🆕 malloc 、printf

user/libs/libc/string.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <libc/sys/types.h>
+
+void *memset(void *dst, unsigned char C, uint64_t size)
+{
+
+    int d0, d1;
+    unsigned long tmp = C * 0x0101010101010101UL;
+    __asm__ __volatile__("cld	\n\t"
+                         "rep	\n\t"
+                         "stosq	\n\t"
+                         "testb	$4, %b3	\n\t"
+                         "je	1f	\n\t"
+                         "stosl	\n\t"
+                         "1:\ttestb	$2, %b3	\n\t"
+                         "je	2f\n\t"
+                         "stosw	\n\t"
+                         "2:\ttestb	$1, %b3	\n\t"
+                         "je	3f	\n\t"
+                         "stosb	\n\t"
+                         "3:	\n\t"
+                         : "=&c"(d0), "=&D"(d1)
+                         : "a"(tmp), "q"(size), "0"(size / 8), "1"(dst)
+                         : "memory");
+    return dst;
+}
+
+size_t strlen(const char *s)
+{
+    register size_t __res = 0;
+    while (s[__res] != '\0')
+    {
+        ++__res;
+    }
+    return __res;
+}