contrib/mdocml/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                         defpaths = optarg;
 275                         break;
 276                 case 'm':
 277                         auxpaths = optarg;
 278                         break;
 279                 case 'O':
 280                         oarg = optarg;
 281                         break;
 282                 case 'S':
 283                         search.arch = optarg;
 284                         break;
 285                 case 's':
 286                         search.sec = optarg;
 287                         break;
 288                 case 'T':
 289                         if (strcmp(optarg, "ascii") == 0)
 290                                 outst.outtype = OUTT_ASCII;
 291                         else if (strcmp(optarg, "lint") == 0) {
 292                                 outst.outtype = OUTT_LINT;
 293                                 mandoc_msg_setoutfile(stdout);
 294                                 mandoc_msg_setmin(MANDOCERR_BASE);
 295                         } else if (strcmp(optarg, "tree") == 0)
 296                                 outst.outtype = OUTT_TREE;
 297                         else if (strcmp(optarg, "man") == 0)
 298                                 outst.outtype = OUTT_MAN;
 299                         else if (strcmp(optarg, "html") == 0)
 300                                 outst.outtype = OUTT_HTML;
 301                         else if (strcmp(optarg, "markdown") == 0)
 302                                 outst.outtype = OUTT_MARKDOWN;
 303                         else if (strcmp(optarg, "utf8") == 0)
 304                                 outst.outtype = OUTT_UTF8;
 305                         else if (strcmp(optarg, "locale") == 0)
 306                                 outst.outtype = OUTT_LOCALE;
 307                         else if (strcmp(optarg, "ps") == 0)
 308                                 outst.outtype = OUTT_PS;
 309                         else if (strcmp(optarg, "pdf") == 0)
 310                                 outst.outtype = OUTT_PDF;
 311                         else {
 312                                 mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0,
 313                                     "-T %s", optarg);
 314                                 return mandoc_msg_getrc();
 315                         }
 316                         break;
 317                 case 'W':
 318                         if (woptions(optarg, &os_e, &outst.wstop) == -1)
 319                                 return mandoc_msg_getrc();
 320                         break;
 321                 case 'w':
 322                         outmode = OUTMODE_FLN;
 323                         break;
 324                 default:
 325                         show_usage = 1;
 326                         break;
 327                 }
 328         }
 329
 330         if (show_usage)
 331                 usage(search.argmode);
 332
 333         /* Postprocess options. */
 334
 335         switch (outmode) {
 336         case OUTMODE_DEF:
 337                 switch (search.argmode) {
 338                 case ARG_FILE:
 339                         outmode = OUTMODE_ALL;
 340                         outst.use_pager = 0;
 341                         break;
 342                 case ARG_NAME:
 343                         outmode = OUTMODE_ONE;
 344                         break;
 345                 default:
 346                         outmode = OUTMODE_LST;
 347                         break;
 348                 }
 349                 break;
 350         case OUTMODE_FLN:
 351                 if (search.argmode == ARG_FILE)
 352                         outmode = OUTMODE_ALL;
 353                 break;
 354         case OUTMODE_ALL:
 355                 break;
 356         case OUTMODE_LST:
 357         case OUTMODE_ONE:
 358                 abort();
 359         }
 360
 361         if (oarg != NULL) {
 362                 if (outmode == OUTMODE_LST)
 363                         search.outkey = oarg;
 364                 else {
 365                         while (oarg != NULL) {
 366                                 if (manconf_output(&conf.output,
 367                                     strsep(&oarg, ","), 0) == -1)
 368                                         return mandoc_msg_getrc();
 369                         }
 370                 }
 371         }
 372
 373         if (outst.outtype != OUTT_TREE || conf.output.noval == 0)
 374                 options |= MPARSE_VALIDATE;
 375
 376         if (outmode == OUTMODE_FLN ||
 377             outmode == OUTMODE_LST ||
 378             (conf.output.outfilename == NULL &&
 379              conf.output.tagfilename == NULL &&
 380              isatty(STDOUT_FILENO) == 0))
 381                 outst.use_pager = 0;
 382
 383         if (outst.use_pager &&
 384             (conf.output.width == 0 || conf.output.indent == 0) &&
 385             ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1 &&
 386             ws.ws_col > 1) {
 387                 if (conf.output.width == 0 && ws.ws_col < 79)
 388                         conf.output.width = ws.ws_col - 1;
 389                 if (conf.output.indent == 0 && ws.ws_col < 66)
 390                         conf.output.indent = 3;
 391         }
 392
 393 #if HAVE_PLEDGE
 394         if (outst.use_pager == 0)
 395                 c = pledge("stdio rpath", NULL);
 396         else if (conf.output.outfilename != NULL ||
 397             conf.output.tagfilename != NULL)
 398                 c = pledge("stdio rpath wpath cpath", NULL);
 399         else
 400                 c = pledge("stdio rpath tmppath tty proc exec", NULL);
 401         if (c == -1) {
 402                 mandoc_msg(MANDOCERR_PLEDGE, 0, 0, "%s", strerror(errno));
 403                 return mandoc_msg_getrc();
 404         }
 405 #endif
 406
 407         /* Parse arguments. */
 408
 409         if (argc > 0) {
 410                 argc -= optind;
 411                 argv += optind;
 412         }
 413
 414         /*
 415          * Quirks for help(1) and man(1),
 416          * in particular for a section argument without -s.
