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File: [cvsweb.bsd.lv] / mandoc / main.c (download)

Revision 1.247, Sun Oct 11 21:12:54 2015 UTC (8 years, 5 months ago) by schwarze
Branch: MAIN
Changes since 1.246: +33 -50 lines

Finally use __progname, err(3) and warn(3).
That's more readable and less error-prone than fumbling around
with argv[0], fprintf(3), strerror(3), perror(3), and exit(3).

It's a bad idea to boycott good interfaces merely because standards
committees ignore them.  Instead, let's provide compatibility modules
for archaic systems (like commercial Solaris) that still don't have
them.  The compat module has an UCB Copyright (c) 1993...

/*	$Id: main.c,v 1.247 2015/10/11 21:12:54 schwarze Exp $ */
/*
 * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2010-2012, 2014, 2015 Ingo Schwarze <schwarze@openbsd.org>
 * Copyright (c) 2010 Joerg Sonnenberger <joerg@netbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "config.h"

#include <sys/types.h>
#include <sys/param.h>	/* MACHINE */
#include <sys/wait.h>

#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <glob.h>
#include <signal.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mandoc_aux.h"
#include "mandoc.h"
#include "roff.h"
#include "mdoc.h"
#include "man.h"
#include "tag.h"
#include "main.h"
#include "manconf.h"
#include "mansearch.h"

#if !defined(__GNUC__) || (__GNUC__ < 2)
# if !defined(lint)
#  define __attribute__(x)
# endif
#endif /* !defined(__GNUC__) || (__GNUC__ < 2) */

enum	outmode {
	OUTMODE_DEF = 0,
	OUTMODE_FLN,
	OUTMODE_LST,
	OUTMODE_ALL,
	OUTMODE_INT,
	OUTMODE_ONE
};

typedef	void		(*out_mdoc)(void *, const struct roff_man *);
typedef	void		(*out_man)(void *, const struct roff_man *);
typedef	void		(*out_free)(void *);

enum	outt {
	OUTT_ASCII = 0,	/* -Tascii */
	OUTT_LOCALE,	/* -Tlocale */
	OUTT_UTF8,	/* -Tutf8 */
	OUTT_TREE,	/* -Ttree */
	OUTT_MAN,	/* -Tman */
	OUTT_HTML,	/* -Thtml */
	OUTT_LINT,	/* -Tlint */
	OUTT_PS,	/* -Tps */
	OUTT_PDF	/* -Tpdf */
};

struct	curparse {
	struct mparse	 *mp;
	struct mchars	 *mchars;	/* character table */
	enum mandoclevel  wlevel;	/* ignore messages below this */
	int		  wstop;	/* stop after a file with a warning */
	enum outt	  outtype;	/* which output to use */
	out_mdoc	  outmdoc;	/* mdoc output ptr */
	out_man		  outman;	/* man output ptr */
	out_free	  outfree;	/* free output ptr */
	void		 *outdata;	/* data for output */
	struct manoutput *outopts;	/* output options */
};

static	int		  fs_lookup(const struct manpaths *,
				size_t ipath, const char *,
				const char *, const char *,
				struct manpage **, size_t *);
static	void		  fs_search(const struct mansearch *,
				const struct manpaths *, int, char**,
				struct manpage **, size_t *);
static	int		  koptions(int *, char *);
#if HAVE_SQLITE3
int			  mandocdb(int, char**);
#endif
static	int		  moptions(int *, char *);
static	void		  mmsg(enum mandocerr, enum mandoclevel,
				const char *, int, int, const char *);
static	void		  parse(struct curparse *, int, const char *);
static	void		  passthrough(const char *, int, int);
static	pid_t		  spawn_pager(struct tag_files *);
static	int		  toptions(struct curparse *, char *);
static	void		  usage(enum argmode) __attribute__((noreturn));
static	int		  woptions(struct curparse *, char *);

extern	char		 *__progname;

static	const int sec_prios[] = {1, 4, 5, 8, 6, 3, 7, 2, 9};
static	char		  help_arg[] = "help";
static	char		 *help_argv[] = {help_arg, NULL};
static	enum mandoclevel  rc;


int
main(int argc, char *argv[])
{
	struct manconf	 conf;
	struct curparse	 curp;
	struct mansearch search;
	struct tag_files *tag_files;
	char		*auxpaths;
	char		*defos;
	unsigned char	*uc;
	struct manpage	*res, *resp;
	char		*conf_file, *defpaths;
	size_t		 isec, i, sz;
	int		 prio, best_prio;
	char		 sec;
	enum mandoclevel rctmp;
	enum outmode	 outmode;
	int		 fd;
	int		 show_usage;
	int		 options;
	int		 use_pager;
	int		 c;

