/* sudo apt-get install libxml2-dev */
/* gcc -Wdate-time -D_FORTIFY_SOURCE=2 -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall -Wextra $(xml2-config --cflags) -DPIC -fPIC -shared -o libforceXHTML.so forceXHTML.c */
/* LD_PRELOAD=$PWD/libforceXHTML.so xmlstarlet fo [-n] [-e encoding] filename|- */
/* do not use the xmlstarlet fo -o option! */

#include <stddef.h>
#include <stdio.h>
#include <libxml2/libxml/tree.h>
#include <libxml2/libxml/xmlsave.h>

static int
rpl_xmlSaveFormatFileEnc(const char *filename, xmlDocPtr cur,
    const char *encoding)
{
	xmlSaveCtxtPtr ctx;
	int i;

	if (!encoding)
		encoding = (const void *)cur->encoding;

	i = XML_SAVE_XHTML;
	if (xmlIndentTreeOutput)
		i |= XML_SAVE_FORMAT;

	ctx = xmlSaveToFilename(filename, encoding, i);
	if (!ctx)
		return (-1);
	i = xmlSaveDoc(ctx, cur);
	/* fucking libxml2 API gives us no way to check close() errors */
	if (i >= 0)
		i = xmlSaveClose(ctx);
	else
		xmlSaveClose(ctx);
	fprintf(stderr, "\nI: forceXHTML save %s\n",
	    i < 0 ? "failed" : "ok");
	return (i);
}

int
xmlSaveFormatFileEnc(const char *filename, xmlDocPtr cur,
    const char *encoding, int format __attribute__((__unused__)))
{
	return (rpl_xmlSaveFormatFileEnc(filename, cur, encoding));
}

int
xmlSaveFormatFile(const char *filename, xmlDocPtr cur,
    int format __attribute__((__unused__)))
{
	return (rpl_xmlSaveFormatFileEnc(filename, cur, NULL));
}