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BSD 2.11 - man page for strtoul (bsd section 3)

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STRTOUL(3)									       STRTOUL(3)

       strtoul - convert a string to an unsigned long

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

       unsigned long
       strtoul(nptr, endptr, base)
       char *nptr;
       char **endptr;
       int base;

       The strtoul() function converts the string in nptr to an unsigned long value.  The conver-
       sion is done 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

       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.)

       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 .

       [ERANGE]       The given string was out of range; the value converted has been clamped.


       The strtoul() function conforms to ANSI C X3.159-1989 (``ANSI C'').

       Ignores the current locale.

4.4 Berkeley Distribution		 January 12, 1996			       STRTOUL(3)
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