3 files changed, 9 insertions, 1 deletions
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index ac547c7..92442ac 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -1,4 +1,4 @@
-int printf(const char* fmt, ...);
+int printf(const char* fmt, ...)  __attribute__ ((format (printf, 1, 2)));;
 int puts(const char*);
 int putchar(int);
 
diff --git a/libc/include/string.h b/libc/include/string.h
index 650a7ac..05050a0 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -1,3 +1,4 @@
 #include <stddef.h>
 int strlen(const char*);
 void* memset(void*, int, size_t);
+void* memcpy(void*, void*, size_t);
diff --git a/libc/string.c b/libc/string.c
index 8a9e422..11d398f 100644
--- a/libc/string.c
+++ b/libc/string.c
@@ -18,3 +18,10 @@ void* memset(void *buf, int val, size_t sz)
     }
     return buf;
 }
+
+void* memcpy(void *dest, void *src, size_t sz)
+{
+    while(sz--)
+        *(char*)dest++ = *(char*)src++;
+    return dest;
+}