uri.[hc]: improved support for 'coaps' URI scheme

include/coap/uri.h

@@ -13,6 +13,18 @@
 #include "hashkey.h"
 #include "str.h"
 
+/**
+ * The scheme specifiers. Secure schemes have an odd numeric value,
+ * others are even.
+ */
+enum coap_uri_scheme_t {
+  COAP_URI_SCHEME_COAP=0,
+  COAP_URI_SCHEME_COAPS=1
+};
+
+/** This mask can be used to check if a parsed URI scheme is secure. */
+#define COAP_URI_SCHEME_SECURE_MASK 0x01
+
 /**
  * Representation of parsed URI. Components may be filled from a string with
  * coap_split_uri() and can be used as input for option-creation functions.
@@ -23,8 +35,16 @@ typedef struct {
   str path;             /**< Beginning of the first path segment. 
                              Use coap_split_path() to create Uri-Path options */
   str query;            /**<  The query part if present */
+
+  /** The parsed scheme specifier. */
+  enum coap_uri_scheme_t scheme;
 } coap_uri_t;
 
+static inline int
+coap_uri_scheme_is_secure(const coap_uri_t *uri) {
+  return uri && ((uri->scheme & COAP_URI_SCHEME_SECURE_MASK) != 0);
+}
+
 /**
  * Creates a new coap_uri_t object from the specified URI. Returns the new
  * object or NULL on error. The memory allocated by the new coap_uri_t

src/uri.c

@@ -74,6 +74,10 @@ coap_split_uri(unsigned char *str_var, size_t len, coap_uri_t *uri) {
   /* There might be an additional 's', indicating the secure version: */
   if (len && (secure = tolower(*p) == 's')) {
     ++p; --len;
+    uri->scheme = COAP_URI_SCHEME_COAPS;
+    uri->port = COAPS_DEFAULT_PORT;
+  } else {
+    uri->scheme = COAP_URI_SCHEME_COAP;
   }
 
   q = (unsigned char *)"://";