fixed segmentation fault when sorting enemies

src/characters.cc

@@ -36,8 +36,8 @@ void character::apply_effect(potion *effect) {
 void character::insert_effect(potion *effect) {
         effects.push_back(effect);
 
-        for (int i = effects.size() - 1; i > 0; --i)
-                if (effect->get_priority() < effects[i - 1]->get_priority())
+        for (int i = effects.size() - 1; i > 0 &&
+             effect->get_priority() < effects[i - 1]->get_priority(); --i)
                 std::swap(effects[i], effects[i - 1]);
 }
 

src/enemies/halfling.cc

@@ -33,7 +33,7 @@ long_result halfling::get_hit(character *ch, const int tATK,
                                 " is slain by PC. "};
 
                 return {result::hit, "PC deals " +
-                        std::to_string(tmp) + " damage to " + abbrev};
+                        std::to_string(tmp) + " damage to " + abbrev + ". "};
         }
 
         return {miss, "PC tried to hit " + abbrev +

src/enemy.cc

@@ -77,7 +77,7 @@ long_result enemy_base::get_hit(character *ch, const int tATK,
                                 " is slain by PC. "};
 
                 return {result::hit, "PC deals " +
-                        std::to_string(tmp) + " damage to " + abbrev};
+                        std::to_string(tmp) + " damage to " + abbrev + ". "};
         }
 
         return {miss, "PC tried to hit " + abbrev + " but missed. "};

src/game.cc

@@ -41,17 +41,26 @@ void game::new_level() {
                                  rng, enabled_features));
 }
 
-#include <algorithm>
-bool compare_characters(const character *a, const character *b) {
-        return a->get_pos() < b->get_pos();
+enemy_list game::sort_enemies(const enemy_list &elist) {
+        enemy_list result;
+        result.reserve(elist.size());
+
+        for (auto enemy : elist) {
+                result.push_back(enemy);
+
+                for (int i = result.size() - 1; i > 0 &&
+                     enemy->get_pos() < result[i - 1]->get_pos(); --i)
+                        std::swap(result[i], result[i - 1]);
+        }
+
+        return result;
 }
 
 character *game::move_enemies() {
         if (the_world)
                 return nullptr;
 
-        auto enemies = levels[curr_level]->get_elist();
-        std::sort(enemies.begin(), enemies.end(), ::compare_characters);
+        auto enemies = sort_enemies(levels[curr_level]->get_elist());
 
         for (auto ch : enemies) {
                 bool hostile = ch->get_race() == rmerchant ?

src/game.h

@@ -52,6 +52,7 @@ public:
 private:
         void new_level();
         character *move_enemies();
+        enemy_list sort_enemies(const enemy_list &elist);
 };
 
 #endif

src/input/console_input.cc

@@ -31,7 +31,7 @@ game_command console_input::get_command() {
 
                 return (game_command)((tmp = get_direction(cmd)) ==
                                       game_command_panic
-                                      ? tmp : tmp - move_north +
+                                      ? tmp : tmp +
                                       (use ? apply_north : attack_north));
         } else if (cmd == "yes") {
                 return game_command::enter;