rustdoc: Add sundown to src/rt/

This also starts compiling it in the same manner as linenoise, it's just bundled
with librustrt directly, and we export just a few symbols out of it.

configure

@@ -684,7 +684,7 @@ do
       isaac linenoise sync test \
       arch/i386 arch/x86_64 arch/arm arch/mips  \
       libuv libuv/src/ares libuv/src/eio libuv/src/ev \
-      jemalloc
+      jemalloc sundown/src sundown/html
     do
       make_dir $t/rt/stage$s/$i
     done

mk/rt.mk

@@ -82,7 +82,16 @@ RUNTIME_CXXS_$(1)_$(2) := \
               rt/rust_android_dummy.cpp \
               rt/rust_test_helpers.cpp
 
-RUNTIME_CS_$(1)_$(2) := rt/linenoise/linenoise.c rt/linenoise/utf8.c
+RUNTIME_CS_$(1)_$(2) := rt/linenoise/linenoise.c \
+			rt/linenoise/utf8.c \
+			rt/sundown/src/autolink.c \
+			rt/sundown/src/buffer.c \
+			rt/sundown/src/stack.c \
+			rt/sundown/src/markdown.c \
+			rt/sundown/html/houdini_href_e.c \
+			rt/sundown/html/houdini_html_e.c \
+			rt/sundown/html/html_smartypants.c \
+			rt/sundown/html/html.c
 
 RUNTIME_S_$(1)_$(2) := rt/arch/$$(HOST_$(1))/_context.S \
 			rt/arch/$$(HOST_$(1))/ccall.S \
@@ -117,6 +126,8 @@ RUNTIME_DEF_$(1)_$(2) := $$(RT_OUTPUT_DIR_$(1))/rustrt$$(CFG_DEF_SUFFIX_$(1))
 RUNTIME_INCS_$(1)_$(2) := -I $$(S)src/rt -I $$(S)src/rt/isaac -I $$(S)src/rt/uthash \
                      -I $$(S)src/rt/arch/$$(HOST_$(1)) \
                      -I $$(S)src/rt/linenoise \
+                     -I $$(S)src/rt/sundown/src \
+                     -I $$(S)src/rt/sundown/html \
                      -I $$(S)src/libuv/include
 RUNTIME_OBJS_$(1)_$(2) := $$(RUNTIME_CXXS_$(1)_$(2):rt/%.cpp=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \
                      $$(RUNTIME_CS_$(1)_$(2):rt/%.c=$$(RT_BUILD_DIR_$(1)_$(2))/%.o) \

mk/tests.mk

@@ -227,8 +227,9 @@ ALL_CS := $(wildcard $(S)src/rt/*.cpp \
                      $(S)src/rt/*/*/*.cpp \
                      $(S)src/rustllvm/*.cpp)
 ALL_CS := $(filter-out $(S)src/rt/miniz.cpp \
-                       $(S)src/rt/linenoise/linenoise.c \
+		       $(wildcard $(S)src/rt/linenoise/*.c) \
-                       $(S)src/rt/linenoise/utf8.c \
+		       $(wildcard $(S)src/rt/sundown/src/*.c) \
+		       $(wildcard $(S)src/rt/sundown/html/*.c) \
 	,$(ALL_CS))
 ALL_HS := $(wildcard $(S)src/rt/*.h \
                      $(S)src/rt/*/*.h \
@@ -241,6 +242,8 @@ ALL_HS := $(filter-out $(S)src/rt/vg/valgrind.h \
                        $(S)src/rt/msvc/inttypes.h \
                        $(S)src/rt/linenoise/linenoise.h \
                        $(S)src/rt/linenoise/utf8.h \
+		       $(wildcard $(S)src/rt/sundown/src/*.h) \
+		       $(wildcard $(S)src/rt/sundown/html/*.h) \
 	,$(ALL_HS))
 
 # Run the tidy script in multiple parts to avoid huge 'echo' commands

src/rt/rustrt.def.in

@@ -200,3 +200,9 @@ rust_set_stdio_container_fd
 rust_set_stdio_container_stream
 rust_uv_process_pid
 rust_uv_pipe_init
+sdhtml_renderer
+sd_markdown_new
+sd_markdown_render
+sd_markdown_free
+bufrelease
+bufnew

src/rt/sundown/.gitignore

@@ -0,0 +1,5 @@
+*.o
+libsundown.so*
+sundown
+smartypants
+*.exe

src/rt/sundown/CONTRIBUTING.md

@@ -0,0 +1,10 @@
+Contributing to Sundown
+=======================
+
+Do not.
+
+Unfortunately, Sundown is currently frozen as we're working with the Reddit, StackOverflow and Meteor developers to design a formal Markdown standard and parser that will supersede Sundown in all these websites (and in GitHub, of course). Our goal is to deprecate Sundown altogether before the end of the year.
+
+The new parser will be smaller, faster, safer and most importantly, more consistent.
+
+Please stay tuned.

src/rt/sundown/Makefile

@@ -0,0 +1,83 @@
+# Makefile
+
+# Copyright (c) 2009, Natacha Porté
+#
+# 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.
+
+DEPDIR=depends
+
+# "Machine-dependant" options
+#MFLAGS=-fPIC
+
+CFLAGS=-c -g -O3 -fPIC -Wall -Werror -Wsign-compare -Isrc -Ihtml
+LDFLAGS=-g -O3 -Wall -Werror 
+CC=gcc
+
+
+SUNDOWN_SRC=\
+	src/markdown.o \
+	src/stack.o \
+	src/buffer.o \
+	src/autolink.o \
+	html/html.o \
+	html/html_smartypants.o \
+	html/houdini_html_e.o \
+	html/houdini_href_e.o
+
+all:		libsundown.so sundown smartypants html_blocks
+
+.PHONY:		all clean
+
+# libraries
+
+libsundown.so:	libsundown.so.1
+	ln -f -s $^ $@
+
+libsundown.so.1: $(SUNDOWN_SRC)
+	$(CC) $(LDFLAGS) -shared -Wl $^ -o $@
+
+# executables
+
+sundown:	examples/sundown.o $(SUNDOWN_SRC)
+	$(CC) $(LDFLAGS) $^ -o $@
+
+smartypants: examples/smartypants.o $(SUNDOWN_SRC)
+	$(CC) $(LDFLAGS) $^ -o $@
+
+# perfect hashing
+html_blocks: src/html_blocks.h
+
+src/html_blocks.h: html_block_names.txt
+	gperf -N find_block_tag -H hash_block_tag -C -c -E --ignore-case $^ > $@
+
+
+# housekeeping
+clean:
+	rm -f src/*.o html/*.o examples/*.o
+	rm -f libsundown.so libsundown.so.1 sundown smartypants
+	rm -f sundown.exe smartypants.exe
+	rm -rf $(DEPDIR)
+
+
+# dependencies
+
+include $(wildcard $(DEPDIR)/*.d)
+
+
+# generic object compilations
+
+%.o:	src/%.c examples/%.c html/%.c
+	@mkdir -p $(DEPDIR)
+	@$(CC) -MM $< > $(DEPDIR)/$*.d
+	$(CC) $(CFLAGS) -o $@ $<
+

src/rt/sundown/Makefile.win

@@ -0,0 +1,33 @@
+
+CFLAGS=/O2 /EHsc /I"src/" /I"examples"/ /I"html"/
+CC=cl
+
+SUNDOWN_SRC=\
+	src\markdown.obj \
+	src\stack.obj \
+	src\buffer.obj \
+	src\autolink.obj \
+	html\html.obj \
+	html\html_smartypants.obj \
+	html\houdini_html_e.obj \
+	html\houdini_href_e.obj
+
+all: sundown.dll sundown.exe
+
+sundown.dll: $(SUNDOWN_SRC) sundown.def
+	$(CC) $(SUNDOWN_SRC) sundown.def /link /DLL $(LDFLAGS) /out:$@
+
+sundown.exe: examples\sundown.obj $(SUNDOWN_SRC)
+	$(CC) examples\sundown.obj $(SUNDOWN_SRC) /link $(LDFLAGS) /out:$@
+
+# housekeeping
+clean:
+	del $(SUNDOWN_SRC)
+	del sundown.dll sundown.exe
+	del sundown.exp sundown.lib
+
+# generic object compilations
+
+.c.obj:
+	$(CC) $(CFLAGS) /c $< /Fo$@
+

