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File: [cvsweb.bsd.lv] / texi2mdoc / main.c (download)

Revision 1.29, Sat Feb 21 22:01:32 2015 UTC (9 years, 1 month ago) by kristaps
Branch: MAIN
Changes since 1.28: +3 -1 lines

Protect against too many nested values.
Convert texiabort() (needs an errno) to texierr().

/*	$Id: main.c,v 1.29 2015/02/21 22:01:32 kristaps Exp $ */
/*
 * Copyright (c) 2015 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * 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 AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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 <sys/mman.h>
#include <sys/stat.h>

#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <getopt.h>
#include <libgen.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "extern.h"

#define	SECTSZ 4
static	const char *const sects[SECTSZ] = {
	"Sh",
	"Ss",
	"Em",
	"No",
};

static	void doaccent(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doblock(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dobracket(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dobye(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dodefindex(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dodefn(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dodisplay(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doenumerate(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doexample(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doignargn(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doignblock(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doignbracket(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doignline(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doinline(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doinclude(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doitem(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doitemize(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dolink(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void domath(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void domultitable(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doquotation(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dotable(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dotop(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosecoffs(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosection(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosp(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosubsection(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosubsubsection(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dosymbol(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dotab(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dotitle(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void dovalue(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doverb(struct texi *, enum texicmd, const char *, size_t, size_t *);
static	void doverbinclude(struct texi *, enum texicmd, const char *, size_t, size_t *);

