Changeset 113 for trunk/kernel/libk/memcpy.c

Timestamp:

Jun 30, 2017, 11:03:08 AM (7 years ago)

Author:

max@…

Message:

add memcmp in libk; these mem* functions should probably be hal-
specific, for better performance

File:

• trunk/kernel/libk/memcpy.c (modified) (5 diffs)

trunk/kernel/libk/memcpy.c

@@ -28 +28 @@
 void * memcpy( void       * dst,
                const void * src,
-               uint32_t     size) 
+               uint32_t     size)
 {
     uint32_t       * wdst = dst;
@@ -36 +36 @@
     if (!((uint32_t) wdst & 3) && !((uint32_t) wsrc & 3) )
     {
-        while (size > 3) 
+        while (size > 3)
         {
             *wdst++ = *wsrc++;
@@ -47 +47 @@
 
     // byte per byte for last bytes (or not aligned)
-    while (size--) 
+    while (size--)
     {
         *cdst++ = *csrc++;
@@ -55 +55 @@
 
 //////////////////////////////
-void * memset( void     * dst, 
+void * memset( void     * dst,
                uint32_t   val,
-               uint32_t   size) 
+               uint32_t   size)
 {
     // build 8 bits and 32 bits values
@@ -86 +86 @@
 }
 
+//////////////////////////////
+int memcmp( const void * s1,
+            const void * s2,
+            uint32_t     n)
+{
+    const uint8_t * cs1 = s1;
+    const uint8_t * cs2 = s2;
+
+    while (n > 0)
+    {
+        if (*cs1++ != *cs2++)
+            return (*--cs1 - *--cs2);
+        n--;
+    }
+    return 0;
+}
+