From 2b258007f0015ffe3977ad428c590f90348cbf91 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Sun, 7 Jun 2015 04:41:46 +0200
Subject: degesch: refactor MODE processing

---
 degesch.c | 84 +++++++++++++++++++++++++--------------------------------------
 1 file changed, 33 insertions(+), 51 deletions(-)

diff --git a/degesch.c b/degesch.c
index 54a2ff0..79242c7 100644
--- a/degesch.c
+++ b/degesch.c
@@ -3959,24 +3959,18 @@ irc_handle_kick (struct server *s, const struct irc_message *msg)
 
 struct mode_processor
 {
-	// Inputs to set after initialization:
-
 	char **params;                      ///< Mode string parameters
+	bool adding;                        ///< Currently adding modes
+	char mode_char;                     ///< Currently processed mode char
+
+	// User data:
 
 	struct server *s;                   ///< Server
 	struct channel *channel;            ///< The channel being modified
-
-	// Internals:
-
-	bool adding;                        ///< Currently adding modes
-	char mode_char;                     ///< Currently processed mode char
 };
 
-static void
-mode_processor_init (struct mode_processor *self)
-{
-	memset (self, 0, sizeof *self);
-}
+/// Process a single mode character
+typedef bool (*mode_processor_fn) (struct mode_processor *, char);
 
 static const char *
 mode_processor_next_param (struct mode_processor *self)
@@ -3986,6 +3980,26 @@ mode_processor_next_param (struct mode_processor *self)
 	return *self->params++;
 }
 
+static void
+mode_processor_run (struct mode_processor *self,
+	char **params, mode_processor_fn apply_cb)
+{
+	self->params = params;
+
+	const char *mode_string;
+	while ((mode_string = mode_processor_next_param (self)))
+	{
+		self->adding = true;
+		while ((self->mode_char = *mode_string++))
+		{
+			if      (self->mode_char == '+') self->adding = true;
+			else if (self->mode_char == '-') self->adding = false;
+			else if (!apply_cb (self, self->mode_char))
+				break;
+		}
+	}
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static void
@@ -4068,15 +4082,11 @@ mode_processor_do_param_never (struct mode_processor *self)
 }
 
 static bool
-mode_processor_step (struct mode_processor *self, char mode_char)
+mode_processor_apply_channel (struct mode_processor *self, char mode_char)
 {
 	struct server *s = self->s;
-	self->mode_char = mode_char;
-
-	if      (mode_char == '+') self->adding = true;
-	else if (mode_char == '-') self->adding = false;
 
-	else if (strchr (s->irc_chanuser_modes,           mode_char))
+	if      (strchr (s->irc_chanuser_modes,           mode_char))
 		mode_processor_do_user           (self);
 
 	else if (strchr (s->irc_chanmodes_list,           mode_char))
@@ -4099,33 +4109,17 @@ static void
 irc_handle_mode_channel
 	(struct server *s, struct channel *channel, char **params)
 {
-	struct mode_processor p;
-	mode_processor_init (&p);
-
-	p.params = params;
-	p.s = s;
-	p.channel = channel;
-
-	const char *mode_string;
-	while ((mode_string = mode_processor_next_param (&p)))
-	{
-		mode_processor_step (&p, '+');
-		while (*mode_string)
-			if (!mode_processor_step (&p, *mode_string++))
-				break;
-	}
+	struct mode_processor p = { .s = s, .channel = channel };
+	mode_processor_run (&p, params, mode_processor_apply_channel);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 static bool
-mode_processor_step_user (struct mode_processor *self, char mode_char)
+mode_processor_apply_user (struct mode_processor *self, char mode_char)
 {
 	struct server *s = self->s;
 
-	if (mode_char == '+') { self->adding = true;  return true; }
-	if (mode_char == '-') { self->adding = false; return true; }
-
 	struct str *modes = &s->irc_user_mode;
 	const char *pos = strchr (modes->str, mode_char);
 	if (self->adding == !!pos)
@@ -4144,20 +4138,8 @@ mode_processor_step_user (struct mode_processor *self, char mode_char)
 static void
 irc_handle_mode_user (struct server *s, char **params)
 {
-	struct mode_processor p;
-	mode_processor_init (&p);
-
-	p.params = params;
-	p.s = s;
-
-	const char *mode_string;
-	while ((mode_string = mode_processor_next_param (&p)))
-	{
-		mode_processor_step (&p, '+');
-		while (*mode_string)
-			if (!mode_processor_step_user (&p, *mode_string++))
-				break;
-	}
+	struct mode_processor p = { .s = s };
+	mode_processor_run (&p, params, mode_processor_apply_user);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-- 
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