diff --git a/appl/ftp/common/glob.c b/appl/ftp/common/glob.c
index ad28fe701..76317c725 100644
--- a/appl/ftp/common/glob.c
+++ b/appl/ftp/common/glob.c
@@ -648,7 +648,7 @@ globextend(const Char *path, glob_t *pglob)
 
 	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 	pathv = pglob->gl_pathv ? 
-		    realloc((char *)pglob->gl_pathv, newsize) :
+		    realloc(pglob->gl_pathv, newsize) :
 		    malloc(newsize);
 	if (pathv == NULL)
 		return(GLOB_NOSPACE);
diff --git a/appl/ftp/ftp/ftp.c b/appl/ftp/ftp/ftp.c
index 5eb747d82..dc68d2e8e 100644
--- a/appl/ftp/ftp/ftp.c
+++ b/appl/ftp/ftp/ftp.c
@@ -70,7 +70,7 @@ hookup(char *host, int port)
 		if (hp == NULL) {
 			warnx("%s: %s", host, hstrerror(h_errno));
 			code = -1;
-			return ((char *) 0);
+			return NULL;
 		}
 		hisctladdr.sin_family = hp->h_addrtype;
 		memmove(&hisctladdr.sin_addr,
@@ -159,7 +159,7 @@ hookup(char *host, int port)
 	return (hostname);
 bad:
 	close(s);
-	return ((char *)0);
+	return NULL;
 }
 
 int
@@ -1577,7 +1577,7 @@ gunique(char *local)
 		*cp = '/';
 	if (d < 0) {
 		warn("local: %s", local);
-		return ((char *) 0);
+		return NULL;
 	}
 	strcpy(new, local);
 	cp = new + strlen(new);
diff --git a/appl/ftp/ftp/main.c b/appl/ftp/ftp/main.c
index 770156e68..11a197978 100644
--- a/appl/ftp/ftp/main.c
+++ b/appl/ftp/ftp/main.c
@@ -428,7 +428,7 @@ OUT:
 		default:
 			break;
 	}
-	return ((char *)0);
+	return NULL;
 }
 
 #define HELPINDENT ((int) sizeof ("directory"))
diff --git a/appl/ftp/ftpd/ftpd.c b/appl/ftp/ftpd/ftpd.c
index ca4cb611c..d50b6ef88 100644
--- a/appl/ftp/ftpd/ftpd.c
+++ b/appl/ftp/ftpd/ftpd.c
@@ -1599,7 +1599,7 @@ renamefrom(char *name)
 
 	if (stat(name, &st) < 0) {
 		perror_reply(550, name);
-		return ((char *)0);
+		return NULL;
 	}
 	reply(350, "File exists, ready for destination name");
 	return (name);
@@ -1763,7 +1763,7 @@ gunique(char *local)
 		*cp = '\0';
 	if (stat(cp ? local : ".", &st) < 0) {
 		perror_reply(553, cp ? local : ".");
-		return ((char *) 0);
+		return NULL;
 	}
 	if (cp)
 		*cp = '/';
diff --git a/appl/kx/writeauth.c b/appl/kx/writeauth.c
index 010b5bc70..3c9d829b0 100644
--- a/appl/kx/writeauth.c
+++ b/appl/kx/writeauth.c
@@ -43,7 +43,7 @@ FILE		*file;
 
     file_short[0] = (s & (unsigned)0xff00) >> 8;
     file_short[1] = s & 0xff;
-    if (fwrite ((char *) file_short, (int) sizeof (file_short), 1, file) != 1)
+    if (fwrite (file_short, sizeof (file_short), 1, file) != 1)
 	return 0;
     return 1;
 }
diff --git a/appl/login/utmp_login.c b/appl/login/utmp_login.c
index 6fa78b3df..2ae63b169 100644
--- a/appl/login/utmp_login.c
+++ b/appl/login/utmp_login.c
@@ -111,7 +111,7 @@ void utmp_login(char *tty, char *username, char *hostname)
       ttyno = ttyslot();
       if (ttyno > 0 && (fd = open(_PATH_UTMP, O_WRONLY, 0)) >= 0) {
 	lseek(fd, (long)(ttyno * sizeof(struct utmp)), SEEK_SET);
-	write(fd, (char *)&utmp, sizeof(struct utmp));
+	write(fd, &utmp, sizeof(struct utmp));
 	close(fd);
       }
     }
@@ -119,7 +119,7 @@ void utmp_login(char *tty, char *username, char *hostname)
 #endif /* HAVE_SETUTENT */
 
     if ((fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) >= 0) {
-	write(fd, (char *)&utmp, sizeof(struct utmp));
+	write(fd, &utmp, sizeof(struct utmp));
 	close(fd);
     }
 }
diff --git a/appl/popper/pop_init.c b/appl/popper/pop_init.c
index 43b5899f5..431e10ef0 100644
--- a/appl/popper/pop_init.c
+++ b/appl/popper/pop_init.c
@@ -162,7 +162,7 @@ pop_init(POP *p,int argcount,char **argmessage)
     p->ipport = ntohs(cs.sin_port);
 
