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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <glib/gstdio.h>
#include "e-xml-utils.h"
#ifdef G_OS_WIN32
#define fsync(fd) 0
#endif
/**
* e_xml_parse_file:
* @filename: path to an XML file
*
* Reads a local XML file and parses the contents into an XML document
* structure. If the XML file cannot be read or its contents are malformed,
* the function returns %NULL.
*
* Returns: an XML document structure, or %NULL
**/
xmlDocPtr
e_xml_parse_file (const gchar *filename)
{
xmlDocPtr result = NULL;
GMappedFile *mapped_file;
mapped_file = g_mapped_file_new (filename, FALSE, NULL);
if (mapped_file) {
result = xmlParseMemory (
g_mapped_file_get_contents (mapped_file),
g_mapped_file_get_length (mapped_file));
g_mapped_file_unref (mapped_file);
}
return result;
}
/**
* e_xml_save_file:
* @filename: path to a file to save to
* @doc: an XML document structure
*
* Writes the given XML document structure to the file given by @filename.
* If an error occurs while saving, the function returns -1 and sets errno.
*
* Returns: 0 on success, -1 on failure
**/
gint
e_xml_save_file (const gchar *filename,
xmlDocPtr doc)
{
gchar *filesave;
xmlChar *xmlbuf;
gsize n, written = 0;
gint ret, fd, size;
gint errnosave;
gssize w;
gchar *dirname = g_path_get_dirname (filename);
gchar *basename = g_path_get_basename (filename);
gchar *savebasename = g_strconcat (".#", basename, NULL);
g_free (basename);
filesave = g_build_filename (dirname, savebasename, NULL);
g_free (savebasename);
g_free (dirname);
fd = g_open (filesave, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0600);
if (fd == -1) {
g_free (filesave);
return -1;
}
xmlDocDumpFormatMemory (doc, &xmlbuf, &size, TRUE);
if (size <= 0) {
close (fd);
g_unlink (filesave);
g_free (filesave);
errno = ENOMEM;
return -1;
}
n = (gsize) size;
do {
do {
w = write (fd, xmlbuf + written, n - written);
} while (w == -1 && errno == EINTR);
if (w > 0)
written += w;
} while (w != -1 && written < n);
xmlFree (xmlbuf);
if (written < n || fsync (fd) == -1) {
errnosave = errno;
close (fd);
g_unlink (filesave);
g_free (filesave);
errno = errnosave;
return -1;
}
while ((ret = close (fd)) == -1 && errno == EINTR)
;
if (ret == -1) {
g_free (filesave);
return -1;
}
if (g_rename (filesave, filename) == -1) {
errnosave = errno;
g_unlink (filesave);
g_free (filesave);
errno = errnosave;
return -1;
}
g_free (filesave);
return 0;
}
/**
* e_xml_get_child_by_name:
* @parent: an XML node structure
* @child_name: element name of a child node
*
* Attempts to find a child element of @parent named @child_name.
* If no such child exists, the function returns %NULL.
*
* Returns: a child XML node structure, or %NULL
**/
xmlNode *
e_xml_get_child_by_name (const xmlNode *parent,
const xmlChar *child_name)
{
xmlNode *child;
g_return_val_if_fail (parent != NULL, NULL);
g_return_val_if_fail (child_name != NULL, NULL);
for (child = parent->xmlChildrenNode; child != NULL; child = child->next) {
if (xmlStrcmp (child->name, child_name) == 0) {
return child;
}
}
return NULL;
}
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