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From: mpatnode@polyslo.UUCP (Mike Patnode)
Newsgroups: comp.lang.c,comp.sys.ibm.pc
Subject: MSC toupper (was  Re: MS-DOS NRO )
Message-ID: <348@polyslo.UUCP>
Date: Tue, 26-May-87 00:41:16 EDT
Article-I.D.: polyslo.348
Posted: Tue May 26 00:41:16 1987
Date-Received: Fri, 29-May-87 06:29:16 EDT
References: <405@ritcv.UUCP> <725@thumper.UUCP> <345@polyslo.UUCP> <2065@husc6.UUCP>
Reply-To: mpatnode@polyslo.UUCP (Mike Patnode)
Distribution: na
Organization: Cal Poly State Univ,CSC Dept,San Luis Obispo,CA 93407
Lines: 24
Keywords: NRO
Summary: toupper is a macro!
Xref: mnetor comp.lang.c:2238 comp.sys.ibm.pc:4371

In article <2065@husc6.UUCP> ddl@husc6.UUCP (Dan Lanciani) writes:
>In article <345@polyslo.UUCP>, mpatnode@polyslo.UUCP (Mike Patnode) writes:
>> 		toupper(p++)
>> 	This is a BIG NO-NO since toupper is actually a macro which
>> 	evaluates it's arguments 3 times!!!!!
>
>	Not quite.  This is a no-no, but for a different reason.  The macros
>toupper and tolower do not evaluate their arguments more than once.  (At
>least on BSD and MSC 4.0 and other "compatible" systems.)  In order to
>avoid multiple eveluation, these macros do NOT check that their arguments
>are suitable.
	Well Dan this is straight out of my ctype.h:

#define toupper	((isupper(c)) ? _tolower(c) : (c))

      Upon closer evaluation I now see the argument is only evaluated 2
      times.  But this was with MSC 3.00 so 4.0 may have change.

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