     /*  Get the canonical name of the host to whom I am speaking */
-    ch = gethostbyaddr(&cs.sin_addr, sizeof(cs.sin_addr), AF_INET);
+    ch = gethostbyaddr((char *)&cs.sin_addr, sizeof(cs.sin_addr), AF_INET);
     if (ch == NULL){
         pop_log(p,POP_PRIORITY,
             "Unable to get canonical name of client, err = %d",errno);
diff --git a/appl/popper/pop_quit.c b/appl/popper/pop_quit.c
index 419d854c6..29ed657f2 100644
--- a/appl/popper/pop_quit.c
+++ b/appl/popper/pop_quit.c
@@ -15,7 +15,7 @@ int
 pop_quit (POP *p)
 {
     /*  Release the message information list */
-    if (p->mlp) free ((char *)p->mlp);
+    if (p->mlp) free (p->mlp);
 
     return(POP_SUCCESS);
 }
diff --git a/appl/telnet/libtelnet/auth.c b/appl/telnet/libtelnet/auth.c
index 1ee286f03..91935d45b 100644
--- a/appl/telnet/libtelnet/auth.c
+++ b/appl/telnet/libtelnet/auth.c
@@ -414,7 +414,7 @@ auth_send(unsigned char *data, int cnt)
 	auth_send_cnt = cnt > sizeof(_auth_send_data)
 	    ? sizeof(_auth_send_data)
 	    : cnt;
-	memmove((void *)_auth_send_data, (void *)data, auth_send_cnt);
+	memmove(_auth_send_data, data, auth_send_cnt);
 	auth_send_data = _auth_send_data;
     } else {
 	/*
@@ -533,7 +533,7 @@ auth_name(unsigned char *data, int cnt)
 		   Name, cnt, sizeof(savename)-1);
 	return;
     }
-    memmove((void *)savename, (void *)data, cnt);
+    memmove(savename, data, cnt);
     savename[cnt] = '\0';	/* Null terminate */
     if (auth_debug_mode)
 	printf(">>>%s: Got NAME [%s]\r\n", Name, savename);
diff --git a/appl/telnet/libtelnet/enc_des.c b/appl/telnet/libtelnet/enc_des.c
index 4ce59ceac..8b2bf6ff8 100644
--- a/appl/telnet/libtelnet/enc_des.c
+++ b/appl/telnet/libtelnet/enc_des.c
@@ -143,7 +143,7 @@ void ofb64_init(int server)
 
 void fb64_init(struct fb *fbp)
 {
-	memset((void *)fbp,0, sizeof(*fbp));
+	memset(fbp,0, sizeof(*fbp));
 	fbp->state[0] = fbp->state[1] = FAILED;
 	fbp->fb_feed[0] = IAC;
 	fbp->fb_feed[1] = SB;
@@ -283,7 +283,7 @@ int fb64_is(unsigned char *data, int cnt, struct fb *fbp)
 		if (encrypt_debug_mode)
 			printf("Initializing Decrypt stream\r\n");
 
-		fb64_stream_iv((void *)data, &fbp->streams[DIR_DECRYPT-1]);
+		fb64_stream_iv(data, &fbp->streams[DIR_DECRYPT-1]);
 
 		p = fbp->fb_feed + 3;
 		*p++ = ENCRYPT_REPLY;
@@ -397,7 +397,7 @@ static void fb64_session(Session_Key *key, int server, struct fb *fbp)
 				key ? key->type : -1, SK_DES);
 		return;
 	}
-	memcpy((void *)fbp->krbdes_key, (void *)key->data, sizeof(des_cblock));
+	memcpy(fbp->krbdes_key, key->data, sizeof(des_cblock));
 
 	fb64_stream_key(fbp->krbdes_key, &fbp->streams[DIR_ENCRYPT-1]);
 	fb64_stream_key(fbp->krbdes_key, &fbp->streams[DIR_DECRYPT-1]);
@@ -508,8 +508,8 @@ void ofb64_printsub(unsigned char *data, int cnt,
 void fb64_stream_iv(des_cblock seed, struct stinfo *stp)
 {
 
