route all casting through a single cast_spell function.

src/battle.c

@@ -1749,15 +1749,9 @@ void do_combatmagic(battle * b, combatmagic_t was)
             fighter *fig = co->magician.fig;
             const spell *sp = co->sp;
 
-            level = co->level;
-            if (!sp->cast) {
-                log_error("spell '%s' has no function.\n", sp->sname);
-            }
-            else {
-                level = sp->cast(co);
-                if (level > 0) {
-                    pay_spell(fig->unit, sp, level, 1);
-                }
+            level = cast_spell(co);
+            if (level > 0) {
+                pay_spell(fig->unit, sp, level, 1);
             }
         }
     }
@@ -1771,7 +1765,7 @@ static int cast_combatspell(troop at, const spell * sp, int level, double force)
     castorder co;
 
     create_castorder_combat(&co, at.fighter, sp, level, force);
-    level = sp->cast(&co);
+    level = cast_spell(&co);
     free_castorder(&co);
     if (level > 0) {
         pay_spell(at.fighter->unit, sp, level, 1);
@@ -1840,12 +1834,7 @@ static void do_combatspell(troop at)
         return;
     }
 
-    if (!sp->cast) {
-        log_error("spell '%s' has no function.\n", sp->sname);
-    }
-    else {
-        level = cast_combatspell(at, sp, level, power);
-    }
+    level = cast_combatspell(at, sp, level, power);
 }
 
 /* Sonderattacken: Monster patzern nicht und zahlen auch keine
@@ -1860,9 +1849,6 @@ static void do_extra_spell(troop at, const att * a)
     if (!sp) {
         log_error("no such spell: '%s'", a->data.sp->name);
     }
-    else if (sp->cast == NULL) {
-        log_error("spell '%s' has no function.", sp->sname);
-    }
     else {
         assert(a->level > 0);
         cast_combatspell(at, sp, a->level, a->level);

src/bind_unit.c

@@ -512,15 +512,10 @@ static void unit_castspell(unit * u, const char *name, int level)
     if (sp) {
         spellbook *book = unit_get_spellbook(u);
         if (spellbook_get(book, sp)) {
-            if (!sp->cast) {
-                log_error("spell '%s' has no function.\n", sp->sname);
-            }
-            else {
-                castorder co;
-                create_castorder(&co, u, 0, sp, u->region, level, (double)level, 0, 0, 0);
-                sp->cast(&co);
-                free_castorder(&co);
-            }
+            castorder co;
+            create_castorder(&co, u, 0, sp, u->region, level, (double)level, 0, 0, 0);
+            cast_spell(&co);
+            free_castorder(&co);
         }
     }
 }

src/kernel/jsonconf.c

@@ -595,7 +595,7 @@ static void json_spells(cJSON *json) {
                     continue;
                 }
                 else if (strcmp(item->string, "cast") == 0) {
-                    sp->cast = (spell_f)get_function(item->valuestring);
+                    sp->cast_fun = (spell_f)get_function(item->valuestring);
                 }
                 else if (strcmp(item->string, "syntax") == 0) {
                     sp->syntax = strdup(item->valuestring);

src/kernel/spell.h

@@ -41,7 +41,7 @@ extern "C" {
         int sptyp;
         int rank;                   /* Reihenfolge der Zauber */
         struct spell_component *components;
-        spell_f cast;
+        spell_f cast_fun;
     } spell;
 
     typedef struct spellref {

src/kernel/xmlreader.c

@@ -1423,7 +1423,7 @@ static int parse_spells(xmlDocPtr doc)
                     xmlFree(propValue);
                 }
             }
-            sp->cast = (spell_f)cast;
+            sp->cast_fun = (spell_f)cast;
             xmlXPathFreeObject(result);
 
             /* reading eressea/spells/spell/resource */

src/magic.c

@@ -1433,7 +1433,7 @@ static void do_fumble(castorder * co)
     case 5:
     case 6:
         /* Spruch gelingt, aber alle Magiepunkte weg */
-        co->level = sp->cast(co);
+        co->level = cast_spell(co);
         set_spellpoints(u, 0);
         ADDMSG(&u->faction->msgs, msg_message("patzer4", "unit region spell",
             u, r, sp));
@@ -1444,7 +1444,7 @@ static void do_fumble(castorder * co)
     case 9:
     default:
         /* Spruch gelingt, alle nachfolgenden Sprüche werden 2^4 so teuer */
-        co->level = sp->cast(co);
+        co->level = cast_spell(co);
         ADDMSG(&u->faction->msgs, msg_message("patzer5", "unit region spell",
             u, r, sp));
         countspells(u, 3);
@@ -2900,7 +2900,7 @@ void magic(void)
                     fumbled = true;
                 }
                 else {
-                    co->level = sp->cast(co);
+                    co->level = cast_spell(co);
                     if (co->level <= 0) {
                         /* Kosten nur für real benötige Stufe berechnen */
                         continue;
@@ -3003,6 +3003,12 @@ spell *unit_getspell(struct unit *u, const char *name, const struct locale * lan
     return 0;
 }
 
+int cast_spell(struct castorder *co)
+{
+    const spell *sp = co->sp;
+    return sp->cast_fun(co);
+}
+
 static critbit_tree cb_spellbooks;
 
 spellbook * get_spellbook(const char * name)

src/magic.h

@@ -286,6 +286,7 @@ extern "C" {
     /* Hänge c-order co an die letze c-order von cll an */
     void free_castorders(struct castorder *co);
     /* Speicher wieder freigeben */
+    int cast_spell(struct castorder *co);
 
     /* Prüfroutinen für Zaubern */
     int countspells(struct unit *u, int step);

src/magic.test.c

@@ -378,7 +378,7 @@ void test_multi_cast(CuTest *tc) {
 
     test_setup();
     sp = create_spell("fireball", 0);
-    sp->cast = cast_fireball;
+    sp->cast_fun = cast_fireball;
     CuAssertPtrEquals(tc, sp, find_spell("fireball"));
 
     lang = test_create_locale();