src/rt/sundown/README.markdown

@@ -0,0 +1,131 @@
+Sundown
+=======
+
+`Sundown` is a Markdown parser based on the original code of the
+[Upskirt library](http://fossil.instinctive.eu/libupskirt/index) by Natacha Porté.
+
+Features
+--------
+
+*	**Fully standards compliant**
+
+	`Sundown` passes out of the box the official Markdown v1.0.0 and v1.0.3
+	test suites, and has been extensively tested with additional corner cases
+	to make sure its output is as sane as possible at all times.
+
+*	**Massive extension support**
+
+	`Sundown` has optional support for several (unofficial) Markdown extensions,
+	such as non-strict emphasis, fenced code blocks, tables, autolinks,
+	strikethrough and more.
+
+*	**UTF-8 aware**
+
+	`Sundown` is fully UTF-8 aware, both when parsing the source document and when
+	generating the resulting (X)HTML code.
+
+*	**Tested & Ready to be used on production**
+
+	`Sundown` has been extensively security audited, and includes protection against
+	all possible DOS attacks (stack overflows, out of memory situations, malformed
+	Markdown syntax...) and against client attacks through malicious embedded HTML.
+
+	We've worked very hard to make `Sundown` never crash or run out of memory
+	under *any* input. `Sundown` renders all the Markdown content in GitHub and so
+	far hasn't crashed a single time.
+
+*	**Customizable renderers**
+
+	`Sundown` is not stuck with XHTML output: the Markdown parser of the library
+	is decoupled from the renderer, so it's trivial to extend the library with
+	custom renderers. A fully functional (X)HTML renderer is included.
+
+*	**Optimized for speed**
+
+	`Sundown` is written in C, with a special emphasis on performance. When wrapped
+	on a dynamic language such as Python or Ruby, it has shown to be up to 40
+	times faster than other native alternatives.
+
+*	**Zero-dependency**
+
+	`Sundown` is a zero-dependency library composed of 3 `.c` files and their headers.
+	No dependencies, no bullshit. Only standard C99 that builds everywhere.
+
+Credits
+-------
+
+`Sundown` is based on the original Upskirt parser by Natacha Porté, with many additions
+by Vicent Marti (@vmg) and contributions from the following authors:
+
+	Ben Noordhuis, Bruno Michel, Joseph Koshy, Krzysztof Kowalczyk, Samuel Bronson,
+	Shuhei Tanuma
+
+Bindings
+--------
+
+`Sundown` is available from other programming languages thanks to these bindings developed
+by our awesome contributors.
+
+- [Redcarpet](https://github.com/vmg/redcarpet) (Ruby)
+- [RobotSkirt](https://github.com/benmills/robotskirt) (Node.js)
+- [Misaka](https://github.com/FSX/misaka) (Python)
+- [ffi-sundown](https://github.com/postmodern/ffi-sundown) (Ruby FFI)
+- [Sundown HS](https://github.com/bitonic/sundown) (Haskell)
+- [Goskirt](https://github.com/madari/goskirt) (Go)
+- [Upskirt.go](https://github.com/buu700/upskirt.go) (Go)
+- [MoonShine](https://github.com/brandonc/moonshine) (.NET)
+- [PHP-Sundown](https://github.com/chobie/php-sundown) (PHP)
+- [Sundown.net](https://github.com/txdv/sundown.net) (.NET)
+
+Help us
+-------
+
+`Sundown` is all about security. If you find a (potential) security vulnerability in the
+library, or a way to make it crash through malicious input, please report it to us,
+either directly via email or by opening an Issue on GitHub, and help make the web safer
+for everybody.
+
+Unicode character handling
+--------------------------
+
+Given that the Markdown spec makes no provision for Unicode character handling, `Sundown`
+takes a conservative approach towards deciding which extended characters trigger Markdown
+features:
+
+*	Punctuation characters outside of the U+007F codepoint are not handled as punctuation.
+	They are considered as normal, in-word characters for word-boundary checks.
+
+*	Whitespace characters outside of the U+007F codepoint are not considered as
+	whitespace. They are considered as normal, in-word characters for word-boundary checks.
+
+Install
+-------
+
+There is nothing to install. `Sundown` is composed of 3 `.c` files (`markdown.c`,
+`buffer.c` and `array.c`), so just throw them in your project. Zero-dependency means
+zero-dependency. You might want to include `render/html.c` if you want to use the
+included XHTML renderer, or write your own renderer. Either way, it's all fun and joy.
+
+If you are hardcore, you can use the included `Makefile` to build `Sundown` into a dynamic
+library, or to build the sample `sundown` executable, which is just a commandline
+Markdown to XHTML parser. (If gcc gives you grief about `-fPIC`, e.g. with MinGW, try
+`make MFLAGS=` instead of just `make`.)
+
+License
+-------
+
+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.
+
+<!-- Local Variables: -->
+<!-- fill-column: 89 -->
+<!-- End: -->

src/rt/sundown/examples/smartypants.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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 "markdown.h"
+#include "html.h"
+#include "buffer.h"
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define READ_UNIT 1024
+#define OUTPUT_UNIT 64
+
+int
+main(int argc, char **argv)
+{
+	struct buf *ib, *ob;
+	size_t ret;
+	FILE *in = stdin;
+
+	/* opening the file if given from the command line */
+	if (argc > 1) {
+		in = fopen(argv[1], "r");
+		if (!in) {
+			fprintf(stderr, "Unable to open input file \"%s\": %s\n", argv[0], strerror(errno));
+			return 1;
+		}
+	}
+
+	/* reading everything */
+	ib = bufnew(READ_UNIT);
+	bufgrow(ib, READ_UNIT);
+	while ((ret = fread(ib->data + ib->size, 1, ib->asize - ib->size, in)) > 0) {
+		ib->size += ret;
+		bufgrow(ib, ib->size + READ_UNIT);
+	}
+
+	if (in != stdin)
+		fclose(in);
+
+	/* performing markdown parsing */
+	ob = bufnew(OUTPUT_UNIT);
+
+	sdhtml_smartypants(ob, ib->data, ib->size);
+
+	/* writing the result to stdout */
+	(void)fwrite(ob->data, 1, ob->size, stdout);
+
+	/* cleanup */
+	bufrelease(ib);
+	bufrelease(ob);
+
+	return 0;
+}
+
+/* vim: set filetype=c: */

src/rt/sundown/examples/sundown.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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 "markdown.h"
+#include "html.h"
+#include "buffer.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define READ_UNIT 1024
+#define OUTPUT_UNIT 64
+
+/* main • main function, interfacing STDIO with the parser */
+int
+main(int argc, char **argv)
+{
+	struct buf *ib, *ob;
+	int ret;
+	FILE *in = stdin;
+
+	struct sd_callbacks callbacks;
+	struct html_renderopt options;
+	struct sd_markdown *markdown;
+
+	/* opening the file if given from the command line */
+	if (argc > 1) {
+		in = fopen(argv[1], "r");
+		if (!in) {
+			fprintf(stderr,"Unable to open input file \"%s\": %s\n", argv[1], strerror(errno));
+			return 1;
+		}
+	}
+
+	/* reading everything */
+	ib = bufnew(READ_UNIT);
+	bufgrow(ib, READ_UNIT);
+	while ((ret = fread(ib->data + ib->size, 1, ib->asize - ib->size, in)) > 0) {
+		ib->size += ret;
+		bufgrow(ib, ib->size + READ_UNIT);
+	}
+
+	if (in != stdin)
+		fclose(in);
+
+	/* performing markdown parsing */
+	ob = bufnew(OUTPUT_UNIT);
+
+	sdhtml_renderer(&callbacks, &options, 0);
+	markdown = sd_markdown_new(0, 16, &callbacks, &options);
+
+	sd_markdown_render(ob, ib->data, ib->size, markdown);
+	sd_markdown_free(markdown);
+
+	/* writing the result to stdout */
+	ret = fwrite(ob->data, 1, ob->size, stdout);
+
+	/* cleanup */
+	bufrelease(ib);
+	bufrelease(ob);
+
+	return (ret < 0) ? -1 : 0;
+}
+
+/* vim: set filetype=c: */

src/rt/sundown/html/houdini.h

@@ -0,0 +1,37 @@
+#ifndef HOUDINI_H__
+#define HOUDINI_H__
+
+#include "buffer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef HOUDINI_USE_LOCALE
+#	define _isxdigit(c) isxdigit(c)
+#	define _isdigit(c) isdigit(c)
+#else
+/*
+ * Helper _isdigit methods -- do not trust the current locale
+ * */
+#	define _isxdigit(c) (strchr("0123456789ABCDEFabcdef", (c)) != NULL)
+#	define _isdigit(c) ((c) >= '0' && (c) <= '9')
+#endif
+
+extern void houdini_escape_html(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_html0(struct buf *ob, const uint8_t *src, size_t size, int secure);
+extern void houdini_unescape_html(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_xml(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_uri(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_url(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_href(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_unescape_uri(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_unescape_url(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_escape_js(struct buf *ob, const uint8_t *src, size_t size);
+extern void houdini_unescape_js(struct buf *ob, const uint8_t *src, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/rt/sundown/html/houdini_href_e.c

@@ -0,0 +1,108 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "houdini.h"
+
+#define ESCAPE_GROW_FACTOR(x) (((x) * 12) / 10)
+
+/*
+ * The following characters will not be escaped:
+ *
+ *		-_.+!*'(),%#@?=;:/,+&$ alphanum
+ *
+ * Note that this character set is the addition of:
+ *
+ *	- The characters which are safe to be in an URL
+ *	- The characters which are *not* safe to be in
+ *	an URL because they are RESERVED characters.
+ *
+ * We asume (lazily) that any RESERVED char that
+ * appears inside an URL is actually meant to
+ * have its native function (i.e. as an URL 
+ * component/separator) and hence needs no escaping.
+ *
+ * There are two exceptions: the chacters & (amp)
+ * and ' (single quote) do not appear in the table.
+ * They are meant to appear in the URL as components,
+ * yet they require special HTML-entity escaping
+ * to generate valid HTML markup.
+ *
+ * All other characters will be escaped to %XX.
+ *
+ */
+static const char HREF_SAFE[] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 
+	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+void
+houdini_escape_href(struct buf *ob, const uint8_t *src, size_t size)
+{
+	static const char hex_chars[] = "0123456789ABCDEF";
+	size_t  i = 0, org;
+	char hex_str[3];
+
+	bufgrow(ob, ESCAPE_GROW_FACTOR(size));
+	hex_str[0] = '%';
+
+	while (i < size) {
+		org = i;
+		while (i < size && HREF_SAFE[src[i]] != 0)
+			i++;
+
+		if (i > org)
+			bufput(ob, src + org, i - org);
+
+		/* escaping */
+		if (i >= size)
+			break;
+
+		switch (src[i]) {
+		/* amp appears all the time in URLs, but needs
+		 * HTML-entity escaping to be inside an href */
+		case '&': 
+			BUFPUTSL(ob, "&amp;");
+			break;
+
+		/* the single quote is a valid URL character
+		 * according to the standard; it needs HTML
+		 * entity escaping too */
+		case '\'':
+			BUFPUTSL(ob, "&#x27;");
+			break;
+		
+		/* the space can be escaped to %20 or a plus
+		 * sign. we're going with the generic escape
+		 * for now. the plus thing is more commonly seen
+		 * when building GET strings */
+#if 0
+		case ' ':
+			bufputc(ob, '+');
+			break;
+#endif
+
+		/* every other character goes with a %XX escaping */
+		default:
+			hex_str[1] = hex_chars[(src[i] >> 4) & 0xF];
+			hex_str[2] = hex_chars[src[i] & 0xF];
+			bufput(ob, hex_str, 3);
+		}
+
+		i++;
+	}
+}

