[MacRuby-devel] [MacRuby] #159: "%d" with large integer argument gives conversion error

MacRuby ruby-noreply at macosforge.org
Tue Nov 11 11:11:44 PST 2008


#159: "%d" with large integer argument gives conversion error
---------------------------------+------------------------------------------
 Reporter:  jamis at 37signals.com  |       Owner:  lsansonetti at apple.com
     Type:  defect               |      Status:  new                  
 Priority:  major                |   Milestone:                       
Component:  MacRuby              |    Keywords:                       
---------------------------------+------------------------------------------
 The following script reproduces the error easily:

 {{{
 N = 34363859232
 p N
 p N.class

 puts "%d" % N
 }}}

 This results in the following exception:

 {{{
 01.rb:5:in `%': integer 34363859232 too big to convert to `int'
 (RangeError)
 }}}

 When run in ruby 1.9, the output shows that N is a Bignum. When run in
 macruby, the output shows that N is a fixnum. This appears to be due to
 bignum.c line 523:

 {{{
     if (len <= (sizeof(long)*CHAR_BIT)) {
 }}}

 Apparently, in macruby, sizeof(long) is 8, which means bignums are only
 instantiated for integers larger than 64 bits or so, and in the above
 example, the integer is only 44 bits.

 Even though the bignums are only created based on sizeof(long), the
 rb_str_format function in sprintf.c uses FIX2LONG for converting the VALUE
 to a long int, and FIX2LONG uses INT_MIN and INT_MAX to check the bounds
 of the integer.

 I'm not sure what the safest way to fix this is. Should check_int (and
 others?) in numeric.c be comparing against larger boundary numbers,
 instead of INT_MIN/MAX?

-- 
Ticket URL: <http://www.macruby.org/trac/ticket/159>
MacRuby <http://macruby.org/>



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