#if !HAVE_PROGNAME
	if (argc < 1)
		__progname = mandoc_strdup("mandoc");
	else if ((__progname = strrchr(argv[0], '/')) == NULL)
		__progname = argv[0];
	else
		++__progname;
#endif

#if HAVE_SQLITE3
	if (strcmp(__progname, BINM_MAKEWHATIS) == 0)
		return mandocdb(argc, argv);
#endif

	/* Search options. */

	memset(&conf, 0, sizeof(conf));
	conf_file = defpaths = NULL;
	auxpaths = NULL;

	memset(&search, 0, sizeof(struct mansearch));
	search.outkey = "Nd";

	if (strcmp(__progname, BINM_MAN) == 0)
		search.argmode = ARG_NAME;
	else if (strcmp(__progname, BINM_APROPOS) == 0)
		search.argmode = ARG_EXPR;
	else if (strcmp(__progname, BINM_WHATIS) == 0)
		search.argmode = ARG_WORD;
	else if (strncmp(__progname, "help", 4) == 0)
		search.argmode = ARG_NAME;
	else
		search.argmode = ARG_FILE;

	/* Parser and formatter options. */

	memset(&curp, 0, sizeof(struct curparse));
	curp.outtype = OUTT_LOCALE;
	curp.wlevel  = MANDOCLEVEL_BADARG;
	curp.outopts = &conf.output;
	options = MPARSE_SO | MPARSE_UTF8 | MPARSE_LATIN1;
	defos = NULL;

	use_pager = 1;
	tag_files = NULL;
	show_usage = 0;
	outmode = OUTMODE_DEF;

	while (-1 != (c = getopt(argc, argv,
			"aC:cfhI:iK:klM:m:O:S:s:T:VW:w"))) {
		switch (c) {
		case 'a':
			outmode = OUTMODE_ALL;
			break;
		case 'C':
			conf_file = optarg;
			break;
		case 'c':
			use_pager = 0;
			break;
		case 'f':
			search.argmode = ARG_WORD;
			break;
		case 'h':
			conf.output.synopsisonly = 1;
			use_pager = 0;
			outmode = OUTMODE_ALL;
			break;
		case 'I':
			if (strncmp(optarg, "os=", 3)) {
				warnx("-I %s: Bad argument", optarg);
				return (int)MANDOCLEVEL_BADARG;
			}
			if (defos) {
				warnx("-I %s: Duplicate argument", optarg);
				return (int)MANDOCLEVEL_BADARG;
			}
			defos = mandoc_strdup(optarg + 3);
			break;
		case 'i':
			outmode = OUTMODE_INT;
			break;
		case 'K':
			if ( ! koptions(&options, optarg))
				return (int)MANDOCLEVEL_BADARG;
			break;
		case 'k':
			search.argmode = ARG_EXPR;
			break;
		case 'l':
			search.argmode = ARG_FILE;
			outmode = OUTMODE_ALL;
			break;
		case 'M':
			defpaths = optarg;
			break;
		case 'm':
			auxpaths = optarg;
			break;
		case 'O':
			search.outkey = optarg;
			while (optarg != NULL)
				manconf_output(&conf.output,
				    strsep(&optarg, ","));
			break;
		case 'S':
			search.arch = optarg;
			break;
		case 's':
			search.sec = optarg;
			break;
		case 'T':
			if ( ! toptions(&curp, optarg))
				return (int)MANDOCLEVEL_BADARG;
			break;
		case 'W':
			if ( ! woptions(&curp, optarg))
				return (int)MANDOCLEVEL_BADARG;
			break;
		case 'w':
			outmode = OUTMODE_FLN;
			break;
		default:
			show_usage = 1;
			break;
		}
	}

	if (show_usage)
		usage(search.argmode);

