wow

1 files changed, 31 insertions, 0 deletions

diff --git a/pkg/util/bitfield.go b/pkg/util/bitfield.go
new file mode 100644
index 0000000..5e2ba06
--- /dev/null
+++ b/pkg/util/bitfield.go
@@ -0,0 +1,31 @@
+package util
+
+import (
+	"fmt"
+	"strings"
+)
+
+func BitfieldString[T ~uint8 | ~uint16 | ~uint32 | ~uint64](bitfield T, bitnames []string) string {
+	var out strings.Builder
+	fmt.Fprintf(&out, "0x%0X", uint64(bitfield))
+	if bitfield == 0 {
+		out.WriteString("(none)")
+	} else {
+		rest := bitfield
+		sep := '('
+		for i := 0; rest != 0; i++ {
+			if rest&(1<<i) != 0 {
+				out.WriteRune(sep)
+				if i < len(bitnames) {
+					out.WriteString(bitnames[i])
+				} else {
+					fmt.Fprintf(&out, "(1<<%d)", i)
+				}
+				sep = '|'
+			}
+			rest &^= 1 << i
+		}
+		out.WriteRune(')')
+	}
+	return out.String()
+}