Minimal use of .Ar and .Nm.

Add section number to .Xr reference.
Add DIAGNOSTICS section name.
Remove unused #includes.
Be consistant in the parsing of flags and add missing option in usage string.
Add rcsid.

usr.bin/cksum/cksum.1

@@ -52,12 +52,12 @@
 .Ar \&3
 .Xc
 .Oc
-.Op Ar file ...
+.Op Ar
 .Nm sum
-.Op Ar file ...
+.Op Ar
 .Sh DESCRIPTION
 The
-.Nm cksum
+.Nm
 utility writes to the standard output three whitespace separated
 fields for each input file.
 These fields are a checksum
@@ -69,7 +69,7 @@ is written.
 The
 .Nm sum
 utility is identical to the
-.Nm cksum
+.Nm
 utility, except that it defaults to using historic algorithm 1, as
 described below.
 It is provided for compatibility only.
@@ -86,7 +86,7 @@ systems as the
 algorithm and by historic
 .At V
 systems as the
-.Xr sum
+.Xr sum 1
 algorithm when using the
 .Fl r
 option.
@@ -97,7 +97,7 @@ Algorithm 2 is the algorithm used by historic
 .At V
 systems as the
 default
-.Xr sum
+.Xr sum 1
 algorithm.
 This is a 32-bit checksum, and is defined as follows:
 .Bd -unfilled -offset indent
@@ -125,7 +125,7 @@ used is based on the polynomial used for
 .Tn CRC
 error checking
 in the networking standard
-.St -iso8802-3
+.St -iso8802-3 .
 The
 .Tn CRC
 checksum encoding is defined by the generating polynomial:
@@ -162,9 +162,9 @@ The coefficients of R(x) are considered to be a 32-bit sequence.
 .Pp
 The bit sequence is complemented and the result is the CRC.
 .Ed
-.Pp
+.Sh DIAGNOSTICS
 The
-.Nm cksum
+.Nm
 and
 .Nm sum
 utilities exit 0 on success, and >0 if an error occurs.
@@ -183,11 +183,11 @@ article.
 .Re
 .Sh STANDARDS
 The
-.Nm cksum
+.Nm
 utility is expected to conform to
 .St -p1003.2-92 .
 .Sh HISTORY
 The
-.Nm cksum
+.Nm
 utility appeared in
 .Bx 4.4 .

usr.bin/cksum/cksum.c

@@ -48,14 +48,11 @@ static const char rcsid[] =
   "$FreeBSD$";
 #endif /* not lint */
 
-#include <sys/cdefs.h>
 #include <sys/types.h>
 
 #include <err.h>
-#include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -95,7 +92,7 @@ main(argc, argv)
 				} else if (!strcmp(optarg, "2")) {
 					cfncn = csum2;
 					pfncn = psum2;
-				} else if (*optarg == '3') {
+				} else if (!strcmp(optarg, "3")) {
 					cfncn = crc32;
 					pfncn = pcrc;
 				} else {
@@ -136,7 +133,7 @@ main(argc, argv)
 static void
 usage()
 {
-	(void)fprintf(stderr, "usage: cksum [-o 1 | 2] [file ...]\n");
+	(void)fprintf(stderr, "usage: cksum [-o 1 | 2 | 3] [file ...]\n");
 	(void)fprintf(stderr, "       sum [file ...]\n");
 	exit(1);
 }

usr.bin/cksum/crc.c

@@ -35,7 +35,11 @@
  */
 
 #ifndef lint
-static const char sccsid[] = "@(#)crc.c	8.1 (Berkeley) 6/17/93";
+#if 0
+static char sccsid[] = "@(#)crc.c	8.1 (Berkeley) 6/17/93";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
 #endif /* not lint */
 
 #include <sys/types.h>

usr.bin/cksum/crc32.c

@@ -11,6 +11,11 @@
  *			Spencer Garrett <srg@quick.com>
  */
 
+#ifndef lint
+static const char rcsid[] =
+  "$FreeBSD$";
+#endif /* not lint */
+
 #include <sys/types.h>
 
 #define CRC(crc, ch)	 (crc = (crc >> 8) ^ crctab[(crc ^ (ch)) & 0xff])

usr.bin/cksum/print.c

@@ -32,7 +32,11 @@
  */
 
 #ifndef lint
-static const char sccsid[] = "@(#)print.c	8.1 (Berkeley) 6/6/93";
+#if 0
+static char sccsid[] = "@(#)print.c	8.1 (Berkeley) 6/6/93";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
 #endif /* not lint */
 
 #include <sys/types.h>

usr.bin/cksum/sum1.c

@@ -32,7 +32,11 @@
  */
 
 #ifndef lint
-static const char sccsid[] = "@(#)sum1.c	8.1 (Berkeley) 6/6/93";
+#if 0
+static char sccsid[] = "@(#)sum1.c	8.1 (Berkeley) 6/6/93";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
 #endif /* not lint */
 
 #include <sys/types.h>

usr.bin/cksum/sum2.c

@@ -32,7 +32,11 @@
  */
 
 #ifndef lint
-static const char sccsid[] = "@(#)sum2.c	8.1 (Berkeley) 6/6/93";
+#if 0
+static char sccsid[] = "@(#)sum2.c	8.1 (Berkeley) 6/6/93";
+#endif
+static const char rcsid[] =
+  "$FreeBSD$";
 #endif /* not lint */
 
 #include <sys/types.h>