On Thu, Jul 06, 2017 at 03:42:19PM +0200, Marc Espie wrote: > 7.20.1.4 (3) If the value of base is zero, the expected form of the subject > sequence is that of an integer constant *as described in 6.4.4.1*, optionally > preceded by a plus or minus sign but not including an integer suffix [...] > > 6.4.4.1 is a grammar > > > integer-constant: > [...] > hexadecimal-constant integer-suffix_opt
You have skipped with [...] the part that actually matches "0". So yes, the ISO C grammar does require strtol and friends to handle "0xx" and similar as just "0". Joerg
