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/* -*- mode: c; c-file-style: "openbsd" -*- */
/*
* Copyright (c) 2010 Andreas Hofmeister <andi@collax.com>
*
* Permission to use, copy, modify, and/or 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wdocumentation"
#endif
#include <libxml/encoding.h>
#include <libxml/xmlwriter.h>
#if defined(__clang__)
# pragma clang diagnostic pop
#endif
#include "writer.h"
#include "../log.h"
struct xml_writer_private {
FILE *fh;
ssize_t depth;
xmlTextWriterPtr xw;
xmlDocPtr doc;
};
static void
xml_new_writer(struct xml_writer_private *priv)
{
priv->xw = xmlNewTextWriterDoc(&(priv->doc), 0);
if (!priv->xw) fatalx("lldpctl", "cannot create xml writer");
xmlTextWriterSetIndent(priv->xw, 4);
if (xmlTextWriterStartDocument(priv->xw, NULL, "UTF-8", NULL) < 0)
fatalx("lldpctl", "cannot start xml document");
}
static void
xml_start(struct writer *w, const char *tag, const char *descr)
{
struct xml_writer_private *p = w->priv;
if (p->depth == 0) xml_new_writer(p);
if (xmlTextWriterStartElement(p->xw, BAD_CAST tag) < 0)
log_warnx("lldpctl", "cannot start '%s' element", tag);
if (descr && (strlen(descr) > 0)) {
if (xmlTextWriterWriteFormatAttribute(p->xw, BAD_CAST "label", "%s",
descr) < 0)
log_warnx("lldpctl",
"cannot add attribute 'label' to element %s", tag);
}
p->depth++;
}
static void
xml_attr(struct writer *w, const char *tag, const char *descr, const char *value)
{
struct xml_writer_private *p = w->priv;
if (xmlTextWriterWriteFormatAttribute(p->xw, BAD_CAST tag, "%s",
value ? value : "") < 0)
log_warnx("lldpctl", "cannot add attribute %s with value %s", tag,
value ? value : "(none)");
}
static void
xml_data(struct writer *w, const char *data)
{
struct xml_writer_private *p = w->priv;
if (xmlTextWriterWriteString(p->xw, BAD_CAST(data ? data : "")) < 0)
log_warnx("lldpctl", "cannot add '%s' as data to element",
data ? data : "(none)");
}
static void
xml_end(struct writer *w)
{
struct xml_writer_private *p = w->priv;
if (xmlTextWriterEndElement(p->xw) < 0)
log_warnx("lldpctl", "cannot end element");
if (--p->depth == 0) {
int failed = 0;
if (xmlTextWriterEndDocument(p->xw) < 0) {
log_warnx("lldpctl", "cannot finish document");
failed = 1;
}
xmlFreeTextWriter(p->xw);
if (!failed) {
xmlDocDump(p->fh, p->doc);
fflush(p->fh);
}
xmlFreeDoc(p->doc);
}
}
static void
xml_finish(struct writer *w)
{
struct xml_writer_private *p = w->priv;
if (p->depth != 0) {
log_warnx("lldpctl", "unbalanced tags");
/* memory leak... */
}
free(p);
free(w);
}
struct writer *
xml_init(FILE *fh)
{
struct writer *result;
struct xml_writer_private *priv;
priv = malloc(sizeof(*priv));
if (!priv) {
fatalx("lldpctl", "out of memory");
return NULL;
}
priv->fh = fh;
priv->depth = 0;
result = malloc(sizeof(struct writer));
if (!result) fatalx("lldpctl", "out of memory");
result->priv = priv;
result->start = xml_start;
result->attr = xml_attr;
result->data = xml_data;
result->end = xml_end;
result->finish = xml_finish;
return result;
}
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