games/fortune/fortune/fortune.c

   1 /*-
   2  * Copyright (c) 1986, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Ken Arnold.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1986, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)fortune.c   8.1 (Berkeley) 5/31/93
  38  * $FreeBSD: src/games/fortune/fortune/fortune.c,v 1.18.2.1 2001/07/02 00:35:27 dd Exp $
  39  */
  40 /* $FreeBSD: src/games/fortune/fortune/fortune.c,v 1.18.2.1 2001/07/02 00:35:27 dd Exp $ */
  41 /* $DragonFly: src/games/fortune/fortune/fortune.c,v 1.6 2006/08/08 16:58:59 pavalos Exp $ */
  42
  43 # include       <sys/param.h>
  44 # include       <sys/stat.h>
  45
  46 # include       <dirent.h>
  47 # include       <err.h>
  48 # include       <fcntl.h>
  49 # include       <assert.h>
  50 # include       <unistd.h>
  51 # include       <stdbool.h>
  52 # include       <stdio.h>
  53 # include       <ctype.h>
  54 # include       <stdlib.h>
  55 # include       <string.h>
  56 # include       <locale.h>
  57 # include       <time.h>
  58 # include       "strfile.h"
  59 # include       "pathnames.h"
  60
  61 # define        MINW    6               /* minimum wait if desired */
  62 # define        CPERS   20              /* # of chars for each sec */
  63 # define        SLEN    160             /* # of chars in short fortune */
  64
  65 # define        POS_UNKNOWN     ((long) -1)     /* pos for file unknown */
  66 # define        NO_PROB         (-1)            /* no prob specified for file */
  67
  68 # ifdef DEBUG
  69 # define        DPRINTF(l,x)    { if (Debug >= l) fprintf x; }
  70 # undef         NDEBUG
  71 # else
  72 # define        DPRINTF(l,x)
  73 # define        NDEBUG  1
  74 # endif
  75
  76 typedef struct fd {
  77         int             percent;
  78         int             fd, datfd;
  79         long            pos;
  80         FILE            *inf;
  81         const char      *name;
  82         const char      *path;
  83         char            *datfile, *posfile;
  84         bool            read_tbl;
  85         bool            was_pos_file;
  86         STRFILE         tbl;
  87         int             num_children;
  88         struct fd       *child, *parent;
  89         struct fd       *next, *prev;
  90 } FILEDESC;
  91
  92 bool    Found_one;                      /* did we find a match? */
  93 bool    Find_files      = false;        /* just find a list of proper fortune files */
  94 bool    Fortunes_only   = false;        /* check only "fortunes" files */
  95 bool    Wait            = false;        /* wait desired after fortune */
  96 bool    Short_only      = false;        /* short fortune desired */
  97 bool    Long_only       = false;        /* long fortune desired */
  98 bool    Offend          = false;        /* offensive fortunes only */
  99 bool    All_forts       = false;        /* any fortune allowed */
 100 bool    Equal_probs     = false;        /* scatter un-allocted prob equally */
 101 #ifndef NO_REGEX
 102 bool    Match           = false;        /* dump fortunes matching a pattern */
 103 #endif
 104 #ifdef DEBUG
 105 bool    Debug = false;                  /* print debug messages */
 106 #endif
 107
 108 char    *Fortbuf = NULL;                        /* fortune buffer for -m */
 109
 110 int     Fort_len = 0;
 111
 112 long    Seekpts[2];                     /* seek pointers to fortunes */
 113
 114 FILEDESC        *File_list = NULL,      /* Head of file list */
 115                 *File_tail = NULL;      /* Tail of file list */
 116 FILEDESC        *Fortfile;              /* Fortune file to use */
 117
 118 STRFILE         Noprob_tbl;             /* sum of data for all no prob files */
 119
 120 bool     add_dir (FILEDESC *);
 121 bool     add_file (int,
 122             const char *, const char *, FILEDESC **, FILEDESC **, FILEDESC *);
 123 void     all_forts (FILEDESC *, char *);
 124 char    *copy (const char *, u_int);
 125 void     display (FILEDESC *);
 126 void     do_free (void *);
 127 void    *do_malloc (u_int);
 128 bool     form_file_list (char **, int);
 129 int      fortlen (void);
 130 void     get_fort (void);
 131 void     get_pos (FILEDESC *);
 132 void     get_tbl (FILEDESC *);
 133 void     getargs (int, char *[]);
 134 void     init_prob (void);
 135 bool     is_dir (const char *);
 136 bool     is_fortfile (const char *, char **, char **, int);
 137 bool     is_off_name (const char *);
 138 int      max (int, int);
 139 FILEDESC *
 140          new_fp (void);
 141 char    *off_name (const char *);
 142 void     open_dat (FILEDESC *);
 143 void     open_fp (FILEDESC *);
 144 FILEDESC *
 145          pick_child (FILEDESC *);
 146 void     print_file_list (void);
 147 void     print_list (FILEDESC *, int);
 148 void     sum_noprobs (FILEDESC *);
 149 void     sum_tbl (STRFILE *, STRFILE *);
 150 void     usage (void);
 151 void     zero_tbl (STRFILE *);
 152
 153 #ifndef NO_REGEX
 154 char    *conv_pat (char *);
 155 int      find_matches (void);
 156 void     matches_in_list (FILEDESC *);
 157 int      maxlen_in_list (FILEDESC *);
 158 #endif
 159
 160 #ifndef NO_REGEX
 161 #ifdef REGCMP
 162 # define        RE_COMP(p)      (Re_pat = regcmp(p, NULL))
 163 # define        BAD_COMP(f)     ((f) == NULL)
 164 # define        RE_EXEC(p)      regex(Re_pat, (p))
 165
 166 char    *Re_pat;
 167
 168 char    *regcmp(), *regex();
 169 #else
 170 # define        RE_COMP(p)      (p = re_comp(p))
 171 # define        BAD_COMP(f)     ((f) != NULL)
 172 # define        RE_EXEC(p)      re_exec(p)
 173
 174 #endif
 175 #endif
 176
 177 int
 178 main(int ac, char **av)
 179 {
 180 #ifdef  OK_TO_WRITE_DISK
 181         int     fd;
 182 #endif  /* OK_TO_WRITE_DISK */
 183
 184         (void) setlocale(LC_ALL, "");
 185
 186         getargs(ac, av);
 187
 188 #ifndef NO_REGEX
 189         if (Match)
 190                 exit(find_matches() != 0);
 191 #endif
 192
 193         init_prob();
 194         srandomdev();
 195         do {
 196                 get_fort();
 197         } while ((Short_only && fortlen() > SLEN) ||
 198                  (Long_only && fortlen() <= SLEN));
 199
 200         display(Fortfile);
 201
 202 #ifdef  OK_TO_WRITE_DISK
 203         if ((fd = creat(Fortfile->posfile, 0666)) < 0) {
 204                 perror(Fortfile->posfile);
 205                 exit(1);
 206         }
 207 #ifdef  LOCK_EX
 208         /*
 209          * if we can, we exclusive lock, but since it isn't very
 210          * important, we just punt if we don't have easy locking
 211          * available.