 417          */
 418
 419         if (search.argmode == ARG_NAME) {
 420                 if (*progname == 'h') {
 421                         if (argc == 0) {
 422                                 argv = help_argv;
 423                                 argc = 1;
 424                         }
 425                 } else if (argc > 1 &&
 426                     ((uc = (unsigned char *)argv[0]) != NULL) &&
 427                     ((isdigit(uc[0]) && (uc[1] == '\0' ||
 428                       isalpha(uc[1]))) ||
 429                      (uc[0] == 'n' && uc[1] == '\0'))) {
 430                         search.sec = (char *)uc;
 431                         argv++;
 432                         argc--;
 433                 }
 434                 if (search.arch == NULL)
 435                         search.arch = getenv("MACHINE");
 436 #ifdef MACHINE
 437                 if (search.arch == NULL)
 438                         search.arch = MACHINE;
 439 #endif
 440                 if (outmode == OUTMODE_ONE)
 441                         search.firstmatch = 1;
 442         }
 443
 444         /*
 445          * Use the first argument for -O tag in addition to
 446          * using it as a search term for man(1) or apropos(1).
 447          */
 448
 449         if (conf.output.tag != NULL && *conf.output.tag == '\0') {
 450                 tagarg = argc > 0 && search.argmode == ARG_EXPR ?
 451                     strchr(*argv, '=') : NULL;
 452                 conf.output.tag = tagarg == NULL ? *argv : tagarg + 1;
 453         }
 454
 455         /* Read the configuration file. */
 456
 457         if (search.argmode != ARG_FILE ||
 458             mandoc_msg_getmin() == MANDOCERR_STYLE)
 459                 manconf_parse(&conf, conf_file, defpaths, auxpaths);
 460
 461         /* man(1): Resolve each name individually. */
 462
 463         if (search.argmode == ARG_NAME) {
 464                 if (argc < 1) {
 465                         if (outmode != OUTMODE_FLN)
 466                                 usage(ARG_NAME);
 467                         if (conf.manpath.sz == 0) {
 468                                 warnx("The manpath is empty.");
 469                                 mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 470                         } else {
 471                                 for (i = 0; i + 1 < conf.manpath.sz; i++)
 472                                         printf("%s:", conf.manpath.paths[i]);
 473                                 printf("%s\n", conf.manpath.paths[i]);
 474                         }
 475                         manconf_free(&conf);
 476                         return (int)mandoc_msg_getrc();
 477                 }
 478                 for (res = NULL, ressz = 0; argc > 0; argc--, argv++) {
 479                         (void)mansearch(&search, &conf.manpath,
 480                             1, argv, &resn, &resnsz);
 481                         if (resnsz == 0)
 482                                 (void)fs_search(&search, &conf.manpath,
 483                                     *argv, &resn, &resnsz);
 484                         if (resnsz == 0 && strchr(*argv, '/') == NULL) {
 485                                 if (search.arch != NULL &&
 486                                     arch_valid(search.arch, OSENUM) == 0)
 487                                         warnx("Unknown architecture \"%s\".",
 488                                             search.arch);
 489                                 else if (search.sec != NULL)
 490                                         warnx("No entry for %s in "
 491                                             "section %s of the manual.",
 492                                             *argv, search.sec);
 493                                 else
 494                                         warnx("No entry for %s in "
 495                                             "the manual.", *argv);
 496                                 mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 497                                 continue;
 498                         }
 499                         if (resnsz == 0) {
 500                                 if (access(*argv, R_OK) == -1) {
 501                                         mandoc_msg_setinfilename(*argv);
 502                                         mandoc_msg(MANDOCERR_BADARG_BAD,
 503                                             0, 0, "%s", strerror(errno));
 504                                         mandoc_msg_setinfilename(NULL);
 505                                         continue;
 506                                 }
 507                                 resnsz = 1;
 508                                 resn = mandoc_calloc(resnsz, sizeof(*res));
 509                                 resn->file = mandoc_strdup(*argv);
 510                                 resn->ipath = SIZE_MAX;
 511                                 resn->form = FORM_SRC;
 512                         }
 513                         if (outmode != OUTMODE_ONE || resnsz == 1) {
 514                                 res = mandoc_reallocarray(res,
 515                                     ressz + resnsz, sizeof(*res));
 516                                 memcpy(res + ressz, resn,
 517                                     sizeof(*resn) * resnsz);
 518                                 ressz += resnsz;
 519                                 continue;
 520                         }
 521
 522                         /* Search for the best section. */
 523
 524                         best_prio = 40;
 525                         for (ib = i = 0; i < resnsz; i++) {
 526                                 sec = resn[i].file;
 527                                 sec += strcspn(sec, "123456789");
 528                                 if (sec[0] == '\0')
 529                                         continue; /* No section at all. */
 530                                 prio = sec_prios[sec[0] - '1'];
