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bot.c
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bot.c
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#ifndef WIN32
#include "config.h"
#endif
#include <stdio.h>
#include <signal.h>
#include <math.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_SIGINFO_H
#include <siginfo.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <ctype.h>
#if (!defined(WIN32))
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef TM_IN_SYS_TIME
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#else
#include <time.h>
#endif
#include <errno.h>
#include <stdlib.h>
#ifndef WIN32
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#ifndef __USE_GNU
#define __USE_GNU
#endif
#else
#include <winsock.h>
#endif
#include <string.h>
#include "sprite.h"
#include "data.h"
#include "cfg.h"
#include "net.h"
#include "hash.h"
#include "time.h"
#include "math.h"
#include "getopt.h"
#include "error.h"
#ifdef WIN32
int consoleApp=1;
#endif
#define N_NAMES 18
#define CAN_SEE_X 60
#define CAN_SEE_Y 10
/* some empty functions and variables */
void c_shutdown(void){}
void init_blit(void){}
void shutdown_blit(void){}
int SCREEN_X=1,SCREEN_Y=1;
unsigned char *screen,*screen_a;
#ifdef TRI_D
unsigned char *screen2,*screen2_a;
#endif
static int in_signal_handler=0;
static int level_sprites_start;
static int level_number=-1;
/* my health, armor, frags, deaths, ammo, ... and ID */
static unsigned char health,armor;
static unsigned int frags,deaths;
static unsigned short ammo[ARMS];
static unsigned char current_weapon;
static unsigned char weapons;
static int my_id;
/* for use with the -n option */
static char *static_name=NULL;
/* connection with server */
static int connected=0;
int console_ok=1;
/* networking */
int fd; /* socket */
static struct sockaddr_in server; /* server address */
/* objects */
static struct it* hero;
static unsigned long_long game_start_offset; /* time difference between game start on this machine and on server */
static struct /* keyboard status */
{
unsigned char right,left,jump,creep,speed,fire,weapon,down_ladder;
}keyboard_status;
static char *names[N_NAMES]={
"Terminator",
"Jack The Ripper",
"Rambo",
"Exhumator",
"Assassin",
"Arnold",
"Necromancer",
"Predator",
"Rocky",
"Harvester",
"Lamer",
"Killme",
"Looser",
"Krueger",
"I'll kill you",
"Zombieman",
"Hellraiser",
"Eraser"
};
static int direction=0; /* 0=stop, 1=left, 2=right */
static int const1,const2,const3,const4;
static unsigned short port=DEFAULT_PORT;
static char *host;
static int priority;
/* 0=nothing
* 1=kill player
* 2=find rifle
* 3=find shotgun
* 4=find UZI
* 5=find grenades
* 6=find gun ammo
* 7=find shotgun ammo
* 8=find rifle ammo
* 9=find uzi ammo
* 10=find medikit
*/
/*-----------------------------------------------------------------------*/
#define can_see(a,b) (a<add_int(hero->x,CAN_SEE_X)&&a>sub_int(hero->x,CAN_SEE_X)&&b>sub_int(hero->y,CAN_SEE_Y)&&b<add_int(hero->y,CAN_SEE_Y))
static int odds(int p)
{
return (random()%1000)<p;
}
/* free all before exit */
static void clear_memory(void)
{
struct object_list *o;
for (o=&objects;o->next;)
delete_obj(o->next->member.id);
free_area();
shutdown_sprites();
free_sprites(0);
}
/* shut down the client */
