Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!bellcore!flash!sdh
From: sdh@flash.bellcore.com (Stephen D Hawley)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Quick ThinkC String question...
Keywords: THINK C STRING
Message-ID: <20011@bellcore.bellcore.com>
Date: 14 Feb 90 15:40:33 GMT
References: <77108@tut.cis.ohio-state.edu>
Sender: news@bellcore.bellcore.com
Reply-To: sdh@flash.UUCP (Stephen D Hawley)
Distribution: usa
Organization: Bellcore, Morristown, NJ
Lines: 39

In article <77108@tut.cis.ohio-state.edu> <waylonis@cis.ohio-state.edu> writes:
>Hi,
>
>I'm having a problem getting ThinkC to accept the following:
>procedureX()
>{
>	Str255	myString;
>
>	myString = "\pExample string";
>}

Try:

procedureX()
{
	char *myString;

	myString = "\pExample string";
}

Str255 is an array type.  When you say "Str255 myString" you are actually
saying "create an array of 256 characters named myString".  When you do
the assignment, you are asking Think C to do a Pascal string copy at
runtime.  This is undefined behavior for arrays in C.

My example just does a pointer assignment.  Beware that myString is a
char * not an unsigned char *.  If you declare it as an unsigned char * you
will get a type clash, but if you don't you have to be sure to cast the first
byte to an unsigned char if you use it as a length (otherwise it'll get
sign extended).

Steve Hawley
sdh@flash.bellcore.com


A noun's a special kind of word.
It's ev'ry name you ever heard.
I find it quite interesting,
A noun's a person place or thing.