[cc65] CBM POSIX I/O w/o O_TRUNC ?

Hi,

I want to change just the first few bytes of a longer file. From the
POSIX docs (and my experience in other environments) learned that I
can do so simply by omitting O_TRUNC (and O_CREAT) like this:

int f = open("myfile", O_WRONLY);
write(f, mybuffer, mysize);
close(f);

From what I've heard so far the CBM sequential files have some
limitations. Therefore I'd like to know if I can presume the code
above to behave as decribed.

You may ask: Why isn't he just trying? I've learned that the CBM DOS
livs in the drives so I could i.e. imagine the code above working on
one drive, but not the other - or any other isse that I don't
recognize in a simple test.

So thanks in advance for your help, Oliver
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