implement cactus damage

* Added cactus damage for players and issues the respective death message.

Halts if condition is reached

* style nitpicks

---------

Co-authored-by: p2r3 <p2r3@p2r3.com>

Author: hew02

include/globals.h

@@ -142,6 +142,9 @@
 // every time a block is broken.
 #define ENABLE_PICKUP_ANIMATION
 
+// If defined, players are able to receive damage from nearby cacti.
+#define ENABLE_CACTUS_DAMAGE
+
 // If defined, logs unrecognized packet IDs
 // #define DEV_LOG_UNKNOWN_PACKETS
 

src/procedures.c

@@ -1389,10 +1389,14 @@ void hurtEntity (int entity_id, int attacker_id, uint8_t damage_type, uint8_t da
         strcpy((char *)recv_buffer + player_name_len, " was slain by ");
         strcpy((char *)recv_buffer + player_name_len + 14, attacker->name);
         recv_buffer[player_name_len + 14 + strlen(attacker->name)] = '\0';
+      } else if (damage_type == D_cactus) {
+        // Killed by being near a cactus
+        strcpy((char *)recv_buffer + player_name_len, " was pricked to death");
+        recv_buffer[player_name_len + 21] = '\0';
       } else {
         // Unknown death reason
         strcpy((char *)recv_buffer + player_name_len, " died");
-        recv_buffer[player_name_len + 4] = '\0';
+        recv_buffer[player_name_len + 5] = '\0';
       }
 
     } else player->health -= effective_damage;
@@ -1502,6 +1506,15 @@ void handleServerTick (int64_t time_since_last_tick) {
     if (block >= B_lava && block < B_lava + 4) {
       hurtEntity(player->client_fd, -1, D_lava, 8);
     }
+    #ifdef ENABLE_CACTUS_DAMAGE
+    // Tick damage from a cactus block if one is under/inside or around the player.
+    if (block == B_cactus ||
+      getBlockAt(player->x + 1, player->y, player->z) == B_cactus ||
+      getBlockAt(player->x - 1, player->y, player->z) == B_cactus ||
+      getBlockAt(player->x, player->y, player->z + 1) == B_cactus ||
+      getBlockAt(player->x, player->y, player->z - 1) == B_cactus
+    ) hurtEntity(player->client_fd, -1, D_cactus, 4);
+    #endif
     // Heal from saturation if player is able and has enough food
     if (player->health >= 20 || player->health == 0) continue;
     if (player->hunger < 18) continue;