allow binary zero in unescaped GET arguments (see mailinglist)

doc/examples/logging.c

@@ -15,11 +15,16 @@
 
 
 static int
-print_out_key (void *cls, enum MHD_ValueKind kind, const char *key,
-               const char *value)
+print_out_key (void *cls,
+	       enum MHD_ValueKind kind,
+	       const char *key,
+               const char *value,
+	       size_t value_size)
 {
-  (void)cls;    /* Unused. Silent compiler warning. */
-  (void)kind;   /* Unused. Silent compiler warning. */
+  (void) cls;    /* Unused. Silent compiler warning. */
+  (void) kind;   /* Unused. Silent compiler warning. */
+  (void) value_size;
+  
   printf ("%s: %s\n", key, value);
   return MHD_YES;
 }
@@ -38,7 +43,9 @@ answer_to_connection (void *cls, struct MHD_Connection *connection,
   (void)con_cls;           /* Unused. Silent compiler warning. */
   printf ("New %s request for %s using version %s\n", method, url, version);
 
-  MHD_get_connection_values (connection, MHD_HEADER_KIND, print_out_key,
+  MHD_get_connection_values (connection,
+			     MHD_HEADER_KIND,
+			     &print_out_key,
                              NULL);
 
   return MHD_NO;

doc/libmicrohttpd.texi

@@ -1356,7 +1356,7 @@ reason for request termination see @code{MHD_OPTION_NOTIFY_COMPLETED}.
 @end deftypefn
 
 
-@deftypefn {Function Pointer} int {*MHD_KeyValueIterator} (void *cls, enum MHD_ValueKind kind, const char *key, const char *value)
+@deftypefn {Function Pointer} int {*MHD_KeyValueIterator} (void *cls, enum MHD_ValueKind kind, const char *key, const char *value, size_t value_size)
 Iterator over key-value pairs.  This iterator can be used to iterate
 over all of the cookies, headers, or @code{POST}-data fields of a
 request, and also to iterate over the headers that have been added to a
@@ -1375,6 +1375,17 @@ key for the value, can be an empty string
 @item value
 value corresponding value, can be NULL
 
+@item value_size
+number of bytes in @code{value}. This argument was introduced in
+@code{MHD_VERSION} 0x00096301 to allow applications to use binary
+zeros in values.  Applications using this argument must ensure that
+they are using a sufficiently recent version of MHD, i.e. by testing
+@code{MHD_get_version()} for values above or equal to 0.9.64.
+Applications that do not need zeros in values and that want to compile
+without warnings against newer versions of MHD should not declare this
+argument and cast the function pointer argument to
+@code{MHD_KeyValueIterator}.
+
 @end table
 
 Return @code{MHD_YES} to continue iterating, @code{MHD_NO} to abort the