- Add the 'restrict' qualifier to the definitions of the string

concatenation and copy functions using the '__restrict' macro.
   This is to satisfy IEEE Std 1003-1.2001.
 - Use ANSI-C function definitions.
 - Add the 'restrict' keyword to the manual pages, too.

lib/libc/string/strcat.3

@@ -47,9 +47,9 @@
 .Sh SYNOPSIS
 .In string.h
 .Ft char *
-.Fn strcat "char *s" "const char *append"
+.Fn strcat "char *restrict s" "const char *restrict append"
 .Ft char *
-.Fn strncat "char *s" "const char *append" "size_t count"
+.Fn strncat "char *restrict s" "const char *restrict append" "size_t count"
 .Sh DESCRIPTION
 The
 .Fn strcat

lib/libc/string/strcat.c

@@ -40,9 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 
 char *
-strcat(s, append)
-	char *s;
-	const char *append;
+strcat(char *__restrict s, const char *__restrict append)
 {
 	char *save = s;
 

lib/libc/string/strcpy.3

@@ -47,9 +47,9 @@
 .Sh SYNOPSIS
 .In string.h
 .Ft char *
-.Fn strcpy "char *dst" "const char *src"
+.Fn strcpy "char *restrict dst" "const char *restrict src"
 .Ft char *
-.Fn strncpy "char *dst" "const char *src" "size_t len"
+.Fn strncpy "char *restrict dst" "const char *restrict src" "size_t len"
 .Sh DESCRIPTION
 The
 .Fn strcpy

lib/libc/string/strcpy.c

@@ -40,9 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <string.h>
 
 char *
-strcpy(to, from)
-	char *to;
-	const char *from;
+strcpy(char *__restrict to, const char *__restrict from)
 {
 	char *save = to;
 

lib/libc/string/strncat.c

@@ -47,10 +47,7 @@ __FBSDID("$FreeBSD$");
  * are written at dst (at most n+1 bytes being appended).  Return dst.
  */
 char *
-strncat(dst, src, n)
-	char *dst;
-	const char *src;
-	size_t n;
+strncat(char *__restrict dst, const char *__restrict src, size_t n)
 {
 	if (n != 0) {
 		char *d = dst;

lib/libc/string/strncpy.c

@@ -47,10 +47,7 @@ __FBSDID("$FreeBSD$");
  * Return dst.
  */
 char *
-strncpy(dst, src, n)
-	char *dst;
-	const char *src;
-	size_t n;
+strncpy(char *__restrict dst, const char *__restrict src, size_t n)
 {
 	if (n != 0) {
 		char *d = dst;