 212          */
 213         (void) flock(fd, LOCK_EX);
 214 #endif  /* LOCK_EX */
 215         write(fd, (char *) &Fortfile->pos, sizeof Fortfile->pos);
 216         if (!Fortfile->was_pos_file)
 217                 (void) chmod(Fortfile->path, 0666);
 218 #ifdef  LOCK_EX
 219         (void) flock(fd, LOCK_UN);
 220 #endif  /* LOCK_EX */
 221 #endif  /* OK_TO_WRITE_DISK */
 222         if (Wait) {
 223                 if (Fort_len == 0)
 224                         (void) fortlen();
 225                 sleep((unsigned int) max(Fort_len / CPERS, MINW));
 226         }
 227         exit(0);
 228         /* NOTREACHED */
 229 }
 230
 231 void
 232 display(FILEDESC *fp)
 233 {
 234         char   *p;
 235         unsigned char ch;
 236         char    line[BUFSIZ];
 237
 238         open_fp(fp);
 239         (void) fseek(fp->inf, Seekpts[0], 0);
 240         for (Fort_len = 0; fgets(line, sizeof line, fp->inf) != NULL &&
 241             !STR_ENDSTRING(line, fp->tbl); Fort_len++) {
 242                 if (fp->tbl.str_flags & STR_ROTATED)
 243                         for (p = line; (ch = *p) != '\0'; ++p) {
 244                                 if (isascii(ch)) {
 245                                         if (isupper(ch))
 246                                                 *p = 'A' + (ch - 'A' + 13) % 26;
 247                                         else if (islower(ch))
 248                                                 *p = 'a' + (ch - 'a' + 13) % 26;
 249                                 }
 250                         }
 251                 if (fp->tbl.str_flags & STR_COMMENTS
 252                     && line[0] == fp->tbl.str_delim
 253                     && line[1] == fp->tbl.str_delim)
 254                         continue;
 255                 fputs(line, stdout);
 256         }
 257         (void) fflush(stdout);
 258 }
 259
 260 /*
 261  * fortlen:
 262  *      Return the length of the fortune.
 263  */
 264 int
 265 fortlen(void)
 266 {
 267         int     nchar;
 268         char            line[BUFSIZ];
 269
 270         if (!(Fortfile->tbl.str_flags & (STR_RANDOM | STR_ORDERED)))
 271                 nchar = (Seekpts[1] - Seekpts[0] <= SLEN);
 272         else {
 273                 open_fp(Fortfile);
 274                 (void) fseek(Fortfile->inf, Seekpts[0], 0);
 275                 nchar = 0;
 276                 while (fgets(line, sizeof line, Fortfile->inf) != NULL &&
 277                        !STR_ENDSTRING(line, Fortfile->tbl))
 278                         nchar += strlen(line);
 279         }
 280         Fort_len = nchar;
 281         return nchar;
 282 }
 283
 284 /*
 285  *      This routine evaluates the arguments on the command line
 286  */
 287 void
 288 getargs(int argc, char **argv)
 289 {
 290         int     ignore_case;
 291 # ifndef NO_REGEX
 292         char    *pat;
 293 # endif /* NO_REGEX */
 294         int ch;
 295
 296         ignore_case = false;
 297 # ifndef NO_REGEX
 298         pat = NULL;
 299 # endif /* NO_REGEX */
 300
 301 # ifdef DEBUG
 302         while ((ch = getopt(argc, argv, "aDefilm:osw")) != -1)
 303 #else
 304         while ((ch = getopt(argc, argv, "aefilm:osw")) != -1)
 305 #endif /* DEBUG */
 306                 switch(ch) {
 307                 case 'a':               /* any fortune */
 308                         All_forts++;
 309                         break;
 310 # ifdef DEBUG
 311                 case 'D':
 312                         Debug++;
 313                         break;
 314 # endif /* DEBUG */
 315                 case 'e':
 316                         Equal_probs++;  /* scatter un-allocted prob equally */
 317                         break;
 318                 case 'f':               /* find fortune files */
 319                         Find_files++;
 320                         break;
 321                 case 'l':               /* long ones only */
 322                         Long_only++;
 323                         Short_only = false;
 324                         break;
 325                 case 'o':               /* offensive ones only */
 326                         Offend++;
 327                         break;
 328                 case 's':               /* short ones only */
 329                         Short_only++;
 330                         Long_only = false;
 331                         break;
 332                 case 'w':               /* give time to read */
 333                         Wait++;
 334                         break;
 335 # ifdef NO_REGEX
 336                 case 'i':                       /* case-insensitive match */
 337                 case 'm':                       /* dump out the fortunes */
 338                         (void) fprintf(stderr,
 339                             "fortune: can't match fortunes on this system (Sorry)\n");
 340                         exit(0);
 341 # else  /* NO_REGEX */
 342                 case 'm':                       /* dump out the fortunes */
 343                         Match++;
 344                         pat = optarg;
 345                         break;
 346                 case 'i':                       /* case-insensitive match */
 347                         ignore_case++;
 348                         break;
 349 # endif /* NO_REGEX */
 350                 case '?':
 351                 default:
 352                         usage();
 353                 }
 354         argc -= optind;
 355         argv += optind;
 356
 357         if (!form_file_list(argv, argc))
 358                 exit(1);        /* errors printed through form_file_list() */
 359         if (Find_files) {
 360                 print_file_list();
 361                 exit(0);
 362         }
 363 #ifdef DEBUG
 364         else if (Debug >= 1)
 365                 print_file_list();
 366 #endif /* DEBUG */
 367
 368 # ifndef NO_REGEX
 369         if (pat != NULL) {
 370                 if (ignore_case)
 371                         pat = conv_pat(pat);
 372                 if (BAD_COMP(RE_COMP(pat))) {
 373 #ifndef REGCMP
 374                         fprintf(stderr, "%s\n", pat);
 375 #else   /* REGCMP */
 376                         fprintf(stderr, "bad pattern: %s\n", pat);
 377 #endif  /* REGCMP */
 378                 }
 379         }
 380 # endif /* NO_REGEX */
 381 }
 382
 383 /*
 384  * form_file_list:
 385  *      Form the file list from the file specifications.
