[Add] About time I added timer support for AI.

[Fix] Buffer overflow in AI.

scripts/ai/API

@@ -1,3 +1,10 @@
+// ================
+// CONSTANTS!
+// ================
+
+number player
+  -- players pilot id.
+
 // ================
 // TASKS!
 // ================
@@ -124,6 +131,20 @@ shoot([number weapon])
 getenemy()
   -- return the id of the nearest enemy.
 
+// ================
+// TIMERS!
+// ================
+
+settimer(number t, number delay)
+  -- Set timer t to wait for delay ms.
+    -- t      - Timer to set.
+    -- delay  - Delay time in ms to wait.
+    -- return nil.
+
+timeup(number t)
+  -- Return true if time is up for timer t.
+    -- t - timer to check.
+    -- return boolean true if timer t is up.
 
 // ================
 // MISC!

scripts/ai/basic.lua

@@ -0,0 +1,59 @@
+-- Required control rate.
+control_rate = 2
+
+-- Required "control" function.
+function control()
+  if taskname() == "none" then
+    pushtask(0, "fly")
+  end
+end
+
+-- Required "attacked" function.
+function attacked(attacker)
+  if taskname() ~= "attack" and task ~= "runaway" then
+    -- Let's have some taunts.
+    if attacker == player then
+      local msg = rng(0,4)
+      if msg == 0 then say("You will never kill me!")
+      elseif msg == 1 then say("DIE!")
+      elseif msg == 2 then say("You won't survive!")
+      elseif msg == 3 then say("I hate you!")
+      end
+    end
+    pushtask(0, "attack", attacker)
+  end
+end
+
+-- Runs away.
+function runaway()
+  local target = gettargetid()
+  local dir = face(target, 1)
+  accel()
+end
+
+-- Attack
+function attack()
+  local target = gettargetid()
+  local dir = face(target)
+  local dist = getdist(getpos(target))
+
+  if parmor() < 70 then
+    poptask()
+    pushtask(0, "runaway", target)
+  elseif dir < 10 and dist > 300 then
+    accel()
+  elseif dir < 10 and dist < 300 then
+    shoot()
+  end
+end
+
+-- Fly to the player.
+function fly()
+  local target = 0
+  local dir = face(target)
+  local dist = getdist(getpos(target))
+  if dir < 10 and dist > 300 then
+    accel()
+  end
+end
+

scripts/ai/merchant.lua

@@ -4,7 +4,8 @@ control_rate = 2
 -- Required "control" function.
 function control()
   if taskname() == "none" then
-    pushtask(0, "fly")
+    local planet = getrndplanet()
+    pushtask(0, "go", planet)
   end
 end
 
@@ -13,7 +14,7 @@ function attacked(attacker)
   if taskname() ~= "runaway" then
     -- Let's have some messages.
     if attacker == player then
-      msg = rng(0,4)
+      local msg = rng(0,4)
       if msg == 0 then say("ARGH! Please don't hurt me.")
       elseif msg == 1 then say("HEY! We are simply a merchant vessle.")
       elseif msg == 2 then say("LEAVE! ME! ALONE!")
@@ -26,18 +27,39 @@ end
 
 -- Runs away.
 function runaway()
-  target = gettargetid()
-  dir = face(target, 1)
+  local target = gettargetid()
+  local dir = face(target, 1)
   accel()
 end
 
--- Fly to the player.
-function fly()
-  target = 0
-  dir = face(target)
-  dist = getdist(getpos(target))
-  if dir < 10 and dist > 300 then
+-- Fly to the target.
+function go()
+  local target = gettarget()
+  local dir = face(target)
+  local dist = getdist(target)
+  local bdist = minbrakedist()
+  if dir < 10 and dist > bdist then
     accel()
+  elseif dir < 10 and dist < bdist then
+    poptask()
+    pushtask(0, "stop")
+  end
+end
+
+-- Backthrust.
+function stop()
+  brake()
+  if isstopped() then
+    poptask()
+    settimer(0, rng(3000, 5000))
+    pushtask(0, "land")
+  end
+end
+
+--Waits.
+function land()
+  if timeup(0) then
+    pushtask(0, "runaway", player)
   end
 end
 

