.\" Copyright (c) 1990 The Regents of the University of California.
.\" This code is derived from software contributed to Berkeley by
.\" %sccs.include.redist.man%
.\" @(#)strtoul.3 5.1 (Berkeley) %G%
strtoul \- convert a string to an unsigned long integer
.B "unsigned long strtoul(char *nptr, char **endptr, int base);
value according to the given
which must be between 2 and 36 inclusive,
or be the special value 0.
The string may begin with an arbitrary amount of white space
followed by a single optional `+' or `-' sign.
the string may then include a `0x' prefix,
and the number will be read in base 16; otherwise, a zero
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
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 bases above 10, the letter `A' in either upper or lower case
represents 10, `B' represents 11, and so forth, with `Z' representing 35.)
stores the address of the first invalid character in
If there were no digits at all, however,
stores the original value of
is '\e0' on return, the entire string was valid.)
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;
The given string was out of range; the value converted has been clamped.
conforms to ANSI X3.159-1989 (``ANSI C'').
Ignores the current locale.