From 27401b6ea459921a6152ab1744da1618358465f4 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sun, 10 Jul 2022 13:18:30 -0600
Subject: Rename the module, mv pkg lib

---
 lib/util/bitfield.go | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 lib/util/bitfield.go

(limited to 'lib/util/bitfield.go')

diff --git a/lib/util/bitfield.go b/lib/util/bitfield.go
new file mode 100644
index 0000000..23da17a
--- /dev/null
+++ b/lib/util/bitfield.go
@@ -0,0 +1,50 @@
+package util
+
+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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