-	memcpy((void *)stp->str_iv, (void *)seed,sizeof(des_cblock));
-	memcpy((void *)stp->str_output, (void *)seed, sizeof(des_cblock));
+	memcpy(stp->str_iv, seed,sizeof(des_cblock));
+	memcpy(stp->str_output, seed, sizeof(des_cblock));
 
 	des_key_sched(&stp->str_ikey, stp->str_sched);
 
@@ -518,10 +518,10 @@ void fb64_stream_iv(des_cblock seed, struct stinfo *stp)
 
 void fb64_stream_key(des_cblock key, struct stinfo *stp)
 {
-	memcpy((void *)stp->str_ikey, (void *)key, sizeof(des_cblock));
+	memcpy(stp->str_ikey, key, sizeof(des_cblock));
 	des_key_sched((des_cblock*)key, stp->str_sched);
 
-	memcpy((void *)stp->str_output, (void *)stp->str_iv, sizeof(des_cblock));
+	memcpy(stp->str_output, stp->str_iv, sizeof(des_cblock));
 
 	stp->str_index = sizeof(des_cblock);
 }
@@ -558,7 +558,7 @@ void cfb64_encrypt(unsigned char *s, int c)
 		if (index == sizeof(des_cblock)) {
 			des_cblock b;
 			des_ecb_encrypt(&stp->str_output, &b,stp->str_sched, 1);
-			memcpy((void *)stp->str_feed, (void *)b, sizeof(des_cblock));
+			memcpy(stp->str_feed, b, sizeof(des_cblock));
 			index = 0;
 		}
 
@@ -590,7 +590,7 @@ int cfb64_decrypt(int data)
 	if (index == sizeof(des_cblock)) {
 		des_cblock b;
 		des_ecb_encrypt(&stp->str_output,&b, stp->str_sched, 1);
-		memcpy((void *)stp->str_feed, (void *)b, sizeof(des_cblock));
+		memcpy(stp->str_feed, b, sizeof(des_cblock));
 		stp->str_index = 1;	/* Next time will be 1 */
 		index = 0;		/* But now use 0 */ 
 	}
@@ -630,7 +630,7 @@ void ofb64_encrypt(unsigned char *s, int c)
 		if (index == sizeof(des_cblock)) {
 			des_cblock b;
 			des_ecb_encrypt(&stp->str_feed,&b, stp->str_sched, 1);
-			memcpy((void *)stp->str_feed, (void *)b, sizeof(des_cblock));
+			memcpy(stp->str_feed, b, sizeof(des_cblock));
 			index = 0;
 		}
 		*s++ ^= stp->str_feed[index];
@@ -659,7 +659,7 @@ int ofb64_decrypt(int data)
 	if (index == sizeof(des_cblock)) {
 		des_cblock b;
 		des_ecb_encrypt(&stp->str_feed,&b,stp->str_sched, 1);
-		memcpy((void *)stp->str_feed, (void *)b, sizeof(des_cblock));
+		memcpy(stp->str_feed, b, sizeof(des_cblock));
 		stp->str_index = 1;	/* Next time will be 1 */
 		index = 0;		/* But now use 0 */ 
 	}
diff --git a/appl/telnet/libtelnet/forward.c b/appl/telnet/libtelnet/forward.c
index 3c3eb2379..14d553438 100644
--- a/appl/telnet/libtelnet/forward.c
+++ b/appl/telnet/libtelnet/forward.c
@@ -124,8 +124,8 @@ get_for_creds(etype, sumtype, rhost, client, enc_key, forwardable, outbuf)
 		return ENOMEM;
 	    }
 	    else
-	      memmove ((char *)addrs[i]->contents, hp->h_addr_list[i],
-		      addrs[i]->length);
+	      memmove (addrs[i]->contents, hp->h_addr_list[i],
+		       addrs[i]->length);
 	}
 	else {
 	    return ENOMEM;
@@ -133,7 +133,7 @@ get_for_creds(etype, sumtype, rhost, client, enc_key, forwardable, outbuf)
     }
     addrs[i] = 0;
 
-    memset((char *)&creds, 0, sizeof(creds));
+    memset(&creds, 0, sizeof(creds));
     if (retval = krb5_copy_principal(client, &creds.client))
       return retval;
 
