_ACCMODE"},
{syscall.O_APPEND, "O_APPEND"},
{syscall.O_ASYNC, "O_ASYNC"},
{syscall.O_CLOEXEC, "O_CLOEXEC"},
{syscall.O_CREAT, "O_CREAT"},
{syscall.O_DIRECT, "O_DIRECT"},
{syscall.O_DIRECTORY, "O_DIRECTORY"},
{syscall.O_DSYNC, "O_DSYNC"},
{syscall.O_EXCL, "O_EXCL"},
{syscall.O_NOATIME, "O_NOATIME"},
{syscall.O_NOCTTY, "O_NOCTTY"},
{syscall.O_NOFOLLOW, "O_NOFOLLOW"},
{syscall.O_NONBLOCK, "O_NONBLOCK"},
{syscall.O_SYNC, "O_SYNC"},
{syscall.O_TRUNC, "O_TRUNC"},
}
func (f Flags) Is(flag int) bool {
if f == unknownFlag {
return false
}
if int(f)&flag == flag {
return true
}
return false
}
func (f Flags) BuildString(sb *strings.Builder) {
if cached, ok := flagsToHumanCache.Load(f); ok {
str, _ := cached.(string)
sb.WriteString(str)
return
}
str := f.String()
cached, loaded := flagsToHumanCache.LoadOrStore(f, str)
if loaded {
str, _ = cached.(string)
}
sb.WriteString(str)
}
func (f Flags) String() string {
var strs []string
if f == -1 {
return "O_NONE"
}
if int(f)&(os.O_WRONLY|os.O_RDWR) == 0 {
// Must be read only then
strs = append(strs, "O_RDONLY")
}
for _, toHuman := range flagsToHuman[2:] {
if int(f)&toHuman.syscallNr == toHuman.syscallNr {
strs = append(strs, toHuman.str)
}
}
if len(strs) == 0 {
strs = append(strs, "O_RDONLY")
}
return strings.Join(strs, "|")
}
|