	/* Postprocess options. */

	if (outmode == OUTMODE_DEF) {
		switch (search.argmode) {
		case ARG_FILE:
			outmode = OUTMODE_ALL;
			use_pager = 0;
			break;
		case ARG_NAME:
			outmode = OUTMODE_ONE;
			break;
		default:
			outmode = OUTMODE_LST;
			break;
		}
	}

	if (outmode == OUTMODE_FLN ||
	    outmode == OUTMODE_LST ||
	    !isatty(STDOUT_FILENO))
		use_pager = 0;

	/* Parse arguments. */

	if (argc > 0) {
		argc -= optind;
		argv += optind;
	}
	resp = NULL;

	/*
	 * Quirks for help(1)
	 * and for a man(1) section argument without -s.
	 */

	if (search.argmode == ARG_NAME) {
		if (*__progname == 'h') {
			if (argc == 0) {
				argv = help_argv;
				argc = 1;
			}
		} else if (argc > 1 &&
		    ((uc = (unsigned char *)argv[0]) != NULL) &&
		    ((isdigit(uc[0]) && (uc[1] == '\0' ||
		      (isalpha(uc[1]) && uc[2] == '\0'))) ||
		     (uc[0] == 'n' && uc[1] == '\0'))) {
			search.sec = (char *)uc;
			argv++;
			argc--;
		}
		if (search.arch == NULL)
			search.arch = getenv("MACHINE");
#ifdef MACHINE
		if (search.arch == NULL)
			search.arch = MACHINE;
#endif
	}

	rc = MANDOCLEVEL_OK;

	/* man(1), whatis(1), apropos(1) */

	if (search.argmode != ARG_FILE) {
		if (argc == 0)
			usage(search.argmode);

		if (search.argmode == ARG_NAME &&
		    outmode == OUTMODE_ONE)
			search.firstmatch = 1;

		/* Access the mandoc database. */

		manconf_parse(&conf, conf_file, defpaths, auxpaths);
#if HAVE_SQLITE3
		mansearch_setup(1);
		if ( ! mansearch(&search, &conf.manpath,
		    argc, argv, &res, &sz))
			usage(search.argmode);
#else
		if (search.argmode != ARG_NAME) {
			fputs("mandoc: database support not compiled in\n",
			    stderr);
			return (int)MANDOCLEVEL_BADARG;
		}
		sz = 0;
#endif

		if (sz == 0) {
			if (search.argmode == ARG_NAME)
				fs_search(&search, &conf.manpath,
				    argc, argv, &res, &sz);
			else
				warnx("nothing appropriate");
		}

		if (sz == 0) {
			rc = MANDOCLEVEL_BADARG;
			goto out;
		}

		/*
		 * For standard man(1) and -a output mode,
		 * prepare for copying filename pointers
		 * into the program parameter array.
		 */

		if (outmode == OUTMODE_ONE) {
			argc = 1;
			best_prio = 10;
		} else if (outmode == OUTMODE_ALL)
			argc = (int)sz;

		/* Iterate all matching manuals. */

		resp = res;
		for (i = 0; i < sz; i++) {
			if (outmode == OUTMODE_FLN)
				puts(res[i].file);
			else if (outmode == OUTMODE_LST)
				printf("%s - %s\n", res[i].names,
				    res[i].output == NULL ? "" :
				    res[i].output);
			else if (outmode == OUTMODE_ONE) {
				/* Search for the best section. */
				isec = strcspn(res[i].file, "123456789");
				sec = res[i].file[isec];
				if ('\0' == sec)
					continue;
				prio = sec_prios[sec - '1'];
				if (prio >= best_prio)
					continue;
				best_prio = prio;
				resp = res + i;
			}
		}

		/*
		 * For man(1), -a and -i output mode, fall through
		 * to the main mandoc(1) code iterating files
		 * and running the parsers on each of them.
		 */

		if (outmode == OUTMODE_FLN || outmode == OUTMODE_LST)
			goto out;
	}

	/* mandoc(1) */

	if (search.argmode == ARG_FILE && ! moptions(&options, auxpaths))
		return (int)MANDOCLEVEL_BADARG;

	curp.mchars = mchars_alloc();
	curp.mp = mparse_alloc(options, curp.wlevel, mmsg,
	    curp.mchars, defos);