src/rt/sundown/html/houdini_html_e.c

@@ -0,0 +1,84 @@
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "houdini.h"
+
+#define ESCAPE_GROW_FACTOR(x) (((x) * 12) / 10) /* this is very scientific, yes */
+
+/**
+ * According to the OWASP rules:
+ *
+ * & --> &amp;
+ * < --> &lt;
+ * > --> &gt;
+ * " --> &quot;
+ * ' --> &#x27;     &apos; is not recommended
+ * / --> &#x2F;     forward slash is included as it helps end an HTML entity
+ *
+ */
+static const char HTML_ESCAPE_TABLE[] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 1, 0, 0, 0, 2, 3, 0, 0, 0, 0, 0, 0, 0, 4, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 6, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static const char *HTML_ESCAPES[] = {
+        "",
+        "&quot;",
+        "&amp;",
+        "&#39;",
+        "&#47;",
+        "&lt;",
+        "&gt;"
+};
+
+void
+houdini_escape_html0(struct buf *ob, const uint8_t *src, size_t size, int secure)
+{
+	size_t i = 0, org, esc = 0;
+
+	bufgrow(ob, ESCAPE_GROW_FACTOR(size));
+
+	while (i < size) {
+		org = i;
+		while (i < size && (esc = HTML_ESCAPE_TABLE[src[i]]) == 0)
+			i++;
+
+		if (i > org)
+			bufput(ob, src + org, i - org);
+
+		/* escaping */
+		if (i >= size)
+			break;
+
+		/* The forward slash is only escaped in secure mode */
+		if (src[i] == '/' && !secure) {
+			bufputc(ob, '/');
+		} else {
+			bufputs(ob, HTML_ESCAPES[esc]);
+		}
+
+		i++;
+	}
+}
+
+void
+houdini_escape_html(struct buf *ob, const uint8_t *src, size_t size)
+{
+	houdini_escape_html0(ob, src, size, 1);
+}
+

src/rt/sundown/html/html.c

@@ -0,0 +1,635 @@
+/*
+ * Copyright (c) 2009, Natacha Porté
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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 "markdown.h"
+#include "html.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#include "houdini.h"
+
+#define USE_XHTML(opt) (opt->flags & HTML_USE_XHTML)
+
+int
+sdhtml_is_tag(const uint8_t *tag_data, size_t tag_size, const char *tagname)
+{
+	size_t i;
+	int closed = 0;
+
+	if (tag_size < 3 || tag_data[0] != '<')
+		return HTML_TAG_NONE;
+
+	i = 1;
+
+	if (tag_data[i] == '/') {
+		closed = 1;
+		i++;
+	}
+
+	for (; i < tag_size; ++i, ++tagname) {
+		if (*tagname == 0)
+			break;
+
+		if (tag_data[i] != *tagname)
+			return HTML_TAG_NONE;
+	}
+
+	if (i == tag_size)
+		return HTML_TAG_NONE;
+
+	if (isspace(tag_data[i]) || tag_data[i] == '>')
+		return closed ? HTML_TAG_CLOSE : HTML_TAG_OPEN;
+
+	return HTML_TAG_NONE;
+}
+
+static inline void escape_html(struct buf *ob, const uint8_t *source, size_t length)
+{
+	houdini_escape_html0(ob, source, length, 0);
+}
+
+static inline void escape_href(struct buf *ob, const uint8_t *source, size_t length)
+{
+	houdini_escape_href(ob, source, length);
+}
+
+/********************
+ * GENERIC RENDERER *
+ ********************/
+static int
+rndr_autolink(struct buf *ob, const struct buf *link, enum mkd_autolink type, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	if (!link || !link->size)
+		return 0;
+
+	if ((options->flags & HTML_SAFELINK) != 0 &&
+		!sd_autolink_issafe(link->data, link->size) &&
+		type != MKDA_EMAIL)
+		return 0;
+
+	BUFPUTSL(ob, "<a href=\"");
+	if (type == MKDA_EMAIL)
+		BUFPUTSL(ob, "mailto:");
+	escape_href(ob, link->data, link->size);
+
+	if (options->link_attributes) {
+		bufputc(ob, '\"');
+		options->link_attributes(ob, link, opaque);
+		bufputc(ob, '>');
+	} else {
+		BUFPUTSL(ob, "\">");
+	}
+
+	/*
+	 * Pretty printing: if we get an email address as
+	 * an actual URI, e.g. `mailto:foo@bar.com`, we don't
+	 * want to print the `mailto:` prefix
+	 */
+	if (bufprefix(link, "mailto:") == 0) {
+		escape_html(ob, link->data + 7, link->size - 7);
+	} else {
+		escape_html(ob, link->data, link->size);
+	}
+
+	BUFPUTSL(ob, "</a>");
+
+	return 1;
+}
+
+static void
+rndr_blockcode(struct buf *ob, const struct buf *text, const struct buf *lang, void *opaque)
+{
+	if (ob->size) bufputc(ob, '\n');
+
+	if (lang && lang->size) {
+		size_t i, cls;
+		BUFPUTSL(ob, "<pre><code class=\"");
+
+		for (i = 0, cls = 0; i < lang->size; ++i, ++cls) {
+			while (i < lang->size && isspace(lang->data[i]))
+				i++;
+
+			if (i < lang->size) {
+				size_t org = i;
+				while (i < lang->size && !isspace(lang->data[i]))
+					i++;
+
+				if (lang->data[org] == '.')
+					org++;
+
+				if (cls) bufputc(ob, ' ');
+				escape_html(ob, lang->data + org, i - org);
+			}
+		}
+
+		BUFPUTSL(ob, "\">");
+	} else
+		BUFPUTSL(ob, "<pre><code>");
+
+	if (text)
+		escape_html(ob, text->data, text->size);
+
+	BUFPUTSL(ob, "</code></pre>\n");
+}
+
+static void
+rndr_blockquote(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (ob->size) bufputc(ob, '\n');
+	BUFPUTSL(ob, "<blockquote>\n");
+	if (text) bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</blockquote>\n");
+}
+
+static int
+rndr_codespan(struct buf *ob, const struct buf *text, void *opaque)
+{
+	BUFPUTSL(ob, "<code>");
+	if (text) escape_html(ob, text->data, text->size);
+	BUFPUTSL(ob, "</code>");
+	return 1;
+}
+
+static int
+rndr_strikethrough(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (!text || !text->size)
+		return 0;
+
+	BUFPUTSL(ob, "<del>");
+	bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</del>");
+	return 1;
+}
+
+static int
+rndr_double_emphasis(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (!text || !text->size)
+		return 0;
+
+	BUFPUTSL(ob, "<strong>");
+	bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</strong>");
+
+	return 1;
+}
+
+static int
+rndr_emphasis(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (!text || !text->size) return 0;
+	BUFPUTSL(ob, "<em>");
+	if (text) bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</em>");
+	return 1;
+}
+
+static int
+rndr_linebreak(struct buf *ob, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+	bufputs(ob, USE_XHTML(options) ? "<br/>\n" : "<br>\n");
+	return 1;
+}
+
+static void
+rndr_header(struct buf *ob, const struct buf *text, int level, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	if (ob->size)
+		bufputc(ob, '\n');
+
+	if (options->flags & HTML_TOC)
+		bufprintf(ob, "<h%d id=\"toc_%d\">", level, options->toc_data.header_count++);
+	else
+		bufprintf(ob, "<h%d>", level);
+
+	if (text) bufput(ob, text->data, text->size);
+	bufprintf(ob, "</h%d>\n", level);
+}
+
+static int
+rndr_link(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *content, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	if (link != NULL && (options->flags & HTML_SAFELINK) != 0 && !sd_autolink_issafe(link->data, link->size))
+		return 0;
+
+	BUFPUTSL(ob, "<a href=\"");
+
+	if (link && link->size)
+		escape_href(ob, link->data, link->size);
+
+	if (title && title->size) {
+		BUFPUTSL(ob, "\" title=\"");
+		escape_html(ob, title->data, title->size);
+	}
+
+	if (options->link_attributes) {
+		bufputc(ob, '\"');
+		options->link_attributes(ob, link, opaque);
+		bufputc(ob, '>');
+	} else {
+		BUFPUTSL(ob, "\">");
+	}
+
+	if (content && content->size) bufput(ob, content->data, content->size);
+	BUFPUTSL(ob, "</a>");
+	return 1;
+}
+
+static void
+rndr_list(struct buf *ob, const struct buf *text, int flags, void *opaque)
+{
+	if (ob->size) bufputc(ob, '\n');
+	bufput(ob, flags & MKD_LIST_ORDERED ? "<ol>\n" : "<ul>\n", 5);
+	if (text) bufput(ob, text->data, text->size);
+	bufput(ob, flags & MKD_LIST_ORDERED ? "</ol>\n" : "</ul>\n", 6);
+}
+
+static void
+rndr_listitem(struct buf *ob, const struct buf *text, int flags, void *opaque)
+{
+	BUFPUTSL(ob, "<li>");
+	if (text) {
+		size_t size = text->size;
+		while (size && text->data[size - 1] == '\n')
+			size--;
+
+		bufput(ob, text->data, size);
+	}
+	BUFPUTSL(ob, "</li>\n");
+}
+
+static void
+rndr_paragraph(struct buf *ob, const struct buf *text, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+	size_t i = 0;
+
+	if (ob->size) bufputc(ob, '\n');
+
+	if (!text || !text->size)
+		return;
+
+	while (i < text->size && isspace(text->data[i])) i++;
+
+	if (i == text->size)
+		return;
+
+	BUFPUTSL(ob, "<p>");
+	if (options->flags & HTML_HARD_WRAP) {
+		size_t org;
+		while (i < text->size) {
+			org = i;
+			while (i < text->size && text->data[i] != '\n')
+				i++;
+
+			if (i > org)
+				bufput(ob, text->data + org, i - org);
+
+			/*
+			 * do not insert a line break if this newline
+			 * is the last character on the paragraph
+			 */
+			if (i >= text->size - 1)
+				break;
+
+			rndr_linebreak(ob, opaque);
+			i++;
+		}
+	} else {
+		bufput(ob, &text->data[i], text->size - i);
+	}
+	BUFPUTSL(ob, "</p>\n");
+}
+
+static void
+rndr_raw_block(struct buf *ob, const struct buf *text, void *opaque)
+{
+	size_t org, sz;
+	if (!text) return;
+	sz = text->size;
+	while (sz > 0 && text->data[sz - 1] == '\n') sz--;
+	org = 0;
+	while (org < sz && text->data[org] == '\n') org++;
+	if (org >= sz) return;
+	if (ob->size) bufputc(ob, '\n');
+	bufput(ob, text->data + org, sz - org);
+	bufputc(ob, '\n');
+}
+
+static int
+rndr_triple_emphasis(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (!text || !text->size) return 0;
+	BUFPUTSL(ob, "<strong><em>");
+	bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</em></strong>");
+	return 1;
+}
+
+static void
+rndr_hrule(struct buf *ob, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+	if (ob->size) bufputc(ob, '\n');
+	bufputs(ob, USE_XHTML(options) ? "<hr/>\n" : "<hr>\n");
+}
+
+static int
+rndr_image(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *alt, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+	if (!link || !link->size) return 0;
+
+	BUFPUTSL(ob, "<img src=\"");
+	escape_href(ob, link->data, link->size);
+	BUFPUTSL(ob, "\" alt=\"");
+
+	if (alt && alt->size)
+		escape_html(ob, alt->data, alt->size);
+
+	if (title && title->size) {
+		BUFPUTSL(ob, "\" title=\"");
+		escape_html(ob, title->data, title->size); }
+
+	bufputs(ob, USE_XHTML(options) ? "\"/>" : "\">");
+	return 1;
+}
+
+static int
+rndr_raw_html(struct buf *ob, const struct buf *text, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	/* HTML_ESCAPE overrides SKIP_HTML, SKIP_STYLE, SKIP_LINKS and SKIP_IMAGES
+	* It doens't see if there are any valid tags, just escape all of them. */
+	if((options->flags & HTML_ESCAPE) != 0) {
+		escape_html(ob, text->data, text->size);
+		return 1;
+	}
+
+	if ((options->flags & HTML_SKIP_HTML) != 0)
+		return 1;
+
+	if ((options->flags & HTML_SKIP_STYLE) != 0 &&
+		sdhtml_is_tag(text->data, text->size, "style"))
+		return 1;
+
+	if ((options->flags & HTML_SKIP_LINKS) != 0 &&
+		sdhtml_is_tag(text->data, text->size, "a"))
+		return 1;
+
+	if ((options->flags & HTML_SKIP_IMAGES) != 0 &&
+		sdhtml_is_tag(text->data, text->size, "img"))
+		return 1;
+
+	bufput(ob, text->data, text->size);
+	return 1;
+}
+
+static void
+rndr_table(struct buf *ob, const struct buf *header, const struct buf *body, void *opaque)
+{
+	if (ob->size) bufputc(ob, '\n');
+	BUFPUTSL(ob, "<table><thead>\n");
+	if (header)
+		bufput(ob, header->data, header->size);
+	BUFPUTSL(ob, "</thead><tbody>\n");
+	if (body)
+		bufput(ob, body->data, body->size);
+	BUFPUTSL(ob, "</tbody></table>\n");
+}
+
+static void
+rndr_tablerow(struct buf *ob, const struct buf *text, void *opaque)
+{
+	BUFPUTSL(ob, "<tr>\n");
+	if (text)
+		bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</tr>\n");
+}
+
+static void
+rndr_tablecell(struct buf *ob, const struct buf *text, int flags, void *opaque)
+{
+	if (flags & MKD_TABLE_HEADER) {
+		BUFPUTSL(ob, "<th");
+	} else {
+		BUFPUTSL(ob, "<td");
+	}
+
+	switch (flags & MKD_TABLE_ALIGNMASK) {
+	case MKD_TABLE_ALIGN_CENTER:
+		BUFPUTSL(ob, " align=\"center\">");
+		break;
+
+	case MKD_TABLE_ALIGN_L:
+		BUFPUTSL(ob, " align=\"left\">");
+		break;
+
+	case MKD_TABLE_ALIGN_R:
+		BUFPUTSL(ob, " align=\"right\">");
+		break;
+
+	default:
+		BUFPUTSL(ob, ">");
+	}
+
+	if (text)
+		bufput(ob, text->data, text->size);
+
+	if (flags & MKD_TABLE_HEADER) {
+		BUFPUTSL(ob, "</th>\n");
+	} else {
+		BUFPUTSL(ob, "</td>\n");
+	}
+}
+
+static int
+rndr_superscript(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (!text || !text->size) return 0;
+	BUFPUTSL(ob, "<sup>");
+	bufput(ob, text->data, text->size);
+	BUFPUTSL(ob, "</sup>");
+	return 1;
+}
+
+static void
+rndr_normal_text(struct buf *ob, const struct buf *text, void *opaque)
+{
+	if (text)
+		escape_html(ob, text->data, text->size);
+}
+
+static void
+toc_header(struct buf *ob, const struct buf *text, int level, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	/* set the level offset if this is the first header
+	 * we're parsing for the document */
+	if (options->toc_data.current_level == 0) {
+		options->toc_data.level_offset = level - 1;
+	}
+	level -= options->toc_data.level_offset;
+
+	if (level > options->toc_data.current_level) {
+		while (level > options->toc_data.current_level) {
+			BUFPUTSL(ob, "<ul>\n<li>\n");
+			options->toc_data.current_level++;
+		}
+	} else if (level < options->toc_data.current_level) {
+		BUFPUTSL(ob, "</li>\n");
+		while (level < options->toc_data.current_level) {
+			BUFPUTSL(ob, "</ul>\n</li>\n");
+			options->toc_data.current_level--;
+		}
+		BUFPUTSL(ob,"<li>\n");
+	} else {
+		BUFPUTSL(ob,"</li>\n<li>\n");
+	}
+
+	bufprintf(ob, "<a href=\"#toc_%d\">", options->toc_data.header_count++);
+	if (text)
+		escape_html(ob, text->data, text->size);
+	BUFPUTSL(ob, "</a>\n");
+}
+
+static int
+toc_link(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *content, void *opaque)
+{
+	if (content && content->size)
+		bufput(ob, content->data, content->size);
+	return 1;
+}
+
+static void
+toc_finalize(struct buf *ob, void *opaque)
+{
+	struct html_renderopt *options = opaque;
+
+	while (options->toc_data.current_level > 0) {
+		BUFPUTSL(ob, "</li>\n</ul>\n");
+		options->toc_data.current_level--;
+	}
+}
+
+void
+sdhtml_toc_renderer(struct sd_callbacks *callbacks, struct html_renderopt *options)
+{
+	static const struct sd_callbacks cb_default = {
+		NULL,
+		NULL,
+		NULL,
+		toc_header,
+		NULL,
+		NULL,
+		NULL,
+		NULL,
+		NULL,
+		NULL,
+		NULL,
+
+		NULL,
+		rndr_codespan,
+		rndr_double_emphasis,
+		rndr_emphasis,
+		NULL,
+		NULL,
+		toc_link,
+		NULL,
+		rndr_triple_emphasis,
+		rndr_strikethrough,
+		rndr_superscript,
+
+		NULL,
+		NULL,
+
+		NULL,
+		toc_finalize,
+	};
+
+	memset(options, 0x0, sizeof(struct html_renderopt));
+	options->flags = HTML_TOC;
+
+	memcpy(callbacks, &cb_default, sizeof(struct sd_callbacks));
+}
+
+void
+sdhtml_renderer(struct sd_callbacks *callbacks, struct html_renderopt *options, unsigned int render_flags)
+{
+	static const struct sd_callbacks cb_default = {
+		rndr_blockcode,
+		rndr_blockquote,
+		rndr_raw_block,
+		rndr_header,
+		rndr_hrule,
+		rndr_list,
+		rndr_listitem,
+		rndr_paragraph,
+		rndr_table,
+		rndr_tablerow,
+		rndr_tablecell,
+
+		rndr_autolink,
+		rndr_codespan,
+		rndr_double_emphasis,
+		rndr_emphasis,
+		rndr_image,
+		rndr_linebreak,
+		rndr_link,
+		rndr_raw_html,
+		rndr_triple_emphasis,
+		rndr_strikethrough,
+		rndr_superscript,
+
+		NULL,
+		rndr_normal_text,
+
+		NULL,
+		NULL,
+	};
+
+	/* Prepare the options pointer */
+	memset(options, 0x0, sizeof(struct html_renderopt));
+	options->flags = render_flags;
+
+	/* Prepare the callbacks */
+	memcpy(callbacks, &cb_default, sizeof(struct sd_callbacks));
+
+	if (render_flags & HTML_SKIP_IMAGES)
+		callbacks->image = NULL;
+
+	if (render_flags & HTML_SKIP_LINKS) {
+		callbacks->link = NULL;
+		callbacks->autolink = NULL;
+	}
+
+	if (render_flags & HTML_SKIP_HTML || render_flags & HTML_ESCAPE)
+		callbacks->blockhtml = NULL;
+}

