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In article <74@qmsseq.imagen.com>, pipkins@qmsseq.imagen.com (Jeff Pipkins) wrote:
}Incidently, the command tail is not parsed by c0?.obj, but by a function
}that it calls.  I don't remember its name right now.  Same goes for MSC,
}the name is setargv() I think.  You can link in your own version of this
}function if you want.  The command tail is stored in the program's PSP
}at offset 80h.  MSC has a global _psp that has the segment address of
}the PSP.  { char far *p;  FP_SEG(p) = _psp; FP_OFF(p) = 0x80; }

TurboC also uses setargv() and _psp.

}The byte at 80h has the length of the string, which actually starts at
}81h.  The first byte (at 81h) is always a blank, and the string always
}has a 0x0D byte at the end.

81h is *not* always a blank.  If you type
       FOO/X
the command tail FOO is passed at 80h is
       02h "/" "X" 0Dh
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"How to Prove It" by Dana Angluin              Disclaimer? I claimed something?
17. proof by mutual reference:
    In reference A, Theorem 5 is said to follow from Theorem 3 in reference B,
    which is shown to follow from Corollary 6.2 in reference C, which is an
    easy consequence of Theorem 5 in reference A.