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Subject[PATCH] highuid.h macro expansion
	Hi Linus,

This patch (from Andreas Schwab <schwab@suse.de>) makes macro expansion in
<linux/highuid.h> safer.

diff -urN linux-2.4.0-test11/include/linux/highuid.h geert-2.4.0-test11/include/linux/highuid.h
--- linux-2.4.0-test11/include/linux/highuid.h Sun Nov 19 05:56:59 2000
+++ geert-2.4.0-test11/include/linux/highuid.h Tue Nov 21 13:20:57 2000
@@ -41,14 +41,14 @@
#ifdef CONFIG_UID16

/* prevent uid mod 65536 effect by returning a default value for high UIDs */
-#define high2lowuid(uid) ((uid) > 65535) ? (old_uid_t)overflowuid : (old_uid_t)(uid)
-#define high2lowgid(gid) ((gid) > 65535) ? (old_gid_t)overflowgid : (old_gid_t)(gid)
+#define high2lowuid(uid) ((uid) > 65535 ? (old_uid_t)overflowuid : (old_uid_t)(uid))
+#define high2lowgid(gid) ((gid) > 65535 ? (old_gid_t)overflowgid : (old_gid_t)(gid))
/*
* -1 is different in 16 bits than it is in 32 bits
* these macros are used by chown(), setreuid(), ...,
*/
-#define low2highuid(uid) ((uid) == (old_uid_t)-1) ? (uid_t)-1 : (uid_t)(uid)
-#define low2highgid(gid) ((gid) == (old_gid_t)-1) ? (gid_t)-1 : (gid_t)(gid)
+#define low2highuid(uid) ((uid) == (old_uid_t)-1 ? (uid_t)-1 : (uid_t)(uid))
+#define low2highgid(gid) ((gid) == (old_gid_t)-1 ? (gid_t)-1 : (gid_t)(gid))

/* Avoid extra ifdefs with these macros */

@@ -67,13 +67,13 @@

#define SET_UID16(var, uid) do { ; } while (0)
#define SET_GID16(var, gid) do { ; } while (0)
-#define NEW_TO_OLD_UID(uid) uid
-#define NEW_TO_OLD_GID(gid) gid
+#define NEW_TO_OLD_UID(uid) (uid)
+#define NEW_TO_OLD_GID(gid) (gid)

-#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = uid
-#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = gid
-#define SET_STAT_UID(stat, uid) (stat).st_uid = uid
-#define SET_STAT_GID(stat, gid) (stat).st_gid = gid
+#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = (uid)
+#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = (gid)
+#define SET_STAT_UID(stat, uid) (stat).st_uid = (uid)
+#define SET_STAT_GID(stat, gid) (stat).st_gid = (gid)

#endif /* CONFIG_UID16 */

@@ -97,10 +97,10 @@
* Since these macros are used in architectures that only need limited
* 16-bit UID back compatibility, we won't use old_uid_t and old_gid_t
*/
-#define fs_high2lowuid(uid) (uid > 65535) ? (uid16_t)fs_overflowuid : (uid16_t)uid
-#define fs_high2lowgid(gid) (gid > 65535) ? (gid16_t)fs_overflowgid : (gid16_t)gid
+#define fs_high2lowuid(uid) ((uid) > 65535 ? (uid16_t)fs_overflowuid : (uid16_t)(uid))
+#define fs_high2lowgid(gid) ((gid) > 65535 ? (gid16_t)fs_overflowgid : (gid16_t)(gid))

-#define low_16_bits(x) x & 0xFFFF
-#define high_16_bits(x) (x & 0xFFFF0000) >> 16
+#define low_16_bits(x) ((x) & 0xFFFF)
+#define high_16_bits(x) (((x) & 0xFFFF0000) >> 16)

#endif /* _LINUX_HIGHUID_H */
Gr{oetje,eeting}s,
Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

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