src/rt/sundown/html/html.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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.
+ */
+
+#ifndef UPSKIRT_HTML_H
+#define UPSKIRT_HTML_H
+
+#include "markdown.h"
+#include "buffer.h"
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct html_renderopt {
+	struct {
+		int header_count;
+		int current_level;
+		int level_offset;
+	} toc_data;
+
+	unsigned int flags;
+
+	/* extra callbacks */
+	void (*link_attributes)(struct buf *ob, const struct buf *url, void *self);
+};
+
+typedef enum {
+	HTML_SKIP_HTML = (1 << 0),
+	HTML_SKIP_STYLE = (1 << 1),
+	HTML_SKIP_IMAGES = (1 << 2),
+	HTML_SKIP_LINKS = (1 << 3),
+	HTML_EXPAND_TABS = (1 << 4),
+	HTML_SAFELINK = (1 << 5),
+	HTML_TOC = (1 << 6),
+	HTML_HARD_WRAP = (1 << 7),
+	HTML_USE_XHTML = (1 << 8),
+	HTML_ESCAPE = (1 << 9),
+} html_render_mode;
+
+typedef enum {
+	HTML_TAG_NONE = 0,
+	HTML_TAG_OPEN,
+	HTML_TAG_CLOSE,
+} html_tag;
+
+int
+sdhtml_is_tag(const uint8_t *tag_data, size_t tag_size, const char *tagname);
+
+extern void
+sdhtml_renderer(struct sd_callbacks *callbacks, struct html_renderopt *options_ptr, unsigned int render_flags);
+
+extern void
+sdhtml_toc_renderer(struct sd_callbacks *callbacks, struct html_renderopt *options_ptr);
+
+extern void
+sdhtml_smartypants(struct buf *ob, const uint8_t *text, size_t size);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

