172 lines
4.3 KiB
Groff
172 lines
4.3 KiB
Groff
.\" Copyright (c) 1990, 1991, 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" This code is derived from software contributed to Berkeley by
|
|
.\" Chris Torek and the American National Standards Committee X3,
|
|
.\" on Information Processing Systems.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)strtol.3 8.1 (Berkeley) 6/4/93
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd June 4, 1993
|
|
.Dt STRTOL 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm strtol, strtoq
|
|
.Nd convert string value to a long or quad_t integer
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.Fd #include <stdlib.h>
|
|
.Fd #include <limits.h>
|
|
.Ft long
|
|
.Fn strtol "const char *nptr" "char **endptr" "int base"
|
|
|
|
.Fd #include <sys/types.h>
|
|
.Fd #include <stdlib.h>
|
|
.Fd #include <limits.h>
|
|
.Ft quad_t
|
|
.Fn strtoq "const char *nptr" "char **endptr" "int base"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn strtol
|
|
function
|
|
converts the string in
|
|
.Fa nptr
|
|
to a
|
|
.Em long
|
|
value.
|
|
The
|
|
.Fn strtoq
|
|
function
|
|
converts the string in
|
|
.Fa nptr
|
|
to a
|
|
.Em 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.
|
|
.Pp
|
|
The string may begin with an arbitrary amount of white space
|
|
(as determined by
|
|
.Xr isspace 3 )
|
|
followed by a single optional
|
|
.Ql +
|
|
or
|
|
.Ql -
|
|
sign.
|
|
If
|
|
.Fa base
|
|
is zero or 16,
|
|
the string may then include a
|
|
.Ql 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
|
|
.Ql 0 ,
|
|
in which case it is taken as 8 (octal).
|
|
.Pp
|
|
The remainder of the string is converted to a
|
|
.Em 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
|
|
.Ql A
|
|
in either upper or lower case
|
|
represents 10,
|
|
.Ql B
|
|
represents 11, and so forth, with
|
|
.Ql Z
|
|
representing 35.)
|
|
.Pp
|
|
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
|
|
.Ql \e0
|
|
but
|
|
.Fa **endptr
|
|
is
|
|
.Ql \e0
|
|
on return, the entire string was valid.)
|
|
.Sh 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
|
|
.Dv LONG_MIN .
|
|
If an overflow occurs,
|
|
.Fn strtol
|
|
returns
|
|
.Dv LONG_MAX .
|
|
In both cases,
|
|
.Va errno
|
|
is set to
|
|
.Er ERANGE .
|
|
.Sh ERRORS
|
|
.Bl -tag -width Er
|
|
.It Bq Er ERANGE
|
|
The given string was out of range; the value converted has been clamped.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr atof 3 ,
|
|
.Xr atoi 3 ,
|
|
.Xr atol 3 ,
|
|
.Xr strtod 3 ,
|
|
.Xr strtoul 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn strtol
|
|
function
|
|
conforms to
|
|
.St -ansiC .
|
|
.Sh BUGS
|
|
Ignores the current locale.
|