STRTOL(3) BSD Library Functions Manual STRTOL(3)NAME
strtol, strtoq — convert string value to a long or quad_t integer
strtol(char *nptr, char **endptr, int base);
strtoq(char *nptr, char **endptr, int base);
The strtol() function converts the string in nptr to a long value. The
strtoq() function converts the string in nptr to a quad_t 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 deter‐
mined 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
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’ represent‐
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
‘\0’ but **endptr is ‘\0’ on return, the entire string was valid.)
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.
[ERANGE] The given string was out of range; the value converted has been
SEE ALSOatof(3), atoi(3), atol(3), strtod(3), strtoul(3)STANDARDS
The strtol() function conforms to ANSI X3.159-1989 (“ANSI C89”).
Ignores the current locale.
BSD June 4, 1993 BSD