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From: beard@ux5.lbl.gov (Patrick C Beard)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Question on MPW 3.1 assembly
Message-ID: <8908@dog.ee.lbl.gov>
Date: 8 Jan 91 08:49:18 GMT
References: <1991Jan8.062852.4007@engage.enet.dec.com>
Reply-To: beard@ux5.lbl.gov (Patrick C Beard)
Organization: Berkeley Systems, Inc.
Lines: 49
X-Local-Date: Tue, 8 Jan 91 00:49:18 PST

In article <1991Jan8.062852.4007@engage.enet.dec.com> domenikos@emass.enet.dec.com (George Domenikos) writes:

#What is the syntax for exporting an MPW 3.1 assembly routine to MPW C modules.
#
#I am having something like this
#; myassembly.a
#
#myassembly_routine 	PROC EXPORT
#	.........                 ;more code here
#	ENDP
#

Your link problem is due to the fact that MPW C (and most C compilers) is
case sensitive, and by default MPW Assembly is not.  Use the "CASE ON"
directive before your assembly code and things will link.  i.e., add the line:

	CASE ON		; so C can link to us.

#Question #2
#How can I make a global variable defined say in myinclude.h 
#as follows :
#
#extern char GLOBAL_TABLE[50];
#
#visible to
#myassembly routine and change its contents in the assembly routine?
#Do I have to use IMPORT in the assembly for that.

Yes, plus see above.

#Question #3
#Does any body know if a device driver written in Think C can be accessed
#by an application written in MPW Pascal. Personally I am having problems.
#It seems that they are using different addressing conventions. For instance
#an address to some storage data returned by the driver translates to
#an address containig garbage from MPW pascals perspective. Am I right?

This shouldn't be a problem.  However, you have to be careful how you return
this data, as driver call glue can mess things up.  You should, if possible,
always use PBControl/PBStatus, etc. calls so you can pass the actual param
block and control what the driver sees.  Glue will often mess you up.

Hope this helps.

--
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-  Patrick Beard, Macintosh Programmer                        (beard@lbl.gov) -
-  Berkeley Systems, Inc.  ".......<dead air>.......Good day!" - Paul Harvey  -
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