static void shut_down(int a)
{
if (a)
{
clear_memory();
free_packet_buffer();
check_memory_leaks();
EXIT(0);
}
}
/* find address of server and fill the server address structure */
static char * find_server(char *name,unsigned short port)
{
struct hostent *h;
h=gethostbyname(name);
if (!h)return "Error: Can't resolve server address.\n";
server.sin_family=AF_INET;
server.sin_port=htons(port);
server.sin_addr=*((struct in_addr*)(h->h_addr_list[0]));
return 0;
}
/* initialize socket */
static char * init_socket(void)
{
fd=socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
if(fd<0)return "Can't get socket.\n";
return 0;
}
#define MAX_COUNT 32
/* send quit request to server */
static void send_quit(void)
{
char p;
fd_set rfds;
struct timeval tv;
int a=sizeof(server);
int count=0;
tv.tv_sec=2;
tv.tv_usec=0;
FD_ZERO(&rfds);
FD_SET(fd,&rfds);
send_again:
p=P_QUIT_REQUEST;
count ++;
send_packet(&p,1,(struct sockaddr *)(&server),my_id,0);
if (!select(fd+1,&rfds,0,0,&tv)&&count<=MAX_COUNT)goto send_again;
recv_packet(&p,1,(struct sockaddr*)(&server),&a,1,my_id,0);
if (p!=P_PLAYER_DELETED&&count<=MAX_COUNT)goto send_again;
}
#undef MAX_COUNT
/* initiate connection with server */
static char * contact_server(int color, char *name)
{
static char packet[256];
int l=strlen(name)+1;
int a,r;
int min,maj;
fd_set fds;
struct timeval tv;
tv.tv_sec=4;
tv.tv_usec=0;
FD_ZERO(&fds);
FD_SET(fd,&fds);
packet[0]=P_NEW_PLAYER;
packet[1]=0;
packet[2]=VERSION_MAJOR;
packet[3]=VERSION_MINOR;
packet[4]=color;
if (l>MAX_NAME_LEN) {l=MAX_NAME_LEN; packet[5+MAX_NAME_LEN]='\0';}
memcpy(packet+5,name,l);
printf("Using name \"%s\".\n", packet+5);
send_packet(packet,l+5,(struct sockaddr*)(&server),my_id,0);
if (!select(fd+1,&fds,NULL,NULL,&tv))return "No reply within 4 seconds.\n";
if ((r=recv_packet(packet,256,0,0,1,0,0))<0)
{
if (errno==EINTR)return "Server hung up.\n";
else return "Connection error.\n";
}
switch(*packet)
{
case P_PLAYER_REFUSED:
switch(packet[1])
{
case E_INCOMPATIBLE_VERSION:
return "Incompatible client version. Connection refused.\n";
case E_NAME_IN_USE:
return "This name is already in use. Connection refused.\n";
default:
return "Connection refused.\n";
}
case P_PLAYER_ACCEPTED:
my_id=get_int(packet+35);
if (r<41){send_quit();return "Incompatible server version. Givin' up.\n";}
maj=packet[39];
min=packet[40];
if (maj!=VERSION_MAJOR||min<MIN_SERVER_VERSION_MINOR)
{send_quit();return "Incompatible server version. Givin' up.\n";}
game_start_offset=get_time();
game_start_offset-=get_long_long(packet+27);
health=100;
armor=0;
for(a=0;a<ARMS;a++)
ammo[a]=0;
ammo[0]=weapon[0].basic_ammo;
current_weapon=0;
weapons = WEAPON_MASK_GUN |
WEAPON_MASK_GRENADE |
WEAPON_MASK_CHAINSAW |
WEAPON_MASK_BLOODRAIN; /* gun, grenades, chainsaw
and bloodrain */
hero=new_obj(
get_int(packet+1), /* ID */
T_PLAYER, /* type */
0, /* time to live */
get_int16(packet+5), /* sprite */
0, /* position */
get_int(packet+23), /* status */
get_int(packet+7), /* X */
get_int(packet+11), /* Y */
get_int(packet+15), /* XSPEED */
get_int(packet+19), /* YSPEED */
0
);
break;
default:
return "Connection error.\n";
}
return 0;
}
/* I want to be born again */
static void send_reenter_game(void)
{
char packet;
packet=P_REENTER_GAME;
