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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)

Check Out this Related Man Page

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)

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