"Morten Welinder" <mwelinder@xxxxxxxxx> wrote:
>> There are about 20 uses of atoi, and most calls can return
>> a usable result in spite of an invalid input -- just because
>> atoi returns the same thing for "99" as "99-and-any-suffix".
>> It would be better not to ignore invalid inputs.
>
> atoi has undefined behaviour for "99-and-any-suffix". You might
> get lucky and get back 99, but you might also get a random value
> or a core dump.
I've never heard of that.
POSIX says that atoi(str) is equivalent to:
(int) strtol(str, (char **)NULL, 10)
except that the handling of errors may differ.
If the value cannot be represented, the behavior is undefined.
Since strtol works fine with such a suffix, and since 99 can be
represented, I don't see why there would be any undefined behavior.
Do you know of an implementation for which `atoi ("99-and-any-suffix")'
does anything other than return 99?
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