From 5c01edd69a20396eb63396437c55e26c6bf3deb7 Mon Sep 17 00:00:00 2001
From: krw <krw@openbsd.org>
Date: Fri, 6 May 2022 14:22:49 +0000
Subject: [PATCH] When printing the GPT table, display "Microsoft basic data"
 instead of "FAT12" for partition types that are mapped to GPT_UUID_MSDOS.

No intentional functional change.
---
 sbin/fdisk/part.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/sbin/fdisk/part.c b/sbin/fdisk/part.c
index b98756ef0c3..1a01d5b4113 100644
--- a/sbin/fdisk/part.c
+++ b/sbin/fdisk/part.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: part.c,v 1.125 2022/05/03 11:48:47 krw Exp $	*/
+/*	$OpenBSD: part.c,v 1.126 2022/05/06 14:22:49 krw Exp $	*/
 
 /*
  * Copyright (c) 1997 Tobias Weingartner
@@ -457,21 +457,26 @@ const char *
 PRT_uuid_to_typename(const struct uuid *uuid)
 {
 	static char		 typename[UUID_STR_LEN + 1];
+	const uint8_t		 gpt_uuid_msdos[] = GPT_UUID_MSDOS;
+	struct uuid		 uuid_msdos;
 	const struct gpt_type	*gt;
 	char			*uuidstr;
 	uint32_t		 status;
 
-	memset(typename, 0, sizeof(typename));
+	uuid_dec_be(gpt_uuid_msdos, &uuid_msdos);
+	if (uuid_compare(&uuid_msdos, uuid, NULL) == 0)
+		return "Microsoft basic data";
 
 	gt = find_gpt_type(uuid);
-	if (gt == NULL) {
-		uuid_to_string(uuid, &uuidstr, &status);
-		if (status == uuid_s_ok)
-			strlcpy(typename, uuidstr, sizeof(typename));
-		free(uuidstr);
-	} else {
-		strlcpy(typename, gt->gt_sname, sizeof(typename));
-	}
+	if (gt != NULL)
+		return gt->gt_sname;
+
+	uuid_to_string(uuid, &uuidstr, &status);
+	if (status == uuid_s_ok)
+		strlcpy(typename, uuidstr, sizeof(typename));
+	else
+		typename[0] = '\0';
+	free(uuidstr);
 
 	return typename;
 }
-- 
2.20.1