strtol

STRTOL(3)                   Linux Programmer's Manual                  STRTOL(3)



NAME
       strtol - convert a string to a long integer.

SYNOPSIS
       #include <stdlib.h>

       long int strtol(const char *nptr, char **endptr, int base);

DESCRIPTION
       The strtol() function converts the string in nptr to a long integer value
       according to the given base, which must be between 2 and 36 inclusive, or
       be the special value 0.

       The string must 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 int 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 not NULL, strtol() stores the address of the first invalid
       character in *endptr.  If there were no digits at all, strtol() stores
       the original value of nptr in *endptr.  (Thus, if *nptr is not `\0' but
       **endptr is `\0' on return, the entire string is valid.)

RETURN VALUE
       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.

CONFORMING TO
       SVID 3, BSD 4.3, ISO 9899

SEE ALSO
       atof(3), atoi(3), atol(3), strtod(3), strtoul(3)

BUGS
       Ignores the current locale.



GNU                               10 June 1995                         STRTOL(3)