scripts/ai/test.lua

@@ -13,7 +13,7 @@ function attacked(attacker)
   if taskname() ~= "attack" and task ~= "runaway" then
     -- Let's have some taunts.
     if attacker == player then
-      msg = rng(0,4)
+      local msg = rng(0,4)
       if msg == 0 then say("You will never kill me!")
       elseif msg == 1 then say("DIE!")
       elseif msg == 2 then say("You won't survive!")
@@ -26,16 +26,16 @@ end
 
 -- Runs away.
 function runaway()
-  target = gettargetid()
-  dir = face(target, 1)
+  local target = gettargetid()
+  local dir = face(target, 1)
   accel()
 end
 
 -- Attack
 function attack()
-  target = gettargetid()
-  dir = face(target)
-  dist = getdist(getpos(target))
+  local target = gettargetid()
+  local dir = face(target)
+  local dist = getdist(getpos(target))
 
   if parmor() < 70 then
     poptask()
@@ -49,9 +49,9 @@ end
 
 -- Fly to the player.
 function fly()
-  target = 0
-  dir = face(target)
-  dist = getdist(getpos(target))
+  local target = 0
+  local dir = face(target)
+  local dist = getdist(getpos(target))
   if dir < 10 and dist > 300 then
     accel()
   end

src/ai.c

@@ -47,13 +47,15 @@
 // ============================================================
 
 // Call the AI function with name f.
-#define AI_LCALL(f)         (lua_getglobal(L, f), lua_pcall(L, 0, 0, 0))
-#define lua_regnumber(s,n)  (lua_pushnumber(L,n), lua_setglobal(L,s))
+#define AI_LCALL(f)           (lua_getglobal(L, f), lua_pcall(L, 0, 0, 0))
+#define lua_regnumber(l,s,n)  (lua_pushnumber(l,n), lua_setglobal(l,s))
+#define luaL_dobuffer(L,b,n,s) (luaL_loadbuffer(L,b,n,s) || lua_pcall(L, 0, LUA_MULTRET, 0))
 
 // Don't run the function if (n) params aren't passed.
 #define MIN_ARGS(n) if(lua_gettop(L) < n) return 0
 
-#define MAX_DIR_ERR 5.0*M_PI/180.
+#define MIN_DIR_ERR 5.0*M_PI/180.
+#define MAX_DIR_ERR 2.5*M_PI/180.
 #define MIN_VEL_ERR 2.5
 
 // file info.
@@ -104,6 +106,9 @@ static int ai_getrndplanet(lua_State* L);       // pointer getrndplanet()
 // Combat.
 static int ai_shoot(lua_State* L);              // shoot(number) number = 1,2,3.
 static int ai_getenemy(lua_State* L);           // number getenemy().
+// Timers.
+static int ai_settimer(lua_State* L);           // settimer(number, number)
+static int ai_timeup(lua_State* L);             // bool timeup(number)
 // Misc.
 static int ai_createvect(lua_State* L);         // createvect(number, number)
 static int ai_say(lua_State* L);                // say(string)
@@ -149,7 +154,8 @@ int ai_init(void) {
 
 // Init an IA_Profile and add it to the stack.
 static int ai_loadProfile(char* filename) {
-  char* buf;
+  char* buf = NULL;
+  uint32_t bufsize = 0;
 
   profiles = realloc(profiles, sizeof(AI_Profile)*(++nprofiles));
   profiles[nprofiles-1].name = strndup(filename+strlen(AI_PREFIX),
@@ -168,7 +174,7 @@ static int ai_loadProfile(char* filename) {
   //luaL_openlibs(L);
 
   // Constants.
-  lua_regnumber("player", PLAYER_ID); // Player id.
+  lua_regnumber(L, "player", PLAYER_ID); // Player id.
 
