contrib/mandoc/main.c

   1 /* $Id: main.c,v 1.358 2021/09/04 22:38:46 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2010-2012, 2014-2021 Ingo Schwarze <schwarze@openbsd.org>
   4  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
   5  * Copyright (c) 2010 Joerg Sonnenberger <joerg@netbsd.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  * Main program for mandoc(1), man(1), apropos(1), whatis(1), and help(1).
  20  */
  21 #include "config.h"
  22
  23 #include <sys/types.h>
  24 #include <sys/ioctl.h>
  25 #include <sys/param.h>  /* MACHINE */
  26 #include <sys/stat.h>
  27 #include <sys/wait.h>
  28
  29 #include <assert.h>
  30 #include <ctype.h>
  31 #if HAVE_ERR
  32 #include <err.h>
  33 #endif
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <glob.h>
  37 #include <limits.h>
  38 #if HAVE_SANDBOX_INIT
  39 #include <sandbox.h>
  40 #endif
  41 #include <signal.h>
  42 #include <stdio.h>
  43 #include <stdint.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <termios.h>
  47 #include <time.h>
  48 #include <unistd.h>
  49
  50 #include "mandoc_aux.h"
  51 #include "mandoc.h"
  52 #include "mandoc_xr.h"
  53 #include "roff.h"
  54 #include "mdoc.h"
  55 #include "man.h"
  56 #include "mandoc_parse.h"
  57 #include "tag.h"
  58 #include "term_tag.h"
  59 #include "main.h"
  60 #include "manconf.h"
  61 #include "mansearch.h"
  62
  63 enum    outmode {
  64         OUTMODE_DEF = 0,
  65         OUTMODE_FLN,
  66         OUTMODE_LST,
  67         OUTMODE_ALL,
  68         OUTMODE_ONE
  69 };
  70
  71 enum    outt {
  72         OUTT_ASCII = 0, /* -Tascii */
  73         OUTT_LOCALE,    /* -Tlocale */
  74         OUTT_UTF8,      /* -Tutf8 */
  75         OUTT_TREE,      /* -Ttree */
  76         OUTT_MAN,       /* -Tman */
  77         OUTT_HTML,      /* -Thtml */
  78         OUTT_MARKDOWN,  /* -Tmarkdown */
  79         OUTT_LINT,      /* -Tlint */
  80         OUTT_PS,        /* -Tps */
  81         OUTT_PDF        /* -Tpdf */
  82 };
  83
  84 struct  outstate {
  85         struct tag_files *tag_files;    /* Tagging state variables. */
  86         void             *outdata;      /* data for output */
  87         int               use_pager;
  88         int               wstop;        /* stop after a file with a warning */
  89         int               had_output;   /* Some output was generated. */
  90         enum outt         outtype;      /* which output to use */
  91 };
  92
  93
  94 int                       mandocdb(int, char *[]);
  95
  96 static  void              check_xr(struct manpaths *);
  97 static  void              fs_append(char **, size_t, int,
  98                                 size_t, const char *, enum form,
  99                                 struct manpage **, size_t *);
 100 static  int               fs_lookup(const struct manpaths *, size_t,
 101                                 const char *, const char *, const char *,
 102                                 struct manpage **, size_t *);
 103 static  int               fs_search(const struct mansearch *,
 104                                 const struct manpaths *, const char *,
 105                                 struct manpage **, size_t *);
 106 static  void              glob_esc(char **, const char *, const char *);
 107 static  void              outdata_alloc(struct outstate *, struct manoutput *);
 108 static  void              parse(struct mparse *, int, const char *,
 109                                 struct outstate *, struct manconf *);
 110 static  void              passthrough(int, int);
 111 static  void              process_onefile(struct mparse *, struct manpage *,
 112                                 int, struct outstate *, struct manconf *);
 113 static  void              run_pager(struct outstate *, char *);
 114 static  pid_t             spawn_pager(struct outstate *, char *);
 115 static  void              usage(enum argmode) __attribute__((__noreturn__));
 116 static  int               woptions(char *, enum mandoc_os *, int *);
 117
 118 static  const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9};
 119 static  char              help_arg[] = "help";
 120 static  char             *help_argv[] = {help_arg, NULL};
 121
 122
 123 int
 124 main(int argc, char *argv[])
 125 {
 126         struct manconf   conf;          /* Manpaths and output options. */
 127         struct outstate  outst;         /* Output state. */
 128         struct winsize   ws;            /* Result of ioctl(TIOCGWINSZ). */
 129         struct mansearch search;        /* Search options. */
 130         struct manpage  *res;           /* Complete list of search results. */
 131         struct manpage  *resn;          /* Search results for one name. */
 132         struct mparse   *mp;            /* Opaque parser object. */
 133         const char      *conf_file;     /* -C: alternate config file. */
 134         const char      *os_s;          /* -I: Operating system for display. */
 135         const char      *progname, *sec, *ep;
 136         char            *defpaths;      /* -M: override manpaths. */
 137         char            *auxpaths;      /* -m: additional manpaths. */
 138         char            *oarg;          /* -O: output option string. */
 139         char            *tagarg;        /* -O tag: default value. */
 140         unsigned char   *uc;
 141         size_t           ressz;         /* Number of elements in res[]. */
 142         size_t           resnsz;        /* Number of elements in resn[]. */
 143         size_t           i, ib, ssz;
 144         int              options;       /* Parser options. */
 145         int              show_usage;    /* Invalid argument: give up. */
 146         int              prio, best_prio;
 147         int              startdir;
 148         int              c;
 149         enum mandoc_os   os_e;          /* Check base system conventions. */
 150         enum outmode     outmode;       /* According to command line. */
 151
 152 #if HAVE_PROGNAME
 153         progname = getprogname();
 154 #else
 155         if (argc < 1)
 156                 progname = mandoc_strdup("mandoc");
 157         else if ((progname = strrchr(argv[0], '/')) == NULL)
 158                 progname = argv[0];
 159         else
 160                 ++progname;
 161         setprogname(progname);
 162 #endif
 163
 164         mandoc_msg_setoutfile(stderr);
 165         if (strncmp(progname, "mandocdb", 8) == 0 ||
 166             strcmp(progname, BINM_MAKEWHATIS) == 0)
 167                 return mandocdb(argc, argv);
 168
 169 #if HAVE_PLEDGE
 170         if (pledge("stdio rpath wpath cpath tmppath tty proc exec", NULL) == -1) {
 171                 mandoc_msg(MANDOCERR_PLEDGE, 0, 0, "%s", strerror(errno));
 172                 return mandoc_msg_getrc();
 173         }
 174 #endif
 175 #if HAVE_SANDBOX_INIT
 176         if (sandbox_init(kSBXProfileNoInternet, SANDBOX_NAMED, NULL) == -1)
 177                 errx((int)MANDOCLEVEL_SYSERR, "sandbox_init");
 178 #endif
 179
 180         /* Search options. */
 181
 182         memset(&conf, 0, sizeof(conf));