 386  */
 387 bool
 388 form_file_list(char **files, int file_cnt)
 389 {
 390         bool    i;
 391         int     percent;
 392         const char      *sp;
 393
 394         if (file_cnt == 0) {
 395                 if (Find_files) {
 396                         Fortunes_only = true;
 397                         i = add_file(NO_PROB, FORTDIR, NULL, &File_list,
 398                                         &File_tail, NULL);
 399                         Fortunes_only = false;
 400                         return i;
 401                 } else
 402                         return add_file(NO_PROB, "fortunes", FORTDIR,
 403                                         &File_list, &File_tail, NULL);
 404         }
 405         for (i = 0; i < file_cnt; i++) {
 406                 percent = NO_PROB;
 407                 if (!isdigit((unsigned char)files[i][0]))
 408                         sp = files[i];
 409                 else {
 410                         percent = 0;
 411                         for (sp = files[i]; isdigit((unsigned char)*sp); sp++)
 412                                 percent = percent * 10 + *sp - '0';
 413                         if (percent > 100) {
 414                                 fprintf(stderr, "percentages must be <= 100\n");
 415                                 return false;
 416                         }
 417                         if (*sp == '.') {
 418                                 fprintf(stderr, "percentages must be integers\n");
 419                                 return false;
 420                         }
 421                         /*
 422                          * If the number isn't followed by a '%', then
 423                          * it was not a percentage, just the first part
 424                          * of a file name which starts with digits.
 425                          */
 426                         if (*sp != '%') {
 427                                 percent = NO_PROB;
 428                                 sp = files[i];
 429                         }
 430                         else if (*++sp == '\0') {
 431                                 if (++i >= file_cnt) {
 432                                         fprintf(stderr, "percentages must precede files\n");
 433                                         return false;
 434                                 }
 435                                 sp = files[i];
 436                         }
 437                 }
 438                 if (strcmp(sp, "all") == 0)
 439                         sp = FORTDIR;
 440                 if (!add_file(percent, sp, NULL, &File_list, &File_tail, NULL))
 441                         return false;
 442         }
 443         return true;
 444 }
 445
 446 /*
 447  * add_file:
 448  *      Add a file to the file list.
 449  */
 450 bool
 451 add_file(int percent, const char *file, const char *dir, FILEDESC **head, FILEDESC **tail, FILEDESC *parent)
 452 {
 453         FILEDESC        *fp;
 454         int             fd;
 455         const char      *path;
 456         char            *tpath, *offensive;
 457         bool            was_malloc;
 458         bool            isdir;
 459
 460         if (dir == NULL) {
 461                 path = file;
 462                 tpath = NULL;
 463                 was_malloc = false;
 464         }
 465         else {
 466                 tpath = do_malloc((unsigned int) (strlen(dir) + strlen(file) + 2));
 467                 (void) strcat(strcat(strcpy(tpath, dir), "/"), file);
 468                 path = tpath;
 469                 was_malloc = true;
 470         }
 471         if ((isdir = is_dir(path)) && parent != NULL) {
 472                 if (was_malloc)
 473                         free(tpath);
 474                 return false;   /* don't recurse */
 475         }
 476         offensive = NULL;
 477         if (!isdir && parent == NULL && (All_forts || Offend) &&
 478             !is_off_name(path)) {
 479                 offensive = off_name(path);
 480                 if (Offend) {
 481                         if (was_malloc)
 482                                 free(tpath);
 483                         path = offensive;
 484                         offensive = NULL;
 485                         was_malloc = true;
 486                         DPRINTF(1, (stderr, "\ttrying \"%s\"\n", path));
 487                         file = off_name(file);
 488                 }
 489         }
 490
 491         DPRINTF(1, (stderr, "adding file \"%s\"\n", path));
 492 over:
 493         if ((fd = open(path, 0)) < 0) {
 494                 /*
 495                  * This is a sneak.  If the user said -a, and if the
 496                  * file we're given isn't a file, we check to see if
 497                  * there is a -o version.  If there is, we treat it as
 498                  * if *that* were the file given.  We only do this for
 499                  * individual files -- if we're scanning a directory,
 500                  * we'll pick up the -o file anyway.