@@ -220,7 +220,7 @@ get_for_creds(etype, sumtype, rhost, client, enc_key, forwardable, outbuf)
 	return retval;
 #undef cleanup
 #define cleanup() {\
-	memset((char *)dec_rep->enc_part2->session->contents, 0,\
+	memset(dec_rep->enc_part2->session->contents, 0,\
 	      dec_rep->enc_part2->session->length);\
 		  krb5_free_kdc_rep(dec_rep); }
 
@@ -490,7 +490,7 @@ const krb5_address *recv_addr;	  /* optional */
 	krb5_xfree(creds->ticket.data);
 	return ENOMEM;
     }
-    memmove((char *)creds->ticket.data, (char *) scratch->data, scratch->length);
+    memmove(creds->ticket.data, scratch->data, scratch->length);
 
     cleanup_scratch();
 
@@ -603,7 +603,7 @@ const krb5_address *recv_addr;	  /* optional */
 
 #undef clean
 #define clean() {\
-	memset((char *)creds->keyblock.contents, 0, creds->keyblock.length);}
+	memset(creds->keyblock.contents, 0, creds->keyblock.length);}
 
     creds->times = credmsg_enc_part->ticket_info[0]->times;
     creds->is_skey = FALSE;
diff --git a/appl/telnet/libtelnet/kerberos.c b/appl/telnet/libtelnet/kerberos.c
index 77b4b8687..17ae3ad19 100644
--- a/appl/telnet/libtelnet/kerberos.c
+++ b/appl/telnet/libtelnet/kerberos.c
@@ -275,7 +275,7 @@ kerberos4_is(Authenticator *ap, unsigned char *data, int cnt)
 		printf("No local realm\r\n");
 	    return;
 	}
-	memmove((void *)auth.dat, (void *)data, auth.length = cnt);
+	memmove(auth.dat, data, auth.length = cnt);
 	if (auth_debug_mode) {
 	    printf("Got %d bytes of authentication data\r\n", cnt);
 	    printf("CK: %d:", kerberos4_cksum(auth.dat, auth.length));
@@ -296,14 +296,14 @@ kerberos4_is(Authenticator *ap, unsigned char *data, int cnt)
 	krb_kntoln(&adat, name);
 
 	if (UserNameRequested && !kuserok(&adat, UserNameRequested))
-	    Data(ap, KRB_ACCEPT, (void *)0, 0);
+	    Data(ap, KRB_ACCEPT, NULL, 0);
 	else {
 	    char *msg = malloc(ANAME_SZ + 1 + INST_SZ +
 			       REALM_SZ +
 			       strlen(UserNameRequested) + 80);
 	    
 	    if (msg == NULL)
-		Data(ap, KRB_REJECT, (void *)0, 0);
+		Data(ap, KRB_REJECT, NULL, 0);
 	    sprintf (msg, "user `%s' is not authorized to "
 		     "login as `%s'", 
 		     krb_unparse_name_long(adat.pname, 
@@ -319,7 +319,7 @@ kerberos4_is(Authenticator *ap, unsigned char *data, int cnt)
 	
     case KRB_CHALLENGE:
 #ifndef ENCRYPTION
-	Data(ap, KRB_RESPONSE, (void *)0, 0);
+	Data(ap, KRB_RESPONSE, NULL, 0);
 #else
 	if(!VALIDKEY(session_key)){
 	    Data(ap, KRB_RESPONSE, NULL, 0);
diff --git a/appl/telnet/libtelnet/kerberos5.c b/appl/telnet/libtelnet/kerberos5.c
index 9a0ce35c7..cdcff3240 100644
--- a/appl/telnet/libtelnet/kerberos5.c
+++ b/appl/telnet/libtelnet/kerberos5.c
@@ -139,7 +139,7 @@ Data(ap, type, d, c)
 	unsigned char *cd = (unsigned char *)d;
 
 	if (c == -1)
-		c = strlen((char *)cd);
+		c = strlen(cd);
 
 	if (auth_debug_mode) {
 		printf("%s:%d: [%d] (%d)",
@@ -249,7 +249,7 @@ kerberos5_send(ap)
 	}
 
 
-	memset((char *)&creds, 0, sizeof(creds));
+	memset(&creds, 0, sizeof(creds));
 	creds.server = server;
 
 	if (r = krb5_cc_get_principal(ccache, &creds.client)) {
diff --git a/appl/telnet/libtelnet/krb4encpwd.c b/appl/telnet/libtelnet/krb4encpwd.c
index 0ffb3fc71..da2f9a700 100644
--- a/appl/telnet/libtelnet/krb4encpwd.c
+++ b/appl/telnet/libtelnet/krb4encpwd.c
@@ -128,7 +128,7 @@ Data(ap, type, d, c)
 	unsigned char *cd = (unsigned char *)d;
 
 	if (c == -1)
-		c = strlen((char *)cd);
+		c = strlen(cd);
 
 	if (0) {
 		printf("%s:%d: [%d] (%d)",
@@ -189,7 +189,7 @@ krb4encpwd_send(ap)
 		return(0);
 	}
 
