diff --git a/modules/src/string/ack_string.h b/modules/src/string/ack_string.h
index 56b646e4c..a74e89f18 100644
--- a/modules/src/string/ack_string.h
+++ b/modules/src/string/ack_string.h
@@ -13,9 +13,9 @@ char *strzero(char *s);
 char *str2bts(char *s, char *b, int *n);
 char *long2str(long l, int b);
 long str2long(char *s, int b);
-char *btscpy(char *s1, char *s2, int n);
-char *btscat(char *s1, int n1, char *s2, int n2);
-int btscmp(char *s1, int n1, char *s2, int n2);
+char *btscpy(char *b1, char *b2, int n);
+char *btscat(char *b1, int n1, char *b2, int n2);
+int btscmp(char *b1, int n1, char *b2, int n2);
 char *btszero(char *b, int n);
 char *bts2str(char *b, int n, char *s);
 
diff --git a/modules/src/string/btscat.c b/modules/src/string/btscat.c
index f5d58781e..2506007a7 100644
--- a/modules/src/string/btscat.c
+++ b/modules/src/string/btscat.c
@@ -8,12 +8,7 @@
 
 #include "ack_string.h"
 
-char *
-btscat(b1, n1, b2, n2)
-	char *b1;
-	int n1;
-	register char *b2;
-	register int n2;
+char *btscat(char* b1, int n1, register char *b2, register int n2)
 {
 	register char *b = b1 + n1;
 
diff --git a/modules/src/string/btscmp.c b/modules/src/string/btscmp.c
index 30300babb..5f9ad329a 100644
--- a/modules/src/string/btscmp.c
+++ b/modules/src/string/btscmp.c
@@ -8,12 +8,9 @@
 
 #include "ack_string.h"
 
-int
-btscmp(b1, n1, b2, n2)
-	register char *b1, *b2;
-	int n1, n2;
+int btscmp(register char *b1, int n1, register char *b2, int n2)
 {
-	register n = (n1 <= n2) ? n1 : n2;
+	register int n = (n1 <= n2) ? n1 : n2;
 
 	while (n-- > 0) {
 		if (*b1++ != *b2++)
diff --git a/modules/src/string/btscpy.c b/modules/src/string/btscpy.c
index e54606dcd..fe43ea43b 100644
--- a/modules/src/string/btscpy.c
+++ b/modules/src/string/btscpy.c
@@ -8,10 +8,7 @@
 
 #include "ack_string.h"
 
-char *
-btscpy(b1, b2, n)
-	register char *b1, *b2;
-	register int n;
+char *btscpy(register char *b1, register char *b2, register int n)
 {
 	char *b1s = b1;
 
diff --git a/modules/src/string/btszero.c b/modules/src/string/btszero.c
index f7e36634b..edb50577d 100644
--- a/modules/src/string/btszero.c
+++ b/modules/src/string/btszero.c
@@ -8,10 +8,7 @@
 
 #include "ack_string.h"
 
-char *
-btszero(b, n)
-	char *b;
-	register int n;
+char *btszero(char *b, register int n)
 {
 	register char *s = b;
 
diff --git a/modules/src/string/long2str.c b/modules/src/string/long2str.c
index 5ace9bd43..eb54ac285 100644
--- a/modules/src/string/long2str.c
+++ b/modules/src/string/long2str.c
@@ -14,10 +14,7 @@
 
 #define MAXWIDTH 32
 
-char *
-long2str(val, base)
-	register long val;
-	register base;
+char *long2str(register long val, register int base)
 {
 	static char numbuf[MAXWIDTH];
 	static char vec[] = "0123456789ABCDEF";
@@ -40,10 +37,10 @@ long2str(val, base)
 		if (base < 0) {			/* unsigned */
 			base = -base;
 			if (val < 0L) {	/* taken from Amoeba src */
-				register mod, i;
+				register int mod, i;
 			overflow:
 				mod = 0;
-				for (i = 0; i < 8 * sizeof val; i++) {
+				for (i = 0; i < 8 * (int)sizeof(val); i++) {
 					mod <<= 1;
 					if (val < 0)
 						mod++;
diff --git a/modules/src/string/str2bts.c b/modules/src/string/str2bts.c
index d3fd6d856..c9ad2aac1 100644
--- a/modules/src/string/str2bts.c
+++ b/modules/src/string/str2bts.c
@@ -8,9 +8,7 @@
 