	/*
	 * Conditionally start up the lookaside buffer before parsing.
	 */
	if (OUTT_MAN == curp.outtype)
		mparse_keep(curp.mp);

	if (argc < 1) {
		if (use_pager)
			tag_files = tag_init();
		parse(&curp, STDIN_FILENO, "<stdin>");
	}

	while (argc > 0) {
		rctmp = mparse_open(curp.mp, &fd,
		    resp != NULL ? resp->file : *argv);
		if (rc < rctmp)
			rc = rctmp;

		if (fd != -1) {
			if (use_pager) {
				tag_files = tag_init();
				use_pager = 0;
			}

			if (resp == NULL)
				parse(&curp, fd, *argv);
			else if (resp->form & FORM_SRC) {
				/* For .so only; ignore failure. */
				chdir(conf.manpath.paths[resp->ipath]);
				parse(&curp, fd, resp->file);
			} else
				passthrough(resp->file, fd,
				    conf.output.synopsisonly);

			if (argc > 1 && curp.outtype <= OUTT_UTF8)
				ascii_sepline(curp.outdata);
		}

		if (MANDOCLEVEL_OK != rc && curp.wstop)
			break;

		if (resp != NULL)
			resp++;
		else
			argv++;
		if (--argc)
			mparse_reset(curp.mp);
	}

	if (curp.outfree)
		(*curp.outfree)(curp.outdata);
	mparse_free(curp.mp);
	mchars_free(curp.mchars);

out:
	if (search.argmode != ARG_FILE) {
		manconf_free(&conf);
#if HAVE_SQLITE3
		mansearch_free(res, sz);
		mansearch_setup(0);
#endif
	}

	free(defos);

	/*
	 * When using a pager, finish writing both temporary files,
	 * fork it, wait for the user to close it, and clean up.
	 */

	if (tag_files != NULL) {
		fclose(stdout);
		tag_write();
		waitpid(spawn_pager(tag_files), NULL, 0);
		tag_unlink();
	}

	return (int)rc;
}

static void
usage(enum argmode argmode)
{

	switch (argmode) {
	case ARG_FILE:
		fputs("usage: mandoc [-acfhkl] [-I os=name] "
		    "[-K encoding] [-mformat] [-O option]\n"
		    "\t      [-T output] [-W level] [file ...]\n", stderr);
		break;
	case ARG_NAME:
		fputs("usage: man [-acfhklw] [-C file] [-I os=name] "
		    "[-K encoding] [-M path] [-m path]\n"
		    "\t   [-O option=value] [-S subsection] [-s section] "
		    "[-T output] [-W level]\n"
		    "\t   [section] name ...\n", stderr);
		break;
	case ARG_WORD:
		fputs("usage: whatis [-acfhklw] [-C file] "
		    "[-M path] [-m path] [-O outkey] [-S arch]\n"
		    "\t      [-s section] name ...\n", stderr);
		break;
	case ARG_EXPR:
		fputs("usage: apropos [-acfhklw] [-C file] "
		    "[-M path] [-m path] [-O outkey] [-S arch]\n"
		    "\t       [-s section] expression ...\n", stderr);
		break;
	}
	exit((int)MANDOCLEVEL_BADARG);
}

static int
fs_lookup(const struct manpaths *paths, size_t ipath,
	const char *sec, const char *arch, const char *name,
	struct manpage **res, size_t *ressz)
{
	glob_t		 globinfo;
	struct manpage	*page;
	char		*file;
	int		 form, globres;

	form = FORM_SRC;
	mandoc_asprintf(&file, "%s/man%s/%s.%s",
	    paths->paths[ipath], sec, name, sec);
	if (access(file, R_OK) != -1)
		goto found;
	free(file);

	mandoc_asprintf(&file, "%s/cat%s/%s.0",
	    paths->paths[ipath], sec, name);
	if (access(file, R_OK) != -1) {
		form = FORM_CAT;
		goto found;
	}
	free(file);

