ANSIify function definitions.

Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by:	md5

74 files changed, 421 insertions, 747 deletions

diff --git a/usr.bin/basename/basename.c b/usr.bin/basename/basename.c
index 20c056270627..9e1a992cf641 100644
--- a/usr.bin/basename/basename.c
+++ b/usr.bin/basename/basename.c
@@ -56,9 +56,7 @@ __FBSDID("$FreeBSD$");
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	char *p, *q, *suffix;
 	size_t suffixlen;
@@ -111,7 +109,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 
 	(void)fprintf(stderr,
diff --git a/usr.bin/chflags/chflags.c b/usr.bin/chflags/chflags.c
index b2e6c2368264..92046338ac7c 100644
--- a/usr.bin/chflags/chflags.c
+++ b/usr.bin/chflags/chflags.c
@@ -60,9 +60,7 @@ __FBSDID("$FreeBSD$");
 void	usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	FTS *ftsp;
 	FTSENT *p;
@@ -177,7 +175,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 	    "usage: chflags [-R [-H | -L | -P]] flags file ...\n");
diff --git a/usr.bin/col/col.c b/usr.bin/col/col.c
index 73d4e0fdce1c..b45dd67d2fad 100644
--- a/usr.bin/col/col.c
+++ b/usr.bin/col/col.c
@@ -118,9 +118,7 @@ int	pass_unknown_seqs;	/* pass unknown control sequences */
 	} while (0)
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int ch;
 	CHAR *c;
@@ -330,8 +328,7 @@ main(argc, argv)
 }
 
 void
-flush_lines(nflush)
-	int nflush;
+flush_lines(int nflush)
 {
 	LINE *l;
 
@@ -357,7 +354,7 @@ flush_lines(nflush)
  * feeds.
  */
 void
-flush_blanks()
+flush_blanks(void)
 {
 	int half, i, nb;
 
@@ -386,8 +383,7 @@ flush_blanks()
  * and character set shifts.
  */
 void
-flush_line(l)
-	LINE *l;
+flush_line(LINE *l)
 {
 	CHAR *c, *endc;
 	int nchars, last_col, this_col;
@@ -494,7 +490,7 @@ flush_line(l)
 static LINE *line_freelist;
 
 LINE *
-alloc_line()
+alloc_line(void)
 {
 	LINE *l;
 	int i;
@@ -515,8 +511,7 @@ alloc_line()
 }
 
 void
-free_line(l)
-	LINE *l;
+free_line(LINE *l)
 {
 
 	l->l_next = line_freelist;
@@ -524,7 +519,7 @@ free_line(l)
 }
 
 void
-usage()
+usage(void)
 {
 
 	(void)fprintf(stderr, "usage: col [-bfhpx] [-l nline]\n");
@@ -532,8 +527,7 @@ usage()
 }
 
 void
-dowarn(line)
-	int line;
+dowarn(int line)
 {
 
 	warnx("warning: can't back up %s",
diff --git a/usr.bin/colcrt/colcrt.c b/usr.bin/colcrt/colcrt.c
index 6cd9be6ef3f5..5d7fd15afc91 100644
--- a/usr.bin/colcrt/colcrt.c
+++ b/usr.bin/colcrt/colcrt.c
@@ -81,9 +81,7 @@ static int	plus(char, char);
 static void	usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int c;
 	char *cp, *dp;
@@ -191,15 +189,14 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 	exit(1);
 }
 
 static int
-plus(c, d)
-	char c, d;
+plus(char c, char d)
 {
 
 	return ((c == '|' && d == '-') || d == '_');
@@ -208,11 +205,10 @@ plus(c, d)
 int first;
 
 static void
-pflush(ol)
-	int ol;
+pflush(int ol)
 {
-	register int i;
-	register char *cp;
+	int i;
+	char *cp;
 	char lastomit;
 	int l;
 
@@ -243,10 +239,9 @@ pflush(ol)
 }
 
 static void
-move(l, m)
-	int l, m;
+move(int l, int m)
 {
-	register char *cp, *dp;
+	char *cp, *dp;
 
 	for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 		switch (*cp) {
diff --git a/usr.bin/cut/cut.c b/usr.bin/cut/cut.c
index 6824a565d667..b8bf0b3b35dd 100644
--- a/usr.bin/cut/cut.c
+++ b/usr.bin/cut/cut.c
@@ -68,9 +68,7 @@ void	needpos(size_t);
 static 	void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	FILE *fp;
 	void (*fcn)(FILE *, const char *);
@@ -155,8 +153,7 @@ size_t autostart, autostop, maxval;
 char *positions;
 
 void
-get_list(list)
-	char *list;
+get_list(char *list)
 {
 	size_t setautostart, start, stop;
 	char *pos;
@@ -237,9 +234,7 @@ needpos(size_t n)
  * c_cut() ought to be much faster.
  */
 void
-b_n_cut(fp, fname)
-	FILE *fp;
-	const char *fname;
+b_n_cut(FILE *fp, const char *fname)
 {
 	size_t col, i, lbuflen;
 	char *lbuf;
@@ -297,9 +292,7 @@ b_n_cut(fp, fname)
 }
 
 void
-c_cut(fp, fname)
-	FILE *fp;
-	const char *fname __unused;
+c_cut(FILE *fp, const char *fname __unused)
 {
 	int ch, col;
 	char *pos;
@@ -327,9 +320,7 @@ c_cut(fp, fname)
 }
 
 void
-f_cut(fp, fname)
-	FILE *fp;
-	const char *fname __unused;
+f_cut(FILE *fp, const char *fname __unused)
 {
 	int ch, field, isdelim;
 	char *pos, *p, sep;
@@ -394,7 +385,7 @@ f_cut(fp, fname)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "%s\n%s\n%s\n",
 		"usage: cut -b list [-n] [file ...]",
diff --git a/usr.bin/enigma/enigma.c b/usr.bin/enigma/enigma.c
index 655536cc50b7..1b0f077a9b01 100644
--- a/usr.bin/enigma/enigma.c
+++ b/usr.bin/enigma/enigma.c
@@ -36,8 +36,7 @@ void	shuffle(char *);
 void	setup(char *);
 
 void
-setup(pw)
-	char *pw;
+setup(char *pw)
 {
 	int ic, i, k, temp, pf[2], pid;
 	unsigned rnd;
@@ -109,11 +108,9 @@ setup(pw)
 }
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
-	register int i, n1, n2, nr1, nr2;
+	int i, n1, n2, nr1, nr2;
 	int secureflg = 0, kflag = 0;
 	char *cp;
 
@@ -169,8 +166,7 @@ main(argc, argv)
 }
 
 void
-shuffle(deckary)
-	char deckary[];
+shuffle(char deckary[])
 {
 	int i, ic, k, temp;
 	unsigned rnd;
diff --git a/usr.bin/env/env.c b/usr.bin/env/env.c
index a9554577cb3f..26651f4d7487 100644
--- a/usr.bin/env/env.c
+++ b/usr.bin/env/env.c
@@ -58,9 +58,7 @@ extern char **environ;
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	char **ep, *p;
 	char *cleanenv[1];
@@ -89,7 +87,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 	    "usage: env [-i] [name=value ...] [utility [argument ...]]\n");
diff --git a/usr.bin/expand/expand.c b/usr.bin/expand/expand.c
index 70e1247bb444..927c3ab36c4c 100644
--- a/usr.bin/expand/expand.c
+++ b/usr.bin/expand/expand.c
@@ -62,12 +62,10 @@ static void getstops(char *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
-	register int c, column;
-	register int n;
+	int c, column;
+	int n;
 	int rval;
 
 	setlocale(LC_CTYPE, "");
@@ -159,10 +157,9 @@ main(argc, argv)
 }
 
 static void
-getstops(cp)
-	register char *cp;
+getstops(char *cp)
 {
-	register int i;
+	int i;
 
 	nstops = 0;
 	for (;;) {
@@ -185,7 +182,7 @@ getstops(cp)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf (stderr, "usage: expand [-t tablist] [file ...]\n");
 	exit(1);
diff --git a/usr.bin/finger/extern.h b/usr.bin/finger/extern.h
index 8054ff404b96..c8ff7f07b296 100644
--- a/usr.bin/finger/extern.h
+++ b/usr.bin/finger/extern.h
@@ -38,15 +38,21 @@ extern char tbuf[1024];			/* Temp buffer for anybody. */
 extern int entries;			/* Number of people. */
 extern DB *db;				/* Database. */
 extern int d_first;
+extern sa_family_t family;
 extern int gflag;
+extern int lflag;
+extern time_t now;
+extern int oflag;
+extern int pplan;			/* don't show .plan/.project */
+extern int Tflag;
 
 void	 enter_lastlog(PERSON *);
 PERSON	*enter_person(struct passwd *);
 void	 enter_where(struct utmp *, PERSON *);
-PERSON	*find_person(char *);
-int		hide(struct passwd *);
+PERSON	*find_person(const char *);
+int	 hide(struct passwd *);
 void	 lflag_print(void);
-int	 match(struct passwd *, char *);
+int	 match(struct passwd *, const char *);
 void	 netfinger(char *);
 PERSON	*palloc(void);
 char	*prphone(char *);
diff --git a/usr.bin/finger/finger.c b/usr.bin/finger/finger.c
index a695672bd1ac..8aafdd50c3b8 100644
--- a/usr.bin/finger/finger.c
+++ b/usr.bin/finger/finger.c
@@ -102,9 +102,7 @@ static void usage(void);
 static void userlist(int, char **);
 
 static int
-option(argc, argv)
-	int argc;
-	char **argv;
+option(int argc, char **argv)
 {
 	int ch;
 
@@ -151,16 +149,14 @@ option(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: finger [-46lmpshoT] [login ...]\n");
 	exit(1);
 }
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int envargc, argcnt;
 	char *envargv[3];
@@ -229,7 +225,7 @@ main(argc, argv)
 }
 
 static void
-loginlist()
+loginlist(void)
 {
 	PERSON *pn;
 	DBT data, key;
@@ -269,9 +265,7 @@ loginlist()
 }
 
 static void
-userlist(argc, argv)
-	int argc;
-	char **argv;
+userlist(int argc, char **argv)
 {
 	PERSON *pn;
 	DBT data, key;
diff --git a/usr.bin/finger/lprint.c b/usr.bin/finger/lprint.c
index 20b03060f3e2..16a10a57b9b3 100644
--- a/usr.bin/finger/lprint.c
+++ b/usr.bin/finger/lprint.c
@@ -44,6 +44,7 @@ static char sccsid[] = "@(#)lprint.c	8.3 (Berkeley) 4/28/95";
 __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <ctype.h>
@@ -69,9 +70,8 @@ static void	lprint(PERSON *);
 static void     vputc(unsigned char);
 
 void
-lflag_print()
+lflag_print(void)
 {
-	extern int pplan;
 	PERSON *pn;
 	int sflag, r;
 	PERSON *tmp;
@@ -101,10 +101,8 @@ lflag_print()
 }
 
 static void
-lprint(pn)
-	PERSON *pn;
+lprint(PERSON *pn)
 {
-	extern time_t now;
 	struct tm *delta;
 	WHERE *w;
 	int cpr, len, maxlen;
@@ -258,9 +256,7 @@ no_gecos:
 }
 
 static int
-demi_print(str, oddfield)
-	char *str;
-	int oddfield;
+demi_print(char *str, int oddfield)
 {
 	static int lenlast;
 	int lenthis, maxlen;
@@ -298,8 +294,7 @@ demi_print(str, oddfield)
 }
 
 int
-show_text(directory, file_name, header)
-	const char *directory, *file_name, *header;
+show_text(const char *directory, const char *file_name, const char *header)
 {
 	struct stat sb;
 	FILE *fp;
@@ -352,8 +347,7 @@ show_text(directory, file_name, header)
 }
 
 static void
-vputc(ch)
-	unsigned char ch;
+vputc(unsigned char ch)
 {
 	int meta;
 
diff --git a/usr.bin/finger/net.c b/usr.bin/finger/net.c
index b4df12434220..240cbcadd4fa 100644
--- a/usr.bin/finger/net.c
+++ b/usr.bin/finger/net.c
@@ -58,17 +58,12 @@ __FBSDID("$FreeBSD$");
 #include <utmp.h>
 #include "finger.h"
 
