STRTOL

NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO BUGS

strtol - convert a string to a long integer.

**#include
***nptr***, char *****endptr***, int** *base***);
**

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* (and returns
0). In particular, if **nptr* is not `0' but
***endptr* is `0' on return, the entire string is
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 clamped.

SVID 3, BSD 4.3, ISO 9899

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

Ignores the current locale.

16 pages link to strtol(3):

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