 183         conf_file = NULL;
 184         defpaths = auxpaths = NULL;
 185
 186         memset(&search, 0, sizeof(struct mansearch));
 187         search.outkey = "Nd";
 188         oarg = NULL;
 189
 190         if (strcmp(progname, BINM_MAN) == 0)
 191                 search.argmode = ARG_NAME;
 192         else if (strcmp(progname, BINM_APROPOS) == 0)
 193                 search.argmode = ARG_EXPR;
 194         else if (strcmp(progname, BINM_WHATIS) == 0)
 195                 search.argmode = ARG_WORD;
 196         else if (strncmp(progname, "help", 4) == 0)
 197                 search.argmode = ARG_NAME;
 198         else
 199                 search.argmode = ARG_FILE;
 200
 201         /* Parser options. */
 202
 203         options = MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1;
 204         os_e = MANDOC_OS_OTHER;
 205         os_s = NULL;
 206
 207         /* Formatter options. */
 208
 209         memset(&outst, 0, sizeof(outst));
 210         outst.tag_files = NULL;
 211         outst.outtype = OUTT_LOCALE;
 212         outst.use_pager = 1;
 213
 214         show_usage = 0;
 215         outmode = OUTMODE_DEF;
 216
 217         while ((c = getopt(argc, argv,
 218             "aC:cfhI:iK:klM:m:O:S:s:T:VW:w")) != -1) {
 219                 if (c == 'i' && search.argmode == ARG_EXPR) {
 220                         optind--;
 221                         break;
 222                 }
 223                 switch (c) {
 224                 case 'a':
 225                         outmode = OUTMODE_ALL;
 226                         break;
 227                 case 'C':
 228                         conf_file = optarg;
 229                         break;
 230                 case 'c':
 231                         outst.use_pager = 0;
 232                         break;
 233                 case 'f':
 234                         search.argmode = ARG_WORD;
 235                         break;
 236                 case 'h':
 237                         conf.output.synopsisonly = 1;
 238                         outst.use_pager = 0;
 239                         outmode = OUTMODE_ALL;
 240                         break;
 241                 case 'I':
 242                         if (strncmp(optarg, "os=", 3) != 0) {
 243                                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0,
 244                                     "-I %s", optarg);
 245                                 return mandoc_msg_getrc();
 246                         }
 247                         if (os_s != NULL) {
 248                                 mandoc_msg(MANDOCERR_BADARG_DUPE, 0, 0,
 249                                     "-I %s", optarg);
 250                                 return mandoc_msg_getrc();
 251                         }
 252                         os_s = optarg + 3;
 253                         break;
 254                 case 'K':
 255                         options &= ~(MPARSE_UTF8 | MPARSE_LATIN1);
 256                         if (strcmp(optarg, "utf-8") == 0)
 257                                 options |=  MPARSE_UTF8;
 258                         else if (strcmp(optarg, "iso-8859-1") == 0)
 259                                 options |=  MPARSE_LATIN1;
 260                         else if (strcmp(optarg, "us-ascii") != 0) {
 261                                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0,
 262                                     "-K %s", optarg);
 263                                 return mandoc_msg_getrc();
 264                         }
 265                         break;
 266                 case 'k':
 267                         search.argmode = ARG_EXPR;
 268                         break;
 269                 case 'l':
 270                         search.argmode = ARG_FILE;
 271                         outmode = OUTMODE_ALL;
 272                         break;
 273                 case 'M':
 274 #ifdef __FreeBSD__
 275                         defpaths = strdup(optarg);
 276                         if (defpaths == NULL)
 277                                 err(1, "strdup");
 278 #else
 279                         defpaths = optarg;
 280 #endif
 281                         break;
 282                 case 'm':
 283                         auxpaths = optarg;
 284                         break;
 285                 case 'O':
 286                         oarg = optarg;
 287                         break;
 288                 case 'S':
 289                         search.arch = optarg;
 290                         break;
 291                 case 's':
 292                         search.sec = optarg;
 293                         break;
 294                 case 'T':
 295                         if (strcmp(optarg, "ascii") == 0)
 296                                 outst.outtype = OUTT_ASCII;
 297                         else if (strcmp(optarg, "lint") == 0) {
 298                                 outst.outtype = OUTT_LINT;
 299                                 mandoc_msg_setoutfile(stdout);
 300                                 mandoc_msg_setmin(MANDOCERR_BASE);
 301                         } else if (strcmp(optarg, "tree") == 0)
 302                                 outst.outtype = OUTT_TREE;
 303                         else if (strcmp(optarg, "man") == 0)
 304                                 outst.outtype = OUTT_MAN;
 305                         else if (strcmp(optarg, "html") == 0)
 306                                 outst.outtype = OUTT_HTML;
 307                         else if (strcmp(optarg, "markdown") == 0)
 308                                 outst.outtype = OUTT_MARKDOWN;
 309                         else if (strcmp(optarg, "utf8") == 0)
 310                                 outst.outtype = OUTT_UTF8;
 311                         else if (strcmp(optarg, "locale") == 0)
 312                                 outst.outtype = OUTT_LOCALE;
 313                         else if (strcmp(optarg, "ps") == 0)
 314                                 outst.outtype = OUTT_PS;
 315                         else if (strcmp(optarg, "pdf") == 0)
 316                                 outst.outtype = OUTT_PDF;
 317                         else {
 318                                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0,
 319                                     "-T %s", optarg);
 320                                 return mandoc_msg_getrc();
 321                         }
 322                         break;
 323                 case 'W':
 324                         if (woptions(optarg, &os_e, &outst.wstop) == -1)
 325                                 return mandoc_msg_getrc();
 326                         break;
 327                 case 'w':
 328                         outmode = OUTMODE_FLN;
 329                         break;
 330                 default:
 331                         show_usage = 1;
 332                         break;
 333                 }
 334         }
 335
 336         if (show_usage)
 337                 usage(search.argmode);
 338
 339         /* Postprocess options. */
 340
 341         switch (outmode) {
