handy.h: clarify, typos in comment

diff --git a/handy.h b/handy.h
index 5e30512..3f04b56 100644 (file)
--- a/handy.h
+++ b/handy.h
@@ -562,15 +562,16 @@ patched there.  The file as of this writing is cpan/Devel-PPPort/parts/inc/misc
 
 */
 
-/* FITS_IN_8_BITS(c) returns true if c occupies no more than 8 bits.  It is
- * designed to be hopefully bomb-proof, making sure that no bits of
- * information are lost even on a 64-bit machine, but to get the compiler to
- * optimize it out if possible.  This is because Configure makes sure that the
- * machine has an 8-bit byte, so if c is stored in a byte, the sizeof()
- * guarantees that this evaluates to a constant true at compile time.  The use
- * of the mask instead of '< 256' keeps gcc from complaining that it is alway
- * true, when c's storage class is a byte.  Use U64TYPE because U64 is known
- * only in the perl core, and this macro can be called from outside that */
+/* FITS_IN_8_BITS(c) returns true if c doesn't have  a bit set other than in
+ * the lower 8.  It is designed to be hopefully bomb-proof, making sure that no
+ * bits of information are lost even on a 64-bit machine, but to get the
+ * compiler to optimize it out if possible.  This is because Configure makes
+ * sure that the machine has an 8-bit byte, so if c is stored in a byte, the
+ * sizeof() guarantees that this evaluates to a constant true at compile time.
+ * The use of the mask instead of '< 256' keeps gcc from complaining that it is
+ * always true, when c's storage class is a byte.  Use U64TYPE because U64 is
+ * known only in the perl core, and this macro can be called from outside that
+ */
 #ifdef HAS_QUAD
 #  define FITS_IN_8_BITS(c) ((sizeof(c) == 1) || (((U64TYPE)(c) & 0xFF) == (U64TYPE)(c)))
 #else