-	if (!Data(ap, KRB4_ENCPWD_ACK, (void *)NULL, 0)) {
+	if (!Data(ap, KRB4_ENCPWD_ACK, NULL, 0)) {
 		return(0);
 	}
 
@@ -213,13 +213,13 @@ krb4encpwd_is(ap, data, cnt)
 		return;
 	switch (*data++) {
 	case KRB4_ENCPWD_AUTH:
-		memmove((void *)auth.dat, (void *)data, auth.length = cnt);
+		memmove(auth.dat, data, auth.length = cnt);
 
 		k_gethostname(lhostname, sizeof(lhostname));
 		if ((cp = strchr(lhostname, '.')) != 0)  *cp = '\0';
 
 		if (r = krb_rd_encpwd_req(&auth, KRB_SERVICE_NAME, lhostname, 0, &adat, NULL, challenge, r_user, r_passwd)) {
-			Data(ap, KRB4_ENCPWD_REJECT, (void *)"Auth failed", -1);
+			Data(ap, KRB4_ENCPWD_REJECT, "Auth failed", -1);
 			auth_finished(ap, AUTH_REJECT);
 			return;
 		}
@@ -228,13 +228,13 @@ krb4encpwd_is(ap, data, cnt)
 		  /*
 		   *  illegal username and password
 		   */
-		  Data(ap, KRB4_ENCPWD_REJECT, (void *)"Illegal password", -1);
+		  Data(ap, KRB4_ENCPWD_REJECT, "Illegal password", -1);
 		  auth_finished(ap, AUTH_REJECT);
 		  return;
 		}
 
-		memmove((void *)session_key, (void *)adat.session, sizeof(des_cblock));
-		Data(ap, KRB4_ENCPWD_ACCEPT, (void *)0, 0);
+		memmove(session_key, adat.session, sizeof(des_cblock));
+		Data(ap, KRB4_ENCPWD_ACCEPT, 0, 0);
 		auth_finished(ap, AUTH_USER);
 		break;
 
@@ -243,7 +243,7 @@ krb4encpwd_is(ap, data, cnt)
 		 *  Take the received random challenge text and save
 		 *  for future authentication.
 		 */
-		memmove((void *)challenge, (void *)data, sizeof(des_cblock));
+		memmove(challenge, data, sizeof(des_cblock));
 		break;
 
 
@@ -262,7 +262,7 @@ krb4encpwd_is(ap, data, cnt)
 
 		  time(&now);
 		  sprintf(challenge, "%x", now);
-		  Data(ap, KRB4_ENCPWD_CHALLENGE, (void *)challenge, strlen(challenge));
+		  Data(ap, KRB4_ENCPWD_CHALLENGE, challenge, strlen(challenge));
 		}
 		break;
 
@@ -309,7 +309,7 @@ krb4encpwd_reply(ap, data, cnt)
 
 		k_gethostname(hostname, sizeof(hostname));
 		realm = krb_realmofhost(hostname);
-		memmove((void *)challenge, (void *)data, cnt);
+		memmove(challenge, data, cnt);
 		memset(user_passwd, 0, sizeof(user_passwd));
 		local_des_read_pw_string(user_passwd, sizeof(user_passwd)-1, "Password: ", 0);
 		UserPassword = user_passwd;
@@ -321,7 +321,7 @@ krb4encpwd_reply(ap, data, cnt)
 		  krb_token.length = 0;
 		}
 
-		if (!Data(ap, KRB4_ENCPWD_AUTH, (void *)krb_token.dat, krb_token.length)) {
+		if (!Data(ap, KRB4_ENCPWD_AUTH, krb_token.dat, krb_token.length)) {
 		  return;
 		}
 
diff --git a/appl/telnet/libtelnet/read_password.c b/appl/telnet/libtelnet/read_password.c
index 5ca879207..ce96d2a2f 100644
--- a/appl/telnet/libtelnet/read_password.c
+++ b/appl/telnet/libtelnet/read_password.c
@@ -87,7 +87,7 @@ local_des_read_pw_string(s,max,prompt,verify)
     }
 