src/rt/sundown/html/html_smartypants.c

@@ -0,0 +1,389 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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 "buffer.h"
+#include "html.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#if defined(_WIN32)
+#define snprintf	_snprintf		
+#endif
+
+struct smartypants_data {
+	int in_squote;
+	int in_dquote;
+};
+
+static size_t smartypants_cb__ltag(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__dquote(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__amp(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__period(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__number(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__dash(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__parens(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__squote(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__backtick(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+static size_t smartypants_cb__escape(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size);
+
+static size_t (*smartypants_cb_ptrs[])
+	(struct buf *, struct smartypants_data *, uint8_t, const uint8_t *, size_t) =
+{
+	NULL,					/* 0 */
+	smartypants_cb__dash,	/* 1 */
+	smartypants_cb__parens,	/* 2 */
+	smartypants_cb__squote, /* 3 */
+	smartypants_cb__dquote, /* 4 */
+	smartypants_cb__amp,	/* 5 */
+	smartypants_cb__period,	/* 6 */
+	smartypants_cb__number,	/* 7 */
+	smartypants_cb__ltag,	/* 8 */
+	smartypants_cb__backtick, /* 9 */
+	smartypants_cb__escape, /* 10 */
+};
+
+static const uint8_t smartypants_cb_chars[] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 4, 0, 0, 0, 5, 3, 2, 0, 0, 0, 0, 1, 6, 0,
+	0, 7, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 0, 0, 0,
+	9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+};
+
+static inline int
+word_boundary(uint8_t c)
+{
+	return c == 0 || isspace(c) || ispunct(c);
+}
+
+static int
+smartypants_quotes(struct buf *ob, uint8_t previous_char, uint8_t next_char, uint8_t quote, int *is_open)
+{
+	char ent[8];
+
+	if (*is_open && !word_boundary(next_char))
+		return 0;
+
+	if (!(*is_open) && !word_boundary(previous_char))
+		return 0;
+
+	snprintf(ent, sizeof(ent), "&%c%cquo;", (*is_open) ? 'r' : 'l', quote);
+	*is_open = !(*is_open);
+	bufputs(ob, ent);
+	return 1;
+}
+
+static size_t
+smartypants_cb__squote(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 2) {
+		uint8_t t1 = tolower(text[1]);
+
+		if (t1 == '\'') {
+			if (smartypants_quotes(ob, previous_char, size >= 3 ? text[2] : 0, 'd', &smrt->in_dquote))
+				return 1;
+		}
+
+		if ((t1 == 's' || t1 == 't' || t1 == 'm' || t1 == 'd') &&
+			(size == 3 || word_boundary(text[2]))) {
+			BUFPUTSL(ob, "&rsquo;");
+			return 0;
+		}
+
+		if (size >= 3) {
+			uint8_t t2 = tolower(text[2]);
+
+			if (((t1 == 'r' && t2 == 'e') ||
+				(t1 == 'l' && t2 == 'l') ||
+				(t1 == 'v' && t2 == 'e')) &&
+				(size == 4 || word_boundary(text[3]))) {
+				BUFPUTSL(ob, "&rsquo;");
+				return 0;
+			}
+		}
+	}
+
+	if (smartypants_quotes(ob, previous_char, size > 0 ? text[1] : 0, 's', &smrt->in_squote))
+		return 0;
+
+	bufputc(ob, text[0]);
+	return 0;
+}
+
+static size_t
+smartypants_cb__parens(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 3) {
+		uint8_t t1 = tolower(text[1]);
+		uint8_t t2 = tolower(text[2]);
+
+		if (t1 == 'c' && t2 == ')') {
+			BUFPUTSL(ob, "&copy;");
+			return 2;
+		}
+
+		if (t1 == 'r' && t2 == ')') {
+			BUFPUTSL(ob, "&reg;");
+			return 2;
+		}
+
+		if (size >= 4 && t1 == 't' && t2 == 'm' && text[3] == ')') {
+			BUFPUTSL(ob, "&trade;");
+			return 3;
+		}
+	}
+
+	bufputc(ob, text[0]);
+	return 0;
+}
+
+static size_t
+smartypants_cb__dash(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 3 && text[1] == '-' && text[2] == '-') {
+		BUFPUTSL(ob, "&mdash;");
+		return 2;
+	}
+
+	if (size >= 2 && text[1] == '-') {
+		BUFPUTSL(ob, "&ndash;");
+		return 1;
+	}
+
+	bufputc(ob, text[0]);
+	return 0;
+}
+
+static size_t
+smartypants_cb__amp(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 6 && memcmp(text, "&quot;", 6) == 0) {
+		if (smartypants_quotes(ob, previous_char, size >= 7 ? text[6] : 0, 'd', &smrt->in_dquote))
+			return 5;
+	}
+
+	if (size >= 4 && memcmp(text, "&#0;", 4) == 0)
+		return 3;
+
+	bufputc(ob, '&');
+	return 0;
+}
+
+static size_t
+smartypants_cb__period(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 3 && text[1] == '.' && text[2] == '.') {
+		BUFPUTSL(ob, "&hellip;");
+		return 2;
+	}
+
+	if (size >= 5 && text[1] == ' ' && text[2] == '.' && text[3] == ' ' && text[4] == '.') {
+		BUFPUTSL(ob, "&hellip;");
+		return 4;
+	}
+
+	bufputc(ob, text[0]);
+	return 0;
+}
+
+static size_t
+smartypants_cb__backtick(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size >= 2 && text[1] == '`') {
+		if (smartypants_quotes(ob, previous_char, size >= 3 ? text[2] : 0, 'd', &smrt->in_dquote))
+			return 1;
+	}
+
+	return 0;
+}
+
+static size_t
+smartypants_cb__number(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (word_boundary(previous_char) && size >= 3) {
+		if (text[0] == '1' && text[1] == '/' && text[2] == '2') {
+			if (size == 3 || word_boundary(text[3])) {
+				BUFPUTSL(ob, "&frac12;");
+				return 2;
+			}
+		}
+
+		if (text[0] == '1' && text[1] == '/' && text[2] == '4') {
+			if (size == 3 || word_boundary(text[3]) ||
+				(size >= 5 && tolower(text[3]) == 't' && tolower(text[4]) == 'h')) {
+				BUFPUTSL(ob, "&frac14;");
+				return 2;
+			}
+		}
+
+		if (text[0] == '3' && text[1] == '/' && text[2] == '4') {
+			if (size == 3 || word_boundary(text[3]) ||
+				(size >= 6 && tolower(text[3]) == 't' && tolower(text[4]) == 'h' && tolower(text[5]) == 's')) {
+				BUFPUTSL(ob, "&frac34;");
+				return 2;
+			}
+		}
+	}
+
+	bufputc(ob, text[0]);
+	return 0;
+}
+
+static size_t
+smartypants_cb__dquote(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (!smartypants_quotes(ob, previous_char, size > 0 ? text[1] : 0, 'd', &smrt->in_dquote))
+		BUFPUTSL(ob, "&quot;");
+
+	return 0;
+}
+
+static size_t
+smartypants_cb__ltag(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	static const char *skip_tags[] = {
+	  "pre", "code", "var", "samp", "kbd", "math", "script", "style"
+	};
+	static const size_t skip_tags_count = 8;
+
+	size_t tag, i = 0;
+
+	while (i < size && text[i] != '>')
+		i++;
+
+	for (tag = 0; tag < skip_tags_count; ++tag) {
+		if (sdhtml_is_tag(text, size, skip_tags[tag]) == HTML_TAG_OPEN)
+			break;
+	}
+
+	if (tag < skip_tags_count) {
+		for (;;) {
+			while (i < size && text[i] != '<')
+				i++;
+
+			if (i == size)
+				break;
+
+			if (sdhtml_is_tag(text + i, size - i, skip_tags[tag]) == HTML_TAG_CLOSE)
+				break;
+
+			i++;
+		}
+
+		while (i < size && text[i] != '>')
+			i++;
+	}
+
+	bufput(ob, text, i + 1);
+	return i;
+}
+
+static size_t
+smartypants_cb__escape(struct buf *ob, struct smartypants_data *smrt, uint8_t previous_char, const uint8_t *text, size_t size)
+{
+	if (size < 2)
+		return 0;
+
+	switch (text[1]) {
+	case '\\':
+	case '"':
+	case '\'':
+	case '.':
+	case '-':
+	case '`':
+		bufputc(ob, text[1]);
+		return 1;
+
+	default:
+		bufputc(ob, '\\');
+		return 0;
+	}
+}
+
+#if 0
+static struct {
+    uint8_t c0;
+    const uint8_t *pattern;
+    const uint8_t *entity;
+    int skip;
+} smartypants_subs[] = {
+    { '\'', "'s>",      "&rsquo;",  0 },
+    { '\'', "'t>",      "&rsquo;",  0 },
+    { '\'', "'re>",     "&rsquo;",  0 },
+    { '\'', "'ll>",     "&rsquo;",  0 },
+    { '\'', "'ve>",     "&rsquo;",  0 },
+    { '\'', "'m>",      "&rsquo;",  0 },
+    { '\'', "'d>",      "&rsquo;",  0 },
+    { '-',  "--",       "&mdash;",  1 },
+    { '-',  "<->",      "&ndash;",  0 },
+    { '.',  "...",      "&hellip;", 2 },
+    { '.',  ". . .",    "&hellip;", 4 },
+    { '(',  "(c)",      "&copy;",   2 },
+    { '(',  "(r)",      "&reg;",    2 },
+    { '(',  "(tm)",     "&trade;",  3 },
+    { '3',  "<3/4>",    "&frac34;", 2 },
+    { '3',  "<3/4ths>", "&frac34;", 2 },
+    { '1',  "<1/2>",    "&frac12;", 2 },
+    { '1',  "<1/4>",    "&frac14;", 2 },
+    { '1',  "<1/4th>",  "&frac14;", 2 },
+    { '&',  "&#0;",      0,       3 },
+};
+#endif
+
+void
+sdhtml_smartypants(struct buf *ob, const uint8_t *text, size_t size)
+{
+	size_t i;
+	struct smartypants_data smrt = {0, 0};
+
+	if (!text)
+		return;
+
+	bufgrow(ob, size);
+
+	for (i = 0; i < size; ++i) {
+		size_t org;
+		uint8_t action = 0;
+
+		org = i;
+		while (i < size && (action = smartypants_cb_chars[text[i]]) == 0)
+			i++;
+
+		if (i > org)
+			bufput(ob, text + org, i - org);
+
+		if (i < size) {
+			i += smartypants_cb_ptrs[(int)action]
+				(ob, &smrt, i ? text[i - 1] : 0, text + i, size - i);
+		}
+	}
+}
+
+

