Redirection question

[Roberto Armenti]

Hi net-people,

perhaps someone out there can help me.

Is there a _portable_ way to recognize whether input comes from
stdin or from another stream ?
To make the problem clearer : i'm working on a programm that takes
its input from stdin. If however someone chooses to redirect the input
to a file, so that data is read from that file, how can I figure that
out ( Prompting and so on should not occur in this case ) ???

The solution should at least work on UNIX _AND_ MS-DOS, so i'm looking for
a _portable_ implementation.
Help out there ?
	Thanks in advance
		Roberto




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