games/larn/tok.c

   1 /* tok.c                Larn is copyrighted 1986 by Noah Morgan. */
   2 /* $FreeBSD: src/games/larn/tok.c,v 1.5 1999/11/16 02:57:25 billf Exp $ */
   3 /* $DragonFly: src/games/larn/tok.c,v 1.5 2006/10/08 17:11:30 pavalos Exp $ */
   4 #include <sys/types.h>
   5 #include <sys/ioctl.h>
   6 #include <sys/wait.h>
   7 #include "header.h"
   8
   9 /* Keystrokes (roughly) between checkpoints */
  10 #define CHECKPOINT_INTERVAL     400
  11
  12 static char lastok = 0;
  13 int yrepcount = 0, dayplay = 0;
  14 #ifndef FLUSHNO
  15 #define FLUSHNO 5
  16 #endif /* FLUSHNO */
  17 static int flushno = FLUSHNO;   /* input queue flushing threshold */
  18 #define MAXUM 52                /* maximum number of user re-named monsters */
  19 #define MAXMNAME 40             /* max length of a monster re-name */
  20 static char usermonster[MAXUM][MAXMNAME];       /* the user named monster name goes here */
  21 static char usermpoint = 0;     /* the user monster pointer */
  22
  23 /*
  24         lexical analyzer for larn
  25  */
  26 int
  27 yylex(void)
  28 {
  29         char cc;
  30         int ic;
  31         if (hit2flag) {
  32                 hit2flag = 0;
  33                 yrepcount = 0;
  34                 return (' ');
  35         }
  36         if (yrepcount > 0) {
  37                 --yrepcount;
  38                 return (lastok);
  39         } else
  40                 yrepcount = 0;
  41         if (yrepcount == 0) {
  42                 bottomdo();
  43                 showplayer();
  44         }                       /* show where the player is */
  45         lflush();
  46         while (1) {
  47                 c[BYTESIN]++;
  48                 /* check for periodic checkpointing */
  49                 if (ckpflag)
  50                         if ((c[BYTESIN] % CHECKPOINT_INTERVAL) == 0) {
  51 #ifndef DOCHECKPOINTS
  52                                 savegame(ckpfile);
  53 #else
  54                                 wait(0);        /* wait for other forks to finish */
  55                                 if (fork() == 0) {
  56                                         savegame(ckpfile);
  57                                         exit(0);
  58                                 }
  59 #endif
  60 #ifdef TIMECHECK
  61                                 if (dayplay == 0)
  62                                         if (playable()) {
  63                                                 cursor(1, 19);
  64                                                 lprcat("\nSorry, but it is now time for work.  Your game has been saved.\n");
  65                                                 beep();
  66                                                 lflush();
  67                                                 savegame(savefilename);
  68                                                 wizard = nomove = 1;
  69                                                 sleep(4);
  70                                                 died(-257);
  71                                         }
  72 #endif /* TIMECHECK */
  73                         }
  74
  75                 do {            /* if keyboard input buffer is too big, flush some of it */
  76                         ioctl(0, FIONREAD, &ic);
  77                         if (ic > flushno)
  78                                 read(0, &cc, 1);
  79                 } while (ic > flushno);
  80
  81                 if (read(0, &cc, 1) != 1)
  82                         return (lastok = -1);
  83
  84                 if (cc == 'Y' - 64) {   /* control Y -- shell escape */
  85                         resetscroll();
  86                         clear();        /* scrolling region, home, clear, no attributes */
  87                         if ((ic = fork()) == 0) {       /* child */
  88                                 /* revoke */
  89                                 setgid(getgid());
  90                                 execl("/bin/csh", "csh", NULL);
  91                                 exit(1);
  92                         }
  93                         wait(0);
  94                         if (ic < 0) {   /* error */
  95                                 write(2, "Can't fork off a shell!\n", 25);
  96                                 sleep(2);
  97                         }
  98
  99                         setscroll();
 100                         return (lastok = 'L' - 64);     /* redisplay screen */
 101                 }
 102
 103                 if ((cc <= '9') && (cc >= '0')) {
 104                         yrepcount = yrepcount * 10 + cc - '0';
 105                 } else {
 106                         if (yrepcount > 0)
 107                                 --yrepcount;
 108                         return (lastok = cc);
 109                 }
 110         }
 111 }
 112
 113 /*
 114  *      flushall()              Function to flush all type-ahead in the input buffer
 115  */
 116 void
 117 flushall(void)
 118 {
 119         char cc;
 120         int ic;
 121         for (;;) {              /* if keyboard input buffer is too big, flush some of it */
 122                 ioctl(0, FIONREAD, &ic);
 123                 if (ic <= 0)
 124                         return;
 125                 while (ic > 0) {
 126                         read(0, &cc, 1);
 127                         --ic;
 128                 }               /* gobble up the byte */
 129         }
 130 }
 131
 132 /*
 133         function to set the desired hardness
 134         enter with hard= -1 for default hardness, else any desired hardness
 135  */
 136 void
 137 sethard(int hard)
 138 {
 139         int j, k, i;
 140         j = c[HARDGAME];
 141         hashewon();