	if (arch != NULL) {
		mandoc_asprintf(&file, "%s/man%s/%s/%s.%s",
		    paths->paths[ipath], sec, arch, name, sec);
		if (access(file, R_OK) != -1)
			goto found;
		free(file);
	}

	mandoc_asprintf(&file, "%s/man%s/%s.[01-9]*",
	    paths->paths[ipath], sec, name);
	globres = glob(file, 0, NULL, &globinfo);
	if (globres != 0 && globres != GLOB_NOMATCH)
		warn("%s: glob", file);
	free(file);
	if (globres == 0)
		file = mandoc_strdup(*globinfo.gl_pathv);
	globfree(&globinfo);
	if (globres != 0)
		return 0;

found:
#if HAVE_SQLITE3
	warnx("outdated mandoc.db lacks %s(%s) entry, run makewhatis %s\n",
	    name, sec, paths->paths[ipath]);
#endif
	*res = mandoc_reallocarray(*res, ++*ressz, sizeof(struct manpage));
	page = *res + (*ressz - 1);
	page->file = file;
	page->names = NULL;
	page->output = NULL;
	page->ipath = ipath;
	page->bits = NAME_FILE & NAME_MASK;
	page->sec = (*sec >= '1' && *sec <= '9') ? *sec - '1' + 1 : 10;
	page->form = form;
	return 1;
}

static void
fs_search(const struct mansearch *cfg, const struct manpaths *paths,
	int argc, char **argv, struct manpage **res, size_t *ressz)
{
	const char *const sections[] =
	    {"1", "8", "6", "2", "3", "3p", "5", "7", "4", "9"};
	const size_t nsec = sizeof(sections)/sizeof(sections[0]);

	size_t		 ipath, isec, lastsz;

	assert(cfg->argmode == ARG_NAME);

	*res = NULL;
	*ressz = lastsz = 0;
	while (argc) {
		for (ipath = 0; ipath < paths->sz; ipath++) {
			if (cfg->sec != NULL) {
				if (fs_lookup(paths, ipath, cfg->sec,
				    cfg->arch, *argv, res, ressz) &&
				    cfg->firstmatch)
					return;
			} else for (isec = 0; isec < nsec; isec++)
				if (fs_lookup(paths, ipath, sections[isec],
				    cfg->arch, *argv, res, ressz) &&
				    cfg->firstmatch)
					return;
		}
		if (*ressz == lastsz)
			warnx("No entry for %s in the manual.", *argv);
		lastsz = *ressz;
		argv++;
		argc--;
	}
}

static void
parse(struct curparse *curp, int fd, const char *file)
{
	enum mandoclevel  rctmp;
	struct roff_man	 *man;

	/* Begin by parsing the file itself. */

	assert(file);
	assert(fd >= -1);

	rctmp = mparse_readfd(curp->mp, fd, file);
	if (rc < rctmp)
		rc = rctmp;

	/*
	 * With -Wstop and warnings or errors of at least the requested
	 * level, do not produce output.
	 */

	if (rctmp != MANDOCLEVEL_OK && curp->wstop)
		return;

	/* If unset, allocate output dev now (if applicable). */

	if ( ! (curp->outman && curp->outmdoc)) {
		switch (curp->outtype) {
		case OUTT_HTML:
			curp->outdata = html_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = html_free;
			break;
		case OUTT_UTF8:
			curp->outdata = utf8_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = ascii_free;
			break;
		case OUTT_LOCALE:
			curp->outdata = locale_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = ascii_free;
			break;
		case OUTT_ASCII:
			curp->outdata = ascii_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = ascii_free;
			break;
		case OUTT_PDF:
			curp->outdata = pdf_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = pspdf_free;
			break;
		case OUTT_PS:
			curp->outdata = ps_alloc(curp->mchars,
			    curp->outopts);
			curp->outfree = pspdf_free;
			break;
		default:
			break;
		}

		switch (curp->outtype) {
		case OUTT_HTML:
			curp->outman = html_man;
			curp->outmdoc = html_mdoc;
			break;
		case OUTT_TREE:
			curp->outman = tree_man;
			curp->outmdoc = tree_mdoc;
			break;
		case OUTT_MAN:
			curp->outmdoc = man_mdoc;
			curp->outman = man_man;
			break;
		case OUTT_PDF:
			/* FALLTHROUGH */
		case OUTT_ASCII:
			/* FALLTHROUGH */
		case OUTT_UTF8:
			/* FALLTHROUGH */
		case OUTT_LOCALE:
			/* FALLTHROUGH */
		case OUTT_PS:
			curp->outman = terminal_man;
			curp->outmdoc = terminal_mdoc;
			break;
		default:
			break;
		}
	}

	mparse_result(curp->mp, &man, NULL);

