Pack bug on 64-bit ruby

ruby-talk
1

Hi all,

Solaris 9

/opt/bin/ruby -v
ruby 1.8.1 (2003-10-31) [sparc-solaris2.9]

file /opt/bin/ruby
/opt/bin/ruby: ELF 64-bit MSB executable SPARCV9 Version 1, UltraSPARC1
Extensions Required, dynamically linked, not stripped

Looks like there’s a 64-bit related bug in pack():

irb(main):007:0> [-1].pack(“V”)
RangeError: integer 18446744073709551615 too big to convert to unsigned int' from (irb):7:in pack’
from (irb):7

Regards,

Dan

2

Daniel Berger wrote:

Looks like there’s a 64-bit related bug in pack():

irb(main):007:0> [-1].pack(“V”)
RangeError: integer 18446744073709551615 too big to convert to unsigned int' from (irb):7:in pack’
from (irb):7

If Array#pack is supposed to output a four-character string for the
unsigned long value, I think maybe this shouldn’t work for 64-bit.
You’re passing in a value of -1, which is 2**64 - 1 when represented as
an unsigned long on a 64-bit machine. You can’t pack that into four
characters (bytes).

Out of curiosity, what happens if you instead try this?

 [-1].pack("L_")

Note the trailing underscore. If I read the code right, this should do
the right thing.