static	const struct texitok __texitoks[TEXICMD__MAX] = {
	/* TEXICMD__BEGIN */
	{ doignargn, "acronym", 7 }, /* TEXICMD_ACRONYM */
	{ doaccent, "'", 1 }, /* TEXICMD_ACUTE */
	{ doignline, "afourpaper", 10 }, /* TEXICMD_A4PAPER */
	{ doignbracket, "anchor", 6 }, /* TEXICMD_ANCHOR */
	{ dosection, "appendix", 8 }, /* TEXICMD_APPENDIX */
	{ dosection, "appendixsec", 11 }, /* TEXICMD_APPENDIXSEC */
	{ dosubsection, "appendixsubsec", 14 }, /* TEXICMD_APPENDIXSUBSEC */
	{ dosubsubsection, "appendixsubsubsec", 17 }, /* TEXICMD_APPENDIXSUBSUBSEC */
	{ doinline, "asis", 4 }, /* TEXICMD_ASIS */
	{ dosymbol, "*", 1 }, /* TEXICMD_ASTERISK */
	{ dosymbol, "@", 1 }, /* TEXICMD_AT */
	{ doignline, "author", 6 }, /* TEXICMD_AUTHOR */
	{ doinline, "b", 1 }, /* TEXICMD_BOLD */
	{ dosymbol, "!", 1 }, /* TEXICMD_BANG */
	{ dosymbol, "bullet", 6 }, /* TEXICMD_BULLET */
	{ dobye, "bye", 3 }, /* TEXICMD_BYE */
	{ doignline, "center", 6 }, /* TEXICMD_CENTER */
	{ dosection, "chapter", 7 }, /* TEXICMD_CHAPTER */
	{ doignline, "cindex", 6 }, /* TEXICMD_CINDEX */
	{ doaccent, "^", 1 }, /* TEXICMD_CIRCUMFLEX */
	{ doinline, "cite", 4 }, /* TEXICMD_CITE */
	{ dovalue, "clear", 5 }, /* TEXICMD_CLEAR */
	{ doinline, "code", 4 }, /* TEXICMD_CODE */
	{ dosymbol, ":", 1 }, /* TEXICMD_COLON */
	{ NULL, "columnfractions", 15 }, /* TEXICMD_COLUMNFRACTIONS */
	{ doinline, "command", 7 }, /* TEXICMD_COMMAND */
	{ doignline, "c", 1 }, /* TEXICMD_COMMENT */
	{ doignline, "comment", 7 }, /* TEXICMD_COMMENT_LONG */
	{ doignline, "contents", 8 }, /* TEXICMD_CONTENTS */
	{ doignblock, "copying", 7 }, /* TEXICMD_COPYING */
	{ dosymbol, "copyright", 9 }, /* TEXICMD_COPYRIGHT */
	{ dodefindex, "defcodeindex", 12 }, /* TEXICMD_DEFCODEINDEX */
	{ dodefn, "deffn", 5 }, /* TEXICMD_DEFFN */
	{ dodefn, "deffnx", 6 }, /* TEXICMD_DEFFNX */
	{ dodefindex, "defindex", 8 }, /* TEXICMD_DEFINDEX */
	{ dodefn, "defmac", 6 }, /* TEXICMD_DEFMAC */
	{ dodefn, "defmacx", 7 }, /* TEXICMD_DEFMACX */
	{ dodefn, "deftp", 5 }, /* TEXICMD_DEFTP */
	{ dodefn, "deftpx", 6 }, /* TEXICMD_DEFTPX */
	{ dodefn, "deftypefn", 9 }, /* TEXICMD_DEFTYPEFN */
	{ dodefn, "deftypefnx", 10 }, /* TEXICMD_DEFTYPEFNX */
	{ dodefn, "deftypefun", 10 }, /* TEXICMD_DEFTYPEFUN */
	{ dodefn, "deftypefunx", 11 }, /* TEXICMD_DEFTYPEFUNX */
	{ dodefn, "deftypevar", 10 }, /* TEXICMD_DEFTYPEVAR */
	{ dodefn, "deftypevarx", 11 }, /* TEXICMD_DEFTYPEVARX */
	{ dodefn, "deftypevr", 9 }, /* TEXICMD_DEFTYPEVR */
	{ dodefn, "deftypevrx", 10 }, /* TEXICMD_DEFTYPEVRX */
	{ dodefn, "defun", 5 }, /* TEXICMD_DEFUN */
	{ dodefn, "defunx", 6 }, /* TEXICMD_DEFUNX */
	{ dodefn, "defvar", 6 }, /* TEXICMD_DEFVAR */
	{ dodefn, "defvarx", 7 }, /* TEXICMD_DEFVARX */
	{ dodefn, "defvr", 5 }, /* TEXICMD_DEFVR */
	{ dodefn, "defvrx", 6 }, /* TEXICMD_DEFVRX */
	{ doignblock, "detailmenu", 10 }, /* TEXICMD_DETAILMENU */
	{ doinline, "dfn", 3 }, /* TEXICMD_DFN */
	{ doignline, "dircategory", 11 }, /* TEXICMD_DIRCATEGORY */
	{ doignblock, "direntry", 8 }, /* TEXICMD_DIRENTRY */
	{ dodisplay, "display", 7 }, /* TEXICMD_DISPLAY */
	{ doignbracket, "dmn", 3 }, /* TEXICMD_DMN */
	{ dosymbol, "dots", 4 }, /* TEXICMD_DOTS */
	{ dolink, "email", 5 }, /* TEXICMD_EMAIL */
	{ doinline, "emph", 4 }, /* TEXICMD_EMPH */
	{ NULL, "end", 3 }, /* TEXICMD_END */
	{ doenumerate, "enumerate", 9 }, /* TEXICMD_ENUMERATE */
	{ doinline, "env", 3 }, /* TEXICMD_ENV */
	{ dosymbol, "equiv", 5 }, /* TEXICMD_EQUIV */
	{ dosymbol, "error", 5 }, /* TEXICMD_ERROR */
	{ doexample, "example", 7 }, /* TEXICMD_EXAMPLE */
	{ doignline, "exdent", 6 }, /* TEXICMD_EXDENT */
	{ dosymbol, "expansion", 9 }, /* TEXICMD_EXPANSION */
	{ doinline, "file", 4 }, /* TEXICMD_FILE */
	{ doignline, "finalout", 8 }, /* TEXICMD_FINALOUT */
	{ doignline, "findex", 6 }, /* TEXICMD_FINDEX */
	{ dotable, "ftable", 6 }, /* TEXICMD_FTABLE */
	{ dodisplay, "format", 6 }, /* TEXICMD_FORMAT */
	{ doaccent, "`", 1 }, /* TEXICMD_GRAVE */
	{ doblock, "group", 5 }, /* TEXICMD_GROUP */
	{ dosection, "heading", 7 }, /* TEXICMD_HEADING */
	{ doignline, "headings", 8 }, /* TEXICMD_HEADINGS */
	{ doitem, "headitem", 8 }, /* TEXICMD_HEADITEM */
	{ doignblock, "html", 4 }, /* TEXICMD_HTML */
	{ dosymbol, "-", 1 }, /* TEXICMD_HYPHEN */
	{ doinline, "i", 1 }, /* TEXICMD_I */
	{ dovalue, "ifclear", 7 }, /* TEXICMD_IFCLEAR */
	{ doignblock, "ifdocbook", 9 }, /* TEXICMD_IFDOCBOOK */
	{ doignblock, "ifhtml", 6 }, /* TEXICMD_IFHTML */
	{ doblock, "ifinfo", 6 }, /* TEXICMD_IFINFO */
	{ doblock, "ifnotdocbook", 12 }, /* TEXICMD_IFNOTDOCBOOK */
	{ doblock, "ifnothtml", 9 }, /* TEXICMD_IFNOTHTML */
	{ doblock, "ifnotinfo", 9 }, /* TEXICMD_IFNOTINFO */
	{ doignblock, "ifnotplaintext", 14 }, /* TEXICMD_IFNOTPLAINTEXT */
	{ doblock, "ifnottex", 8 }, /* TEXICMD_IFNOTTEX */
	{ doblock, "ifnotxml", 8 }, /* TEXICMD_IFNOTXML */
	{ doblock, "ifplaintext", 11 }, /* TEXICMD_IFPLAINTEXT */
	{ doignblock, "iftex", 5 }, /* TEXICMD_IFTEX */