-extern int lflag;		/* XXX finger.h? */
-extern int Tflag;		/* XXX finger.h? */
-extern sa_family_t family;
-
 static void cleanup(int sig);;
 static int do_protocol(const char *name, const struct addrinfo *ai);
 static void trying(const struct addrinfo *ai);
 
 void
-netfinger(name)
-	char *name;
+netfinger(char *name)
 {
 	int error, multi;
 	char *host;
diff --git a/usr.bin/finger/sprint.c b/usr.bin/finger/sprint.c
index b209b5622b31..396c86e39dd5 100644
--- a/usr.bin/finger/sprint.c
+++ b/usr.bin/finger/sprint.c
@@ -43,6 +43,8 @@ static char sccsid[] = "@(#)sprint.c	8.3 (Berkeley) 4/28/95";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include <sys/types.h>
+#include <sys/socket.h>
 #include <db.h>
 #include <err.h>
 #include <langinfo.h>
@@ -56,10 +58,8 @@ __FBSDID("$FreeBSD$");
 static void	  stimeprint(WHERE *);
 
 void
-sflag_print()
+sflag_print(void)
 {
-	extern time_t now;
-	extern int    oflag;
 	PERSON *pn;
 	WHERE *w;
 	int sflag, r, namelen;
@@ -163,8 +163,7 @@ no_gecos:
 }
 
 static void
-stimeprint(w)
-	WHERE *w;
+stimeprint(WHERE *w)
 {
 	struct tm *delta;
 
diff --git a/usr.bin/finger/util.c b/usr.bin/finger/util.c
index ec8df2e90f27..229d58a9abce 100644
--- a/usr.bin/finger/util.c
+++ b/usr.bin/finger/util.c
@@ -44,6 +44,7 @@ static char sccsid[] = "@(#)util.c	8.3 (Berkeley) 4/28/95";
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <ctype.h>
 #include <db.h>
@@ -65,9 +66,7 @@ static void	 userinfo(PERSON *, struct passwd *);
 static WHERE	*walloc(PERSON *);
 
 int
-match(pw, user)
-	struct passwd *pw;
-	char *user;
+match(struct passwd *pw, const char *user)
 {
 	char *p, *t;
 	char name[1024];
@@ -107,8 +106,7 @@ match(pw, user)
 }
 
 void
-enter_lastlog(pn)
-	PERSON *pn;
+enter_lastlog(PERSON *pn)
 {
 	WHERE *w;
 	static int opened, fd;
@@ -157,9 +155,7 @@ enter_lastlog(pn)
 }
 
 void
-enter_where(ut, pn)
-	struct utmp *ut;
-	PERSON *pn;
+enter_where(struct utmp *ut, PERSON *pn)
 {
 	WHERE *w;
 
@@ -174,8 +170,7 @@ enter_where(ut, pn)
 }
 
 PERSON *
-enter_person(pw)
-	struct passwd *pw;
+enter_person(struct passwd *pw)
 {
 	DBT data, key;
 	PERSON *pn;
@@ -210,8 +205,7 @@ enter_person(pw)
 }
 
 PERSON *
-find_person(name)
-	char *name;
+find_person(const char *name)
 {
 	struct passwd *pw;
 
@@ -240,7 +234,7 @@ find_person(name)
 }
 
 PERSON *
-palloc()
+palloc(void)
 {
 	PERSON *p;
 
@@ -250,8 +244,7 @@ palloc()
 }
 
 static WHERE *
-walloc(pn)
-	PERSON *pn;
+walloc(PERSON *pn)
 {
 	WHERE *w;
 
@@ -268,8 +261,7 @@ walloc(pn)
 }
 
 char *
-prphone(num)
-	char *num;
+prphone(char *num)
 {
 	char *p;
 	int len;
@@ -318,10 +310,8 @@ prphone(num)
 }
 
 static void
-find_idle_and_ttywrite(w)
-	WHERE *w;
+find_idle_and_ttywrite(WHERE *w)
 {
-	extern time_t now;
 	struct stat sb;
 	time_t touched;
 
@@ -342,9 +332,7 @@ find_idle_and_ttywrite(w)
 }
 
 static void
-userinfo(pn, pw)
-	PERSON *pn;
-	struct passwd *pw;
+userinfo(PERSON *pn, struct passwd *pw)
 {
 	char *p, *t;
 	char *bp, name[1024];
@@ -410,8 +398,7 @@ userinfo(pn, pw)
  */
 
 int
-hide(pw)
-	struct passwd *pw;
+hide(struct passwd *pw)
 {
 	struct stat st;
 	char buf[MAXPATHLEN];
diff --git a/usr.bin/fold/fold.c b/usr.bin/fold/fold.c
index 49dbb0e81213..fc5cb16d20c5 100644
--- a/usr.bin/fold/fold.c
+++ b/usr.bin/fold/fold.c
@@ -68,11 +68,9 @@ int bflag;			/* Count bytes, not columns */
 int sflag;			/* Split on word boundaries */
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
-	register int ch;
+	int ch;
 	int rval, width;
 	char *p;
 
@@ -123,7 +121,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: fold [-bs] [-w width] [file ...]\n");
 	exit(1);
@@ -141,8 +139,7 @@ usage()
  * returns embedded in the input stream.
  */
 void
-fold(width)
-	register int width;
+fold(int width)
 {
 	static char *buf;
 	static int buf_max;
@@ -196,8 +193,7 @@ fold(width)
  * Update the current column position for a character.
  */
 static int
-newpos(col, ch)
-	int col, ch;
+newpos(int col, int ch)
 {
 
 	if (bflag)
diff --git a/usr.bin/from/from.c b/usr.bin/from/from.c
index d42e0bd787fa..84d0c52b23a3 100644
--- a/usr.bin/from/from.c
+++ b/usr.bin/from/from.c
@@ -55,7 +55,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 #include <unistd.h>
 
-int match(char *, char *);
+int match(const char *, const char *);
 static void usage(void);
 
 int
@@ -64,7 +64,8 @@ main(int argc, char **argv)
 	FILE *mbox;
 	struct passwd *pwd;
 	int ch, count, newline;
-	char *file, *sender, *p;
+	const char *file;
+	char *sender, *p;
 #if MAXPATHLEN > BUFSIZ
 	char buf[MAXPATHLEN];
 #else
@@ -146,9 +147,10 @@ usage(void)
 }
 
 int
-match(char *line, char *sender)
+match(const char *line, const char *sender)
 {
-	char ch, pch, first, *p, *t;
+	char ch, pch, first;
+	const char *p, *t;
 
 	for (first = *sender++;;) {
 		if (isspace(ch = *line))
diff --git a/usr.bin/gcore/aoutcore.c b/usr.bin/gcore/aoutcore.c
index e9c2e63c1b85..7c8ede6d9343 100644
--- a/usr.bin/gcore/aoutcore.c
+++ b/usr.bin/gcore/aoutcore.c
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/user.h>
 #include <sys/sysctl.h>
 
+#include <arpa/inet.h>
 #include <machine/elf.h>
 #include <machine/vmparam.h>
 
@@ -99,7 +100,8 @@ main(argc, argv)
 {
 	struct kinfo_proc *ki = NULL;
 	struct exec exec;
-	int ch, cnt, efd, fd, sflag, uid;
+	int ch, cnt, efd, fd, sflag;
+	uid_t uid;
 	char *binfile, *corefile;
 	char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
 	int is_aout;
diff --git a/usr.bin/gcore/elfcore.c b/usr.bin/gcore/elfcore.c
index ef98a693223d..e473d7ce5bd8 100644
--- a/usr.bin/gcore/elfcore.c
+++ b/usr.bin/gcore/elfcore.c
@@ -125,28 +125,29 @@ elf_coredump(int fd, pid_t pid)
 
 	php = (Elf_Phdr *)((char *)hdr + sizeof(Elf_Ehdr)) + 1;
 	for (i = 0;  i < seginfo.count;  i++) {
-		int nleft = php->p_filesz;
+		uintmax_t nleft = php->p_filesz;
 
 		lseek(memfd, (off_t)php->p_vaddr, SEEK_SET);
 		while (nleft > 0) {
 			char buf[8*1024];
-			int nwant;
-			int ngot;
+			size_t nwant;
+			ssize_t ngot;
 
-			nwant = nleft;
-			if (nwant > sizeof buf)
+			if (nleft > sizeof(buf))
 				nwant = sizeof buf;
+			else
+				nwant = nleft;
 			ngot = read(memfd, buf, nwant);
 			if (ngot == -1)
 				err(1, "read from %s", memname);
-			if (ngot < nwant)
+			if ((size_t)ngot < nwant)
 				errx(1, "short read from %s:"
 				    " wanted %d, got %d", memname,
 				    nwant, ngot);
 			ngot = write(fd, buf, nwant);
 			if (ngot == -1)
 				err(1, "write of segment %d failed", i);
-			if (ngot != nwant)
+			if ((size_t)ngot != nwant)
 				errx(1, "short write");
 			nleft -= nwant;
 		}
@@ -395,7 +396,7 @@ readhdrinfo(pid_t pid, prstatus_t *status, prfpregset_t *fpregset,
 		err(1, "cannot open %s", name);
 	if ((n = read(fd, &status->pr_reg, sizeof status->pr_reg)) == -1)
 		err(1, "read error from %s", name);
-	if (n < sizeof status->pr_reg)
+	if ((size_t)n < sizeof(status->pr_reg))
 		errx(1, "short read from %s: wanted %u, got %d", name,
 		    sizeof status->pr_reg, n);
 	close(fd);
@@ -406,7 +407,7 @@ readhdrinfo(pid_t pid, prstatus_t *status, prfpregset_t *fpregset,
 		err(1, "cannot open %s", name);
 	if ((n = read(fd, fpregset, sizeof *fpregset)) == -1)
 		err(1, "read error from %s", name);
-	if (n < sizeof *fpregset)
+	if ((size_t)n < sizeof(*fpregset))
 		errx(1, "short read from %s: wanted %u, got %d", name,
 		    sizeof *fpregset, n);
 	close(fd);
diff --git a/usr.bin/gcore/gcore.c b/usr.bin/gcore/gcore.c
index e9c2e63c1b85..7c8ede6d9343 100644
--- a/usr.bin/gcore/gcore.c
+++ b/usr.bin/gcore/gcore.c
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/user.h>
 #include <sys/sysctl.h>
 
+#include <arpa/inet.h>
 #include <machine/elf.h>
 #include <machine/vmparam.h>
 
@@ -99,7 +100,8 @@ main(argc, argv)
 {
 	struct kinfo_proc *ki = NULL;
 	struct exec exec;
-	int ch, cnt, efd, fd, sflag, uid;
+	int ch, cnt, efd, fd, sflag;
+	uid_t uid;
 	char *binfile, *corefile;
 	char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
 	int is_aout;
diff --git a/usr.bin/gcore/md-nop.c b/usr.bin/gcore/md-nop.c
index ee6a04111cd0..af7072c88a57 100644
--- a/usr.bin/gcore/md-nop.c
+++ b/usr.bin/gcore/md-nop.c
@@ -48,9 +48,9 @@ __FBSDID("$FreeBSD$");
 
 void
 md_core(kd, fd, ki)
-	kvm_t *kd;
-	int fd;
-	struct kinfo_proc *ki;
+	kvm_t *kd __unused;
+	int fd __unused;
+	struct kinfo_proc *ki __unused;
 {
 	/* Don't need to fix anything for this architecture. */
 	return;
diff --git a/usr.bin/getconf/confstr.gperf b/usr.bin/getconf/confstr.gperf
index 2abb55fae2bb..ad2f509a04f3 100644
--- a/usr.bin/getconf/confstr.gperf
+++ b/usr.bin/getconf/confstr.gperf
@@ -18,7 +18,7 @@
 static const struct map *in_word_set(const char *str, unsigned int len);
 
 %}
-struct map { char *name; int key; };
+struct map { const char *name; int key; };
 %%
 PATH, _CS_PATH
 POSIX_V6_ILP32_OFF32_CFLAGS, _CS_POSIX_V6_ILP32_OFF32_CFLAGS
diff --git a/usr.bin/getconf/sysconf.gperf b/usr.bin/getconf/sysconf.gperf
index 10e020473472..b917000d7818 100644
--- a/usr.bin/getconf/sysconf.gperf
+++ b/usr.bin/getconf/sysconf.gperf
@@ -120,7 +120,7 @@
 static const struct map *in_word_set(const char *str, unsigned int len);
 
 %}
-struct map { char *name; int key; };
+struct map { const char *name; int key; };
 %%
 AIO_LISTIO_MAX, _SC_AIO_LISTIO_MAX
 AIO_MAX, _SC_AIO_MAX
diff --git a/usr.bin/getopt/getopt.c b/usr.bin/getopt/getopt.c
index 269a5786cf77..33637604f26f 100644
--- a/usr.bin/getopt/getopt.c
+++ b/usr.bin/getopt/getopt.c
@@ -6,9 +6,7 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 
 int
-main(argc, argv)
-int argc;
-char *argv[];
+main(int argc, char *argv[])
 {
 	int c;
 	int status = 0;
diff --git a/usr.bin/hesinfo/hesinfo.c b/usr.bin/hesinfo/hesinfo.c
index 7bbaead2f8ed..fa81864a5d00 100644
--- a/usr.bin/hesinfo/hesinfo.c
+++ b/usr.bin/hesinfo/hesinfo.c
@@ -30,9 +30,7 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 
 int 
-main(argc, argv)
-	int	argc;
-	char  **argv;
+main(int argc, char **argv)
 {
 	char  **list, **p, *bindname, *name, *type;
 	int     lflag = 0, errflg = 0, bflag = 0, c;
diff --git a/usr.bin/hexdump/conv.c b/usr.bin/hexdump/conv.c
index eea03be7b309..581b66631626 100644
--- a/usr.bin/hexdump/conv.c
+++ b/usr.bin/hexdump/conv.c
@@ -44,9 +44,7 @@ __FBSDID("$FreeBSD$");
 #include "hexdump.h"
 
 void
-conv_c(pr, p)
-	PR *pr;
-	u_char *p;
+conv_c(PR *pr, u_char *p)
 {
 	char buf[10];
 	char const *str;
@@ -92,9 +90,7 @@ strpr:		*pr->cchar = 's';
 }
 
 void
-conv_u(pr, p)
-	PR *pr;
-	u_char *p;
+conv_u(PR *pr, u_char *p)
 {
 	static char const * list[] = {
 		"nul", "soh", "stx", "etx", "eot", "enq", "ack", "bel",
diff --git a/usr.bin/hexdump/display.c b/usr.bin/hexdump/display.c
index f2eb93b11f90..2ab34a49e7ba 100644
--- a/usr.bin/hexdump/display.c
+++ b/usr.bin/hexdump/display.c
@@ -58,14 +58,13 @@ static off_t eaddress;			/* end address */
 static __inline void print(PR *, u_char *);
 
 void
-display()
+display(void)
 {
-	extern FU *endfu;
-	register FS *fs;
-	register FU *fu;
-	register PR *pr;
-	register int cnt;
-	register u_char *bp;
+	FS *fs;
+	FU *fu;
+	PR *pr;
+	int cnt;
+	u_char *bp;
 	off_t saveaddress;
 	u_char savech, *savebp;
 
@@ -113,9 +112,7 @@ display()
 }
 
 static __inline void
-print(pr, bp)
-	PR *pr;
-	u_char *bp;
+print(PR *pr, u_char *bp)
 {
 	long double ldbl;
 	   double f8;
@@ -212,11 +209,10 @@ print(pr, bp)
 }
 
 void
-bpad(pr)
-	PR *pr;
+bpad(PR *pr)
 {
 	static char const *spec = " -0+#";
-	register char *p1, *p2;
+	char *p1, *p2;
 
 	/*
 	 * Remove all conversion flags; '-' is the only one valid
@@ -233,11 +229,11 @@ bpad(pr)
 static char **_argv;
 
 u_char *
-get()
+get(void)
 {
 	static int ateof = 1;
 	static u_char *curp, *savp;
-	register int n;
+	int n;
 	int need, nread;
 	int valid_save = 0;
 	u_char *tmpp;
@@ -308,10 +304,8 @@ get()
 }
 
 int
-next(argv)
-	char **argv;
+next(char **argv)
 {
-	extern int exitval;
 	static int done;
 	int statok;
 
@@ -344,11 +338,9 @@ next(argv)
 }
 
 void
-doskip(fname, statok)
-	const char *fname;
-	int statok;
+doskip(const char *fname, int statok)
 {
-	register int cnt;
+	int cnt;
 	struct stat sb;
 
 	if (statok) {
diff --git a/usr.bin/hexdump/hexdump.c b/usr.bin/hexdump/hexdump.c
index 660a2d9e2584..2ed7c4b9df49 100644
--- a/usr.bin/hexdump/hexdump.c
+++ b/usr.bin/hexdump/hexdump.c
@@ -58,11 +58,9 @@ int exitval;				/* final exit value */
 int length = -1;			/* max bytes to read */
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
-	register FS *tfs;
+	FS *tfs;
 	char *p;
 
 	(void)setlocale(LC_ALL, "");
diff --git a/usr.bin/hexdump/hexdump.h b/usr.bin/hexdump/hexdump.h
index 360fe5da35ba..cf3b79c11d14 100644
--- a/usr.bin/hexdump/hexdump.h
+++ b/usr.bin/hexdump/hexdump.h
@@ -72,7 +72,9 @@ typedef struct _fs {			/* format strings */
 } FS;
 
 extern FS *fshead;			/* head of format strings list */
+extern FU *endfu;			/* format at end-of-data */
 extern int blocksize;			/* data block size */
+extern int exitval;			/* final exit value */
 extern int odmode;			/* are we acting as od(1)? */
 extern int length;			/* amount of data to read */
 extern off_t skip;			/* amount of data to skip at start */
diff --git a/usr.bin/hexdump/hexsyntax.c b/usr.bin/hexdump/hexsyntax.c
index fad2fa8edd76..4d21611f6a3f 100644
--- a/usr.bin/hexdump/hexsyntax.c
+++ b/usr.bin/hexdump/hexsyntax.c
@@ -52,9 +52,7 @@ __FBSDID("$FreeBSD$");
 off_t skip;				/* bytes to skip */
 
 void
-newsyntax(argc, argvp)
-	int argc;
-	char ***argvp;
+newsyntax(int argc, char ***argvp)
 {
 	int ch;
 	char *p, **argv;
@@ -135,7 +133,7 @@ newsyntax(argc, argvp)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
 "usage: hexdump [-bcCdovx] [-e fmt] [-f fmt_file] [-n length]",
diff --git a/usr.bin/hexdump/odsyntax.c b/usr.bin/hexdump/odsyntax.c
index 0a37d01ef336..19684bffb635 100644
--- a/usr.bin/hexdump/odsyntax.c
+++ b/usr.bin/hexdump/odsyntax.c
@@ -64,9 +64,7 @@ static void odoffset(int, char ***);
 static void odusage(void);
 
 void
-oldsyntax(argc, argvp)
-	int argc;
-	char ***argvp;
+oldsyntax(int argc, char ***argvp)
 {
 	static char empty[] = "", padding[] = PADDING;
 	int ch;
@@ -193,9 +191,7 @@ odusage(void)
 }
 
 static void
-odoffset(argc, argvp)
-	int argc;
-	char ***argvp;
+odoffset(int argc, char ***argvp)
 {
 	unsigned char *p, *num, *end;
 	int base;
diff --git a/usr.bin/hexdump/parse.c b/usr.bin/hexdump/parse.c
index 25ef0329ded6..7b7f8e777aff 100644
--- a/usr.bin/hexdump/parse.c
+++ b/usr.bin/hexdump/parse.c
@@ -52,10 +52,9 @@ __FBSDID("$FreeBSD$");
 FU *endfu;					/* format at end-of-data */
 
 void
-addfile(name)
-	char *name;
+addfile(char *name)
 {
-	register unsigned char *p;
+	unsigned char *p;
 	FILE *fp;
 	int ch;
 	char buf[2048 + 1];
@@ -78,8 +77,7 @@ addfile(name)
 }
 
 void
-add(fmt)
-	const char *fmt;
+add(const char *fmt)
 {
 	unsigned const char *p, *savep;
 	static FS **nextfs;
@@ -154,12 +152,11 @@ add(fmt)
 static const char *spec = ".#-+ 0123456789";
 
 int
-size(fs)
-	FS *fs;
+size(FS *fs)
 {
-	register FU *fu;
-	register int bcnt, cursize;
-	register unsigned char *fmt;
+	FU *fu;
+	int bcnt, cursize;
+	unsigned char *fmt;
 	int prec;
 
 	/* figure out the data block size needed for each format unit */
@@ -208,12 +205,11 @@ size(fs)
 }
 
 void
-rewrite(fs)
-	FS *fs;
+rewrite(FS *fs)
 {
 	enum { NOTOKAY, USEBCNT, USEPREC } sokay;
-	register PR *pr, **nextpr;
-	register FU *fu;
+	PR *pr, **nextpr;
+	FU *fu;
 	unsigned char *p1, *p2, *fmtp;
 	char savech, cs[3];
 	int nconv, prec;
@@ -449,10 +445,9 @@ isint2:					switch(fu->bcnt) {
 }
 
 void
-escape(p1)
-	register char *p1;
+escape(char *p1)
 {
-	register char *p2;
+	char *p2;
 
 	/* alphabetic escape sequences have to be done in place */
 	for (p2 = p1;; ++p1, ++p2) {
@@ -492,28 +487,25 @@ escape(p1)
 }
 
 void
-badcnt(s)
-	char *s;
+badcnt(char *s)
 {
 	errx(1, "%s: bad byte count", s);
 }
 
 void
-badsfmt()
+badsfmt(void)
 {
 	errx(1, "%%s: requires a precision or a byte count");
 }
 
 void
-badfmt(fmt)
-	const char *fmt;
+badfmt(const char *fmt)
 {
 	errx(1, "\"%s\": bad format", fmt);
 }
 
 void
-badconv(ch)
-	char *ch;
+badconv(char *ch)
 {
 	errx(1, "%%%s: bad conversion character", ch);
 }
diff --git a/usr.bin/id/id.c b/usr.bin/id/id.c
index 5d43e9fcda2c..2d4eee7e6573 100644
--- a/usr.bin/id/id.c
+++ b/usr.bin/id/id.c
@@ -67,9 +67,7 @@ struct passwd *
 int isgroups, iswhoami;
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct group *gr;
 	struct passwd *pw;
@@ -177,8 +175,7 @@ main(argc, argv)
 }
 
 void
-pretty(pw)
-	struct passwd *pw;
+pretty(struct passwd *pw)
 {
 	struct group *gr;
 	u_int eid, rid;
@@ -218,7 +215,7 @@ pretty(pw)
 }
 
 void
-current()
+current(void)
 {
 	struct group *gr;
 	struct passwd *pw;
@@ -259,8 +256,7 @@ current()
 }
 
 void
-user(pw)
-	struct passwd *pw;
+user(struct passwd *pw)
 {
 	struct group *gr;
 	const char *fmt;
@@ -287,9 +283,7 @@ user(pw)
 }
 
 void
-group(pw, nflag)
-	struct passwd *pw;
-	int nflag;
+group(struct passwd *pw, int nflag)
 {
 	struct group *gr;
 	int cnt, id, lastid, ngroups;
@@ -324,8 +318,7 @@ group(pw, nflag)
 }
 
 struct passwd *
-who(u)
-	char *u;
+who(char *u)
 {
 	struct passwd *pw;
 	long id;
@@ -345,8 +338,7 @@ who(u)
 }
 
 void
-pline(pw)
-	struct passwd *pw;
+pline(struct passwd *pw)
 {
 	u_int rid;
 
@@ -363,7 +355,7 @@ pline(pw)
 
 
 void
-usage()
+usage(void)
 {
 
 	if (isgroups)
diff --git a/usr.bin/ipcrm/ipcrm.c b/usr.bin/ipcrm/ipcrm.c
index 7f0f89b8a1fa..8c039aefd01e 100644
--- a/usr.bin/ipcrm/ipcrm.c
+++ b/usr.bin/ipcrm/ipcrm.c
@@ -48,12 +48,6 @@ __FBSDID("$FreeBSD$");
 #define IPC_TO_STRING(x) (x == 'Q' ? "message queue" : \
 	(x == 'M' ? "shared memory segment" : "semaphore"))
 
-void usage(void);
-int msgrm(key_t, int);
-int shmrm(key_t, int);
-int semrm(key_t, int);
-void not_configured(int);
-
 int signaled;
 
 void usage(void);
@@ -62,7 +56,7 @@ int shmrm(key_t, int);
 int semrm(key_t, int);
 void not_configured(int);
 
-void usage()
+void usage(void)
 {
 	fprintf(stderr, "%s\n%s\n",
 		"usage: ipcrm [-q msqid] [-m shmid] [-s semid]",
@@ -70,9 +64,7 @@ void usage()
 	exit(1);
 }
 
-int msgrm(key, id)
-    key_t key;
-    int id;
+int msgrm(key_t key, int id)
 {
     if (key) {
 	id = msgget(key, 0);
@@ -82,9 +74,7 @@ int msgrm(key, id)
     return msgctl(id, IPC_RMID, NULL);
 }
 
-int shmrm(key, id)
-    key_t key;
-    int id;
+int shmrm(key_t key, int id)
 {
     if (key) {
 	id = shmget(key, 0, 0);
@@ -94,9 +84,7 @@ int shmrm(key, id)
     return shmctl(id, IPC_RMID, NULL);
 }
 
-int semrm(key, id)
-    key_t key;
-    int id;
+int semrm(key_t key, int id)
 {
     union semun arg;
 
@@ -113,10 +101,7 @@ void not_configured(int signo __unused)
     signaled++;
 }
 
-int main(argc, argv)
-    int argc;
-    char *argv[];
-
+int main(int argc, char *argv[])
 {
     int c, result, errflg, target_id;
     key_t target_key;
diff --git a/usr.bin/join/join.c b/usr.bin/join/join.c
index 8d936c70bca4..e360f86808bb 100644
--- a/usr.bin/join/join.c
+++ b/usr.bin/join/join.c
@@ -77,7 +77,7 @@ typedef struct {
 	FILE *fp;		/* file descriptor */
 	u_long joinf;		/* join field (-1, -2, -j) */
 	int unpair;		/* output unpairable lines (-a) */
-	int number;		/* 1 for file 1, 2 for file 2 */
+	u_long number;		/* 1 for file 1, 2 for file 2 */
 
 	LINE *set;		/* set of lines with same field */
 	int pushbool;		/* if pushback is set */
@@ -114,9 +114,7 @@ void slurp(INPUT *);
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	INPUT *F1, *F2;
 	int aflag, ch, cval, vflag;
@@ -270,8 +268,7 @@ main(argc, argv)
 }
 
 void
-slurp(F)
-	INPUT *F;
+slurp(INPUT *F)
 {
 	LINE *lp, *lastlp, tmp;
 	size_t len;
@@ -360,9 +357,7 @@ slurp(F)
 }
 
 int
-cmp(lp1, fieldno1, lp2, fieldno2)
-	LINE *lp1, *lp2;
-	u_long fieldno1, fieldno2;
+cmp(LINE *lp1, u_long fieldno1, LINE *lp2, u_long fieldno2)
 {
 	if (lp1->fieldcnt <= fieldno1)
 		return (lp2->fieldcnt <= fieldno2 ? 0 : 1);
@@ -372,10 +367,9 @@ cmp(lp1, fieldno1, lp2, fieldno2)
 }
 
 void
-joinlines(F1, F2)
-	INPUT *F1, *F2;
+joinlines(INPUT *F1, INPUT *F2)
 {
-	unsigned int cnt1, cnt2;
+	u_long cnt1, cnt2;
 
 	/*
 	 * Output the results of a join comparison.  The output may be from
@@ -393,11 +387,9 @@ joinlines(F1, F2)
 }
 
 void
-outoneline(F, lp)
-	INPUT *F;
-	LINE *lp;
+outoneline(INPUT *F, LINE *lp)
 {
-	unsigned int cnt;
+	u_long cnt;
 
 	/*
 	 * Output a single line from one of the files, according to the
@@ -423,11 +415,9 @@ outoneline(F, lp)
 }
 
 void
-outtwoline(F1, lp1, F2, lp2)
-	INPUT *F1, *F2;
-	LINE *lp1, *lp2;
+outtwoline(INPUT *F1, LINE *lp1, INPUT *F2, LINE *lp2)
 {
-	unsigned int cnt;
+	u_long cnt;
 
 	/* Output a pair of lines according to the join list (if any). */
 	if (olist)
@@ -461,10 +451,7 @@ outtwoline(F1, lp1, F2, lp2)
 }
 
 void
-outfield(lp, fieldno, out_empty)
-	LINE *lp;
-	u_long fieldno;
-	int out_empty;
+outfield(LINE *lp, u_long fieldno, int out_empty)
 {
 	if (needsep++)
 		(void)printf("%c", *tabchar);
@@ -487,8 +474,7 @@ outfield(lp, fieldno, out_empty)
  * fields.
  */
 void
-fieldarg(option)
-	char *option;
+fieldarg(char *option)
 {
 	u_long fieldno, filenum;
 	char *end, *token;
@@ -522,10 +508,9 @@ fieldarg(option)
 }
 
 void
-obsolete(argv)
-	char **argv;
+obsolete(char **argv)
 {
-	unsigned int len;
+	size_t len;
 	char **p, *ap, *t;
 
 	while ((ap = *++argv) != NULL) {
@@ -588,8 +573,8 @@ jbad:				errx(1, "illegal option -- %s", ap);
 			if (ap[2] != '\0')
 				break;
 			for (p = argv + 2; *p; ++p) {
-				if (p[0][0] == '0' || (p[0][0] != '1' &&
-				    p[0][0] != '2' || p[0][1] != '.'))
+				if (p[0][0] == '0' || ((p[0][0] != '1' &&
+				    p[0][0] != '2') || p[0][1] != '.'))
 					break;
 				len = strlen(*p);
 				if (len - 2 != strspn(*p + 2, "0123456789"))
@@ -608,7 +593,7 @@ jbad:				errx(1, "illegal option -- %s", ap);
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "%s %s\n%s\n",
 	    "usage: join [-a fileno | -v fileno ] [-e string] [-1 field]",
diff --git a/usr.bin/last/last.c b/usr.bin/last/last.c
index b3325ccf4128..221f6db63095 100644
--- a/usr.bin/last/last.c
+++ b/usr.bin/last/last.c
@@ -119,9 +119,7 @@ usage(void)
 }
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int ch;
 	char *p;
@@ -198,7 +196,7 @@ main(argc, argv)
  *	read through the wtmp file
  */
 void
-wtmp()
+wtmp(void)
 {
 	struct utmp	*bp;			/* current structure */
 	struct stat	stb;			/* stat of file for size */
@@ -237,8 +235,7 @@ wtmp()
  *	process a single wtmp entry
  */
 void
-doentry(bp)
-	struct utmp *bp;
+doentry(struct utmp *bp)
 {
 	struct ttytab	*tt, *ttx;		/* ttylist entry */
 
@@ -325,9 +322,7 @@ doentry(bp)
  * logout type (crash/shutdown) as appropriate.
  */
 void
-printentry(bp, tt)
-	struct utmp *bp;
-	struct ttytab *tt;
+printentry(struct utmp *bp, struct ttytab *tt)
 {
 	char ct[80];
 	struct tm *tm;
@@ -378,8 +373,7 @@ printentry(bp, tt)
  *	see if want this entry
  */
 int
-want(bp)
-	struct utmp *bp;
+want(struct utmp *bp)
 {
 	ARG *step;
 
@@ -412,9 +406,7 @@ want(bp)
  *	add an entry to a linked list of arguments
  */
 void
-addarg(type, arg)
-	int type;
-	char *arg;
+addarg(int type, char *arg)
 {
 	ARG *cur;
 
@@ -433,8 +425,7 @@ addarg(type, arg)
  *	off the domain suffix since that's what login(1) does.
  */
 void
-hostconv(arg)
-	char *arg;
+hostconv(char *arg)
 {
 	static int first = 1;
 	static char *hostdot, name[MAXHOSTNAMELEN];
@@ -457,8 +448,7 @@ hostconv(arg)
  *	convert tty to correct name.
  */
 char *
-ttyconv(arg)
-	char *arg;
+ttyconv(char *arg)
 {
 	char *mval;
 
@@ -490,8 +480,7 @@ ttyconv(arg)
  * 	Derived from atime_arg1() in usr.bin/touch/touch.c
  */
 time_t
-dateconv(arg)
-        char *arg;
+dateconv(char *arg)
 {
         time_t timet;
         struct tm *t;
@@ -562,8 +551,7 @@ terr:           errx(1,
  *	on interrupt, we inform the user how far we've gotten
  */
 void
-onintr(signo)
-	int signo;
+onintr(int signo)
 {
 	char ct[80];
 	struct tm *tm;
diff --git a/usr.bin/lastcomm/lastcomm.c b/usr.bin/lastcomm/lastcomm.c
index 5583b995b395..dc47eb1bfee6 100644
--- a/usr.bin/lastcomm/lastcomm.c
+++ b/usr.bin/lastcomm/lastcomm.c
@@ -77,9 +77,7 @@ static	 void usage(void);
 #define AC_HZ ((double)AHZ)
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	char *p;
 	struct acct ab;
@@ -222,8 +220,7 @@ main(argc, argv)
 }
 
 time_t
-expand(t)
-	u_int t;
+expand(u_int t)
 {
 	time_t nt;
 
@@ -237,8 +234,7 @@ expand(t)
 }
 
 char *
-flagbits(f)
-	int f;
+flagbits(int f)
 {
 	static char flags[20] = "-";
 	char *p;
@@ -256,9 +252,7 @@ flagbits(f)
 }
 
 int
-requested(argv, acp)
-	char *argv[];
-	struct acct *acp;
+requested(char *argv[], struct acct *acp)
 {
 	const char *p;
 
@@ -275,8 +269,7 @@ requested(argv, acp)
 }
 
 const char *
-getdev(dev)
-	dev_t dev;
+getdev(dev_t dev)
 {
 	static dev_t lastdev = (dev_t)-1;
 	static const char *lastname;
@@ -291,7 +284,7 @@ getdev(dev)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 "usage: lastcomm [-EScesu] [ -f file ] [command ...] [user ...] [tty ...]\n");
diff --git a/usr.bin/leave/leave.c b/usr.bin/leave/leave.c
index 6931582aed55..89c3f5285716 100644
--- a/usr.bin/leave/leave.c
+++ b/usr.bin/leave/leave.c
@@ -64,13 +64,11 @@ static void usage(void);
  * It nags you like a mother hen.
  */
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
-	register u_int secs;
-	register int hours, minutes;
-	register char c, *cp = NULL;
+	u_int secs;
+	int hours, minutes;
+	char c, *cp = NULL;
 	struct tm *t;
 	time_t now;
 	int plusnow, t_12_hour;
@@ -139,10 +137,9 @@ main(argc, argv)
 }
 
 void
-doalarm(secs)
-	u_int secs;
+doalarm(u_int secs)
 {
-	register int bother;
+	int bother;
 	time_t daytime;
 	char tb[80];
 	int pid;
@@ -192,7 +189,7 @@ doalarm(secs)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: leave [[+]hhmm]\n");
 	exit(1);
diff --git a/usr.bin/lock/lock.c b/usr.bin/lock/lock.c
index 17f73128fd64..aa6af6af95d9 100644
--- a/usr.bin/lock/lock.c
+++ b/usr.bin/lock/lock.c
@@ -88,9 +88,7 @@ int	vtyunlock;			/* Unlock flag and code. */
 
 /*ARGSUSED*/
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	struct passwd *pw;
 	struct timeval timval;
@@ -242,7 +240,7 @@ main(argc, argv)
 
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: lock [-npv] [-t timeout]\n");
 	exit(1);
diff --git a/usr.bin/logger/logger.c b/usr.bin/logger/logger.c
index 25692af13339..3832752528b7 100644
--- a/usr.bin/logger/logger.c
+++ b/usr.bin/logger/logger.c
@@ -85,9 +85,7 @@ int	send_to_all = 0;	/* send message to all IPv4/IPv6 addresses */
  *	log.
  */
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int ch, logflags, pri;
 	char *tag, *host, buf[1024];
@@ -142,7 +140,7 @@ main(argc, argv)
 
 	/* log input line if appropriate */
 	if (argc > 0) {
-		register char *p, *endp;
+		char *p, *endp;
 		size_t len;
 
 		for (p = buf, endp = buf + sizeof(buf) - 2; *argv;) {
@@ -240,8 +238,7 @@ logmessage(int pri, char *host, char *buf)
  *  Decode a symbolic name to a numeric value
  */
 int
-pencode(s)
-	register char *s;
+pencode(char *s)
 {
 	char *save;
 	int fac, lev;
@@ -265,11 +262,9 @@ pencode(s)
 }
 
 int
-decode(name, codetab)
-	char *name;
-	CODE *codetab;
+decode(char *name, CODE *codetab)
 {
-	register CODE *c;
+	CODE *c;
 
 	if (isdigit(*name))
 		return (atoi(name));
@@ -282,7 +277,7 @@ decode(name, codetab)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: %s\n",
 	    "logger [-46Ais] [-f file] [-h host] [-p pri] [-t tag] [message ...]"
diff --git a/usr.bin/logname/logname.c b/usr.bin/logname/logname.c
index ebbce4931836..05faf7612416 100644
--- a/usr.bin/logname/logname.c
+++ b/usr.bin/logname/logname.c
@@ -53,9 +53,7 @@ __FBSDID("$FreeBSD$");
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[] __unused;
+main(int argc, char *argv[] __unused)
 {
 	char *p;
 
@@ -68,7 +66,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: logname\n");
 	exit(1);
diff --git a/usr.bin/look/look.c b/usr.bin/look/look.c
index 402ec9f78d13..33a12955de1c 100644
--- a/usr.bin/look/look.c
+++ b/usr.bin/look/look.c
@@ -101,9 +101,7 @@ void     print_from(unsigned char *, unsigned char *, unsigned char *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat sb;
 	int ch, fd, termchar, match;
@@ -160,11 +158,10 @@ main(argc, argv)
 }
 
 int
-look(string, front, back)
-	unsigned char *string, *front, *back;
+look(unsigned char *string, unsigned char *front, unsigned char *back)
 {
-	register int ch;
-	register unsigned char *readp, *writep;
+	int ch;
+	unsigned char *readp, *writep;
 
 	/* Reformat string string to avoid doing it multiple times later. */
 	for (readp = writep = string; (ch = *readp++);) {
@@ -228,10 +225,9 @@ look(string, front, back)
 	while (p < back && *p++ != '\n');
 
 char *
-binary_search(string, front, back)
-	register unsigned char *string, *front, *back;
+binary_search(unsigned char *string, unsigned char *front, unsigned char *back)
 {
-	register unsigned char *p;
+	unsigned char *p;
 
 	p = front + (back - front) / 2;
 	SKIP_PAST_NEWLINE(p, back);
@@ -263,8 +259,7 @@ binary_search(string, front, back)
  *	o front is before or at the first line to be printed.
  */
 char *
-linear_search(string, front, back)
-	unsigned char *string, *front, *back;
+linear_search(unsigned char *string, unsigned char *front, unsigned char *back)
 {
 	while (front < back) {
 		switch (compare(string, front, back)) {
@@ -286,8 +281,7 @@ linear_search(string, front, back)
  * Print as many lines as match string, starting at front.
  */
 void
-print_from(string, front, back)
-	register unsigned char *string, *front, *back;
+print_from(unsigned char *string, unsigned char *front, unsigned char *back)
 {
 	for (; front < back && compare(string, front, back) == EQUAL; ++front) {
 		for (; front < back && *front != '\n'; ++front)
@@ -312,10 +306,9 @@ print_from(string, front, back)
  * "back" terminated).
  */
 int
-compare(s1, s2, back)
-	register unsigned char *s1, *s2, *back;
+compare(unsigned char *s1, unsigned char *s2, unsigned char *back)
 {
-	register int ch;
+	int ch;
 
 	for (; *s1 && s2 < back && *s2 != '\n'; ++s1, ++s2) {
 		ch = *s2;
@@ -335,7 +328,7 @@ compare(s1, s2, back)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: look [-df] [-t char] string [file ...]\n");
 	exit(2);
diff --git a/usr.bin/makewhatis/makewhatis.c b/usr.bin/makewhatis/makewhatis.c
index 0ac4fc1ec999..30f2da8d0ba7 100644
--- a/usr.bin/makewhatis/makewhatis.c
+++ b/usr.bin/makewhatis/makewhatis.c
@@ -98,7 +98,7 @@ static const char *whatis_name="whatis";/* -n option: the name */
 static char *common_output;		/* -o option: the single output file */
 static char *locale;			/* user's locale if -L is used */
 static char *lang_locale;		/* short form of locale */
-static char *machine;
+static const char *machine;
 
 static int exit_code;			/* exit code to use when finished */
 static SLIST_HEAD(, visited_dir) visited_dirs =
@@ -358,7 +358,7 @@ open_output(char *name)
 static int
 linesort(const void *a, const void *b)
 {
-	return strcmp((const char *)(*(const char **)a), (const char *)(*(const char **)b));
+	return strcmp((*(const char * const *)a), (*(const char * const *)b));
 }
 
 /*
@@ -810,8 +810,8 @@ process_page(struct page_info *page, char *section_dir)
 static int
 pagesort(const void *a, const void *b)
 {
-	struct page_info *p1 = *(struct page_info **) a;
-	struct page_info *p2 = *(struct page_info **) b;
+	const struct page_info *p1 = *(struct page_info * const *) a;
+	const struct page_info *p2 = *(struct page_info * const *) b;
 	if (p1->inode == p2->inode)
 		return strcmp(p1->name, p2->name);
 	return p1->inode - p2->inode;
@@ -964,8 +964,6 @@ int
 main(int argc, char **argv)
 {
 	int opt;
-	extern int optind;
-	extern char *optarg;
 	FILE *fp = NULL;
 
 	while ((opt = getopt(argc, argv, "ai:n:o:vL")) != -1) {
diff --git a/usr.bin/mesg/mesg.c b/usr.bin/mesg/mesg.c
index 6c4a1e280887..8b39ec7b3db9 100644
--- a/usr.bin/mesg/mesg.c
+++ b/usr.bin/mesg/mesg.c
@@ -62,9 +62,7 @@ __FBSDID("$FreeBSD$");
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat sb;
 	char *tty;
@@ -111,7 +109,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: mesg [y | n]\n");
 	exit(2);
diff --git a/usr.bin/mkfifo/mkfifo.c b/usr.bin/mkfifo/mkfifo.c
index e2aa1cd11591..85cd6e145ac9 100644
--- a/usr.bin/mkfifo/mkfifo.c
+++ b/usr.bin/mkfifo/mkfifo.c
@@ -63,9 +63,7 @@ static void usage(void);
 static int f_mode;
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	char *modestr;
 	void *modep;
@@ -109,7 +107,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: mkfifo [-m mode] fifo_name ...\n");
 	exit(1);
diff --git a/usr.bin/msgs/msgs.c b/usr.bin/msgs/msgs.c
index d1d3bd426f5f..044fccc51d88 100644
--- a/usr.bin/msgs/msgs.c
+++ b/usr.bin/msgs/msgs.c
@@ -162,8 +162,7 @@ void	prmesg(int);
 static void usage(void);
 
 int
-main(argc, argv)
-int argc; char *argv[];
+main(int argc, char *argv[])
 {
 	bool newrc, already;
 	int rcfirst = 0;		/* first message to print (from .rc) */
@@ -287,8 +286,8 @@ int argc; char *argv[];
 		lastmsg = 0;
 
 		for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)){
-			register char *cp = dp->d_name;
-			register int i = 0;
+			char *cp = dp->d_name;
+			int i = 0;
 
 			if (dp->d_ino == 0)
 				continue;
@@ -622,15 +621,14 @@ cmnd:
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: msgs [fhlopq] [[-]number]\n");
 	exit(1);
 }
 
 void
-prmesg(length)
-int length;
+prmesg(int length)
 {
 	FILE *outf;
 	char *env_pager;
@@ -677,8 +675,7 @@ int length;
 }
 
 void
-onintr(unused)
-	int unused __unused;
+onintr(int unused __unused)
 {
 	signal(SIGINT, onintr);
 	if (mailing)
@@ -703,8 +700,7 @@ onintr(unused)
  * We have just gotten a susp.  Suspend and prepare to resume.
  */
 void
-onsusp(unused)
-	int unused __unused;
+onsusp(int unused __unused)
 {
 	signal(SIGTSTP, SIG_DFL);
 	sigsetmask(0);
@@ -715,8 +711,7 @@ onsusp(unused)
 }
 
 int
-linecnt(f)
-FILE *f;
+linecnt(FILE *f)
 {
 	off_t oldpos = ftello(f);
 	int l = 0;
@@ -730,8 +725,7 @@ FILE *f;
 }
 
 int
-next(buf)
-char *buf;
+next(char *buf)
 {
 	int i;
 	sscanf(buf, "%d", &i);
@@ -740,8 +734,7 @@ char *buf;
 }
 
 void
-ask(prompt)
-const char *prompt;
+ask(const char *prompt)
 {
 	char	inch;
 	int	n, cmsg, fd;
@@ -827,8 +820,7 @@ const char *prompt;
 }
 
 void
-gfrsub(infile)
-FILE *infile;
+gfrsub(FILE *infile)
 {
 	off_t frompos;
 	int count;
@@ -908,8 +900,7 @@ FILE *infile;
 }
 
 char *
-nxtfld(s)
-unsigned char *s;
+nxtfld(unsigned char *s)
 {
 	if (*s) while (*s && !isspace(*s)) s++;     /* skip over this field */
 	if (*s) while (*s && isspace(*s)) s++;    /* find start of next field */
diff --git a/usr.bin/ncplogin/ncplogin.c b/usr.bin/ncplogin/ncplogin.c
index 2a0dd8f56f0f..7bc2f66267ad 100644
--- a/usr.bin/ncplogin/ncplogin.c
+++ b/usr.bin/ncplogin/ncplogin.c
@@ -41,7 +41,9 @@ __FBSDID("$FreeBSD$");
 #include <err.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <strings.h>
+#include <string.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sysexits.h>
 #include <unistd.h>
 
diff --git a/usr.bin/nice/nice.c b/usr.bin/nice/nice.c
index 527e3f0689b8..93f6a98213a6 100644
--- a/usr.bin/nice/nice.c
+++ b/usr.bin/nice/nice.c
@@ -64,9 +64,7 @@ __FBSDID("$FreeBSD$");
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	long niceness = DEFNICE;
 	int ch;
@@ -108,7 +106,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 
 	(void)fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n");
diff --git a/usr.bin/pr/extern.h b/usr.bin/pr/extern.h
index 93efa652dbb3..da552c03e8e8 100644
--- a/usr.bin/pr/extern.h
+++ b/usr.bin/pr/extern.h
@@ -49,11 +49,11 @@ int	 inln(FILE *, char *, int, int *, int, int *);
 int	 inskip(FILE *, int, int);
 void	 mfail(void);
 int	 mulfile(int, char **);
-FILE	*nxtfile(int, char **, char **, char *, int);
+FILE	*nxtfile(int, char **, const char **, char *, int);
 int	 onecol(int, char **);
 int	 otln(char *, int, int *, int *, int);
 void	 pfail(void);
-int	 prhead(char *, char *, int);
+int	 prhead(char *, const char *, int);
 int	 prtail(int, int);
 int	 setup(int, char **);
 void	 terminate(int);
diff --git a/usr.bin/pr/pr.c b/usr.bin/pr/pr.c
index 169b6c9128c9..bef76c528313 100644
--- a/usr.bin/pr/pr.c
+++ b/usr.bin/pr/pr.c
@@ -103,7 +103,7 @@ char	schar;			/* text column separation character */
 int	sflag;			/* -s option for multiple columns */
 int	nohead;			/* do not write head and trailer */
 int	pgwd;			/* page width with multiple col output */
-char	*timefrmt;		/* time conversion string */
+const char *timefrmt;		/* time conversion string */
 
