# strtoul(3) [bsd man page]

STRTOUL(3) Library Functions Manual STRTOUL(3)NAME

strtoul - convert a string to an unsigned longSYNOPSIS

#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 DistributionJanuary 12, 1996 STRTOUL(3)

## Check Out this Related Man Page

STRTOL(3) Library Functions Manual STRTOL(3)NAME

strtol - convert string value to a longSYNOPSIS

#include <stdlib.h> #include <limits.h> long strtol(nptr, endptr, base) char *nptr; char **endptr; int base;DESCRIPTION

The strtol() function converts the string in nptr to a 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 a long 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 non nil, strtol() stores the address of the first invalid character in *endptr . If there were no digits at all, however, strtol() 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 strtol() function returns the result of the conversion, unless the value would underflow or overflow. If an underflow occurs, strtol() returns LONG_MIN. If an overflow occurs, strtol() returns LONG_MAX. In both cases, errno is set to ERANGE .ERRORS

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

atof(3), atoi(3), atol(3), strtoul(3)STANDARDS

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

Ignores the current locale.4.4 Berkeley DistributionJanuary 12, 1996 STRTOL(3)