[Bug 15051] New: [PATCH] Awk: fix bitwise functions result/arguments truncation on 32bit platforms

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15051

            Bug ID: 15051
           Summary: [PATCH] Awk: fix bitwise functions result/arguments
                    truncation on 32bit platforms
           Product: Busybox
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: caribpa at outlook.com
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

Created attachment 9386
  --> https://bugs.busybox.net/attachment.cgi?id=9386&action=edit
awk-bitwise-fix-arch32.patch

Hi!

On platforms that use 32bit longs data is lost when performing bitwise
operations if the result and/or arguments are equal-to/greater-than 2^32.

This behavior is unexpected as Busybox Awk numbers are doubles[1] (typically up
to 2^53) and this issue is not present on GNU Awk.

Example 1 - Result equal-to/greater-than 2^32:

  awk 'BEGIN{print lshift(1, 32)}'

It returns 1, instead of the expected 4294967296.


Example 2 - Arguments equal-to/greater-than 2^32:

  awk 'BEGIN{print and(2^32, 2^32)}'

It returns 0, instead of the expected 4294967296.


The patch attached simply changes the castings and type of the getvar_i_int
function from long to long long.

Note that the patch found in bug 15036[3] adds two functions that
operate/return long numbers that shall also be changed into long long when
accepted.

Cheers,
Carlos


[1] -
https://git.busybox.net/busybox/tree/editors/awk.c?id=c8c1fcdba163f264a503380bc63485aacd09214c#n123
[2] -
https://git.busybox.net/busybox/tree/editors/awk.c?id=c8c1fcdba163f264a503380bc63485aacd09214c#n1048
[3] - https://bugs.busybox.net/show_bug.cgi?id=15036

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