[src/trunk]: src/bin/csh add Will Robinson comment.

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8618692f7f95
branches:  trunk
changeset: 344203:8618692f7f95
user:      christos <christos%NetBSD.org@localhost>
date:      Wed Mar 16 22:35:44 2016 +0000

description:
add Will Robinson comment.

diffstat:

 bin/csh/exec.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 553758a26bb1 -r 8618692f7f95 bin/csh/exec.c
--- a/bin/csh/exec.c    Wed Mar 16 22:32:32 2016 +0000
+++ b/bin/csh/exec.c    Wed Mar 16 22:35:44 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: exec.c,v 1.30 2016/03/16 22:25:05 christos Exp $ */
+/* $NetBSD: exec.c,v 1.31 2016/03/16 22:35:44 christos Exp $ */
 
 /*-
  * Copyright (c) 1980, 1991, 1993
@@ -34,7 +34,7 @@
 #if 0
 static char sccsid[] = "@(#)exec.c     8.3 (Berkeley) 5/23/95";
 #else
-__RCSID("$NetBSD: exec.c,v 1.30 2016/03/16 22:25:05 christos Exp $");
+__RCSID("$NetBSD: exec.c,v 1.31 2016/03/16 22:35:44 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -90,6 +90,7 @@
 static unsigned char xhash[HSHSIZ / 8];
 
 #define hash(a, b) (((a) * HSHMUL + (b)) & HSHMASK)
+/* these macros eval their arguments multiple times, so be careful */
 #define bit(h, b) ((h)[(b) >> 3] & 1 << ((b) & 7))     /* bit test */
 #define bis(h, b) ((h)[(b) >> 3] = \
     (unsigned char)((1 << ((b) & 7)) | (h)[(b) >> 3]))/* bit set */