1 files changed, 25 insertions, 0 deletions
diff --git a/na/lib/string/strlen.c b/na/lib/string/strlen.c
new file mode 100644
index 0000000..76e14f2
--- /dev/null
+++ b/na/lib/string/strlen.c
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: MIT */
+/* Derived from musl libc (Copyright © 2005-2020 Rich Felker, et al.) */
+
+#include <string.h>
+#include <stdint.h>
+#include <limits.h>
+
+#define ALIGN (sizeof(size_t))
+#define ONES ((size_t)-1/UCHAR_MAX)
+#define HIGHS (ONES * (UCHAR_MAX/2+1))
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
+
+size_t strlen(const char *s)
+{
+	const char *a = s;
+#ifdef __GNUC__
+	typedef size_t __attribute__((__may_alias__)) word;
+	const word *w;
+	for (; (uintptr_t)s % ALIGN; s++) if (!*s) return s-a;
+	for (w = (const void *)s; !HASZERO(*w); w++);
+	s = (const void *)w;
+#endif
+	for (; *s; s++);
+	return s-a;
+}