 501                  */
 502                 if (All_forts && offensive != NULL) {
 503                         if (was_malloc)
 504                                 free(tpath);
 505                         path = offensive;
 506                         offensive = NULL;
 507                         was_malloc = true;
 508                         DPRINTF(1, (stderr, "\ttrying \"%s\"\n", path));
 509                         file = off_name(file);
 510                         goto over;
 511                 }
 512                 if (dir == NULL && file[0] != '/')
 513                         return add_file(percent, file, FORTDIR, head, tail,
 514                                         parent);
 515                 if (parent == NULL)
 516                         perror(path);
 517                 if (was_malloc)
 518                         free(tpath);
 519                 return false;
 520         }
 521
 522         DPRINTF(2, (stderr, "path = \"%s\"\n", path));
 523
 524         fp = new_fp();
 525         fp->fd = fd;
 526         fp->percent = percent;
 527         fp->name = file;
 528         fp->path = path;
 529         fp->parent = parent;
 530
 531         if ((isdir && !add_dir(fp)) ||
 532             (!isdir &&
 533              !is_fortfile(path, &fp->datfile, &fp->posfile, (parent != NULL))))
 534         {
 535                 if (parent == NULL)
 536                         fprintf(stderr,
 537                                 "fortune:%s not a fortune file or directory\n",
 538                                 path);
 539                 if (was_malloc)
 540                         free(tpath);
 541                 do_free(fp->datfile);
 542                 do_free(fp->posfile);
 543                 free((char *) fp);
 544                 do_free(offensive);
 545                 return false;
 546         }
 547         /*
 548          * If the user said -a, we need to make this node a pointer to
 549          * both files, if there are two.  We don't need to do this if
 550          * we are scanning a directory, since the scan will pick up the
 551          * -o file anyway.
 552          */
 553         if (All_forts && parent == NULL && !is_off_name(path))
 554                 all_forts(fp, offensive);
 555         if (*head == NULL)
 556                 *head = *tail = fp;
 557         else if (fp->percent == NO_PROB) {
 558                 (*tail)->next = fp;
 559                 fp->prev = *tail;
 560                 *tail = fp;
 561         }
 562         else {
 563                 (*head)->prev = fp;
 564                 fp->next = *head;
 565                 *head = fp;
 566         }
 567 #ifdef  OK_TO_WRITE_DISK
 568         fp->was_pos_file = (access(fp->posfile, W_OK) >= 0);
 569 #endif  /* OK_TO_WRITE_DISK */
 570
 571         return true;
 572 }
 573
 574 /*
 575  * new_fp:
 576  *      Return a pointer to an initialized new FILEDESC.
 577  */
 578 FILEDESC *
 579 new_fp(void)
 580 {
 581         FILEDESC        *fp;
 582
 583         fp = (FILEDESC *) do_malloc(sizeof *fp);
 584         fp->datfd = -1;
 585         fp->pos = POS_UNKNOWN;
 586         fp->inf = NULL;
 587         fp->fd = -1;
 588         fp->percent = NO_PROB;
 589         fp->read_tbl = false;
 590         fp->next = NULL;
 591         fp->prev = NULL;
 592         fp->child = NULL;
 593         fp->parent = NULL;
 594         fp->datfile = NULL;
 595         fp->posfile = NULL;
 596         return fp;
 597 }
 598
 599 /*
 600  * off_name:
 601  *      Return a pointer to the offensive version of a file of this name.
 602  */
 603 char *
 604 off_name(const char *file)
 605 {
 606         char    *new;
 607
 608         new = copy(file, (unsigned int) (strlen(file) + 2));
 609         return strcat(new, "-o");
 610 }
 611
 612 /*
 613  * is_off_name:
 614  *      Is the file an offensive-style name?
 615  */
 616 bool
 617 is_off_name(const char *file)
 618 {
 619         int     len;
 620
 621         len = strlen(file);
 622         return (len >= 3 && file[len - 2] == '-' && file[len - 1] == 'o');
 623 }
 624
 625 /*
 626  * all_forts:
 627  *      Modify a FILEDESC element to be the parent of two children if
 628  *      there are two children to be a parent of.
 629  */
 630 void
 631 all_forts(FILEDESC *fp, char *offensive)
 632 {
 633         char            *sp;
 634         FILEDESC        *scene, *obscene;
 635         int             fd;
 636         auto char               *datfile, *posfile;
 637
 638         if (fp->child != NULL)  /* this is a directory, not a file */
 639                 return;
 640         if (!is_fortfile(offensive, &datfile, &posfile, false))
 641                 return;
 642         if ((fd = open(offensive, 0)) < 0)
 643                 return;
 644         DPRINTF(1, (stderr, "adding \"%s\" because of -a\n", offensive));
 645         scene = new_fp();
 646         obscene = new_fp();
 647         *scene = *fp;
 648
 649         fp->num_children = 2;
 650         fp->child = scene;
 651         scene->next = obscene;
 652         obscene->next = NULL;
 653         scene->child = obscene->child = NULL;
 654         scene->parent = obscene->parent = fp;
 655
 656         fp->fd = -1;
 657         scene->percent = obscene->percent = NO_PROB;
 658
 659         obscene->fd = fd;
 660         obscene->inf = NULL;
 661         obscene->path = offensive;
 662         if ((sp = rindex(offensive, '/')) == NULL)
 663                 obscene->name = offensive;
 664         else
 665                 obscene->name = ++sp;
 666         obscene->datfile = datfile;
 667         obscene->posfile = posfile;
 668         obscene->read_tbl = false;
 669 #ifdef  OK_TO_WRITE_DISK
 670         obscene->was_pos_file = (access(obscene->posfile, W_OK) >= 0);
 671 #endif  /* OK_TO_WRITE_DISK */
 672 }
 673
 674 /*
 675  * add_dir:
 676  *      Add the contents of an entire directory.
 677  */
 678 bool
 679 add_dir(FILEDESC *fp)
 680 {
 681         DIR             *dir;
 682         struct dirent   *dirent;
 683         auto FILEDESC           *tailp;
 684         auto char               *name;
 685
 686         (void) close(fp->fd);
 687         fp->fd = -1;
 688         if ((dir = opendir(fp->path)) == NULL) {
 689                 perror(fp->path);
 690                 return false;
 691         }
 692         tailp = NULL;
 693         DPRINTF(1, (stderr, "adding dir \"%s\"\n", fp->path));
 694         fp->num_children = 0;
 695         while ((dirent = readdir(dir)) != NULL) {
 696                 if ((name = strdup(dirent->d_name)) == NULL)
 697                         err(1, "strdup failed");
 698                 if (add_file(NO_PROB, name, fp->path, &fp->child, &tailp, fp))
 699                         fp->num_children++;
 700                 else
 701                         free(name);
 702         }
 703         if (fp->num_children == 0) {
 704                 (void) fprintf(stderr,
 705                     "fortune: %s: No fortune files in directory.\n", fp->path);
 706                 return false;
 707         }
 708         return true;
 709 }
 710
 711 /*
 712  * is_dir:
 713  *      Return true if the file is a directory, false otherwise.