 342         case OUTMODE_DEF:
 343                 switch (search.argmode) {
 344                 case ARG_FILE:
 345                         outmode = OUTMODE_ALL;
 346                         outst.use_pager = 0;
 347                         break;
 348                 case ARG_NAME:
 349                         outmode = OUTMODE_ONE;
 350                         break;
 351                 default:
 352                         outmode = OUTMODE_LST;
 353                         break;
 354                 }
 355                 break;
 356         case OUTMODE_FLN:
 357                 if (search.argmode == ARG_FILE)
 358                         outmode = OUTMODE_ALL;
 359                 break;
 360         case OUTMODE_ALL:
 361                 break;
 362         case OUTMODE_LST:
 363         case OUTMODE_ONE:
 364                 abort();
 365         }
 366
 367         if (oarg != NULL) {
 368                 if (outmode == OUTMODE_LST)
 369                         search.outkey = oarg;
 370                 else {
 371                         while (oarg != NULL) {
 372                                 if (manconf_output(&conf.output,
 373                                     strsep(&oarg, ","), 0) == -1)
 374                                         return mandoc_msg_getrc();
 375                         }
 376                 }
 377         }
 378
 379         if (outst.outtype != OUTT_TREE || conf.output.noval == 0)
 380                 options |= MPARSE_VALIDATE;
 381
 382         if (outmode == OUTMODE_FLN ||
 383             outmode == OUTMODE_LST ||
 384             (conf.output.outfilename == NULL &&
 385              conf.output.tagfilename == NULL &&
 386              isatty(STDOUT_FILENO) == 0))
 387                 outst.use_pager = 0;
 388
 389         if (outst.use_pager &&
 390             (conf.output.width == 0 || conf.output.indent == 0) &&
 391             ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1 &&
 392             ws.ws_col > 1) {
 393                 if (conf.output.width == 0 && ws.ws_col < 79)
 394                         conf.output.width = ws.ws_col - 1;
 395                 if (conf.output.indent == 0 && ws.ws_col < 66)
 396                         conf.output.indent = 3;
 397         }
 398
 399 #if HAVE_PLEDGE
 400         if (outst.use_pager == 0)
 401                 c = pledge("stdio rpath", NULL);
 402         else if (conf.output.outfilename != NULL ||
 403             conf.output.tagfilename != NULL)
 404                 c = pledge("stdio rpath wpath cpath", NULL);
 405         else
 406                 c = pledge("stdio rpath tmppath tty proc exec", NULL);
 407         if (c == -1) {
 408                 mandoc_msg(MANDOCERR_PLEDGE, 0, 0, "%s", strerror(errno));
 409                 return mandoc_msg_getrc();
 410         }
 411 #endif
 412
 413         /* Parse arguments. */
 414
 415         if (argc > 0) {
 416                 argc -= optind;
 417                 argv += optind;
 418         }
 419
 420         /*
 421          * Quirks for help(1) and man(1),
 422          * in particular for a section argument without -s.
 423          */
 424
 425         if (search.argmode == ARG_NAME) {
 426                 if (*progname == 'h') {
 427                         if (argc == 0) {
 428                                 argv = help_argv;
 429                                 argc = 1;
 430                         }
 431                 } else if (argc > 1 &&
 432                     ((uc = (unsigned char *)argv[0]) != NULL) &&
 433                     ((isdigit(uc[0]) && (uc[1] == '\0' ||
 434                       isalpha(uc[1]))) ||
 435                      (uc[0] == 'n' && uc[1] == '\0'))) {
 436                         search.sec = (char *)uc;
 437                         argv++;
 438                         argc--;
 439                 }
 440                 if (search.arch == NULL)
 441                         search.arch = getenv("MACHINE");
 442 #ifdef MACHINE
 443                 if (search.arch == NULL)
 444                         search.arch = MACHINE;
 445 #endif
 446                 if (outmode == OUTMODE_ONE)
 447                         search.firstmatch = 1;
 448         }
 449
 450         /*
 451          * Use the first argument for -O tag in addition to
 452          * using it as a search term for man(1) or apropos(1).
 453          */
 454
 455         if (conf.output.tag != NULL && *conf.output.tag == '\0') {
 456                 tagarg = argc > 0 && search.argmode == ARG_EXPR ?
 457                     strchr(*argv, '=') : NULL;
 458                 conf.output.tag = tagarg == NULL ? *argv : tagarg + 1;
 459         }
 460
 461         if (search.argmode != ARG_FILE ||
 462             mandoc_msg_getmin() == MANDOCERR_STYLE)
 463 #ifdef __FreeBSD__
 464         {
 465                 /*
 466                  * Use manpath(1) to populate defpaths if -M is not specified.
 467                  * Don't treat any failures as fatal.
 468                  */
 469                 if (defpaths == NULL) {
 470                         FILE *fp;
 471                         size_t linecap = 0;
 472                         ssize_t linelen;
 473
 474                         if ((fp = popen("/usr/bin/manpath -q", "r")) != NULL) {
 475                                 if ((linelen = getline(&defpaths,
 476                                     &linecap, fp)) > 0) {
 477                                         /* Strip trailing newline */
 478                                         defpaths[linelen - 1] = '\0';
 479                                 }
 480                                 pclose(fp);
 481                         }
 482                 }
 483 #endif
 484         /* Read the configuration file. */
 485                 manconf_parse(&conf, conf_file, defpaths, auxpaths);
 486 #ifdef __FreeBSD__
 487                 free(defpaths);
 488         }
 489 #endif
 490
 491         /* man(1): Resolve each name individually. */
 492
 493         if (search.argmode == ARG_NAME) {
 494                 if (argc < 1) {
 495                         if (outmode != OUTMODE_FLN)
 496                                 usage(ARG_NAME);
 497                         if (conf.manpath.sz == 0) {
 498                                 warnx("The manpath is empty.");
 499                                 mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 500                         } else {
 501                                 for (i = 0; i + 1 < conf.manpath.sz; i++)
 502                                         printf("%s:", conf.manpath.paths[i]);
 503                                 printf("%s\n", conf.manpath.paths[i]);
 504                         }
 505                         manconf_free(&conf);
 506                         return (int)mandoc_msg_getrc();
 507                 }
 508                 for (res = NULL, ressz = 0; argc > 0; argc--, argv++) {
 509                         (void)mansearch(&search, &conf.manpath,
 510                             1, argv, &resn, &resnsz);
 511                         if (resnsz == 0)
