[Bug 5108] New: awk uses updated FS too early

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=5108

           Summary: awk uses updated FS too early
           Product: Busybox
           Version: 1.19.x
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Standard Compliance
        AssignedTo: unassigned at busybox.net
        ReportedBy: dubiousjim at gmail.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


BusyBox 1.19.3, built against uClibc 0.9.32, on i686 Linux

The POSIX-2008 standard says that changing FS should have no effect on the
current input line, but only on the next one. The language is:

> Before the first reference to a field in the record is evaluated, the record
> shall be split into fields, according to the rules in Regular Expressions,
> using the value of FS that was current at the time the record was read. 

(Supposedly, this requirement was introduced as far back as 1996.) BusyBox awk
doesn't conform to this requirement: if no fields have yet been referenced, the
new value of FS will be used also for parsing the current line.


For example. POSIX requires that this:
$ printf 'a:b c:d\ne:f g:h' | awk '{FS=":"; print $1}'
should print:
a:b
e

and that is indeed the behavior of gawk. But BusyBox awk prints:
a
e

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