 714  */
 715 bool
 716 is_dir(const char *file)
 717 {
 718         auto struct stat        sbuf;
 719
 720         if (stat(file, &sbuf) < 0)
 721                 return false;
 722         return (sbuf.st_mode & S_IFDIR);
 723 }
 724
 725 /*
 726  * is_fortfile:
 727  *      Return true if the file is a fortune database file.  We try and
 728  *      exclude files without reading them if possible to avoid
 729  *      overhead.  Files which start with ".", or which have "illegal"
 730  *      suffixes, as contained in suflist[], are ruled out.
 731  */
 732 /* ARGSUSED */
 733 bool
 734 is_fortfile(const char *file, char **datp, char **posp, int check_for_offend)
 735 {
 736         int     i;
 737         const char      *sp;
 738         char    *datfile;
 739         static const char       *suflist[] = {  /* list of "illegal" suffixes" */
 740                                 "dat", "pos", "c", "h", "p", "i", "f",
 741                                 "pas", "ftn", "ins.c", "ins,pas",
 742                                 "ins.ftn", "sml",
 743                                 NULL
 744                         };
 745
 746         DPRINTF(2, (stderr, "is_fortfile(%s) returns ", file));
 747
 748         /*
 749          * Preclude any -o files for offendable people, and any non -o
 750          * files for completely offensive people.
 751          */
 752         if (check_for_offend && !All_forts) {
 753                 i = strlen(file);
 754                 if (Offend ^ (file[i - 2] == '-' && file[i - 1] == 'o')) {
 755                         DPRINTF(2, (stderr, "false (offending file)\n"));
 756                         return false;
 757                 }
 758         }
 759
 760         if ((sp = rindex(file, '/')) == NULL)
 761                 sp = file;
 762         else
 763                 sp++;
 764         if (*sp == '.') {
 765                 DPRINTF(2, (stderr, "false (file starts with '.')\n"));
 766                 return false;
 767         }
 768         if (Fortunes_only && strncmp(sp, "fortunes", 8) != 0) {
 769                 DPRINTF(2, (stderr, "false (check fortunes only)\n"));
 770                 return false;
 771         }
 772         if ((sp = rindex(sp, '.')) != NULL) {
 773                 sp++;
 774                 for (i = 0; suflist[i] != NULL; i++)
 775                         if (strcmp(sp, suflist[i]) == 0) {
 776                                 DPRINTF(2, (stderr, "false (file has suffix \".%s\")\n", sp));
 777                                 return false;
 778                         }
 779         }
 780
 781         datfile = copy(file, (unsigned int) (strlen(file) + 4)); /* +4 for ".dat" */
 782         strcat(datfile, ".dat");
 783         if (access(datfile, R_OK) < 0) {
 784                 DPRINTF(2, (stderr, "false (no readable \".dat\" file)\n"));
 785 #ifdef DEBUG
 786                 if (Debug < 2)
 787                         DPRINTF(0, (stderr, "Warning: file \"%s\" unreadable\n", datfile));
 788 #endif
 789                 free(datfile);
 790                 return false;
 791         }
 792         if (datp != NULL)
 793                 *datp = datfile;
 794         else
 795                 free(datfile);
 796         if (posp != NULL) {
 797 #ifdef  OK_TO_WRITE_DISK
 798                 *posp = copy(file, (unsigned int) (strlen(file) + 4)); /* +4 for ".dat" */
 799                 (void) strcat(*posp, ".pos");
 800 #else
 801                 *posp = NULL;
 802 #endif  /* OK_TO_WRITE_DISK */
 803         }
 804         DPRINTF(2, (stderr, "true\n"));
 805         return true;
 806 }
 807
 808 /*
 809  * copy:
 810  *      Return a malloc()'ed copy of the string
 811  */
 812 char *
 813 copy(const char *str, unsigned int len)
 814 {
 815         char    *new, *sp;
 816
 817         new = do_malloc(len + 1);
 818         sp = new;
 819         do {
 820                 *sp++ = *str;
 821         } while (*str++);
 822         return new;
 823 }
 824
 825 /*
 826  * do_malloc:
 827  *      Do a malloc, checking for NULL return.
 828  */
 829 void *
 830 do_malloc(unsigned int size)
 831 {
 832         void    *new;
 833
 834         if ((new = malloc(size)) == NULL) {
 835                 (void) fprintf(stderr, "fortune: out of memory.\n");
 836                 exit(1);
 837         }
 838         return new;
 839 }
 840
 841 /*
 842  * do_free:
 843  *      Free malloc'ed space, if any.
 844  */
 845 void
 846 do_free(void *ptr)
 847 {
 848         if (ptr != NULL)
 849                 free(ptr);
 850 }
 851
 852 /*
 853  * init_prob:
 854  *      Initialize the fortune probabilities.
 855  */
 856 void
 857 init_prob(void)
 858 {
 859         FILEDESC       *fp, *last = NULL;
 860         int             percent, num_noprob, frac;
 861
 862         /*
 863          * Distribute the residual probability (if any) across all
 864          * files with unspecified probability (i.e., probability of 0)
 865          * (if any).
