From 82bc592d50c9d4c80cb96a4f3c91ce275a96f433 Mon Sep 17 00:00:00 2001
From: Tobin <tobin.cooney@gmail.com>
Date: Fri, 17 Apr 2026 17:54:42 -0400
Subject: [PATCH] basic key handling

---
 main.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 82 insertions(+), 7 deletions(-)

diff --git a/main.c b/main.c
index 3420927..8af5576 100644
--- a/main.c
+++ b/main.c
@@ -1,29 +1,102 @@
 #include "cat_api.h"
 #include <time.h>
 
-#define NS_PER_TICK 30000000
-
 void bye(void)
 {
 	printf("bye!\n");
 	exit(0);
 }
 
+struct keydowns
+{
+	char k;
+	struct keydowns* next;
+};
+
+struct keydowns* first_keydown = NULL;
+
+void add_keydown(char k)
+{
+	struct keydowns* new = malloc(sizeof(struct keydowns));
+	new->k = k;
+	new->next = NULL;
+	if (first_keydown == NULL) first_keydown = new;
+	else
+	{
+		struct keydowns* head;
+		for (head = first_keydown; head->next != NULL; head = head->next)
+			if (head->k == k) return;
+		head->next = new;
+	}
+}
+
+void lit_remove_keydown(struct keydowns* entry)
+{
+	if (first_keydown == entry) first_keydown = entry->next;
+	else
+	{
+		struct keydowns* head;
+		for (head = first_keydown; head->next != entry; head = head->next) ;
+		head->next = entry->next;
+	}
+}
+
+void remove_keydown(char k)
+{
+	struct keydowns* head;
+	for (head = first_keydown; head != NULL; head = head->next)
+		if (head->k == k) lit_remove_keydown(head);
+}
+
+int is_held(char k)
+{
+	struct keydowns* head;
+	for (head = first_keydown; head != NULL; head = head->next)
+		if (head->k == k) return 1;
+	return 0;
+}
+
+void key_down(char k)
+{
+	add_keydown(k);
+	printf("%c pressed!\n", k);
+}
+
+void key_up(char k)
+{
+	remove_keydown(k);
+	printf("%c un-pressed\n", k);
+}
+
+void mouse_move(int x, int y)
+{
+}
+
+void mouse_down(unsigned char button)
+{
+}
+
+void mouse_up(unsigned char button)
+{
+}
+
 void process_input(void)
 {
 	struct cat_event* e = cat_get_event();
 	if (e == NULL) return;
 	if (e->type == QUIT) bye();
-	else if (e->type == KEYDOWN) printf("keypress! %c\n", e->key);
-	else if (e->type == KEYUP) printf("key up! %c\n", e->key);
-	else if (e->type == MOUSEMOVE) printf("mouse move! (%d, %d)\n", e->mousex, e->mousey);
-	else if (e->type == MOUSEDOWN) printf("mouse down! %02x\n", e->mouse_button);
-	else if (e->type == MOUSEUP) printf("mouse up! %02x\n", e->mouse_button);
+	else if (e->type == KEYDOWN)	key_down(e->key);
+	else if (e->type == KEYUP)	key_up(e->key);
+	else if (e->type == MOUSEMOVE)	mouse_move(e->mousex, e->mousey);
+	else if (e->type == MOUSEDOWN)	mouse_down(e->mouse_button);
+	else if (e->type == MOUSEUP)	mouse_up(e->mouse_button);
 }
 
 static long last_sec = 0;
 static long last_nsec = 0;
 
+#define NS_PER_TICK 30000000
+
 void tick(void)
 {
 	/* run every N milliseconds... nanoseconds? idk */
@@ -35,6 +108,8 @@ void tick(void)
 	else return;
 	yes:	last_sec = t.tv_sec;
 		last_nsec = t.tv_nsec;
+
+	/* code to run every tick goes here */
 }
 
 void game_loop(void)