ttt/ttt-client.c

   1 /**************\r
   2 * Name:         ttt-client.c\r
   3 * Author:       Jan Vales (e0726236@student.tuwien.ac.at)\r
   4 * Date:         3.12.2009\r
   5 * Purpose:      Gameclient. Handles userinput.\r
   6 * Usage:        ttt-client\r
   7 **************/\r
   8 \r
   9 \r
  10 #include "globals.h"\r
  11 \r
  12 static int nSharedMemID = -1; /* ID for shared memory */\r
  13 static int semIDa = -1; /* semaphore 1 ID */\r
  14 static int semIDb = -1; /* semaphore 2 ID */\r
  15 static sharedmem_t *pSharedMem = (sharedmem_t *) -1;  /* pointer on sharedmem_t */\r
  16 \r
  17 char *szCommand = "";\r
  18 void bailOut(); /* Forward declaration */\r
  19 \r
  20 \r
  21 /* prints error messages if an error has occoured */\r
  22 void bailOut(char *szMessage) {\r
  23     if(errno!=0) {\r
  24         (void)fprintf(stderr,"%s: %s - %s\n", szCommand,szMessage,strerror(errno));\r
  25     }else{\r
  26         (void)fprintf(stderr,"%s: %s\n", szCommand,szMessage);\r
  27     }\r
  28     exit(EXIT_FAILURE);\r
  29 }\r
  30 \r
  31 /* handles signals */\r
  32 void handler(int nSignal) {\r
  33     exit(EXIT_SUCCESS);\r
  34 }\r
  35 \r
  36 \r
  37 \r
  38 /* Game stuff starts here */\r
  39 \r
  40 void restartGame(){\r
  41         int i,j;\r
  42         (void) fprintf(stdout,"Ursprüngliches Feld\n");\r
  43         for(i=0; i < 3; i++) {\r
  44                 (void) fprintf(stdout,"%c, %c, %c\n", pSharedMem->field[i][0], pSharedMem->field[i][1],pSharedMem->field[i][2]);\r
  45         }\r
  46         for(i=0;i<3;i++) {\r
  47                 for(j=0;j<3;j++) {\r
  48                         pSharedMem->field[i][j]=0;\r
  49                 }\r
  50         }\r
  51         (void) fprintf(stdout,"Feld zurückgesetzt\n");\r
  52         pSharedMem->status = -1;\r
  53 }\r
  54 \r
  55 int main(int argc, char **argv) {\r
  56         char line[MAX_CHAR] = "";\r
  57         int i;\r
  58         szCommand = argv[0];\r
  59 \r
  60         if(argc > 1){\r
  61                 (void) fprintf(stderr,"USAGE: %s\n", szCommand);\r
  62                 exit(EXIT_FAILURE);\r
  63         }\r
  64 \r
  65         /* INIT SEM + SHM*/     \r
  66         if ((nSharedMemID = shmget(SHM_KEY,sizeof(sharedmem_t),PERM))==-1) {\r
  67                 bailOut("Konnte nicht zum Server verbinden!");\r
  68         }\r
  69         if ((pSharedMem = (sharedmem_t *) shmat(nSharedMemID,(const void *) 0,0))==(sharedmem_t *) -1) {\r
  70                 bailOut("Konnte nicht zum Server verbinden!");\r
  71         }\r
  72         if ((semIDa=semgrab(SEM_KEY_A))==-1) {\r
  73                 bailOut("Konnte nicht zum Server verbinden!");\r
  74         }\r
  75         if ((semIDb=semgrab(SEM_KEY_B))==-1) {\r
  76                 bailOut("Konnte nicht zum Server verbinden!");\r
  77         }\r
  78 \r
  79         /* register handler */\r
  80         (void) signal(SIGINT, handler);\r
  81         (void) signal(SIGTERM, handler);\r
  82         (void) signal(SIGQUIT, handler);\r
  83 \r
  84         /* the game routine */\r
  85         (void) fprintf(stderr,"Connected to server. idle.\n");\r
  86 \r
  87         while(1) {\r
  88                 if((P(semIDa))==-1)bailOut("Could not P semaphoreA");\r
  89                 switch(pSharedMem->status) {\r
  90                         case 0:\r
  91                                 fprintf(stdout,"Du bist am zug!\n");\r
  92                                 for(i=0; i < 3; i++) {\r
  93                                         fprintf(stdout,"%c, %c, %c\n", pSharedMem->field[i][0], pSharedMem->field[i][1],pSharedMem->field[i][2]);\r
  94                                 }\r
  95                                 break;\r
  96                         case -1:\r
  97                                 fprintf(stdout,"Wegen des cheatens wurde des Spiel neu gestartet!\n");\r
  98                                 restartGame();\r
  99                                 break;\r
 100                         case 2:\r
 101                                 fprintf(stdout,"Du hast gewonnen!\n");\r
 102                                 restartGame();\r
