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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Trouble with curses
Message-ID: <14400@smoke.brl.mil>
Date: 9 Nov 90 07:05:10 GMT
References: <1990Oct27> <20900012@inmet> <1990Nov7.194154.6071@ssd.kodak.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 9

In article <1990Nov7.194154.6071@ssd.kodak.com> weimer@ssd.kodak.com (Gary Weimer) writes:
-ANSI complient definition of tolower() does call islower() before
-making the conversion. In this case, the code "expands" to:
-    switch(islower(getch()) ? tolower(getch()) : (getch())) {
-Note that you are now always making two calls to getch() (as someone
-has already pointed out is a possibility).

While an implementation may evaluate the argument twice, it is definitely
not conformant to the ANSI C standard if it does.