xv6: use stosb for memset

82201353 · rsc · c396d065 · 82201353 · 82201353
--- a/string.c
+++ b/string.c
 #include "types.h"
+#include "x86.h"
 void*
 memset(void *dst, int c, uint n)
 {
-  char *d;
+  stosb(dst, c, n);
-  d = (char*)dst;
-  while(n-- > 0)
-    *d++ = c;
  return dst;
 }

--- a/ulib.c
+++ b/ulib.c
@@ -2,6 +2,7 @@
 #include "stat.h"
 #include "fcntl.h"
 #include "user.h"
+#include "x86.h"
 char*
 strcpy(char *s, char *t)
@@ -35,11 +36,7 @@ strlen(char *s)
 void*
 memset(void *dst, int c, uint n)
 {
-  char *d;
+  stosb(dst, c, n);
-  d = dst;
-  while(n-- > 0)
-    *d++ = c;
  return dst;
 }