Re: scripts/basic/fixdep: Complete error handling in print_cmdline()

[Michal Marek]

Dne 2.11.2016 v 19:30 Masahiro Yamada napsal(a):
> 2016-11-03 2:38 GMT+09:00 SF Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>:
>>>>> +       if (printf("cmd_%s := %s\n\n", target, cmdline) < 10) {
>>>>
>>>> Rather than scatter fragile magic numbers, like 10, throughout the
>>>> code, if you're hell-bent on checking for printf errors you could
>>>> write a little wrapper function that hid the magic number and bundled
>>>> up the errno stuff.
>>>
>>>
>>> BTW, how the magic number "10" was calculated?
>>
>> Does the passed format string indicate how many characters should be
>> printed at least?
> 
> So, the check is a bit compromised.
> The printf() should print at lease 10 characters.
> If "target" or "cmdline" is not NULL, it should print more.

printf() / fprintf() return a negative value if an error such as ENOSPC
occurs. So just check for < 0 and preferably use a wrapper.

Michal