   // Register C funstions in Lua.
   // Tasks.
@@ -200,14 +206,18 @@ static int ai_loadProfile(char* filename) {
   // Combat.
   lua_register(L, "shoot",              ai_shoot);
   lua_register(L, "getenemy",           ai_getenemy);
+  // Timers.
+  lua_register(L, "settimer",           ai_settimer);
+  lua_register(L, "timeup",             ai_timeup);
   // Misc.
   lua_register(L, "createvect",         ai_createvect);
   lua_register(L, "say",                ai_say);
   lua_register(L, "rng",                ai_rng);
 
-  buf = pack_readfile(DATA, filename, NULL);
 
-  if(luaL_dostring(L, buf) != 0) {
+  // Now load the file, since all the functions have been previously loaded.
+  buf = pack_readfile(DATA, filename, &bufsize);
+  if(luaL_dobuffer(L, buf, bufsize, filename) != 0) {
     ERR("loading AI file: %s", filename);
     ERR("%s", lua_tostring(L, -1));
     WARN("Most likely Lua file has improper syntax, please check it.");
@@ -234,7 +244,12 @@ AI_Profile* ai_getProfile(char* name) {
 
 // Clean up global AI
 void ai_exit(void) {
-  lua_close(L);
+  int i;
+  for(i = 0; i < nprofiles; i++) {
+    free(profiles[i].name);
+    lua_close(profiles[i].L);
+  }
+  free(profiles);
 }
 
 // Heart of hearts of the ai!! Brains of the pilot.
@@ -572,6 +587,28 @@ static int ai_getenemy(lua_State* L) {
   return 1;
 }
 
+// Set the timer.
+static int ai_settimer(lua_State* L) {
+  MIN_ARGS(2);
+
+  int n; // Get the timer.
+  if(lua_isnumber(L, 1)) n = lua_tonumber(L,1);
+
+  cur_pilot->timer[n] = (lua_isnumber(L,2)) ? lua_tonumber(L,2) + SDL_GetTicks() : 0;
+  return 0;
+}
+
+// Check the timer.
+static int ai_timeup(lua_State* L) {
+  MIN_ARGS(1);
+
+  int n; // Get the timer.
+  if(lua_isnumber(L,1)) n = lua_tonumber(L,1);
+
+  lua_pushboolean(L, cur_pilot->timer[n] < SDL_GetTicks());
+  return 1;
+}
+
 // Create a vector.
 static int ai_createvect(lua_State* L) {
   MIN_ARGS(2);

src/ai.h

@@ -1,6 +1,9 @@
 #pragma once
 #include "lua.h"
 
+// Max number of AI timers.
+#define MAX_AI_TIMERS 2
+
 typedef enum { TYPE_NULL, TYPE_INT, TYPE_PTR } TaskData;
 
 // Basic task.

src/faction.c

@@ -42,6 +42,9 @@ Faction* faction_get(const char* name) {
 // Return 1 if Faction a and b are enemies.
 int areEnemies(Faction* a, Faction* b) {
   int i = 0;
+  
+  if(a == b) return 0;
+
   for(i = 0; i < a->nenemies; i++)
     if(a->enemies[i] == b)
       return 1;
@@ -55,6 +58,9 @@ int areEnemies(Faction* a, Faction* b) {
 // Return 1 if Faction a and b are allies.
 int areAllies(Faction* a, Faction* b) {
   int i = 0;
+
+  if(a == b) return 0;
+
   for(i = 0; i < a->nallies; i++)
     if(a->allies[i] == b)
       return 1;

src/pilot.h

@@ -53,6 +53,7 @@ typedef struct Pilot {
   // AI.
   AI_Profile* ai; // Ai personality profile.
   unsigned int tcontrol; // Timer for control tick.
+  unsigned int timer[MAX_AI_TIMERS]; // Timers for AI.
   Task* task; // Current action.
 } Pilot;