 531                                 if (search.sec != NULL) {
 532                                         ssz = strlen(search.sec);
 533                                         if (strncmp(sec, search.sec, ssz) == 0)
 534                                                 sec += ssz;
 535                                 } else
 536                                         sec++; /* Prefer without suffix. */
 537                                 if (*sec != '/')
 538                                         prio += 10; /* Wrong dir name. */
 539                                 if (search.sec != NULL) {
 540                                         ep = strchr(sec, '\0');
 541                                         if (ep - sec > 3 &&
 542                                             strncmp(ep - 3, ".gz", 3) == 0)
 543                                                 ep -= 3;
 544                                         if ((size_t)(ep - sec) < ssz + 3 ||
 545                                             strncmp(ep - ssz, search.sec,
 546                                              ssz) != 0)      /* Wrong file */
 547                                                 prio += 20;  /* extension. */
 548                                 }
 549                                 if (prio >= best_prio)
 550                                         continue;
 551                                 best_prio = prio;
 552                                 ib = i;
 553                         }
 554                         res = mandoc_reallocarray(res, ressz + 1,
 555                             sizeof(*res));
 556                         memcpy(res + ressz++, resn + ib, sizeof(*resn));
 557                 }
 558
 559         /* apropos(1), whatis(1): Process the full search expression. */
 560
 561         } else if (search.argmode != ARG_FILE) {
 562                 if (mansearch(&search, &conf.manpath,
 563                     argc, argv, &res, &ressz) == 0)
 564                         usage(search.argmode);
 565
 566                 if (ressz == 0) {
 567                         warnx("nothing appropriate");
 568                         mandoc_msg_setrc(MANDOCLEVEL_BADARG);
 569                         goto out;
 570                 }
 571
 572         /* mandoc(1): Take command line arguments as file names. */
 573
 574         } else {
 575                 ressz = argc > 0 ? argc : 1;
 576                 res = mandoc_calloc(ressz, sizeof(*res));
 577                 for (i = 0; i < ressz; i++) {
 578                         if (argc > 0)
 579                                 res[i].file = mandoc_strdup(argv[i]);
 580                         res[i].ipath = SIZE_MAX;
 581                         res[i].form = FORM_SRC;
 582                 }
 583         }
 584
 585         switch (outmode) {
 586         case OUTMODE_FLN:
 587                 for (i = 0; i < ressz; i++)
 588                         puts(res[i].file);
 589                 goto out;
 590         case OUTMODE_LST:
 591                 for (i = 0; i < ressz; i++)
 592                         printf("%s - %s\n", res[i].names,
 593                             res[i].output == NULL ? "" :
 594                             res[i].output);
 595                 goto out;
 596         default:
 597                 break;
 598         }
 599
 600         if (search.argmode == ARG_FILE && auxpaths != NULL) {
 601                 if (strcmp(auxpaths, "doc") == 0)
 602                         options |= MPARSE_MDOC;
 603                 else if (strcmp(auxpaths, "an") == 0)
 604                         options |= MPARSE_MAN;
 605         }
 606
 607         mchars_alloc();
 608         mp = mparse_alloc(options, os_e, os_s);
 609
 610         /*
 611          * Remember the original working directory, if possible.
 612          * This will be needed if some names on the command line
 613          * are page names and some are relative file names.
 614          * Do not error out if the current directory is not
 615          * readable: Maybe it won't be needed after all.
 616          */
 617         startdir = open(".", O_RDONLY | O_DIRECTORY);
 618         for (i = 0; i < ressz; i++) {
 619                 process_onefile(mp, res + i, startdir, &outst, &conf);
 620                 if (outst.wstop && mandoc_msg_getrc() != MANDOCLEVEL_OK)
 621                         break;
 622         }
 623         if (startdir != -1) {
 624                 (void)fchdir(startdir);
 625                 close(startdir);
 626         }
 627         if (conf.output.tag != NULL && conf.output.tag_found == 0) {
 628                 mandoc_msg(MANDOCERR_TAG, 0, 0, "%s", conf.output.tag);
 629                 conf.output.tag = NULL;
 630         }
 631         if (outst.outdata != NULL) {
 632                 switch (outst.outtype) {
 633                 case OUTT_HTML:
 634                         html_free(outst.outdata);
 635                         break;
 636                 case OUTT_UTF8:
 637                 case OUTT_LOCALE:
 638                 case OUTT_ASCII:
 639                         ascii_free(outst.outdata);
 640                         break;
 641                 case OUTT_PDF:
 642                 case OUTT_PS:
 643                         pspdf_free(outst.outdata);
 644                         break;
 645                 default:
 646                         break;
 647                 }
 648         }
 649         mandoc_xr_free();
 650         mparse_free(mp);
 651         mchars_free();
 652
 653 out:
 654         mansearch_free(res, ressz);
 655         if (search.argmode != ARG_FILE)
 656                 manconf_free(&conf);
 657
 658         if (outst.tag_files != NULL) {
 659                 if (term_tag_close() != -1 &&
 660                     conf.output.outfilename == NULL &&
 661                     conf.output.tagfilename == NULL)
