bin/mandoc/mandocdb.c

   1 /*      $Id: mandocdb.c,v 1.258 2018/02/23 18:25:57 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2011-2017 Ingo Schwarze <schwarze@openbsd.org>
   5  * Copyright (c) 2016 Ed Maste <emaste@freebsd.org>
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include "config.h"
  20
  21 #include <sys/types.h>
  22 #include <sys/mman.h>
  23 #include <sys/stat.h>
  24
  25 #include <assert.h>
  26 #include <ctype.h>
  27 #if HAVE_ERR
  28 #include <err.h>
  29 #endif
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #if HAVE_FTS
  33 #include <fts.h>
  34 #else
  35 #include "compat_fts.h"
  36 #endif
  37 #include <limits.h>
  38 #if HAVE_SANDBOX_INIT
  39 #include <sandbox.h>
  40 #endif
  41 #include <stdarg.h>
  42 #include <stddef.h>
  43 #include <stdio.h>
  44 #include <stdint.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <unistd.h>
  48
  49 #include "mandoc_aux.h"
  50 #include "mandoc_ohash.h"
  51 #include "mandoc.h"
  52 #include "roff.h"
  53 #include "mdoc.h"
  54 #include "man.h"
  55 #include "manconf.h"
  56 #include "mansearch.h"
  57 #include "dba_array.h"
  58 #include "dba.h"
  59
  60 extern const char *const mansearch_keynames[];
  61
  62 enum    op {
  63         OP_DEFAULT = 0, /* new dbs from dir list or default config */
  64         OP_CONFFILE, /* new databases from custom config file */
  65         OP_UPDATE, /* delete/add entries in existing database */
  66         OP_DELETE, /* delete entries from existing database */
  67         OP_TEST /* change no databases, report potential problems */
  68 };
  69
  70 struct  str {
  71         const struct mpage *mpage; /* if set, the owning parse */
  72         uint64_t         mask; /* bitmask in sequence */
  73         char             key[]; /* rendered text */
  74 };
  75
  76 struct  inodev {
  77         ino_t            st_ino;
  78         dev_t            st_dev;
  79 };
  80
  81 struct  mpage {
  82         struct inodev    inodev;  /* used for hashing routine */
  83         struct dba_array *dba;
  84         char            *sec;     /* section from file content */
  85         char            *arch;    /* architecture from file content */
  86         char            *title;   /* title from file content */
  87         char            *desc;    /* description from file content */
  88         struct mpage    *next;    /* singly linked list */
  89         struct mlink    *mlinks;  /* singly linked list */
  90         int              name_head_done;
  91         enum form        form;    /* format from file content */
  92 };
  93
  94 struct  mlink {
  95         char             file[PATH_MAX]; /* filename rel. to manpath */
  96         char            *dsec;    /* section from directory */
  97         char            *arch;    /* architecture from directory */
  98         char            *name;    /* name from file name (not empty) */
  99         char            *fsec;    /* section from file name suffix */
 100         struct mlink    *next;    /* singly linked list */
 101         struct mpage    *mpage;   /* parent */
 102         int              gzip;    /* filename has a .gz suffix */
 103         enum form        dform;   /* format from directory */
 104         enum form        fform;   /* format from file name suffix */
 105 };
 106
 107 typedef int (*mdoc_fp)(struct mpage *, const struct roff_meta *,
 108                         const struct roff_node *);
 109
 110 struct  mdoc_handler {
 111         mdoc_fp          fp; /* optional handler */
 112         uint64_t         mask;  /* set unless handler returns 0 */
 113         int              taboo;  /* node flags that must not be set */
 114 };
 115
 116
 117 int              mandocdb(int, char *[]);
 118
 119 static  void     dbadd(struct dba *, struct mpage *);
 120 static  void     dbadd_mlink(const struct mlink *mlink);
 121 static  void     dbprune(struct dba *);
 122 static  void     dbwrite(struct dba *);
 123 static  void     filescan(const char *);
 124 #if HAVE_FTS_COMPARE_CONST
 125 static  int      fts_compare(const FTSENT *const *, const FTSENT *const *);
 126 #else
 127 static  int      fts_compare(const FTSENT **, const FTSENT **);
 128 #endif
 129 static  void     mlink_add(struct mlink *, const struct stat *);
 130 static  void     mlink_check(struct mpage *, struct mlink *);
 131 static  void     mlink_free(struct mlink *);
 132 static  void     mlinks_undupe(struct mpage *);
 133 static  void     mpages_free(void);
 134 static  void     mpages_merge(struct dba *, struct mparse *);
 135 static  void     parse_cat(struct mpage *, int);
 136 static  void     parse_man(struct mpage *, const struct roff_meta *,
 137                         const struct roff_node *);
 138 static  void     parse_mdoc(struct mpage *, const struct roff_meta *,
 139                         const struct roff_node *);
 140 static  int      parse_mdoc_head(struct mpage *, const struct roff_meta *,
 141                         const struct roff_node *);
 142 static  int      parse_mdoc_Fa(struct mpage *, const struct roff_meta *,
 143                         const struct roff_node *);
 144 static  int      parse_mdoc_Fd(struct mpage *, const struct roff_meta *,
 145                         const struct roff_node *);
 146 static  void     parse_mdoc_fname(struct mpage *, const struct roff_node *);
 147 static  int      parse_mdoc_Fn(struct mpage *, const struct roff_meta *,
 148                         const struct roff_node *);
 149 static  int      parse_mdoc_Fo(struct mpage *, const struct roff_meta *,
 150                         const struct roff_node *);
 151 static  int      parse_mdoc_Nd(struct mpage *, const struct roff_meta *,
 152                         const struct roff_node *);
 153 static  int      parse_mdoc_Nm(struct mpage *, const struct roff_meta *,
 154                         const struct roff_node *);
 155 static  int      parse_mdoc_Sh(struct mpage *, const struct roff_meta *,
 156                         const struct roff_node *);
 157 static  int      parse_mdoc_Va(struct mpage *, const struct roff_meta *,
 158                         const struct roff_node *);
 159 static  int      parse_mdoc_Xr(struct mpage *, const struct roff_meta *,
 160                         const struct roff_node *);
 161 static  void     putkey(const struct mpage *, char *, uint64_t);
 162 static  void     putkeys(const struct mpage *, char *, size_t, uint64_t);
 163 static  void     putmdockey(const struct mpage *,
 164                         const struct roff_node *, uint64_t, int);
 165 static  int      render_string(char **, size_t *);
 166 static  void     say(const char *, const char *, ...)
 167                         __attribute__((__format__ (__printf__, 2, 3)));
 168 static  int      set_basedir(const char *, int);
 169 static  int      treescan(void);
 170 static  size_t   utf8(unsigned int, char [7]);
 171
 172 static  int              nodb; /* no database changes */
 173 static  int              mparse_options; /* abort the parse early */
 174 static  int              use_all; /* use all found files */
 175 static  int              debug; /* print what we're doing */
 176 static  int              warnings; /* warn about crap */
 177 static  int              write_utf8; /* write UTF-8 output; else ASCII */
 178 static  int              exitcode; /* to be returned by main */
 179 static  enum op          op; /* operational mode */
 180 static  char             basedir[PATH_MAX]; /* current base directory */
 181 static  struct mpage    *mpage_head; /* list of distinct manual pages */
 182 static  struct ohash     mpages; /* table of distinct manual pages */
 183 static  struct ohash     mlinks; /* table of directory entries */
 184 static  struct ohash     names; /* table of all names */
 185 static  struct ohash     strings; /* table of all strings */
 186 static  uint64_t         name_mask;
 187
 188 static  const struct mdoc_handler __mdocs[MDOC_MAX - MDOC_Dd] = {
 189         { NULL, 0, NODE_NOPRT },  /* Dd */
 190         { NULL, 0, NODE_NOPRT },  /* Dt */
 191         { NULL, 0, NODE_NOPRT },  /* Os */
 192         { parse_mdoc_Sh, TYPE_Sh, 0 }, /* Sh */
 193         { parse_mdoc_head, TYPE_Ss, 0 }, /* Ss */
 194         { NULL, 0, 0 },  /* Pp */
 195         { NULL, 0, 0 },  /* D1 */
 196         { NULL, 0, 0 },  /* Dl */
 197         { NULL, 0, 0 },  /* Bd */
 198         { NULL, 0, 0 },  /* Ed */
 199         { NULL, 0, 0 },  /* Bl */
 200         { NULL, 0, 0 },  /* El */
 201         { NULL, 0, 0 },  /* It */
 202         { NULL, 0, 0 },  /* Ad */
 203         { NULL, TYPE_An, 0 },  /* An */
 204         { NULL, 0, 0 },  /* Ap */
 205         { NULL, TYPE_Ar, 0 },  /* Ar */
 206         { NULL, TYPE_Cd, 0 },  /* Cd */
 207         { NULL, TYPE_Cm, 0 },  /* Cm */
 208         { NULL, TYPE_Dv, 0 },  /* Dv */
 209         { NULL, TYPE_Er, 0 },  /* Er */
 210         { NULL, TYPE_Ev, 0 },  /* Ev */
 211         { NULL, 0, 0 },  /* Ex */
 212         { parse_mdoc_Fa, 0, 0 },  /* Fa */
 213         { parse_mdoc_Fd, 0, 0 },  /* Fd */
 214         { NULL, TYPE_Fl, 0 },  /* Fl */
 215         { parse_mdoc_Fn, 0, 0 },  /* Fn */
 216         { NULL, TYPE_Ft | TYPE_Vt, 0 },  /* Ft */
 217         { NULL, TYPE_Ic, 0 },  /* Ic */
 218         { NULL, TYPE_In, 0 },  /* In */
 219         { NULL, TYPE_Li, 0 },  /* Li */
 220         { parse_mdoc_Nd, 0, 0 },  /* Nd */
 221         { parse_mdoc_Nm, 0, 0 },  /* Nm */
 222         { NULL, 0, 0 },  /* Op */
 223         { NULL, 0, 0 },  /* Ot */
 224         { NULL, TYPE_Pa, NODE_NOSRC },  /* Pa */
 225         { NULL, 0, 0 },  /* Rv */
 226         { NULL, TYPE_St, 0 },  /* St */
 227         { parse_mdoc_Va, TYPE_Va, 0 },  /* Va */
 228         { parse_mdoc_Va, TYPE_Vt, 0 },  /* Vt */
 229         { parse_mdoc_Xr, 0, 0 },  /* Xr */
 230         { NULL, 0, 0 },  /* %A */
 231         { NULL, 0, 0 },  /* %B */
 232         { NULL, 0, 0 },  /* %D */
 233         { NULL, 0, 0 },  /* %I */
 234         { NULL, 0, 0 },  /* %J */
 235         { NULL, 0, 0 },  /* %N */
 236         { NULL, 0, 0 },  /* %O */
 237         { NULL, 0, 0 },  /* %P */
 238         { NULL, 0, 0 },  /* %R */
