>Number:         25543
>Category:       bin
>Synopsis:       AWK's gensub(re,repl,N,src) mis-handles N.
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 12 10:39:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     Richard Rauch
>Release:        Pre-2.0 -current.
>Organization:
n/a
>Environment:
NetBSD odysseus 1.6ZK NetBSD 1.6ZK (odysseus) #1: Wed Mar 17 05:27:46 CST 2004  root@atlas:/usr/netbsd/current/src/sys/arch/i386/compile/obj.i386/odysseus i386
>Description:
I'm not sure if this has been fixed, but there's no outstanding bug-
report, and with 2.0 looming close I decided to fire off a bug report
before attempting to update my system.

echo "helloello" | awk '{print gensub ("ello","i",1,$0);}'

...prints "hiello" in GNU's gawk, but
   prints "helloi" in NetBSD's nawk.

I believe that gensub() is a GNUism, so gawk's handling is
presumably correct by definition.

>How-To-Repeat:
echo "helloello" | awk '{print gensub ("ello","i",1,$0);}'

>Fix:
My copy of userland sources should be quite recent, though my last
compile-and-install of userland was some time back.  If the above bug
still manifests, then I think you can fix it with this patch to
.../src/dist/nawk/run.c (+ for new, - for old), around line 1950:

        if (sptr[0] == 'g' || sptr[0] == 'G')
                whichm = -1;
        else
-               whichm = (int) getfval(h);
+               whichm = (int) getfval(h) + 1;
        tempfree(h);

        if (pmatch(pfa, t)) {

...(untested)
>Release-Note:
>Audit-Trail:
>Unformatted: