diff --git a/contrib/tcp_wrappers/clean_exit.c b/contrib/tcp_wrappers/clean_exit.c
--- a/contrib/tcp_wrappers/clean_exit.c
+++ b/contrib/tcp_wrappers/clean_exit.c
@@ -21,8 +21,7 @@
 
 /* clean_exit - clean up and exit */
 
-void    clean_exit(request)
-struct request_info *request;
+void    clean_exit(struct request_info *request)
 {
 
     /*
diff --git a/contrib/tcp_wrappers/diag.c b/contrib/tcp_wrappers/diag.c
--- a/contrib/tcp_wrappers/diag.c
+++ b/contrib/tcp_wrappers/diag.c
@@ -29,11 +29,7 @@
 
 /* tcpd_diag - centralize error reporter */
 
-static void tcpd_diag(severity, tag, format, ap)
-int     severity;
-char   *tag;
-char   *format;
-va_list ap;
+static void tcpd_diag(int severity, char *tag, char *format, va_list ap)
 {
     char    fmt[BUFSIZ];
 
diff --git a/contrib/tcp_wrappers/environ.c b/contrib/tcp_wrappers/environ.c
--- a/contrib/tcp_wrappers/environ.c
+++ b/contrib/tcp_wrappers/environ.c
@@ -37,8 +37,7 @@
 
 /* namelength - determine length of name in "name=whatever" */
 
-static int namelength(name)
-char   *name;
+static int namelength(char *name)
 {
     char   *equal;
 
@@ -48,9 +47,7 @@
 
 /* findenv - given name, locate name=value */
 
-static char **findenv(name, len)
-char   *name;
-int     len;
+static char **findenv(char *name, int len)
 {
     char  **envp;
 
@@ -62,8 +59,7 @@
 
 /* getenv - given name, locate value */
 
-char   *getenv(name)
-char   *name;
+char   *getenv(char *name)
 {
     int     len = namelength(name);
     char  **envp = findenv(name, len);
@@ -73,8 +69,7 @@
 
 /* putenv - update or append environment (name,value) pair */
 
-int     putenv(nameval)
-char   *nameval;
+int     putenv(char *nameval)
 {
     char   *equal = strchr(nameval, '=');
     char   *value = (equal ? equal : "");
@@ -84,8 +79,7 @@
 
 /* unsetenv - remove variable from environment */
 
-void    unsetenv(name)
-char   *name;
+void    unsetenv(char *name)
 {
     char  **envp;
 
@@ -96,10 +90,7 @@
 
 /* setenv - update or append environment (name,value) pair */
 
-int     setenv(name, value, clobber)
-char   *name;
-char   *value;
-int     clobber;
+int     setenv(char *name, char *value, int clobber)
 {
     char   *destination;
     char  **envp;
@@ -133,9 +124,7 @@
 
 /* cmalloc - malloc and copy block of memory */
 
-static char *cmalloc(new_len, old, old_len)
-char   *old;
-int     old_len;
+static char *cmalloc(int new_len, char *old, int old_len)
 {
     char   *new = malloc(new_len);
 
@@ -146,8 +135,7 @@
 
 /* addenv - append environment entry */
 
-static int addenv(nameval)
-char   *nameval;
+static int addenv(char *nameval)
 {
     char  **envp;
     int     n_used;			/* number of environment entries */
@@ -190,9 +178,7 @@
 	printf("%s\n", *envp);
 }
 
-int     main(argc, argv)
-int     argc;
-char  **argv;
+int     main(int argc, char **argv)
 {
     char   *cp;
     int     changed = 0;
diff --git a/contrib/tcp_wrappers/eval.c b/contrib/tcp_wrappers/eval.c
--- a/contrib/tcp_wrappers/eval.c
+++ b/contrib/tcp_wrappers/eval.c
@@ -42,8 +42,7 @@
 
 /* eval_user - look up user name */
 
-char   *eval_user(request)
-struct request_info *request;
+char   *eval_user(struct request_info *request)
 {
     if (request->user[0] == 0) {
 	strcpy(request->user, unknown);
@@ -55,8 +54,7 @@
 
 /* eval_hostaddr - look up printable address */
 
-char   *eval_hostaddr(host)
-struct host_info *host;
+char   *eval_hostaddr(struct host_info *host)
 {
     if (host->addr[0] == 0) {
 	strcpy(host->addr, unknown);
@@ -68,8 +66,7 @@
 
 /* eval_hostname - look up host name */
 
-char   *eval_hostname(host)
-struct host_info *host;
+char   *eval_hostname(struct host_info *host)
 {
     if (host->name[0] == 0) {
 	strcpy(host->name, unknown);
@@ -81,8 +78,7 @@
 
 /* eval_hostinfo - return string with host name (preferred) or address */
 
-char   *eval_hostinfo(host)
-struct host_info *host;
+char   *eval_hostinfo(struct host_info *host)
 {
     char   *hostname;
 
@@ -100,8 +96,7 @@
 
 /* eval_client - return string with as much about the client as we know */
 
-char   *eval_client(request)
-struct request_info *request;
+char   *eval_client(struct request_info *request)
 {
     static char both[2 * STRING_LENGTH];
     char   *hostinfo = eval_hostinfo(request->client);
@@ -120,8 +115,7 @@
 
 /* eval_server - return string with as much about the server as we know */
 
-char   *eval_server(request)
-struct request_info *request;
+char   *eval_server(struct request_info *request)
 {
     static char both[2 * STRING_LENGTH];
     char   *host = eval_hostinfo(request->server);
diff --git a/contrib/tcp_wrappers/fakelog.c b/contrib/tcp_wrappers/fakelog.c
--- a/contrib/tcp_wrappers/fakelog.c
+++ b/contrib/tcp_wrappers/fakelog.c
@@ -17,20 +17,14 @@
 
 /* ARGSUSED */
 
-void openlog(name, logopt, facility)
-char   *name;
-int     logopt;
-int     facility;
+void openlog(char *name, int logopt, int facility)
 {
     /* void */
 }
 
 /* vsyslog - format one record */
 
-void vsyslog(severity, fmt, ap)
-int     severity;
-char   *fmt;
-va_list ap;
+void vsyslog(int severity, char *fmt, va_list ap)
 {
     char    buf[BUFSIZ];
 
diff --git a/contrib/tcp_wrappers/fix_options.c b/contrib/tcp_wrappers/fix_options.c
--- a/contrib/tcp_wrappers/fix_options.c
+++ b/contrib/tcp_wrappers/fix_options.c
@@ -35,8 +35,7 @@
 /* fix_options - get rid of IP-level socket options */
 
 void
-fix_options(request)
-struct request_info *request;
+fix_options(struct request_info *request)
 {
 #ifdef IP_OPTIONS
     unsigned char optbuf[BUFFER_SIZE / 3], *cp;
diff --git a/contrib/tcp_wrappers/fromhost.c b/contrib/tcp_wrappers/fromhost.c
--- a/contrib/tcp_wrappers/fromhost.c
+++ b/contrib/tcp_wrappers/fromhost.c
@@ -28,8 +28,7 @@
 
 /* fromhost - find out what network API we should use */
 
-void    fromhost(request)
-struct request_info *request;
+void    fromhost(struct request_info *request)
 {
 
     /*
diff --git a/contrib/tcp_wrappers/hosts_access.c b/contrib/tcp_wrappers/hosts_access.c
--- a/contrib/tcp_wrappers/hosts_access.c
+++ b/contrib/tcp_wrappers/hosts_access.c
@@ -108,8 +108,7 @@
 
 /* hosts_access - host access control facility */
 
-int     hosts_access(request)
-struct request_info *request;
+int     hosts_access(struct request_info *request)
 {
     int     verdict;
 
@@ -142,9 +141,7 @@
 
 /* table_match - match table entries with (daemon, client) pair */
 
-static int table_match(table, request)
-char   *table;
-struct request_info *request;
+static int table_match(char *table, struct request_info *request)
 {
     FILE   *fp;
     char    sv_list[BUFLEN];		/* becomes list of daemons */
@@ -237,9 +234,7 @@
 
 /* server_match - match server information */
 
-static int server_match(tok, request)
-char   *tok;
-struct request_info *request;
+static int server_match(char *tok, struct request_info *request)
 {
     char   *host;
 
@@ -253,9 +248,7 @@
 
 /* client_match - match client information */
 
-static int client_match(tok, request)
-char   *tok;
-struct request_info *request;
+static int client_match(char *tok, struct request_info *request)
 {
     char   *host;
 
@@ -269,9 +262,7 @@
 
 /* hostfile_match - look up host patterns from file */
 
-static int hostfile_match(path, host)
-char   *path;
-struct host_info *host;
+static int hostfile_match(char *path, struct host_info *host)
 {
     char    tok[BUFSIZ];
     int     match = NO;
@@ -289,9 +280,7 @@
 
 /* host_match - match host name and/or address against pattern */
 
-static int host_match(tok, host)
-char   *tok;
-struct host_info *host;
+static int host_match(char *tok, struct host_info *host)
 {
     char   *mask;
 
@@ -332,9 +321,7 @@
 
 /* string_match - match string against pattern */
 
-static int string_match(tok, string)
-char   *tok;
-char   *string;
+static int string_match(char *tok, char *string)
 {
     int     n;
 
@@ -393,22 +380,16 @@
 /* masked_match - match address against netnumber/netmask */
 
 #ifdef INET6
-static int masked_match(net_tok, mask_tok, string)
-char   *net_tok;
-char   *mask_tok;
-char   *string;
+static int masked_match(char *net_tok, char *mask_tok, char *string)
 {
     return (masked_match4(net_tok, mask_tok, string) ||
 	    masked_match6(net_tok, mask_tok, string));
 }
 
-static int masked_match4(net_tok, mask_tok, string)
+static int masked_match4(char *net_tok, char *mask_tok, char *string)
 #else
-static int masked_match(net_tok, mask_tok, string)
+static int masked_match(char *net_tok, char *mask_tok, char *string)
 #endif
-char   *net_tok;
-char   *mask_tok;
-char   *string;
 {
 #ifdef INET6
     u_int32_t net;
@@ -439,10 +420,7 @@
 }
 
 #ifdef INET6
-static int masked_match6(net_tok, mask_tok, string)
-char   *net_tok;
-char   *mask_tok;
-char   *string;
+static int masked_match6(char *net_tok, char *mask_tok, char *string)
 {
     struct addrinfo hints, *res;
     struct sockaddr_in6 net, addr;
diff --git a/contrib/tcp_wrappers/hosts_ctl.c b/contrib/tcp_wrappers/hosts_ctl.c
--- a/contrib/tcp_wrappers/hosts_ctl.c
+++ b/contrib/tcp_wrappers/hosts_ctl.c
@@ -21,11 +21,7 @@
 
 /* hosts_ctl - limited interface to the hosts_access() routine */
 
-int     hosts_ctl(daemon, name, addr, user)
-char   *daemon;
-char   *name;
-char   *addr;
-char   *user;
+int     hosts_ctl(char *daemon, char *name, char *addr, char *user)
 {
     struct request_info request;
 
diff --git a/contrib/tcp_wrappers/inetcf.c b/contrib/tcp_wrappers/inetcf.c
--- a/contrib/tcp_wrappers/inetcf.c
+++ b/contrib/tcp_wrappers/inetcf.c
@@ -55,8 +55,7 @@
 
 /* inet_conf - read in and examine inetd.conf (or tlid.conf) entries */
 
-char   *inet_cfg(conf)
-char   *conf;
+char   *inet_cfg(char *conf)
 {
     char    buf[BUFSIZ];
     FILE   *fp;
@@ -159,11 +158,7 @@
 
 /* inet_chk - examine one inetd.conf (tlid.conf?) entry */
 
-static void inet_chk(protocol, path, arg0, arg1)
-char   *protocol;
-char   *path;
-char   *arg0;
-char   *arg1;
+static void inet_chk(char *protocol, char *path, char *arg0, char *arg1)
 {
     char    daemon[BUFSIZ];
     struct stat st;
@@ -274,9 +269,7 @@
 
 /* inet_set - remember service status */
 
-void    inet_set(name, type)
-char   *name;
-int     type;
+void    inet_set(char *name, int type)
 {
     struct inet_ent *ip =
     (struct inet_ent *) malloc(sizeof(struct inet_ent) + strlen(name));
@@ -293,8 +286,7 @@
 
 /* inet_get - look up service status */
 
-int     inet_get(name)
-char   *name;
+int     inet_get(char *name)
 {
     struct inet_ent *ip;
 
@@ -310,8 +302,7 @@
 
 /* base_name - compute last pathname component */
 
-static char *base_name(path)
-char   *path;
+static char *base_name(char *path)
 {
     char   *cp;
 
diff --git a/contrib/tcp_wrappers/misc.c b/contrib/tcp_wrappers/misc.c
--- a/contrib/tcp_wrappers/misc.c
+++ b/contrib/tcp_wrappers/misc.c
@@ -25,10 +25,7 @@
 
 /* xgets - fgets() with backslash-newline stripping */
 
-char   *xgets(ptr, len, fp)
-char   *ptr;
-int     len;
-FILE   *fp;
+char   *xgets(char *ptr, int len, FILE *fp)
 {
     int     got;
     char   *start = ptr;
@@ -52,9 +49,7 @@
 
 /* split_at - break string at delimiter or return NULL */
 
-char   *split_at(string, delimiter)
-char   *string;
-int     delimiter;
+char   *split_at(char *string, int delimiter)
 {
     char   *cp;
 
@@ -87,8 +82,7 @@
 
 /* dot_quad_addr - convert dotted quad to internal form */
 
-unsigned long dot_quad_addr(str)
-char   *str;
+unsigned long dot_quad_addr(char *str)
 {
     int     in_run = 0;
     int     runs = 0;
diff --git a/contrib/tcp_wrappers/miscd.c b/contrib/tcp_wrappers/miscd.c
--- a/contrib/tcp_wrappers/miscd.c
+++ b/contrib/tcp_wrappers/miscd.c
@@ -43,9 +43,7 @@
 int     allow_severity = SEVERITY;	/* run-time adjustable */
 int     deny_severity = LOG_WARNING;	/* ditto */
 
-main(argc, argv)
-int     argc;
-char  **argv;
+main(int argc, char **argv)
 {
     struct request_info request;
     char    path[MAXPATHNAMELEN];
diff --git a/contrib/tcp_wrappers/myvsyslog.c b/contrib/tcp_wrappers/myvsyslog.c
--- a/contrib/tcp_wrappers/myvsyslog.c
+++ b/contrib/tcp_wrappers/myvsyslog.c
@@ -18,10 +18,7 @@
 #include "tcpd.h"
 #include "mystdarg.h"
 
-myvsyslog(severity, format, ap)
-int     severity;
-char   *format;
-va_list ap;
+myvsyslog(int severity, char *format, va_list ap)
 {
     char    fbuf[BUFSIZ];
     char    obuf[3 * STRING_LENGTH];
diff --git a/contrib/tcp_wrappers/ncr.c b/contrib/tcp_wrappers/ncr.c
--- a/contrib/tcp_wrappers/ncr.c
+++ b/contrib/tcp_wrappers/ncr.c
@@ -24,8 +24,7 @@
 
 /* fromhost - tear down the streams stack then rebuild it */
 
-void    fromhost(request)
-struct request_info *request;
+void    fromhost(struct request_info *request)
 {
     int     i;
     int     num_mod;
diff --git a/contrib/tcp_wrappers/options.c b/contrib/tcp_wrappers/options.c
--- a/contrib/tcp_wrappers/options.c
+++ b/contrib/tcp_wrappers/options.c
@@ -95,7 +95,8 @@
 
 struct option {
     char   *name;			/* keyword name, case is ignored */
-    void  (*func) ();			/* function that does the real work */
+    void  (*func) (char *value, struct request_info *request);
+					/* function that does the real work */
     int     flags;			/* see below... */
 };
 
@@ -132,9 +133,7 @@
 
 /* process_options - process access control options */
 
-void    process_options(options, request)
-char   *options;
-struct request_info *request;
+void    process_options(char *options, struct request_info *request)
 {
     char   *key;
     char   *value;
@@ -218,9 +217,7 @@
 
 /* banners_option - expand %<char>, terminate each line with CRLF */
 
-static void banners_option(value, request)
-char   *value;
-struct request_info *request;
+static void banners_option(char *value, struct request_info *request)
 {
     char    path[MAXPATHNAMELEN];
     char    ibuf[BUFSIZ];
@@ -250,9 +247,7 @@
 
 /* ARGSUSED */
 
-static void group_option(value, request)
-char   *value;
-struct request_info *request;
+static void group_option(char *value, struct request_info *request)
 {
     struct group *grp;
     struct group *getgrnam();
@@ -269,9 +264,7 @@
 
 /* ARGSUSED */
 
-static void user_option(value, request)
-char   *value;
-struct request_info *request;
+static void user_option(char *value, struct request_info *request)
 {
     struct passwd *pwd;
     struct passwd *getpwnam();
@@ -291,9 +284,7 @@
 
 /* ARGSUSED */
 
-static void umask_option(value, request)
-char   *value;
-struct request_info *request;
+static void umask_option(char *value, struct request_info *request)
 {
     unsigned mask;
     char    junk;
@@ -307,9 +298,7 @@
 
 /* ARGSUSED */
 
-static void spawn_option(value, request)
-char   *value;
-struct request_info *request;
+static void spawn_option(char *value, struct request_info *request)
 {
     if (dry_run == 0)
 	shell_cmd(value);
@@ -319,9 +308,7 @@
 
 /* ARGSUSED */
 
-static void linger_option(value, request)
-char   *value;
-struct request_info *request;
+static void linger_option(char *value, struct request_info *request)
 {
     struct linger linger;
     char    junk;
@@ -341,9 +328,7 @@
 
 /* ARGSUSED */
 
-static void keepalive_option(value, request)
-char   *value;
-struct request_info *request;
+static void keepalive_option(char *value, struct request_info *request)
 {
     static int on = 1;
 
@@ -356,9 +341,7 @@
 
 /* ARGSUSED */
 
-static void nice_option(value, request)
-char   *value;
-struct request_info *request;
+static void nice_option(char *value, struct request_info *request)
 {
     int     niceval = 10;
     char    junk;
@@ -371,9 +354,7 @@
 
 /* twist_option - replace process by shell command */
 
-static void twist_option(value, request)
-char   *value;
-struct request_info *request;
+static void twist_option(char *value, struct request_info *request)
 {
     char   *error;
 
@@ -409,9 +390,7 @@
 
 /* rfc931_option - look up remote user name */
 
-static void rfc931_option(value, request)
-char   *value;
-struct request_info *request;
+static void rfc931_option(char *value, struct request_info *request)
 {
     int     timeout;
     char    junk;
@@ -428,9 +407,7 @@
 
 /* ARGSUSED */
 
-static void setenv_option(value, request)
-char   *value;
-struct request_info *request;
+static void setenv_option(char *value, struct request_info *request)
 {
     char   *var_value;
 
@@ -442,9 +419,7 @@
 
 /* severity_map - lookup facility or severity value */
 
-static int severity_map(table, name)
-const CODE   *table;
-char   *name;
+static int severity_map(const CODE *table, char *name)
 {
     const CODE *t;
     int ret = -1;
@@ -464,9 +439,7 @@
 
 /* ARGSUSED */
 
-static void severity_option(value, request)
-char   *value;
-struct request_info *request;
+static void severity_option(char *value, struct request_info *request)
 {
     char   *level = split_at(value, '.');
 
@@ -477,8 +450,7 @@
 
 /* get_field - return pointer to next field in string */
 
-static char *get_field(string)
-char   *string;
+static char *get_field(char *string)
 {
     static char *last = "";
     char   *src;
@@ -520,8 +492,7 @@
 
 /* chop_string - strip leading and trailing blanks from string */
 
-static char *chop_string(string)
-register char *string;
+static char *chop_string(register char *string)
 {
     char   *start = 0;
     char   *end;
diff --git a/contrib/tcp_wrappers/percent_m.c b/contrib/tcp_wrappers/percent_m.c
--- a/contrib/tcp_wrappers/percent_m.c
+++ b/contrib/tcp_wrappers/percent_m.c
@@ -19,9 +19,7 @@
 
 #include "mystdarg.h"
 
-char   *percent_m(obuf, ibuf)
-char   *obuf;
-char   *ibuf;
+char   *percent_m(char *obuf, char *ibuf)
 {
     char   *bp = obuf;
     char   *cp = ibuf;
diff --git a/contrib/tcp_wrappers/percent_x.c b/contrib/tcp_wrappers/percent_x.c
--- a/contrib/tcp_wrappers/percent_x.c
+++ b/contrib/tcp_wrappers/percent_x.c
@@ -29,11 +29,8 @@
 
 /* percent_x - do %<char> expansion, abort if result buffer is too small */
 
-char   *percent_x(result, result_len, string, request)
-char   *result;
-int     result_len;
-char   *string;
-struct request_info *request;
+char   *percent_x(char *result, int result_len, char *string,
+    struct request_info *request)
 {
     char   *bp = result;
     char   *end = result + result_len - 1;	/* end of result buffer */
diff --git a/contrib/tcp_wrappers/ptx.c b/contrib/tcp_wrappers/ptx.c
--- a/contrib/tcp_wrappers/ptx.c
+++ b/contrib/tcp_wrappers/ptx.c
@@ -35,8 +35,7 @@
 
 /* tli_host - determine TLI endpoint info, PTX version */
 
-void    tli_host(request)
-struct request_info *request;
+void    tli_host(struct request_info *request)
 {
     static struct sockaddr_in client;
     static struct sockaddr_in server;
@@ -81,8 +80,7 @@
 
 /* ptx_sink - absorb unreceived IP datagram */
 
-static void ptx_sink(fd)
-int     fd;
+static void ptx_sink(int fd)
 {
     char    buf[BUFSIZ];
     struct sockaddr sa;
diff --git a/contrib/tcp_wrappers/refuse.c b/contrib/tcp_wrappers/refuse.c
--- a/contrib/tcp_wrappers/refuse.c
+++ b/contrib/tcp_wrappers/refuse.c
@@ -24,8 +24,7 @@
 
 /* refuse - refuse request */
 
-void    refuse(request)
-struct request_info *request;
+void    refuse(struct request_info *request)
 {
 #ifdef INET6
     syslog(deny_severity, "refused connect from %s (%s)",
diff --git a/contrib/tcp_wrappers/rfc931.c b/contrib/tcp_wrappers/rfc931.c
--- a/contrib/tcp_wrappers/rfc931.c
+++ b/contrib/tcp_wrappers/rfc931.c
@@ -44,10 +44,7 @@
 
 /* fsocket - open stdio stream on top of socket */
 
-static FILE *fsocket(domain, type, protocol)
-int     domain;
-int     type;
-int     protocol;
+static FILE *fsocket(int domain, int type, int protocol)
 {
     int     s;
     FILE   *fp;
@@ -73,15 +70,12 @@
 
 /* rfc931 - return remote user name, given socket structures */
 
-void    rfc931(rmt_sin, our_sin, dest)
 #ifdef INET6
-struct sockaddr *rmt_sin;
-struct sockaddr *our_sin;
+void    rfc931(struct sockaddr *rmt_sin, struct sockaddr *our_sin, char *dest)
 #else
-struct sockaddr_in *rmt_sin;
-struct sockaddr_in *our_sin;
+void    rfc931(struct sockaddr_in *rmt_sin, struct sockaddr_in *our_sin,
+	char *dest)
 #endif
-char   *dest;
 {
     unsigned rmt_port;
     unsigned our_port;
diff --git a/contrib/tcp_wrappers/safe_finger.c b/contrib/tcp_wrappers/safe_finger.c
--- a/contrib/tcp_wrappers/safe_finger.c
+++ b/contrib/tcp_wrappers/safe_finger.c
@@ -49,9 +49,7 @@
     exit(0);
 }
 
-main(argc, argv)
-int     argc;
-char  **argv;
+main(int argc, char **argv)
 {
     int     c;
     int     line_length = 0;
@@ -135,8 +133,7 @@
 
 /* perror_exit - report system error text and terminate */
 
-void    perror_exit(text)
-char   *text;
+void    perror_exit(char *text)
 {
     perror(text);
     exit(1);
@@ -144,8 +141,7 @@
 
 /* pipe_stdin - pipe stdin through program (from my ANSI to OLD C converter) */
 
-int     pipe_stdin(argv)
-char  **argv;
+int     pipe_stdin(char **argv)
 {
     int     pipefds[2];
     int     pid;
diff --git a/contrib/tcp_wrappers/scaffold.c b/contrib/tcp_wrappers/scaffold.c
--- a/contrib/tcp_wrappers/scaffold.c
+++ b/contrib/tcp_wrappers/scaffold.c
@@ -43,8 +43,7 @@
 #ifndef INET6
 /* dup_hostent - create hostent in one memory block */
 
-static struct hostent *dup_hostent(hp)
-struct hostent *hp;
+static struct hostent *dup_hostent(struct hostent *hp)
 {
     struct hostent_block {
 	struct hostent host;
@@ -80,8 +79,7 @@
 /* find_inet_addr - find all addresses for this host, result to free() */
 
 #ifdef INET6
-struct addrinfo *find_inet_addr(host)
-char   *host;
+struct addrinfo *find_inet_addr(char *host)
 {
     struct addrinfo hints, *res;
 
@@ -115,8 +113,7 @@
     return (res);
 }
 #else
-struct hostent *find_inet_addr(host)
-char   *host;
+struct hostent *find_inet_addr(char *host)
 {
     struct in_addr addr;
     struct hostent *hp;
@@ -161,8 +158,7 @@
 
 /* check_dns - give each address thorough workout, return address count */
 
-int     check_dns(host)
-char   *host;
+int     check_dns(char *host)
 {
     struct request_info request;
 #ifdef INET6
@@ -215,8 +211,7 @@
 
 /* ARGSUSED */
 
-void    shell_cmd(command)
-char   *command;
+void    shell_cmd(char *command)
 {
     if (hosts_access_verbose)
 	printf("command: %s", command);
@@ -226,17 +221,14 @@
 
 /* ARGSUSED */
 
-void    clean_exit(request)
-struct request_info *request;
+void    clean_exit(struct request_info *request)
 {
     exit(0);
 }
 
 /* check_path - examine accessibility */
 
-int     check_path(path, st)
-char   *path;
-struct stat *st;
+int     check_path(char *path, struct stat *st)
 {
     struct stat stbuf;
     char    buf[BUFSIZ];
diff --git a/contrib/tcp_wrappers/setenv.c b/contrib/tcp_wrappers/setenv.c
--- a/contrib/tcp_wrappers/setenv.c
+++ b/contrib/tcp_wrappers/setenv.c
@@ -16,10 +16,7 @@
 
 /* setenv - update or insert environment (name,value) pair */
 
-int     setenv(name, value, clobber)
-char   *name;
-char   *value;
-int     clobber;
+int     setenv(char *name, char *value, int clobber)
 {
     char   *malloc();
     char   *getenv();
diff --git a/contrib/tcp_wrappers/shell_cmd.c b/contrib/tcp_wrappers/shell_cmd.c
--- a/contrib/tcp_wrappers/shell_cmd.c
+++ b/contrib/tcp_wrappers/shell_cmd.c
@@ -36,8 +36,7 @@
 
 /* shell_cmd - execute shell command */
 
-void    shell_cmd(command)
-char   *command;
+void    shell_cmd(char *command)
 {
     int     child_pid;
     int     wait_pid;
diff --git a/contrib/tcp_wrappers/socket.c b/contrib/tcp_wrappers/socket.c
--- a/contrib/tcp_wrappers/socket.c
+++ b/contrib/tcp_wrappers/socket.c
@@ -52,8 +52,7 @@
   * that lack DNS-style trailing dot magic, such as local files or NIS maps.
   */
 
-static struct hostent *gethostbyname_dot(name)
-char   *name;
+static struct hostent *gethostbyname_dot(char *name)
 {
     char    dot_name[MAXHOSTNAMELEN + 1];
 
@@ -75,8 +74,7 @@
 
 /* sock_host - look up endpoint addresses and install conversion methods */
 
-void    sock_host(request)
-struct request_info *request;
+void    sock_host(struct request_info *request)
 {
 #ifdef INET6
     static struct sockaddr_storage client;
@@ -139,8 +137,7 @@
 
 /* sock_hostaddr - map endpoint address to printable form */
 
-void    sock_hostaddr(host)
-struct host_info *host;
+void    sock_hostaddr(struct host_info *host)
 {
 #ifdef INET6
     struct sockaddr *sin = host->sin;
@@ -166,8 +163,7 @@
 
 /* sock_hostname - map endpoint address to host name */
 
-void    sock_hostname(host)
-struct host_info *host;
+void    sock_hostname(struct host_info *host)
 {
 #ifdef INET6
     struct sockaddr *sin = host->sin;
diff --git a/contrib/tcp_wrappers/strcasecmp.c b/contrib/tcp_wrappers/strcasecmp.c
--- a/contrib/tcp_wrappers/strcasecmp.c
+++ b/contrib/tcp_wrappers/strcasecmp.c
@@ -66,8 +66,7 @@
 	'\370', '\371', '\372', '\373', '\374', '\375', '\376', '\377',
 };
 
-strcasecmp(s1, s2)
-	char *s1, *s2;
+strcasecmp(char *s1, char *s2)
 {
 	register u_char	*cm = charmap,
 			*us1 = (u_char *)s1,
@@ -79,9 +78,7 @@
 	return(cm[*us1] - cm[*--us2]);
 }
 
-strncasecmp(s1, s2, n)
-	char *s1, *s2;
-	register int n;
+strncasecmp(char *s1, char *s2, register int n)
 {
 	register u_char	*cm = charmap,
 			*us1 = (u_char *)s1,
diff --git a/contrib/tcp_wrappers/tcpd.c b/contrib/tcp_wrappers/tcpd.c
--- a/contrib/tcp_wrappers/tcpd.c
+++ b/contrib/tcp_wrappers/tcpd.c
@@ -44,9 +44,7 @@
 int     allow_severity = SEVERITY;	/* run-time adjustable */
 int     deny_severity = LOG_WARNING;	/* ditto */
 
-main(argc, argv)
-int     argc;
-char  **argv;
+main(int argc, char **argv)
 {
     struct request_info request;
     char    path[MAXPATHNAMELEN];
diff --git a/contrib/tcp_wrappers/tcpdchk.c b/contrib/tcp_wrappers/tcpdchk.c
--- a/contrib/tcp_wrappers/tcpdchk.c
+++ b/contrib/tcp_wrappers/tcpdchk.c
@@ -89,9 +89,7 @@
 static int allow_check;
 static char *inetcf;
 
-int     main(argc, argv)
-int     argc;
-char  **argv;
+int     main(int argc, char **argv)
 {
     struct request_info request;
     struct stat st;
@@ -192,9 +190,7 @@
 
 /* parse_table - like table_match(), but examines _all_ entries */
 
-static void parse_table(table, request)
-char   *table;
-struct request_info *request;
+static void parse_table(char *table, struct request_info *request)
 {
     FILE   *fp;
     int     real_verdict;
@@ -268,9 +264,7 @@
 
 /* print_list - pretty-print a list */
 
-static void print_list(title, list)
-char   *title;
-char   *list;
+static void print_list(char *title, char *list)
 {
     char    buf[BUFLEN];
     char   *cp;
@@ -290,8 +284,7 @@
 
 /* check_daemon_list - criticize daemon list */
 
-static void check_daemon_list(list)
-char   *list;
+static void check_daemon_list(char *list)
 {
     char    buf[BUFLEN];
     char   *cp;
@@ -318,8 +311,7 @@
 
 /* check_client_list - criticize client list */
 
-static void check_client_list(list)
-char   *list;
+static void check_client_list(char *list)
 {
     char    buf[BUFLEN];
     char   *cp;
@@ -347,8 +339,7 @@
 
 /* check_daemon - criticize daemon pattern */
 
-static void check_daemon(pat)
-char   *pat;
+static void check_daemon(char *pat)
 {
     if (pat[0] == '@') {
 	tcpd_warn("%s: daemon name begins with \"@\"", pat);
@@ -381,8 +372,7 @@
 
 /* check_user - criticize user pattern */
 
-static void check_user(pat)
-char   *pat;
+static void check_user(char *pat)
 {
     if (pat[0] == '@') {			/* @netgroup */
 	tcpd_warn("%s: user name begins with \"@\"", pat);
@@ -404,8 +394,7 @@
 }
 
 #ifdef INET6
-static int is_inet6_addr(pat)
-    char *pat;
+static int is_inet6_addr(char *pat)
 {
     struct addrinfo hints, *res;
     int len, ret;
@@ -430,8 +419,7 @@
 
 /* check_host - criticize host pattern */
 
-static int check_host(pat)
-char   *pat;
+static int check_host(char *pat)
 {
     char    buf[BUFSIZ];
     char   *mask;
@@ -515,8 +503,7 @@
 
 /* reserved_name - determine if name is reserved */
 
-static int reserved_name(pat)
-char   *pat;
+static int reserved_name(char *pat)
 {
     return (STR_EQ(pat, unknown)
 	    || STR_EQ(pat, "KNOWN")
diff --git a/contrib/tcp_wrappers/tcpdmatch.c b/contrib/tcp_wrappers/tcpdmatch.c
--- a/contrib/tcp_wrappers/tcpdmatch.c
+++ b/contrib/tcp_wrappers/tcpdmatch.c
@@ -53,9 +53,7 @@
 
 /* The main program */
 
-int     main(argc, argv)
-int     argc;
-char  **argv;
+int     main(int argc, char **argv)
 {
 #ifdef INET6
     struct addrinfo hints, *hp, *res;
@@ -316,8 +314,7 @@
 
 /* Explain how to use this program */
 
-static void usage(myname)
-char   *myname;
+static void usage(char *myname)
 {
     fprintf(stderr, "usage: %s [-d] [-i inet_conf] daemon[@host] [user@]host\n",
 	    myname);
@@ -328,10 +325,7 @@
 
 /* Print interesting expansions */
 
-static void expand(text, pattern, request)
-char   *text;
-char   *pattern;
-struct request_info *request;
+static void expand(char *text, char *pattern, struct request_info *request)
 {
     char    buf[BUFSIZ];
 
@@ -341,8 +335,7 @@
 
 /* Try out a (server,client) pair */
 
-static void tcpdmatch(request)
-struct request_info *request;
+static void tcpdmatch(struct request_info *request)
 {
     int     verdict;
 
diff --git a/contrib/tcp_wrappers/tli-sequent.c b/contrib/tcp_wrappers/tli-sequent.c
--- a/contrib/tcp_wrappers/tli-sequent.c
+++ b/contrib/tcp_wrappers/tli-sequent.c
@@ -48,8 +48,7 @@
 
 /* tli_host - determine endpoint info */
 
-int     tli_host(request)
-struct request_info *request;
+int     tli_host(struct request_info *request)
 {
     static struct sockaddr_in client;
     static struct sockaddr_in server;
@@ -144,7 +143,7 @@
 
 /* tli_error - convert tli error number to text */
 
-static char *tli_error()
+static char *tli_error(void)
 {
     static char buf[40];
 
@@ -167,8 +166,7 @@
 
 /* tli_sink - absorb unreceived datagram */
 
-static void tli_sink(fd)
-int     fd;
+static void tli_sink(int fd)
 {
     struct t_unitdata *unit;
     int     flags;
diff --git a/contrib/tcp_wrappers/tli.c b/contrib/tcp_wrappers/tli.c
--- a/contrib/tcp_wrappers/tli.c
+++ b/contrib/tcp_wrappers/tli.c
@@ -63,8 +63,7 @@
 
 /* tli_host - look up endpoint addresses and install conversion methods */
 
-void    tli_host(request)
-struct request_info *request;
+void    tli_host(struct request_info *request)
 {
 #ifdef INET6
     static struct sockaddr_storage client;
@@ -118,8 +117,7 @@
 
 /* tli_cleanup - cleanup some dynamically-allocated data structures */
 
-static void tli_cleanup(request)
-struct request_info *request;
+static void tli_cleanup(struct request_info *request)
 {
     if (request->config != 0)
 	freenetconfigent(request->config);
@@ -131,8 +129,7 @@
 
 /* tli_endpoints - determine TLI client and server endpoint information */
 
-static void tli_endpoints(request)
-struct request_info *request;
+static void tli_endpoints(struct request_info *request)
 {
     struct t_unitdata *server;
     struct t_unitdata *client;
@@ -240,8 +237,7 @@
 
 /* tli_hostaddr - map TLI transport address to printable address */
 
-static void tli_hostaddr(host)
-struct host_info *host;
+static void tli_hostaddr(struct host_info *host)
 {
     struct request_info *request = host->request;
     struct netconfig *config = request->config;
@@ -257,8 +253,7 @@
 
 /* tli_hostname - map TLI transport address to hostname */
 
-static void tli_hostname(host)
-struct host_info *host;
+static void tli_hostname(struct host_info *host)
 {
     struct request_info *request = host->request;
     struct netconfig *config = request->config;
@@ -346,8 +341,7 @@
 
 /* tli_sink - absorb unreceived datagram */
 
-static void tli_sink(fd)
-int     fd;
+static void tli_sink(int fd)
 {
     struct t_unitdata *unit;
     int     flags;
diff --git a/contrib/tcp_wrappers/try-from.c b/contrib/tcp_wrappers/try-from.c
--- a/contrib/tcp_wrappers/try-from.c
+++ b/contrib/tcp_wrappers/try-from.c
@@ -37,9 +37,7 @@
 int     allow_severity = SEVERITY;	/* run-time adjustable */
 int     deny_severity = LOG_WARNING;	/* ditto */
 
-main(argc, argv)
-int     argc;
-char  **argv;
+main(int argc, char **argv)
 {
     struct request_info request;
     char    buf[BUFSIZ];
diff --git a/contrib/tcp_wrappers/update.c b/contrib/tcp_wrappers/update.c
--- a/contrib/tcp_wrappers/update.c
+++ b/contrib/tcp_wrappers/update.c
@@ -33,9 +33,8 @@
 
 /* request_fill - request update engine */
 
-static struct request_info *request_fill(request, ap)
-struct request_info *request;
-va_list ap;
+static struct request_info *request_fill(struct request_info *request,
+    va_list ap)
 {
     int     key;
     char   *ptr;
diff --git a/contrib/tcp_wrappers/vfprintf.c b/contrib/tcp_wrappers/vfprintf.c
--- a/contrib/tcp_wrappers/vfprintf.c
+++ b/contrib/tcp_wrappers/vfprintf.c
@@ -20,10 +20,7 @@
 
 /* vfprintf - print variable-length argument list to stream */
 
-int     vfprintf(fp, format, ap)
-FILE   *fp;
-char   *format;
-va_list ap;
+int     vfprintf(FILE *fp, char *format, va_list ap)
 {
     char    fmt[BUFSIZ];		/* format specifier */
     register char *fmtp;
@@ -117,9 +114,7 @@
 
 /* vprintf - print variable-length argument list to stdout */
 
-vprintf(format, ap)
-char   *format;
-va_list ap;
+vprintf(char *format, va_list ap)
 {
     return (vfprintf(stdout, format, ap));
 }
diff --git a/contrib/tcp_wrappers/workarounds.c b/contrib/tcp_wrappers/workarounds.c
--- a/contrib/tcp_wrappers/workarounds.c
+++ b/contrib/tcp_wrappers/workarounds.c
@@ -59,8 +59,7 @@
 
 #undef inet_addr
 
-long    fix_inet_addr(string)
-char   *string;
+long    fix_inet_addr(char *string)
 {
     return (inet_addr(string).s_addr);
 }
@@ -80,10 +79,7 @@
 
 #undef fgets
 
-char   *fix_fgets(buf, len, fp)
-char   *buf;
-int     len;
-FILE   *fp;
+char   *fix_fgets(char *buf, int len, FILE *fp)
 {
     char   *cp = buf;
     int     c;
@@ -123,13 +119,8 @@
 
 #undef recvfrom
 
-int     fix_recvfrom(sock, buf, buflen, flags, from, fromlen)
-int     sock;
-char   *buf;
-int     buflen;
-int     flags;
-struct sockaddr *from;
-int    *fromlen;
+int     fix_recvfrom(int sock, char *buf, int buflen, int flags,
+    struct sockaddr *from, int *fromlen)
 {
     int     ret;
 
@@ -163,10 +154,7 @@
 
 #undef getpeername
 
-int     fix_getpeername(sock, sa, len)
-int     sock;
-struct sockaddr *sa;
-int    *len;
+int     fix_getpeername(int sock, struct sockaddr *sa, int *len)
 {
     int     ret;
 #ifdef INET6
@@ -202,8 +190,7 @@
 
 #ifdef USE_GETDOMAIN
 
-int     yp_get_default_domain(ptr)
-char  **ptr;
+int     yp_get_default_domain(char **ptr)
 {
     static char mydomain[MAXHOSTNAMELEN];
 
@@ -231,8 +218,7 @@
 
 #undef gethostbyname
 
-struct hostent *fix_gethostbyname(name)
-char   *name;
+struct hostent *fix_gethostbyname(char *name)
 {
     struct hostent *hp;
     struct in_addr addr;
@@ -269,9 +255,7 @@
 
 #ifdef USE_STRSEP
 
-char   *fix_strtok(buf, sep)
-char   *buf;
-char   *sep;
+char   *fix_strtok(char *buf, char *sep)
 {
     static char *state;
     char   *result;
@@ -294,9 +278,7 @@
 
 #ifdef LIBC_CALLS_STRTOK
 
-char   *my_strtok(buf, sep)
-char   *buf;
-char   *sep;
+char   *my_strtok(char *buf, char *sep)
 {
     static char *state;
     char   *result;