Re: [PATCH] IBM z/OS + EBCDIC support

[Paul Eggert]

> > Code that
> > uses c-ctype wants only ASCII letters, and departing from this would
> > likely break things.
>
> How would that match occur? c_isalpha() was/is using a "switch"
> statement for EBCDIC.

Oh, sorry, I was assuming that the substitution was being proposed for all the 
functions; but it's being proposed only for c_isascii, c_iscntrl, c_isgraph, 
c_isprint, and c_ispunct.  These functions are so rarely used that it probably 
doesn't matter that much what we do....

> If the user builds in one locale and runs in another, they're going to
> have bigger problems (e.g. garbled program messages). As far as I've
> seen, this is considered "out of bounds" in z/OS usage.

Excellent; that simplifies things.

> A different code page at run time, I think, is not feasible. But
> international users will at least want a different code page at
> compile time.
>
> A simple program could generate tables for all the isxxxxx() functions
> (see below) at compile time. Would you be inclined to do it that way?

I think we can do it without that kind of compile-time hassle, if we can assume 
that the compile-time locale is the same as the run-time.  I installed the 
attached patch, which makes that assumption, and which I hope does the right thing.

0001-c-ctype-support-EBCDIC-style-c_isascii.patch
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