src/rt/sundown/html_block_names.txt

@@ -0,0 +1,25 @@
+##
+p
+dl
+h1
+h2
+h3
+h4
+h5
+h6
+ol
+ul
+del
+div
+ins
+pre
+form
+math
+table
+figure
+iframe
+script
+style
+fieldset
+noscript
+blockquote

src/rt/sundown/src/autolink.c

@@ -0,0 +1,297 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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 "buffer.h"
+#include "autolink.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+#if defined(_WIN32)
+#define strncasecmp	_strnicmp
+#endif
+
+int
+sd_autolink_issafe(const uint8_t *link, size_t link_len)
+{
+	static const size_t valid_uris_count = 5;
+	static const char *valid_uris[] = {
+		"/", "http://", "https://", "ftp://", "mailto:"
+	};
+
+	size_t i;
+
+	for (i = 0; i < valid_uris_count; ++i) {
+		size_t len = strlen(valid_uris[i]);
+
+		if (link_len > len &&
+			strncasecmp((char *)link, valid_uris[i], len) == 0 &&
+			isalnum(link[len]))
+			return 1;
+	}
+
+	return 0;
+}
+
+static size_t
+autolink_delim(uint8_t *data, size_t link_end, size_t max_rewind, size_t size)
+{
+	uint8_t cclose, copen = 0;
+	size_t i;
+
+	for (i = 0; i < link_end; ++i)
+		if (data[i] == '<') {
+			link_end = i;
+			break;
+		}
+
+	while (link_end > 0) {
+		if (strchr("?!.,", data[link_end - 1]) != NULL)
+			link_end--;
+
+		else if (data[link_end - 1] == ';') {
+			size_t new_end = link_end - 2;
+
+			while (new_end > 0 && isalpha(data[new_end]))
+				new_end--;
+
+			if (new_end < link_end - 2 && data[new_end] == '&')
+				link_end = new_end;
+			else
+				link_end--;
+		}
+		else break;
+	}
+
+	if (link_end == 0)
+		return 0;
+
+	cclose = data[link_end - 1];
+
+	switch (cclose) {
+	case '"':	copen = '"'; break;
+	case '\'':	copen = '\''; break;
+	case ')':	copen = '('; break;
+	case ']':	copen = '['; break;
+	case '}':	copen = '{'; break;
+	}
+
+	if (copen != 0) {
+		size_t closing = 0;
+		size_t opening = 0;
+		size_t i = 0;
+
+		/* Try to close the final punctuation sign in this same line;
+		 * if we managed to close it outside of the URL, that means that it's
+		 * not part of the URL. If it closes inside the URL, that means it
+		 * is part of the URL.
+		 *
+		 * Examples:
+		 *
+		 *	foo http://www.pokemon.com/Pikachu_(Electric) bar
+		 *		=> http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *	foo (http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *		=> http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *	foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *		=> http://www.pokemon.com/Pikachu_(Electric))
+		 *
+		 *	(foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *		=> foo http://www.pokemon.com/Pikachu_(Electric)
+		 */
+
+		while (i < link_end) {
+			if (data[i] == copen)
+				opening++;
+			else if (data[i] == cclose)
+				closing++;
+
+			i++;
+		}
+
+		if (closing != opening)
+			link_end--;
+	}
+
+	return link_end;
+}
+
+static size_t
+check_domain(uint8_t *data, size_t size, int allow_short)
+{
+	size_t i, np = 0;
+
+	if (!isalnum(data[0]))
+		return 0;
+
+	for (i = 1; i < size - 1; ++i) {
+		if (data[i] == '.') np++;
+		else if (!isalnum(data[i]) && data[i] != '-') break;
+	}
+
+	if (allow_short) {
+		/* We don't need a valid domain in the strict sense (with
+		 * least one dot; so just make sure it's composed of valid
+		 * domain characters and return the length of the the valid
+		 * sequence. */
+		return i;
+	} else {
+		/* a valid domain needs to have at least a dot.
+		 * that's as far as we get */
+		return np ? i : 0;
+	}
+}
+
+size_t
+sd_autolink__www(
+	size_t *rewind_p,
+	struct buf *link,
+	uint8_t *data,
+	size_t max_rewind,
+	size_t size,
+	unsigned int flags)
+{
+	size_t link_end;
+
+	if (max_rewind > 0 && !ispunct(data[-1]) && !isspace(data[-1]))
+		return 0;
+
+	if (size < 4 || memcmp(data, "www.", strlen("www.")) != 0)
+		return 0;
+
+	link_end = check_domain(data, size, 0);
+
+	if (link_end == 0)
+		return 0;
+
+	while (link_end < size && !isspace(data[link_end]))
+		link_end++;
+
+	link_end = autolink_delim(data, link_end, max_rewind, size);
+
+	if (link_end == 0)
+		return 0;
+
+	bufput(link, data, link_end);
+	*rewind_p = 0;
+
+	return (int)link_end;
+}
+
+size_t
+sd_autolink__email(
+	size_t *rewind_p,
+	struct buf *link,
+	uint8_t *data,
+	size_t max_rewind,
+	size_t size,
+	unsigned int flags)
+{
+	size_t link_end, rewind;
+	int nb = 0, np = 0;
+
+	for (rewind = 0; rewind < max_rewind; ++rewind) {
+		uint8_t c = data[-rewind - 1];
+
+		if (isalnum(c))
+			continue;
+
+		if (strchr(".+-_", c) != NULL)
+			continue;
+
+		break;
+	}
+
+	if (rewind == 0)
+		return 0;
+
+	for (link_end = 0; link_end < size; ++link_end) {
+		uint8_t c = data[link_end];
+
+		if (isalnum(c))
+			continue;
+
+		if (c == '@')
+			nb++;
+		else if (c == '.' && link_end < size - 1)
+			np++;
+		else if (c != '-' && c != '_')
+			break;
+	}
+
+	if (link_end < 2 || nb != 1 || np == 0 ||
+		!isalpha(data[link_end - 1]))
+		return 0;
+
+	link_end = autolink_delim(data, link_end, max_rewind, size);
+
+	if (link_end == 0)
+		return 0;
+
+	bufput(link, data - rewind, link_end + rewind);
+	*rewind_p = rewind;
+
+	return link_end;
+}
+
+size_t
+sd_autolink__url(
+	size_t *rewind_p,
+	struct buf *link,
+	uint8_t *data,
+	size_t max_rewind,
+	size_t size,
+	unsigned int flags)
+{
+	size_t link_end, rewind = 0, domain_len;
+
+	if (size < 4 || data[1] != '/' || data[2] != '/')
+		return 0;
+
+	while (rewind < max_rewind && isalpha(data[-rewind - 1]))
+		rewind++;
+
+	if (!sd_autolink_issafe(data - rewind, size + rewind))
+		return 0;
+
+	link_end = strlen("://");
+
+	domain_len = check_domain(
+		data + link_end,
+		size - link_end,
+		flags & SD_AUTOLINK_SHORT_DOMAINS);
+
+	if (domain_len == 0)
+		return 0;
+
+	link_end += domain_len;
+	while (link_end < size && !isspace(data[link_end]))
+		link_end++;
+
+	link_end = autolink_delim(data, link_end, max_rewind, size);
+
+	if (link_end == 0)
+		return 0;
+
+	bufput(link, data - rewind, link_end + rewind);
+	*rewind_p = rewind;
+
+	return link_end;
+}
+

src/rt/sundown/src/autolink.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2011, Vicent Marti
+ *
+ * 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.
+ */
+
+#ifndef UPSKIRT_AUTOLINK_H
+#define UPSKIRT_AUTOLINK_H
+
+#include "buffer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum {
+	SD_AUTOLINK_SHORT_DOMAINS = (1 << 0),
+};
+
+int
+sd_autolink_issafe(const uint8_t *link, size_t link_len);
+
+size_t
+sd_autolink__www(size_t *rewind_p, struct buf *link,
+	uint8_t *data, size_t offset, size_t size, unsigned int flags);
+
+size_t
+sd_autolink__email(size_t *rewind_p, struct buf *link,
+	uint8_t *data, size_t offset, size_t size, unsigned int flags);
+
+size_t
+sd_autolink__url(size_t *rewind_p, struct buf *link,
+	uint8_t *data, size_t offset, size_t size, unsigned int flags);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+/* vim: set filetype=c: */