 #include "ack_string.h"
 
-static
-is_oct(c)
-	char c;
+static int is_oct(char c)
 {
 	return ((unsigned int)(c-'0') <= ('7'-'0'));
 }
@@ -20,11 +18,7 @@ is_oct(c)
 	The ascii length of the resulting string is returned, including the
 	terminating null-character.
 */
-char *
-str2bts(str, bts, pn)
-	register char *str;
-	char *bts;
-	int *pn;
+char *str2bts(register char *str, char *bts, int *pn)
 {
 	register char *t = bts;
 
@@ -53,7 +47,7 @@ str2bts(str, bts, pn)
 				break;
 			default:
 				if (is_oct(*str)) {
-					register cnt = 0, oct = 0;
+					register int cnt = 0, oct = 0;
 
 					do
 						oct = oct * 8 + *str - '0';
diff --git a/modules/src/string/str2long.c b/modules/src/string/str2long.c
index 66760b91f..3225449eb 100644
--- a/modules/src/string/str2long.c
+++ b/modules/src/string/str2long.c
@@ -8,9 +8,7 @@
 
 #include "ack_string.h"
 
-value(c, b)
-	char c;
-	int b;
+static int value(char c, int b)
 {
 	register int ch;
 
@@ -23,10 +21,7 @@ value(c, b)
 	return b;
 }
 
-long
-str2long(str, base)
-	register char *str;
-	int base;
+long str2long(register char *str, int base)
 {
 	int minus = 0, d;
 	long l = 0;
diff --git a/modules/src/string/strindex.c b/modules/src/string/strindex.c
index 66d2e432f..1d901b72f 100644
--- a/modules/src/string/strindex.c
+++ b/modules/src/string/strindex.c
@@ -8,10 +8,7 @@
 
 #include "ack_string.h"
 
