Re: FW: Missing strtoull()...: long long standard

[Fergus Henderson <fjh at cs dot mu dot OZ dot AU>]

On 19-Jul-1998, root <root@jacob.remcomp.fr> wrote:
> As to strtoll, my system uses atoll, what should be equivalent...
> It is not that complicated actually...
> 
> Here it is:
> ----------------------------------------------------- strtoll.c-----------
> long long _strtoll(char *str)
> {
>         long long result = 0;
>         int negative=0;
> 
>         while (*str == ' ' || *str == '\t')
>                 str++;
>         if (*str == '+')
>                 str++;
>         else if (*str == '-') {
>                 negative = 1;
>                 str++;
>         }
> 
>         while (*str >= '0' && *str <= '9') {
>                 result = (result*10)+(*str++ - '0');
>         }
>         return negative ? -result : result;
> }

That version is buggy; it won't handle the most negative number correctly.

I think changing the last few lines to
	
                 result = (result*10) - (*str++ - '0');
         }
         return negative ? result : -result;

should fix the bug.

-- 
Fergus Henderson <fjh@cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh@128.250.37.3        |     -- the last words of T. S. Garp.
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