send_packet(&packet,1,(struct sockaddr*)(&server),my_id,0);
}
/* send chat message */
static void send_message(char *msg)
{
static char packet[MAX_MESSAGE_LENGTH + 2];
int len;
len = strlen(msg) + 1;
packet[0] = P_MESSAGE;
packet[1] = 0x00;
memcpy(packet + 2, msg, len);
send_packet(packet, len + 2, (struct sockaddr *)(&server), my_id, 0);
}
/* send end of game to server */
static void send_keyboard(void)
{
char packet[3];
packet[0]=P_KEYBOARD;
packet[1]= keyboard_status.right|
(keyboard_status.left<<1)|
(keyboard_status.jump<<2)|
(keyboard_status.creep<<3)|
(keyboard_status.speed<<4)|
(keyboard_status.fire<<5)|
(keyboard_status.down_ladder<<6);
packet[2]= keyboard_status.weapon;
send_packet(packet,3,(struct sockaddr*)(&server),my_id,0);
}
static void reset_keyboard(void)
{
keyboard_status.left=0;
keyboard_status.right=0;
keyboard_status.speed=1;
keyboard_status.jump=0;
keyboard_status.creep=0;
keyboard_status.fire=0;
keyboard_status.weapon=0;
keyboard_status.down_ladder=0;
}
static void test_object(struct it *obj)
{
if (obj==hero)return;
if (!can_see(obj->x,obj->y))return;
switch(obj->type)
{
case T_PLAYER:
if (obj->status&S_INVISIBLE)
break;
if (priority>1)
break;
priority=1;
keyboard_status.fire=1;
if (obj->x>hero->x)direction=2;
else direction=1;
if (my_abs(obj->x-hero->x)<int2double(30))direction=0;
break;
case T_BULLET:
case T_SHRAPNEL:
case T_BFGCELL:
case T_CHAIN:
if ((my_sgn(hero->x-obj->x)==my_sgn(obj->xspeed)||my_abs(hero->x-obj->x)<int2double(20))&&obj->y>=hero->y&&obj->y<hero->y+int2double(PLAYER_HEIGHT))
keyboard_status.creep=1;
break;
case T_RIFLE:
if (priority>2)break;
if ((weapons&(1<<WEAPON_RIFLE))&&ammo[WEAPON_RIFLE])break;
priority=2;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_SHOTGUN:
if (priority>3)break;
if ((weapons&(1<<WEAPON_SHOTGUN))&&ammo[WEAPON_SHOTGUN])break;
priority=3;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_UZI:
if (priority>4)break;
if ((weapons&(1<<WEAPON_UZI))&&ammo[WEAPON_UZI])break;
priority=4;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_AMMO_GRENADE:
if (priority>5)break;
if (!(weapons&(1<<WEAPON_GRENADE))||ammo[WEAPON_GRENADE])break;
priority=5;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_AMMO_GUN:
if (priority>6)break;
if (!(weapons&(1<<WEAPON_GUN))||ammo[WEAPON_GUN])break;
priority=6;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_AMMO_SHOTGUN:
if (priority>7)break;
if (!(weapons&(1<<WEAPON_SHOTGUN))||ammo[WEAPON_SHOTGUN])break;
priority=7;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_AMMO_RIFLE:
if (priority>8)break;
if (!(weapons&(1<<WEAPON_RIFLE))||ammo[WEAPON_RIFLE])break;
priority=8;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_AMMO_UZI:
if (priority>9)break;
if (!(weapons&(1<<WEAPON_UZI))||ammo[WEAPON_UZI])break;
priority=9;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
case T_MEDIKIT:
if (priority>10)break;
if (health>70)break;
priority=10;
if (obj->x>hero->x)direction=2;
else direction=1;
break;
}
}
/* destroys all objects except hero (before level change) */
static void clean_memory(void)
{
struct object_list *o;
/* delete all objects except hero */
for (o=&objects;o->next;)
if ((hero->id)!=(o->next->member.id))delete_obj(o->next->member.id);