 239         { NULL, 0, 0 },  /* %T */
 240         { NULL, 0, 0 },  /* %V */
 241         { NULL, 0, 0 },  /* Ac */
 242         { NULL, 0, 0 },  /* Ao */
 243         { NULL, 0, 0 },  /* Aq */
 244         { NULL, TYPE_At, 0 },  /* At */
 245         { NULL, 0, 0 },  /* Bc */
 246         { NULL, 0, 0 },  /* Bf */
 247         { NULL, 0, 0 },  /* Bo */
 248         { NULL, 0, 0 },  /* Bq */
 249         { NULL, TYPE_Bsx, NODE_NOSRC },  /* Bsx */
 250         { NULL, TYPE_Bx, NODE_NOSRC },  /* Bx */
 251         { NULL, 0, 0 },  /* Db */
 252         { NULL, 0, 0 },  /* Dc */
 253         { NULL, 0, 0 },  /* Do */
 254         { NULL, 0, 0 },  /* Dq */
 255         { NULL, 0, 0 },  /* Ec */
 256         { NULL, 0, 0 },  /* Ef */
 257         { NULL, TYPE_Em, 0 },  /* Em */
 258         { NULL, 0, 0 },  /* Eo */
 259         { NULL, TYPE_Fx, NODE_NOSRC },  /* Fx */
 260         { NULL, TYPE_Ms, 0 },  /* Ms */
 261         { NULL, 0, 0 },  /* No */
 262         { NULL, 0, 0 },  /* Ns */
 263         { NULL, TYPE_Nx, NODE_NOSRC },  /* Nx */
 264         { NULL, TYPE_Ox, NODE_NOSRC },  /* Ox */
 265         { NULL, 0, 0 },  /* Pc */
 266         { NULL, 0, 0 },  /* Pf */
 267         { NULL, 0, 0 },  /* Po */
 268         { NULL, 0, 0 },  /* Pq */
 269         { NULL, 0, 0 },  /* Qc */
 270         { NULL, 0, 0 },  /* Ql */
 271         { NULL, 0, 0 },  /* Qo */
 272         { NULL, 0, 0 },  /* Qq */
 273         { NULL, 0, 0 },  /* Re */
 274         { NULL, 0, 0 },  /* Rs */
 275         { NULL, 0, 0 },  /* Sc */
 276         { NULL, 0, 0 },  /* So */
 277         { NULL, 0, 0 },  /* Sq */
 278         { NULL, 0, 0 },  /* Sm */
 279         { NULL, 0, 0 },  /* Sx */
 280         { NULL, TYPE_Sy, 0 },  /* Sy */
 281         { NULL, TYPE_Tn, 0 },  /* Tn */
 282         { NULL, 0, NODE_NOSRC },  /* Ux */
 283         { NULL, 0, 0 },  /* Xc */
 284         { NULL, 0, 0 },  /* Xo */
 285         { parse_mdoc_Fo, 0, 0 },  /* Fo */
 286         { NULL, 0, 0 },  /* Fc */
 287         { NULL, 0, 0 },  /* Oo */
 288         { NULL, 0, 0 },  /* Oc */
 289         { NULL, 0, 0 },  /* Bk */
 290         { NULL, 0, 0 },  /* Ek */
 291         { NULL, 0, 0 },  /* Bt */
 292         { NULL, 0, 0 },  /* Hf */
 293         { NULL, 0, 0 },  /* Fr */
 294         { NULL, 0, 0 },  /* Ud */
 295         { NULL, TYPE_Lb, NODE_NOSRC },  /* Lb */
 296         { NULL, 0, 0 },  /* Lp */
 297         { NULL, TYPE_Lk, 0 },  /* Lk */
 298         { NULL, TYPE_Mt, NODE_NOSRC },  /* Mt */
 299         { NULL, 0, 0 },  /* Brq */
 300         { NULL, 0, 0 },  /* Bro */
 301         { NULL, 0, 0 },  /* Brc */
 302         { NULL, 0, 0 },  /* %C */
 303         { NULL, 0, 0 },  /* Es */
 304         { NULL, 0, 0 },  /* En */
 305         { NULL, TYPE_Dx, NODE_NOSRC },  /* Dx */
 306         { NULL, 0, 0 },  /* %Q */
 307         { NULL, 0, 0 },  /* %U */
 308         { NULL, 0, 0 },  /* Ta */
 309 };
 310 static  const struct mdoc_handler *const mdocs = __mdocs - MDOC_Dd;
 311
 312
 313 int
 314 mandocdb(int argc, char *argv[])
 315 {
 316         struct manconf    conf;
 317         struct mparse    *mp;
 318         struct dba       *dba;
 319         const char       *path_arg, *progname;
 320         size_t            j, sz;
 321         int               ch, i;
 322
 323 #if HAVE_PLEDGE
 324         if (pledge("stdio rpath wpath cpath", NULL) == -1) {
 325                 warn("pledge");
 326                 return (int)MANDOCLEVEL_SYSERR;
 327         }
 328 #endif
 329
 330 #if HAVE_SANDBOX_INIT
 331         if (sandbox_init(kSBXProfileNoInternet, SANDBOX_NAMED, NULL) == -1) {
 332                 warnx("sandbox_init");
 333                 return (int)MANDOCLEVEL_SYSERR;
 334         }
 335 #endif
 336
 337         memset(&conf, 0, sizeof(conf));
 338
 339         /*
 340          * We accept a few different invocations.
 341          * The CHECKOP macro makes sure that invocation styles don't
 342          * clobber each other.
 343          */
 344 #define CHECKOP(_op, _ch) do \
 345         if (OP_DEFAULT != (_op)) { \
 346                 warnx("-%c: Conflicting option", (_ch)); \
 347                 goto usage; \
 348         } while (/*CONSTCOND*/0)
 349
 350         path_arg = NULL;
 351         op = OP_DEFAULT;
 352
 353         while (-1 != (ch = getopt(argc, argv, "aC:Dd:npQT:tu:v")))
 354                 switch (ch) {
 355                 case 'a':
 356                         use_all = 1;
 357                         break;
 358                 case 'C':
 359                         CHECKOP(op, ch);
 360                         path_arg = optarg;
 361                         op = OP_CONFFILE;
 362                         break;
 363                 case 'D':
 364                         debug++;
 365                         break;
 366                 case 'd':
 367                         CHECKOP(op, ch);
 368                         path_arg = optarg;
 369                         op = OP_UPDATE;
 370                         break;
 371                 case 'n':
 372                         nodb = 1;
 373                         break;
 374                 case 'p':
 375                         warnings = 1;
 376                         break;
 377                 case 'Q':
 378                         mparse_options |= MPARSE_QUICK;
 379                         break;
 380                 case 'T':
 381                         if (strcmp(optarg, "utf8")) {
 382                                 warnx("-T%s: Unsupported output format",
 383                                     optarg);
 384                                 goto usage;
 385                         }
 386                         write_utf8 = 1;
 387                         break;
 388                 case 't':
 389                         CHECKOP(op, ch);
 390                         dup2(STDOUT_FILENO, STDERR_FILENO);
 391                         op = OP_TEST;
 392                         nodb = warnings = 1;
 393                         break;
 394                 case 'u':
 395                         CHECKOP(op, ch);
 396                         path_arg = optarg;
 397                         op = OP_DELETE;
 398                         break;
 399                 case 'v':
 400                         /* Compatibility with espie@'s makewhatis. */
 401                         break;
 402                 default:
 403                         goto usage;
 404                 }
 405
 406         argc -= optind;
 407         argv += optind;
 408
 409 #if HAVE_PLEDGE
 410         if (nodb) {
 411                 if (pledge("stdio rpath", NULL) == -1) {
 412                         warn("pledge");
 413                         return (int)MANDOCLEVEL_SYSERR;
 414                 }
 415         }
 416 #endif
 417
 418         if (OP_CONFFILE == op && argc > 0) {
 419                 warnx("-C: Too many arguments");
 420                 goto usage;
 421         }
 422
 423         exitcode = (int)MANDOCLEVEL_OK;
 424         mchars_alloc();
 425         mp = mparse_alloc(mparse_options, MANDOCERR_MAX, NULL,
 426             MANDOC_OS_OTHER, NULL);
 427         mandoc_ohash_init(&mpages, 6, offsetof(struct mpage, inodev));
 428         mandoc_ohash_init(&mlinks, 6, offsetof(struct mlink, file));
 429
 430         if (OP_UPDATE == op || OP_DELETE == op || OP_TEST == op) {
 431
 432                 /*
 433                  * Most of these deal with a specific directory.
 434                  * Jump into that directory first.
 435                  */
 436                 if (OP_TEST != op && 0 == set_basedir(path_arg, 1))
 437                         goto out;
 438
 439                 dba = nodb ? dba_new(128) : dba_read(MANDOC_DB);
 440                 if (dba != NULL) {
 441                         /*
 442                          * The existing database is usable.  Process
 443                          * all files specified on the command-line.
 444                          */
 445                         use_all = 1;
 446                         for (i = 0; i < argc; i++)
 447                                 filescan(argv[i]);
 448                         if (nodb == 0)
 449                                 dbprune(dba);
 450                 } else {
 451                         /* Database missing or corrupt. */
 452                         if (op != OP_UPDATE || errno != ENOENT)
 453                                 say(MANDOC_DB, "%s: Automatically recreating"
 454                                     " from scratch", strerror(errno));
 455                         exitcode = (int)MANDOCLEVEL_OK;
 456                         op = OP_DEFAULT;
 457                         if (0 == treescan())
 458                                 goto out;
 459                         dba = dba_new(128);
 460                 }
 461                 if (OP_DELETE != op)
 462                         mpages_merge(dba, mp);
 463                 if (nodb == 0)
 464                         dbwrite(dba);
 465                 dba_free(dba);
 466         } else {
 467                 /*
 468                  * If we have arguments, use them as our manpaths.
 469                  * If we don't, use man.conf(5).
 470                  */
 471                 if (argc > 0) {
 472                         conf.manpath.paths = mandoc_reallocarray(NULL,
 473                             argc, sizeof(char *));
 474                         conf.manpath.sz = (size_t)argc;
 475                         for (i = 0; i < argc; i++)
 476                                 conf.manpath.paths[i] = mandoc_strdup(argv[i]);
 477                 } else
 478                         manconf_parse(&conf, path_arg, NULL, NULL);
 479
 480                 if (conf.manpath.sz == 0) {
 481                         exitcode = (int)MANDOCLEVEL_BADARG;
 482                         say("", "Empty manpath");
 483                 }
 484
 485                 /*
 486                  * First scan the tree rooted at a base directory, then
 487                  * build a new database and finally move it into place.
 488                  * Ignore zero-length directories and strip trailing
 489                  * slashes.