-char *
-strindex(s, c)
-	register char *s;
-	int c;
+char *strindex(register char *s, int c)
 {
 	while (*s)
 		if (*s++ == c)
diff --git a/modules/src/string/string.3 b/modules/src/string/string.3
index 8d1877a22..bb12a31f9 100644
--- a/modules/src/string/string.3
+++ b/modules/src/string/string.3
@@ -9,46 +9,27 @@ conversions between strings and row of bytes
 .nf
 .B #include <ack_string.h>
 .PP
-.B char *strindex(s, c)
-.B char *s, c;
+.B char *strindex(char *s, int c)
 .PP
-.B char *strrindex(s, c)
-.B char *s, c;
+.B char *strrindex(char *s, int c)
 .PP
-.B char *strzero(s)
-.B char *s;
+.B char *strzero(char *s)
 .PP
-.B char *str2bts(s, b, pn)
-.B char *s, *b;
-.B int *pn;
+.B char *str2bts(char *s, char *b, int *n)
 .PP
-.B char *long2str(l, base)
-.B long l;
-.B int base;
+.B char *long2str(long l, int b)
 .PP
-.B long str2long(s, base)
-.B char *s;
-.B int base;
+.B long str2long(char *s, int b)
 .PP
-.B char *btscpy(b1, b2, n)
-.B char *b1, *b2;
-.B int n;
+.B char *btscpy(char *b1, char *b2, int n)
 .PP
-.B char *btscat(b1, n1, b2, n2)
-.B char *b1, *b2;
-.B int n1, n2;
+.B char *btscat(char *b1, int n1, char *b2, int n2)
 .PP
-.B int btscmp(b1, n1, b2, n2)
-.B char *b1, *b2;
-.B int n1, n2;
+.B int btscmp(char *b1, int n1, char *b2, int n2)
 .PP
-.B char *btszero(b, n)
-.B char *b;
-.B int n;
+.B char *btszero(char *b, int n)
 .PP
-.B char *bts2str(b, n, s)
-.B char *b, *s;
-.B int n;
+.B char *bts2str(char *b, int n, char *s)
 .fi
 .SH DESCRIPTION
 The 
@@ -60,7 +41,7 @@ functions operate on variable-length rows of bytes,
 regardless of null bytes.
 Neither of these functions check for overflow of any receiving area.
 .PP
-.I Strindex
+.I strindex
 .RI ( strrindex )
 returns a pointer to the first (last)
 occurrence of character 
@@ -72,12 +53,12 @@ or zero if
 does not occur in
 .IR s .
 .PP
-.I Strzero
+.I strzero
 turns
 .I s
 into a null string.
 .PP
-.I Bts2str
+.I bts2str
 turns a row of
 .I n
 consecutive bytes, the first of which is pointed by
@@ -100,7 +81,7 @@ is turned into the string consisting of the following characters
 .RE
 The latter string could be represented in C as "\e\e000\e\en".
 .PP
-.I Str2bts
+.I str2bts
 turns string
 .I s
 into a sequence of bytes pointed by
@@ -108,7 +89,7 @@ into a sequence of bytes pointed by
 It has the inverse effect to
 .IR bts2str .
 The length of the resulting byte sequence is returned in
-.RI * pn .
+.RI *n .
 .br
 Both the functions
 .I bts2str
@@ -116,7 +97,7 @@ and
 .I str2bts
 return a pointer to the result.
 .PP
-.I Long2str
+.I long2str
 converts a long value
 .I l
 into a null-terminated string according to
@@ -126,13 +107,13 @@ This base may be any of 2..16.
 A negative base (in the range -16..-2) indicates that the long must be
 seen as unsigned.
 A pointer to the string is returned.
-.I Str2long
+.I str2long
 returns the value that is represented in
 .IR s ,
 according to
 .IR base .
 .PP
-.I Btscpy
+.I btscpy
 copies
 .I n
 bytes from the string of bytes
@@ -142,7 +123,7 @@ to
 and returns
 .IR b1 .
 .PP
-.I Btscat
+.I btscat
 appends a copy of
 .I n2
 bytes from
@@ -152,10 +133,10 @@ to the end of
 consisting of
 .I n1
 bytes.
-.I B1
+.I b1
 is returned.
 .PP
-.I Btscmp
+.I btscmp
 compares row of bytes
 .I b1
 with length 
@@ -170,12 +151,12 @@ is lexicographically greater then, equal to, or less than
 .IR b2 ,
 respectively.
 .PP
-.I Btszero
+.I btszero
 places
 .I n
 null bytes in the string
 .IR b .
-.I B
+.I b
 is returned.
 .SH FILES
 ~em/modules/lib/libstring.a
diff --git a/modules/src/string/strrindex.c b/modules/src/string/strrindex.c
index 63947d835..0468ca8db 100644
--- a/modules/src/string/strrindex.c
+++ b/modules/src/string/strrindex.c
@@ -6,10 +6,7 @@
 
 #include "ack_string.h"
 
-char *
-strrindex(str, chr)
-	register char *str;
-	int chr;
+char *strrindex(register char *str, int chr)
 {
 	register char *retptr = 0;
 
diff --git a/modules/src/string/strzero.c b/modules/src/string/strzero.c
index 8a0d85060..94e9b90c6 100644
--- a/modules/src/string/strzero.c
+++ b/modules/src/string/strzero.c
@@ -8,9 +8,7 @@
 
 #include "ack_string.h"
 
-char *
-strzero(s)
-	char *s;
+char *strzero(char *s)
 {
 	*s = '\0';
 	return s;