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documented argc/argv passing, added info about proper handling this information

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2328 b7a2c559-68d2-44c3-8de9-860c34a00d81
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izydorst 2003-08-15 20:06:33 +00:00
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doc/geos.sgml
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@ -162,6 +162,14 @@ series of <tt/lda/ and <tt/sta/, so you can't do it better :-).
Don't hesitate to use library functions. Everything was written with size and speed in mind. In
fact many calls are just redirections to GEOS kernal which results in simple <tt/jsr/.
<p>
The <tt/main/ function receives the standard <tt/argc/ and <tt/argv/ parameters. There are
always either 1 or 3 parameters. DOS application name is always set as <tt/argv[0]/.
If present, <tt/argv[1]/ and <tt/argv[2]/ will be set to data filename and data diskname (it only
works if user double-clicks on data file associated with your application). Note that it is up
to your application to determine which of the available (up to four) disk drives has the disk
with given diskname inside. If this fails your program should ask to insert the proper disk into
one of available drives.
<p>
You might wonder why I have chosen sometimes weird order of arguments in functions. I just
wanted to avoid unnecessary pushing and popping arguments from stack because cc65 can pass single
<tt/unsigned int/ through CPU registers.