 103                                 break;\r
 104                         case 3:\r
 105                                 fprintf(stdout,"Server hat gewonnen!\n");\r
 106                                 restartGame();\r
 107                                 break;\r
 108                         case 4:\r
 109                                 fprintf(stdout,"Unentsschieden!\n");\r
 110                                 restartGame();\r
 111                                 break;\r
 112                 }\r
 113                 fgets(line,MAX_CHAR-1,stdin);\r
 114                 if(ferror(stdin))bailOut("Error: while reading from stdin!\n");\r
 115                 switch(line[0]) {\r
 116                         case 's': \r
 117                                 for(i=0; i < 3; i++) {\r
 118                                         fprintf(stdout,"%c, %c, %c\n", pSharedMem->field[i][0], pSharedMem->field[i][1],pSharedMem->field[i][2]);\r
 119                                 }\r
 120                                 break;\r
 121 \r
 122                         case 'p':\r
 123                                 if((line[2]<49) | (line[2]>51) | (line[3]<49) | (line[3]>51)){\r
 124                                         (void) fprintf(stdout,"Ungültige eingabe Werte 1-3 eingeben!\n");\r
 125                                         break;\r
 126                                 }\r
 127                                 if(pSharedMem->field[(line[2]-49)][(line[3]-49)] == 0){\r
 128                                         pSharedMem->field[(line[2]-49)][(line[3]-49)]='X';\r
 129                                         pSharedMem->status = 1;\r
 130                                 }else{\r
 131                                         (void) fprintf(stdout,"Feld belegt!\n");\r
 132                                 }\r
 133                                 break;\r
 134                         case 'c':\r
 135                                 if((line[2]<49) | (line[2]>51) | (line[3]<49) | (line[3]>51) | (line[5]<49) | (line[5]>51) | (line[6]<49) | (line[6]>51)){\r
 136                                         (void) fprintf(stdout,"Ungültige eingabe Werte 1-3 eingeben!\n");\r
 137                                         break;\r
 138                                 }\r
 139                                 if((pSharedMem->field[(line[2]-49)][(line[3]-49)] == 0) & (pSharedMem->field[(line[5]-49)][(line[6]-49)] == 0)){\r
 140                                         pSharedMem->field[(line[2]-49)][(line[3]-49)]='X';\r
 141                                         pSharedMem->field[(line[5]-49)][(line[6]-49)]='X';\r
 142                                         pSharedMem->status = 1;\r
 143                                 }else{\r
 144                                         (void) fprintf(stdout,"Mindestens 1 Feld belegt!\n");\r
 145                                 }\r
 146                                 break;\r
 147                         case 'n':\r
 148                                 restartGame();\r
 149                                 break;\r
 150                         case 'q':\r
 151                                 if((V(semIDb))==-1)bailOut("Can not V semaphoreB\n");\r
 152                                 exit (EXIT_SUCCESS);\r
 153                         default: printf("befehl nicht erkannt\n");\r
 154                         case 'h':\r
 155                                 printf("s - Spielfeld anzeigen (dies wird nach jedem Zug automatisch gemacht)\n");\r
 156                                 printf("p <xy> - Symbol platzieren auf Position xy (wobei (1,1) die Ecke links oben bezeichnet\n");\r
 157                                 printf("c <xy> <xy> - zwei Symbole platzieren (Cheat-Modus)\n");\r
 158                                 printf("n - Neues Spiel starten\n");\r
 159                                 printf("q - Spiel beenden (Position bleibt weiterhin bestehen!)\n");\r
 160                 }\r
 161                 if((V(semIDb))==-1)bailOut("Can not V semaphoreB");\r
 162         }\r
 163         /* return 1337 for the guy who reached this impossible state!*/\r
 164         return 1337; \r
 165 }\r
 166 \r