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#include <dos.h> int bdosptr(int func, void *ptr, unsigned al);
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
AL register and a pointer in
DX register. For
functions which require non-pointer arguments in the
bdos (see section 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). See section int86, for the list of supported functions.
Whatever the called function returns in the AX register.
/* print a string */ bdosptr(9, "Hello, there$", 0);
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