 866          */
 867
 868         percent = 0;
 869         num_noprob = 0;
 870         for (fp = File_tail; fp != NULL; fp = fp->prev)
 871                 if (fp->percent == NO_PROB) {
 872                         num_noprob++;
 873                         if (Equal_probs)
 874                                 last = fp;
 875                 }
 876                 else
 877                         percent += fp->percent;
 878         DPRINTF(1, (stderr, "summing probabilities:%d%% with %d NO_PROB's",
 879                     percent, num_noprob));
 880         if (percent > 100) {
 881                 (void) fprintf(stderr,
 882                     "fortune: probabilities sum to %d%% > 100%%!\n", percent);
 883                 exit(1);
 884         }
 885         else if (percent < 100 && num_noprob == 0) {
 886                 (void) fprintf(stderr,
 887                     "fortune: no place to put residual probability (%d%% < 100%%)\n",
 888                     percent);
 889                 exit(1);
 890         }
 891         else if (percent == 100 && num_noprob != 0) {
 892                 (void) fprintf(stderr,
 893                     "fortune: no probability left to put in residual files (100%%)\n");
 894                 exit(1);
 895         }
 896         percent = 100 - percent;
 897         if (Equal_probs) {
 898                 if (num_noprob != 0) {
 899                         if (num_noprob > 1) {
 900                                 frac = percent / num_noprob;
 901                                 DPRINTF(1, (stderr, ", frac = %d%%", frac));
 902                                 for (fp = File_list; fp != last; fp = fp->next)
 903                                         if (fp->percent == NO_PROB) {
 904                                                 fp->percent = frac;
 905                                                 percent -= frac;
 906                                         }
 907                         }
 908                         last->percent = percent;
 909                         DPRINTF(1, (stderr, ", residual = %d%%", percent));
 910                 }
 911         else
 912                 DPRINTF(1, (stderr,
 913                             ", %d%% distributed over remaining fortunes\n",
 914                             percent));
 915         }
 916         DPRINTF(1, (stderr, "\n"));
 917
 918 #ifdef DEBUG
 919         if (Debug >= 1)
 920                 print_file_list();
 921 #endif
 922 }
 923
 924 /*
 925  * get_fort:
 926  *      Get the fortune data file's seek pointer for the next fortune.
 927  */
 928 void
 929 get_fort(void)
 930 {
 931         FILEDESC        *fp;
 932         int             choice;
 933
 934         if (File_list->next == NULL || File_list->percent == NO_PROB)
 935                 fp = File_list;
 936         else {
 937                 choice = random() % 100;
 938                 DPRINTF(1, (stderr, "choice = %d\n", choice));
 939                 for (fp = File_list; fp->percent != NO_PROB; fp = fp->next)
 940                         if (choice < fp->percent)
 941                                 break;
 942                         else {
 943                                 choice -= fp->percent;
 944                                 DPRINTF(1, (stderr,
 945                                             "    skip \"%s\", %d%% (choice = %d)\n",
 946                                             fp->name, fp->percent, choice));
 947                         }
 948                         DPRINTF(1, (stderr,
 949                                     "using \"%s\", %d%% (choice = %d)\n",
 950                                     fp->name, fp->percent, choice));
 951         }
 952         if (fp->percent != NO_PROB)
 953                 get_tbl(fp);
 954         else {
 955                 if (fp->next != NULL) {
 956                         sum_noprobs(fp);
 957                         choice = random() % Noprob_tbl.str_numstr;
 958                         DPRINTF(1, (stderr, "choice = %d (of %ld) \n", choice,
 959                                     Noprob_tbl.str_numstr));
 960                         while ((unsigned int)choice >= fp->tbl.str_numstr) {
 961                                 choice -= fp->tbl.str_numstr;
 962                                 fp = fp->next;
 963                                 DPRINTF(1, (stderr,
 964                                             "    skip \"%s\", %ld (choice = %d)\n",
 965                                             fp->name, fp->tbl.str_numstr,
 966                                             choice));
 967                         }
 968                         DPRINTF(1, (stderr, "using \"%s\", %ld\n", fp->name,
 969                                     fp->tbl.str_numstr));
 970                 }
 971                 get_tbl(fp);
 972         }
 973         if (fp->child != NULL) {
 974                 DPRINTF(1, (stderr, "picking child\n"));
 975                 fp = pick_child(fp);
 976         }
 977         Fortfile = fp;
 978         get_pos(fp);
 979         open_dat(fp);
 980         (void) lseek(fp->datfd,
 981                      (off_t) (sizeof fp->tbl + fp->pos * sizeof Seekpts[0]), 0);
 982         read(fp->datfd, Seekpts, sizeof Seekpts);
 983         Seekpts[0] = ntohl(Seekpts[0]);
 984         Seekpts[1] = ntohl(Seekpts[1]);
 985 }
 986
 987 /*
 988  * pick_child
 989  *      Pick a child from a chosen parent.
 990  */
 991 FILEDESC *
 992 pick_child(FILEDESC *parent)
 993 {
 994         FILEDESC        *fp;
 995         int             choice;
 996
 997         if (Equal_probs) {
 998                 choice = random() % parent->num_children;
 999                 DPRINTF(1, (stderr, "    choice = %d (of %d)\n",
1000                             choice, parent->num_children));
1001                 for (fp = parent->child; choice--; fp = fp->next)
1002                         continue;
1003                 DPRINTF(1, (stderr, "    using %s\n", fp->name));
1004                 return fp;
1005         }
1006         else {
1007                 get_tbl(parent);
1008                 choice = random() % parent->tbl.str_numstr;
1009                 DPRINTF(1, (stderr, "    choice = %d (of %ld)\n",
1010                             choice, parent->tbl.str_numstr));
1011                 for (fp = parent->child; (unsigned int)choice >= fp->tbl.str_numstr;
1012                      fp = fp->next) {
1013                         choice -= fp->tbl.str_numstr;
1014                         DPRINTF(1, (stderr, "\tskip %s, %ld (choice = %d)\n",
1015                                     fp->name, fp->tbl.str_numstr, choice));
1016                 }
1017                 DPRINTF(1, (stderr, "    using %s, %ld\n", fp->name,
1018                             fp->tbl.str_numstr));
1019                 return fp;
1020         }
1021 }
1022
1023 /*
1024  * sum_noprobs:
1025  *      Sum up all the noprob probabilities, starting with fp.
