STRTOUL(3)                386BSD Programmer's Manual                STRTOUL(3)

NAME
     strtoul - convert a string to an unsigned long integer

SYNOPSIS
     #include <stdlib.h>
     #include <limits.h>

     strtoul(const char *nptr, char **endptr, int base)

DESCRIPTION
     The strtoul() function 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
     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 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 VALUES
     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 original (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 converted has been
               clamped.

SEE ALSO
     strtol(3)

STANDARDS
     The strtoul() function conforms to ANSI C3.159-1989 (``ANSI C'').

BUGS
     Ignores the current locale.

BSD Experimental                 June 29, 1991                               1