1 files changed, 113 insertions, 35 deletions

diff --git a/src/lib/libc/stdlib/strtol.3 b/src/lib/libc/stdlib/strtol.3
index 808ba90165..3f5375c5e3 100644
--- a/src/lib/libc/stdlib/strtol.3
+++ b/src/lib/libc/stdlib/strtol.3
@@ -13,11 +13,7 @@
 .\" 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
+.\" 3. 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.
 .\"
@@ -33,49 +29,57 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"     from: @(#)strtol.3      5.4 (Berkeley) 6/25/92
-.\"     $Id: strtol.3,v 1.1.1.1 1995/10/18 08:42:19 deraadt Exp $
+.\"     $OpenBSD: strtol.3,v 1.13 2003/06/02 20:18:38 millert Exp $
 .\"
 .Dd June 25, 1992
 .Dt STRTOL 3
 .Os
 .Sh NAME
-.Nm strtol, strtoq
-.Nd convert string value to a long or quad_t integer
+.Nm strtol ,
+.Nm strtoll ,
+.Nm strtoq
+.Nd "convert string value to a long or long long integer"
 .Sh SYNOPSIS
 .Fd #include <stdlib.h>
 .Fd #include <limits.h>
 .Ft long
-.Fn strtol "char *nptr" "char **endptr" "int base"
-
+.Fn strtol "const char *nptr" "char **endptr" "int base"
+.Pp
+.Fd #include <stdlib.h>
+.Fd #include <limits.h>
+.Ft long long
+.Fn strtoll "const char *nptr" "char **endptr" "int base"
+.Pp
 .Fd #include <sys/types.h>
 .Fd #include <stdlib.h>
 .Fd #include <limits.h>
 .Ft quad_t
-.Fn strtoq "char *nptr" "char **endptr" "int base"
+.Fn strtoq "const char *nptr" "char **endptr" "int base"
 .Sh DESCRIPTION
 The
 .Fn strtol
-function
-converts the string in
+function converts the string in
 .Fa nptr
 to a
-.Em long
+.Li long
 value.
 The
-.Fn strtoq
-function
-converts the string in
+.Fn strtoll
+function converts the string in
 .Fa nptr
 to a
-.Em quad_t
+.Li long long
 value.
+The
+.Fn strtoq
+function is a deprecated equivalent of
+.Fn strtoll
+and is provided for backwards compatibility with legacy programs.
 The conversion is done according to the given
 .Fa base ,
-which must be between 2 and 36 inclusive,
-or be the special value 0.
+which must be a number between 2 and 36 inclusive or the special value 0.
 .Pp
-The string may begin with an arbitrary amount of white space
+The string may begin with an arbitrary amount of whitespace
 (as determined by
 .Xr isspace 3 )
 followed by a single optional
@@ -85,25 +89,22 @@ or
 sign.
 If
 .Fa base
-is zero or 16,
-the string may then include a
+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
+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
+.Li 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,
+in either upper or lower case represents 10,
 .Ql B
 represents 11, and so forth, with
 .Ql Z
@@ -111,7 +112,7 @@ representing 35.)
 .Pp
 If
 .Fa endptr
-is non nil,
+is non-null,
 .Fn strtol
 stores the address of the first invalid character in
 .Fa *endptr .
@@ -133,8 +134,7 @@ on return, the entire string was valid.)
 .Sh RETURN VALUES
 The
 .Fn strtol
-function
-returns the result of the conversion,
+function returns the result of the conversion,
 unless the value would underflow or overflow.
 If an underflow occurs,
 .Fn strtol
@@ -148,6 +148,76 @@ In both cases,
 .Va errno
 is set to
 .Er ERANGE .
+.Pp
+The
+.Fn strtoll
+function has identical return values except that
+.Dv LLONG_MIN
+and
+.Dv LLONG_MAX
+are used to indicate underflow and overflow respectively.
+.Sh EXAMPLES
+Ensuring that a string is a valid number (i.e., in range and containing no
+trailing characters) requires clearing
+.Va errno
+beforehand explicitly since
+.Va errno
+is not changed on a successful call to
+.Fn strtol ,
+and the return value of
+.Fn strtol
+cannot be used unambiguously to signal an error:
+.Bd -literal -offset indent
+char *ep;
+long lval;
+
+\&...
+
+errno = 0;
+lval = strtol(buf, &ep, 10);
+if (buf[0] == '\e0' || *ep != '\e0')
+        goto not_a_number;
+if (errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN))
+        goto out_of_range;
+.Ed
+.Pp
+This example will accept
+.Dq 12
+but not
+.Dq 12foo
+or
+.Dq 12\en .
+If trailing whitespace is acceptable, further checks must be done on
+.Va *ep ;
+alternately, use
+.Xr sscanf 3 .
+.Pp
+If
+.Fn strtol
+is being used instead of
+.Xr atoi 3 ,
+error checking is further complicated because the desired return value is an
+.Li int
+rather than a
+.Li long ;
+however, on some architectures integers and long integers are the same size.
+Thus the following is necessary:
+.Bd -literal -offset indent
+char *ep;
+int ival;
+long lval;
+
+\&...
+
+errno = 0;
+lval = strtol(buf, &ep, 10);
+if (buf[0] == '\e0' || *ep != '\e0')
+     goto not_a_number;
+if ((errno == ERANGE && (lval == LONG_MAX || lval == LONG_MIN)) ||
+    (lval > INT_MAX || lval < INT_MIN))
+     goto out_of_range;
+ival = lval;
+.Ed
 .Sh ERRORS
 .Bl -tag -width Er
 .It Bq Er ERANGE
@@ -157,13 +227,21 @@ The given string was out of range; the value converted has been clamped.
 .Xr atof 3 ,
 .Xr atoi 3 ,
 .Xr atol 3 ,
+.Xr atoll 3 ,
+.Xr sscanf 3 ,
 .Xr strtod 3 ,
 .Xr strtoul 3
 .Sh STANDARDS
 The
 .Fn strtol
-function
-conforms to
-.St -ansiC .
+and
+.Fn strtoll
+functions conform to
+.St -ansiC-99 .
+The
+.Fn strtoq
+function is a
+.Bx
+extension and is provided for backwards compatibility with legacy programs.
 .Sh BUGS
 Ignores the current locale.