Re: sub() function do'nt alter string length in awk 3.1.5

[Aharon Robbins]

Hi. I think I may have replied to this, so apologies if this is a repeat.

First, this problem will go away if you use the "C" locale:

        export LC_ALL=C

I have this fixed in my current code base. If it's an urgen problem I can
try to generate a patch for you. Otherwise, it'll be fixed in the next release.

Thanks!

Arnold

> Date: Sun, 28 May 2006 11:20:58 +0200
> From: Frantisek Hanzlik <address@hidden>
> Subject: sub() function do'nt alter string length in awk 3.1.5
> To: address@hidden
>
> Hello,
> I not know when it is my mistake or gawk bug - in simple example below
> I delete some chars from string variable, and after this string is
> modified, but its length is unchanged.
>
> awk 'BEGIN{A="1234567890abcdef";
>   for (i=1;i<6;i++){print length(A),"A=" A ".";sub("....","",A)}
> }'
> 16 A=1234567890abcdef.
> 16 A=567890abcdef.
> 16 A=90abcdef.
> 16 A=cdef.
> 16 A=.
>
> When I use gensub() instead of sub(), result is as I expected:
>
> awk 'BEGIN{A="1234567890abcdef";
>   for (i=1;i<6;i++){print length(A),"A=" A ".";A=gensub("....","",1,A)}
> }'
> 16 A=1234567890abcdef.
> 12 A=567890abcdef.
> 8 A=90abcdef.
> 4 A=cdef.
> 0 A=.
>
> OS/GAWK versions:
> - GNU/Linux kernel 2.6.16-1.2122_FC5 #1 i686, Fedora Core 5 distro
> - glibc-2.4-8
> - GNU Awk 3.1.5
>
> Yours sincerely
> Frantisek Hanzlֳ­k
>
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