 /*
  * misc globals
@@ -187,7 +187,7 @@ onecol(int argc, char *argv[])
 	char *hbuf;
 	char *ohbuf;
 	FILE *inf;
-	char *fname;
+	const char *fname;
 	int mor;
 
 	if (nmwd)
@@ -339,7 +339,7 @@ vertcol(int argc, char *argv[])
 	char *buf;
 	char *hbuf;
 	char *ohbuf;
-	char *fname;
+	const char *fname;
 	FILE *inf;
 	int ips = 0;
 	int cps = 0;
@@ -649,7 +649,7 @@ horzcol(int argc, char *argv[])
 	char *buf;
 	char *hbuf;
 	char *ohbuf;
-	char *fname;
+	const char *fname;
 	FILE *inf;
 	int ips = 0;
 	int cps = 0;
@@ -795,7 +795,7 @@ mulfile(int argc, char *argv[])
 	char *buf;
 	char *hbuf;
 	char *ohbuf;
-	char *fname;
+	const char *fname;
 	int ips = 0;
 	int cps = 0;
 	int ops = 0;
@@ -1262,7 +1262,7 @@ inskip(FILE *inf, int pgcnt, int lncnt)
  *	dt	if set skips the date processing (used with -m)
  */
 FILE *
-nxtfile(int argc, char *argv[], char **fname, char *buf, int dt)
+nxtfile(int argc, char **argv, const char **fname, char *buf, int dt)
 {
 	FILE *inf = NULL;
 	struct timeval tv;
@@ -1423,7 +1423,7 @@ addnum(char *buf, int wdth, int line)
  *	pagcnt	page number
  */
 int
-prhead(char *buf, char *fname, int pagcnt)
+prhead(char *buf, const char *fname, int pagcnt)
 {
 	int ips = 0;
 	int ops = 0;
diff --git a/usr.bin/printenv/printenv.c b/usr.bin/printenv/printenv.c
index 5d5bebf1deb4..8ad23c7454da 100644
--- a/usr.bin/printenv/printenv.c
+++ b/usr.bin/printenv/printenv.c
@@ -62,13 +62,11 @@ void	usage(void);
  * February, 1979
  */
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	extern char **environ;
-	register char *cp, **ep;
-	register size_t len;
+	char *cp, **ep;
+	size_t len;
 	int ch;
 
 	while ((ch = getopt(argc, argv, "")) != -1)
@@ -98,7 +96,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: printenv [name]\n");
 	exit(1);
diff --git a/usr.bin/printf/printf.c b/usr.bin/printf/printf.c
index a63d6cd21efe..cc32e4f7c371 100644
--- a/usr.bin/printf/printf.c
+++ b/usr.bin/printf/printf.c
@@ -103,12 +103,10 @@ static char **gargv;
 
 int
 #ifdef BUILTIN
-progprintf(argc, argv)
+progprintf(int argc, char *argv[])
 #else
-main(argc, argv)
+main(int argc, char *argv[])
 #endif
-	int argc;
-	char *argv[];
 {
 	static const char *skip1, *skip2;
 	int ch, chopped, end, fieldwidth, haveprec, havewidth, precision, rval;
@@ -292,9 +290,7 @@ next:		for (start = fmt;; ++fmt) {
 }
 
 static char *
-mkquad(str, ch)
-	char *str;
-	int ch;
+mkquad(char *str, int ch)
 {
 	static char *copy;
 	static size_t copy_size;
@@ -325,12 +321,10 @@ mkquad(str, ch)
 }
 
 static int
-escape(fmt, percent)
-	register char *fmt;
-	int percent;
+escape(char *fmt, int percent)
 {
-	register char *store;
-	register int value, c;
+	char *store;
+	int value, c;
 
 	for (store = fmt; (c = *fmt); ++fmt, ++store) {
 		if (c != '\\') {
@@ -395,7 +389,7 @@ escape(fmt, percent)
 }
 
 static int
-getchr()
+getchr(void)
 {
 	if (!*gargv)
 		return ('\0');
@@ -403,7 +397,7 @@ getchr()
 }
 
 static const char *
-getstr()
+getstr(void)
 {
 	if (!*gargv)
 		return ("");
@@ -411,8 +405,7 @@ getstr()
 }
 
 static int
-getint(ip)
-	int *ip;
+getint(int *ip)
 {
 	quad_t val;
 	u_quad_t uval;
@@ -430,10 +423,7 @@ getint(ip)
 }
 
 static int
-getquads(qp, uqp, signedconv)
-	quad_t *qp;
-	u_quad_t *uqp;
-	int signedconv;
+getquads(quad_t *qp, u_quad_t *uqp, int signedconv)
 {
 	char *ep;
 	int rval;
@@ -472,8 +462,7 @@ getquads(qp, uqp, signedconv)
 }
 
 static int
-getdouble(dp)
-	double *dp;
+getdouble(double *dp)
 {
 	char *ep;
 	int rval;
@@ -503,9 +492,9 @@ getdouble(dp)
 }
 
 static int
-asciicode()
+asciicode(void)
 {
-	register int ch;
+	int ch;
 
 	ch = **gargv;
 	if (ch == '\'' || ch == '"')
@@ -515,7 +504,7 @@ asciicode()
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: printf format [arg ...]\n");
 }
diff --git a/usr.bin/rev/rev.c b/usr.bin/rev/rev.c
index 86d7276442f4..6a48d5e7e35e 100644
--- a/usr.bin/rev/rev.c
+++ b/usr.bin/rev/rev.c
@@ -58,9 +58,7 @@ __FBSDID("$FreeBSD$");
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	const char *filename, *p, *t;
 	FILE *fp;
@@ -108,7 +106,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: rev [file ...]\n");
 	exit(1);
diff --git a/usr.bin/rwall/rwall.c b/usr.bin/rwall/rwall.c
index ea5f77e5b7ca..861c8cffaa62 100644
--- a/usr.bin/rwall/rwall.c
+++ b/usr.bin/rwall/rwall.c
@@ -177,7 +177,7 @@ makemsg(const char *fname)
 	mbuf = malloc(mbufsize);
 	if (mbuf == NULL)
 		err(1, "out of memory");
-	if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
+	if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize)
 		err(1, "can't read temporary file");
 	close(fd);
 }
diff --git a/usr.bin/script/script.c b/usr.bin/script/script.c
index c58923980372..25c5bdc2c2f5 100644
--- a/usr.bin/script/script.c
+++ b/usr.bin/script/script.c
@@ -79,9 +79,7 @@ void	finish(void);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int cc;
 	struct termios rtt, stt;
@@ -199,7 +197,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 	    "usage: script [-a] [-q] [-k] [-t time] [file] [command]\n");
@@ -207,7 +205,7 @@ usage()
 }
 
 void
-finish()
+finish(void)
 {
 	pid_t pid;
 	int die, e, status;
@@ -229,8 +227,7 @@ finish()
 }
 
 void
-doshell(av)
-	char **av;
+doshell(char **av)
 {
 	const char *shell;
 
@@ -252,15 +249,14 @@ doshell(av)
 }
 
 void
-fail()
+fail(void)
 {
 	(void)kill(0, SIGTERM);
 	done(1);
 }
 
 void
-done(eno)
-	int eno;
+done(int eno)
 {
 	time_t tvec;
 
diff --git a/usr.bin/soelim/soelim.c b/usr.bin/soelim/soelim.c
index d25520cfa09f..d930fd94df31 100644
--- a/usr.bin/soelim/soelim.c
+++ b/usr.bin/soelim/soelim.c
@@ -70,9 +70,7 @@ static const char rcsid[] =
 int process(const char *);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 
 	argc--;
@@ -90,11 +88,10 @@ main(argc, argv)
 }
 
 int
-process(file)
-	const char *file;
+process(const char *file)
 {
-	register char *cp;
-	register int c;
+	char *cp;
+	int c;
 	char fname[BUFSIZ];
 	FILE *soee;
 	int isfile;
diff --git a/usr.bin/tee/tee.c b/usr.bin/tee/tee.c
index 5ac05db7ba8d..123a2de69ab5 100644
--- a/usr.bin/tee/tee.c
+++ b/usr.bin/tee/tee.c
@@ -66,13 +66,11 @@ void add(int, const char *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
-	register LIST *p;
-	register int n, fd, rval, wval;
-	register char *bp;
+	LIST *p;
+	int n, fd, rval, wval;
+	char *bp;
 	int append, ch, exitval;
 	char *buf;
 #define	BSIZE (8 * 1024)
@@ -125,16 +123,14 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: tee [-ai] [file ...]\n");
 	exit(1);
 }
 
 void
-add(fd, name)
-	int fd;
-	const char *name;
+add(int fd, const char *name)
 {
 	LIST *p;
 
diff --git a/usr.bin/time/time.c b/usr.bin/time/time.c
index 88178a390fa6..c7a248629a25 100644
--- a/usr.bin/time/time.c
+++ b/usr.bin/time/time.c
@@ -68,11 +68,9 @@ static void usage(void);
 static char decimal_point;
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
-	register int pid;
+	int pid;
 	int aflag, ch, hflag, lflag, status, pflag;
 	struct timeval before, after;
 	struct rusage ru;
@@ -223,7 +221,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr,
 	    "usage: time [-al] [-h|-p] [-o file] utility [argument ...]\n");
@@ -234,7 +232,7 @@ usage()
  * Return the frequency of the kernel's statistics clock.
  */
 static int
-getstathz()
+getstathz(void)
 {
 	struct clockinfo clockrate;
 	int mib[2];
@@ -249,10 +247,7 @@ getstathz()
 }
 
 static void
-humantime(out, sec, usec)
-	FILE *out;
-	long sec;
-	long usec;
+humantime(FILE *out, long sec, long usec)
 {
 	long days, hrs, mins;
 
diff --git a/usr.bin/touch/touch.c b/usr.bin/touch/touch.c
index 26ccf0e0271b..30d22ed35b99 100644
--- a/usr.bin/touch/touch.c
+++ b/usr.bin/touch/touch.c
@@ -65,9 +65,7 @@ void	stime_file(char *, struct timeval *);
 void	usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat sb;
 	struct timeval tv[2];
@@ -197,9 +195,7 @@ main(argc, argv)
 #define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
 
 void
-stime_arg1(arg, tvp)
-	char *arg;
-	struct timeval *tvp;
+stime_arg1(char *arg, struct timeval *tvp)
 {
 	time_t now;
 	struct tm *t;
@@ -260,10 +256,7 @@ terr:		errx(1,
 }
 
 void
-stime_arg2(arg, year, tvp)
-	char *arg;
-	int year;
-	struct timeval *tvp;
+stime_arg2(char *arg, int year, struct timeval *tvp)
 {
 	time_t now;
 	struct tm *t;
@@ -293,9 +286,7 @@ stime_arg2(arg, year, tvp)
 }
 
 void
-stime_file(fname, tvp)
-	char *fname;
-	struct timeval *tvp;
+stime_file(char *fname, struct timeval *tvp)
 {
 	struct stat sb;
 
@@ -306,10 +297,7 @@ stime_file(fname, tvp)
 }
 
 int
-rw(fname, sbp, force)
-	char *fname;
-	struct stat *sbp;
-	int force;
+rw(char *fname, struct stat *sbp, int force)
 {
 	int fd, needed_chmod, rval;
 	u_char byte;
@@ -358,7 +346,7 @@ err:			rval = 1;
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: touch [-acfhm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...\n");
 	exit(1);
diff --git a/usr.bin/tput/tput.c b/usr.bin/tput/tput.c
index 99bb90325fff..a74e36af8d34 100644
--- a/usr.bin/tput/tput.c
+++ b/usr.bin/tput/tput.c
@@ -62,9 +62,7 @@ static void   usage(void);
 static char **process(const char *, char *, char **);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int ch, exitval, n;
 	char *cptr, *term, buf[1024], tbuf[1024];
@@ -120,8 +118,7 @@ errx(2, "no terminal type specified and no TERM environmental variable.");
 }
 
 static void
-prlongname(buf)
-	char *buf;
+prlongname(char *buf)
 {
 	int savech;
 	char *p, *savep;
@@ -134,9 +131,7 @@ prlongname(buf)
 }
 
 static char **
-process(cap, str, argv)
-	const char *cap;
-	char *str, **argv;
+process(const char *cap, char *str, char **argv)
 {
 	static const char errfew[] =
 	    "not enough arguments (%d) for capability `%s'";
@@ -211,7 +206,7 @@ process(cap, str, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: tput [-T term] attribute ...\n");
 	exit(2);
diff --git a/usr.bin/tr/tr.c b/usr.bin/tr/tr.c
index 1fb5fd261134..407b4f439e61 100644
--- a/usr.bin/tr/tr.c
+++ b/usr.bin/tr/tr.c
@@ -106,9 +106,7 @@ static void setup(int *, char *, STR *, int, int);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	static int collorder[NCHARS], tmpmap[NCHARS];
 	int ch, cnt, lastch, *p;
@@ -280,12 +278,7 @@ main(argc, argv)
 }
 
 static void
-setup(string, arg, str, cflag, Cflag)
-	int *string;
-	char *arg;
-	STR *str;
-	int cflag;
-	int Cflag;
+setup(int *string, char *arg, STR *str, int cflag, int Cflag)
 {
 	int cnt, *p;
 
