Add restrict keyword to string functions.

Reviewed by:	bde

4 files changed, 6 insertions, 13 deletions

diff --git a/sys/libkern/strcat.c b/sys/libkern/strcat.c
index e517c08..2117be1 100644
--- a/sys/libkern/strcat.c
+++ b/sys/libkern/strcat.c
@@ -36,9 +36,7 @@
 #include <sys/libkern.h>
 
 char *
-strcat(s, append)
-	register char *s;
-	register const char *append;
+strcat(char * __restrict s, const char * __restrict append)
 {
 	char *save = s;
 
diff --git a/sys/libkern/strcpy.c b/sys/libkern/strcpy.c
index 3aed2d0..dd25c60 100644
--- a/sys/libkern/strcpy.c
+++ b/sys/libkern/strcpy.c
@@ -36,9 +36,7 @@
 #include <sys/libkern.h>
 
 char *
-strcpy(to, from)
-	register char *to;
-	register const char *from;
+strcpy(char * __restrict to, const char * __restrict from)
 {
 	char *save = to;
 
diff --git a/sys/libkern/strncpy.c b/sys/libkern/strncpy.c
index a8b51a7..07039c3 100644
--- a/sys/libkern/strncpy.c
+++ b/sys/libkern/strncpy.c
@@ -43,10 +43,7 @@
  * Return dst.
  */
 char *
-strncpy(dst, src, n)
-	char *dst;
-	const char *src;
-	register size_t n;
+strncpy(char * __restrict dst, const char * __restrict src, size_t n)
 {
 	if (n != 0) {
 		register char *d = dst;
diff --git a/sys/sys/libkern.h b/sys/sys/libkern.h
index bb0c0a7..947de94 100644
--- a/sys/sys/libkern.h
+++ b/sys/sys/libkern.h
@@ -89,14 +89,14 @@ char	*rindex(const char *, int);
 int	 scanc(u_int, const u_char *, const u_char *, int);
 int	 skpc(int, int, char *);
 void	 srandom(u_long);
-char	*strcat(char *, const char *);
+char	*strcat(char * __restrict, const char * __restrict);
 int	 strcmp(const char *, const char *);
-char	*strcpy(char *, const char *);
+char	*strcpy(char * __restrict, const char * __restrict);
 size_t	 strlcat(char *, const char *, size_t);
 size_t	 strlcpy(char *, const char *, size_t);
 size_t	 strlen(const char *);
 int	 strncmp(const char *, const char *, size_t);
-char	*strncpy(char *, const char *, size_t);
+char	*strncpy(char * __restrict, const char * __restrict, size_t);
 char	*strsep(char **, const char *delim);
 int	 strvalid(const char *, size_t);