Comment by thomashabets2

Fair enough.

For strtoul and friends, maybe? 7.24.1 is pretty dense, but the key parts are "the expected form of the subject sequence is a sequence of letters and digits representing an integer with the radix specified by base, optionally preceded by a plus or minus sign […] If the correct value is outside the range of representable values […] ULONG_MAX […] is returned".

So the "expected form" allows a minus sign, but then it's clearly "outside the range of representable values" for strtoul to try parsing a negative value. So maybe it should return ULONG_MAX on those.

So arguably a minus sign present could already be treated as an error, and still be standard compliant. Unless I'm misreading.