 662                         run_pager(&outst, conf.output.tag);
 663                 term_tag_unlink();
 664         } else if (outst.had_output && outst.outtype != OUTT_LINT)
 665                 mandoc_msg_summary();
 666
 667         return (int)mandoc_msg_getrc();
 668 }
 669
 670 static void
 671 usage(enum argmode argmode)
 672 {
 673         switch (argmode) {
 674         case ARG_FILE:
 675                 fputs("usage: mandoc [-ac] [-I os=name] "
 676                     "[-K encoding] [-mdoc | -man] [-O options]\n"
 677                     "\t      [-T output] [-W level] [file ...]\n", stderr);
 678                 break;
 679         case ARG_NAME:
 680                 fputs("usage: man [-acfhklw] [-C file] [-M path] "
 681                     "[-m path] [-S subsection]\n"
 682                     "\t   [[-s] section] name ...\n", stderr);
 683                 break;
 684         case ARG_WORD:
 685                 fputs("usage: whatis [-afk] [-C file] "
 686                     "[-M path] [-m path] [-O outkey] [-S arch]\n"
 687                     "\t      [-s section] name ...\n", stderr);
 688                 break;
 689         case ARG_EXPR:
 690                 fputs("usage: apropos [-afk] [-C file] "
 691                     "[-M path] [-m path] [-O outkey] [-S arch]\n"
 692                     "\t       [-s section] expression ...\n", stderr);
 693                 break;
 694         }
 695         exit((int)MANDOCLEVEL_BADARG);
 696 }
 697
 698 static void
 699 glob_esc(char **dst, const char *src, const char *suffix)
 700 {
 701         while (*src != '\0') {
 702                 if (strchr("*?[", *src) != NULL)
 703                         *(*dst)++ = '\\';
 704                 *(*dst)++ = *src++;
 705         }
 706         while (*suffix != '\0')
 707                 *(*dst)++ = *suffix++;
 708 }
 709
 710 static void
 711 fs_append(char **file, size_t filesz, int copy, size_t ipath,
 712     const char *sec, enum form form, struct manpage **res, size_t *ressz)
 713 {
 714         struct manpage  *page;
 715
 716         *res = mandoc_reallocarray(*res, *ressz + filesz, sizeof(**res));
 717         page = *res + *ressz;
 718         *ressz += filesz;
 719         for (;;) {
 720                 page->file = copy ? mandoc_strdup(*file) : *file;
 721                 page->names = NULL;
 722                 page->output = NULL;
 723                 page->bits = NAME_FILE & NAME_MASK;
 724                 page->ipath = ipath;
 725                 page->sec = (*sec >= '1' && *sec <= '9') ? *sec - '1' + 1 : 10;
 726                 page->form = form;
 727                 if (--filesz == 0)
 728                         break;
 729                 file++;
 730                 page++;
 731         }
 732 }
 733
 734 static int
 735 fs_lookup(const struct manpaths *paths, size_t ipath,
 736         const char *sec, const char *arch, const char *name,
 737         struct manpage **res, size_t *ressz)
 738 {
 739         struct stat      sb;
 740         glob_t           globinfo;
 741         char            *file, *cp, secnum[2];
 742         int              globres;
 743         enum form        form;
 744
 745         const char *const slman = "/man";
 746         const char *const slash = "/";
 747         const char *const sglob = ".[01-9]*";
 748         const char *const dot   = ".";
 749         const char *const aster = "*";
 750
 751         memset(&globinfo, 0, sizeof(globinfo));
 752         form = FORM_SRC;
 753
 754         mandoc_asprintf(&file, "%s/man%s/%s.%s",
 755             paths->paths[ipath], sec, name, sec);
 756         if (stat(file, &sb) != -1)
 757                 goto found;
 758         free(file);
 759
 760         mandoc_asprintf(&file, "%s/cat%s/%s.0",
 761             paths->paths[ipath], sec, name);
 762         if (stat(file, &sb) != -1) {
 763                 form = FORM_CAT;
 764                 goto found;
 765         }
 766         free(file);
 767
 768         if (arch != NULL) {
 769                 mandoc_asprintf(&file, "%s/man%s/%s/%s.%s",
 770                     paths->paths[ipath], sec, arch, name, sec);
 771                 if (stat(file, &sb) != -1)
 772                         goto found;
 773                 free(file);
 774         }
 775
 776         cp = file = mandoc_malloc(strlen(paths->paths[ipath]) * 2 +
 777             strlen(slman) + strlen(sec) * 2 + strlen(slash) +
 778             strlen(name) * 2 + strlen(sglob) + 1);
 779         glob_esc(&cp, paths->paths[ipath], slman);
 780         glob_esc(&cp, sec, slash);
 781         glob_esc(&cp, name, sglob);
 782         *cp = '\0';
 783         globres = glob(file, 0, NULL, &globinfo);
 784         if (globres != 0 && globres != GLOB_NOMATCH)
 785                 mandoc_msg(MANDOCERR_GLOB, 0, 0,
 786                     "%s: %s", file, strerror(errno));
 787         free(file);
 788         file = NULL;
 789         if (globres == 0)
 790                 goto found;
 791         globfree(&globinfo);
 792
 793         if (sec[1] != '\0' && *ressz == 0) {
 794                 secnum[0] = sec[0];
 795                 secnum[1] = '\0';
 796                 cp = file = mandoc_malloc(strlen(paths->paths[ipath]) * 2 +
 797                     strlen(slman) + strlen(secnum) * 2 + strlen(slash) +
 798                     strlen(name) * 2 + strlen(dot) +
 799                     strlen(sec) * 2 + strlen(aster) + 1);
 800                 glob_esc(&cp, paths->paths[ipath], slman);
 801                 glob_esc(&cp, secnum, slash);
 802                 glob_esc(&cp, name, dot);
 803                 glob_esc(&cp, sec, aster);
 804                 *cp = '\0';
 805                 globres = glob(file, 0, NULL, &globinfo);
 806                 if (globres != 0 && globres != GLOB_NOMATCH)
 807                         mandoc_msg(MANDOCERR_GLOB, 0, 0,
 808                             "%s: %s", file, strerror(errno));
 809                 free(file);
