Re: [cc65] C64: CKOUT followed by printf

On Freitag 03 Dezember 2010, you wrote:
> Can someone confirm that printf (on C64) selects the screen for
> output (as in, cbm_k_ckout(STDOUT) or similar) before outputting the
> text?  I inserted some debug messages without considering this...
> 
> I placed a (printf) debug message directly following a call to
> cbm_k_ckout(lfn_serial). What seemed to happen was the debug message
> went to the screen, and so did the character I sent after that using
> BSOUT, that was intended to go to the lfn_serial device.
> 
> Obviously what I did was in error, but the behavior seems to imply that
> printf always writes to the screen, and cannot not be used to send output
> to a logical file.  This would be a bit unfortunate, but I imagine
> sprintf() could be used as a workaround... ?

you can not mix calls to the posix standard functions and arch dependend stuff 
like the cbm_ functions. so yes, what you say is what happens :) if you want 
to "printf" to a file, use fopen and fprintf. (or well, hack your own stuff 
with sprintf if you like to reinvent the wheel =P)

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