else o=o->next;
}
static void change_level(void)
{
char *LEVEL;
char txt[256];
clean_memory();
free_sprites(level_sprites_start);
reinit_area();
LEVEL=load_level(level_number);
ERROR("Loading level \"%s\".\n",LEVEL);
snprintf(txt,256,"%s%s%s",DATA_PATH,LEVEL,LEVEL_SPRITES_SUFFIX);
load_sprites(txt);
snprintf(txt,256,"%s%s%s",DATA_PATH,LEVEL,STATIC_DATA_SUFFIX);
load_data(txt);
mem_free(LEVEL);
}
/* recompute object positions */
static void update_game(void)
{
struct object_list *p;
int w,h;
unsigned char stop_x,stop_y,sy;
unsigned long_long t;
int x,y,x1,y1,DELTA_TIME;
for(p=&objects;p->next;p=p->next)
{
if (p->next->member.type == T_NOTHING)
continue;
if (p->next->member.status & S_DEAD)
continue; /* dead player */
/* decrement time to live */
if (p->next->member.ttl>0)
{
p->next->member.ttl--;
if (!p->next->member.ttl)
{
if ((p->next->member.type)==T_PLAYER)
p->next->member.status &= ~S_SHOOTING;
else
{
if (p->next->member.type!=T_GRENADE){ /* client's waiting for P_EXPLODE_GRENADE and doesn't delete the grenade yet */
p=p->prev;
delete_obj(p->next->next->member.id);
continue;}
}
}
}
test_object(&(p->next->member));
/* maintain only objects that you are allowed to maintain */
if (!(obj_attr[p->next->member.type].maintainer&1))continue;
/* if not falling slow down x motion */
if (!(p->next->member.status & S_FALLING))
p->next->member.xspeed=mul(p->next->member.xspeed,obj_attr[p->next->member.type].slow_down_x);
/* fall */
if (obj_attr[p->next->member.type].fall)
{
p->next->member.status |= S_FALLING;
p->next->member.yspeed+=FALL_ACCEL;
/* but not too fast */
if (p->next->member.yspeed>MAX_Y_SPEED)p->next->member.yspeed=MAX_Y_SPEED;
}
get_dimensions(p->next->member.type,p->next->member.status,sprites[p->next->member.sprite].positions,&w,&h);
x=p->next->member.x;
y=p->next->member.y;
t=get_time();
DELTA_TIME=float2double(((double)(long_long)(t-p->next->member.last_updated))/MICROSECONDS);
update_position(
&(p->next->member),
p->next->member.x+mul(p->next->member.xspeed,DELTA_TIME),
p->next->member.y+mul(p->next->member.yspeed,DELTA_TIME),
w,h,&stop_x,&stop_y);
p->next->member.last_updated=t;
/* walk up the stairs */
if (stop_x&&p->next->member.type==T_PLAYER&&!(p->next->member.status & S_CREEP))
{
x1=p->next->member.x;
y1=p->next->member.y;
p->next->member.x=x;
p->next->member.y=y-int2double(1);
update_position(
&(p->next->member),
p->next->member.x+mul(p->next->member.xspeed,DELTA_TIME),
p->next->member.y+mul(p->next->member.yspeed,DELTA_TIME),
w,h,0,&sy);
if ((p->next->member.xspeed>0&&p->next->member.x<=x1)||(p->next->member.xspeed<0&&p->next->member.x>=x1)) /* restore original values */
{
p->next->member.x=x1;
p->next->member.y=y1;
}
else
{
stop_y=sy;
stop_x=0;
}
}
if (stop_x)p->next->member.xspeed=-mul(p->next->member.xspeed,obj_attr[p->next->member.type].bounce_x);
if (my_abs(p->next->member.xspeed)<MIN_X_SPEED)
{
p->next->member.xspeed=0;
p->next->member.status &= ~S_WALKING;
}
if (stop_y)
{
p->next->member.yspeed=mul(p->next->member.yspeed,obj_attr[p->next->member.type].bounce_y);
p->next->member.yspeed=-p->next->member.yspeed;
if (my_abs(p->next->member.yspeed)<MIN_Y_SPEED)
{
p->next->member.yspeed=0;
if (stop_y==1)p->next->member.status &= ~S_FALLING;
}
}