	{ doignblock, "ifset", 5 }, /* TEXICMD_IFSET */
	{ doignblock, "ifxml", 5 }, /* TEXICMD_IFXML */
	{ doignblock, "ignore", 6 }, /* TEXICMD_IGNORE */
	{ doignbracket, "image", 5 }, /* TEXICMD_IMAGE */
	{ doinclude, "include", 7 }, /* TEXICMD_INCLUDE */
	{ dodisplay, "indentblock", 11 }, /* TEXICMD_INDENTBLOCK */
	{ doignline, "", 0 }, /* TEXICMD_INDEX */
	{ doignline, "insertcopying", 13 }, /* TEXICMD_INSERTCOPYING */
	{ doitem, "item", 4 }, /* TEXICMD_ITEM */
	{ doitemize, "itemize", 7 }, /* TEXICMD_ITEMIZE */
	{ doitem, "itemx", 5 }, /* TEXICMD_ITEMX */
	{ doinline, "kbd", 3 }, /* TEXICMD_KBD */
	{ dobracket, "key", 3 }, /* TEXICMD_KEY */
	{ doignline, "kindex", 6 }, /* TEXICMD_KINDEX */
	{ dosymbol, "LaTeX", 5 }, /* TEXICMD_LATEX */
	{ dosecoffs, "lowersections", 13 }, /* TEXICMD_LOWERSECTIONS */
	{ domath, "math", 4 }, /* TEXICMD_MATH */
	{ doignblock, "menu", 4 }, /* TEXICMD_MENU */
	{ dosymbol, "minus", 5 }, /* TEXICMD_MINUS */
	{ domultitable, "multitable", 10 }, /* TEXICMD_MULTITABLE */
	{ doignline, "need", 4 }, /* TEXICMD_NEED */
	{ dosymbol, "\n", 1 }, /* TEXICMD_NEWLINE */
	{ doignline, "node", 4 }, /* TEXICMD_NODE */
	{ doignline, "noindent", 8 }, /* TEXICMD_NOINDENT */
	{ doinline, "option", 6 }, /* TEXICMD_OPTION */
	{ dolink, "pxref", 5 }, /* TEXICMD_PXREF */
	{ dosymbol, "?", 1 }, /* TEXICMD_QUESTIONMARK */
	{ doquotation, "quotation", 9 }, /* TEXICMD_QUOTATION */
	{ doignline, "page", 4 }, /* TEXICMD_PAGE */
	{ doignline, "paragraphindent", 15 }, /* TEXICMD_PARINDENT */
	{ dosymbol, ".", 1 }, /* TEXICMD_PERIOD */
	{ doignline, "pindex", 6 }, /* TEXICMD_PINDEX */
	{ doignline, "printindex", 10 }, /* TEXICMD_PRINTINDEX */
	{ doinline, "r", 1 }, /* TEXICMD_R */
	{ dosecoffs, "raisesections", 13 }, /* TEXICMD_RAISESECTIONS */
	{ dobracket, "ref", 3 }, /* TEXICMD_REF */
	{ doignline, "refill", 6 }, /* TEXICMD_REFILL */
	{ dosymbol, "result", 6 }, /* TEXICMD_RESULT */
	{ doinline, "samp", 4 }, /* TEXICMD_SAMP */
	{ doinline, "sansserif", 9 }, /* TEXICMD_SANSSERIF */
	{ dobracket, "sc", 2 }, /* TEXICMD_SC */
	{ dosection, "section", 7 }, /* TEXICMD_SECTION */
	{ dovalue, "set", 3 }, /* TEXICMD_SET */
	{ doignline, "setchapternewpage", 17 }, /* TEXICMD_SETCHAPNEWPAGE */
	{ doignline, "setfilename", 11 }, /* TEXICMD_SETFILENAME */
	{ dotitle, "settitle", 8 }, /* TEXICMD_SETTITLE */
	{ doignline, "shortcontents", 13 }, /* TEXICMD_SHORTCONTENTS */
	{ doinline, "slanted", 7 }, /* TEXICMD_SLANTED */
	{ dosp, "sp", 2 }, /* TEXICMD_SP */
	{ dosymbol, " ", 1 }, /* TEXICMD_SPACE */
	{ doignline, "smallbook", 9 }, /* TEXICMD_SMALLBOOK */
	{ dodisplay, "smalldisplay", 12 }, /* TEXICMD_SMALLDISPLAY */
	{ doexample, "smallexample", 12 }, /* TEXICMD_SMALLEXAMPLE */
	{ dodisplay, "smallformat", 11 }, /* TEXICMD_SMALLFORMAT */
	{ dodisplay, "smallindentblock", 16 }, /* TEXICMD_SMALLINDENTBLOCK */
	{ dosymbol, "{", 1 }, /* TEXICMD_SQUIGGLE_LEFT */
	{ dosymbol, "}", 1 }, /* TEXICMD_SQUIGGLE_RIGHT */
	{ doinline, "strong", 6 }, /* TEXICMD_STRONG */
	{ dosubsection, "subheading", 10 }, /* TEXICMD_SUBHEADING */
	{ dosubsection, "subsection", 10 }, /* TEXICMD_SUBSECTION */
	{ dosubsubsection, "subsubheading", 13 }, /* TEXICMD_SUBSUBHEADING */
	{ dosubsubsection, "subsubsection", 13 }, /* TEXICMD_SUBSUBSECTION */
	{ doignline, "subtitle", 8 }, /* TEXICMD_SUBTITLE */
	{ doignline, "summarycontents", 15 }, /* TEXICMD_SUMMARYCONTENTS */
	{ doignline, "synindex", 8 }, /* TEXICMD_SYNINDEX */
	{ doignline, "syncodeindex", 12 }, /* TEXICMD_SYNCODEINDEX */
	{ doinline, "t", 1 }, /* TEXICMD_T */
	{ dotab, "tab", 3 }, /* TEXICMD_TAB */
	{ dosymbol, "\t", 1 }, /* TEXICMD_TABSYM */
	{ dotable, "table", 5 }, /* TEXICMD_TABLE */
	{ doignblock, "tex", 3 }, /* TEXICMD_TEX */
	{ dosymbol, "TeX", 3 }, /* TEXICMD_TEXSYM */
	{ doaccent, "~", 1 }, /* TEXICMD_TILDE */
	{ doignline, "tindex", 6 }, /* TEXICMD_TINDEX */
	{ doignline, "title", 5 }, /* TEXICMD_TITLE */
	{ dobracket, "titlefont", 9 }, /* TEXICMD_TITLEFONT */
	{ doignblock, "titlepage", 9 }, /* TEXICMD_TITLEPAGE */
	{ dotop, "top", 3 }, /* TEXICMD_TOP */
	{ doaccent, "\"", 1 }, /* TEXICMD_UMLAUT */
	{ dosection, "unnumbered", 10 }, /* TEXICMD_UNNUMBERED */
	{ dosection, "unnumberedsec", 13 }, /* TEXICMD_UNNUMBEREDSEC */
	{ dosubsection, "unnumberedsubsec", 16 }, /* TEXICMD_UNNUMBEREDSUBSEC */
	{ dosubsubsection, "unnumberedsubsubsec", 19 }, /* TEXICMD_UNNUMBEREDSUBSUBSEC */
	{ dolink, "uref", 4 }, /* TEXICMD_UREF */
	{ dolink, "url", 3 }, /* TEXICMD_URL */
	{ dovalue, "value", 5 }, /* TEXICMD_VALUE */
	{ doinline, "var", 3 }, /* TEXICMD_VAR */
	{ doverb, "verbatim", 8 }, /* TEXICMD_VERBATIM */
	{ doverbinclude, "verbatiminclude", 15 }, /* TEXICMD_VERBATIMINCLUDE */
	{ doignline, "vindex", 6 }, /* TEXICMD_VINDEX */
	{ dosp, "vskip", 5 }, /* TEXICMD_VSKIP */
	{ dotable, "vtable", 6 }, /* TEXICMD_VTABLE */
	{ dobracket, "w", 1 }, /* TEXICMD_W */
	{ dolink, "xref", 4 }, /* TEXICMD_XREF */
	/* TEXICMD__END */
};