     /* XXX assume jmp_buf is typedef'ed to an array */
-    memmove((char *)env, (char *)old_env, sizeof(env));
+    memmove(env, old_env, sizeof(env));
     if (setjmp(env))
 	goto lose;
 
@@ -137,7 +137,7 @@ lose:
 /*
     pop_signals();
 */
-    memmove((char *)old_env, (char *)env, sizeof(env));
+    memmove(old_env, env, sizeof(env));
     if (verify)
 	memset(key_string, 0, sizeof (key_string));
     s[max-1] = 0;		/* force termination */
diff --git a/appl/telnet/libtelnet/rsaencpwd.c b/appl/telnet/libtelnet/rsaencpwd.c
index 28689eb3f..1b1e573f2 100644
--- a/appl/telnet/libtelnet/rsaencpwd.c
+++ b/appl/telnet/libtelnet/rsaencpwd.c
@@ -186,7 +186,7 @@ rsaencpwd_send(ap)
 	if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
 		return(0);
 	}
-	if (!Data(ap, NULL, (void *)NULL, 0)) {
+	if (!Data(ap, NULL, NULL, 0)) {
 		return(0);
 	}
 
@@ -212,10 +212,10 @@ rsaencpwd_is(ap, data, cnt)
 	cnt--;
 	switch (*data++) {
 	case RSA_ENCPWD_AUTH:
-		memmove((void *)auth.dat, (void *)data, auth.length = cnt);
+		memmove(auth.dat, data, auth.length = cnt);
 
 		if ((fp=fopen(key_file, "r"))==NULL) {
-		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
+		  Data(ap, RSA_ENCPWD_REJECT, "Auth failed", -1);
 		  auth_finished(ap, AUTH_REJECT);
 		  return;
 		}
@@ -231,7 +231,7 @@ rsaencpwd_is(ap, data, cnt)
 		r = accept_rsa_encpwd(&auth, key, challenge,
 				      challenge_len, r_passwd);
 		if (r < 0) {
-		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
+		  Data(ap, RSA_ENCPWD_REJECT, "Auth failed", -1);
 		  auth_finished(ap, AUTH_REJECT);
 		  return;
 		}
@@ -240,12 +240,12 @@ rsaencpwd_is(ap, data, cnt)
 		  /*
 		   *  illegal username and password
 		   */
-		  Data(ap, RSA_ENCPWD_REJECT, (void *)"Illegal password", -1);
+		  Data(ap, RSA_ENCPWD_REJECT, "Illegal password", -1);
 		  auth_finished(ap, AUTH_REJECT);
 		  return;
 		}
 
-		Data(ap, RSA_ENCPWD_ACCEPT, (void *)0, 0);
+		Data(ap, RSA_ENCPWD_ACCEPT, 0, 0);
 		auth_finished(ap, AUTH_USER);
 		break;
 
@@ -270,7 +270,7 @@ rsaencpwd_is(ap, data, cnt)
 		  }
 
 		  if ((fp=fopen(key_file, "r"))==NULL) {
-		    Data(ap, RSA_ENCPWD_REJECT, (void *)"Auth failed", -1);
+		    Data(ap, RSA_ENCPWD_REJECT, "Auth failed", -1);
 		    auth_finished(ap, AUTH_REJECT);
 		    return;
 		  }
@@ -303,7 +303,7 @@ rsaencpwd_is(ap, data, cnt)
 		  ptr += NumEncodeLengthOctets(i);
 		  memmove(ptr, key, i);
 		  chalkey_len = 1+NumEncodeLengthOctets(chalkey_len)+chalkey_len;
-		  Data(ap, RSA_ENCPWD_CHALLENGEKEY, (void *)chalkey, chalkey_len);
+		  Data(ap, RSA_ENCPWD_CHALLENGEKEY, chalkey, chalkey_len);
 		}
 		break;
 
@@ -347,7 +347,7 @@ rsaencpwd_reply(ap, data, cnt)
 		 * Verify that the response to the challenge is correct.
 		 */
 
-		memmove((void *)chalkey, (void *)data, cnt);
+		memmove(chalkey, data, cnt);
 		ptr = (char *) &chalkey[0];
 		ptr += DecodeHeaderLength(chalkey);
 		if (*ptr != 0x04) {
@@ -374,7 +374,7 @@ rsaencpwd_reply(ap, data, cnt)
 		  token.length = 1;
 		}
 
