From: Ralf Papenkordt <ralf.papenkordt@...>
Date: 2010-08-22T06:44:59+09:00
Subject: Re: 1.9.2 breaks ncurses (STR2CSTR) - pls help

R.. Kumar 1.9.1 OSX wrote:
> I've tried various combinations. I either get runtime errors relating to 
> rb_str2ctr or just make errors.
> 
> 1. $ perl -p -i.b -e 's/STR2CSTR/StringValuePtr/g' *.c
>    $ make
> 
> form_wrap.c: In function ‘rbncurs_c_set_field_type’:
> form_wrap.c:626: error: lvalue required as unary ‘&’ operand
> form_wrap.c: In function ‘rbncurs_c_set_field_fore’:
> form_wrap.c:698: warning: implicit conversion shortens 64-bit value into 
> a 32-bit value
> form_wrap.c: In function ‘rbncurs_c_set_field_back’:
> form_wrap.c:712: warning: implicit conversion shortens 64-bit value into 
> a 32-bit value
> form_wrap.c: In function ‘make_arg’:
> form_wrap.c:1134: warning: format not a string literal and no format 
> arguments
> make: *** [form_wrap.o] Error 1

Unfortunately replacing STR2CSTR with StringValuePtr is not enough as 
outlined in 
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/105048. You 
have to make two additional changes:

$ diff form_wrap.c form_wrap.c.b
626,627c626
<       VALUE tmp = rb_ary_entry(arg3, (long)i);
<       list[i] = StringValuePtr(tmp);
---
>       list[i] = STR2CSTR(rb_ary_entry(arg3, (long)i));
...

and

$ diff ncurses_wrap.c ncurses_wrap.c.b
...
2244,2245d2243
<     VALUE tmp = rb_funcall3(rb_mKernel, rb_intern("sprintf"), argc-1,
<                               argv + 1);
2247c2245,2246
<             (VALUE)StringValuePtr(tmp));
---
>             STR2CSTR(rb_funcall3(rb_mKernel, rb_intern("sprintf"), argc-1,
>                               argv + 1)));
...

Then run

make
make install

within the installed ncurses gem. After these changes I was able to run 
the 2 testcases test1.rb and test2.rb of rbcurse-1.1.3.

ruby test1.rb
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