[patch, fortran] PR37746 Diagnostic of edit descriptors, esp. EN

[Jerry DeLisle]

Greetings,

The attached patch greatly improves the diagnostics for D, G, E, EN, ES 
format specifiers.  I added a simple helper function to convert the 
token to a string that can be used in error messages.

I also found that we were completely missing a check for the required 
format width.  This is now added in with the patch.  The overall error 
locus was improved by the patch to 41075.

Regression tested on X86-64 Linux.  Test case attached.

OK for trunk.

Regards,

Jerry

2009-08-22  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

     PR fortran/37446
     * io.c (enum format_token): Change FMT_EXT to FMT_EN and FMT_ES.
     (format_lex): Likewise.
     (token_to_string): New function.
     (check_format): Use the new tokens and the new function. Add
     check for positive width.
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