 810                 file = NULL;
 811                 if (globres == 0)
 812                         goto found;
 813                 globfree(&globinfo);
 814         }
 815
 816         if (res != NULL || ipath + 1 != paths->sz)
 817                 return -1;
 818
 819         mandoc_asprintf(&file, "%s.%s", name, sec);
 820         globres = stat(file, &sb);
 821         free(file);
 822         return globres;
 823
 824 found:
 825         warnx("outdated mandoc.db lacks %s(%s) entry, run %s %s",
 826             name, sec, BINM_MAKEWHATIS, paths->paths[ipath]);
 827         if (res == NULL)
 828                 free(file);
 829         else if (file == NULL)
 830                 fs_append(globinfo.gl_pathv, globinfo.gl_pathc, 1,
 831                     ipath, sec, form, res, ressz);
 832         else
 833                 fs_append(&file, 1, 0, ipath, sec, form, res, ressz);
 834         globfree(&globinfo);
 835         return 0;
 836 }
 837
 838 static int
 839 fs_search(const struct mansearch *cfg, const struct manpaths *paths,
 840         const char *name, struct manpage **res, size_t *ressz)
 841 {
 842         const char *const sections[] =
 843             {"1", "8", "6", "2", "3", "5", "7", "4", "9", "3p"};
 844         const size_t nsec = sizeof(sections)/sizeof(sections[0]);
 845
 846         size_t           ipath, isec;
 847
 848         assert(cfg->argmode == ARG_NAME);
 849         if (res != NULL)
 850                 *res = NULL;
 851         *ressz = 0;
 852         for (ipath = 0; ipath < paths->sz; ipath++) {
 853                 if (cfg->sec != NULL) {
 854                         if (fs_lookup(paths, ipath, cfg->sec, cfg->arch,
 855                             name, res, ressz) != -1 && cfg->firstmatch)
 856                                 return 0;
 857                 } else {
 858                         for (isec = 0; isec < nsec; isec++)
 859                                 if (fs_lookup(paths, ipath, sections[isec],
 860                                     cfg->arch, name, res, ressz) != -1 &&
 861                                     cfg->firstmatch)
 862                                         return 0;
 863                 }
 864         }
 865         return -1;
 866 }
 867
 868 static void
 869 process_onefile(struct mparse *mp, struct manpage *resp, int startdir,
 870     struct outstate *outst, struct manconf *conf)
 871 {
 872         int      fd;
 873
 874         /*
 875          * Changing directories is not needed in ARG_FILE mode.
 876          * Do it on a best-effort basis.  Even in case of
 877          * failure, some functionality may still work.
 878          */
 879         if (resp->ipath != SIZE_MAX)
 880                 (void)chdir(conf->manpath.paths[resp->ipath]);
 881         else if (startdir != -1)
 882                 (void)fchdir(startdir);
 883
 884         mandoc_msg_setinfilename(resp->file);
 885         if (resp->file != NULL) {
 886                 if ((fd = mparse_open(mp, resp->file)) == -1) {
 887                         mandoc_msg(resp->ipath == SIZE_MAX ?
 888                             MANDOCERR_BADARG_BAD : MANDOCERR_OPEN,
 889                             0, 0, "%s", strerror(errno));
 890                         mandoc_msg_setinfilename(NULL);
 891                         return;
 892                 }
 893         } else
 894                 fd = STDIN_FILENO;
 895
 896         if (outst->use_pager) {
 897                 outst->use_pager = 0;
 898                 outst->tag_files = term_tag_init(conf->output.outfilename,
 899                     outst->outtype == OUTT_HTML ? ".html" : "",
 900                     conf->output.tagfilename);
 901 #if HAVE_PLEDGE
 902                 if ((conf->output.outfilename != NULL ||
 903                      conf->output.tagfilename != NULL) &&
 904                     pledge("stdio rpath cpath", NULL) == -1) {
 905                         mandoc_msg(MANDOCERR_PLEDGE, 0, 0,
 906                             "%s", strerror(errno));
 907                         exit(mandoc_msg_getrc());
 908                 }
 909 #endif
 910         }
 911         if (outst->had_output && outst->outtype <= OUTT_UTF8) {
 912                 if (outst->outdata == NULL)
 913                         outdata_alloc(outst, &conf->output);
 914                 terminal_sepline(outst->outdata);
 915         }
 916
 917         if (resp->form == FORM_SRC)
 918                 parse(mp, fd, resp->file, outst, conf);
 919         else {
 920                 passthrough(fd, conf->output.synopsisonly);
 921                 outst->had_output = 1;
 922         }
 923
 924         if (ferror(stdout)) {
 925                 if (outst->tag_files != NULL) {
 926                         mandoc_msg(MANDOCERR_WRITE, 0, 0, "%s: %s",
 927                             outst->tag_files->ofn, strerror(errno));
 928                         term_tag_unlink();
 929                         outst->tag_files = NULL;
 930                 } else
 931                         mandoc_msg(MANDOCERR_WRITE, 0, 0, "%s",
 932                             strerror(errno));
 933         }
 934         mandoc_msg_setinfilename(NULL);
 935 }
 936
 937 static void
 938 parse(struct mparse *mp, int fd, const char *file,
 939     struct outstate *outst, struct manconf *conf)
 940 {
 941         static struct manpaths   basepaths;
 942         static int               previous;
 943         struct roff_meta        *meta;
 944
 945         assert(fd >= 0);
 946         if (file == NULL)
 947                 file = "<stdin>";
 948
 949         if (previous)
 950                 mparse_reset(mp);
 951         else
 952                 previous = 1;
 953
 954         mparse_readfd(mp, fd, file);
 955         if (fd != STDIN_FILENO)
 956                 close(fd);
 957
 958         /*
 959          * With -Wstop and warnings or errors of at least the requested
 960          * level, do not produce output.
