Add BSD compatible strlcpy function (uc_strlcpy)

include/ucore/string.h

@@ -101,6 +101,18 @@ char * uc_human_bytesz_dec(uint64_t bytes, char *result, size_t result_len);
 //(base 2 ,1 KiB == 1024 bytes)
 char * uc_human_bytesz_bin(uint64_t bytes, char *result, size_t result_len);
 
+/** Copy a C string ensuring dst is nul terminated.
+ *  If @max is 0, no action is done
+ *  src must be a nul terminated string
+ *
+ * @param dst destination buffer
+ * @param src source string
+ * @maram max max chars (including nul terminator to copy). This should
+ *            is normally the size of the dst buffer)
+ * return strlen(src) which may be larger than the no. of bytes copied.
+ */
+size_t uc_strlcpy(char *dst, const char *src, size_t max);
+
 #ifdef __cplusplus
 }
 #endif