Re: Calc; Fix c type hex parse on `quick-calc'

[Eli Zaretskii]

> From: OGAWA Hirofumi <address@hidden>
> Date: Fri, 10 Nov 2017 03:31:00 +0900
> 
> This bug is reproducible with following commands.
> 
> $ emacs -Q
> M-: (setq calc-language 'c)
> M-x quick-calc
> 
> Quick calc: 1024 + 0x20
> Result: 32 =>  32  (0x20, 040, 2#100000, " ")
> 
> Like above, the result is wrong (expected result is following).
> Result: 1024 + 32 =>  1056  (0x420, 02040, 2#10000100000)
> 
> The bug is in `math-read-token'.
> 
>      (or (and (memq calc-language calc-lang-c-type-hex)
>             (string-match "0[xX][0-9a-fA-F]+" math-exp-str math-exp-pos))
> 
> We want to get "1024" as token at first, but the above part matches at
> "0x20" part of expr, and skips "1024 + ".
> 
> In this context, we want to check if current token is matching to
> c-type hex or not. So we should check regex is matched at
> math-exp-pos. This patch fixes this bug.

Thanks, I installed your changes.