Support URL parameters

Now, http_payload includes a list of human-readable parameters that can
be read (but not modified) by users. Given the following example link:

/test?key1=value1&key2=value2

This will generate two parameters, with the following values:

{
	.args =
	{
		[0] = {.key = "key1", .value = "value1"},
		[1] = {.key = "key2", .value = "value2"}
	},

	.n_args = 2
}

As expected, if any URL parameters are given, struct http_payload member
"resource" is accordingly trimmed so as not to include any parameters.
Therefore, considering the example above:

{.args = {...}, .resource = "/test"}

Limitations:

- Since the definition of struct http_arg is both shared by http.h
(as a read-only pointer within struct http_payload) and http.c
(as a read/write pointer within struct ctx), its members (namely key
and value) must remain as read/write pointers, even if they must not
be modified by users of http.h.

1 files changed, 7 insertions, 0 deletions

diff --git a/http.h b/http.h
index ed0770f..8b3a286 100644
--- a/http.h
+++ b/http.h
@@ -35,6 +35,13 @@ struct http_payload
             } *files;
         } post;
     } u;
+
+    const struct http_arg
+    {
+        char *key, *value;
+    } *args;
+
+    size_t n_args;
 };
 
 #define HTTP_STATUSES \