Re: Lua 5.1.3 bug in string.byte

["David Burgess" <dburgess@...>]

Interesting, compare -

#lua -e "for i=5,-10,-1 do print(i, string.sub('abc', i)) end"
5
4
3       c
2       bc
1       abc
0       abc
-1      c
-2      bc
-3      abc
-4      abc
-5      abc
-6      abc
-7      abc
-8      abc
-9      abc
-10     abc


and

#lua -e "for i=5,-10,-1 do print(i, string.byte('abc', i, 3)) end"
5
4
3       99
2       98      99
1       97      98      99
0       97      98      99
-1      99
-2      98      99
-3      97      98      99
-4      97      98      99
-5      97      98      99
-6      97      98      99
-7      97      98      99
-8      97      98      99
-9      97      98      99
-10     97      98      99

On Tue, Jun 3, 2008 at 9:37 AM, Mike Pall <mikelu-0806@mike.de> wrote:
> The range check logic in string.byte is broken:
>
> $ lua -e 'for i=5,-10,-1 do print(i, string.byte("abc", i)) end'
> 5
> 4
> 3       99
> 2       98
> 1       97
> 0
> -1      99
> -2      98
> -3      97
> -4
> -5      97      98      99  <--- Unexpected results for -#str-2 and lower
> -6      97      98
> -7      97
> -8
> -9      97      98      99
> -10     97      98      99
>
> --Mike
>



-- 
David Burgess