kstrtouint(9) [centos man page]

KSTRTOUINT(9)						     Basic C Library Functions						     KSTRTOUINT(9)

NAME

       kstrtouint - convert a string to an unsigned int

SYNOPSIS

       int kstrtouint(const char * s, unsigned int base, unsigned int * res);

ARGUMENTS

       s
	   The start of the string. The string must be null-terminated, and may also include a single newline before its terminating null. The
	   first character may also be a plus sign, but not a minus sign.

       base
	   The number base to use. The maximum supported base is 16. If base is given as 0, then the base of the string is automatically detected
	   with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise
	   begins with 0, it will be parsed as an octal number. Otherwise it will be parsed as a decimal.

       res
	   Where to write the result of the conversion on success.

DESCRIPTION

       Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. Used as a replacement for the obsolete simple_strtoull. Return code
       must be checked.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							     KSTRTOUINT(9)

STRTOUL(3)						     Library Functions Manual							STRTOUL(3)

NAME

       strtoul - convert a string to an unsigned long

SYNOPSIS

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

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

DESCRIPTION

       The  strtoul()  function  converts the string in nptr to an unsigned long value.  The conversion 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 (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 repre-
       sents 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 `' but **endptr is `' 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 C X3.159-1989 (``ANSI C'').

BUGS

       Ignores the current locale.

4.4 Berkeley Distribution					 January 12, 1996							STRTOUL(3)