Definition of isprint()

[Larry Jones]

We're using SAS C on an IBM mainframe and just ran into an
interesting problem.  SAS has defined "printing character" in
terms of what is printable on an ancient line printer so some
obviously printable characters such as "{", "}", "[", "]", "\",
and "!" cause isprint() to return 0!

Am I the only one who thinks this is less than useful?

The dpANS seems to allow this, since "printing character" is
implementation defined, but it seems to me that the C source
character set should be specified as printable in the "C" locale.
The problem seems to be that the exact semantics of ispunct() are
not specified for the "C" locale.

Was this an oversight or was it intentional?  I was there, but I
don't remember.

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