 512                                 (void)fs_search(&search, &conf.manpath,
 513                                     *argv, &resn, &resnsz);
 514                         if (resnsz == 0 && strchr(*argv, '/') == NULL) {
 515                                 if (search.arch != NULL &&
 516                                     arch_valid(search.arch, OSENUM) == 0)
 517                                         warnx("Unknown architecture \"%s\".",
 518                                             search.arch);
 519                                 else if (search.sec != NULL)
 520                                         warnx("No entry for %s in "
 521                                             "section %s of the manual.",
 522                                             *argv, search.sec);
 523                                 else
 524                                         warnx("No entry for %s in "
 525                                             "the manual.", *argv);
 526                                 mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 527                                 continue;
 528                         }
 529                         if (resnsz == 0) {
 530                                 if (access(*argv, R_OK) == -1) {
 531                                         mandoc_msg_setinfilename(*argv);
 532                                         mandoc_msg(MANDOCERR_BADARG_BAD,
 533                                             0, 0, "%s", strerror(errno));
 534                                         mandoc_msg_setinfilename(NULL);
 535                                         continue;
 536                                 }
 537                                 resnsz = 1;
 538                                 resn = mandoc_calloc(resnsz, sizeof(*res));
 539                                 resn->file = mandoc_strdup(*argv);
 540                                 resn->ipath = SIZE_MAX;
 541                                 resn->form = FORM_SRC;
 542                         }
 543                         if (outmode != OUTMODE_ONE || resnsz == 1) {
 544                                 res = mandoc_reallocarray(res,
 545                                     ressz + resnsz, sizeof(*res));
 546                                 memcpy(res + ressz, resn,
 547                                     sizeof(*resn) * resnsz);
 548                                 ressz += resnsz;
 549                                 continue;
 550                         }
 551
 552                         /* Search for the best section. */
 553
 554                         best_prio = 40;
 555                         for (ib = i = 0; i < resnsz; i++) {
 556                                 sec = resn[i].file;
 557                                 sec += strcspn(sec, "123456789");
 558                                 if (sec[0] == '\0')
 559                                         continue; /* No section at all. */
 560                                 prio = sec_prios[sec[0] - '1'];
 561                                 if (search.sec != NULL) {
 562                                         ssz = strlen(search.sec);
 563                                         if (strncmp(sec, search.sec, ssz) == 0)
 564                                                 sec += ssz;
 565                                 } else
 566                                         sec++; /* Prefer without suffix. */
 567                                 if (*sec != '/')
 568                                         prio += 10; /* Wrong dir name. */
 569                                 if (search.sec != NULL) {
 570                                         ep = strchr(sec, '\0');
 571                                         if (ep - sec > 3 &&
 572                                             strncmp(ep - 3, ".gz", 3) == 0)
 573                                                 ep -= 3;
 574                                         if ((size_t)(ep - sec) < ssz + 3 ||
 575                                             strncmp(ep - ssz, search.sec,
 576                                              ssz) != 0)      /* Wrong file */
 577                                                 prio += 20;  /* extension. */
 578                                 }
 579                                 if (prio >= best_prio)
 580                                         continue;
 581                                 best_prio = prio;
 582                                 ib = i;
 583                         }
 584                         res = mandoc_reallocarray(res, ressz + 1,
 585                             sizeof(*res));
 586                         memcpy(res + ressz++, resn + ib, sizeof(*resn));
 587                 }
 588
 589         /* apropos(1), whatis(1): Process the full search expression. */
 590
 591         } else if (search.argmode != ARG_FILE) {
 592                 if (mansearch(&search, &conf.manpath,
 593                     argc, argv, &res, &ressz) == 0)
 594                         usage(search.argmode);
 595
 596                 if (ressz == 0) {
 597                         warnx("nothing appropriate");
 598                         mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 599                         goto out;
 600                 }
 601
 602         /* mandoc(1): Take command line arguments as file names. */
 603
 604         } else {
 605                 ressz = argc > 0 ? argc : 1;
 606                 res = mandoc_calloc(ressz, sizeof(*res));
 607                 for (i = 0; i < ressz; i++) {
 608                         if (argc > 0)
 609                                 res[i].file = mandoc_strdup(argv[i]);
 610                         res[i].ipath = SIZE_MAX;
 611                         res[i].form = FORM_SRC;
 612                 }
 613         }
 614
 615         switch (outmode) {
 616         case OUTMODE_FLN:
 617                 for (i = 0; i < ressz; i++)
 618                         puts(res[i].file);
 619                 goto out;
 620         case OUTMODE_LST:
 621                 for (i = 0; i < ressz; i++)
 622                         printf("%s - %s\n", res[i].names,
 623                             res[i].output == NULL ? "" :
 624                             res[i].output);
 625                 goto out;
 626         default:
 627                 break;
 628         }
 629
 630         if (search.argmode == ARG_FILE && auxpaths != NULL) {
 631                 if (strcmp(auxpaths, "doc") == 0)
 632                         options |= MPARSE_MDOC;
 633                 else if (strcmp(auxpaths, "an") == 0)
 634                         options |= MPARSE_MAN;
 635         }
 636
 637         mchars_alloc();
 638         mp = mparse_alloc(options, os_e, os_s);
 639
 640         /*
 641          * Remember the original working directory, if possible.
 642          * This will be needed if some names on the command line
 643          * are page names and some are relative file names.
 644          * Do not error out if the current directory is not
 645          * readable: Maybe it won't be needed after all.