 490                  */
 491                 for (j = 0; j < conf.manpath.sz; j++) {
 492                         sz = strlen(conf.manpath.paths[j]);
 493                         if (sz && conf.manpath.paths[j][sz - 1] == '/')
 494                                 conf.manpath.paths[j][--sz] = '\0';
 495                         if (0 == sz)
 496                                 continue;
 497
 498                         if (j) {
 499                                 mandoc_ohash_init(&mpages, 6,
 500                                     offsetof(struct mpage, inodev));
 501                                 mandoc_ohash_init(&mlinks, 6,
 502                                     offsetof(struct mlink, file));
 503                         }
 504
 505                         if ( ! set_basedir(conf.manpath.paths[j], argc > 0))
 506                                 continue;
 507                         if (0 == treescan())
 508                                 continue;
 509                         dba = dba_new(128);
 510                         mpages_merge(dba, mp);
 511                         if (nodb == 0)
 512                                 dbwrite(dba);
 513                         dba_free(dba);
 514
 515                         if (j + 1 < conf.manpath.sz) {
 516                                 mpages_free();
 517                                 ohash_delete(&mpages);
 518                                 ohash_delete(&mlinks);
 519                         }
 520                 }
 521         }
 522 out:
 523         manconf_free(&conf);
 524         mparse_free(mp);
 525         mchars_free();
 526         mpages_free();
 527         ohash_delete(&mpages);
 528         ohash_delete(&mlinks);
 529         return exitcode;
 530 usage:
 531         progname = getprogname();
 532         fprintf(stderr, "usage: %s [-aDnpQ] [-C file] [-Tutf8]\n"
 533                         "       %s [-aDnpQ] [-Tutf8] dir ...\n"
 534                         "       %s [-DnpQ] [-Tutf8] -d dir [file ...]\n"
 535                         "       %s [-Dnp] -u dir [file ...]\n"
 536                         "       %s [-Q] -t file ...\n",
 537                         progname, progname, progname, progname, progname);
 538
 539         return (int)MANDOCLEVEL_BADARG;
 540 }
 541
 542 /*
 543  * To get a singly linked list in alpha order while inserting entries
 544  * at the beginning, process directory entries in reverse alpha order.
 545  */
 546 static int
 547 #if HAVE_FTS_COMPARE_CONST
 548 fts_compare(const FTSENT *const *a, const FTSENT *const *b)
 549 #else
 550 fts_compare(const FTSENT **a, const FTSENT **b)
 551 #endif
 552 {
 553         return -strcmp((*a)->fts_name, (*b)->fts_name);
 554 }
 555
 556 /*
 557  * Scan a directory tree rooted at "basedir" for manpages.
 558  * We use fts(), scanning directory parts along the way for clues to our
 559  * section and architecture.
 560  *
 561  * If use_all has been specified, grok all files.
 562  * If not, sanitise paths to the following:
 563  *
 564  *   [./]man*[/<arch>]/<name>.<section>
 565  *   or
 566  *   [./]cat<section>[/<arch>]/<name>.0
 567  *
 568  * TODO: accommodate for multi-language directories.
 569  */
 570 static int
 571 treescan(void)
 572 {
 573         char             buf[PATH_MAX];
 574         FTS             *f;
 575         FTSENT          *ff;
 576         struct mlink    *mlink;
 577         int              gzip;
 578         enum form        dform;
 579         char            *dsec, *arch, *fsec, *cp;
 580         const char      *path;
 581         const char      *argv[2];
 582
 583         argv[0] = ".";
 584         argv[1] = NULL;
 585
 586         f = fts_open((char * const *)argv, FTS_PHYSICAL | FTS_NOCHDIR,
 587             fts_compare);
 588         if (f == NULL) {
 589                 exitcode = (int)MANDOCLEVEL_SYSERR;
 590                 say("", "&fts_open");
 591                 return 0;
 592         }
 593
 594         dsec = arch = NULL;
 595         dform = FORM_NONE;
 596
 597         while ((ff = fts_read(f)) != NULL) {
 598                 path = ff->fts_path + 2;
 599                 switch (ff->fts_info) {
 600
 601                 /*
 602                  * Symbolic links require various sanity checks,
 603                  * then get handled just like regular files.
 604                  */
 605                 case FTS_SL:
 606                         if (realpath(path, buf) == NULL) {
 607                                 if (warnings)
 608                                         say(path, "&realpath");
 609                                 continue;
 610                         }
 611                         if (strstr(buf, basedir) != buf
 612 #ifdef HOMEBREWDIR
 613                             && strstr(buf, HOMEBREWDIR) != buf
 614 #endif
 615                         ) {
 616                                 if (warnings) say("",
 617                                     "%s: outside base directory", buf);
 618                                 continue;
 619                         }
 620                         /* Use logical inode to avoid mpages dupe. */
 621                         if (stat(path, ff->fts_statp) == -1) {
 622                                 if (warnings)
 623                                         say(path, "&stat");
 624                                 continue;
 625                         }
 626                         /* FALLTHROUGH */
 627
 628                 /*
 629                  * If we're a regular file, add an mlink by using the
 630                  * stored directory data and handling the filename.
 631                  */
 632                 case FTS_F:
 633                         if ( ! strcmp(path, MANDOC_DB))
 634                                 continue;
 635                         if ( ! use_all && ff->fts_level < 2) {
 636                                 if (warnings)
 637                                         say(path, "Extraneous file");
 638                                 continue;
 639                         }
 640                         gzip = 0;
 641                         fsec = NULL;
 642                         while (fsec == NULL) {
 643                                 fsec = strrchr(ff->fts_name, '.');
 644                                 if (fsec == NULL || strcmp(fsec+1, "gz"))
 645                                         break;
 646                                 gzip = 1;
 647                                 *fsec = '\0';
 648                                 fsec = NULL;
 649                         }
 650                         if (fsec == NULL) {
 651                                 if ( ! use_all) {
 652                                         if (warnings)
 653                                                 say(path,
 654                                                     "No filename suffix");
 655                                         continue;
 656                                 }
 657                         } else if ( ! strcmp(++fsec, "html")) {
 658                                 if (warnings)
 659                                         say(path, "Skip html");
 660                                 continue;
 661                         } else if ( ! strcmp(fsec, "ps")) {
 662                                 if (warnings)
 663                                         say(path, "Skip ps");
 664                                 continue;
 665                         } else if ( ! strcmp(fsec, "pdf")) {
 666                                 if (warnings)
 667                                         say(path, "Skip pdf");
 668                                 continue;
 669                         } else if ( ! use_all &&
 670                             ((dform == FORM_SRC &&
 671                               strncmp(fsec, dsec, strlen(dsec))) ||
 672                              (dform == FORM_CAT && strcmp(fsec, "0")))) {
 673                                 if (warnings)
 674                                         say(path, "Wrong filename suffix");
 675                                 continue;
 676                         } else
 677                                 fsec[-1] = '\0';
 678
 679                         mlink = mandoc_calloc(1, sizeof(struct mlink));
 680                         if (strlcpy(mlink->file, path,
 681                             sizeof(mlink->file)) >=
 682                             sizeof(mlink->file)) {
 683                                 say(path, "Filename too long");
 684                                 free(mlink);
 685                                 continue;
 686                         }
 687                         mlink->dform = dform;
 688                         mlink->dsec = dsec;
 689                         mlink->arch = arch;
 690                         mlink->name = ff->fts_name;
 691                         mlink->fsec = fsec;
 692                         mlink->gzip = gzip;
 693                         mlink_add(mlink, ff->fts_statp);
 694                         continue;
 695
 696                 case FTS_D:
 697                 case FTS_DP:
 698                         break;
 699
 700                 default:
 701                         if (warnings)
 702                                 say(path, "Not a regular file");
 703                         continue;
 704                 }
 705
 706                 switch (ff->fts_level) {
 707                 case 0:
 708                         /* Ignore the root directory. */
 709                         break;
 710                 case 1:
 711                         /*
 712                          * This might contain manX/ or catX/.
 713                          * Try to infer this from the name.
 714                          * If we're not in use_all, enforce it.
 715                          */
 716                         cp = ff->fts_name;
 717                         if (ff->fts_info == FTS_DP) {
 718                                 dform = FORM_NONE;
 719                                 dsec = NULL;
 720                                 break;
 721                         }
 722
 723                         if ( ! strncmp(cp, "man", 3)) {
 724                                 dform = FORM_SRC;
 725                                 dsec = cp + 3;
 726                         } else if ( ! strncmp(cp, "cat", 3)) {
 727                                 dform = FORM_CAT;
 728                                 dsec = cp + 3;
 729                         } else {
 730                                 dform = FORM_NONE;
 731                                 dsec = NULL;
 732                         }
 733
 734                         if (dsec != NULL || use_all)
 735                                 break;
 736
 737                         if (warnings)
 738                                 say(path, "Unknown directory part");
 739                         fts_set(f, ff, FTS_SKIP);
 740                         break;
 741                 case 2:
 742                         /*
 743                          * Possibly our architecture.
 744                          * If we're descending, keep tabs on it.
 745                          */
 746                         if (ff->fts_info != FTS_DP && dsec != NULL)
 747                                 arch = ff->fts_name;
 748                         else
 749                                 arch = NULL;
 750                         break;
 751                 default:
 752                         if (ff->fts_info == FTS_DP || use_all)
 753                                 break;
 754                         if (warnings)
 755                                 say(path, "Extraneous directory part");
 756                         fts_set(f, ff, FTS_SKIP);
 757                         break;
 758                 }
 759         }
 760
 761         fts_close(f);
 762         return 1;
 763 }
 764
 765 /*
 766  * Add a file to the mlinks table.
 767  * Do not verify that it's a "valid" looking manpage (we'll do that
 768  * later).
 769  *
 770  * Try to infer the manual section, architecture, and page name from the
 771  * path, assuming it looks like
 772  *
 773  *   [./]man*[/<arch>]/<name>.<section>
 774  *   or
 775  *   [./]cat<section>[/<arch>]/<name>.0
 776  *
 777  * See treescan() for the fts(3) version of this.
 778  */
 779 static void
 780 filescan(const char *file)
 781 {
 782         char             buf[PATH_MAX];
 783         struct stat      st;
 784         struct mlink    *mlink;
 785         char            *p, *start;
 786
 787         assert(use_all);
 788
 789         if (0 == strncmp(file, "./", 2))
 790                 file += 2;
 791
 792         /*
 793          * We have to do lstat(2) before realpath(3) loses
 794          * the information whether this is a symbolic link.
 795          * We need to know that because for symbolic links,
 796          * we want to use the orginal file name, while for
 797          * regular files, we want to use the real path.
 798          */
 799         if (-1 == lstat(file, &st)) {
 800                 exitcode = (int)MANDOCLEVEL_BADARG;
 801                 say(file, "&lstat");
 802                 return;
 803         } else if (0 == ((S_IFREG | S_IFLNK) & st.st_mode)) {
 804                 exitcode = (int)MANDOCLEVEL_BADARG;
 805                 say(file, "Not a regular file");
 806                 return;
 807         }
 808
 809         /*
 810          * We have to resolve the file name to the real path
 811          * in any case for the base directory check.