1026  */
1027 void
1028 sum_noprobs(FILEDESC *fp)
1029 {
1030         static bool     did_noprobs = false;
1031
1032         if (did_noprobs)
1033                 return;
1034         zero_tbl(&Noprob_tbl);
1035         while (fp != NULL) {
1036                 get_tbl(fp);
1037                 sum_tbl(&Noprob_tbl, &fp->tbl);
1038                 fp = fp->next;
1039         }
1040         did_noprobs = true;
1041 }
1042
1043 int
1044 max(int i, int j)
1045 {
1046         return (i >= j ? i : j);
1047 }
1048
1049 /*
1050  * open_fp:
1051  *      Assocatiate a FILE * with the given FILEDESC.
1052  */
1053 void
1054 open_fp(FILEDESC *fp)
1055 {
1056         if (fp->inf == NULL && (fp->inf = fdopen(fp->fd, "r")) == NULL) {
1057                 perror(fp->path);
1058                 exit(1);
1059         }
1060 }
1061
1062 /*
1063  * open_dat:
1064  *      Open up the dat file if we need to.
1065  */
1066 void
1067 open_dat(FILEDESC *fp)
1068 {
1069         if (fp->datfd < 0 && (fp->datfd = open(fp->datfile, 0)) < 0) {
1070                 perror(fp->datfile);
1071                 exit(1);
1072         }
1073 }
1074
1075 /*
1076  * get_pos:
1077  *      Get the position from the pos file, if there is one.  If not,
1078  *      return a random number.
1079  */
1080 void
1081 get_pos(FILEDESC *fp)
1082 {
1083 #ifdef  OK_TO_WRITE_DISK
1084         int     fd;
1085 #endif /* OK_TO_WRITE_DISK */
1086
1087         assert(fp->read_tbl);
1088         if (fp->pos == POS_UNKNOWN) {
1089 #ifdef  OK_TO_WRITE_DISK
1090                 if ((fd = open(fp->posfile, 0)) < 0 ||
1091                     read(fd, &fp->pos, sizeof fp->pos) != sizeof fp->pos)
1092                         fp->pos = random() % fp->tbl.str_numstr;
1093                 else if (fp->pos >= fp->tbl.str_numstr)
1094                         fp->pos %= fp->tbl.str_numstr;
1095                 if (fd >= 0)
1096                         (void) close(fd);
1097 #else
1098                 fp->pos = random() % fp->tbl.str_numstr;
1099 #endif /* OK_TO_WRITE_DISK */
1100         }
1101         if ((unsigned int)++(fp->pos) >= fp->tbl.str_numstr)
1102                 fp->pos -= fp->tbl.str_numstr;
1103         DPRINTF(1, (stderr, "pos for %s is %ld\n", fp->name, fp->pos));
1104 }
1105
1106 /*
1107  * get_tbl:
1108  *      Get the tbl data file the datfile.
1109  */
1110 void
1111 get_tbl(FILEDESC *fp)
1112 {
1113         auto int                fd;
1114         FILEDESC        *child;
1115
1116         if (fp->read_tbl)
1117                 return;
1118         if (fp->child == NULL) {
1119                 if ((fd = open(fp->datfile, 0)) < 0) {
1120                         perror(fp->datfile);
1121                         exit(1);
1122                 }
1123                 if (read(fd, (char *) &fp->tbl, sizeof fp->tbl) != sizeof fp->tbl) {
1124                         (void)fprintf(stderr,
1125                             "fortune: %s corrupted\n", fp->path);
1126                         exit(1);
1127                 }
1128                 /* fp->tbl.str_version = ntohl(fp->tbl.str_version); */
1129                 fp->tbl.str_numstr = ntohl(fp->tbl.str_numstr);
1130                 fp->tbl.str_longlen = ntohl(fp->tbl.str_longlen);
1131                 fp->tbl.str_shortlen = ntohl(fp->tbl.str_shortlen);
1132                 fp->tbl.str_flags = ntohl(fp->tbl.str_flags);
1133                 (void) close(fd);
1134         }
1135         else {
1136                 zero_tbl(&fp->tbl);
1137                 for (child = fp->child; child != NULL; child = child->next) {
1138                         get_tbl(child);
1139                         sum_tbl(&fp->tbl, &child->tbl);
1140                 }
1141         }
1142         fp->read_tbl = true;
1143 }
1144
1145 /*
1146  * zero_tbl:
1147  *      Zero out the fields we care about in a tbl structure.
1148  */
1149 void
1150 zero_tbl(STRFILE *tp)
1151 {
1152         tp->str_numstr = 0;
1153         tp->str_longlen = 0;
1154         tp->str_shortlen = ~((unsigned long)0);
1155 }
1156
1157 /*
1158  * sum_tbl:
1159  *      Merge the tbl data of t2 into t1.
1160  */
1161 void
1162 sum_tbl(STRFILE *t1, STRFILE *t2)
1163 {
1164         t1->str_numstr += t2->str_numstr;
1165         if (t1->str_longlen < t2->str_longlen)
1166                 t1->str_longlen = t2->str_longlen;
1167         if (t1->str_shortlen > t2->str_shortlen)
1168                 t1->str_shortlen = t2->str_shortlen;
1169 }
1170
1171 #define STR(str)        ((str) == NULL ? "NULL" : (str))
1172
1173 /*
1174  * print_file_list:
1175  *      Print out the file list
1176  */
1177 void
1178 print_file_list(void)
1179 {
1180         print_list(File_list, 0);
1181 }
1182
1183 /*
1184  * print_list:
1185  *      Print out the actual list, recursively.
1186  */
1187 void
1188 print_list(FILEDESC *list, int lev)
1189 {
1190         while (list != NULL) {
1191                 fprintf(stderr, "%*s", lev * 4, "");
1192                 if (list->percent == NO_PROB)
1193                         fprintf(stderr, "___%%");
1194                 else
1195                         fprintf(stderr, "%3d%%", list->percent);
1196                 fprintf(stderr, " %s", STR(list->name));
1197                 DPRINTF(1, (stderr, " (%s, %s, %s)", STR(list->path),
1198                             STR(list->datfile), STR(list->posfile)));
1199                 fprintf(stderr, "\n");
1200                 if (list->child != NULL)
1201                         print_list(list->child, lev + 1);
1202                 list = list->next;
1203         }
1204 }
1205
1206 #ifndef NO_REGEX
1207 /*
1208  * conv_pat:
1209  *      Convert the pattern to an ignore-case equivalent.
