STRTOL
Section: C Library Functions (3)
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BSD mandoc
NAME
strtol, strtoq
- convert string value to a long or quad_t integer
SYNOPSIS
Fd #include <stdlib.h>
Fd #include <limits.h>
Ft long
Fn strtol char *nptr char **endptr int base
Fd #include <sys/types.h>
Fd #include <stdlib.h>
Fd #include <limits.h>
Ft quad_t
Fn strtoq char *nptr char **endptr int base
DESCRIPTION
The
Fn strtol
function
converts the string in
Fa nptr
to a
long
value.
The
Fn strtoq
function
converts the string in
Fa nptr
to a
quad_t
value.
The conversion is done according to the given
Fa 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
Fa 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
Fa 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
Fa endptr
is non nil,
Fn strtol
stores the address of the first invalid character in
Fa *endptr .
If there were no digits at all, however,
Fn strtol
stores the original value of
Fa nptr
in
Fa *endptr .
(Thus, if
Fa *nptr
is not
`\0'
but
Fa **endptr
is
`\0'
on return, the entire string was valid.)
RETURN VALUES
The
Fn strtol
function
returns the result of the conversion,
unless the value would underflow or overflow.
If an underflow occurs,
Fn strtol
returns
LONG_MIN
If an overflow occurs,
Fn strtol
returns
LONG_MAX
In both cases,
errno
is set to
Er ERANGE .
ERRORS
- Bq Er 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
Fn strtol
function
conforms to
St -ansiC .
BUGS
Ignores the current locale.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- ERRORS
-
- SEE ALSO
-
- STANDARDS
-
- BUGS
-
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Time: 21:44:08 GMT, August 05, 2022