diff --git a/sj3lib/level1.c b/sj3lib/level1.c
index 24d872a..6018b97 100644
--- a/sj3lib/level1.c
+++ b/sj3lib/level1.c
@@ -162,21 +162,22 @@ put_cmd(int cmd)
 
 #define put_string put_ndata
 
-static u_char*
-put_ndata(u_char* p, int n)
+static u_char *
+put_ndata(void *p, int n)
 {
-	while (n-- > 0) put_byte(p ? *p++ : 0);
-	return p;
+	u_char *pp = (u_char *)p;
+
+	while (n-- > 0)
+		put_byte(pp ? *pp++ : 0);
+	return pp;
 }
 
 static int
-put_over(
-	int	buflen,
-	int	n,
-	u_char* (*func1)(), u_char* str1, int len1,
-	u_char* (*func2)(), u_char* str2, int len2,
-	u_char* (*func3)(), u_char* str3, int len3,
-	u_char* (*func4)(), u_char* str4, int len4)
+put_over(int buflen, int n,
+    u_char *(*func1)(), void *str1, int len1,
+    u_char *(*func2)(), void *str2, int len2,
+    u_char *(*func3)(), void *str3, int len3,
+    u_char *(*func4)(), void *str4, int len4)
 {
 #define ARGNUM 4
   u_char *(*func[ARGNUM])();
@@ -184,10 +185,18 @@ put_over(
   int len[ARGNUM];
   int i;
 
-  func[0] = func1; data[0] = str1; len[0] = len1;
-  func[1] = func2; data[1] = str2; len[1] = len2;
-  func[2] = func3; data[2] = str3; len[2] = len3;
-  func[3] = func4; data[3] = str4; len[3] = len4;
+	func[0] = func1;
+	data[0] = (u_char *)str1;
+	len[0] = len1;
+	func[1] = func2;
+	data[1] = (u_char *)str2;
+	len[1] = len2;
+	func[2] = func3;
+	data[2] = (u_char *)str3;
+	len[2] = len3;
+	func[3] = func4;
+	data[3] = (u_char *)str4;
+	len[3] = len4;
 
   for(i = 0; i < n; i++) {
     if (len[i] < buflen) {
@@ -287,11 +296,13 @@ get_nstring(u_char* p, int n)
 	return n;
 }
 
-static u_char*
-get_ndata(u_char* p, int n)
+static u_char *
+get_ndata(void *p, int n)
 {
-	while (n-- > 0) *p++ = get_byte();
-	return p;
+	u_char *pp = (u_char *)p;
+	while (n-- > 0)
+		*pp++ = get_byte();
+	return pp;
 }
 
 static void