STRTOUL(3)STRTOUL(3)NAMEstrtoul - convert a string to an unsigned long integer
SYNOPSIS
#include <stdlib.h>
#include <limits.h>
unsigned long strtoul(char *nptr, char **endptr, int base);
DESCRIPTION
Strtoul converts the string in nptr to an unsigned long value according
to the given base, 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 (as deter‐
mined by isspace; see ctype(3)), followed by a single optional `+' or
`-' sign. If base is zero or 16, the string may then include a `0x'
prefix, and the number will be read in base 16; otherwise, a zero 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.)
If endptr is non nil, strtoul stores the address of the first invalid
character in *endptr. If there were no digits at all, however, strtoul
stores the original value of nptr in *endptr. (Thus, if *nptr is not
'\0' but **endptr is '\0' on return, the entire string was valid.)
RETURN VALUE
Strtoul 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 latter
case, strtoul returns ULONG_MAX and sets errno to ERANGE.
ERRORS
[ERANGE]
The given string was out of range; the value converted has been
clamped.
SEE ALSOstrtol(3)STANDARDS
Strtoul conforms to ANSI X3.159-1989 (``ANSI C'').
BUGS
Ignores the current locale.
4.4 Berkeley Distribution May 15, 1990 STRTOUL(3)