if ((p->next->member.type == T_SHRAPNEL || p->next->member.type == T_BULLET ||
p->next->member.type == T_BFGCELL || p->next->member.type == T_CHAIN) &&
(stop_x || stop_y)) { /* bullet and shrapnel die crashing into wall */
p=p->prev; /* deleting object makes a great mess in for cycle, so we must cheat the cycle */
delete_obj(p->next->next->member.id);
continue;
}
}
}
/* returns number of read bytes */
static int process_packet(char *packet,int l)
{
int a,n=l;
switch(*packet)
{
case P_CHUNK:
for (a=1;a<l&&a<MAX_PACKET_LENGTH;a+=n)
n=process_packet(packet+a,l-a);
break;
case P_NEW_OBJ:
if (l < (n=30))break; /* invalid packet */
new_obj(
get_int(packet+1), /* ID */
packet[27], /* type */
get_int16(packet+28), /* time to live */
get_int16(packet+5), /* sprite */
0, /* anim position */
get_int(packet+23), /* status */
get_int(packet+7), /* x */
get_int(packet+11), /* y */
get_int(packet+15), /* xspeed */
get_int(packet+19), /* yspeed */
0 /* data */
);
break;
case P_PLAYER_DELETED:
n=1;
shut_down(1);
break;
case P_DELETE_OBJECT:
if (l<5)break; /* invalid packet */
delete_obj(get_int(packet+1));
n=5;
break;
case P_UPDATE_OBJECT:
if (l < (n=28))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.x=get_int(packet+6);
p->member.y=get_int(packet+10);
p->member.xspeed=get_int(packet+14);
p->member.yspeed=get_int(packet+18);
p->member.status=get_int(packet+22);
p->member.data=0;
p->member.ttl=get_int16(packet+26);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_OBJECT_POS:
if (l<22)break; /* invalid packet */
{
struct object_list *p;
n=22;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.x=get_int(packet+6);
p->member.y=get_int(packet+10);
p->member.xspeed=get_int(packet+14);
p->member.yspeed=get_int(packet+18);
}
break;
case P_UPDATE_OBJECT_SPEED:
if (l<14)break; /* invalid packet */
{
struct object_list *p;
n=14;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.xspeed=get_int(packet+6);
p->member.yspeed=get_int(packet+10);
}
break;
case P_UPDATE_OBJECT_COORDS:
if (l<14)break; /* invalid packet */
{
struct object_list *p;
n=14;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.x=get_int(packet+6);
p->member.y=get_int(packet+10);
}
break;
case P_UPDATE_OBJECT_SPEED_STATUS:
if (l < (n=18))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.xspeed=get_int(packet+6);
p->member.yspeed=get_int(packet+10);
p->member.status=get_int(packet+14);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_OBJECT_COORDS_STATUS:
if (l < (n=18))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.x=get_int(packet+6);
p->member.y=get_int(packet+10);
p->member.status=get_int(packet+14);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_OBJECT_SPEED_STATUS_TTL:
if (l < (n=20))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.xspeed=get_int(packet+6);
p->member.yspeed=get_int(packet+10);
p->member.status=get_int(packet+14);
p->member.ttl=get_int16(packet+18);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_OBJECT_COORDS_STATUS_TTL:
if (l < (n=20))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break;
if(packet[5]-(p->member.update_counter)>127)break; /* throw out old updates */
p->member.update_counter=packet[5];
p->member.x=get_int(packet+6);
p->member.y=get_int(packet+10);