 812          */
 813         if (NULL == realpath(file, buf)) {
 814                 exitcode = (int)MANDOCLEVEL_BADARG;
 815                 say(file, "&realpath");
 816                 return;
 817         }
 818
 819         if (OP_TEST == op)
 820                 start = buf;
 821         else if (strstr(buf, basedir) == buf)
 822                 start = buf + strlen(basedir);
 823 #ifdef HOMEBREWDIR
 824         else if (strstr(buf, HOMEBREWDIR) == buf)
 825                 start = buf;
 826 #endif
 827         else {
 828                 exitcode = (int)MANDOCLEVEL_BADARG;
 829                 say("", "%s: outside base directory", buf);
 830                 return;
 831         }
 832
 833         /*
 834          * Now we are sure the file is inside our tree.
 835          * If it is a symbolic link, ignore the real path
 836          * and use the original name.
 837          * This implies passing stuff like "cat1/../man1/foo.1"
 838          * on the command line won't work.  So don't do that.
 839          * Note the stat(2) can still fail if the link target
 840          * doesn't exist.
 841          */
 842         if (S_IFLNK & st.st_mode) {
 843                 if (-1 == stat(buf, &st)) {
 844                         exitcode = (int)MANDOCLEVEL_BADARG;
 845                         say(file, "&stat");
 846                         return;
 847                 }
 848                 if (strlcpy(buf, file, sizeof(buf)) >= sizeof(buf)) {
 849                         say(file, "Filename too long");
 850                         return;
 851                 }
 852                 start = buf;
 853                 if (OP_TEST != op && strstr(buf, basedir) == buf)
 854                         start += strlen(basedir);
 855         }
 856
 857         mlink = mandoc_calloc(1, sizeof(struct mlink));
 858         mlink->dform = FORM_NONE;
 859         if (strlcpy(mlink->file, start, sizeof(mlink->file)) >=
 860             sizeof(mlink->file)) {
 861                 say(start, "Filename too long");
 862                 free(mlink);
 863                 return;
 864         }
 865
 866         /*
 867          * In test mode or when the original name is absolute
 868          * but outside our tree, guess the base directory.
 869          */
 870
 871         if (op == OP_TEST || (start == buf && *start == '/')) {
 872                 if (strncmp(buf, "man/", 4) == 0)
 873                         start = buf + 4;
 874                 else if ((start = strstr(buf, "/man/")) != NULL)
 875                         start += 5;
 876                 else
 877                         start = buf;
 878         }
 879
 880         /*
 881          * First try to guess our directory structure.
 882          * If we find a separator, try to look for man* or cat*.
 883          * If we find one of these and what's underneath is a directory,
 884          * assume it's an architecture.
 885          */
 886         if (NULL != (p = strchr(start, '/'))) {
 887                 *p++ = '\0';
 888                 if (0 == strncmp(start, "man", 3)) {
 889                         mlink->dform = FORM_SRC;
 890                         mlink->dsec = start + 3;
 891                 } else if (0 == strncmp(start, "cat", 3)) {
 892                         mlink->dform = FORM_CAT;
 893                         mlink->dsec = start + 3;
 894                 }
 895
 896                 start = p;
 897                 if (NULL != mlink->dsec && NULL != (p = strchr(start, '/'))) {
 898                         *p++ = '\0';
 899                         mlink->arch = start;
 900                         start = p;
 901                 }
 902         }
 903
 904         /*
 905          * Now check the file suffix.
 906          * Suffix of `.0' indicates a catpage, `.1-9' is a manpage.
 907          */
 908         p = strrchr(start, '\0');
 909         while (p-- > start && '/' != *p && '.' != *p)
 910                 /* Loop. */ ;
 911
 912         if ('.' == *p) {
 913                 *p++ = '\0';
 914                 mlink->fsec = p;
 915         }
 916
 917         /*
 918          * Now try to parse the name.
 919          * Use the filename portion of the path.
 920          */
 921         mlink->name = start;
 922         if (NULL != (p = strrchr(start, '/'))) {
 923                 mlink->name = p + 1;
 924                 *p = '\0';
 925         }
 926         mlink_add(mlink, &st);
 927 }
 928
 929 static void
 930 mlink_add(struct mlink *mlink, const struct stat *st)
 931 {
 932         struct inodev    inodev;
 933         struct mpage    *mpage;
 934         unsigned int     slot;
 935
 936         assert(NULL != mlink->file);
 937
 938         mlink->dsec = mandoc_strdup(mlink->dsec ? mlink->dsec : "");
 939         mlink->arch = mandoc_strdup(mlink->arch ? mlink->arch : "");
 940         mlink->name = mandoc_strdup(mlink->name ? mlink->name : "");
 941         mlink->fsec = mandoc_strdup(mlink->fsec ? mlink->fsec : "");
 942
 943         if ('0' == *mlink->fsec) {
 944                 free(mlink->fsec);
 945                 mlink->fsec = mandoc_strdup(mlink->dsec);
 946                 mlink->fform = FORM_CAT;
 947         } else if ('1' <= *mlink->fsec && '9' >= *mlink->fsec)
 948                 mlink->fform = FORM_SRC;
 949         else
 950                 mlink->fform = FORM_NONE;
 951
 952         slot = ohash_qlookup(&mlinks, mlink->file);
 953         assert(NULL == ohash_find(&mlinks, slot));
 954         ohash_insert(&mlinks, slot, mlink);
 955
 956         memset(&inodev, 0, sizeof(inodev));  /* Clear padding. */
 957         inodev.st_ino = st->st_ino;
 958         inodev.st_dev = st->st_dev;
 959         slot = ohash_lookup_memory(&mpages, (char *)&inodev,
 960             sizeof(struct inodev), inodev.st_ino);
 961         mpage = ohash_find(&mpages, slot);
 962         if (NULL == mpage) {
 963                 mpage = mandoc_calloc(1, sizeof(struct mpage));
 964                 mpage->inodev.st_ino = inodev.st_ino;
 965                 mpage->inodev.st_dev = inodev.st_dev;
 966                 mpage->form = FORM_NONE;
 967                 mpage->next = mpage_head;
 968                 mpage_head = mpage;
 969                 ohash_insert(&mpages, slot, mpage);
 970         } else
 971                 mlink->next = mpage->mlinks;
 972         mpage->mlinks = mlink;
 973         mlink->mpage = mpage;
 974 }
 975
 976 static void
 977 mlink_free(struct mlink *mlink)
 978 {
 979
 980         free(mlink->dsec);
 981         free(mlink->arch);
 982         free(mlink->name);
 983         free(mlink->fsec);
 984         free(mlink);
 985 }
 986
 987 static void
 988 mpages_free(void)
 989 {
 990         struct mpage    *mpage;
 991         struct mlink    *mlink;
 992
 993         while ((mpage = mpage_head) != NULL) {
 994                 while ((mlink = mpage->mlinks) != NULL) {
 995                         mpage->mlinks = mlink->next;
 996                         mlink_free(mlink);
 997                 }
 998                 mpage_head = mpage->next;
 999                 free(mpage->sec);
1000                 free(mpage->arch);
1001                 free(mpage->title);
1002                 free(mpage->desc);
1003                 free(mpage);
1004         }
1005 }
1006
1007 /*
1008  * For each mlink to the mpage, check whether the path looks like
1009  * it is formatted, and if it does, check whether a source manual
1010  * exists by the same name, ignoring the suffix.
1011  * If both conditions hold, drop the mlink.
1012  */
1013 static void
1014 mlinks_undupe(struct mpage *mpage)
1015 {
1016         char              buf[PATH_MAX];
1017         struct mlink    **prev;
1018         struct mlink     *mlink;
1019         char             *bufp;
1020
1021         mpage->form = FORM_CAT;
1022         prev = &mpage->mlinks;
1023         while (NULL != (mlink = *prev)) {
1024                 if (FORM_CAT != mlink->dform) {
1025                         mpage->form = FORM_NONE;
1026                         goto nextlink;
1027                 }
1028                 (void)strlcpy(buf, mlink->file, sizeof(buf));
1029                 bufp = strstr(buf, "cat");
1030                 assert(NULL != bufp);
1031                 memcpy(bufp, "man", 3);
1032                 if (NULL != (bufp = strrchr(buf, '.')))
1033                         *++bufp = '\0';
1034                 (void)strlcat(buf, mlink->dsec, sizeof(buf));
1035                 if (NULL == ohash_find(&mlinks,
1036                     ohash_qlookup(&mlinks, buf)))
1037                         goto nextlink;
1038                 if (warnings)
1039                         say(mlink->file, "Man source exists: %s", buf);
1040                 if (use_all)
1041                         goto nextlink;
1042                 *prev = mlink->next;
1043                 mlink_free(mlink);
1044                 continue;
1045 nextlink:
1046                 prev = &(*prev)->next;
1047         }
1048 }
1049
1050 static void
1051 mlink_check(struct mpage *mpage, struct mlink *mlink)
1052 {
1053         struct str      *str;
1054         unsigned int     slot;
1055
1056         /*
1057          * Check whether the manual section given in a file
1058          * agrees with the directory where the file is located.
1059          * Some manuals have suffixes like (3p) on their
1060          * section number either inside the file or in the
1061          * directory name, some are linked into more than one
1062          * section, like encrypt(1) = makekey(8).
1063          */
1064
1065         if (FORM_SRC == mpage->form &&
1066             strcasecmp(mpage->sec, mlink->dsec))
1067                 say(mlink->file, "Section \"%s\" manual in %s directory",
1068                     mpage->sec, mlink->dsec);
1069
1070         /*
1071          * Manual page directories exist for each kernel
1072          * architecture as returned by machine(1).
1073          * However, many manuals only depend on the
1074          * application architecture as returned by arch(1).
1075          * For example, some (2/ARM) manuals are shared
1076          * across the "armish" and "zaurus" kernel
1077          * architectures.
1078          * A few manuals are even shared across completely
1079          * different architectures, for example fdformat(1)
1080          * on amd64, i386, and sparc64.
1081          */
1082
1083         if (strcasecmp(mpage->arch, mlink->arch))
1084                 say(mlink->file, "Architecture \"%s\" manual in "
1085                     "\"%s\" directory", mpage->arch, mlink->arch);
1086
1087         /*
1088          * XXX
1089          * parse_cat() doesn't set NAME_TITLE yet.
1090          */
1091
1092         if (FORM_CAT == mpage->form)
1093                 return;
1094
1095         /*
1096          * Check whether this mlink
1097          * appears as a name in the NAME section.
1098          */
1099
1100         slot = ohash_qlookup(&names, mlink->name);
1101         str = ohash_find(&names, slot);
1102         assert(NULL != str);
1103         if ( ! (NAME_TITLE & str->mask))
1104                 say(mlink->file, "Name missing in NAME section");
1105 }
1106
1107 /*
1108  * Run through the files in the global vector "mpages"
1109  * and add them to the database specified in "basedir".