 646          */
 647         startdir = open(".", O_RDONLY | O_DIRECTORY);
 648         for (i = 0; i < ressz; i++) {
 649                 process_onefile(mp, res + i, startdir, &outst, &conf);
 650                 if (outst.wstop && mandoc_msg_getrc() != MANDOCLEVEL_OK)
 651                         break;
 652         }
 653         if (startdir != -1) {
 654                 (void)fchdir(startdir);
 655                 close(startdir);
 656         }
 657         if (conf.output.tag != NULL && conf.output.tag_found == 0) {
 658                 mandoc_msg(MANDOCERR_TAG, 0, 0, "%s", conf.output.tag);
 659                 conf.output.tag = NULL;
 660         }
 661         if (outst.outdata != NULL) {
 662                 switch (outst.outtype) {
 663                 case OUTT_HTML:
 664                         html_free(outst.outdata);
 665                         break;
 666                 case OUTT_UTF8:
 667                 case OUTT_LOCALE:
 668                 case OUTT_ASCII:
 669                         ascii_free(outst.outdata);
 670                         break;
 671                 case OUTT_PDF:
 672                 case OUTT_PS:
 673                         pspdf_free(outst.outdata);
 674                         break;
 675                 default:
 676                         break;
 677                 }
 678         }
 679         mandoc_xr_free();
 680         mparse_free(mp);
 681         mchars_free();
 682
 683 out:
 684         mansearch_free(res, ressz);
 685         if (search.argmode != ARG_FILE)
 686                 manconf_free(&conf);
 687
 688         if (outst.tag_files != NULL) {
 689                 if (term_tag_close() != -1 &&
 690                     conf.output.outfilename == NULL &&
 691                     conf.output.tagfilename == NULL)
 692                         run_pager(&outst, conf.output.tag);
 693                 term_tag_unlink();
 694         } else if (outst.had_output && outst.outtype != OUTT_LINT)
 695                 mandoc_msg_summary();
 696
 697         return (int)mandoc_msg_getrc();
 698 }
 699
 700 static void
 701 usage(enum argmode argmode)
 702 {
 703         switch (argmode) {
 704         case ARG_FILE:
 705                 fputs("usage: mandoc [-ac] [-I os=name] "
 706                     "[-K encoding] [-mdoc | -man] [-O options]\n"
 707                     "\t      [-T output] [-W level] [file ...]\n", stderr);
 708                 break;
 709         case ARG_NAME:
 710                 fputs("usage: man [-acfhklw] [-C file] [-M path] "
 711                     "[-m path] [-S subsection]\n"
 712                     "\t   [[-s] section] name ...\n", stderr);
 713                 break;
 714         case ARG_WORD:
 715                 fputs("usage: whatis [-afk] [-C file] "
 716                     "[-M path] [-m path] [-O outkey] [-S arch]\n"
 717                     "\t      [-s section] name ...\n", stderr);
 718                 break;
 719         case ARG_EXPR:
 720                 fputs("usage: apropos [-afk] [-C file] "
 721                     "[-M path] [-m path] [-O outkey] [-S arch]\n"
 722                     "\t       [-s section] expression ...\n", stderr);
 723                 break;
 724         }
 725         exit((int)MANDOCLEVEL_BADARG);
 726 }
 727
 728 static void
 729 glob_esc(char **dst, const char *src, const char *suffix)
 730 {
 731         while (*src != '\0') {
 732                 if (strchr("*?[", *src) != NULL)
 733                         *(*dst)++ = '\\';
 734                 *(*dst)++ = *src++;
 735         }
 736         while (*suffix != '\0')
 737                 *(*dst)++ = *suffix++;
 738 }
 739
 740 static void
 741 fs_append(char **file, size_t filesz, int copy, size_t ipath,
 742     const char *sec, enum form form, struct manpage **res, size_t *ressz)
 743 {
 744         struct manpage  *page;
 745
 746         *res = mandoc_reallocarray(*res, *ressz + filesz, sizeof(**res));
 747         page = *res + *ressz;
 748         *ressz += filesz;
 749         for (;;) {
 750                 page->file = copy ? mandoc_strdup(*file) : *file;
 751                 page->names = NULL;
 752                 page->output = NULL;
 753                 page->bits = NAME_FILE & NAME_MASK;
 754                 page->ipath = ipath;
 755                 page->sec = (*sec >= '1' && *sec <= '9') ? *sec - '1' + 1 : 10;
 756                 page->form = form;
 757                 if (--filesz == 0)
 758                         break;
 759                 file++;
 760                 page++;
 761         }
 762 }
 763
 764 static int
 765 fs_lookup(const struct manpaths *paths, size_t ipath,
 766         const char *sec, const char *arch, const char *name,
 767         struct manpage **res, size_t *ressz)
 768 {
 769         struct stat      sb;
 770         glob_t           globinfo;
 771         char            *file, *cp, secnum[2];
 772         int              globres;
 773         enum form        form;
 774
 775         const char *const slman = "/man";
 776         const char *const slash = "/";
 777         const char *const sglob = ".[01-9]*";
 778         const char *const dot   = ".";
 779         const char *const aster = "*";
 780
 781         memset(&globinfo, 0, sizeof(globinfo));
 782         form = FORM_SRC;
 783
 784         mandoc_asprintf(&file, "%s/man%s/%s.%s",
 785             paths->paths[ipath], sec, name, sec);
 786         if (stat(file, &sb) != -1)
 787                 goto found;
 788         free(file);
 789
 790         mandoc_asprintf(&file, "%s/cat%s/%s.0",
 791             paths->paths[ipath], sec, name);
 792         if (stat(file, &sb) != -1) {
 793                 form = FORM_CAT;
 794                 goto found;
 795         }
 796         free(file);
 797
 798         if (arch != NULL) {
 799                 mandoc_asprintf(&file, "%s/man%s/%s/%s.%s",
 800                     paths->paths[ipath], sec, arch, name, sec);
 801                 if (stat(file, &sb) != -1)
 802                         goto found;
 803                 free(file);
 804         }
 805
 806         cp = file = mandoc_malloc(strlen(paths->paths[ipath]) * 2 +
 807             strlen(slman) + strlen(sec) * 2 + strlen(slash) +
 808             strlen(name) * 2 + strlen(sglob) + 1);
 809         glob_esc(&cp, paths->paths[ipath], slman);
 810         glob_esc(&cp, sec, slash);
 811         glob_esc(&cp, name, sglob);
 812         *cp = '\0';
 813         globres = glob(file, 0, NULL, &globinfo);
 814         if (globres != 0 && globres != GLOB_NOMATCH)
 815                 mandoc_msg(MANDOCERR_GLOB, 0, 0,
 816                     "%s: %s", file, strerror(errno));
 817         free(file);
 818         file = NULL;
 819         if (globres == 0)
 820                 goto found;
 821         globfree(&globinfo);
 822
 823         if (sec[1] != '\0' && *ressz == 0) {
 824                 secnum[0] = sec[0];
 825                 secnum[1] = '\0';
 826                 cp = file = mandoc_malloc(strlen(paths->paths[ipath]) * 2 +
 827                     strlen(slman) + strlen(secnum) * 2 + strlen(slash) +
 828                     strlen(name) * 2 + strlen(dot) +
 829                     strlen(sec) * 2 + strlen(aster) + 1);
 830                 glob_esc(&cp, paths->paths[ipath], slman);
 831                 glob_esc(&cp, secnum, slash);
 832                 glob_esc(&cp, name, dot);
 833                 glob_esc(&cp, sec, aster);
 834                 *cp = '\0';
 835                 globres = glob(file, 0, NULL, &globinfo);
 836                 if (globres != 0 && globres != GLOB_NOMATCH)
 837                         mandoc_msg(MANDOCERR_GLOB, 0, 0,
 838                             "%s: %s", file, strerror(errno));
 839                 free(file);
 840                 file = NULL;
 841                 if (globres == 0)
 842                         goto found;
 843                 globfree(&globinfo);
 844         }
 845
 846         if (res != NULL || ipath + 1 != paths->sz)
 847                 return -1;
 848
 849         mandoc_asprintf(&file, "%s.%s", name, sec);
 850         globres = stat(file, &sb);
 851         free(file);
 852         return globres;
 853
 854 found:
 855         warnx("outdated mandoc.db lacks %s(%s) entry, run %s %s",
 856             name, sec, BINM_MAKEWHATIS, paths->paths[ipath]);
 857         if (res == NULL)
 858                 free(file);
 859         else if (file == NULL)
 860                 fs_append(globinfo.gl_pathv, globinfo.gl_pathc, 1,
 861                     ipath, sec, form, res, ressz);
 862         else
 863                 fs_append(&file, 1, 0, ipath, sec, form, res, ressz);
 864         globfree(&globinfo);
 865         return 0;
 866 }
 867
 868 static int
 869 fs_search(const struct mansearch *cfg, const struct manpaths *paths,
 870         const char *name, struct manpage **res, size_t *ressz)
 871 {
 872         const char *const sections[] =
 873             {"1", "8", "6", "2", "3", "5", "7", "4", "9", "3p"};
 874         const size_t nsec = sizeof(sections)/sizeof(sections[0]);
 875
 876         size_t           ipath, isec;
 877
 878         assert(cfg->argmode == ARG_NAME);
 879         if (res != NULL)
 880                 *res = NULL;
 881         *ressz = 0;
 882         for (ipath = 0; ipath < paths->sz; ipath++) {
 883                 if (cfg->sec != NULL) {
 884                         if (fs_lookup(paths, ipath, cfg->sec, cfg->arch,
 885                             name, res, ressz) != -1 && cfg->firstmatch)
 886                                 return 0;
 887                 } else {
 888                         for (isec = 0; isec < nsec; isec++)
 889                                 if (fs_lookup(paths, ipath, sections[isec],
 890                                     cfg->arch, name, res, ressz) != -1 &&
 891                                     cfg->firstmatch)
 892                                         return 0;
 893                 }
 894         }
 895         return -1;
 896 }
 897
 898 static void
 899 process_onefile(struct mparse *mp, struct manpage *resp, int startdir,
 900     struct outstate *outst, struct manconf *conf)
 901 {
 902         int      fd;
 903
 904         /*
 905          * Changing directories is not needed in ARG_FILE mode.