-		if (!Data(ap, RSA_ENCPWD_AUTH, (void *)token.dat, token.length)) {
+		if (!Data(ap, RSA_ENCPWD_AUTH, token.dat, token.length)) {
 		  return;
 		}
 
diff --git a/appl/telnet/libtelnet/spx.c b/appl/telnet/libtelnet/spx.c
index 00f8795c1..896edc62f 100644
--- a/appl/telnet/libtelnet/spx.c
+++ b/appl/telnet/libtelnet/spx.c
@@ -299,7 +299,7 @@ spx_send(ap)
 		return(0);
 	}
 
-	if (!Data(ap, SPX_AUTH, (void *)output_token.value, output_token.length)) {
+	if (!Data(ap, SPX_AUTH, output_token.value, output_token.length)) {
 		return(0);
 	}
 
@@ -387,7 +387,7 @@ spx_is(ap, data, cnt)
 					src_name,
 					&fullname_buffer,
 					&fullname_type);
-			Data(ap, SPX_REJECT, (void *)"auth failed", -1);
+			Data(ap, SPX_REJECT, "auth failed", -1);
 			auth_finished(ap, AUTH_REJECT);
 			return;
 		}
@@ -398,7 +398,7 @@ spx_is(ap, data, cnt)
 					&fullname_type);
 
 
-		Data(ap, SPX_ACCEPT, (void *)output_token.value, output_token.length);
+		Data(ap, SPX_ACCEPT, output_token.value, output_token.length);
 		auth_finished(ap, AUTH_USER);
 		break;
 
diff --git a/appl/telnet/telnet/commands.c b/appl/telnet/telnet/commands.c
index 4636d02dc..1cf698d15 100644
--- a/appl/telnet/telnet/commands.c
+++ b/appl/telnet/telnet/commands.c
@@ -2172,7 +2172,7 @@ int tn(int argc, char **argv)
     char *cmd, *hostp = 0, *portp = 0, *user = 0;
 
     /* clear the socket address prior to use */
-    memset((char *)&sin, 0, sizeof(sin));
+    memset(&sin, 0, sizeof(sin));
 
     if (connected) {
 	printf("?Already connected to %s\n", hostname);
@@ -2350,7 +2350,7 @@ int tn(int argc, char **argv)
 		fprintf(stderr, "telnet: connect to address %s: ",
 						inet_ntoa(sin.sin_addr));
 		errno = oerrno;
-		perror((char *)0);
+		perror(NULL);
 		host->h_addr_list++;
 		memmove(&sin.sin_addr,
 			host->h_addr_list[0],
@@ -2731,7 +2731,7 @@ sourceroute(arg, cpp, lenp)
 			*cpp = cp;
 			return(0);
 		}
-		memmove(lsrp, (char *)&sin_addr, 4);
+		memmove(lsrp, &sin_addr, 4);
 		lsrp += 4;
 		if (cp2)
 			cp = cp2;
diff --git a/appl/telnet/telnet/ring.c b/appl/telnet/telnet/ring.c
index ead32652b..365c31cf1 100644
--- a/appl/telnet/telnet/ring.c
+++ b/appl/telnet/telnet/ring.c
@@ -104,7 +104,7 @@ static u_long ring_clock = 0;
 
 int ring_init(Ring *ring, unsigned char *buffer, int count)
 {
-    memset((char *)ring, 0, sizeof *ring);
+    memset(ring, 0, sizeof *ring);
 
     ring->size = count;
 