 961          */
 962
 963         if (outst->wstop && mandoc_msg_getrc() != MANDOCLEVEL_OK)
 964                 return;
 965
 966         if (outst->outdata == NULL)
 967                 outdata_alloc(outst, &conf->output);
 968         else if (outst->outtype == OUTT_HTML)
 969                 html_reset(outst->outdata);
 970
 971         mandoc_xr_reset();
 972         meta = mparse_result(mp);
 973
 974         /* Execute the out device, if it exists. */
 975
 976         outst->had_output = 1;
 977         if (meta->macroset == MACROSET_MDOC) {
 978                 switch (outst->outtype) {
 979                 case OUTT_HTML:
 980                         html_mdoc(outst->outdata, meta);
 981                         break;
 982                 case OUTT_TREE:
 983                         tree_mdoc(outst->outdata, meta);
 984                         break;
 985                 case OUTT_MAN:
 986                         man_mdoc(outst->outdata, meta);
 987                         break;
 988                 case OUTT_PDF:
 989                 case OUTT_ASCII:
 990                 case OUTT_UTF8:
 991                 case OUTT_LOCALE:
 992                 case OUTT_PS:
 993                         terminal_mdoc(outst->outdata, meta);
 994                         break;
 995                 case OUTT_MARKDOWN:
 996                         markdown_mdoc(outst->outdata, meta);
 997                         break;
 998                 default:
 999                         break;
1000                 }
1001         }
1002         if (meta->macroset == MACROSET_MAN) {
1003                 switch (outst->outtype) {
1004                 case OUTT_HTML:
1005                         html_man(outst->outdata, meta);
1006                         break;
1007                 case OUTT_TREE:
1008                         tree_man(outst->outdata, meta);
1009                         break;
1010                 case OUTT_MAN:
1011                         mparse_copy(mp);
1012                         break;
1013                 case OUTT_PDF:
1014                 case OUTT_ASCII:
1015                 case OUTT_UTF8:
1016                 case OUTT_LOCALE:
1017                 case OUTT_PS:
1018                         terminal_man(outst->outdata, meta);
1019                         break;
1020                 case OUTT_MARKDOWN:
1021                         mandoc_msg(MANDOCERR_MAN_TMARKDOWN, 0, 0, NULL);
1022                         break;
1023                 default:
1024                         break;
1025                 }
1026         }
1027         if (conf->output.tag != NULL && conf->output.tag_found == 0 &&
1028             tag_exists(conf->output.tag))
1029                 conf->output.tag_found = 1;
1030
1031         if (mandoc_msg_getmin() < MANDOCERR_STYLE) {
1032                 if (basepaths.sz == 0)
1033                         manpath_base(&basepaths);
1034                 check_xr(&basepaths);
1035         } else if (mandoc_msg_getmin() < MANDOCERR_WARNING)
1036                 check_xr(&conf->manpath);
1037 }
1038
1039 static void
1040 check_xr(struct manpaths *paths)
1041 {
1042         struct mansearch         search;
1043         struct mandoc_xr        *xr;
1044         size_t                   sz;
1045
1046         for (xr = mandoc_xr_get(); xr != NULL; xr = xr->next) {
1047                 if (xr->line == -1)
1048                         continue;
1049                 search.arch = NULL;
1050                 search.sec = xr->sec;
1051                 search.outkey = NULL;
1052                 search.argmode = ARG_NAME;
1053                 search.firstmatch = 1;
1054                 if (mansearch(&search, paths, 1, &xr->name, NULL, &sz))
1055                         continue;
1056                 if (fs_search(&search, paths, xr->name, NULL, &sz) != -1)
1057                         continue;
1058                 if (xr->count == 1)
1059                         mandoc_msg(MANDOCERR_XR_BAD, xr->line,
1060                             xr->pos + 1, "Xr %s %s", xr->name, xr->sec);
1061                 else
1062                         mandoc_msg(MANDOCERR_XR_BAD, xr->line,
1063                             xr->pos + 1, "Xr %s %s (%d times)",
1064                             xr->name, xr->sec, xr->count);
1065         }
1066 }
1067
1068 static void
1069 outdata_alloc(struct outstate *outst, struct manoutput *outconf)
1070 {
1071         switch (outst->outtype) {
1072         case OUTT_HTML:
1073                 outst->outdata = html_alloc(outconf);
1074                 break;
1075         case OUTT_UTF8:
1076                 outst->outdata = utf8_alloc(outconf);
1077                 break;
1078         case OUTT_LOCALE:
1079                 outst->outdata = locale_alloc(outconf);
1080                 break;
1081         case OUTT_ASCII:
1082                 outst->outdata = ascii_alloc(outconf);
1083                 break;
1084         case OUTT_PDF:
1085                 outst->outdata = pdf_alloc(outconf);
1086                 break;
1087         case OUTT_PS:
1088                 outst->outdata = ps_alloc(outconf);
1089                 break;
1090         default:
1091                 break;
1092         }
1093 }
1094
1095 static void
1096 passthrough(int fd, int synopsis_only)
1097 {
1098         const char       synb[] = "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS";
1099         const char       synr[] = "SYNOPSIS";
1100
1101         FILE            *stream;
1102         char            *line, *cp;
1103         size_t           linesz;
1104         ssize_t          len, written;
1105         int              lno, print;
1106
1107         stream = NULL;
1108         line = NULL;
1109         linesz = 0;
1110
1111         if (fflush(stdout) == EOF) {
1112                 mandoc_msg(MANDOCERR_FFLUSH, 0, 0, "%s", strerror(errno));
1113                 goto done;
1114         }
1115         if ((stream = fdopen(fd, "r")) == NULL) {
1116                 close(fd);
1117                 mandoc_msg(MANDOCERR_FDOPEN, 0, 0, "%s", strerror(errno));
1118                 goto done;
1119         }
1120
1121         lno = print = 0;
1122         while ((len = getline(&line, &linesz, stream)) != -1) {
1123                 lno++;
1124                 cp = line;
1125                 if (synopsis_only) {
1126                         if (print) {
1127                                 if ( ! isspace((unsigned char)*cp))
1128                                         goto done;
1129                                 while (isspace((unsigned char)*cp)) {
1130                                         cp++;
1131                                         len--;
1132                                 }
1133                         } else {
1134                                 if (strcmp(cp, synb) == 0 ||
1135                                     strcmp(cp, synr) == 0)
1136                                         print = 1;
1137                                 continue;
1138                         }
1139                 }
1140                 for (; len > 0; len -= written) {
1141                         if ((written = write(STDOUT_FILENO, cp, len)) == -1) {
1142                                 mandoc_msg(MANDOCERR_WRITE, 0, 0,
1143                                     "%s", strerror(errno));
1144                                 goto done;
1145                         }
1146                 }
1147         }
1148         if (ferror(stream))
1149                 mandoc_msg(MANDOCERR_GETLINE, lno, 0, "%s", strerror(errno));
1150
1151 done:
1152         free(line);
1153         if (stream != NULL)
1154                 fclose(stream);
1155 }
1156
1157 static int
1158 woptions(char *arg, enum mandoc_os *os_e, int *wstop)
1159 {
1160         char            *v, *o;
1161         const char      *toks[11];
1162
1163         toks[0] = "stop";
1164         toks[1] = "all";
1165         toks[2] = "base";
1166         toks[3] = "style";
1167         toks[4] = "warning";
1168         toks[5] = "error";
1169         toks[6] = "unsupp";
1170         toks[7] = "fatal";
1171         toks[8] = "openbsd";
1172         toks[9] = "netbsd";
1173         toks[10] = NULL;
1174
1175         while (*arg) {
1176                 o = arg;
1177                 switch (getsubopt(&arg, (char * const *)toks, &v)) {
1178                 case 0:
1179                         *wstop = 1;
1180                         break;
1181                 case 1:
1182                 case 2:
1183                         mandoc_msg_setmin(MANDOCERR_BASE);
1184                         break;
1185                 case 3:
1186                         mandoc_msg_setmin(MANDOCERR_STYLE);
1187                         break;
1188                 case 4:
1189                         mandoc_msg_setmin(MANDOCERR_WARNING);
1190                         break;
1191                 case 5:
1192                         mandoc_msg_setmin(MANDOCERR_ERROR);
1193                         break;
1194                 case 6:
1195                         mandoc_msg_setmin(MANDOCERR_UNSUPP);
1196                         break;
1197                 case 7:
1198                         mandoc_msg_setmin(MANDOCERR_BADARG);
1199                         break;
1200                 case 8:
1201                         mandoc_msg_setmin(MANDOCERR_BASE);
1202                         *os_e = MANDOC_OS_OPENBSD;
1203                         break;
1204                 case 9:
1205                         mandoc_msg_setmin(MANDOCERR_BASE);
1206                         *os_e = MANDOC_OS_NETBSD;
1207                         break;
1208                 default:
1209                         mandoc_msg(MANDOCERR_BADARG_BAD, 0, 0, "-W %s", o);
1210                         return -1;
1211                 }
1212         }
1213         return 0;
1214 }
1215
1216 /*
1217  * Wait until moved to the foreground,
1218  * then fork the pager and wait for the user to close it.