const	struct texitok *const texitoks = __texitoks;

static void
dodefindex(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	size_t	 start, end;
	char	*cp;

	while (*pos < sz && isws(buf[*pos]))
		advance(p, buf, pos);

	start = end = *pos;
	while (end < sz && ! ismspace(buf[end]))
		end++;

	if (start == end) {
		advanceeoln(p, buf, sz, pos, 1);
		return;
	} else if (NULL == (cp = malloc(end - start + 1)))
		texiabort(p, NULL);

	memcpy(cp, &buf[start], end - start);
	cp[end - start] = '\0';

	p->indexs = realloc(p->indexs, 
		sizeof(char *) * (p->indexsz + 1));

	if (NULL == p->indexs)
		texiabort(p, NULL);
	p->indexs[p->indexsz++] = cp;
}

static void
dodefn(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	const char	*blk;

	blk = NULL;
	switch (cmd) {
	case (TEXICMD_DEFFN):
	case (TEXICMD_DEFTP):
	case (TEXICMD_DEFTYPEFN):
	case (TEXICMD_DEFTYPEFUN):
	case (TEXICMD_DEFTYPEVAR):
	case (TEXICMD_DEFTYPEVR):
	case (TEXICMD_DEFUN):
	case (TEXICMD_DEFVAR):
	case (TEXICMD_DEFVR):
		blk = texitoks[cmd].tok;
		break;
	default:
		break;
	}

	if (p->ign) {
		NULL != blk ?
			parseto(p, buf, sz, pos, blk) :
			parseeoln(p, buf, sz, pos);
		return;
	}

	if (NULL != blk)
		texivspace(p);

	switch (cmd) {
	case (TEXICMD_DEFMAC):
	case (TEXICMD_DEFMACX):
		texiputchars(p, "Macro");
		break;
	case (TEXICMD_DEFTYPEVAR):
	case (TEXICMD_DEFTYPEVARX):
	case (TEXICMD_DEFVAR):
	case (TEXICMD_DEFVARX):
		texiputchars(p, "Variable");
		break;
	case (TEXICMD_DEFTYPEFUN):
	case (TEXICMD_DEFTYPEFUNX):
	case (TEXICMD_DEFUN):
	case (TEXICMD_DEFUNX):
		texiputchars(p, "Function");
		break;
	default:
		parselinearg(p, buf, sz, pos);
		break;
	}

	texiputchars(p, ":\n");

	switch (cmd) {
	case (TEXICMD_DEFMAC):
	case (TEXICMD_DEFMACX):
		teximacroopen(p, "Dv");
		while (parselinearg(p, buf, sz, pos)) 
			/* Spin. */ ;
		teximacroclose(p);
		break;
	case (TEXICMD_DEFFN):
	case (TEXICMD_DEFFNX):
	case (TEXICMD_DEFUN):
	case (TEXICMD_DEFUNX):
		teximacroopen(p, "Fo");
		parselinearg(p, buf, sz, pos);
		teximacroclose(p);
		teximacroopen(p, "Fa");
		while (parselinearg(p, buf, sz, pos)) 
			/* Spin. */ ;
		teximacroclose(p);
		teximacro(p, "Fc");
		break;
	case (TEXICMD_DEFTYPEFUN):
	case (TEXICMD_DEFTYPEFUNX):
	case (TEXICMD_DEFTYPEFN):
	case (TEXICMD_DEFTYPEFNX):
		teximacroopen(p, "Ft");
		parselinearg(p, buf, sz, pos);
		teximacroclose(p);
		teximacroopen(p, "Fo");
		parselinearg(p, buf, sz, pos);
		teximacroclose(p);
		teximacroopen(p, "Fa");
		while (parselinearg(p, buf, sz, pos)) 
			/* Spin. */ ;
		teximacroclose(p);
		teximacro(p, "Fc");
		break;
	case (TEXICMD_DEFTP):
	case (TEXICMD_DEFTPX):
	case (TEXICMD_DEFTYPEVAR):
	case (TEXICMD_DEFTYPEVARX):
	case (TEXICMD_DEFTYPEVR):
	case (TEXICMD_DEFTYPEVRX):
		teximacroopen(p, "Vt");
		while (parselinearg(p, buf, sz, pos)) 
			/* Spin. */ ;
		teximacroclose(p);
		break;
	case (TEXICMD_DEFVAR):
	case (TEXICMD_DEFVARX):
	case (TEXICMD_DEFVR):
	case (TEXICMD_DEFVRX):
		teximacroopen(p, "Va");
		while (parselinearg(p, buf, sz, pos)) 
			/* Spin. */ ;
		teximacroclose(p);
		break;
	default:
		abort();
	}

	texivspace(p);
	if (NULL != blk)
		parseto(p, buf, sz, pos, blk);
}

static void
doignblock(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	char		 end[32];
	const char	*term;
	size_t		 endsz, endpos;

	/* 
	 * We want to completely ignore everything in these blocks, so
	 * simply jump to the @end block.
	 */
	endsz = snprintf(end, sizeof(end), 
		"\n@end %s\n", texitoks[cmd].tok);
	assert(endsz < sizeof(end));

	/* 
	 * Look up where our end token occurs.
	 * Set our end position based on the relative offset of that
	 * from our current position, or the EOF if we don't have a
	 * proper ending point.
	 */
	term = memmem(&buf[*pos], sz, end, endsz);
	endpos = NULL == term ? sz :
		*pos + term - &buf[*pos];
	assert(endpos <= sz);
	while (*pos < endpos)
		advance(p, buf, pos);

	/* Only do this if we're not already at the end. */
	if (endpos < sz)
		advanceto(p, buf, pos, endpos + endsz);
}

static void
doblock(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	
	parseto(p, buf, sz, pos, texitoks[cmd].tok);
}

static void
doinline(struct texi *p, enum texicmd cmd,
	const char *buf, size_t sz, size_t *pos)
{
	const char	*macro = NULL;

	switch (cmd) {
	case (TEXICMD_CODE):
	case (TEXICMD_KBD):
	case (TEXICMD_SAMP):
	case (TEXICMD_T):
		macro = "Li";
		break;
	case (TEXICMD_CITE):
	case (TEXICMD_DFN):
	case (TEXICMD_EMPH):
	case (TEXICMD_I):
	case (TEXICMD_SLANTED):
		macro = "Em";
		break;
	case (TEXICMD_B):
	case (TEXICMD_STRONG):
		macro = "Sy";
		break;
	case (TEXICMD_COMMAND):
		macro = "Xr";
		break;
	case (TEXICMD_ENV):
		macro = "Ev";
		break;
	case (TEXICMD_FILE):
		macro = "Pa";
		break;
	case (TEXICMD_OPTION):
		macro = "Op";
		break;
	case (TEXICMD_VAR):
		macro = "Va";
		break;
	default:
		break;
	}

	if (NULL == macro || p->literal || TEXILIST_TABLE == p->list) {
		parsebracket(p, buf, sz, pos);
		return;
	}

	teximacroopen(p, macro);
	p->seenws = 0;
	parsebracket(p, buf, sz, pos);
	texipunctuate(p, buf, sz, pos);
	teximacroclose(p);
}

static void
doverb(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	const char	*end, *term;
	size_t		 endsz, endpos;

	advanceeoln(p, buf, sz, pos, 1);