@@ -313,7 +306,7 @@ charcoll(const void *a, const void *b)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
 		"usage: tr [-Ccsu] string1 string2",
diff --git a/usr.bin/tset/tset.c b/usr.bin/tset/tset.c
index 5d3891ec674e..dc4c333e2f90 100644
--- a/usr.bin/tset/tset.c
+++ b/usr.bin/tset/tset.c
@@ -72,9 +72,7 @@ int	Lines, Columns;		/* window size */
 speed_t	Ospeed;
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 #ifdef TIOCGWINSZ
 	struct winsize win;
@@ -242,10 +240,7 @@ main(argc, argv)
  * Tell the user if a control key has been changed from the default value.
  */
 void
-report(name, which, def)
-	const char *name;
-	int which;
-	u_int def;
+report(const char *name, int which, u_int def)
 {
 	u_int old, new;
 
@@ -273,8 +268,7 @@ report(name, which, def)
  * This means that -e, -i and -k get default arguments supplied for them.
  */
 void
-obsolete(argv)
-	char *argv[];
+obsolete(char *argv[])
 {
 	for (; *argv; ++argv) {
 		if (argv[0][0] != '-' || (argv[1] && argv[1][0] != '-') ||
@@ -296,7 +290,7 @@ obsolete(argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "%s\n%s\n",
 "usage: tset  [-IQrSs] [-] [-e ch] [-i ch] [-k ch] [-m mapping] [terminal]",
diff --git a/usr.bin/tsort/tsort.c b/usr.bin/tsort/tsort.c
index 1c71b40fd3e6..ce35207f436a 100644
--- a/usr.bin/tsort/tsort.c
+++ b/usr.bin/tsort/tsort.c
@@ -113,12 +113,10 @@ void	 tsort(void);
 void	 usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
-	register BUF *b;
-	register int c, n;
+	BUF *b;
+	int c, n;
 	FILE *fp;
 	int bsize, ch, nused;
 	BUF bufs[2];
@@ -190,9 +188,7 @@ main(argc, argv)
 
 /* double the size of oldbuf and return a pointer to the new buffer. */
 void *
-grow_buf(bp, size)
-	void *bp;
-	size_t size;
+grow_buf(void *bp, size_t size)
 {
 	if ((bp = realloc(bp, size)) == NULL)
 		err(1, NULL);
@@ -204,10 +200,9 @@ grow_buf(bp, size)
  * the graph, then add them.
  */
 void
-add_arc(s1, s2)
-	char *s1, *s2;
+add_arc(char *s1, char *s2)
 {
-	register NODE *n1;
+	NODE *n1;
 	NODE *n2;
 	int bsize, i;
 
@@ -240,8 +235,7 @@ add_arc(s1, s2)
 
 /* Find a node in the graph (insert if not found) and return a pointer to it. */
 NODE *
-get_node(name)
-	char *name;
+get_node(char *name)
 {
 	DBT data, key;
 	NODE *n;
@@ -293,7 +287,7 @@ get_node(name)
  * Clear the NODEST flag from all nodes.
  */
 void
-clear_cycle()
+clear_cycle(void)
 {
 	NODE *n;
 
@@ -303,10 +297,10 @@ clear_cycle()
 
 /* do topological sort on graph */
 void
-tsort()
+tsort(void)
 {
-	register NODE *n, *next;
-	register int cnt, i;
+	NODE *n, *next;
+	int cnt, i;
 
 	while (graph != NULL) {
 		/*
@@ -366,11 +360,10 @@ tsort()
 
 /* print node and remove from graph (does not actually free node) */
 void
-remove_node(n)
-	register NODE *n;
+remove_node(NODE *n)
 {
-	register NODE **np;
-	register int i;
+	NODE **np;
+	int i;
 
 	(void)printf("%s\n", n->n_name);
 	for (np = n->n_arcs, i = n->n_narcs; --i >= 0; np++)
@@ -384,12 +377,10 @@ remove_node(n)
 
 /* look for the longest? cycle from node from to node to. */
 int
-find_cycle(from, to, longest_len, depth)
-	NODE *from, *to;
-	int depth, longest_len;
+find_cycle(NODE *from, NODE *to, int longest_len, int depth)
 {
-	register NODE **np;
-	register int i, len;
+	NODE **np;
+	int i, len;
 
 	/*
 	 * avoid infinite loops and ignore portions of the graph known
@@ -432,7 +423,7 @@ find_cycle(from, to, longest_len, depth)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: tsort [-dlq] [file]\n");
 	exit(1);
diff --git a/usr.bin/ul/ul.c b/usr.bin/ul/ul.c
index c4ffccf96085..de779b1c9b69 100644
--- a/usr.bin/ul/ul.c
+++ b/usr.bin/ul/ul.c
@@ -101,9 +101,7 @@ void outc(int);
 #define	PRINT(s)	if (s == NULL) /* void */; else tputs(s, 1, outchar)
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int c;
 	const char *termtype;
@@ -159,15 +157,14 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: ul [-i] [-t terminal] file...\n");
 	exit(1);
 }
 
 void
-filter(f)
-	FILE *f;
+filter(FILE *f)
 {
 	int c;
 
@@ -277,7 +274,7 @@ filter(f)
 }
 
 void
-flushln()
+flushln(void)
 {
 	int lastmode;
 	int i;
@@ -317,11 +314,11 @@ flushln()
  * We don't do anything with halfline ups and downs, or Greek.
  */
 void
-overstrike()
+overstrike(void)
 {
-	register int i;
+	int i;
 	char lbuf[256];
-	register char *cp = lbuf;
+	char *cp = lbuf;
 	int hadbold=0;
 
 	/* Set up overstrike buffer */
@@ -355,11 +352,11 @@ overstrike()
 }
 
 void
-iattr()
+iattr(void)
 {
-	register int i;
+	int i;
 	char lbuf[256];
-	register char *cp = lbuf;
+	char *cp = lbuf;
 
 	for (i=0; i<maxcol; i++)
 		switch (obuf[i].c_mode) {
@@ -379,7 +376,7 @@ iattr()
 }
 
 void
-initbuf()
+initbuf(void)
 {
 
 	bzero((char *)obuf, sizeof (obuf));	/* depends on NORMAL == 0 */
@@ -389,7 +386,7 @@ initbuf()
 }
 
 void
-fwd()
+fwd(void)
 {
 	int oldcol, oldmax;
 
@@ -401,7 +398,7 @@ fwd()
 }
 
 void
-reverse()
+reverse(void)
 {
 	upln++;
 	fwd();
@@ -411,7 +408,7 @@ reverse()
 }
 
 void
-initcap()
+initcap(void)
 {
 	static char tcapbuf[512];
 	char *bp = tcapbuf;
@@ -464,8 +461,7 @@ initcap()
 }
 
 int
-outchar(c)
-	int c;
+outchar(int c)
 {
 	return(putchar(c & 0177));
 }
@@ -473,8 +469,7 @@ outchar(c)
 static int curmode = 0;
 
 void
-outc(c)
-	int c;
+outc(int c)
 {
 	putchar(c);
 	if (must_use_uc && (curmode&UNDERL)) {
@@ -484,8 +479,7 @@ outc(c)
 }
 
 void
-setnewmode(newmode)
-	int newmode;
+setnewmode(int newmode)
 {
 	if (!iflag) {
 		if (curmode != NORMAL && newmode != NORMAL)
diff --git a/usr.bin/uname/uname.c b/usr.bin/uname/uname.c
index 6978cc44f829..458bf75ffbee 100644
--- a/usr.bin/uname/uname.c
+++ b/usr.bin/uname/uname.c
@@ -56,9 +56,7 @@ static const char sccsid[] = "@(#)uname.c	8.2 (Berkeley) 5/4/95";
 void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 #define	MFLAG	0x01
 #define	NFLAG	0x02
@@ -174,7 +172,7 @@ main(argc, argv)
 }
 
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: uname [-amnprsv]\n");
 	exit(1);
diff --git a/usr.bin/unexpand/unexpand.c b/usr.bin/unexpand/unexpand.c
index a1c565990a65..0d6b80c602ca 100644
--- a/usr.bin/unexpand/unexpand.c
+++ b/usr.bin/unexpand/unexpand.c
@@ -66,9 +66,7 @@ static void usage(void);
 static void tabify(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int ch, failed;
 	char *filename;
@@ -110,14 +108,14 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: unexpand [-a] [-t tablist] [file ...]\n");
 	exit(1);
 }
 
 static void
-tabify()
+tabify(void)
 {
 	int ch, dcol, doneline, limit, n, ocol;
 
@@ -199,8 +197,7 @@ tabify()
 }
 
 static void
-getstops(cp)
-	const char *cp;
+getstops(const char *cp)
 {
 	int i;
 
diff --git a/usr.bin/uniq/uniq.c b/usr.bin/uniq/uniq.c
index e7d964584bbc..4f3a7f4825b5 100644
--- a/usr.bin/uniq/uniq.c
+++ b/usr.bin/uniq/uniq.c
@@ -71,11 +71,9 @@ static void	 usage(void);
 int      stricoll(char *, char*);
 
 int
-main (argc, argv)
-	int argc;
-	char *argv[];
+main (int argc, char *argv[])
 {
-	register char *t1, *t2;
+	char *t1, *t2;
 	FILE *ifp, *ofp;
 	int ch;
 	char *prevline, *thisline, *p;
@@ -199,9 +197,7 @@ getline(char *buf, size_t buflen, FILE *fp)
  *	of the line.
  */
 void
-show(ofp, str)
-	FILE *ofp;
-	char *str;
+show(FILE *ofp, char *str)
 {
 
 	if (cflag && *str)
@@ -211,10 +207,9 @@ show(ofp, str)
 }
 
 char *
-skip(str)
-	register char *str;
+skip(char *str)
 {
-	register int nchars, nfields;
+	int nchars, nfields;
 
 	for (nfields = 0; *str != '\0' && nfields++ != numfields; ) {
 		while (isblank((unsigned char)*str))
@@ -227,8 +222,7 @@ skip(str)
 }
 
 FILE *
-file(name, mode)
-	const char *name, *mode;
+file(const char *name, const char *mode)
 {
 	FILE *fp;
 