1110  *
1111  * This handles the parsing scheme itself, using the cues of directory
1112  * and filename to determine whether the file is parsable or not.
1113  */
1114 static void
1115 mpages_merge(struct dba *dba, struct mparse *mp)
1116 {
1117         struct mpage            *mpage, *mpage_dest;
1118         struct mlink            *mlink, *mlink_dest;
1119         struct roff_man         *man;
1120         char                    *sodest;
1121         char                    *cp;
1122         int                      fd;
1123
1124         for (mpage = mpage_head; mpage != NULL; mpage = mpage->next) {
1125                 mlinks_undupe(mpage);
1126                 if ((mlink = mpage->mlinks) == NULL)
1127                         continue;
1128
1129                 name_mask = NAME_MASK;
1130                 mandoc_ohash_init(&names, 4, offsetof(struct str, key));
1131                 mandoc_ohash_init(&strings, 6, offsetof(struct str, key));
1132                 mparse_reset(mp);
1133                 man = NULL;
1134                 sodest = NULL;
1135
1136                 if ((fd = mparse_open(mp, mlink->file)) == -1) {
1137                         say(mlink->file, "&open");
1138                         goto nextpage;
1139                 }
1140
1141                 /*
1142                  * Interpret the file as mdoc(7) or man(7) source
1143                  * code, unless it is known to be formatted.
1144                  */
1145                 if (mlink->dform != FORM_CAT || mlink->fform != FORM_CAT) {
1146                         mparse_readfd(mp, fd, mlink->file);
1147                         close(fd);
1148                         fd = -1;
1149                         mparse_result(mp, &man, &sodest);
1150                 }
1151
1152                 if (sodest != NULL) {
1153                         mlink_dest = ohash_find(&mlinks,
1154                             ohash_qlookup(&mlinks, sodest));
1155                         if (mlink_dest == NULL) {
1156                                 mandoc_asprintf(&cp, "%s.gz", sodest);
1157                                 mlink_dest = ohash_find(&mlinks,
1158                                     ohash_qlookup(&mlinks, cp));
1159                                 free(cp);
1160                         }
1161                         if (mlink_dest != NULL) {
1162
1163                                 /* The .so target exists. */
1164
1165                                 mpage_dest = mlink_dest->mpage;
1166                                 while (1) {
1167                                         mlink->mpage = mpage_dest;
1168
1169                                         /*
1170                                          * If the target was already
1171                                          * processed, add the links
1172                                          * to the database now.
1173                                          * Otherwise, this will
1174                                          * happen when we come
1175                                          * to the target.
1176                                          */
1177
1178                                         if (mpage_dest->dba != NULL)
1179                                                 dbadd_mlink(mlink);
1180
1181                                         if (mlink->next == NULL)
1182                                                 break;
1183                                         mlink = mlink->next;
1184                                 }
1185
1186                                 /* Move all links to the target. */
1187
1188                                 mlink->next = mlink_dest->next;
1189                                 mlink_dest->next = mpage->mlinks;
1190                                 mpage->mlinks = NULL;
1191                         }
1192                         goto nextpage;
1193                 } else if (man != NULL && man->macroset == MACROSET_MDOC) {
1194                         mdoc_validate(man);
1195                         mpage->form = FORM_SRC;
1196                         mpage->sec = man->meta.msec;
1197                         mpage->sec = mandoc_strdup(
1198                             mpage->sec == NULL ? "" : mpage->sec);
1199                         mpage->arch = man->meta.arch;
1200                         mpage->arch = mandoc_strdup(
1201                             mpage->arch == NULL ? "" : mpage->arch);
1202                         mpage->title = mandoc_strdup(man->meta.title);
1203                 } else if (man != NULL && man->macroset == MACROSET_MAN) {
1204                         man_validate(man);
1205                         if (*man->meta.msec != '\0' ||
1206                             *man->meta.title != '\0') {
1207                                 mpage->form = FORM_SRC;
1208                                 mpage->sec = mandoc_strdup(man->meta.msec);
1209                                 mpage->arch = mandoc_strdup(mlink->arch);
1210                                 mpage->title = mandoc_strdup(man->meta.title);
1211                         } else
1212                                 man = NULL;
1213                 }
1214
1215                 assert(mpage->desc == NULL);
1216                 if (man == NULL) {
1217                         mpage->form = FORM_CAT;
1218                         mpage->sec = mandoc_strdup(mlink->dsec);
1219                         mpage->arch = mandoc_strdup(mlink->arch);
1220                         mpage->title = mandoc_strdup(mlink->name);
1221                         parse_cat(mpage, fd);
1222                 } else if (man->macroset == MACROSET_MDOC)
1223                         parse_mdoc(mpage, &man->meta, man->first);
1224                 else
1225                         parse_man(mpage, &man->meta, man->first);
1226                 if (mpage->desc == NULL) {
1227                         mpage->desc = mandoc_strdup(mlink->name);
1228                         if (warnings)
1229                                 say(mlink->file, "No one-line description, "
1230                                     "using filename \"%s\"", mlink->name);
1231                 }
1232
1233                 for (mlink = mpage->mlinks;
1234                      mlink != NULL;
1235                      mlink = mlink->next) {
1236                         putkey(mpage, mlink->name, NAME_FILE);
1237                         if (warnings && !use_all)
1238                                 mlink_check(mpage, mlink);
1239                 }
1240
1241                 dbadd(dba, mpage);
1242
1243 nextpage:
1244                 ohash_delete(&strings);
1245                 ohash_delete(&names);
1246         }
1247 }
1248
1249 static void
1250 parse_cat(struct mpage *mpage, int fd)
1251 {
1252         FILE            *stream;
1253         struct mlink    *mlink;
1254         char            *line, *p, *title, *sec;
1255         size_t           linesz, plen, titlesz;
1256         ssize_t          len;
1257         int              offs;
1258
1259         mlink = mpage->mlinks;
1260         stream = fd == -1 ? fopen(mlink->file, "r") : fdopen(fd, "r");
1261         if (stream == NULL) {
1262                 if (fd != -1)
1263                         close(fd);
1264                 if (warnings)
1265                         say(mlink->file, "&fopen");
1266                 return;
1267         }
1268
1269         line = NULL;
1270         linesz = 0;
1271
1272         /* Parse the section number from the header line. */
1273
1274         while (getline(&line, &linesz, stream) != -1) {
1275                 if (*line == '\n')
1276                         continue;
1277                 if ((sec = strchr(line, '(')) == NULL)
1278                         break;
1279                 if ((p = strchr(++sec, ')')) == NULL)
1280                         break;
1281                 free(mpage->sec);
1282                 mpage->sec = mandoc_strndup(sec, p - sec);
1283                 if (warnings && *mlink->dsec != '\0' &&
1284                     strcasecmp(mpage->sec, mlink->dsec))
1285                         say(mlink->file,
1286                             "Section \"%s\" manual in %s directory",
1287                             mpage->sec, mlink->dsec);
1288                 break;
1289         }
1290
1291         /* Skip to first blank line. */
1292
1293         while (line == NULL || *line != '\n')
1294                 if (getline(&line, &linesz, stream) == -1)
1295                         break;
1296
1297         /*
1298          * Assume the first line that is not indented
1299          * is the first section header.  Skip to it.
1300          */
1301
1302         while (getline(&line, &linesz, stream) != -1)
1303                 if (*line != '\n' && *line != ' ')
1304                         break;
1305
1306         /*
1307          * Read up until the next section into a buffer.
1308          * Strip the leading and trailing newline from each read line,
1309          * appending a trailing space.
1310          * Ignore empty (whitespace-only) lines.
1311          */
1312
1313         titlesz = 0;
1314         title = NULL;
1315
1316         while ((len = getline(&line, &linesz, stream)) != -1) {
1317                 if (*line != ' ')
1318                         break;
1319                 offs = 0;
1320                 while (isspace((unsigned char)line[offs]))
1321                         offs++;
1322                 if (line[offs] == '\0')
1323                         continue;
1324                 title = mandoc_realloc(title, titlesz + len - offs);
1325                 memcpy(title + titlesz, line + offs, len - offs);
1326                 titlesz += len - offs;
1327                 title[titlesz - 1] = ' ';
1328         }
1329         free(line);
1330
1331         /*
1332          * If no page content can be found, or the input line
1333          * is already the next section header, or there is no
1334          * trailing newline, reuse the page title as the page
1335          * description.
1336          */
1337
1338         if (NULL == title || '\0' == *title) {
1339                 if (warnings)
1340                         say(mlink->file, "Cannot find NAME section");
1341                 fclose(stream);
1342                 free(title);
1343                 return;
1344         }
1345
1346         title[titlesz - 1] = '\0';
1347
1348         /*
1349          * Skip to the first dash.
1350          * Use the remaining line as the description (no more than 70
1351          * bytes).
1352          */
1353
1354         if (NULL != (p = strstr(title, "- "))) {
1355                 for (p += 2; ' ' == *p || '\b' == *p; p++)
1356                         /* Skip to next word. */ ;
1357         } else {
1358                 if (warnings)
1359                         say(mlink->file, "No dash in title line, "
1360                             "reusing \"%s\" as one-line description", title);
1361                 p = title;
1362         }
1363
1364         plen = strlen(p);
1365
1366         /* Strip backspace-encoding from line. */
1367
1368         while (NULL != (line = memchr(p, '\b', plen))) {
1369                 len = line - p;
1370                 if (0 == len) {
1371                         memmove(line, line + 1, plen--);
1372                         continue;
1373                 }
1374                 memmove(line - 1, line + 1, plen - len);
1375                 plen -= 2;
1376         }
1377
1378         /*
1379          * Cut off excessive one-line descriptions.
1380          * Bad pages are not worth better heuristics.
1381          */
1382
1383         mpage->desc = mandoc_strndup(p, 150);
1384         fclose(stream);
1385         free(title);
1386 }
1387
1388 /*
1389  * Put a type/word pair into the word database for this particular file.
1390  */
1391 static void
1392 putkey(const struct mpage *mpage, char *value, uint64_t type)
1393 {
1394         putkeys(mpage, value, strlen(value), type);
1395 }
1396
1397 /*
1398  * Grok all nodes at or below a certain mdoc node into putkey().
1399  */
1400 static void
1401 putmdockey(const struct mpage *mpage,
1402         const struct roff_node *n, uint64_t m, int taboo)
1403 {
1404
1405         for ( ; NULL != n; n = n->next) {
1406                 if (n->flags & taboo)
1407                         continue;
1408                 if (NULL != n->child)
1409                         putmdockey(mpage, n->child, m, taboo);
1410                 if (n->type == ROFFT_TEXT)
1411                         putkey(mpage, n->string, m);
1412         }
1413 }
1414
1415 static void
1416 parse_man(struct mpage *mpage, const struct roff_meta *meta,
1417         const struct roff_node *n)
1418 {
1419         const struct roff_node *head, *body;
1420         char            *start, *title;
1421         char             byte;
1422         size_t           sz;
1423
1424         if (n == NULL)
1425                 return;
1426
1427         /*
1428          * We're only searching for one thing: the first text child in
1429          * the BODY of a NAME section.  Since we don't keep track of
1430          * sections in -man, run some hoops to find out whether we're in
1431          * the correct section or not.