	/* We end at exactly this token. */
	end = "\n@end verbatim\n";
	endsz = strlen(end);

	/* 
	 * Look up where our end token occurs.
	 * Set our end position based on the relative offset of that
	 * from our current position.
	 */
	term = memmem(&buf[*pos], sz, end, endsz);
	endpos = NULL == term ? sz :
		*pos + term - &buf[*pos];

	teximacro(p, "Bd -literal -offset indent");
	assert(endpos <= sz);
	while (*pos < endpos) {
		if (buf[*pos] == '\n')
			p->outcol = 0;
		else
			p->outcol++;
		if (*pos > 0 && '.' == buf[*pos])
			if ('\n' == buf[*pos - 1])
				fputs("\\&", stdout);
		putchar(buf[*pos]);
		if ('\\' == buf[*pos])
			putchar('e');
		advance(p, buf, pos);
	}
	teximacro(p, "Ed");
	advanceto(p, buf, pos, endpos + endsz);
}

static void
doverbinclude(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	char	 	 fname[PATH_MAX], path[PATH_MAX];
	int	 	 rc;
	size_t	 	 i, end;
	const char	*v;
	enum texicmd	 type;

	while (*pos < sz && ' ' == buf[*pos])
		advance(p, buf, pos);

	for (i = 0; *pos < sz && '\n' != buf[*pos]; ) {
		if (i == sizeof(fname) - 1)
			break;
		if ('@' != buf[*pos]) {
			fname[i++] = buf[*pos];
			advance(p, buf, pos);
			continue;
		}
		type = texicmd(p, buf, *pos, sz, &end);
		advanceto(p, buf, pos, end);
		if (TEXICMD_VALUE != type) 
			texierr(p, "unknown verbatiminclude command");
		v = valueblookup(p, buf, sz, pos);
		if (NULL == v)
			continue;
		while ('\0' != *v) {
			if (i == sizeof(fname) - 1)
				break;
			fname[i++] = *v++;
		}
		if ('\0' != *v)
			break;
	}

	if (i == 0)
		texierr(p, "path too short");
	else if ('\n' != buf[*pos])
		texierr(p, "path too long");
	else if ('/' == fname[0])
		texierr(p, "no absolute paths");
	fname[i] = '\0';

	if (strstr(fname, "../") || strstr(fname, "/.."))
		texierr(p, "insecure path");

	rc = snprintf(path, sizeof(path), 
		"%s/%s", p->dirs[0], fname);
	if (rc < 0) 
		texierr(p, "couldn't format path");
	else if ((size_t)rc >= sizeof(path))
		texierr(p, "path too long");

	parsefile(p, path, 0);
}

static void
doinclude(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	char	 	 fname[PATH_MAX], path[PATH_MAX];
	size_t	 	 i, end;
	int	 	 rc;
	const char	*v;
	enum texicmd	 type;

	while (*pos < sz && ' ' == buf[*pos])
		advance(p, buf, pos);

	/* Read in the filename. */
	for (i = 0; *pos < sz && '\n' != buf[*pos]; ) {
		if (i == sizeof(fname) - 1)
			break;
		if ('@' != buf[*pos]) {
			fname[i++] = buf[*pos];
			advance(p, buf, pos);
			continue;
		}
		type = texicmd(p, buf, *pos, sz, &end);
		advanceto(p, buf, pos, end);
		if (TEXICMD_VALUE != type) 
			texierr(p, "unknown include command");
		v = valueblookup(p, buf, sz, pos);
		if (NULL == v)
			continue;
		while ('\0' != *v) {
			if (i == sizeof(fname) - 1)
				break;
			fname[i++] = *v++;
		}
		if ('\0' != *v)
			break;
	}

	if (i == 0)
		texierr(p, "path too short");
	else if ('\n' != buf[*pos])
		texierr(p, "path too long");
	else if ('/' == fname[0])
		texierr(p, "no absolute paths");
	fname[i] = '\0';

	if (strstr(fname, "../") || strstr(fname, "/.."))
		texierr(p, "insecure path");

	for (i = 0; i < p->dirsz; i++) {
		rc = snprintf(path, sizeof(path), 
			"%s/%s", p->dirs[i], fname);
		if (rc < 0) 
			texierr(p, "couldn't format path");
		else if ((size_t)rc >= sizeof(path))
			texierr(p, "path too long");
		else if (-1 == access(path, R_OK))
			continue;

		parsefile(p, path, 1);
		return;
	}

	texierr(p, "couldn't find %s in includes", fname);
}

static void
dobracket(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	parsebracket(p, buf, sz, pos);
}

static void
dodisplay(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	switch (cmd) {
	case (TEXICMD_FORMAT):
	case (TEXICMD_SMALLFORMAT):
		teximacro(p, "Bd -filled");
		break;
	default:
		teximacro(p, "Bd -filled -offset indent");
		break;
	}

	p->seenvs = 1;
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
	parseto(p, buf, sz, pos, texitoks[cmd].tok);
	teximacro(p, "Ed");
}

static void
doexample(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	teximacro(p, "Bd -literal -offset indent");
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
	p->literal++;
	parseto(p, buf, sz, pos, texitoks[cmd].tok);
	p->literal--;
	teximacro(p, "Ed");
}

static void
dobye(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	texiexit(p);
	exit(EXIT_SUCCESS);
}

static void
dotitle(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	size_t	 start, end;

	while (*pos < sz && isws(buf[*pos]))
		advance(p, buf, pos);
	start = end = *pos;
	while (end < sz && '\n' != buf[end])
		end++;
	advanceeoln(p, buf, sz, pos, 1);
	free(p->subtitle);
	p->subtitle = malloc(end - start + 1);
	if (NULL == p->subtitle)
		texiabort(p, NULL);
	memcpy(p->subtitle, &buf[start], end - start);
	p->subtitle[end - start] = '\0';
}

static void
doaccent(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	if (*pos == sz)
		return;
	advance(p, buf, pos);
	switch (cmd) {
	case (TEXICMD_ACUTE):
		switch (buf[*pos]) {
		case ('a'): case ('A'):
		case ('e'): case ('E'):
		case ('i'): case ('I'):
		case ('o'): case ('O'):
		case ('u'): case ('U'):
			texiputchars(p, "\\(\'");
			texiputchar(p, buf[*pos]);
			break;
		default:
			texiputchar(p, buf[*pos]);
		}
		break;
	case (TEXICMD_CIRCUMFLEX):
		switch (buf[*pos]) {
		case ('a'): case ('A'):
		case ('e'): case ('E'):
		case ('i'): case ('I'):
		case ('o'): case ('O'):
		case ('u'): case ('U'):
			texiputchars(p, "\\(^");
			texiputchar(p, buf[*pos]);
			break;
		default:
			texiputchar(p, buf[*pos]);
		}
		break;
	case (TEXICMD_GRAVE):
		switch (buf[*pos]) {
		case ('a'): case ('A'):
		case ('e'): case ('E'):
		case ('i'): case ('I'):
		case ('o'): case ('O'):
		case ('u'): case ('U'):
			texiputchars(p, "\\(`");
			texiputchar(p, buf[*pos]);
			break;
		default:
			texiputchar(p, buf[*pos]);
		}
		break;
	case (TEXICMD_TILDE):
		switch (buf[*pos]) {
		case ('a'): case ('A'):
		case ('n'): case ('N'):
		case ('o'): case ('O'):
			texiputchars(p, "\\(~");
			texiputchar(p, buf[*pos]);
			break;
		default:
			texiputchar(p, buf[*pos]);
		}
		break;
	case (TEXICMD_UMLAUT):
		switch (buf[*pos]) {
		case ('a'): case ('A'):
		case ('e'): case ('E'):
		case ('i'): case ('I'):
		case ('o'): case ('O'):
		case ('u'): case ('U'):
		case ('y'):
			texiputchars(p, "\\(:");
			texiputchar(p, buf[*pos]);
			break;
		default:
			texiputchar(p, buf[*pos]);
		}
		break;
	default:
		abort();
	}
}

static void
dosymbol(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	if (p->seenws && p->outcol && 0 == p->literal) {
		texiputchar(p, ' ');
		p->seenws = 0;
	}

	switch (cmd) {
	case (TEXICMD_ASTERISK):
	case (TEXICMD_NEWLINE):
	case (TEXICMD_SPACE):
	case (TEXICMD_TABSYM):
		texiputchar(p, ' ');
		break;
	case (TEXICMD_AT):
		texiputchar(p, '@');
		break;
	case (TEXICMD_BANG):
		texiputchar(p, '!');
		break;
	case (TEXICMD_BULLET):
		texiputchars(p, "\\(bu");
		break;
	case (TEXICMD_COPYRIGHT):
		texiputchars(p, "\\(co");
		break;
	case (TEXICMD_DOTS):
		texiputchars(p, "...");
		break;
	case (TEXICMD_EQUIV):
		texiputchars(p, "\\(==");
		break;
	case (TEXICMD_ERROR):
		texiputchars(p, "error\\(->");
		break;
	case (TEXICMD_EXPANSION):
		texiputchars(p, "\\(->");
		break;
	case (TEXICMD_LATEX):
		texiputchars(p, "LaTeX");
		break;
	case (TEXICMD_MINUS):
		texiputchars(p, "\\-");
		break;
	case (TEXICMD_PERIOD):
		texiputchar(p, '.');
		break;
	case (TEXICMD_QUESTIONMARK):
		texiputchar(p, '?');
		break;
	case (TEXICMD_RESULT):
		texiputchars(p, "\\(rA");
		break;
	case (TEXICMD_SQUIGGLE_LEFT):
		texiputchars(p, "{");
		break;
	case (TEXICMD_SQUIGGLE_RIGHT):
		texiputchars(p, "}");
		break;
	case (TEXICMD_TEXSYM):
		texiputchars(p, "TeX");
		break;
	case (TEXICMD_COLON):
	case (TEXICMD_HYPHEN):
		break;
	default:
		texiwarn(p, "sym: %d", cmd);
		abort();
	}

	if (texitoks[cmd].len > 1)
		doignbracket(p, cmd, buf, sz, pos);
}

static void
doquotation(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	
	teximacro(p, "Qo");
	parseto(p, buf, sz, pos, "quotation");
	teximacro(p, "Qc");
}

static void
domath(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	size_t	 nest;

	/*
	 * Math handling is different from everything else.
	 * We don't allow any subcomponents, and we ignore the rules in
	 * terms of @-commands.
	 * This departs from GNU's rules, but whatever.
	 */
	while (*pos < sz && isws(buf[*pos]))
		advance(p, buf, pos);
	if (*pos == sz || '{' != buf[*pos])
		return;
	advance(p, buf, pos);
	if (p->seenws && p->outcol && 0 == p->literal)
		texiputchar(p, ' ');
	p->seenws = 0;
	for (nest = 1; *pos < sz && nest > 0; ) {
		if ('{' == buf[*pos])
			nest++;
		else if ('}' == buf[*pos])
			if (0 == --nest)
				continue;
		texiputchar(p, buf[*pos]);
		advance(p, buf, pos);
	}
	if (*pos == sz)
		return;
	assert('}' == buf[*pos]);
	advance(p, buf, pos);
}

static void
dovalue(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	size_t		 start, end, i;
	char		*key, *val;
	const char	*cp;

	if (TEXICMD_SET == cmd) {
		while (*pos < sz && isws(buf[*pos]))
			advance(p, buf, pos);
		for (start = end = *pos; end < sz; end++)
			if (ismspace(buf[end]))
				break;
		/* We don't allow empty keys. */
		if (start == end)
			return;
		advanceto(p, buf, pos, end);

		key = malloc(end - start + 1);
		if (NULL == key)
			texiabort(p, NULL);
		memcpy(key, &buf[start], end - start);
		key[end - start] = '\0';

		while (*pos < sz && isws(buf[*pos]))
			advance(p, buf, pos);
		for (start = end = *pos; end < sz; end++)
			if ('\n' == buf[end])
				break;
		/* We do allow empty values. */
		advanceeoln(p, buf, sz, pos, 1);

		val = malloc(end - start + 1);
		if (NULL == val)
			texiabort(p, NULL);
		memcpy(val, &buf[start], end - start);
		val[end - start] = '\0';
		valueadd(p, key, val);
	} else if (TEXICMD_VALUE == cmd) {
		if (p->seenws)
			texiputchar(p, ' ');
		p->seenws = 0;
		if (NULL != (cp = valueblookup(p, buf, sz, pos))) {
			for (i = 0; i < p->valstackpos; i++)
				if (cp == p->valstack[i])
					break;
			if (i < p->valstackpos)
				texierr(p, "recursive value");
			if (64 == p->valstackpos) 
				texierr(p, "too many nested values");
			p->valstack[p->valstackpos++] = cp;
			parseeof(p, cp, strlen(cp));
			p->valstackpos--;
		} else
			texiputchars(p, "{No value}");
	} else if (TEXICMD_IFCLEAR == cmd) {
		if (NULL != valuellookup(p, buf, sz, pos))
			doignblock(p, cmd, buf, sz, pos);
		else
			parseto(p, buf, sz, pos, texitoks[cmd].tok);
	} else if (TEXICMD_CLEAR == cmd)
		valuelclear(p, buf, sz, pos);
}

static void
dolink(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	int	 c;

	switch (cmd) {
	case (TEXICMD_EMAIL):
		teximacroopen(p, "Mt");
		break;
	case (TEXICMD_UREF):
	case (TEXICMD_URL):
		teximacroopen(p, "Lk");
		break;
	case (TEXICMD_XREF):
		texiputchars(p, "See Section");
		teximacroopen(p, "Qq");
		break;
	case (TEXICMD_PXREF):
		texiputchars(p, "see Section");
		teximacroopen(p, "Qq");
		break;
	default:
		abort();
	}

	c = parsearg(p, buf, sz, pos, 0);
	p->ign++;
	while (c > 0)
		c = parsearg(p, buf, sz, pos, 1);
	p->ign--;

	texipunctuate(p, buf, sz, pos);
	teximacroclose(p);
}

static void
doignargn(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	int	 c;

	c = parsearg(p, buf, sz, pos, 0);
	p->ign++;
	while (c > 0)
		c = parsearg(p, buf, sz, pos, 1);
	p->ign--;
}

/*
 * Sections can be made subsections and so on by way of the
 * @raiseections and @lowersections commands.
 * Perform this check here and return the actual section number adjusted
 * to the raise level.
 */
static int
sectioner(struct texi *p, int sec)
{

	if ((sec -= p->secoffs) < 0) {
		texiwarn(p, "section below minimum, clamping");
		return(0);
	} else if (sec >= SECTSZ) {
		texiwarn(p, "section above maximum, clamping");
		return(SECTSZ - 1);
	}
	return(sec);
}

static void
dosubsubsection(struct texi *p, enum texicmd cmd, 
		const char *buf, size_t sz, size_t *pos)
{
	int	 sec;

	sec = sectioner(p, 3);

	/* We don't have a subsubsubsection, so make one up. */
	texivspace(p);
	teximacroopen(p, sects[sec]);
	parseeoln(p, buf, sz, pos);
	teximacroclose(p);
	texivspace(p);
}

static void
dosubsection(struct texi *p, enum texicmd cmd, 
		const char *buf, size_t sz, size_t *pos)
{
	int	 sec;

	sec = sectioner(p, 2);

	if (p->outmacro)
		texierr(p, "\"%s\" in open line scope!?", sects[sec]);
	else if (p->literal)
		texierr(p, "\"%s\" in a literal scope!?", sects[sec]);

	/* We don't have a subsubsection, so make one up. */
	texivspace(p);
	teximacroopen(p, sects[sec]);
	parseeoln(p, buf, sz, pos);
	teximacroclose(p);
	texivspace(p);
}

static void
dosecoffs(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	if (TEXICMD_RAISESECTIONS == cmd)
		p->secoffs++;
	else
		p->secoffs--;
}

static void
dosection(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	int		 sec;

	switch (cmd) {
	case (TEXICMD_APPENDIX):
	case (TEXICMD_CHAPTER):
	case (TEXICMD_TOP):
	case (TEXICMD_UNNUMBERED):
		sec = sectioner(p, 0);
		break;
	case (TEXICMD_APPENDIXSEC):
	case (TEXICMD_HEADING):
	case (TEXICMD_SECTION):
	case (TEXICMD_UNNUMBEREDSEC):
		sec = sectioner(p, 1);
		break;
	default:
		abort();
	}

	if (p->outmacro)
		texierr(p, "\"%s\" in open line scope!?", sects[sec]);
	else if (p->literal)
		texierr(p, "\"%s\" in a literal scope!?", sects[sec]);

	teximacroopen(p, sects[sec]);
	parseeoln(p, buf, sz, pos);
	teximacroclose(p);
	p->seenvs = 1;
}

static void
dosp(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	texivspace(p);
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
}

static void
dotop(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	const char	*cp;
	time_t		 t;
	char		 date[32];

	if (--p->ign)
		texierr(p, "@top command while ignoring (%d)", p->ign);

	/*
	 * Here we print our standard mdoc(7) prologue.
	 * We use the title set with @settitle for the `Nd' description
	 * and the source document filename (the first one as invoked on
	 * the command line) for the title.
	 * The date is set to the current date.
	 */
	t = time(NULL);
	strftime(date, sizeof(date), "%F", localtime(&t));

	teximacroopen(p, "Dd");
	texiputchars(p, date);
	teximacroclose(p);
	teximacroopen(p, "Dt");
	for (cp = p->title; '\0' != *cp; cp++)
		texiputchar(p, toupper(*cp));
	texiputchars(p, " 7");
	teximacroclose(p);
	teximacro(p, "Os");
	teximacro(p, "Sh NAME");
	teximacroopen(p, "Nm");
	texiputchars(p, p->title);
	teximacroclose(p);
	teximacroopen(p, "Nd");
	texiputchars(p, NULL != p->subtitle ?
		p->subtitle : "Unknown description");
	teximacroclose(p);
	p->seenvs = 1;
	dosection(p, cmd, buf, sz, pos);
}

static void
doitem(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	/* Multitable is using raw tbl(7). */
	if (TEXILIST_TABLE == p->list) {
		texiputchar(p, '\n');
		return;
	} 
	
	if (p->outmacro)
		texierr(p, "item in open line scope!?");
	else if (p->literal)
		texierr(p, "item in a literal scope!?");

	switch (p->list) {
	case (TEXILIST_ITEM):
		teximacroopen(p, "It");
		break;
	case (TEXILIST_NOITEM):
		teximacro(p, "It");
		break;
	default:
		texivspace(p);
		break;
	}

	/* Trick so we don't start with Pp. */
	p->seenvs = 1;
	parseeoln(p, buf, sz, pos);

	if (TEXILIST_ITEM == p->list)
		teximacroclose(p);
	else if (p->outcol > 0)
		texiputchar(p, '\n');
}

static void
dotab(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	/* This command is only useful in @multitable. */
	if (TEXILIST_TABLE == p->list)
		texiputchar(p, '\t');
}

static void
domultitable(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	enum texilist	sv = p->list;
	enum texicmd	type;
	size_t		i, end, columns;

	p->list = TEXILIST_TABLE;
	teximacro(p, "TS");
	columns = 0;

	/* Advance to the first argument... */
	while (*pos < sz && isws(buf[*pos]))
		advance(p, buf, pos);

	/* Make sure we don't print anything when scanning. */
	p->ign++;
	if ('@' == buf[*pos]) {
		/* 
		 * Look for @columnfractions.
		 * We ignore these, but we do use the number of
		 * arguments to set the number of columns that we'll
		 * have.
		 */
		type = texicmd(p, buf, *pos, sz, &end);
		advanceto(p, buf, pos, end);
		if (TEXICMD_COLUMNFRACTIONS != type) 
			texierr(p, "unknown multitable command");
		while (*pos < sz && '\n' != buf[*pos]) {
			while (*pos < sz && isws(buf[*pos]))
				advance(p, buf, pos);
			while (*pos < sz && ! isws(buf[*pos])) {
				if ('\n' == buf[*pos])
					break;
				advance(p, buf, pos);
			}
			columns++;
		}
	} else 
		/*
		 * We have arguments.
		 * We could parse these, but it's easier to just let
		 * tbl(7) figure it out.
		 * So use this only to count arguments.
		 */
		while (parselinearg(p, buf, sz, pos) > 0)
			columns++;
	p->ign--;

	/* Left-justify each table entry. */
	for (i = 0; i < columns; i++) {
		if (i > 0)
			texiputchar(p, ' ');
		texiputchar(p, 'l');
	}
	texiputchars(p, ".\n");
	p->outmacro++;
	parseto(p, buf, sz, pos, texitoks[cmd].tok);
	p->outmacro--;
	teximacro(p, "TE");
	p->list = sv;
}

static void
dotable(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	enum texilist	sv = p->list;

	p->list = TEXILIST_ITEM;
	teximacro(p, "Bl -tag -width Ds");
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
	p->seenvs = 1;
	parseto(p, buf, sz, pos, texitoks[cmd].tok);
	teximacro(p, "El");
	p->list = sv;
}

static void
doenumerate(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	enum texilist	 sv = p->list;

	p->list = TEXILIST_NOITEM;
	teximacro(p, "Bl -enum");
	p->seenvs = 1;
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
	parseto(p, buf, sz, pos, "enumerate");
	teximacro(p, "El");
	p->list = sv;
}

static void
doitemize(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{
	enum texilist	sv = p->list;

	p->list = TEXILIST_NOITEM;
	teximacro(p, "Bl -bullet");
	p->seenvs = 1;
	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
	parseto(p, buf, sz, pos, "itemize");
	teximacro(p, "El");
	p->list = sv;
}

static void
doignbracket(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	p->ign++;
	parsebracket(p, buf, sz, pos);
	p->ign--;
}

static void
doignline(struct texi *p, enum texicmd cmd, 
	const char *buf, size_t sz, size_t *pos)
{

	/* FIXME: ignore and parseeoln. */
	advanceeoln(p, buf, sz, pos, 1);
}

/*
 * Parse colon-separated directories from "cp" (if not NULL) and returns
 * the array of pointers.
 * Prepends "base" to the array.
 * This does NOT sanitise the directories!
 */
static char **
parsedirs(struct texi *p, const char *base, const char *cp, size_t *sz)
{
	char	   	 *tok, *str, *tofree;
	const char 	 *cpp;
	size_t	    	  i;
	char		**dirs;

	*sz = NULL != (cpp = cp) ? 2 : 1;
	if (*sz > 1)
		for ( ; NULL != (cpp = strchr(cpp, ':')); (*sz)++)
			cpp++;

	if (NULL == (dirs = calloc(*sz, sizeof(char *))))
		texiabort(p, NULL);
	else if (NULL == (dirs[0] = strdup(base))) 
		texiabort(p, NULL);

	if (NULL == cp)
		return(dirs);
	
	if (NULL == (tofree = tok = str = strdup(cp)))
		texiabort(p, NULL);

	for (i = 1; NULL != (tok = strsep(&str, ":")); i++) 
		if (NULL == (dirs[i] = strdup(tok))) 
			texiabort(p, NULL);

	free(tofree);
	return(dirs);
}

int
main(int argc, char *argv[])
{
	struct texi	 texi;
	int		 c;
	char		*path, *dir;
	const char	*progname, *Idir, *cp;

	progname = strrchr(argv[0], '/');
	if (progname == NULL)
		progname = argv[0];
	else
		++progname;

	memset(&texi, 0, sizeof(struct texi));
	Idir = NULL;

	while (-1 != (c = getopt(argc, argv, "I:"))) 
		switch (c) {
		case ('I'):
			Idir = optarg;
			break;
		default:
			goto usage;
		}

	argv += optind;
	if (0 == (argc -= optind))
		goto usage;

	if (NULL == (path = strdup(argv[0])))
		texiabort(&texi, NULL);
	else if (NULL == (dir = dirname(path)))
		texiabort(&texi, NULL);

	free(path);

	if (NULL != (cp = strrchr(argv[0], '/'))) 
		texi.title = strdup(cp + 1);
	else
		texi.title = strdup(argv[0]);

	if (NULL == texi.title)
		texiabort(&texi, NULL);
	else if (NULL != (path = strchr(texi.title, '.')))
		*path = '\0';

	texi.ign = 1;
	texi.dirs = parsedirs(&texi, dir, Idir, &texi.dirsz);
	parsefile(&texi, argv[0], 1);
	/* We shouldn't get here. */
	texiexit(&texi);
	return(EXIT_FAILURE);
usage:
	fprintf(stderr, "usage: %s [-Idirs] file\n", progname);
	return(EXIT_FAILURE);
}