src/rt/sundown/src/buffer.c

@@ -0,0 +1,225 @@
+/*
+ * Copyright (c) 2008, Natacha Porté
+ * Copyright (c) 2011, Vicent Martí
+ *
+ * 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.
+ */
+
+#define BUFFER_MAX_ALLOC_SIZE (1024 * 1024 * 16) //16mb
+
+#include "buffer.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+/* MSVC compat */
+#if defined(_MSC_VER)
+#	define _buf_vsnprintf _vsnprintf
+#else
+#	define _buf_vsnprintf vsnprintf
+#endif
+
+int
+bufprefix(const struct buf *buf, const char *prefix)
+{
+	size_t i;
+	assert(buf && buf->unit);
+
+	for (i = 0; i < buf->size; ++i) {
+		if (prefix[i] == 0)
+			return 0;
+
+		if (buf->data[i] != prefix[i])
+			return buf->data[i] - prefix[i];
+	}
+
+	return 0;
+}
+
+/* bufgrow: increasing the allocated size to the given value */
+int
+bufgrow(struct buf *buf, size_t neosz)
+{
+	size_t neoasz;
+	void *neodata;
+
+	assert(buf && buf->unit);
+
+	if (neosz > BUFFER_MAX_ALLOC_SIZE)
+		return BUF_ENOMEM;
+
+	if (buf->asize >= neosz)
+		return BUF_OK;
+
+	neoasz = buf->asize + buf->unit;
+	while (neoasz < neosz)
+		neoasz += buf->unit;
+
+	neodata = realloc(buf->data, neoasz);
+	if (!neodata)
+		return BUF_ENOMEM;
+
+	buf->data = neodata;
+	buf->asize = neoasz;
+	return BUF_OK;
+}
+
+
+/* bufnew: allocation of a new buffer */
+struct buf *
+bufnew(size_t unit)
+{
+	struct buf *ret;
+	ret = malloc(sizeof (struct buf));
+
+	if (ret) {
+		ret->data = 0;
+		ret->size = ret->asize = 0;
+		ret->unit = unit;
+	}
+	return ret;
+}
+
+/* bufnullterm: NULL-termination of the string array */
+const char *
+bufcstr(struct buf *buf)
+{
+	assert(buf && buf->unit);
+
+	if (buf->size < buf->asize && buf->data[buf->size] == 0)
+		return (char *)buf->data;
+
+	if (buf->size + 1 <= buf->asize || bufgrow(buf, buf->size + 1) == 0) {
+		buf->data[buf->size] = 0;
+		return (char *)buf->data;
+	}
+
+	return NULL;
+}
+
+/* bufprintf: formatted printing to a buffer */
+void
+bufprintf(struct buf *buf, const char *fmt, ...)
+{
+	va_list ap;
+	int n;
+
+	assert(buf && buf->unit);
+
+	if (buf->size >= buf->asize && bufgrow(buf, buf->size + 1) < 0)
+		return;
+	
+	va_start(ap, fmt);
+	n = _buf_vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
+	va_end(ap);
+
+	if (n < 0) {
+#ifdef _MSC_VER
+		va_start(ap, fmt);
+		n = _vscprintf(fmt, ap);
+		va_end(ap);
+#else
+		return;
+#endif
+	}
+
+	if ((size_t)n >= buf->asize - buf->size) {
+		if (bufgrow(buf, buf->size + n + 1) < 0)
+			return;
+
+		va_start(ap, fmt);
+		n = _buf_vsnprintf((char *)buf->data + buf->size, buf->asize - buf->size, fmt, ap);
+		va_end(ap);
+	}
+
+	if (n < 0)
+		return;
+
+	buf->size += n;
+}
+
+/* bufput: appends raw data to a buffer */
+void
+bufput(struct buf *buf, const void *data, size_t len)
+{
+	assert(buf && buf->unit);
+
+	if (buf->size + len > buf->asize && bufgrow(buf, buf->size + len) < 0)
+		return;
+
+	memcpy(buf->data + buf->size, data, len);
+	buf->size += len;
+}
+
+/* bufputs: appends a NUL-terminated string to a buffer */
+void
+bufputs(struct buf *buf, const char *str)
+{
+	bufput(buf, str, strlen(str));
+}
+
+
+/* bufputc: appends a single uint8_t to a buffer */
+void
+bufputc(struct buf *buf, int c)
+{
+	assert(buf && buf->unit);
+
+	if (buf->size + 1 > buf->asize && bufgrow(buf, buf->size + 1) < 0)
+		return;
+
+	buf->data[buf->size] = c;
+	buf->size += 1;
+}
+
+/* bufrelease: decrease the reference count and free the buffer if needed */
+void
+bufrelease(struct buf *buf)
+{
+	if (!buf)
+		return;
+
+	free(buf->data);
+	free(buf);
+}
+
+
+/* bufreset: frees internal data of the buffer */
+void
+bufreset(struct buf *buf)
+{
+	if (!buf)
+		return;
+
+	free(buf->data);
+	buf->data = NULL;
+	buf->size = buf->asize = 0;
+}
+
+/* bufslurp: removes a given number of bytes from the head of the array */
+void
+bufslurp(struct buf *buf, size_t len)
+{
+	assert(buf && buf->unit);
+
+	if (len >= buf->size) {
+		buf->size = 0;
+		return;
+	}
+
+	buf->size -= len;
+	memmove(buf->data, buf->data + len, buf->size);
+}
+

src/rt/sundown/src/buffer.h

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2008, Natacha Porté
+ * Copyright (c) 2011, Vicent Martí
+ *
+ * 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.
+ */
+
+#ifndef BUFFER_H__
+#define BUFFER_H__
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(_MSC_VER)
+#define __attribute__(x)
+#define inline
+#endif
+
+typedef enum {
+	BUF_OK = 0,
+	BUF_ENOMEM = -1,
+} buferror_t;
+
+/* struct buf: character array buffer */
+struct buf {
+	uint8_t *data;		/* actual character data */
+	size_t size;	/* size of the string */
+	size_t asize;	/* allocated size (0 = volatile buffer) */
+	size_t unit;	/* reallocation unit size (0 = read-only buffer) */
+};
+
+/* CONST_BUF: global buffer from a string litteral */
+#define BUF_STATIC(string) \
+	{ (uint8_t *)string, sizeof string -1, sizeof string, 0, 0 }
+
+/* VOLATILE_BUF: macro for creating a volatile buffer on the stack */
+#define BUF_VOLATILE(strname) \
+	{ (uint8_t *)strname, strlen(strname), 0, 0, 0 }
+
+/* BUFPUTSL: optimized bufputs of a string litteral */
+#define BUFPUTSL(output, literal) \
+	bufput(output, literal, sizeof literal - 1)
+
+/* bufgrow: increasing the allocated size to the given value */
+int bufgrow(struct buf *, size_t);
+
+/* bufnew: allocation of a new buffer */
+struct buf *bufnew(size_t) __attribute__ ((malloc));
+
+/* bufnullterm: NUL-termination of the string array (making a C-string) */
+const char *bufcstr(struct buf *);
+
+/* bufprefix: compare the beginning of a buffer with a string */
+int bufprefix(const struct buf *buf, const char *prefix);
+
+/* bufput: appends raw data to a buffer */
+void bufput(struct buf *, const void *, size_t);
+
+/* bufputs: appends a NUL-terminated string to a buffer */
+void bufputs(struct buf *, const char *);
+
+/* bufputc: appends a single char to a buffer */
+void bufputc(struct buf *, int);
+
+/* bufrelease: decrease the reference count and free the buffer if needed */
+void bufrelease(struct buf *);
+
+/* bufreset: frees internal data of the buffer */
+void bufreset(struct buf *);
+
+/* bufslurp: removes a given number of bytes from the head of the array */
+void bufslurp(struct buf *, size_t);
+
+/* bufprintf: formatted printing to a buffer */
+void bufprintf(struct buf *, const char *, ...) __attribute__ ((format (printf, 2, 3)));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/rt/sundown/src/html_blocks.h

@@ -0,0 +1,206 @@
+/* C code produced by gperf version 3.0.3 */
+/* Command-line: gperf -N find_block_tag -H hash_block_tag -C -c -E --ignore-case html_block_names.txt  */
+/* Computed positions: -k'1-2' */
+
+#if !((' ' == 32) && ('!' == 33) && ('"' == 34) && ('#' == 35) \
+      && ('%' == 37) && ('&' == 38) && ('\'' == 39) && ('(' == 40) \
+      && (')' == 41) && ('*' == 42) && ('+' == 43) && (',' == 44) \
+      && ('-' == 45) && ('.' == 46) && ('/' == 47) && ('0' == 48) \
+      && ('1' == 49) && ('2' == 50) && ('3' == 51) && ('4' == 52) \
+      && ('5' == 53) && ('6' == 54) && ('7' == 55) && ('8' == 56) \
+      && ('9' == 57) && (':' == 58) && (';' == 59) && ('<' == 60) \
+      && ('=' == 61) && ('>' == 62) && ('?' == 63) && ('A' == 65) \
+      && ('B' == 66) && ('C' == 67) && ('D' == 68) && ('E' == 69) \
+      && ('F' == 70) && ('G' == 71) && ('H' == 72) && ('I' == 73) \
+      && ('J' == 74) && ('K' == 75) && ('L' == 76) && ('M' == 77) \
+      && ('N' == 78) && ('O' == 79) && ('P' == 80) && ('Q' == 81) \
+      && ('R' == 82) && ('S' == 83) && ('T' == 84) && ('U' == 85) \
+      && ('V' == 86) && ('W' == 87) && ('X' == 88) && ('Y' == 89) \
+      && ('Z' == 90) && ('[' == 91) && ('\\' == 92) && (']' == 93) \
+      && ('^' == 94) && ('_' == 95) && ('a' == 97) && ('b' == 98) \
+      && ('c' == 99) && ('d' == 100) && ('e' == 101) && ('f' == 102) \
+      && ('g' == 103) && ('h' == 104) && ('i' == 105) && ('j' == 106) \
+      && ('k' == 107) && ('l' == 108) && ('m' == 109) && ('n' == 110) \
+      && ('o' == 111) && ('p' == 112) && ('q' == 113) && ('r' == 114) \
+      && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \
+      && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \
+      && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126))
+/* The character set is not based on ISO-646.  */
+error "gperf generated tables don't work with this execution character set. Please report a bug to <bug-gnu-gperf@gnu.org>."
+#endif
+
+/* maximum key range = 37, duplicates = 0 */
+
+#ifndef GPERF_DOWNCASE
+#define GPERF_DOWNCASE 1
+static unsigned char gperf_downcase[256] =
+  {
+      0,   1,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  12,  13,  14,
+     15,  16,  17,  18,  19,  20,  21,  22,  23,  24,  25,  26,  27,  28,  29,
+     30,  31,  32,  33,  34,  35,  36,  37,  38,  39,  40,  41,  42,  43,  44,
+     45,  46,  47,  48,  49,  50,  51,  52,  53,  54,  55,  56,  57,  58,  59,
+     60,  61,  62,  63,  64,  97,  98,  99, 100, 101, 102, 103, 104, 105, 106,
+    107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
+    122,  91,  92,  93,  94,  95,  96,  97,  98,  99, 100, 101, 102, 103, 104,
+    105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
+    120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134,
+    135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
+    150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164,
+    165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179,
+    180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194,
+    195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209,
+    210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224,
+    225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
+    240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254,
+    255
+  };
+#endif
+
+#ifndef GPERF_CASE_STRNCMP
+#define GPERF_CASE_STRNCMP 1
+static int
+gperf_case_strncmp (s1, s2, n)
+     register const char *s1;
+     register const char *s2;
+     register unsigned int n;
+{
+  for (; n > 0;)
+    {
+      unsigned char c1 = gperf_downcase[(unsigned char)*s1++];
+      unsigned char c2 = gperf_downcase[(unsigned char)*s2++];
+      if (c1 != 0 && c1 == c2)
+        {
+          n--;
+          continue;
+        }
+      return (int)c1 - (int)c2;
+    }
+  return 0;
+}
+#endif
+
+#ifdef __GNUC__
+__inline
+#else
+#ifdef __cplusplus
+inline
+#endif
+#endif
+static unsigned int
+hash_block_tag (str, len)
+     register const char *str;
+     register unsigned int len;
+{
+  static const unsigned char asso_values[] =
+    {
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+       8, 30, 25, 20, 15, 10, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38,  0, 38,  0, 38,
+       5,  5,  5, 15,  0, 38, 38,  0, 15, 10,
+       0, 38, 38, 15,  0,  5, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38,  0, 38,
+       0, 38,  5,  5,  5, 15,  0, 38, 38,  0,
+      15, 10,  0, 38, 38, 15,  0,  5, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38, 38, 38, 38,
+      38, 38, 38, 38, 38, 38, 38
+    };
+  register int hval = len;
+
+  switch (hval)
+    {
+      default:
+        hval += asso_values[(unsigned char)str[1]+1];
+      /*FALLTHROUGH*/
+      case 1:
+        hval += asso_values[(unsigned char)str[0]];
+        break;
+    }
+  return hval;
+}
+
+#ifdef __GNUC__
+__inline
+#ifdef __GNUC_STDC_INLINE__
+__attribute__ ((__gnu_inline__))
+#endif
+#endif
+const char *
+find_block_tag (str, len)
+     register const char *str;
+     register unsigned int len;
+{
+  enum
+    {
+      TOTAL_KEYWORDS = 24,
+      MIN_WORD_LENGTH = 1,
+      MAX_WORD_LENGTH = 10,
+      MIN_HASH_VALUE = 1,
+      MAX_HASH_VALUE = 37
+    };
+
+  static const char * const wordlist[] =
+    {
+      "",
+      "p",
+      "dl",
+      "div",
+      "math",
+      "table",
+      "",
+      "ul",
+      "del",
+      "form",
+      "blockquote",
+      "figure",
+      "ol",
+      "fieldset",
+      "",
+      "h1",
+      "",
+      "h6",
+      "pre",
+      "", "",
+      "script",
+      "h5",
+      "noscript",
+      "",
+      "style",
+      "iframe",
+      "h4",
+      "ins",
+      "", "", "",
+      "h3",
+      "", "", "", "",
+      "h2"
+    };
+
+  if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
+    {
+      register int key = hash_block_tag (str, len);
+
+      if (key <= MAX_HASH_VALUE && key >= 0)
+        {
+          register const char *s = wordlist[key];
+
+          if ((((unsigned char)*str ^ (unsigned char)*s) & ~32) == 0 && !gperf_case_strncmp (str, s, len) && s[len] == '\0')
+            return s;
+        }
+    }
+  return 0;
+}

