[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit

Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/build/uClibc/libc/string/ffs.c b/ap/build/uClibc/libc/string/ffs.c
new file mode 100644
index 0000000..f39d304
--- /dev/null
+++ b/ap/build/uClibc/libc/string/ffs.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2002     Manuel Novoa III
+ * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <limits.h>
+#include <string.h>
+  
+int ffs(int i)
+{
+#if 1
+	/* inlined binary search method */
+	char n = 1;
+#if UINT_MAX == 0xffffU
+	/* nothing to do here -- just trying to avoiding possible problems */
+#elif UINT_MAX == 0xffffffffU
+	if (!(i & 0xffff)) {
+		n += 16;
+		i >>= 16;
+	}
+#else
+#error ffs needs rewriting!
+#endif
+
+	if (!(i & 0xff)) {
+		n += 8;
+		i >>= 8;
+	}
+	if (!(i & 0x0f)) {
+		n += 4;
+		i >>= 4;
+	}
+	if (!(i & 0x03)) {
+		n += 2;
+		i >>= 2;
+	}
+	return (i) ? (n + ((i+1) & 0x01)) : 0;
+
+#else
+	/* linear search -- slow, but small */
+	int n;
+
+	for (n = 0 ; i ; ++n) {
+		i >>= 1;
+	}
+
+	return n;
+#endif
+}
+libc_hidden_def(ffs)
+#if ULONG_MAX == UINT_MAX
+strong_alias_untyped(ffs, ffsl)
+#endif