1219  */
1220 static void
1221 run_pager(struct outstate *outst, char *tag_target)
1222 {
1223         int      signum, status;
1224         pid_t    man_pgid, tc_pgid;
1225         pid_t    pager_pid, wait_pid;
1226
1227         man_pgid = getpgid(0);
1228         outst->tag_files->tcpgid =
1229             man_pgid == getpid() ? getpgid(getppid()) : man_pgid;
1230         pager_pid = 0;
1231         signum = SIGSTOP;
1232
1233         for (;;) {
1234                 /* Stop here until moved to the foreground. */
1235
1236                 tc_pgid = tcgetpgrp(STDOUT_FILENO);
1237                 if (tc_pgid != man_pgid) {
1238                         if (tc_pgid == pager_pid) {
1239                                 (void)tcsetpgrp(STDOUT_FILENO, man_pgid);
1240                                 if (signum == SIGTTIN)
1241                                         continue;
1242                         } else
1243                                 outst->tag_files->tcpgid = tc_pgid;
1244                         kill(0, signum);
1245                         continue;
1246                 }
1247
1248                 /* Once in the foreground, activate the pager. */
1249
1250                 if (pager_pid) {
1251                         (void)tcsetpgrp(STDOUT_FILENO, pager_pid);
1252                         kill(pager_pid, SIGCONT);
1253                 } else
1254                         pager_pid = spawn_pager(outst, tag_target);
1255
1256                 /* Wait for the pager to stop or exit. */
1257
1258                 while ((wait_pid = waitpid(pager_pid, &status,
1259                     WUNTRACED)) == -1 && errno == EINTR)
1260                         continue;
1261
1262                 if (wait_pid == -1) {
1263                         mandoc_msg(MANDOCERR_WAIT, 0, 0,
1264                             "%s", strerror(errno));
1265                         break;
1266                 }
1267                 if (!WIFSTOPPED(status))
1268                         break;
1269
1270                 signum = WSTOPSIG(status);
1271         }
1272 }
1273
1274 static pid_t
1275 spawn_pager(struct outstate *outst, char *tag_target)
1276 {
1277         const struct timespec timeout = { 0, 100000000 };  /* 0.1s */
1278 #define MAX_PAGER_ARGS 16
1279         char            *argv[MAX_PAGER_ARGS];
1280         const char      *pager;
1281         char            *cp;
1282 #if HAVE_LESS_T
1283         size_t           cmdlen;
1284 #endif
1285         int              argc, use_ofn;
1286         pid_t            pager_pid;
1287
1288         assert(outst->tag_files->ofd == -1);
1289         assert(outst->tag_files->tfs == NULL);
1290
1291         pager = getenv("MANPAGER");
1292         if (pager == NULL || *pager == '\0')
1293                 pager = getenv("PAGER");
1294         if (pager == NULL || *pager == '\0')
1295                 pager = BINM_PAGER;
1296         cp = mandoc_strdup(pager);
1297
1298         /*
1299          * Parse the pager command into words.
1300          * Intentionally do not do anything fancy here.
1301          */
1302
1303         argc = 0;
1304         while (argc + 5 < MAX_PAGER_ARGS) {
1305                 argv[argc++] = cp;
1306                 cp = strchr(cp, ' ');
1307                 if (cp == NULL)
1308                         break;
1309                 *cp++ = '\0';
1310                 while (*cp == ' ')
1311                         cp++;
1312                 if (*cp == '\0')
1313                         break;
1314         }
1315
1316         /* For less(1), use the tag file. */
1317
1318         use_ofn = 1;
1319 #if HAVE_LESS_T
1320         if (*outst->tag_files->tfn != '\0' &&
1321             (cmdlen = strlen(argv[0])) >= 4) {
1322                 cp = argv[0] + cmdlen - 4;
1323                 if (strcmp(cp, "less") == 0) {
1324                         argv[argc++] = mandoc_strdup("-T");
1325                         argv[argc++] = outst->tag_files->tfn;
1326                         if (tag_target != NULL) {
1327                                 argv[argc++] = mandoc_strdup("-t");
1328                                 argv[argc++] = tag_target;
1329                                 use_ofn = 0;
1330                         }
1331                 }
1332         }
1333 #endif
1334         if (use_ofn) {
1335                 if (outst->outtype == OUTT_HTML && tag_target != NULL)
1336                         mandoc_asprintf(&argv[argc], "file://%s#%s",
1337                             outst->tag_files->ofn, tag_target);
1338                 else
1339                         argv[argc] = outst->tag_files->ofn;
1340                 argc++;
1341         }
1342         argv[argc] = NULL;
1343
1344         switch (pager_pid = fork()) {
1345         case -1:
1346                 mandoc_msg(MANDOCERR_FORK, 0, 0, "%s", strerror(errno));
1347                 exit(mandoc_msg_getrc());
1348         case 0:
1349                 break;
1350         default:
1351                 (void)setpgid(pager_pid, 0);
1352                 (void)tcsetpgrp(STDOUT_FILENO, pager_pid);
1353 #if HAVE_PLEDGE
1354                 if (pledge("stdio rpath tmppath tty proc", NULL) == -1) {
1355                         mandoc_msg(MANDOCERR_PLEDGE, 0, 0,
1356                             "%s", strerror(errno));
1357                         exit(mandoc_msg_getrc());
1358                 }
1359 #endif
1360                 outst->tag_files->pager_pid = pager_pid;
1361                 return pager_pid;
1362         }
1363
1364         /*
1365          * The child process becomes the pager.
1366          * Do not start it before controlling the terminal.
1367          */
1368
1369         while (tcgetpgrp(STDOUT_FILENO) != getpid())
1370                 nanosleep(&timeout, NULL);
1371
1372         execvp(argv[0], argv);
1373         mandoc_msg(MANDOCERR_EXEC, 0, 0, "%s: %s", argv[0], strerror(errno));
1374         _exit(mandoc_msg_getrc());
1375 }