Improve performance of strncpy.

diff --git a/ChangeLog b/ChangeLog
index 5e45a58..4e557a7 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,8 @@
-2014-09-23  Wilco Dijkstra  <wdijkstr@arm.com>
+2014-11-24  Wilco Dijkstra  <wdijkstr@arm.com>
+
+       * string/strncpy.c (strncpy): Improve performance by using memset.
+
+2014-11-24  Wilco Dijkstra  <wdijkstr@arm.com>
 
        * string/strcpy.c (strcpy):
        Improve performance by using strlen and memcpy.

diff --git a/string/strncpy.c b/string/strncpy.c
index 0915e03..d5fa5be 100644 (file)
--- a/string/strncpy.c
+++ b/string/strncpy.c
@@ -57,10 +57,10 @@ STRNCPY (char *s1, const char *s2, size_t n)
          if (--n4 == 0)
            goto last_chars;
        }
-      n = n - (s1 - s) - 1;
-      if (n == 0)
-       return s;
-      goto zero_fill;
+      s1++;
+      n = n - (s1 - s);
+      memset (s1, '\0', n);
+      return s;
     }
 
  last_chars:
@@ -77,11 +77,7 @@ STRNCPY (char *s1, const char *s2, size_t n)
     }
   while (c != '\0');
 
- zero_fill:
-  do
-    *++s1 = '\0';
-  while (--n > 0);
-
+  memset (s1 + 1, '\0', n);
   return s;
 }
 libc_hidden_builtin_def (strncpy)