work around buggy S_ISxxx(m) implementations

There are buggy implementations of S_ISxxx(m) macros on some platforms
(e.g. NetBSD).  The issue is that NetBSD doesn't take care to wrap its
macro arguments in parentheses, so on Linux and sane systems we have
S_ISREG(m) defined as something like:

(((m) & S_IFMT) == S_IFREG)

But on NetBSD:

((m & _S_IFMT) == _S_IFREG)

Since a caller in builtin/diff.c called our macro as `S_IFREG | 0644'
this bug introduced a logic error on NetBSD, since the precedence of
bit-wise & is higher than | in C.

[jc: took change description from Ævar Arnfjörð Bjarmason's patch]

Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/cache.h b/cache.h
index 2ef2fa3a5e166d94e5e981ca7c76afad13236e7e..3d5ed51989d6c118062c0709eae41fcb3cc6543b 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -277,9 +277,16 @@ static inline int ce_to_dtype(const struct cache_entry *ce)
        else
                return DT_UNKNOWN;
 }
-#define canon_mode(mode) \
-       (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
-       S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
+static inline unsigned int canon_mode(unsigned int mode)
+{
+       if (S_ISREG(mode))
+               return S_IFREG | ce_permissions(mode);
+       if (S_ISLNK(mode))
+               return S_IFLNK;
+       if (S_ISDIR(mode))
+               return S_IFDIR;
+       return S_IFGITLINK;
+}
 
 #define flexible_size(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
 #define cache_entry_size(len) flexible_size(cache_entry,len)