@@ -238,8 +232,7 @@ file(name, mode)
 }
 
 void
-obsolete(argv)
-	char *argv[];
+obsolete(char *argv[])
 {
 	int len;
 	char *ap, *p, *start;
@@ -268,7 +261,7 @@ obsolete(argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr,
 "usage: uniq [-c | -d | -u] [-i] [-f fields] [-s chars] [input [output]]\n");
@@ -276,8 +269,7 @@ usage()
 }
 
 int
-stricoll(s1, s2)
-	char *s1, *s2;
+stricoll(char *s1, char *s2)
 {
 	char *p, line1[MAXLINELEN], line2[MAXLINELEN];
 
diff --git a/usr.bin/unvis/unvis.c b/usr.bin/unvis/unvis.c
index cfcf41bf8ca0..395c9adaefb0 100644
--- a/usr.bin/unvis/unvis.c
+++ b/usr.bin/unvis/unvis.c
@@ -55,9 +55,7 @@ void process(FILE *, const char *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	FILE *fp;
 	int ch;
@@ -85,18 +83,16 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: unvis [file ...]\n");
 	exit(1);
 }
 
 void
-process(fp, filename)
-	FILE *fp;
-	const char *filename;
+process(FILE *fp, const char *filename)
 {
-	register int offset = 0, c, ret;
+	int offset = 0, c, ret;
 	int state = 0;
 	char outc;
 
diff --git a/usr.bin/users/users.c b/usr.bin/users/users.c
index 597d0b200b8c..c90bfbdc149d 100644
--- a/usr.bin/users/users.c
+++ b/usr.bin/users/users.c
@@ -59,9 +59,7 @@ int scmp(const void *, const void *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	namebuf *names = NULL;
 	int ncnt = 0;
@@ -107,15 +105,14 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: users\n");
 	exit(1);
 }
 	
 int
-scmp(p, q)
-	const void *p, *q;
+scmp(const void *p, const void *q)
 {
 	return(strncmp(p, q, UT_NAMESIZE));
 }
diff --git a/usr.bin/vis/vis.c b/usr.bin/vis/vis.c
index a9c031e2a181..8a76d24f7d35 100644
--- a/usr.bin/vis/vis.c
+++ b/usr.bin/vis/vis.c
@@ -60,9 +60,7 @@ void process(FILE *);
 static void usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	FILE *fp;
 	int ch;
@@ -129,7 +127,7 @@ main(argc, argv)
 
 
 static void
-usage()
+usage(void)
 {
 #ifdef DEBUG
 	fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
@@ -140,13 +138,12 @@ usage()
 }
 
 void
-process(fp)
-	FILE *fp;
+process(FILE *fp)
 {
 	static int col = 0;
 	static char dummy[] = "\0";
-	register char *cp = dummy+1; /* so *(cp-1) starts out != '\n' */
-	register int c, rachar;
+	char *cp = dummy+1; /* so *(cp-1) starts out != '\n' */
+	int c, rachar;
 	char buff[5];
 
 	c = getc(fp);
diff --git a/usr.bin/what/what.c b/usr.bin/what/what.c
index 65bdb13e1b58..c22671564110 100644
--- a/usr.bin/what/what.c
+++ b/usr.bin/what/what.c
@@ -60,9 +60,7 @@ static void usage(void);
  * what
  */
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	int c;
 
@@ -90,16 +88,16 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: what [-s] [file ...]\n");
 	exit(1);
 }
 
 void
-search()
+search(void)
 {
-	register int c;
+	int c;
 
 	while ((c = getchar()) != EOF) {
 loop:		if (c != '@')
diff --git a/usr.bin/write/write.c b/usr.bin/write/write.c
index b21233bda3b7..ca8210c9b28f 100644
--- a/usr.bin/write/write.c
+++ b/usr.bin/write/write.c
@@ -74,11 +74,9 @@ void search_utmp(char *, char *, char *, uid_t);
 int utmp_chk(char *, char *);
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
-	register char *cp;
+	char *cp;
 	time_t atime;
 	uid_t myuid;
 	int msgsok, myttyfd;
@@ -136,7 +134,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "usage: write user [tty]\n");
 	exit(1);
@@ -147,8 +145,7 @@ usage()
  *     the given tty
  */
 int
-utmp_chk(user, tty)
-	char *user, *tty;
+utmp_chk(char *user, char *tty)
 {
 	struct utmp u;
 	int ufd;
@@ -179,9 +176,7 @@ utmp_chk(user, tty)
  * writing from, unless that's the only terminal with messages enabled.
  */
 void
-search_utmp(user, tty, mytty, myuid)
-	char *user, *tty, *mytty;
-	uid_t myuid;
+search_utmp(char *user, char *tty, char *mytty, uid_t myuid)
 {
 	struct utmp u;
 	time_t bestatime, atime;
@@ -233,10 +228,7 @@ search_utmp(user, tty, mytty, myuid)
  *     and the access time
  */
 int
-term_chk(tty, msgsokP, atimeP, showerror)
-	char *tty;
-	int *msgsokP, showerror;
-	time_t *atimeP;
+term_chk(char *tty, int *msgsokP, time_t *atimeP, int showerror)
 {
 	struct stat s;
 	char path[MAXPATHLEN];
@@ -256,9 +248,7 @@ term_chk(tty, msgsokP, atimeP, showerror)
  * do_write - actually make the connection
  */
 void
-do_write(tty, mytty, myuid)
-	char *tty, *mytty;
-	uid_t myuid;
+do_write(char *tty, char *mytty, uid_t myuid)
 {
 	const char *login;
 	char *nows;
@@ -298,8 +288,7 @@ do_write(tty, mytty, myuid)
  * done - cleanup and exit
  */
 void
-done(n)
-	int n __unused;
+done(int n __unused)
 {
 	(void)printf("EOF\r\n");
 	exit(0);
@@ -310,8 +299,7 @@ done(n)
  *     turns \n into \r\n
  */
 void
-wr_fputs(s)
-	unsigned char *s;
+wr_fputs(unsigned char *s)
 {
 
 #define	PUTC(c)	if (putchar(c) == EOF) err(1, NULL);
diff --git a/usr.bin/xinstall/xinstall.c b/usr.bin/xinstall/xinstall.c
index 1313e0b3bf57..445d3f8e14e4 100644
--- a/usr.bin/xinstall/xinstall.c
+++ b/usr.bin/xinstall/xinstall.c
@@ -100,9 +100,7 @@ int	trymmap(int);
 void	usage(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	struct stat from_sb, to_sb;
 	mode_t *set;
@@ -238,8 +236,7 @@ main(argc, argv)
 }
 
 u_long
-numeric_id(name, type)
-	const char *name, *type;
+numeric_id(const char *name, const char *type)
 {
 	u_long val;
 	char *ep;
@@ -262,10 +259,7 @@ numeric_id(name, type)
  *	build a path name and install the file
  */
 void
-install(from_name, to_name, fset, flags)
-	const char *from_name, *to_name;
-	u_long fset;
-	u_int flags;
+install(const char *from_name, const char *to_name, u_long fset, u_int flags)
 {
 	struct stat from_sb, temp_sb, to_sb;
 	struct utimbuf utb;
@@ -575,10 +569,7 @@ compare(int from_fd, const char *from_name __unused, size_t from_len,
  *	create a temporary file based on path and open it
  */
 int
-create_tempfile(path, temp, tsize)
-	const char *path;
-	char *temp;
-	size_t tsize;
+create_tempfile(const char *path, char *temp, size_t tsize)
 {
 	char *p;
 
@@ -598,10 +589,7 @@ create_tempfile(path, temp, tsize)
  *	create a new file, overwriting an existing one if necessary
  */
 int
-create_newfile(path, target, sbp)
-	const char *path;
-	int target;
-	struct stat *sbp;
+create_newfile(const char *path, int target, struct stat *sbp)
 {
 	char backup[MAXPATHLEN];
 
@@ -638,12 +626,10 @@ create_newfile(path, target, sbp)
  *	copy from one file to another
  */
 void
-copy(from_fd, from_name, to_fd, to_name, size)
-	register int from_fd, to_fd;
-	const char *from_name, *to_name;
-	off_t size;
+copy(int from_fd, const char *from_name, int to_fd, const char *to_name,
+    off_t size)
 {
-	register int nr, nw;
+	int nr, nw;
 	int serrno;
 	char *p, buf[MAXBSIZE];
 	int done_copy;
@@ -693,8 +679,7 @@ copy(from_fd, from_name, to_fd, to_name, size)
  *	use strip(1) to strip the target file
  */
 void
-strip(to_name)
-	const char *to_name;
+strip(const char *to_name)
 {
 	const char *stripbin;
 	int serrno, status;
@@ -726,10 +711,9 @@ strip(to_name)
  *	build directory heirarchy
  */
 void
-install_dir(path)
-	char *path;
+install_dir(char *path)
 {
-	register char *p;
+	char *p;
 	struct stat sb;
 	int ch;
 
@@ -761,7 +745,7 @@ install_dir(path)
  *	print a usage message and die
  */
 void
-usage()
+usage(void)
 {
 	(void)fprintf(stderr, "\
 usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
@@ -778,8 +762,7 @@ usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
  *	return true (1) if mmap should be tried, false (0) if not.
  */
 int
-trymmap(fd)
-	int fd;
+trymmap(int fd)
 {
 /*
  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
diff --git a/usr.bin/xstr/xstr.c b/usr.bin/xstr/xstr.c
index dac896f619c3..2ffbc72f632b 100644
--- a/usr.bin/xstr/xstr.c
+++ b/usr.bin/xstr/xstr.c
@@ -97,9 +97,7 @@ void prstr(char *);
 void xsdotc(void);
 
 int
-main(argc, argv)
-	int argc;
-	char *argv[];
+main(int argc, char *argv[])
 {
 	int c;
 
@@ -146,7 +144,7 @@ main(argc, argv)
 }
 
 static void
-usage()
+usage(void)
 {
 	fprintf(stderr, "usage: xstr [-v] [-c] [-] [name ...]\n");
 	exit (1);
@@ -155,8 +153,7 @@ usage()
 char linebuf[BUFSIZ];
 
 void
-process(name)
-	const char *name;
+process(const char *name)
 {
 	char *cp;
 	int c;
@@ -224,8 +221,7 @@ out:
 }
 
 off_t
-yankstr(cpp)
-	char **cpp;
+yankstr(char **cpp)
 {
 	char *cp = *cpp;
 	int c, ch;
@@ -283,14 +279,13 @@ out:
 }
 
 int
-octdigit(c)
-	char c;
+octdigit(char c)
 {
 	return (isdigit(c) && c != '8' && c != '9');
 }
 
 void
-inithash()
+inithash(void)
 {
 	char buf[BUFSIZ];
 	FILE *mesgread = fopen(strings, "r");
@@ -307,10 +302,7 @@ inithash()
 }
 
 int
-fgetNUL(obuf, rmdr, file)
-	char *obuf;
-	int rmdr;
-	FILE *file;
+fgetNUL(char *obuf, int rmdr, FILE *file)
 {
 	int c;
 	char *buf = obuf;
@@ -322,8 +314,7 @@ fgetNUL(obuf, rmdr, file)
 }
 
 int
-xgetc(file)
-	FILE *file;
+xgetc(FILE *file)
 {
 
 	tellpt++;
@@ -340,9 +331,7 @@ struct	hash {
 } bucket[BUCKETS];
 
 off_t
-hashit(str, new)
-	char *str;
-	int new;
+hashit(char *str, int new)
 {
 	int i;
 	struct hash *hp, *hp0;
@@ -367,7 +356,7 @@ hashit(str, new)
 }
 
 void
-flushsh()
+flushsh(void)
 {
 	int i;
 	struct hash *hp;
@@ -400,10 +389,7 @@ flushsh()
 }
 
 void
-found(new, off, str)
-	int new;
-	off_t off;
-	char *str;
+found(int new, off_t off, char *str)
 {
 	if (vflg == 0)
 		return;
@@ -416,8 +402,7 @@ found(new, off, str)
 }
 
 void
-prstr(cp)
-	char *cp;
+prstr(char *cp)
 {
 	int c;
 
@@ -433,7 +418,7 @@ prstr(cp)
 }
 
 void
-xsdotc()
+xsdotc(void)
 {
 	FILE *strf = fopen(strings, "r");
 	FILE *xdotcf;
@@ -468,8 +453,7 @@ out:
 }
 
 char
-lastchr(cp)
-	char *cp;
+lastchr(char *cp)
 {
 
 	while (cp[0] && cp[1])
@@ -478,8 +462,7 @@ lastchr(cp)
 }
 
 int
-istail(str, of)
-	char *str, *of;
+istail(char *str, char *of)
 {
 	int d = strlen(of) - strlen(str);
 
@@ -489,8 +472,7 @@ istail(str, of)
 }
 
 void
-onintr(dummy)
-	int dummy __unused;
+onintr(int dummy __unused)
 {
 
 	ignore(signal(SIGINT, SIG_IGN));
diff --git a/usr.bin/yes/yes.c b/usr.bin/yes/yes.c
index 80641aa3938f..0eb060ddebb3 100644
--- a/usr.bin/yes/yes.c
+++ b/usr.bin/yes/yes.c
@@ -48,9 +48,7 @@ static const char rcsid[] = "$FreeBSD$";
 #include <stdio.h>
 
 int
-main(argc, argv)
-	int argc;
-	char **argv;
+main(int argc, char **argv)
 {
 	if (argc > 1)
 		for(;;)