Implemented memset()

photon/libc/string/memset.c

@@ -0,0 +1,28 @@
+#include <stddef.h>
+
+void *memset(void *ptr, int value, size_t sz)
+{
+    value = (unsigned char)value;
+    unsigned int realval =
+         value        |
+        (value << 8)  |
+        (value << 16) |
+        (value << 24);
+
+    unsigned char *buf = ptr;
+    size_t i = 0;
+    for (i = 0; i < sz; i += sizeof(unsigned int)) {
+        unsigned int *t = (unsigned int *)&buf[i];
+        *t = realval;
+    }
+
+    if (sz % sizeof(unsigned int)) {
+        i -= sizeof(unsigned int);
+
+        while (i < sz) {
+            buf[i++] = value;
+        }
+    }
+
+    return ptr;
+}