1432          */
1433
1434         if (n->type == ROFFT_BODY && n->tok == MAN_SH) {
1435                 body = n;
1436                 if ((head = body->parent->head) != NULL &&
1437                     (head = head->child) != NULL &&
1438                     head->next == NULL &&
1439                     head->type == ROFFT_TEXT &&
1440                     strcmp(head->string, "NAME") == 0 &&
1441                     body->child != NULL) {
1442
1443                         /*
1444                          * Suck the entire NAME section into memory.
1445                          * Yes, we might run away.
1446                          * But too many manuals have big, spread-out
1447                          * NAME sections over many lines.
1448                          */
1449
1450                         title = NULL;
1451                         deroff(&title, body);
1452                         if (NULL == title)
1453                                 return;
1454
1455                         /*
1456                          * Go through a special heuristic dance here.
1457                          * Conventionally, one or more manual names are
1458                          * comma-specified prior to a whitespace, then a
1459                          * dash, then a description.  Try to puzzle out
1460                          * the name parts here.
1461                          */
1462
1463                         start = title;
1464                         for ( ;; ) {
1465                                 sz = strcspn(start, " ,");
1466                                 if ('\0' == start[sz])
1467                                         break;
1468
1469                                 byte = start[sz];
1470                                 start[sz] = '\0';
1471
1472                                 /*
1473                                  * Assume a stray trailing comma in the
1474                                  * name list if a name begins with a dash.
1475                                  */
1476
1477                                 if ('-' == start[0] ||
1478                                     ('\\' == start[0] && '-' == start[1]))
1479                                         break;
1480
1481                                 putkey(mpage, start, NAME_TITLE);
1482                                 if ( ! (mpage->name_head_done ||
1483                                     strcasecmp(start, meta->title))) {
1484                                         putkey(mpage, start, NAME_HEAD);
1485                                         mpage->name_head_done = 1;
1486                                 }
1487
1488                                 if (' ' == byte) {
1489                                         start += sz + 1;
1490                                         break;
1491                                 }
1492
1493                                 assert(',' == byte);
1494                                 start += sz + 1;
1495                                 while (' ' == *start)
1496                                         start++;
1497                         }
1498
1499                         if (start == title) {
1500                                 putkey(mpage, start, NAME_TITLE);
1501                                 if ( ! (mpage->name_head_done ||
1502                                     strcasecmp(start, meta->title))) {
1503                                         putkey(mpage, start, NAME_HEAD);
1504                                         mpage->name_head_done = 1;
1505                                 }
1506                                 free(title);
1507                                 return;
1508                         }
1509
1510                         while (isspace((unsigned char)*start))
1511                                 start++;
1512
1513                         if (0 == strncmp(start, "-", 1))
1514                                 start += 1;
1515                         else if (0 == strncmp(start, "\\-\\-", 4))
1516                                 start += 4;
1517                         else if (0 == strncmp(start, "\\-", 2))
1518                                 start += 2;
1519                         else if (0 == strncmp(start, "\\(en", 4))
1520                                 start += 4;
1521                         else if (0 == strncmp(start, "\\(em", 4))
1522                                 start += 4;
1523
1524                         while (' ' == *start)
1525                                 start++;
1526
1527                         /*
1528                          * Cut off excessive one-line descriptions.
1529                          * Bad pages are not worth better heuristics.
1530                          */
1531
1532                         mpage->desc = mandoc_strndup(start, 150);
1533                         free(title);
1534                         return;
1535                 }
1536         }
1537
1538         for (n = n->child; n; n = n->next) {
1539                 if (NULL != mpage->desc)
1540                         break;
1541                 parse_man(mpage, meta, n);
1542         }
1543 }
1544
1545 static void
1546 parse_mdoc(struct mpage *mpage, const struct roff_meta *meta,
1547         const struct roff_node *n)
1548 {
1549
1550         for (n = n->child; n != NULL; n = n->next) {
1551                 if (n->tok == TOKEN_NONE ||
1552                     n->tok < ROFF_MAX ||
1553                     n->flags & mdocs[n->tok].taboo)
1554                         continue;
1555                 assert(n->tok >= MDOC_Dd && n->tok < MDOC_MAX);
1556                 switch (n->type) {
1557                 case ROFFT_ELEM:
1558                 case ROFFT_BLOCK:
1559                 case ROFFT_HEAD:
1560                 case ROFFT_BODY:
1561                 case ROFFT_TAIL:
1562                         if (mdocs[n->tok].fp != NULL &&
1563                             (*mdocs[n->tok].fp)(mpage, meta, n) == 0)
1564                                 break;
1565                         if (mdocs[n->tok].mask)
1566                                 putmdockey(mpage, n->child,
1567                                     mdocs[n->tok].mask, mdocs[n->tok].taboo);
1568                         break;
1569                 default:
1570                         continue;
1571                 }
1572                 if (NULL != n->child)
1573                         parse_mdoc(mpage, meta, n);
1574         }
1575 }
1576
1577 static int
1578 parse_mdoc_Fa(struct mpage *mpage, const struct roff_meta *meta,
1579         const struct roff_node *n)
1580 {
1581         uint64_t mask;
1582
1583         mask = TYPE_Fa;
1584         if (n->sec == SEC_SYNOPSIS)
1585                 mask |= TYPE_Vt;
1586
1587         putmdockey(mpage, n->child, mask, 0);
1588         return 0;
1589 }
1590
1591 static int
1592 parse_mdoc_Fd(struct mpage *mpage, const struct roff_meta *meta,
1593         const struct roff_node *n)
1594 {
1595         char            *start, *end;
1596         size_t           sz;
1597
1598         if (SEC_SYNOPSIS != n->sec ||
1599             NULL == (n = n->child) ||
1600             n->type != ROFFT_TEXT)
1601                 return 0;
1602
1603         /*
1604          * Only consider those `Fd' macro fields that begin with an
1605          * "inclusion" token (versus, e.g., #define).
1606          */
1607
1608         if (strcmp("#include", n->string))
1609                 return 0;
1610
1611         if ((n = n->next) == NULL || n->type != ROFFT_TEXT)
1612                 return 0;
1613
1614         /*
1615          * Strip away the enclosing angle brackets and make sure we're
1616          * not zero-length.
1617          */
1618
1619         start = n->string;
1620         if ('<' == *start || '"' == *start)
1621                 start++;
1622
1623         if (0 == (sz = strlen(start)))
1624                 return 0;
1625
1626         end = &start[(int)sz - 1];
1627         if ('>' == *end || '"' == *end)
1628                 end--;
1629
1630         if (end > start)
1631                 putkeys(mpage, start, end - start + 1, TYPE_In);
1632         return 0;
1633 }
1634
1635 static void
1636 parse_mdoc_fname(struct mpage *mpage, const struct roff_node *n)
1637 {
1638         char    *cp;
1639         size_t   sz;
1640
1641         if (n->type != ROFFT_TEXT)
1642                 return;
1643
1644         /* Skip function pointer punctuation. */
1645
1646         cp = n->string;
1647         while (*cp == '(' || *cp == '*')
1648                 cp++;
1649         sz = strcspn(cp, "()");
1650
1651         putkeys(mpage, cp, sz, TYPE_Fn);
1652         if (n->sec == SEC_SYNOPSIS)
1653                 putkeys(mpage, cp, sz, NAME_SYN);
1654 }
1655
1656 static int
1657 parse_mdoc_Fn(struct mpage *mpage, const struct roff_meta *meta,
1658         const struct roff_node *n)
1659 {
1660         uint64_t mask;
1661
1662         if (n->child == NULL)
1663                 return 0;
1664
1665         parse_mdoc_fname(mpage, n->child);
1666
1667         n = n->child->next;
1668         if (n != NULL && n->type == ROFFT_TEXT) {
1669                 mask = TYPE_Fa;
1670                 if (n->sec == SEC_SYNOPSIS)
1671                         mask |= TYPE_Vt;
1672                 putmdockey(mpage, n, mask, 0);
1673         }
1674
1675         return 0;
1676 }
1677
1678 static int
1679 parse_mdoc_Fo(struct mpage *mpage, const struct roff_meta *meta,
1680         const struct roff_node *n)
1681 {
1682
1683         if (n->type != ROFFT_HEAD)
1684                 return 1;
1685
1686         if (n->child != NULL)
1687                 parse_mdoc_fname(mpage, n->child);
1688
1689         return 0;
1690 }
1691
1692 static int
1693 parse_mdoc_Va(struct mpage *mpage, const struct roff_meta *meta,
1694         const struct roff_node *n)
1695 {
1696         char *cp;
1697
1698         if (n->type != ROFFT_ELEM && n->type != ROFFT_BODY)
1699                 return 0;
1700
1701         if (n->child != NULL &&
1702             n->child->next == NULL &&
1703             n->child->type == ROFFT_TEXT)
1704                 return 1;
1705
1706         cp = NULL;
1707         deroff(&cp, n);
1708         if (cp != NULL) {
1709                 putkey(mpage, cp, TYPE_Vt | (n->tok == MDOC_Va ||
1710                     n->type == ROFFT_BODY ? TYPE_Va : 0));
1711                 free(cp);
1712         }
1713
1714         return 0;
1715 }
1716
1717 static int
1718 parse_mdoc_Xr(struct mpage *mpage, const struct roff_meta *meta,
1719         const struct roff_node *n)
1720 {
1721         char    *cp;
1722
1723         if (NULL == (n = n->child))
1724                 return 0;
1725
1726         if (NULL == n->next) {
1727                 putkey(mpage, n->string, TYPE_Xr);
1728                 return 0;
1729         }
1730
1731         mandoc_asprintf(&cp, "%s(%s)", n->string, n->next->string);
1732         putkey(mpage, cp, TYPE_Xr);
1733         free(cp);
1734         return 0;
1735 }
1736
1737 static int
1738 parse_mdoc_Nd(struct mpage *mpage, const struct roff_meta *meta,
1739         const struct roff_node *n)
1740 {
1741
1742         if (n->type == ROFFT_BODY)
1743                 deroff(&mpage->desc, n);
1744         return 0;
1745 }
1746
1747 static int
1748 parse_mdoc_Nm(struct mpage *mpage, const struct roff_meta *meta,
1749         const struct roff_node *n)
1750 {
1751
1752         if (SEC_NAME == n->sec)
1753                 putmdockey(mpage, n->child, NAME_TITLE, 0);
1754         else if (n->sec == SEC_SYNOPSIS && n->type == ROFFT_HEAD) {
1755                 if (n->child == NULL)
1756                         putkey(mpage, meta->name, NAME_SYN);
1757                 else
1758                         putmdockey(mpage, n->child, NAME_SYN, 0);
1759         }
1760         if ( ! (mpage->name_head_done ||
1761             n->child == NULL || n->child->string == NULL ||
1762             strcasecmp(n->child->string, meta->title))) {
1763                 putkey(mpage, n->child->string, NAME_HEAD);
1764                 mpage->name_head_done = 1;
1765         }
1766         return 0;
1767 }
1768
1769 static int
1770 parse_mdoc_Sh(struct mpage *mpage, const struct roff_meta *meta,
1771         const struct roff_node *n)
1772 {
1773
1774         return n->sec == SEC_CUSTOM && n->type == ROFFT_HEAD;
1775 }
1776
1777 static int
1778 parse_mdoc_head(struct mpage *mpage, const struct roff_meta *meta,
1779         const struct roff_node *n)
1780 {
1781
1782         return n->type == ROFFT_HEAD;
1783 }
1784
1785 /*
1786  * Add a string to the hash table for the current manual.
