[bug-gawk] Variable issue substr

[Filimonov Vadim]

Hello!

 

There is some issue with using variables after substr.

 

Good case:

 

gawk 'BEGIN {a="2345";b="678";a1=substr(a,length(a),1);b1=substr(b,length(b),1);print a1,b1;for (i=a1;i<=b1;i++){print i}}'
5 8
5
6
7
8

Bad Case:

 

gawk 'BEGIN {a="2345";b="6789";a1=substr(a,length(a),1);b1=substr(b,length(b),1);print a1,b1;for (i=a1;i<=b1;i++){print i}}'
5 9
5
6
7
8
9
10
...

89

 

Another good case:

 

gawk 'BEGIN {a="2345";b="6789";a1=substr(a,length(a),1);b1=substr(b,length(b),1);print a1,b1;if (b1==9){b1=9};for (i=a1;i<=b1;i++){print i}}'
5 9
5
6
7
8
9

I didn't found anything unexpected in variable b1 after substr, so it should be recognized as 9, i think.

I'm rinning Ubuntu 14.04.2 LTS 3.13.0-52-generic

gawk --version
GNU Awk 4.0.1