@node strtoul
@subsection @code{strtoul}
@findex strtoul

POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/strtoul.html}

Gnulib module: strtoul
@mindex strtoul

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some old platforms.
@item
This function does not parse the leading @samp{0} when the input string is
@code{"0x"} and the base is 16 or 0 on some platforms:
Minix 3.3, mingw, MSVC 14.
@item
This function does not parse binary integers (with a @samp{0b} or @samp{0B}
prefix) when the base is 2 or 0 on many platforms.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
If no conversion could be performed, this function sets @code{errno}
to @code{EINVAL} on some platforms.  Portable programs should check
for no conversion by comparing @code{str} to @code{*endptr}, not by
inspecting @code{errno}.
@end itemize