p->member.status=get_int(packet+14);
p->member.ttl=get_int16(packet+18);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_STATUS:
if (l < (n=9))break; /* invalid packet */
{
struct object_list *p;
p=find_in_table(get_int(packet+1));
if (!p)break; /* ignore objects we don't have */
p->member.status=get_int(packet+5);
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_HIT:
if (l<8)break; /* invalid packet */
{
struct object_list *p;
n=8;
p=find_in_table(get_int(packet+1));
if (!p)break; /* ignore objects we don't have */
p->member.status |= S_HIT;
p->member.data=(void*)(long)((packet[5]<<16)+(packet[7]<<8)+(packet[6]));
/* kdyz tasi, tak se nahodi ttl */
if (p->member.type==T_PLAYER&&(p->member.status & S_HOLDING)&&(p->member.status & S_SHOOTING))
p->member.ttl=weapon[current_weapon].cadence+HOLD_GUN_AFTER_SHOOT;
}
break;
case P_UPDATE_PLAYER:
if (l<15+2*ARMS)break; /* invalid packet */
health=packet[1];
armor=packet[2];
for (a=0;a<ARMS;a++)
ammo[a]=get_int16(packet+3+(a<<1));
frags=get_int(packet+3+ARMS*2);
deaths=get_int(packet+7+ARMS*2);
current_weapon=get_int16(packet+11+2*ARMS);
weapons=get_int16(packet+13+2*ARMS);
n=15+2*ARMS;
break;
case P_MESSAGE:
if (l < 3)
break; /* invalid packet */
n = 3 + strlen(packet + 2);
break;
case P_END:
if (l<2)printf("Game terminated.\n");
else printf("Game terminated by %s.\n",packet+1);
n=2+strlen(packet+1);
shut_down(1);
[[fallthrough]];
case P_INFO:
if (l<=5)break;
l=6;
for (a=0;a<packet[5]&&a<TOP_PLAYERS_N;a++)
{
int x;
x=strlen(packet+l+9)+1;
l+=x+9;
}
n=l;
break;
case P_EXPLODE_GRENADE:
case P_EXPLODE_BFG:
{
unsigned int i,j;
struct object_list *p;
int b;
if (l<9)break;
n=9;
i=get_int(packet+1);
j=get_int(packet+5);
p=find_in_table(j);
if (!p)break;
for (b=0;b<N_SHRAPNELS_EXPLODE;b++)
{
double angle=(double)b*2*M_PI/N_SHRAPNELS_EXPLODE;
int spd=add_int(mul_int(my_and(mul_int(weapon[WEAPON_GRENADE].speed,b+1),15),16),100);
new_obj(
i,
T_SHRAPNEL,
SHRAPNEL_TTL,
0,
0,
WEAPON_GRENADE,
p->member.x,
p->member.y,
p->member.xspeed+mul(spd,float2double(cos(angle))),
p->member.yspeed+mul(spd,float2double(sin(angle))),
0);
i++;
}
delete_obj(j);
}
break;
case P_CHANGE_LEVEL:
{
char *md5;
int a;
char p;
if (l<38)break; /* invalid packet */
a=get_int(packet+1);
if (level_number==a)goto level_changed;
level_number=a;
md5=md5_level(level_number);
if (strcmp((char *)md5,packet+5)) /* MD5s differ */
{
mem_free(md5);
ERROR("Invalid MD5 sum. Can't change level. Exiting...");
send_quit();
shut_down(1);
}
mem_free(md5);
/* OK we can change it */
change_level();
level_changed:
p=P_LEVEL_ACCEPTED;
send_packet(&p,1,(struct sockaddr *)(&server),my_id,0);
n=38;
}
break;
}
return n;
}
/* read packet from socket */
static void read_data(void)
{
fd_set rfds;
struct timeval tv;
struct sockaddr_in client;
static char packet[MAX_PACKET_LENGTH];
int a=sizeof(client);
int l;
tv.tv_sec=0;
tv.tv_usec=0;
FD_ZERO(&rfds);
FD_SET(fd,&rfds);
while(select(fd+1,&rfds,0,0,&tv))
{
if ((l=recv_packet(packet,MAX_PACKET_LENGTH,(struct sockaddr*)(&client),&a,1,my_id,0))<0)
return; /* something's strange */
process_packet(packet,l);
}
}
/* handle fatal signal (sigabrt, sigsegv, ...) */
static void signal_handler(int signum)
{
if (connected)send_quit();
shut_down(0);
clear_memory();