diff --git a/appl/telnet/telnetd/authenc.c b/appl/telnet/telnetd/authenc.c
index 9ff46169f..78beda515 100644
--- a/appl/telnet/telnetd/authenc.c
+++ b/appl/telnet/telnetd/authenc.c
@@ -46,7 +46,7 @@ RCSID("$Id$");
 net_write(unsigned char *str, int len)
 {
 	if (nfrontp + len < netobuf + BUFSIZ) {
-		memmove((void *)nfrontp, (void *)str, len);
+		memmove(nfrontp, str, len);
 		nfrontp += len;
 		return(len);
 	}
@@ -82,6 +82,6 @@ telnet_getenv(char *val)
 	char *
 telnet_gets(char *prompt, char *result, int length, int echo)
 {
-	return((char *)0);
+	return NULL;
 }
 #endif
diff --git a/appl/telnet/telnetd/sys_term.c b/appl/telnet/telnetd/sys_term.c
index 711709c3b..cb0ad4baa 100644
--- a/appl/telnet/telnetd/sys_term.c
+++ b/appl/telnet/telnetd/sys_term.c
@@ -188,7 +188,7 @@ copy_termbuf(cp, len)
 {
 	if (len > sizeof(termbuf))
 		len = sizeof(termbuf);
-	memmove((char *)&termbuf, cp, len);
+	memmove(&termbuf, cp, len);
 	termbuf2 = termbuf;
 }
 #endif	/* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
@@ -199,7 +199,7 @@ set_termbuf(void)
 	/*
 	 * Only make the necessary changes.
 	 */
-	if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
+	if (memcmp(&termbuf, &termbuf2, sizeof(termbuf)))
 # ifdef  STREAMSPTY
 		if (really_stream)
 			tcsetattr(ttyfd, TCSANOW, &termbuf);
@@ -1020,7 +1020,7 @@ void getptyslave(void)
 	init_termbuf();
 # ifdef	TIOCGWINSZ
 	if (def_row || def_col) {
-		memset((char *)&ws, 0, sizeof(ws));
+		memset(&ws, 0, sizeof(ws));
 		ws.ws_col = def_col;
 		ws.ws_row = def_row;
 		ioctl(t, TIOCSWINSZ, (char *)&ws);
@@ -1276,7 +1276,7 @@ startslave(char *host, int autologin, char *autoname)
 		pututline(&wtmp);
 		endutent();
 		if ((i = open(wtmpf, O_WRONLY|O_APPEND)) >= 0) {
-			write(i, (char *)&wtmp, sizeof(struct utmp));
+			write(i, &wtmp, sizeof(struct utmp));
 			close(i);
 		}
 #ifdef	CRAY
@@ -1666,7 +1666,7 @@ rmut(void)
 		if (!utmp)
 			syslog(LOG_ERR, "utmp malloc failed");
 		if (statbf.st_size && utmp) {
-			nutmp = read(f, (char *)utmp, (int)statbf.st_size);
+			nutmp = read(f, utmp, (int)statbf.st_size);
 			nutmp /= sizeof(struct utmp);
 
 			for (u = utmp ; u < &utmp[nutmp] ; u++) {
@@ -1679,7 +1679,7 @@ rmut(void)
 				SCPYN(u->ut_host, "");
 #endif
 				time(&u->ut_time);
-				write(f, (char *)u, sizeof(wtmp));
+				write(f, u, sizeof(wtmp));
 				found++;
 			}
 		}
@@ -1694,7 +1694,7 @@ rmut(void)
 			SCPYN(wtmp.ut_host, "");
 #endif
 			time(&wtmp.ut_time);
-			write(f, (char *)&wtmp, sizeof(wtmp));
+			write(f, &wtmp, sizeof(wtmp));
 			close(f);
 		}
 	}
diff --git a/appl/telnet/telnetd/telnetd.c b/appl/telnet/telnetd/telnetd.c
index 207dd73e7..a7035e60a 100644
--- a/appl/telnet/telnetd/telnetd.c
+++ b/appl/telnet/telnetd/telnetd.c
@@ -402,7 +402,7 @@ int main(int argc, char **argv)
 		int szi = sizeof(int);
 #endif /* SO_SEC_MULTI */
 
-		memset((char *)&dv, 0, sizeof(dv));
+		memset(&dv, 0, sizeof(dv));
 
 		if (getsysv(&sysv, sizeof(struct sysv)) != 0) {
 			perror("getsysv");
diff --git a/appl/telnet/telnetd/termstat.c b/appl/telnet/telnetd/termstat.c
index d1d9273c9..2af283183 100644
--- a/appl/telnet/telnetd/termstat.c
+++ b/appl/telnet/telnetd/termstat.c
@@ -599,7 +599,7 @@ defer_terminit()
 	if (def_col || def_row) {
 		struct winsize ws;
 
-		memset((char *)&ws, 0, sizeof(ws));
+		memset(&ws, 0, sizeof(ws));
 		ws.ws_col = def_col;
 		ws.ws_row = def_row;
 		ioctl(ourpty, TIOCSWINSZ, (char *)&ws);
diff --git a/lib/roken/glob.c b/lib/roken/glob.c
index ad28fe701..76317c725 100644
--- a/lib/roken/glob.c
+++ b/lib/roken/glob.c
@@ -648,7 +648,7 @@ globextend(const Char *path, glob_t *pglob)
 
 	newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 	pathv = pglob->gl_pathv ? 
-		    realloc((char *)pglob->gl_pathv, newsize) :
+		    realloc(pglob->gl_pathv, newsize) :
 		    malloc(newsize);
 	if (pathv == NULL)
 		return(GLOB_NOSPACE);