Add a word of caution about integer arithmetic range and overflow detection.

svn path=/head/; revision=92983
2002-03-22 20:46:59 +00:00 · 2002-03-22 20:46:59 +00:00 · 7316a9465e · 2020-12-20 02:59:44 +00:00
commit 7316a9465e
parent f477880a4f
1 changed files with 6 additions and 0 deletions
--- a/bin/expr/expr.1
+++ b/bin/expr/expr.1
@ -217,3 +217,9 @@ The
 .Nm
 utility conforms to
 .St -p1003.1-2001 .
+.Tn POSIX
+does not specify whether arithmetic overflow is detected, nor does it specify
+the possible range of integer arguments to
+.Nm ,
+so a portable application must assume that the range is small and that
+overflow may not be detected.