strtouq
converts the string nptr
to a uquadt value. The conversion is done according to the given base, which
shall be between 2 and 36 inclusive,
or be the special value 0.
nptr may begin with an arbitrary amount of white
space (as determined by isspace
(3)), followed by a
single optional + or - sign character. If
base is 0 or 16,
the string may then include a 0x prefix, and the number will
be read in base 16; otherwise, a 0 base is taken as
10 (decimal), unless the next character is 0, in which
case it is taken as 8 (octal).
The remainder of the string is converted to an unsigned long value in the obvious manner, stopping at the end of the string or at the first character that does not produce a valid digit in the given base. (In bases above 10, the letter A in either upper or lower case represents 10, B represents 11, and so forth, with Z representing 35.)
On success, strtouq
returns either the result of
the conversion or, if there was a leading minus sign, the negation of
the result of the conversion, unless the original (non-negated) value
would overflow. In the case of an overflow the function returns
UQUAD_MAX and the global variable errno
is set to ERANGE.