1210  */
1211 char *
1212 conv_pat(char *orig)
1213 {
1214         char            *sp;
1215         unsigned int    cnt;
1216         char            *new;
1217
1218         cnt = 1;        /* allow for '\0' */
1219         for (sp = orig; *sp != '\0'; sp++)
1220                 if (isalpha((unsigned char)*sp))
1221                         cnt += 4;
1222                 else
1223                         cnt++;
1224         if ((new = malloc(cnt)) == NULL) {
1225                 fprintf(stderr, "pattern too long for ignoring case\n");
1226                 exit(1);
1227         }
1228
1229         for (sp = new; *orig != '\0'; orig++) {
1230                 if (islower((unsigned char)*orig)) {
1231                         *sp++ = '[';
1232                         *sp++ = *orig;
1233                         *sp++ = toupper((unsigned char)*orig);
1234                         *sp++ = ']';
1235                 }
1236                 else if (isupper((unsigned char)*orig)) {
1237                         *sp++ = '[';
1238                         *sp++ = *orig;
1239                         *sp++ = tolower((unsigned char)*orig);
1240                         *sp++ = ']';
1241                 }
1242                 else
1243                         *sp++ = *orig;
1244         }
1245         *sp = '\0';
1246         return new;
1247 }
1248
1249 /*
1250  * find_matches:
1251  *      Find all the fortunes which match the pattern we've been given.
1252  */
1253 int
1254 find_matches(void)
1255 {
1256         Fort_len = maxlen_in_list(File_list);
1257         DPRINTF(2, (stderr, "Maximum length is %d\n", Fort_len));
1258         /* extra length, "%\n" is appended */
1259         Fortbuf = do_malloc((unsigned int) Fort_len + 10);
1260
1261         Found_one = false;
1262         matches_in_list(File_list);
1263         return Found_one;
1264         /* NOTREACHED */
1265 }
1266
1267 /*
1268  * maxlen_in_list
1269  *      Return the maximum fortune len in the file list.
1270  */
1271 int
1272 maxlen_in_list(FILEDESC *list)
1273 {
1274         FILEDESC        *fp;
1275         int             len, maxlen;
1276
1277         maxlen = 0;
1278         for (fp = list; fp != NULL; fp = fp->next) {
1279                 if (fp->child != NULL) {
1280                         if ((len = maxlen_in_list(fp->child)) > maxlen)
1281                                 maxlen = len;
1282                 }
1283                 else {
1284                         get_tbl(fp);
1285                         if (fp->tbl.str_longlen > (unsigned int)maxlen)
1286                                 maxlen = fp->tbl.str_longlen;
1287                 }
1288         }
1289         return maxlen;
1290 }
1291
1292 /*
1293  * matches_in_list
1294  *      Print out the matches from the files in the list.
1295  */
1296 void
1297 matches_in_list(FILEDESC *list)
1298 {
1299         char           *sp, *p;
1300         FILEDESC        *fp;
1301         int                     in_file;
1302         unsigned char           ch;
1303
1304         for (fp = list; fp != NULL; fp = fp->next) {
1305                 if (fp->child != NULL) {
1306                         matches_in_list(fp->child);
1307                         continue;
1308                 }
1309                 DPRINTF(1, (stderr, "searching in %s\n", fp->path));
1310                 open_fp(fp);
1311                 sp = Fortbuf;
1312                 in_file = false;
1313                 while (fgets(sp, Fort_len, fp->inf) != NULL)
1314                         if (fp->tbl.str_flags & STR_COMMENTS
1315                             && sp[0] == fp->tbl.str_delim
1316                             && sp[1] == fp->tbl.str_delim)
1317                                 continue;
1318                         else if (!STR_ENDSTRING(sp, fp->tbl))
1319                                 sp += strlen(sp);
1320                         else {
1321                                 *sp = '\0';
1322                                 if (fp->tbl.str_flags & STR_ROTATED)
1323                                         for (p = Fortbuf; (ch = *p) != '\0'; ++p) {
1324                                                 if (isascii(ch)) {
1325                                                         if (isupper(ch))
1326                                                                 *p = 'A' + (ch - 'A' + 13) % 26;
1327                                                         else if (islower(ch))
1328                                                                 *p = 'a' + (ch - 'a' + 13) % 26;
1329                                                 }
1330                                         }
1331                                 if (RE_EXEC(Fortbuf)) {
1332                                         printf("%c%c", fp->tbl.str_delim,
1333                                             fp->tbl.str_delim);
1334                                         if (!in_file) {
1335                                                 printf(" (%s)", fp->name);
1336                                                 Found_one = true;
1337                                                 in_file = true;
1338                                         }
1339                                         putchar('\n');
1340                                         (void) fwrite(Fortbuf, 1, (sp - Fortbuf), stdout);
1341                                 }
1342                                 sp = Fortbuf;
1343                         }
1344         }
1345 }
1346 # endif /* NO_REGEX */
1347
1348 void
1349 usage(void)
1350 {
1351         (void) fprintf(stderr, "fortune [-a");
1352 #ifdef  DEBUG
1353         (void) fprintf(stderr, "D");
1354 #endif  /* DEBUG */
1355         (void) fprintf(stderr, "f");
1356 #ifndef NO_REGEX
1357         (void) fprintf(stderr, "i");
1358 #endif  /* NO_REGEX */
1359         (void) fprintf(stderr, "losw]");
1360 #ifndef NO_REGEX
1361         (void) fprintf(stderr, " [-m pattern]");
1362 #endif  /* NO_REGEX */
1363         (void) fprintf(stderr, "[[#%%] file/directory/all]\n");
1364         exit(1);
1365 }