1787  * Each string has a bitmask telling which macros it belongs to.
1788  * When we finish the manual, we'll dump the table.
1789  */
1790 static void
1791 putkeys(const struct mpage *mpage, char *cp, size_t sz, uint64_t v)
1792 {
1793         struct ohash    *htab;
1794         struct str      *s;
1795         const char      *end;
1796         unsigned int     slot;
1797         int              i, mustfree;
1798
1799         if (0 == sz)
1800                 return;
1801
1802         mustfree = render_string(&cp, &sz);
1803
1804         if (TYPE_Nm & v) {
1805                 htab = &names;
1806                 v &= name_mask;
1807                 if (v & NAME_FIRST)
1808                         name_mask &= ~NAME_FIRST;
1809                 if (debug > 1)
1810                         say(mpage->mlinks->file,
1811                             "Adding name %*s, bits=0x%llx", (int)sz, cp,
1812                             (unsigned long long)v);
1813         } else {
1814                 htab = &strings;
1815                 if (debug > 1)
1816                     for (i = 0; i < KEY_MAX; i++)
1817                         if ((uint64_t)1 << i & v)
1818                             say(mpage->mlinks->file,
1819                                 "Adding key %s=%*s",
1820                                 mansearch_keynames[i], (int)sz, cp);
1821         }
1822
1823         end = cp + sz;
1824         slot = ohash_qlookupi(htab, cp, &end);
1825         s = ohash_find(htab, slot);
1826
1827         if (NULL != s && mpage == s->mpage) {
1828                 s->mask |= v;
1829                 return;
1830         } else if (NULL == s) {
1831                 s = mandoc_calloc(1, sizeof(struct str) + sz + 1);
1832                 memcpy(s->key, cp, sz);
1833                 ohash_insert(htab, slot, s);
1834         }
1835         s->mpage = mpage;
1836         s->mask = v;
1837
1838         if (mustfree)
1839                 free(cp);
1840 }
1841
1842 /*
1843  * Take a Unicode codepoint and produce its UTF-8 encoding.
1844  * This isn't the best way to do this, but it works.
1845  * The magic numbers are from the UTF-8 packaging.
1846  * They're not as scary as they seem: read the UTF-8 spec for details.
1847  */
1848 static size_t
1849 utf8(unsigned int cp, char out[7])
1850 {
1851         size_t           rc;
1852
1853         rc = 0;
1854         if (cp <= 0x0000007F) {
1855                 rc = 1;
1856                 out[0] = (char)cp;
1857         } else if (cp <= 0x000007FF) {
1858                 rc = 2;
1859                 out[0] = (cp >> 6  & 31) | 192;
1860                 out[1] = (cp       & 63) | 128;
1861         } else if (cp <= 0x0000FFFF) {
1862                 rc = 3;
1863                 out[0] = (cp >> 12 & 15) | 224;
1864                 out[1] = (cp >> 6  & 63) | 128;
1865                 out[2] = (cp       & 63) | 128;
1866         } else if (cp <= 0x001FFFFF) {
1867                 rc = 4;
1868                 out[0] = (cp >> 18 &  7) | 240;
1869                 out[1] = (cp >> 12 & 63) | 128;
1870                 out[2] = (cp >> 6  & 63) | 128;
1871                 out[3] = (cp       & 63) | 128;
1872         } else if (cp <= 0x03FFFFFF) {
1873                 rc = 5;
1874                 out[0] = (cp >> 24 &  3) | 248;
1875                 out[1] = (cp >> 18 & 63) | 128;
1876                 out[2] = (cp >> 12 & 63) | 128;
1877                 out[3] = (cp >> 6  & 63) | 128;
1878                 out[4] = (cp       & 63) | 128;
1879         } else if (cp <= 0x7FFFFFFF) {
1880                 rc = 6;
1881                 out[0] = (cp >> 30 &  1) | 252;
1882                 out[1] = (cp >> 24 & 63) | 128;
1883                 out[2] = (cp >> 18 & 63) | 128;
1884                 out[3] = (cp >> 12 & 63) | 128;
1885                 out[4] = (cp >> 6  & 63) | 128;
1886                 out[5] = (cp       & 63) | 128;
1887         } else
1888                 return 0;
1889
1890         out[rc] = '\0';
1891         return rc;
1892 }
1893
1894 /*
1895  * If the string contains escape sequences,
1896  * replace it with an allocated rendering and return 1,
1897  * such that the caller can free it after use.
1898  * Otherwise, do nothing and return 0.
1899  */
1900 static int
1901 render_string(char **public, size_t *psz)
1902 {
1903         const char      *src, *scp, *addcp, *seq;
1904         char            *dst;
1905         size_t           ssz, dsz, addsz;
1906         char             utfbuf[7], res[6];
1907         int              seqlen, unicode;
1908
1909         res[0] = '\\';
1910         res[1] = '\t';
1911         res[2] = ASCII_NBRSP;
1912         res[3] = ASCII_HYPH;
1913         res[4] = ASCII_BREAK;
1914         res[5] = '\0';
1915
1916         src = scp = *public;
1917         ssz = *psz;
1918         dst = NULL;
1919         dsz = 0;
1920
1921         while (scp < src + *psz) {
1922
1923                 /* Leave normal characters unchanged. */
1924
1925                 if (strchr(res, *scp) == NULL) {
1926                         if (dst != NULL)
1927                                 dst[dsz++] = *scp;
1928                         scp++;
1929                         continue;
1930                 }
1931
1932                 /*
1933                  * Found something that requires replacing,
1934                  * make sure we have a destination buffer.
1935                  */
1936
1937                 if (dst == NULL) {
1938                         dst = mandoc_malloc(ssz + 1);
1939                         dsz = scp - src;
1940                         memcpy(dst, src, dsz);
1941                 }
1942
1943                 /* Handle single-char special characters. */
1944
1945                 switch (*scp) {
1946                 case '\\':
1947                         break;
1948                 case '\t':
1949                 case ASCII_NBRSP:
1950                         dst[dsz++] = ' ';
1951                         scp++;
1952                         continue;
1953                 case ASCII_HYPH:
1954                         dst[dsz++] = '-';
1955                         /* FALLTHROUGH */
1956                 case ASCII_BREAK:
1957                         scp++;
1958                         continue;
1959                 default:
1960                         abort();
1961                 }
1962
1963                 /*
1964                  * Found an escape sequence.
1965                  * Read past the slash, then parse it.
1966                  * Ignore everything except characters.
1967                  */
1968
1969                 scp++;
1970                 if (mandoc_escape(&scp, &seq, &seqlen) != ESCAPE_SPECIAL)
1971                         continue;
1972
1973                 /*
1974                  * Render the special character
1975                  * as either UTF-8 or ASCII.
1976                  */
1977
1978                 if (write_utf8) {
1979                         unicode = mchars_spec2cp(seq, seqlen);
1980                         if (unicode <= 0)
1981                                 continue;
1982                         addsz = utf8(unicode, utfbuf);
1983                         if (addsz == 0)
1984                                 continue;
1985                         addcp = utfbuf;
1986                 } else {
1987                         addcp = mchars_spec2str(seq, seqlen, &addsz);
1988                         if (addcp == NULL)
1989                                 continue;
1990                         if (*addcp == ASCII_NBRSP) {
1991                                 addcp = " ";
1992                                 addsz = 1;
1993                         }
1994                 }
1995
1996                 /* Copy the rendered glyph into the stream. */
1997
1998                 ssz += addsz;
1999                 dst = mandoc_realloc(dst, ssz + 1);
2000                 memcpy(dst + dsz, addcp, addsz);
2001                 dsz += addsz;
2002         }
2003         if (dst != NULL) {
2004                 *public = dst;
2005                 *psz = dsz;
2006         }
2007
2008         /* Trim trailing whitespace and NUL-terminate. */
2009
2010         while (*psz > 0 && (*public)[*psz - 1] == ' ')
2011                 --*psz;
2012         if (dst != NULL) {
2013                 (*public)[*psz] = '\0';
2014                 return 1;
2015         } else
2016                 return 0;
2017 }
2018
2019 static void
2020 dbadd_mlink(const struct mlink *mlink)
2021 {
2022         dba_page_alias(mlink->mpage->dba, mlink->name, NAME_FILE);
2023         dba_page_add(mlink->mpage->dba, DBP_SECT, mlink->dsec);
2024         dba_page_add(mlink->mpage->dba, DBP_SECT, mlink->fsec);
2025         dba_page_add(mlink->mpage->dba, DBP_ARCH, mlink->arch);
2026         dba_page_add(mlink->mpage->dba, DBP_FILE, mlink->file);
2027 }
2028
2029 /*
2030  * Flush the current page's terms (and their bits) into the database.
2031  * Also, handle escape sequences at the last possible moment.
