* A few cleanups, and 3.77.94 release.3.77.94

1 files changed, 11 insertions, 0 deletions

diff --git a/make.h b/make.h
index b25318b..a50334f 100644
--- a/make.h
+++ b/make.h
@@ -299,6 +299,17 @@ extern char *alloca ();
 # endif /* HAVE_ALLOCA_H.  */
 #endif /* GCC.  */
 
+/* ISDIGIT offers the following features:
+   - Its arg may be any int or unsigned int; it need not be an unsigned char.
+   - It's guaranteed to evaluate its argument exactly once.
+      NOTE!  Make relies on this behavior, don't change it!
+   - It's typically faster.
+   Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
+   only '0' through '9' are digits.  Prefer ISDIGIT to isdigit() unless
+   it's important to use the locale's definition of `digit' even when the
+   host does not conform to Posix.  */
+#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
+
 #ifndef iAPX286
 # define streq(a, b) \
    ((a) == (b) || \