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From: turner@imagen.UUCP
Newsgroups: comp.sys.atari.st
Subject: Re: Question on Exec with Lattice C
Message-ID: <878@imagen.UUCP>
Date: Mon, 16-Feb-87 14:23:29 EST
Article-I.D.: imagen.878
Posted: Mon Feb 16 14:23:29 1987
Date-Received: Tue, 17-Feb-87 21:31:55 EST
References: <852@laidbak.UUCP>
Organization: The Houses of the Holy
Lines: 68

in article <852@laidbak.UUCP>, tm@laidbak.UUCP (Takis Mercouris) says:
> 
> Also, I looked in some usenet code (I think stmake) and the author seemed to
> be encoding the length of the tail in its first byte. However, this is not
> documented neither in my Lattice C manual (of course), nor in the Abacus
> internals. 

undocumented as it may be, it's correct. the length of the tail must
be the first byte of the tail `string`, also the max length of the
tail is 127 bytes (0x7f) for example

char command[128],env[128],tail[128];   /* these could be pointers and */
					/* the exact amount of storage */
					/* malloc'd                    */

strcpy(command,"d:\\bin\\emacs");	/* command                     */
env = NULL;				/* inherit the parent's env    */
strcpy(tail," @d:emacs.rc myfile.txt"); /* note the leading blank      */
tail[0] = 22;				/* length of tail              */
ierr = Pexec(0,command,tail,env);	/* 0 mode - load and go        */
.
.
.

> 
> Finally, is the Abacus function number $4B for exec correct?
> 
Yes it is
> Any sample program, clue, hint will be greatly appreciated
see above, just for the heck of it here's the mode table:

---------------------------------------------------------
|                                                       |
|______mode_________ptr1________ptr2__________ptr3______|
| 0 = load and go |   file  |  command  |  environment  |
|                 | to exec |    tail   |     string    |
---------------------------------------------------------
| 3 = load, no go |   file  |  command  |  environment  |
|                 | to load |    tail   |     string    |
---------------------------------------------------------
| 4 = just go     | basepage| (unused)  |   (unused)    |
|                 | address |           |               |
---------------------------------------------------------
| 5 = create      | (unused)|  command  |  environment  |
|     basepage    |         |    tail   |     string    |
---------------------------------------------------------

the environment string is either NULL or a pointer to series of
NULL terminated strings of the form:

	string1\0
	string2\0
	   .
	   .
	stringn\0
	  \0

if you need any more info, i suggest you get the dev kit..

(quick, duck! incoming flames)



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