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bdosptr
=======

Syntax
------

     #include <dos.h>
     
     int bdosptr(int func, void *ptr, unsigned al);

Description
-----------

Calls function FUNC of the software interrupt 0x21, passing it AL as
the subfunction and a pointer to a copy of the buffer contents whose
address is in PTR through the `DX' register.  This function will only
work for a subset of DOS which require an argument in the `AL' register
and a pointer in `DX' register.  For functions which require
non-pointer arguments in the `DX' register, use `bdos' (bdos:.).   
To make the contents of PTR available to DOS, `bdosptr' copies it to
the transfer buffer located in the low (below 1 Meg mark) memory.

Currently, some of the functions which take a pointer to a buffer in
`DX' are *NOT* supported (notably, most of the FCB-based functions).
int86: for the list of supported functions.   

Return Value
------------

Whatever the called function returns in the AX register.

Example
-------

     /* print a string */
     bdos(9, "Hello, there$", 0);