 906          * Do it on a best-effort basis.  Even in case of
 907          * failure, some functionality may still work.
 908          */
 909         if (resp->ipath != SIZE_MAX)
 910                 (void)chdir(conf->manpath.paths[resp->ipath]);
 911         else if (startdir != -1)
 912                 (void)fchdir(startdir);
 913
 914         mandoc_msg_setinfilename(resp->file);
 915         if (resp->file != NULL) {
 916                 if ((fd = mparse_open(mp, resp->file)) == -1) {
 917                         mandoc_msg(resp->ipath == SIZE_MAX ?
 918                             MANDOCERR_BADARG_BAD : MANDOCERR_OPEN,
 919                             0, 0, "%s", strerror(errno));
 920                         mandoc_msg_setinfilename(NULL);
 921                         return;
 922                 }
 923         } else
 924                 fd = STDIN_FILENO;
 925
 926         if (outst->use_pager) {
 927                 outst->use_pager = 0;
 928                 outst->tag_files = term_tag_init(conf->output.outfilename,
 929                     outst->outtype == OUTT_HTML ? ".html" : "",
 930                     conf->output.tagfilename);
 931 #if HAVE_PLEDGE
 932                 if ((conf->output.outfilename != NULL ||
 933                      conf->output.tagfilename != NULL) &&
 934                     pledge("stdio rpath cpath", NULL) == -1) {
 935                         mandoc_msg(MANDOCERR_PLEDGE, 0, 0,
 936                             "%s", strerror(errno));
 937                         exit(mandoc_msg_getrc());
 938                 }
 939 #endif
 940         }
 941         if (outst->had_output && outst->outtype <= OUTT_UTF8) {
 942                 if (outst->outdata == NULL)
 943                         outdata_alloc(outst, &conf->output);
 944                 terminal_sepline(outst->outdata);
 945         }
 946
 947         if (resp->form == FORM_SRC)
 948                 parse(mp, fd, resp->file, outst, conf);
 949         else {
 950                 passthrough(fd, conf->output.synopsisonly);
 951                 outst->had_output = 1;
 952         }
 953
 954         if (ferror(stdout)) {
 955                 if (outst->tag_files != NULL) {
 956                         mandoc_msg(MANDOCERR_WRITE, 0, 0, "%s: %s",
 957                             outst->tag_files->ofn, strerror(errno));
 958                         term_tag_unlink();
 959                         outst->tag_files = NULL;
 960                 } else
 961                         mandoc_msg(MANDOCERR_WRITE, 0, 0, "%s",
 962                             strerror(errno));
 963         }
 964         mandoc_msg_setinfilename(NULL);
 965 }
 966
 967 static void
 968 parse(struct mparse *mp, int fd, const char *file,
 969     struct outstate *outst, struct manconf *conf)
 970 {
 971         static struct manpaths   basepaths;
 972         static int               previous;
 973         struct roff_meta        *meta;
 974
 975         assert(fd >= 0);
 976         if (file == NULL)
 977                 file = "<stdin>";
 978
 979         if (previous)
 980                 mparse_reset(mp);
 981         else
 982                 previous = 1;
 983
 984         mparse_readfd(mp, fd, file);
 985         if (fd != STDIN_FILENO)
 986                 close(fd);
 987
 988         /*
 989          * With -Wstop and warnings or errors of at least the requested
 990          * level, do not produce output.
