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// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
package fmtutil
import (
"fmt"
"strings"
)
type BitfieldFormat uint8
const (
HexNone = BitfieldFormat(iota)
HexLower
HexUpper
)
func BitfieldString[T ~uint8 | ~uint16 | ~uint32 | ~uint64](bitfield T, bitnames []string, cfg BitfieldFormat) string {
var out strings.Builder
switch cfg {
case HexNone:
// do nothing
case HexLower:
fmt.Fprintf(&out, "0x%0x(", uint64(bitfield))
case HexUpper:
fmt.Fprintf(&out, "0x%0X(", uint64(bitfield))
}
if bitfield == 0 {
out.WriteString("none")
} else {
rest := bitfield
first := true
for i := 0; rest != 0; i++ {
if rest&(1<<i) != 0 {
if !first {
out.WriteRune('|')
}
if i < len(bitnames) {
out.WriteString(bitnames[i])
} else {
fmt.Fprintf(&out, "(1<<%v)", i)
}
first = false
}
rest &^= 1 << i
}
}
if cfg != HexNone {
out.WriteRune(')')
}
return out.String()
}
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