Make tox.c unambiguously parseable.

Rules:
1. Constants are uppercase names: THE_CONSTANT.
2. SUE[1] types start with an uppercase letter and have at least one
   lowercase letter in it: The_Type, THE_Type.
3. Function types end in "_cb": tox_friend_connection_cb.
4. Variable and function names are all lowercase: the_function.

This makes it easier for humans reading the code to determine what an
identifier means. I'm not convinced by the enum type name change, but I
don't know a better rule. Currently, a lot of enum types are spelled like
constants, which is confusing.

[1] struct/union/enum

1 files changed, 1 insertions, 1 deletions

diff --git a/toxcore/tox_api.c b/toxcore/tox_api.c
index 31f21158..87123968 100644
--- a/toxcore/tox_api.c
+++ b/toxcore/tox_api.c
@@ -5,7 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-#define SET_ERROR_PARAMETER(param, x) {if(param) {*param = x;}}
+#define SET_ERROR_PARAMETER(param, x) do { if (param) { *param = x; } } while (0)
 
 
 #define CONST_FUNCTION(lowercase, uppercase) \