	/* Execute the out device, if it exists. */

	if (man == NULL)
		return;
	if (curp->outmdoc != NULL && man->macroset == MACROSET_MDOC)
		(*curp->outmdoc)(curp->outdata, man);
	if (curp->outman != NULL && man->macroset == MACROSET_MAN)
		(*curp->outman)(curp->outdata, man);
}

static void
passthrough(const char *file, int fd, int synopsis_only)
{
	const char	 synb[] = "S\bSY\bYN\bNO\bOP\bPS\bSI\bIS\bS";
	const char	 synr[] = "SYNOPSIS";

	FILE		*stream;
	const char	*syscall;
	char		*line;
	size_t		 len, off;
	ssize_t		 nw;
	int		 print;

	fflush(stdout);

	if ((stream = fdopen(fd, "r")) == NULL) {
		close(fd);
		syscall = "fdopen";
		goto fail;
	}

	print = 0;
	while ((line = fgetln(stream, &len)) != NULL) {
		if (synopsis_only) {
			if (print) {
				if ( ! isspace((unsigned char)*line))
					goto done;
				while (len &&
				    isspace((unsigned char)*line)) {
					line++;
					len--;
				}
			} else {
				if ((len == sizeof(synb) &&
				     ! strncmp(line, synb, len - 1)) ||
				    (len == sizeof(synr) &&
				     ! strncmp(line, synr, len - 1)))
					print = 1;
				continue;
			}
		}
		for (off = 0; off < len; off += nw)
			if ((nw = write(STDOUT_FILENO, line + off,
			    len - off)) == -1 || nw == 0) {
				fclose(stream);
				syscall = "write";
				goto fail;
			}
	}

	if (ferror(stream)) {
		fclose(stream);
		syscall = "fgetln";
		goto fail;
	}

done:
	fclose(stream);
	return;

fail:
	warn("%s: SYSERR: %s", file, syscall);
	if (rc < MANDOCLEVEL_SYSERR)
		rc = MANDOCLEVEL_SYSERR;
}

static int
koptions(int *options, char *arg)
{

	if ( ! strcmp(arg, "utf-8")) {
		*options |=  MPARSE_UTF8;
		*options &= ~MPARSE_LATIN1;
	} else if ( ! strcmp(arg, "iso-8859-1")) {
		*options |=  MPARSE_LATIN1;
		*options &= ~MPARSE_UTF8;
	} else if ( ! strcmp(arg, "us-ascii")) {
		*options &= ~(MPARSE_UTF8 | MPARSE_LATIN1);
	} else {
		warnx("-K %s: Bad argument", arg);
		return 0;
	}
	return 1;
}

static int
moptions(int *options, char *arg)
{

	if (arg == NULL)
		/* nothing to do */;
	else if (0 == strcmp(arg, "doc"))
		*options |= MPARSE_MDOC;
	else if (0 == strcmp(arg, "andoc"))
		/* nothing to do */;
	else if (0 == strcmp(arg, "an"))
		*options |= MPARSE_MAN;
	else {
		warnx("-m %s: Bad argument", arg);
		return 0;
	}

	return 1;
}

static int
toptions(struct curparse *curp, char *arg)
{

	if (0 == strcmp(arg, "ascii"))
		curp->outtype = OUTT_ASCII;
	else if (0 == strcmp(arg, "lint")) {
		curp->outtype = OUTT_LINT;
		curp->wlevel  = MANDOCLEVEL_WARNING;
	} else if (0 == strcmp(arg, "tree"))
		curp->outtype = OUTT_TREE;
	else if (0 == strcmp(arg, "man"))
		curp->outtype = OUTT_MAN;
	else if (0 == strcmp(arg, "html"))
		curp->outtype = OUTT_HTML;
	else if (0 == strcmp(arg, "utf8"))
		curp->outtype = OUTT_UTF8;
	else if (0 == strcmp(arg, "locale"))
		curp->outtype = OUTT_LOCALE;
	else if (0 == strcmp(arg, "xhtml"))
		curp->outtype = OUTT_HTML;
	else if (0 == strcmp(arg, "ps"))
		curp->outtype = OUTT_PS;
	else if (0 == strcmp(arg, "pdf"))
		curp->outtype = OUTT_PDF;
	else {
		warnx("-T %s: Bad argument", arg);
		return 0;
	}