 991          */
 992
 993         if (outst->wstop && mandoc_msg_getrc() != MANDOCLEVEL_OK)
 994                 return;
 995
 996         if (outst->outdata == NULL)
 997                 outdata_alloc(outst, &conf->output);
 998         else if (outst->outtype == OUTT_HTML)
 999                 html_reset(outst->outdata);
1000
1001         mandoc_xr_reset();
1002         meta = mparse_result(mp);
1003
1004         /* Execute the out device, if it exists. */
1005
1006         outst->had_output = 1;
1007         if (meta->macroset == MACROSET_MDOC) {
1008                 switch (outst->outtype) {
1009                 case OUTT_HTML:
1010                         html_mdoc(outst->outdata, meta);
1011                         break;
1012                 case OUTT_TREE:
1013                         tree_mdoc(outst->outdata, meta);
1014                         break;
1015                 case OUTT_MAN:
1016                         man_mdoc(outst->outdata, meta);
1017                         break;
1018                 case OUTT_PDF:
1019                 case OUTT_ASCII:
1020                 case OUTT_UTF8:
1021                 case OUTT_LOCALE:
1022                 case OUTT_PS:
1023                         terminal_mdoc(outst->outdata, meta);
1024                         break;
1025                 case OUTT_MARKDOWN:
1026                         markdown_mdoc(outst->outdata, meta);
1027                         break;
1028                 default:
1029                         break;
1030                 }
1031         }
1032         if (meta->macroset == MACROSET_MAN) {
1033                 switch (outst->outtype) {
1034                 case OUTT_HTML:
1035                         html_man(outst->outdata, meta);
1036                         break;
1037                 case OUTT_TREE:
1038                         tree_man(outst->outdata, meta);
1039                         break;
1040                 case OUTT_MAN:
1041                         mparse_copy(mp);
1042                         break;
1043                 case OUTT_PDF:
1044                 case OUTT_ASCII:
1045                 case OUTT_UTF8:
1046                 case OUTT_LOCALE:
1047                 case OUTT_PS:
1048                         terminal_man(outst->outdata, meta);
1049                         break;
1050                 case OUTT_MARKDOWN:
1051                         mandoc_msg(MANDOCERR_MAN_TMARKDOWN, 0, 0, NULL);
1052                         break;
1053                 default:
1054                         break;
1055                 }
1056         }
1057         if (conf->output.tag != NULL && conf->output.tag_found == 0 &&
1058             tag_exists(conf->output.tag))
1059                 conf->output.tag_found = 1;
1060
1061         if (mandoc_msg_getmin() < MANDOCERR_STYLE) {
1062                 if (basepaths.sz == 0)
1063                         manpath_base(&basepaths);
1064                 check_xr(&basepaths);
1065         } else if (mandoc_msg_getmin() < MANDOCERR_WARNING)
1066                 check_xr(&conf->manpath);
1067 }
1068
1069 static void
1070 check_xr(struct manpaths *paths)
1071 {
1072         struct mansearch         search;
1073         struct mandoc_xr        *xr;
1074         size_t                   sz;
1075
1076         for (xr = mandoc_xr_get(); xr != NULL; xr = xr->next) {
1077                 if (xr->line == -1)
1078                         continue;
1079                 search.arch = NULL;
1080                 search.sec = xr->sec;
1081                 search.outkey = NULL;
1082                 search.argmode = ARG_NAME;
1083                 search.firstmatch = 1;
1084                 if (mansearch(&search, paths, 1, &xr->name, NULL, &sz))
1085                         continue;
1086                 if (fs_search(&search, paths, xr->name, NULL, &sz) != -1)
1087                         continue;
1088                 if (xr->count == 1)
1089                         mandoc_msg(MANDOCERR_XR_BAD, xr->line,
1090                             xr->pos + 1, "Xr %s %s", xr->name, xr->sec);
1091                 else
1092                         mandoc_msg(MANDOCERR_XR_BAD, xr->line,
1093                             xr->pos + 1, "Xr %s %s (%d times)",
1094                             xr->name, xr->sec, xr->count);
1095         }
1096 }
1097
1098 static void
1099 outdata_alloc(struct outstate *outst, struct manoutput *outconf)
1100 {
1101         switch (outst->outtype) {
1102         case OUTT_HTML:
1103                 outst->outdata = html_alloc(outconf);
1104                 break;
1105         case OUTT_UTF8:
1106                 outst->outdata = utf8_alloc(outconf);
1107                 break;
1108         case OUTT_LOCALE:
1109                 outst->outdata = locale_alloc(outconf);
1110                 break;
1111         case OUTT_ASCII:
1112                 outst->outdata = ascii_alloc(outconf);
1113                 break;
1114         case OUTT_PDF:
1115                 outst->outdata = pdf_alloc(outconf);
1116                 break;
1117         case OUTT_PS:
1118                 outst->outdata = ps_alloc(outconf);
1119                 break;
1120         default:
1121                 break;
1122         }
1123 }
1124
1125 static void
1126 passthrough(int fd, int synopsis_only)
1127 {
1128         const char       synb[] = "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS";
1129         const char       synr[] = "SYNOPSIS";
1130
1131         FILE            *stream;
1132         char            *line, *cp;
1133         size_t           linesz;
1134         ssize_t          len, written;
1135         int              lno, print;
1136
1137         stream = NULL;
1138         line = NULL;
1139         linesz = 0;
1140
1141         if (fflush(stdout) == EOF) {
1142                 mandoc_msg(MANDOCERR_FFLUSH, 0, 0, "%s", strerror(errno));
1143                 goto done;
1144         }
1145         if ((stream = fdopen(fd, "r")) == NULL) {
1146                 close(fd);
1147                 mandoc_msg(MANDOCERR_FDOPEN, 0, 0, "%s", strerror(errno));
1148                 goto done;
1149         }
1150
1151         lno = print = 0;
1152         while ((len = getline(&line, &linesz, stream)) != -1) {
1153                 lno++;
1154                 cp = line;
1155                 if (synopsis_only) {
1156                         if (print) {
1157                                 if ( ! isspace((unsigned char)*cp))
1158                                         goto done;
1159                                 while (isspace((unsigned char)*cp)) {
1160                                         cp++;
1161                                         len--;
1162                                 }
1163                         } else {
1164                                 if (strcmp(cp, synb) == 0 ||
1165                                     strcmp(cp, synr) == 0)
1166                                         print = 1;
1167                                 continue;
1168                         }
1169                 }
1170                 for (; len > 0; len -= written) {
1171                         if ((written = write(STDOUT_FILENO, cp, len)) == -1) {
1172                                 mandoc_msg(MANDOCERR_WRITE, 0, 0,
1173                                     "%s", strerror(errno));
1174                                 goto done;
1175                         }
1176                 }
1177         }
1178         if (ferror(stream))
1179                 mandoc_msg(MANDOCERR_GETLINE, lno, 0, "%s", strerror(errno));
1180
1181 done:
1182         free(line);
1183         if (stream != NULL)
1184                 fclose(stream);
1185 }
1186
1187 static int
1188 woptions(char *arg, enum mandoc_os *os_e, int *wstop)
1189 {
1190         char            *v, *o;
1191         const char      *toks[11];
1192
1193         toks[0] = "stop";
1194         toks[1] = "all";
1195         toks[2] = "base";
1196         toks[3] = "style";
1197         toks[4] = "warning";
1198         toks[5] = "error";
1199         toks[6] = "unsupp";
1200         toks[7] = "fatal";
1201         toks[8] = "openbsd";
1202         toks[9] = "netbsd";
1203         toks[10] = NULL;
1204
1205         while (*arg) {
1206                 o = arg;
1207                 switch (getsubopt(&arg, (char * const *)toks, &v)) {
1208                 case 0:
1209                         *wstop = 1;
1210                         break;
1211                 case 1:
1212                 case 2:
1213                         mandoc_msg_setmin(MANDOCERR_BASE);
1214                         break;
1215                 case 3:
1216                         mandoc_msg_setmin(MANDOCERR_STYLE);
1217                         break;
1218                 case 4:
1219                         mandoc_msg_setmin(MANDOCERR_WARNING);
1220                         break;
1221                 case 5:
1222                         mandoc_msg_setmin(MANDOCERR_ERROR);
1223                         break;
1224                 case 6:
1225                         mandoc_msg_setmin(MANDOCERR_UNSUPP);
1226                         break;
1227                 case 7:
1228                         mandoc_msg_setmin(MANDOCERR_BADARG);
1229                         break;
1230                 case 8:
1231                         mandoc_msg_setmin(MANDOCERR_BASE);
1232                         *os_e = MANDOC_OS_OPENBSD;
1233                         break;
1234                 case 9:
1235                         mandoc_msg_setmin(MANDOCERR_BASE);
1236                         *os_e = MANDOC_OS_NETBSD;
1237                         break;
1238                 default:
1239                         mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0, "-W %s", o);
1240                         return -1;
1241                 }
1242         }
1243         return 0;
1244 }
1245
1246 /*
1247  * Wait until moved to the foreground,
1248  * then fork the pager and wait for the user to close it.