2032  */
2033 static void
2034 dbadd(struct dba *dba, struct mpage *mpage)
2035 {
2036         struct mlink    *mlink;
2037         struct str      *key;
2038         char            *cp;
2039         uint64_t         mask;
2040         size_t           i;
2041         unsigned int     slot;
2042         int              mustfree;
2043
2044         mlink = mpage->mlinks;
2045
2046         if (nodb) {
2047                 for (key = ohash_first(&names, &slot); NULL != key;
2048                      key = ohash_next(&names, &slot))
2049                         free(key);
2050                 for (key = ohash_first(&strings, &slot); NULL != key;
2051                      key = ohash_next(&strings, &slot))
2052                         free(key);
2053                 if (0 == debug)
2054                         return;
2055                 while (NULL != mlink) {
2056                         fputs(mlink->name, stdout);
2057                         if (NULL == mlink->next ||
2058                             strcmp(mlink->dsec, mlink->next->dsec) ||
2059                             strcmp(mlink->fsec, mlink->next->fsec) ||
2060                             strcmp(mlink->arch, mlink->next->arch)) {
2061                                 putchar('(');
2062                                 if ('\0' == *mlink->dsec)
2063                                         fputs(mlink->fsec, stdout);
2064                                 else
2065                                         fputs(mlink->dsec, stdout);
2066                                 if ('\0' != *mlink->arch)
2067                                         printf("/%s", mlink->arch);
2068                                 putchar(')');
2069                         }
2070                         mlink = mlink->next;
2071                         if (NULL != mlink)
2072                                 fputs(", ", stdout);
2073                 }
2074                 printf(" - %s\n", mpage->desc);
2075                 return;
2076         }
2077
2078         if (debug)
2079                 say(mlink->file, "Adding to database");
2080
2081         cp = mpage->desc;
2082         i = strlen(cp);
2083         mustfree = render_string(&cp, &i);
2084         mpage->dba = dba_page_new(dba->pages,
2085             *mpage->arch == '\0' ? mlink->arch : mpage->arch,
2086             cp, mlink->file, mpage->form);
2087         if (mustfree)
2088                 free(cp);
2089         dba_page_add(mpage->dba, DBP_SECT, mpage->sec);
2090
2091         while (mlink != NULL) {
2092                 dbadd_mlink(mlink);
2093                 mlink = mlink->next;
2094         }
2095
2096         for (key = ohash_first(&names, &slot); NULL != key;
2097              key = ohash_next(&names, &slot)) {
2098                 assert(key->mpage == mpage);
2099                 dba_page_alias(mpage->dba, key->key, key->mask);
2100                 free(key);
2101         }
2102         for (key = ohash_first(&strings, &slot); NULL != key;
2103              key = ohash_next(&strings, &slot)) {
2104                 assert(key->mpage == mpage);
2105                 i = 0;
2106                 for (mask = TYPE_Xr; mask <= TYPE_Lb; mask *= 2) {
2107                         if (key->mask & mask)
2108                                 dba_macro_add(dba->macros, i,
2109                                     key->key, mpage->dba);
2110                         i++;
2111                 }
2112                 free(key);
2113         }
2114 }
2115
2116 static void
2117 dbprune(struct dba *dba)
2118 {
2119         struct dba_array        *page, *files;
2120         char                    *file;
2121
2122         dba_array_FOREACH(dba->pages, page) {
2123                 files = dba_array_get(page, DBP_FILE);
2124                 dba_array_FOREACH(files, file) {
2125                         if (*file < ' ')
2126                                 file++;
2127                         if (ohash_find(&mlinks, ohash_qlookup(&mlinks,
2128                             file)) != NULL) {
2129                                 if (debug)
2130                                         say(file, "Deleting from database");
2131                                 dba_array_del(dba->pages);
2132                                 break;
2133                         }
2134                 }
2135         }
2136 }
2137
2138 /*
2139  * Write the database from memory to disk.
2140  */
2141 static void
2142 dbwrite(struct dba *dba)
2143 {
2144         struct stat      sb1, sb2;
2145         char             tfn[33], *cp1, *cp2;
2146         off_t            i;
2147         int              fd1, fd2;
2148
2149         /*
2150          * Do not write empty databases, and delete existing ones
2151          * when makewhatis -u causes them to become empty.
2152          */
2153
2154         dba_array_start(dba->pages);
2155         if (dba_array_next(dba->pages) == NULL) {
2156                 if (unlink(MANDOC_DB) == -1 && errno != ENOENT)
2157                         say(MANDOC_DB, "&unlink");
2158                 return;
2159         }
2160
2161         /*
2162          * Build the database in a temporary file,
2163          * then atomically move it into place.
2164          */
2165
2166         if (dba_write(MANDOC_DB "~", dba) != -1) {
2167                 if (rename(MANDOC_DB "~", MANDOC_DB) == -1) {
2168                         exitcode = (int)MANDOCLEVEL_SYSERR;
2169                         say(MANDOC_DB, "&rename");
2170                         unlink(MANDOC_DB "~");
2171                 }
2172                 return;
2173         }
2174
2175         /*
2176          * We lack write permission and cannot replace the database
2177          * file, but let's at least check whether the data changed.
2178          */
2179
2180         (void)strlcpy(tfn, "/tmp/mandocdb.XXXXXXXX", sizeof(tfn));
2181         if (mkdtemp(tfn) == NULL) {
2182                 exitcode = (int)MANDOCLEVEL_SYSERR;
2183                 say("", "&%s", tfn);
2184                 return;
2185         }
2186         cp1 = cp2 = MAP_FAILED;
2187         fd1 = fd2 = -1;
2188         (void)strlcat(tfn, "/" MANDOC_DB, sizeof(tfn));
2189         if (dba_write(tfn, dba) == -1) {
2190                 say(tfn, "&dba_write");
2191                 goto err;
2192         }
2193         if ((fd1 = open(MANDOC_DB, O_RDONLY, 0)) == -1) {
2194                 say(MANDOC_DB, "&open");
2195                 goto err;
2196         }
2197         if ((fd2 = open(tfn, O_RDONLY, 0)) == -1) {
2198                 say(tfn, "&open");
2199                 goto err;
2200         }
2201         if (fstat(fd1, &sb1) == -1) {
2202                 say(MANDOC_DB, "&fstat");
2203                 goto err;
2204         }
2205         if (fstat(fd2, &sb2) == -1) {
2206                 say(tfn, "&fstat");
2207                 goto err;
2208         }
2209         if (sb1.st_size != sb2.st_size)
2210                 goto err;
2211         if ((cp1 = mmap(NULL, sb1.st_size, PROT_READ, MAP_PRIVATE,
2212             fd1, 0)) == MAP_FAILED) {
2213                 say(MANDOC_DB, "&mmap");
2214                 goto err;
2215         }
2216         if ((cp2 = mmap(NULL, sb2.st_size, PROT_READ, MAP_PRIVATE,
2217             fd2, 0)) == MAP_FAILED) {
2218                 say(tfn, "&mmap");
2219                 goto err;
2220         }
2221         for (i = 0; i < sb1.st_size; i++)
2222                 if (cp1[i] != cp2[i])
2223                         goto err;
2224         goto out;
2225
2226 err:
2227         exitcode = (int)MANDOCLEVEL_SYSERR;
2228         say(MANDOC_DB, "Data changed, but cannot replace database");
2229
2230 out:
2231         if (cp1 != MAP_FAILED)
2232                 munmap(cp1, sb1.st_size);
2233         if (cp2 != MAP_FAILED)
2234                 munmap(cp2, sb2.st_size);
2235         if (fd1 != -1)
2236                 close(fd1);
2237         if (fd2 != -1)
2238                 close(fd2);
2239         unlink(tfn);
2240         *strrchr(tfn, '/') = '\0';
2241         rmdir(tfn);
2242 }
2243
2244 static int
2245 set_basedir(const char *targetdir, int report_baddir)
2246 {
2247         static char      startdir[PATH_MAX];
2248         static int       getcwd_status;  /* 1 = ok, 2 = failure */
2249         static int       chdir_status;  /* 1 = changed directory */
2250         char            *cp;
2251
2252         /*
2253          * Remember the original working directory, if possible.
2254          * This will be needed if the second or a later directory
2255          * on the command line is given as a relative path.
2256          * Do not error out if the current directory is not
2257          * searchable: Maybe it won't be needed after all.
2258          */
2259         if (0 == getcwd_status) {
2260                 if (NULL == getcwd(startdir, sizeof(startdir))) {
2261                         getcwd_status = 2;
2262                         (void)strlcpy(startdir, strerror(errno),
2263                             sizeof(startdir));
2264                 } else
2265                         getcwd_status = 1;
2266         }
2267
2268         /*
2269          * We are leaving the old base directory.
2270          * Do not use it any longer, not even for messages.
2271          */
2272         *basedir = '\0';
2273
2274         /*
2275          * If and only if the directory was changed earlier and
2276          * the next directory to process is given as a relative path,
2277          * first go back, or bail out if that is impossible.
2278          */
2279         if (chdir_status && '/' != *targetdir) {
2280                 if (2 == getcwd_status) {
2281                         exitcode = (int)MANDOCLEVEL_SYSERR;
2282                         say("", "getcwd: %s", startdir);
2283                         return 0;
2284                 }
2285                 if (-1 == chdir(startdir)) {
2286                         exitcode = (int)MANDOCLEVEL_SYSERR;
2287                         say("", "&chdir %s", startdir);
2288                         return 0;
2289                 }
2290         }
2291
2292         /*
2293          * Always resolve basedir to the canonicalized absolute
2294          * pathname and append a trailing slash, such that
2295          * we can reliably check whether files are inside.
2296          */
2297         if (NULL == realpath(targetdir, basedir)) {
2298                 if (report_baddir || errno != ENOENT) {
2299                         exitcode = (int)MANDOCLEVEL_BADARG;
2300                         say("", "&%s: realpath", targetdir);
2301                 }
2302                 return 0;
2303         } else if (-1 == chdir(basedir)) {
2304                 if (report_baddir || errno != ENOENT) {
2305                         exitcode = (int)MANDOCLEVEL_BADARG;
2306                         say("", "&chdir");
2307                 }
2308                 return 0;
2309         }
2310         chdir_status = 1;
2311         cp = strchr(basedir, '\0');
2312         if ('/' != cp[-1]) {
2313                 if (cp - basedir >= PATH_MAX - 1) {
2314                         exitcode = (int)MANDOCLEVEL_SYSERR;
2315                         say("", "Filename too long");
2316                         return 0;
2317                 }
2318                 *cp++ = '/';
2319                 *cp = '\0';
2320         }
2321         return 1;
2322 }
2323
2324 static void
2325 say(const char *file, const char *format, ...)
2326 {
2327         va_list          ap;
2328         int              use_errno;
2329
2330         if ('\0' != *basedir)
2331                 fprintf(stderr, "%s", basedir);
2332         if ('\0' != *basedir && '\0' != *file)
2333                 fputc('/', stderr);
2334         if ('\0' != *file)
2335                 fprintf(stderr, "%s", file);
2336
2337         use_errno = 1;
2338         if (NULL != format) {
2339                 switch (*format) {
2340                 case '&':
2341                         format++;
2342                         break;
2343                 case '\0':
2344                         format = NULL;
2345                         break;
2346                 default:
2347                         use_errno = 0;
2348                         break;
2349                 }
2350         }
2351         if (NULL != format) {
2352                 if ('\0' != *basedir || '\0' != *file)
2353                         fputs(": ", stderr);
2354                 va_start(ap, format);
2355                 vfprintf(stderr, format, ap);
2356                 va_end(ap);
2357         }
2358         if (use_errno) {
2359                 if ('\0' != *basedir || '\0' != *file || NULL != format)
2360                         fputs(": ", stderr);
2361                 perror(NULL);
2362         } else
2363                 fputc('\n', stderr);
2364 }