	return 1;
}

static int
woptions(struct curparse *curp, char *arg)
{
	char		*v, *o;
	const char	*toks[7];

	toks[0] = "stop";
	toks[1] = "all";
	toks[2] = "warning";
	toks[3] = "error";
	toks[4] = "unsupp";
	toks[5] = "fatal";
	toks[6] = NULL;

	while (*arg) {
		o = arg;
		switch (getsubopt(&arg, UNCONST(toks), &v)) {
		case 0:
			curp->wstop = 1;
			break;
		case 1:
			/* FALLTHROUGH */
		case 2:
			curp->wlevel = MANDOCLEVEL_WARNING;
			break;
		case 3:
			curp->wlevel = MANDOCLEVEL_ERROR;
			break;
		case 4:
			curp->wlevel = MANDOCLEVEL_UNSUPP;
			break;
		case 5:
			curp->wlevel = MANDOCLEVEL_BADARG;
			break;
		default:
			warnx("-W %s: Bad argument", o);
			return 0;
		}
	}

	return 1;
}

static void
mmsg(enum mandocerr t, enum mandoclevel lvl,
		const char *file, int line, int col, const char *msg)
{
	const char	*mparse_msg;

	fprintf(stderr, "%s: %s:", __progname, file);

	if (line)
		fprintf(stderr, "%d:%d:", line, col + 1);

	fprintf(stderr, " %s", mparse_strlevel(lvl));

	if (NULL != (mparse_msg = mparse_strerror(t)))
		fprintf(stderr, ": %s", mparse_msg);

	if (msg)
		fprintf(stderr, ": %s", msg);

	fputc('\n', stderr);
}

static pid_t
spawn_pager(struct tag_files *tag_files)
{
#define MAX_PAGER_ARGS 16
	char		*argv[MAX_PAGER_ARGS];
	const char	*pager;
	char		*cp;
	size_t		 cmdlen;
	int		 argc;
	pid_t		 pager_pid;

	pager = getenv("MANPAGER");
	if (pager == NULL || *pager == '\0')
		pager = getenv("PAGER");
	if (pager == NULL || *pager == '\0')
		pager = "more -s";
	cp = mandoc_strdup(pager);

	/*
	 * Parse the pager command into words.
	 * Intentionally do not do anything fancy here.
	 */

	argc = 0;
	while (argc + 4 < MAX_PAGER_ARGS) {
		argv[argc++] = cp;
		cp = strchr(cp, ' ');
		if (cp == NULL)
			break;
		*cp++ = '\0';
		while (*cp == ' ')
			cp++;
		if (*cp == '\0')
			break;
	}

	/* For more(1) and less(1), use the tag file. */

	if ((cmdlen = strlen(argv[0])) >= 4) {
		cp = argv[0] + cmdlen - 4;
		if (strcmp(cp, "less") == 0 || strcmp(cp, "more") == 0) {
			argv[argc++] = mandoc_strdup("-T");
			argv[argc++] = tag_files->tfn;
		}
	}
	argv[argc++] = tag_files->ofn;
	argv[argc] = NULL;

	switch (pager_pid = fork()) {
	case -1:
		err((int)MANDOCLEVEL_SYSERR, "fork");
	case 0:
		break;
	default:
		return pager_pid;
	}

	/* The child process becomes the pager. */

	if (dup2(tag_files->ofd, STDOUT_FILENO) == -1)
		err((int)MANDOCLEVEL_SYSERR, "pager stdout");
	close(tag_files->ofd);
	close(tag_files->tfd);
	execvp(argv[0], argv);
	err((int)MANDOCLEVEL_SYSERR, "exec %s", argv[0]);
}