STRTOL(3) MachTen Programmer’s Manual STRTOL(3)

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
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
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’ represent-
ing 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() re-
turns 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), strtod(3), strtoul(3)

STANDARDS
The strtol() function conforms to ANSI C3.159-1989 (‘‘ANSI C’’).

BUGS
Ignores the current locale.

4.4BSD June 4, 1993 1