NAME
strtol, strtoq —
convert string value to a long or
quad_t integer
SYNOPSIS
#include
<stdlib.h>
#include <limits.h>
long
strtol(char
*nptr, char
**endptr, int
base);
#include <sys/types.h>
#include <stdlib.h>
#include <limits.h>
quad_t
strtoq(char
*nptr, char
**endptr, int
base);
DESCRIPTION
Thestrtol()
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
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
‘\0’ but
**endptr is ‘\0’
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
STANDARDS
The strtol() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
BUGS
Ignores the current locale.