1249  */
1250 static void
1251 run_pager(struct outstate *outst, char *tag_target)
1252 {
1253         int      signum, status;
1254         pid_t    man_pgid, tc_pgid;
1255         pid_t    pager_pid, wait_pid;
1256
1257         man_pgid = getpgid(0);
1258         outst->tag_files->tcpgid =
1259             man_pgid == getpid() ? getpgid(getppid()) : man_pgid;
1260         pager_pid = 0;
1261         signum = SIGSTOP;
1262
1263         for (;;) {
1264                 /* Stop here until moved to the foreground. */
1265
1266                 tc_pgid = tcgetpgrp(STDOUT_FILENO);
1267                 if (tc_pgid != man_pgid) {
1268                         if (tc_pgid == pager_pid) {
1269                                 (void)tcsetpgrp(STDOUT_FILENO, man_pgid);
1270                                 if (signum == SIGTTIN)
1271                                         continue;
1272                         } else
1273                                 outst->tag_files->tcpgid = tc_pgid;
1274                         kill(0, signum);
1275                         continue;
1276                 }
1277
1278                 /* Once in the foreground, activate the pager. */
1279
1280                 if (pager_pid) {
1281                         (void)tcsetpgrp(STDOUT_FILENO, pager_pid);
1282                         kill(pager_pid, SIGCONT);
1283                 } else
1284                         pager_pid = spawn_pager(outst, tag_target);
1285
1286                 /* Wait for the pager to stop or exit. */
1287
1288                 while ((wait_pid = waitpid(pager_pid, &status,
1289                     WUNTRACED)) == -1 && errno == EINTR)
1290                         continue;
1291
1292                 if (wait_pid == -1) {
1293                         mandoc_msg(MANDOCERR_WAIT, 0, 0,
1294                             "%s", strerror(errno));
1295                         break;
1296                 }
1297                 if (!WIFSTOPPED(status))
1298                         break;
1299
1300                 signum = WSTOPSIG(status);
1301         }
1302 }
1303
1304 static pid_t
1305 spawn_pager(struct outstate *outst, char *tag_target)
1306 {
1307         const struct timespec timeout = { 0, 100000000 };  /* 0.1s */
1308 #define MAX_PAGER_ARGS 16
1309         char            *argv[MAX_PAGER_ARGS];
1310         const char      *pager;
1311         char            *cp;
1312 #if HAVE_LESS_T
1313         size_t           cmdlen;
1314 #endif
1315         int              argc, use_ofn;
1316         pid_t            pager_pid;
1317
1318         assert(outst->tag_files->ofd == -1);
1319         assert(outst->tag_files->tfs == NULL);
1320
1321         pager = getenv("MANPAGER");
1322         if (pager == NULL || *pager == '\0')
1323                 pager = getenv("PAGER");
1324         if (pager == NULL || *pager == '\0')
1325                 pager = BINM_PAGER;
1326         cp = mandoc_strdup(pager);
1327
1328         /*
1329          * Parse the pager command into words.
1330          * Intentionally do not do anything fancy here.
1331          */
1332
1333         argc = 0;
1334         while (argc + 5 < MAX_PAGER_ARGS) {
1335                 argv[argc++] = cp;
1336                 cp = strchr(cp, ' ');
1337                 if (cp == NULL)
1338                         break;
1339                 *cp++ = '\0';
1340                 while (*cp == ' ')
1341                         cp++;
1342                 if (*cp == '\0')
1343                         break;
1344         }
1345
1346         /* For less(1), use the tag file. */
1347
1348         use_ofn = 1;
1349 #if HAVE_LESS_T
1350         if (*outst->tag_files->tfn != '\0' &&
1351             (cmdlen = strlen(argv[0])) >= 4) {
1352                 cp = argv[0] + cmdlen - 4;
1353                 if (strcmp(cp, "less") == 0) {
1354                         argv[argc++] = mandoc_strdup("-T");
1355                         argv[argc++] = outst->tag_files->tfn;
1356                         if (tag_target != NULL) {
1357                                 argv[argc++] = mandoc_strdup("-t");
1358                                 argv[argc++] = tag_target;
1359                                 use_ofn = 0;
1360                         }
1361                 }
1362         }
1363 #endif
1364         if (use_ofn) {
1365                 if (outst->outtype == OUTT_HTML && tag_target != NULL)
1366                         mandoc_asprintf(&argv[argc], "file://%s#%s",
1367                             outst->tag_files->ofn, tag_target);
1368                 else
1369                         argv[argc] = outst->tag_files->ofn;
1370                 argc++;
1371         }
1372         argv[argc] = NULL;
1373
1374         switch (pager_pid = fork()) {
1375         case -1:
1376                 mandoc_msg(MANDOCERR_FORK, 0, 0, "%s", strerror(errno));
1377                 exit(mandoc_msg_getrc());
1378         case 0:
1379                 break;
1380         default:
1381                 (void)setpgid(pager_pid, 0);
1382                 (void)tcsetpgrp(STDOUT_FILENO, pager_pid);
1383 #if HAVE_PLEDGE
1384                 if (pledge("stdio rpath tmppath tty proc", NULL) == -1) {
1385                         mandoc_msg(MANDOCERR_PLEDGE, 0, 0,
1386                             "%s", strerror(errno));
1387                         exit(mandoc_msg_getrc());
1388                 }
1389 #endif
1390                 outst->tag_files->pager_pid = pager_pid;
1391                 return pager_pid;
1392         }
1393
1394         /*
1395          * The child process becomes the pager.
1396          * Do not start it before controlling the terminal.
1397          */
1398
1399         while (tcgetpgrp(STDOUT_FILENO) != getpid())
1400                 nanosleep(&timeout, NULL);
1401
1402         execvp(argv[0], argv);
1403         mandoc_msg(MANDOCERR_EXEC, 0, 0, "%s: %s", argv[0], strerror(errno));
1404         _exit(mandoc_msg_getrc());
1405 }