flightgear/utils/xmlgrep/xml.h

/* Copyright (c) 2007, 2008 by Adalin B.V.
 * Copyright (c) 2007, 2008 by Erik Hofman
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of (any of) the copyrightholder(s) nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __XML_CONFIG
#define __XML_CONFIG 1

/**
 * Open an XML file for processing
 *
 * @param fname path to the file 
 * @return XML-id which is used for further processing
 */
void *xmlOpen(const char *);

/**
 * Close the XML file after which no further processing is possible
 *
 * @param xid XML-id
 */
void xmlClose(const void *);


/**
 * Locate a subsection of the xml tree for further processing.
 * This adds processing speed since the reuired nodes will only be searched
 * in the subsection.
 *
 * The memory allocated for the XML-subsection-id has to be freed by the
 * calling program.
 *
 * @param xid XML-id
 * @param node path to the node containing the subsection
 * @return XML-subsection-id for further processing
 */
void *xmlGetNode(const void *, const char *);

/**
 * Copy a subsection of the xml tree for further processing.
 * This is useful when it's required to process a section of the XML code
 * after the file has been closed. The drawback is the added memory
 * requirements.
 *
 * The memory allocated for the XML-subsection-id has to be freed by the
 * calling program.
 *
 * @param xid XML-id
 * @param node path to the node containing the subsection
 * @return XML-subsection-id for further processing
 */
void *xmlCopyNode(void *, const char *);

/**
 * Get the number of elements  with the same name from a specified xml path
 *
 * @param xid XML-id
 * @param path path to the xml node
 * @return the number count of the nodename
 */
unsigned int xmlGetNumElements(void *, const char *);

/**
 * Get the next occurrence of element in the parent node
 * The return value should neevr be altered or freed by the caller
 *
 * @param pid XML-id of the parent node of this node
 * @param xid XML-id
 * @param element name of the element to search for
 * @return name of the element or NULL if unsuccessful
 */
const char *xmlGetNextElement(const void *, void *, const char *);

/**
 * Compare the value of this element to a reference string.
 * Comparing is done in a case insensitive way.
 *
 * @param xid XML-id
 * @param s the string to compare to.
 * @return an integer less than, equal to, ro greater than zero if the value
 * of the node is found, respectively, to be less than, to match, or be greater
 * than s
 */
int xmlCompareString(const void *, const char *);


/**
 * Get a string of characters from a specified xml path
 * This function has the advantage of not allocating its own return buffer,
 * keeping the memory management to an absolute minimum but the disadvantage
 * is that it's unreliable in multithread environments.
 *
 * @param xid XML-id
 * @param path path to the xml node
 * @param buffer the buffer to copy the string to
 * @param buflen length of the destination buffer
 * @return the length of the string
 */
unsigned int xmlCopyNodeString(void *, const char *, char *, const unsigned int);

/**
 * Get a string of characters from the current node
 * The returned string has to be freed by the calling program.
 *
 * @param xid XML-id
 * @return a newly alocated string containing the contents of the node.
 */
char *xmlGetString(void *);

/**
 * Get a string of characters from a specified xml path
 * The returned string has to be freed by the calling program.
 *
 * @param xid XML-id
 * @param path path to the xml node
 * @return a newly alocated string containing the contents of the node.
 */
char *xmlGetNodeString(void *, const char *);

/**
 * Compare the value of a node to a reference string.
 * Comparing is done in a case insensitive way.
 *
 * @param xid XML-id
 * @param path path to the xml node to compare to
 * @param s the string to compare to.
 * @return an integer less than, equal to, ro greater than zero if the value
 * of the node is found, respectively, to be less than, to match, or be greater
 * than s
 */
int xmlCompareNodeString(const void *, const char *, const char *);

/**
 * Get the integer value from the current node
 *
 * @param xid XML-id
 * @return the contents of the node converted to an integer value.
 */
long int xmlGetInt(void *);

/**
 * Get an integer value from a specified xml path
 *
 * @param xid XML-id
 * @param path path to the xml node
 * @return the contents of the node converted to an integer value.
 */
long int xmlGetNodeInt(void *, const char *);

/**
 * Get the double value from the curent node
 *
 * @param xid XML-id
 * @return the contents of the node converted to a double value.
 */
double xmlGetDouble(void *);

/**
 * Get a double value from a specified xml path
 *
 * @param xid XML-id
 * @param path path to the xml node
 * @return the contents of the node converted to a double value.
 */
double xmlGetNodeDouble(void *, const char *);

void *xmlMarkId(void *);

#endif /* __XML_CONFIG */