strtoul
Hurricane Electric Internet Services
NAME
strtoul - convert a string to an unsigned long integer.
SYNOPSIS
#include <stdlib.h>
unsigned long int strtol(const char *nptr, char **endptr,
intbase)
DESCRIPTION
The strtoul() function converts the string in nptr to an
unsigned long integer value according to the given base,
which must be between 2 and 36 inclusive, or be the spe-
cial value 0.
The string must begin with an arbitrary amount of white
space (as determined by isspace(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 int value in the obvious manner, stopping at the
first character which is not 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 not NULL, strtoul() stores the address of the
first invalid character in *endptr. If there were no dig-
its at all, strtoul() stores the original value of nptr in
*endptr. (Thus, if *nptr is not `\0' but **endptr is `\0'
on return, the entire string is invalid.)
RETURN VALUE
The strtoul() function 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 orig-
inal (non-negated) value would overflow; in the latter
case, strtoul() returns ULONG_MAX and sets the global
variable errno to ERANGE.
ERRORS
ERANGE The given string was out of range; the value con-
verted has been clamped.
CONFORMING TO
SVID 3, BSD 4.3, ISO 9899
SEE ALSO
atof(3), atoi(3), atol(3), strtod(3), strtol(3)
BUGS
Ignores the current locale.
Hurricane Electric Internet Services
Copyright (C) 1998
Hurricane Electric.
All Rights Reserved.