ARM: boot: Add an implementation of strnlen for libfdt

Recent versions of libfdt add a dependency on strnlen. Copy the
implementation in lib/string.c here, so we can update libfdt.

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/arch/arm/boot/compressed/string.c b/arch/arm/boot/compressed/string.c
index 36e53ef9200f236d7ad2c5e8cdcb9b7b372f0aa3..68946744873677292a32652828cd7accedd3e858 100644 (file)
--- a/arch/arm/boot/compressed/string.c
+++ b/arch/arm/boot/compressed/string.c
@@ -65,6 +65,15 @@ size_t strlen(const char *s)
        return sc - s;
 }
 
+size_t strnlen(const char *s, size_t count)
+{
+       const char *sc;
+
+       for (sc = s; count-- && *sc != '\0'; ++sc)
+               /* nothing */;
+       return sc - s;
+}
+
 int memcmp(const void *cs, const void *ct, size_t count)
 {
        const unsigned char *su1 = cs, *su2 = ct, *end = su1 + count;