 142         if (restorflag == 0) {  /* don't set c[HARDGAME] if restoring game */
 143                 if (hard >= 0)
 144                         c[HARDGAME] = hard;
 145         } else
 146                 c[HARDGAME] = j;        /* set c[HARDGAME] to proper value if restoring game */
 147
 148         if ((k = c[HARDGAME]) != 0)
 149                 for (j = 0; j <= MAXMONST + 8; j++) {
 150                         i = ((6 + k) * monster[j].hitpoints + 1) / 6;
 151                         monster[j].hitpoints = (i < 0) ? 32767 : i;
 152                         i = ((6 + k) * monster[j].damage + 1) / 5;
 153                         monster[j].damage = (i > 127) ? 127 : i;
 154                         i = (10 * monster[j].gold) / (10 + k);
 155                         monster[j].gold = (i > 32767) ? 32767 : i;
 156                         i = monster[j].armorclass - k;
 157                         monster[j].armorclass = (i < -127) ? -127 : i;
 158                         i = (7 * monster[j].experience) / (7 + k) + 1;
 159                         monster[j].experience = (i <= 0) ? 1 : i;
 160                 }
 161 }
 162
 163 /*
 164         function to read and process the larn options file
 165  */
 166 void
 167 readopts(void)
 168 {
 169         char *i;
 170         int j, k;
 171         int flag;
 172
 173         flag = 1;               /* set to 0 if a name is specified */
 174         if (lopen(optsfile) < 0) {
 175                 strcpy(logname, loginname);
 176                 return;                            /* user name if no character name */
 177         }
 178         do {
 179                 if ((i = (char *)lgetw()) == 0)
 180                         break;  /* check for EOF */
 181                 while ((*i == ' ') || (*i == '\t'))
 182                         i++;    /* eat leading whitespace */
 183                 switch (*i) {
 184                 case 'b':
 185                         if (strcmp(i, "bold-objects") == 0)
 186                                 boldon = 1;
 187                         break;
 188
 189                 case 'e':
 190                         if (strcmp(i, "enable-checkpointing") == 0)
 191                                 ckpflag = 1;
 192                         break;
 193
 194                 case 'i':
 195                         if (strcmp(i, "inverse-objects") == 0)
 196                                 boldon = 0;
 197                         break;
 198
 199                 case 'f':
 200                         if (strcmp(i, "female") == 0)
 201                                 sex = 0;        /* male or female */
 202                         break;
 203
 204                 case 'm':
 205                         if (strcmp(i, "monster:") == 0) {       /* name favorite monster */
 206                                 if ((i = lgetw()) == 0)
 207                                         break;
 208                                 if (strlen(i) >= MAXMNAME)
 209                                         i[MAXMNAME - 1] = 0;
 210                                 strcpy(usermonster[(int)usermpoint], i);
 211                                 if (usermpoint >= MAXUM)
 212                                         break;          /* defined all of em */
 213                                 if (isalpha(j = usermonster[(int)usermpoint][0])) {
 214                                         for (k = 1; k < MAXMONST + 8; k++)      /* find monster */
 215                                                 if (monstnamelist[k] == j) {
 216                                                         monster[k].name = &usermonster[(int)usermpoint++][0];
 217                                                         break;
 218                                                 }
 219                                 }
 220                         } else if (strcmp(i, "male") == 0)
 221                                 sex = 1;
 222                         break;
 223
 224                 case 'n':
 225                         if (strcmp(i, "name:") == 0) {  /* defining players name */
 226                                 if ((i = lgetw()) == 0)
 227                                         break;
 228                                 if (strlen(i) >= LOGNAMESIZE) i[LOGNAMESIZE - 1] = 0;
 229                                 strcpy(logname, i);
 230                                 flag = 0;
 231                         } else if (strcmp(i, "no-introduction") == 0)
 232                                 nowelcome = 1;
 233                         else if (strcmp(i, "no-beep") == 0)
 234                                 nobeep = 1;
 235                         break;
 236
 237                 case 'p':
 238                         if (strcmp(i, "process-name:") == 0) {
 239                                 if ((i = lgetw()) == 0)
 240                                         break;
 241                                 if (strlen(i) >= PSNAMESIZE)
 242                                         i[PSNAMESIZE - 1] = 0;
 243                                 strcpy(psname, i);
 244                         } else if (strcmp(i, "play-day-play") == 0)
 245                                 dayplay = 1;
 246                         break;
 247
 248                 case 's':
 249                         if (strcmp(i, "savefile:") == 0) {      /* defining savefilename */
 250                                 if ((i = lgetw()) == 0)
 251                                         break;
 252                                 strcpy(savefilename, i);
 253                                 flag = 0;
 254                         }
 255                         break;
 256                 }
 257         } while (*i);
 258         if (flag)
 259                 strcpy(logname, loginname);
 260 }