>From: Joel Fritz <JFritz@sharperimage.com>
>Date: Wed, 23 Jan 2002 13:37:49 -0800
>If I recall, isalpha() tests one character at a time.
>I think the prototype should look something like this (I didn't test it):
>     d isalpha         pr            10i 0 extproc('isalpha')
>     d  testchar                      1    value

That seems sensible, but the other prototype was correct.  The
C prototype is
  int isalpha (int);
But even if the C prototype were this
  int isalpha (char c);
your prototype wouldn't be correct for RPG because of 2 things:
1. C thinks "char" is an integer type, RPG doesn't
2. C thinks "char" is a 4-byte integer type, when it comes to
   parameter passing, and RPG thinks it's 1 byte

The V5R1 EXTPROC(*CWIDEN) can handle these problems for you.
Otherwise, you need to jump through some hoops.  (See the URL
I posted in my previous "isalpha" post.)

Barbara Morris

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