On 15-09-17 11:34 AM, Matthieu Moy wrote:
> Marc Branchaud <[email protected]> writes:
>
>>> --- a/git-compat-util.h
>>> +++ b/git-compat-util.h
>>> @@ -814,6 +814,9 @@ static inline int strtoul_ui(char const *s, int base,
>>> unsigned int *result)
>>> char *p;
>>>
>>> errno = 0;
>>> + /* negative values would be accepted by strtoul */
>>> + if (strchr(s, '-'))
>>> + return -1;
>>
>> I think this is broken, in that it doesn't match strtoul's normal behaviour,
>> for strings like "1234-5678", no?
>
> The goal here is just to read a positive integer value. Rejecting
> "1234-5678" is indeed a good thing. We already rejected it before my
> patch by checking for p (AKA endptr for strtoul), as you noted below.
>
>> The test also doesn't work if the string has leading whitespace ("
>> -5").
>
> Why? It rejects any string that contain the character '-', regardless of
> trailing spaces.
Right, sorry.
>>> ul = strtoul(s, &p, base);
>>> if (errno || *p || p == s || (unsigned int) ul != ul)
>>> return -1;
>>
>> Hmm, but we check *p here, so IIUC it's an error if the string has any
>> trailing non-digits. Weird.
>
> strtoul_ui is more defensive than strtoul, by design.
Fair enough, just not what I expected from a function with that name.
M.
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