src/rt/sundown/src/markdown.h

@@ -0,0 +1,138 @@
+/* markdown.h - generic markdown parser */
+
+/*
+ * Copyright (c) 2009, Natacha Porté
+ *
+ * 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.
+ */
+
+#ifndef UPSKIRT_MARKDOWN_H
+#define UPSKIRT_MARKDOWN_H
+
+#include "buffer.h"
+#include "autolink.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SUNDOWN_VERSION "1.16.0"
+#define SUNDOWN_VER_MAJOR 1
+#define SUNDOWN_VER_MINOR 16
+#define SUNDOWN_VER_REVISION 0
+
+/********************
+ * TYPE DEFINITIONS *
+ ********************/
+
+/* mkd_autolink - type of autolink */
+enum mkd_autolink {
+	MKDA_NOT_AUTOLINK,	/* used internally when it is not an autolink*/
+	MKDA_NORMAL,		/* normal http/http/ftp/mailto/etc link */
+	MKDA_EMAIL,			/* e-mail link without explit mailto: */
+};
+
+enum mkd_tableflags {
+	MKD_TABLE_ALIGN_L = 1,
+	MKD_TABLE_ALIGN_R = 2,
+	MKD_TABLE_ALIGN_CENTER = 3,
+	MKD_TABLE_ALIGNMASK = 3,
+	MKD_TABLE_HEADER = 4
+};
+
+enum mkd_extensions {
+	MKDEXT_NO_INTRA_EMPHASIS = (1 << 0),
+	MKDEXT_TABLES = (1 << 1),
+	MKDEXT_FENCED_CODE = (1 << 2),
+	MKDEXT_AUTOLINK = (1 << 3),
+	MKDEXT_STRIKETHROUGH = (1 << 4),
+	MKDEXT_SPACE_HEADERS = (1 << 6),
+	MKDEXT_SUPERSCRIPT = (1 << 7),
+	MKDEXT_LAX_SPACING = (1 << 8),
+};
+
+/* sd_callbacks - functions for rendering parsed data */
+struct sd_callbacks {
+	/* block level callbacks - NULL skips the block */
+	void (*blockcode)(struct buf *ob, const struct buf *text, const struct buf *lang, void *opaque);
+	void (*blockquote)(struct buf *ob, const struct buf *text, void *opaque);
+	void (*blockhtml)(struct buf *ob,const  struct buf *text, void *opaque);
+	void (*header)(struct buf *ob, const struct buf *text, int level, void *opaque);
+	void (*hrule)(struct buf *ob, void *opaque);
+	void (*list)(struct buf *ob, const struct buf *text, int flags, void *opaque);
+	void (*listitem)(struct buf *ob, const struct buf *text, int flags, void *opaque);
+	void (*paragraph)(struct buf *ob, const struct buf *text, void *opaque);
+	void (*table)(struct buf *ob, const struct buf *header, const struct buf *body, void *opaque);
+	void (*table_row)(struct buf *ob, const struct buf *text, void *opaque);
+	void (*table_cell)(struct buf *ob, const struct buf *text, int flags, void *opaque);
+
+
+	/* span level callbacks - NULL or return 0 prints the span verbatim */
+	int (*autolink)(struct buf *ob, const struct buf *link, enum mkd_autolink type, void *opaque);
+	int (*codespan)(struct buf *ob, const struct buf *text, void *opaque);
+	int (*double_emphasis)(struct buf *ob, const struct buf *text, void *opaque);
+	int (*emphasis)(struct buf *ob, const struct buf *text, void *opaque);
+	int (*image)(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *alt, void *opaque);
+	int (*linebreak)(struct buf *ob, void *opaque);
+	int (*link)(struct buf *ob, const struct buf *link, const struct buf *title, const struct buf *content, void *opaque);
+	int (*raw_html_tag)(struct buf *ob, const struct buf *tag, void *opaque);
+	int (*triple_emphasis)(struct buf *ob, const struct buf *text, void *opaque);
+	int (*strikethrough)(struct buf *ob, const struct buf *text, void *opaque);
+	int (*superscript)(struct buf *ob, const struct buf *text, void *opaque);
+
+	/* low level callbacks - NULL copies input directly into the output */
+	void (*entity)(struct buf *ob, const struct buf *entity, void *opaque);
+	void (*normal_text)(struct buf *ob, const struct buf *text, void *opaque);
+
+	/* header and footer */
+	void (*doc_header)(struct buf *ob, void *opaque);
+	void (*doc_footer)(struct buf *ob, void *opaque);
+};
+
+struct sd_markdown;
+
+/*********
+ * FLAGS *
+ *********/
+
+/* list/listitem flags */
+#define MKD_LIST_ORDERED	1
+#define MKD_LI_BLOCK		2  /* <li> containing block data */
+
+/**********************
+ * EXPORTED FUNCTIONS *
+ **********************/
+
+extern struct sd_markdown *
+sd_markdown_new(
+	unsigned int extensions,
+	size_t max_nesting,
+	const struct sd_callbacks *callbacks,
+	void *opaque);
+
+extern void
+sd_markdown_render(struct buf *ob, const uint8_t *document, size_t doc_size, struct sd_markdown *md);
+
+extern void
+sd_markdown_free(struct sd_markdown *md);
+
+extern void
+sd_version(int *major, int *minor, int *revision);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+/* vim: set filetype=c: */

src/rt/sundown/src/stack.c

@@ -0,0 +1,81 @@
+#include "stack.h"
+#include <string.h>
+
+int
+stack_grow(struct stack *st, size_t new_size)
+{
+	void **new_st;
+
+	if (st->asize >= new_size)
+		return 0;
+
+	new_st = realloc(st->item, new_size * sizeof(void *));
+	if (new_st == NULL)
+		return -1;
+
+	memset(new_st + st->asize, 0x0,
+		(new_size - st->asize) * sizeof(void *));
+
+	st->item = new_st;
+	st->asize = new_size;
+
+	if (st->size > new_size)
+		st->size = new_size;
+
+	return 0;
+}
+
+void
+stack_free(struct stack *st)
+{
+	if (!st)
+		return;
+
+	free(st->item);
+
+	st->item = NULL;
+	st->size = 0;
+	st->asize = 0;
+}
+
+int
+stack_init(struct stack *st, size_t initial_size)
+{
+	st->item = NULL;
+	st->size = 0;
+	st->asize = 0;
+
+	if (!initial_size)
+		initial_size = 8;
+
+	return stack_grow(st, initial_size);
+}
+
+void *
+stack_pop(struct stack *st)
+{
+	if (!st->size)
+		return NULL;
+
+	return st->item[--st->size];
+}
+
+int
+stack_push(struct stack *st, void *item)
+{
+	if (stack_grow(st, st->size * 2) < 0)
+		return -1;
+
+	st->item[st->size++] = item;
+	return 0;
+}
+
+void *
+stack_top(struct stack *st)
+{
+	if (!st->size)
+		return NULL;
+
+	return st->item[st->size - 1];
+}
+

src/rt/sundown/src/stack.h

@@ -0,0 +1,29 @@
+#ifndef STACK_H__
+#define STACK_H__
+
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct stack {
+	void **item;
+	size_t size;
+	size_t asize;
+};
+
+void stack_free(struct stack *);
+int stack_grow(struct stack *, size_t);
+int stack_init(struct stack *, size_t);
+
+int stack_push(struct stack *, void *);
+
+void *stack_pop(struct stack *);
+void *stack_top(struct stack *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif