Return to html.c CVS log

Up to [cvsweb.bsd.lv] / mandoc

Completely delete the buf field of struct html and all the buf*()
interfaces.  Such a static buffer was a bad idea in the first place,
causing unfixable truncation that was only prevented by triggering
an assertion failure.  Instead, let the small number of remaining
users allocate and free their own, temporary dynamic buffers,
or for the case of .Xr and .In, pass the original data to be
assembled in print_otag().

/*	$Id: html.c,v 1.195 2017/01/17 15:32:43 schwarze Exp $ */
/*
 * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
 * Copyright (c) 2011-2015, 2017 Ingo Schwarze <schwarze@openbsd.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 <assert.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "mandoc.h"
#include "mandoc_aux.h"
#include "out.h"
#include "html.h"
#include "manconf.h"
#include "main.h"

struct	htmldata {
	const char	 *name;
	int		  flags;
#define	HTML_CLRLINE	 (1 << 0)
#define	HTML_NOSTACK	 (1 << 1)
#define	HTML_AUTOCLOSE	 (1 << 2) /* Tag has auto-closure. */
};

static	const struct htmldata htmltags[TAG_MAX] = {
	{"html",	HTML_CLRLINE}, /* TAG_HTML */
	{"head",	HTML_CLRLINE}, /* TAG_HEAD */
	{"body",	HTML_CLRLINE}, /* TAG_BODY */
	{"meta",	HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_META */
	{"title",	HTML_CLRLINE}, /* TAG_TITLE */
	{"div",		HTML_CLRLINE}, /* TAG_DIV */
	{"h1",		0}, /* TAG_H1 */
	{"h2",		0}, /* TAG_H2 */
	{"span",	0}, /* TAG_SPAN */
	{"link",	HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_LINK */
	{"br",		HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_BR */
	{"a",		0}, /* TAG_A */
	{"table",	HTML_CLRLINE}, /* TAG_TABLE */
	{"tbody",	HTML_CLRLINE}, /* TAG_TBODY */
	{"col",		HTML_CLRLINE | HTML_NOSTACK | HTML_AUTOCLOSE}, /* TAG_COL */
	{"tr",		HTML_CLRLINE}, /* TAG_TR */
	{"td",		HTML_CLRLINE}, /* TAG_TD */
	{"li",		HTML_CLRLINE}, /* TAG_LI */
	{"ul",		HTML_CLRLINE}, /* TAG_UL */
	{"ol",		HTML_CLRLINE}, /* TAG_OL */
	{"dl",		HTML_CLRLINE}, /* TAG_DL */
	{"dt",		HTML_CLRLINE}, /* TAG_DT */
	{"dd",		HTML_CLRLINE}, /* TAG_DD */
	{"blockquote",	HTML_CLRLINE}, /* TAG_BLOCKQUOTE */
	{"pre",		HTML_CLRLINE }, /* TAG_PRE */
	{"b",		0 }, /* TAG_B */
	{"i",		0 }, /* TAG_I */
	{"code",	0 }, /* TAG_CODE */
	{"small",	0 }, /* TAG_SMALL */
	{"style",	HTML_CLRLINE}, /* TAG_STYLE */
	{"math",	HTML_CLRLINE}, /* TAG_MATH */
	{"mrow",	0}, /* TAG_MROW */
	{"mi",		0}, /* TAG_MI */
	{"mo",		0}, /* TAG_MO */
	{"msup",	0}, /* TAG_MSUP */
	{"msub",	0}, /* TAG_MSUB */
	{"msubsup",	0}, /* TAG_MSUBSUP */
	{"mfrac",	0}, /* TAG_MFRAC */
	{"msqrt",	0}, /* TAG_MSQRT */
	{"mfenced",	0}, /* TAG_MFENCED */
	{"mtable",	0}, /* TAG_MTABLE */
	{"mtr",		0}, /* TAG_MTR */
	{"mtd",		0}, /* TAG_MTD */
	{"munderover",	0}, /* TAG_MUNDEROVER */
	{"munder",	0}, /* TAG_MUNDER*/
	{"mover",	0}, /* TAG_MOVER*/
};

static	const char	*const roffscales[SCALE_MAX] = {
	"cm", /* SCALE_CM */
	"in", /* SCALE_IN */
	"pc", /* SCALE_PC */
	"pt", /* SCALE_PT */
	"em", /* SCALE_EM */
	"em", /* SCALE_MM */
	"ex", /* SCALE_EN */
	"ex", /* SCALE_BU */
	"em", /* SCALE_VS */
	"ex", /* SCALE_FS */
};

static	void	 a2width(const char *, struct roffsu *);
static	void	 print_ctag(struct html *, struct tag *);
static	int	 print_escape(char);
static	int	 print_encode(struct html *, const char *, const char *, int);
static	void	 print_href(struct html *, const char *, const char *, int);
static	void	 print_metaf(struct html *, enum mandoc_esc);


void *
html_alloc(const struct manoutput *outopts)
{
	struct html	*h;

	h = mandoc_calloc(1, sizeof(struct html));

	h->tags.head = NULL;
	h->style = outopts->style;
	h->base_man = outopts->man;
	h->base_includes = outopts->includes;
	if (outopts->fragment)
		h->oflags |= HTML_FRAGMENT;

	return h;
}

void
html_free(void *p)
{
	struct tag	*tag;
	struct html	*h;

	h = (struct html *)p;

	while ((tag = h->tags.head) != NULL) {
		h->tags.head = tag->next;
		free(tag);
	}

	free(h);
}

void
print_gen_head(struct html *h)
{
	struct tag	*t;

	print_otag(h, TAG_META, "?", "charset", "utf-8");

	/*
	 * Print a default style-sheet.
	 */
	t = print_otag(h, TAG_STYLE, "");
	print_text(h, "table.head, table.foot { width: 100%; }\n"
	      "td.head-rtitle, td.foot-os { text-align: right; }\n"
	      "td.head-vol { text-align: center; }\n"
	      "table.foot td { width: 50%; }\n"
	      "table.head td { width: 33%; }\n"
	      "div.spacer { margin: 1em 0; }\n");
	print_tagq(h, t);

	if (h->style)
		print_otag(h, TAG_LINK, "?h??", "rel", "stylesheet",
		    h->style, "type", "text/css", "media", "all");
}

static void
print_metaf(struct html *h, enum mandoc_esc deco)
{
	enum htmlfont	 font;

	switch (deco) {
	case ESCAPE_FONTPREV:
		font = h->metal;
		break;
	case ESCAPE_FONTITALIC:
		font = HTMLFONT_ITALIC;
		break;
	case ESCAPE_FONTBOLD:
		font = HTMLFONT_BOLD;
		break;
	case ESCAPE_FONTBI:
		font = HTMLFONT_BI;
		break;
	case ESCAPE_FONT:
	case ESCAPE_FONTROMAN:
		font = HTMLFONT_NONE;
		break;
	default:
		abort();
	}

	if (h->metaf) {
		print_tagq(h, h->metaf);
		h->metaf = NULL;
	}

	h->metal = h->metac;
	h->metac = font;

	switch (font) {
	case HTMLFONT_ITALIC:
		h->metaf = print_otag(h, TAG_I, "");
		break;
	case HTMLFONT_BOLD:
		h->metaf = print_otag(h, TAG_B, "");
		break;
	case HTMLFONT_BI:
		h->metaf = print_otag(h, TAG_B, "");
		print_otag(h, TAG_I, "");
		break;
	default:
		break;
	}
}

int
html_strlen(const char *cp)
{
	size_t		 rsz;
	int		 skip, sz;

	/*
	 * Account for escaped sequences within string length
	 * calculations.  This follows the logic in term_strlen() as we
	 * must calculate the width of produced strings.
	 * Assume that characters are always width of "1".  This is
	 * hacky, but it gets the job done for approximation of widths.
	 */

	sz = 0;
	skip = 0;
	while (1) {
		rsz = strcspn(cp, "\\");
		if (rsz) {
			cp += rsz;
			if (skip) {
				skip = 0;
				rsz--;
			}
			sz += rsz;
		}
		if ('\0' == *cp)
			break;
		cp++;
		switch (mandoc_escape(&cp, NULL, NULL)) {
		case ESCAPE_ERROR:
			return sz;
		case ESCAPE_UNICODE:
		case ESCAPE_NUMBERED:
		case ESCAPE_SPECIAL:
		case ESCAPE_OVERSTRIKE:
			if (skip)
				skip = 0;
			else
				sz++;
			break;
		case ESCAPE_SKIPCHAR:
			skip = 1;
			break;
		default:
			break;
		}
	}
	return sz;
}

static int
print_escape(char c)
{

	switch (c) {
	case '<':
		printf("&lt;");
		break;
	case '>':
		printf("&gt;");
		break;
	case '&':
		printf("&amp;");
		break;
	case '"':
		printf("&quot;");
		break;
	case ASCII_NBRSP:
		printf("&nbsp;");
		break;
	case ASCII_HYPH:
		putchar('-');
		break;
	case ASCII_BREAK:
		break;
	default:
		return 0;
	}
	return 1;
}

static int
print_encode(struct html *h, const char *p, const char *pend, int norecurse)
{
	size_t		 sz;
	int		 c, len, nospace;
	const char	*seq;
	enum mandoc_esc	 esc;
	static const char rejs[9] = { '\\', '<', '>', '&', '"',
		ASCII_NBRSP, ASCII_HYPH, ASCII_BREAK, '\0' };

	if (pend == NULL)
		pend = strchr(p, '\0');

	nospace = 0;

	while (p < pend) {
		if (HTML_SKIPCHAR & h->flags && '\\' != *p) {
			h->flags &= ~HTML_SKIPCHAR;
			p++;
			continue;
		}

		sz = strcspn(p, rejs);
		if (p + sz > pend)
			sz = pend - p;

		fwrite(p, 1, sz, stdout);
		p += (int)sz;

		if (p >= pend)
			break;

		if (print_escape(*p++))
			continue;

		esc = mandoc_escape(&p, &seq, &len);
		if (ESCAPE_ERROR == esc)
			break;

		switch (esc) {
		case ESCAPE_FONT:
		case ESCAPE_FONTPREV:
		case ESCAPE_FONTBOLD:
		case ESCAPE_FONTITALIC:
		case ESCAPE_FONTBI:
		case ESCAPE_FONTROMAN:
			if (0 == norecurse)
				print_metaf(h, esc);
			continue;
		case ESCAPE_SKIPCHAR:
			h->flags |= HTML_SKIPCHAR;
			continue;
		default:
			break;
		}

		if (h->flags & HTML_SKIPCHAR) {
			h->flags &= ~HTML_SKIPCHAR;
			continue;
		}

		switch (esc) {
		case ESCAPE_UNICODE:
			/* Skip past "u" header. */
			c = mchars_num2uc(seq + 1, len - 1);
			break;
		case ESCAPE_NUMBERED:
			c = mchars_num2char(seq, len);
			if (c < 0)
				continue;
			break;
		case ESCAPE_SPECIAL:
			c = mchars_spec2cp(seq, len);
			if (c <= 0)
				continue;
			break;
		case ESCAPE_NOSPACE:
			if ('\0' == *p)
				nospace = 1;
			continue;
		case ESCAPE_OVERSTRIKE:
			if (len == 0)
				continue;
			c = seq[len - 1];
			break;
		default:
			continue;
		}
		if ((c < 0x20 && c != 0x09) ||
		    (c > 0x7E && c < 0xA0))
			c = 0xFFFD;
		if (c > 0x7E)
			printf("&#%d;", c);
		else if ( ! print_escape(c))
			putchar(c);
	}

	return nospace;
}

static void
print_href(struct html *h, const char *name, const char *sec, int man)
{
	const char	*p, *pp;

	pp = man ? h->base_man : h->base_includes;
	while ((p = strchr(pp, '%')) != NULL) {
		print_encode(h, pp, p, 1);
		if (man && p[1] == 'S') {
			if (sec == NULL)
				putchar('1');
			else
				print_encode(h, sec, NULL, 1);
		} else if ((man && p[1] == 'N') ||
		    (man == 0 && p[1] == 'I'))
			print_encode(h, name, NULL, 1);
		else
			print_encode(h, p, p + 2, 1);
		pp = p + 2;
	}
	if (*pp != '\0')
		print_encode(h, pp, NULL, 1);
}

struct tag *
print_otag(struct html *h, enum htmltag tag, const char *fmt, ...)
{
	va_list		 ap;
	struct roffsu	 mysu, *su;
	struct tag	*t;
	const char	*attr;
	char		*s;
	double		 v;
	int		 i, have_style;

	/* Push this tags onto the stack of open scopes. */

	if ( ! (HTML_NOSTACK & htmltags[tag].flags)) {
		t = mandoc_malloc(sizeof(struct tag));
		t->tag = tag;
		t->next = h->tags.head;
		h->tags.head = t;
	} else
		t = NULL;

	if ( ! (HTML_NOSPACE & h->flags))
		if ( ! (HTML_CLRLINE & htmltags[tag].flags)) {
			/* Manage keeps! */
			if ( ! (HTML_KEEP & h->flags)) {
				if (HTML_PREKEEP & h->flags)
					h->flags |= HTML_KEEP;
				putchar(' ');
			} else
				printf("&#160;");
		}

	if ( ! (h->flags & HTML_NONOSPACE))
		h->flags &= ~HTML_NOSPACE;
	else
		h->flags |= HTML_NOSPACE;

	/* Print out the tag name and attributes. */

	printf("<%s", htmltags[tag].name);

	va_start(ap, fmt);

	have_style = 0;
	while (*fmt != '\0') {
		if (*fmt == 's') {
			printf(" style=\"");
			have_style = 1;
			fmt++;
			break;
		}
		s = va_arg(ap, char *);
		switch (*fmt++) {
		case 'c':
			attr = "class";
			break;
		case 'h':
			attr = "href";
			break;
		case 'i':
			attr = "id";
			break;
		case '?':
			attr = s;
			s = va_arg(ap, char *);
			break;
		default:
			abort();
		}
		printf(" %s=\"", attr);
		switch (*fmt) {
		case 'M':
			print_href(h, s, va_arg(ap, char *), 1);
			fmt++;
			break;
		case 'I':
			print_href(h, s, NULL, 0);
			fmt++;
			break;
		case 'R':
			putchar('#');
			fmt++;
			/* FALLTHROUGH */
		default:
			print_encode(h, s, NULL, 1);
			break;
		}
		putchar('"');
	}

	/* Print out styles. */

	s = NULL;
	su = &mysu;
	while (*fmt != '\0') {

		/* First letter: input argument type. */

		switch (*fmt++) {
		case 'h':
			i = va_arg(ap, int);
			SCALE_HS_INIT(su, i);
			break;
		case 's':
			s = va_arg(ap, char *);
			break;
		case 'u':
			su = va_arg(ap, struct roffsu *);
			break;
		case 'v':
			i = va_arg(ap, int);
			SCALE_VS_INIT(su, i);
			break;
		case 'w':
			s = va_arg(ap, char *);
			a2width(s, su);
			break;
		default:
			abort();
		}

		/* Second letter: style name. */

		switch (*fmt++) {
		case 'b':
			attr = "margin-bottom";
			break;
		case 'h':
			attr = "height";
			break;
		case 'i':
			attr = "text-indent";
			break;
		case 'l':
			attr = "margin-left";
			break;
		case 't':
			attr = "margin-top";
			break;
		case 'w':
			attr = "width";
			break;
		case 'W':
			attr = "min-width";
			break;
		case '?':
			printf("%s: %s;", s, va_arg(ap, char *));
			continue;
		default:
			abort();
		}
		v = su->scale;
		if (su->unit == SCALE_MM && (v /= 100.0) == 0.0)
			v = 1.0;
		else if (su->unit == SCALE_BU)
			v /= 24.0;
		printf("%s: %.2f%s;", attr, v, roffscales[su->unit]);
	}
	if (have_style)
		putchar('"');

	va_end(ap);

	/* Accommodate for "well-formed" singleton escaping. */

	if (HTML_AUTOCLOSE & htmltags[tag].flags)
		putchar('/');

	putchar('>');

	h->flags |= HTML_NOSPACE;

	if ((HTML_AUTOCLOSE | HTML_CLRLINE) & htmltags[tag].flags)
		putchar('\n');

	return t;
}

static void
print_ctag(struct html *h, struct tag *tag)
{

	/*
	 * Remember to close out and nullify the current
	 * meta-font and table, if applicable.
	 */
	if (tag == h->metaf)
		h->metaf = NULL;
	if (tag == h->tblt)
		h->tblt = NULL;

	printf("</%s>", htmltags[tag->tag].name);
	if (HTML_CLRLINE & htmltags[tag->tag].flags) {
		h->flags |= HTML_NOSPACE;
		putchar('\n');
	}

	h->tags.head = tag->next;
	free(tag);
}

void
print_gen_decls(struct html *h)
{

	puts("<!DOCTYPE html>");
}

void
print_text(struct html *h, const char *word)
{

	if ( ! (HTML_NOSPACE & h->flags)) {
		/* Manage keeps! */
		if ( ! (HTML_KEEP & h->flags)) {
			if (HTML_PREKEEP & h->flags)
				h->flags |= HTML_KEEP;
			putchar(' ');
		} else
			printf("&#160;");
	}

	assert(NULL == h->metaf);
	switch (h->metac) {
	case HTMLFONT_ITALIC:
		h->metaf = print_otag(h, TAG_I, "");
		break;
	case HTMLFONT_BOLD:
		h->metaf = print_otag(h, TAG_B, "");
		break;
	case HTMLFONT_BI:
		h->metaf = print_otag(h, TAG_B, "");
		print_otag(h, TAG_I, "");
		break;
	default:
		break;
	}

	assert(word);
	if ( ! print_encode(h, word, NULL, 0)) {
		if ( ! (h->flags & HTML_NONOSPACE))
			h->flags &= ~HTML_NOSPACE;
		h->flags &= ~HTML_NONEWLINE;
	} else
		h->flags |= HTML_NOSPACE | HTML_NONEWLINE;

	if (h->metaf) {
		print_tagq(h, h->metaf);
		h->metaf = NULL;
	}

	h->flags &= ~HTML_IGNDELIM;
}

void
print_tagq(struct html *h, const struct tag *until)
{
	struct tag	*tag;

	while ((tag = h->tags.head) != NULL) {
		print_ctag(h, tag);
		if (until && tag == until)
			return;
	}
}

void
print_stagq(struct html *h, const struct tag *suntil)
{
	struct tag	*tag;

	while ((tag = h->tags.head) != NULL) {
		if (suntil && tag == suntil)
			return;
		print_ctag(h, tag);
	}
}

void
print_paragraph(struct html *h)
{
	struct tag	*t;

	t = print_otag(h, TAG_DIV, "c", "spacer");
	print_tagq(h, t);
}


/*
 * Calculate the scaling unit passed in a `-width' argument.  This uses
 * either a native scaling unit (e.g., 1i, 2m) or the string length of
 * the value.
 */
static void
a2width(const char *p, struct roffsu *su)
{
	if (a2roffsu(p, su, SCALE_MAX) < 2) {
		su->unit = SCALE_EN;
		su->scale = html_strlen(p);
	} else if (su->scale < 0.0)
		su->scale = 0.0;
}