strtoul - convert a string to an unsigned long integer.
SYNOPSIS
#include <stdlib.h>
unsigned long int strtoul(const char *nptr, char **endptr,
int base)
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 valid.)
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)
Ignores the current locale.
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