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authortpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-05-14 02:06:47 +0000
committertpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-05-14 02:06:47 +0000
commitacc2b77512ce0d8d708dda14dec1464f3eed830c (patch)
tree7917cc141e67ba40a4d4b06c752b66ede069b3da /libkcal/libical/doc
parent54887c51b14c7707178d43d39413bf1bc7a17472 (diff)
downloadtdepim-acc2b77512ce0d8d708dda14dec1464f3eed830c.tar.gz
tdepim-acc2b77512ce0d8d708dda14dec1464f3eed830c.zip
Second batch of kdepim stability and functionality repairs
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1126473 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
Diffstat (limited to 'libkcal/libical/doc')
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-rw-r--r--libkcal/libical/doc/UsingLibical.lyx2578
-rw-r--r--libkcal/libical/doc/UsingLibical.ps2327
-rw-r--r--libkcal/libical/doc/UsingLibical.txt1384
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-EXTRA_DIST = UsingLibical.lyx UsingLibical.ps UsingLibical.txt
diff --git a/libkcal/libical/doc/UsingLibical.lyx b/libkcal/libical/doc/UsingLibical.lyx
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+++ /dev/null
@@ -1,2578 +0,0 @@
-#LyX 1.1 created this file. For more info see http://www.lyx.org/
-\lyxformat 2.16
-\textclass article
-\language default
-\inputencoding latin1
-\fontscheme default
-\graphics default
-\paperfontsize default
-\spacing single
-\papersize Default
-\paperpackage a4
-\use_geometry 0
-\use_amsmath 0
-\paperorientation portrait
-\secnumdepth 3
-\tocdepth 3
-\paragraph_separation indent
-\defskip medskip
-\quotes_language english
-\quotes_times 2
-\papercolumns 1
-\papersides 1
-\paperpagestyle default
-
-\layout Title
-
-Using Libical
-\layout Author
-
-Eric Busboom (eric@softwarestudio.org)
-\layout Date
-
-January 2001
-\layout Standard
-
-
-\begin_inset LatexCommand \tableofcontents{}
-
-\end_inset
-
-
-\layout Section
-
-Introduction
-\layout Standard
-
-Libical is an Open Source implementation of the iCalendar protocols and
- protocol data units.
- The iCalendar specification describes how calendar clients can communicate
- with calendar servers so users can store their calendar data and arrange
- meetings with other users.
-
-\layout Standard
-
-Libical implements RFC2445, RFC2446 and some of RFC2447 and the CAP draft.
-
-\layout Standard
-
-This documentation assumes that you are familiar with the iCalendar standards
- RFC2445 and RFC2446.
- these specifications are online on the CALSCH webpage at:
-\layout LyX-Code
-
-http://www.imc.org/ietf-calendar/
-\layout Subsection
-
-The libical project
-\layout Standard
-
-This code is under active development.
- If you would like to contribute to the project, you can contact me, Eric
- Busboom, at eric@softwarestudio.org.
- The project has a webpage at
-\layout LyX-Code
-
-http://softwarestudio.org/libical/index.html
-\layout Standard
-
-and a mailing list that you can join by sending the following mail:
-\layout LyX-Code
-
-To: minimalist@softwarestudio.org
-\layout LyX-Code
-
-Subject: subscribe libical
-\layout Subsection
-
-License
-\layout Standard
-
-The code and datafiles in this distribution are licensed under the Mozilla
- Public License.
- See http://www.mozilla.org/NPL/MPL-1.0.html for a copy of the license.
- Alternately, you may use libical under the terms of the GNU Library General
- Public License.
- See http://www.fsf.org/copyleft/lesser.html for a copy of the LGPL.
-\layout Standard
-
-This dual license ensures that the library can be incorporated into both
- proprietary code and GPL'd programs, and will benefit from improvements
- made by programmers in both realms.
- I will only accept changes into my version of the library if they are similarly
- dual-licensed.
-\layout Subsection
-
-Example Code
-\layout Standard
-
-A lot of the documentation for this library is in the form of example code.
- These examples are in the
-\begin_inset Quotes eld
-\end_inset
-
-examples
-\begin_inset Quotes erd
-\end_inset
-
- directory of the distribution.
- Also look in
-\begin_inset Quotes eld
-\end_inset
-
-src/test
-\begin_inset Quotes erd
-\end_inset
-
- for additional annotated examples.
-
-\layout Section
-
-Building and Installing the Library
-\layout Standard
-
-Libical uses autoconf to generate makefiles.
- It should built with no adjustments on Linux, FreeBSD and Solaris under
- gcc.
- Some version have been successfully been build on MacOS, Solaris, UnixWare,
- And Tru64 UNIX without gcc, but you may run into problems with a particular
- later version.
-
-\layout Standard
-
-For a more complete guide to building the library, see the README file in
- the distribution.
-
-\layout Standard
-
-
-\begin_inset Quotes eld
-\end_inset
-
-make install
-\begin_inset Quotes erd
-\end_inset
-
- will install the libraries and header files for three modules: libical,
- libicalss.
- and libicalvcal.
- If you build shared objects, then these files will be installed:
-\layout Itemize
-
-ical.h
-\layout Itemize
-
-libical.a
-\layout Itemize
-
-libical.so
-\layout Itemize
-
-icalss.h
-\layout Itemize
-
-libicalss.a
-\layout Itemize
-
-libicalss.so
-\layout Itemize
-
-icalvcal.h
-\layout Itemize
-
-libicalvcal.a
-\layout Itemize
-
-libicalvcal.so
-\layout Standard
-
-The header files ical.h and icalss.h are combined header files, generated
- by concatenating together all of the header files in src/libical and src/libica
-lss respectively.
-
-\layout Section
-
-Structure
-\layout Standard
-
-The iCal calendar model is based on four types of objects: components, propertie
-s, values and parameters.
-
-\layout Standard
-
-Properties are the fundamental unit of information in iCal, and they work
- a bit like a hash entry, with a constant key and a variable value.
- Properties may also have modifiers, called parameters.
- In the iCal content line
-\layout LyX-Code
-
-ORGANIZER;ROLE=CHAIR:MAILTO:mrbig@host.com
-\layout Standard
-
-The property name is
-\begin_inset Quotes eld
-\end_inset
-
-ORGANIZER,
-\begin_inset Quotes erd
-\end_inset
-
- the value of the property is
-\begin_inset Quotes eld
-\end_inset
-
-mrbig@host.com
-\begin_inset Quotes erd
-\end_inset
-
- and the
-\begin_inset Quotes eld
-\end_inset
-
-ROLE
-\begin_inset Quotes erd
-\end_inset
-
- parameter specifies that Mr Big is the chair of the meetings associated
- with this property.
-
-\layout Standard
-
-Components are groups of properties that represent the core objects of a
- calendar system, such as events or timezones.
- Components are delimited by
-\begin_inset Quotes eld
-\end_inset
-
-BEGIN
-\begin_inset Quotes erd
-\end_inset
-
- and
-\begin_inset Quotes eld
-\end_inset
-
-END
-\begin_inset Quotes erd
-\end_inset
-
- tags.
-
-\layout Standard
-\added_space_bottom 0.3cm
-When a component is sent across a network, if it is un-encrypted, it will
- look something like:
-\layout LyX-Code
-
-BEGIN:VCALENDAR
-\layout LyX-Code
-
-METHOD:REQUEST
-\layout LyX-Code
-
-PRODID: -//hacksw/handcal//NONSGML v1.0//EN
-\layout LyX-Code
-
-BEGIN:VEVENT
-\layout LyX-Code
-
-DTSTAMP:19980309T231000Z
-\layout LyX-Code
-
-UID:guid-1.host1.com
-\layout LyX-Code
-
-ORGANIZER;ROLE=CHAIR:MAILTO:mrbig@host.com
-\layout LyX-Code
-
-ATTENDEE;RSVP=TRUE;ROLE=REQ-PARTICIPANT;CUTYPE=GROUP:
-\layout LyX-Code
-
- MAILTO:employee-A@host.com
-\layout LyX-Code
-
-DESCRIPTION:Project XYZ Review Meeting
-\layout LyX-Code
-
-CATEGORIES:MEETING
-\layout LyX-Code
-
-CLASS:PUBLIC
-\layout LyX-Code
-
-CREATED:19980309T130000Z
-\layout LyX-Code
-
-SUMMARY:XYZ Project Review
-\layout LyX-Code
-
-DTSTART;TZID=US-Eastern:19980312T083000
-\layout LyX-Code
-
-DTEND;TZID=US-Eastern:19980312T093000
-\layout LyX-Code
-
-LOCATION:1CP Conference Room 4350
-\layout LyX-Code
-
-END:VEVENT
-\layout LyX-Code
-
-END:VCALENDAR
-\layout Standard
-
-Note that components can be nested; this example has both a VCALENDAR and
- a VEVENT component, one nested inside the other.
-
-\layout Standard
-
-The main goal of Libical is to offer a structured, type-safe to create,
- access and manipulate components and their properties, values and parameters.
-
-\layout Subsection
-
-Core iCal classes
-\layout Standard
-
-Libical is an object-based, data-oriented library.
- There are no real-objects, but the way the routines are named and organized
- results in the same sort of encapsulations and abstraction that are major
- features of Object-Orieted languages.
- Nearly all of the routines in the library are associated with an opaque
- data types and perform some operation on that data type.
- For instnace, a Property is declared as:
-\layout LyX-Code
-
-icalproperty *prop;
-\layout Standard
-
-Icalproperty is typedef'd to void, so the only way to manipulate it is through
- the accessor routines, all of which have a form similar to:
-\layout LyX-Code
-
-char* icalproperty_as_ical_string(icalproperty* prop);
-\layout Standard
-
-That is, the name of the 'class' is the first word in the routine name,
- and the first parameter is a pointer to the 'object.'
-\layout Standard
-
-Although the library does not actually have classes, we will use those terms
- since the behavior of these associations of data and routines is very similar
- to a class.
-
-\layout Subsubsection
-
-Properties
-\layout LyX-Code
-
-icalproperty *prop;
-\layout Standard
-
-Properties are represented with the icalproperty class and its many
-\begin_inset Quotes eld
-\end_inset
-
-derived
-\begin_inset Quotes erd
-\end_inset
-
- classes with on
-\begin_inset Quotes eld
-\end_inset
-
-derived
-\begin_inset Quotes erd
-\end_inset
-
- class per property type in RFC2445.
- Again, there is no actual inheritance relations, but there are clusters
- of routines that make this term useful.
- A property is a container for a single value and a set of parameters.
-
-\layout Subsubsection
-
-Components
-\layout LyX-Code
-
-icalcomponent *comp;
-\layout Standard
-
-In libical, components are represented with the icalcomponent class.
- Icalcomponent is a container for a set of other components and properties.
-\layout Subsubsection
-
-Values
-\layout LyX-Code
-
-icalvalue *value;
-\layout Standard
-
-Values are represented in a similar way to properties; a base class and
- many
-\begin_inset Quotes eld
-\end_inset
-
-derived
-\begin_inset Quotes eld
-\end_inset
-
- classes.
- A value is essentially a abstract handle on a single fundamental type,
- a structure or a union.
- You probably will never use a value directly, since for most operations
- you can get to its data through the property that holds it.
-
-\layout Subsubsection
-
-Parameters
-\layout LyX-Code
-
-icalparameter *param;
-\layout Standard
-
-Parameters are represetned in a similar way to properties, except that they
- contain only one value
-\layout Subsection
-
-Other elements of libical
-\layout Standard
-
-In addition to the core iCal classes, libical has many other types, structures,
- classes that aid in creating and using iCal components.
-
-\layout Subsubsection
-
-Enumerations and types
-\layout Standard
-
-Libical is strongly typed, so every component, property, parameter, and
- value type has an enumeration, and some have an associated structure or
- union.
-
-\layout Subsubsection
-
-The parser
-\layout Standard
-
-The libical parser offers a variety of ways to convert RFC2445 text into
- a libical iinsteral component structure.
- the parser can parse blocks of text as a string, or it can parse lin-by-line.
-\layout Subsubsection
-
-Error objects
-\layout Standard
-
-Libical has a substantial error reporting system for both programming errors
- and component usage errors.
-
-\layout Subsubsection
-
-Memory Management
-\layout Standard
-
-Since many of libicals interfaces return strings, the library has its own
- memory management system to elimiate the need to free every string returned
- from the libraru.
-
-\layout Subsubsection
-
-Storage classes
-\layout Standard
-
-The library also offers several classes to store components to flies, memory
- or databases.
-
-\layout Section
-
-Differences From RFCs
-\layout Standard
-
-Libical has been designed to follow the standards as closely as possible,
- so that the key objects in the standards are also key objects in the library.
- However, there are a few areas where the specifications are (arguably)
- irregular, and following them exactly would result in an unfriendly interface.
- These deviations make libical easier to use by maintaining a self-similar
- interface.
-
-\layout Subsection
-
-Pseudo Components
-\layout Standard
-
-Libical defines components for groups of properties that look and act like
- components, but are not defined as components in the specification.
- XDAYLIGHT and XSTANDARD are notable examples.
- These pseudo components group properties within the VTIMEZONE components.
- For instanace, the timezone properties associated with daylight savings
- time starts with
-\begin_inset Quotes eld
-\end_inset
-
-BEGIN:DAYLIGHT
-\begin_inset Quotes erd
-\end_inset
-
- and ends with
-\begin_inset Quotes eld
-\end_inset
-
-END:DAYLIGHT, just like other components, but is not defined as a component
- in RFC2445.
- ( See RFC2445, page 61 ) In Libical,this grouping is represented by the
- XDAYLIGHT component.
- Standard iCAL components all start with the letter
-\begin_inset Quotes eld
-\end_inset
-
-V,
-\begin_inset Quotes erd
-\end_inset
-
- while pseudo components start with
-\begin_inset Quotes erd
-\end_inset
-
-X.
-\begin_inset Quotes erd
-\end_inset
-
-
-\layout Standard
-
-There are also pseudo components that are conceptually derived classes of
- VALARM.
- RFC2446 defines what properties may be included in each component, and
- for VALARM, the set of properties it may have depends on the value of the
- ACTION property.
-
-\layout Standard
-
-For instance, if a VALARM component has an ACTION property with the value
- of
-\begin_inset Quotes eld
-\end_inset
-
-AUDIO,
-\begin_inset Quotes erd
-\end_inset
-
- the component must also have an
-\begin_inset Quotes eld
-\end_inset
-
-ATTACH
-\begin_inset Quotes erd
-\end_inset
-
- property.
- However, if the ACTION value is
-\begin_inset Quotes eld
-\end_inset
-
-DISPLAY,
-\begin_inset Quotes erd
-\end_inset
-
- the component must have a DESCRIPTION property.
-
-\layout Standard
-
-To handle these various, complex restrictions, libical has pseudo components
- for each type of alarm: XAUDIOALARM, XDISPLAYALARM, XEMAILALARM and XPROCEDUREA
-LARM.
-
-\layout Subsection
-
-Combined Values
-\layout Standard
-
-Many values can take more than one type.
- TRIGGER, for instance, can have a value type of with DURATION or of DATE-TIME.
- These multiple types make it difficult to create routines to return the
- value associated with a property.
-
-\layout Standard
-
-It is natural to have interfaces that would return the value of a property,
- but it is cumbersome for a single routine to return multiple types.
- So, in libical, properties that can have multiple types are given a single
- type that is the union of their RFC2445 types.
- For instance, in libical, the value of the TRIGGER property resolves to
- struct icaltriggertype.
- This type is a union of a DURATION and a DATE-TIME.
-
-\layout Subsection
-
-Multi-Valued Properties
-\layout Standard
-
-Some properties, such as CATEGORIES have only one value type, but each CATEGORIE
-S property can have multiple value instances.
- This also results in a cumbersome interface -- CATEGORIES accessors would
- have to return a list while all other accessors returned a single value.
- In libical, all properties have a single value, and multi-valued properties
- are broken down into multiple single valued properties during parsing.
- That is, an input line like,
-\layout LyX-Code
-
-CATEGORIES: work, home
-\layout Standard
-
-becomes in libical's internal representation
-\layout LyX-Code
-
-CATEGORIES: work
-\layout LyX-Code
-
-CATEGORIES: home
-\layout Standard
-
-Oddly, RFC2445 allows some multi-valued properties ( like FREEBUSY ) to
- exist as both a multi-values property and as multiple single value properties,
- while others ( like CATEGORIES ) can only exist as single multi-valued
- properties.
- This makes the internal representation for CATEGORIES illegal.
- However when you convert a component to a string, the library will collect
- all of the CATEGORIES properties into one.
-
-\layout Section
-
-Using libical
-\layout Subsection
-
-Creating Components
-\layout Standard
-
-There are three ways to create components in Libical:
-\layout Itemize
-
-Create individual components, properties and parameters and assemble them
- into structures
-\layout Itemize
-
-Build complete components with nested vaargs calls
-\layout Itemize
-
-Parse bits of text
-\layout Itemize
-
-Parse entire files
-\layout Subsubsection
-
-Constructor Interfaces
-\layout Standard
-
-Using constructor interfaces, you create each of the objects separately
- and then assemble them in to components:
-\layout LyX-Code
-
-icalcomponent *event;
-\layout LyX-Code
-
-icalproperty *prop;
-\layout LyX-Code
-
-icalparameter *param;
-\layout LyX-Code
-
-struct icaltimetype atime;
-\layout LyX-Code
-
-\layout LyX-Code
-
-event = icalcomponent_new(ICAL_VEVENT_COMPONENT);
-\layout LyX-Code
-
-prop = icalproperty_new_dtstamp(atime);
-\layout LyX-Code
-
-icalcomponent_add_property(event, prop);
-\layout LyX-Code
-
-\layout LyX-Code
-
-prop = icalproperty_new_uid(''guid-1.host1.com'') );
-\layout LyX-Code
-
-icalcomponent_add_property(event,prop);
-\layout LyX-Code
-
-\layout LyX-Code
-
-prop=icalproperty_new_organizer(''mrbig@host.com'');
-\layout LyX-Code
-
-param = icalparameter_new_role(ICAL_ROLE_CHAIR)
-\layout LyX-Code
-
-icalproperty_add_parameter(prop, param);
-\layout LyX-Code
-
-\layout LyX-Code
-
-icalcomponent_add_property(event,prop);
-\layout Standard
-
-Notice that libical uses a semi-object-oriented style of interface.
- Most things you work with are objects, that are instantiated with a constructor
- that has
-\begin_inset Quotes eld
-\end_inset
-
-new
-\begin_inset Quotes erd
-\end_inset
-
- in the name.
- Also note that, other than the object reference, most structure data is
- passed in to libical routines by value.
- Libical has some complex but very regular memory handling rules.
- These are detailed in section
-\begin_inset LatexCommand \ref{sec:memory}
-
-\end_inset
-
-.
-\layout Standard
-
-If any of the constructors fail, they will return 0.
- If you try to insert 0 into a property or component, or use a zero-valued
- object reference, libical will either silently ignore the error or will
- abort with an error message.
- This behavior is controlled by a compile time flag (ICAL_ERRORS_ARE_FATAL),
- and will abort by default.
-
-\layout Subsubsection
-
-vaargs Constructors
-\layout Standard
-
-There is another way to create complex components, which is arguably more
- elegant, if you are not horrified by varargs.
- The varargs constructor interface allows you to create intricate components
- in a single block of code.
- Here is the previous examples in the vaargs style.
-
-\layout LyX-Code
-
- calendar =
-\layout LyX-Code
-
- icalcomponent_vanew(
-\layout LyX-Code
-
- ICAL_VCALENDAR_COMPONENT,
-\layout LyX-Code
-
- icalproperty_new_version(''2.0''),
-\layout LyX-Code
-
- icalproperty_new_prodid(
-\layout LyX-Code
-
- ''-//RDU Software//NONSGML HandCal//EN''),
-\layout LyX-Code
-
- icalcomponent_vanew(
-\layout LyX-Code
-
- ICAL_VEVENT_COMPONENT,
-\layout LyX-Code
-
- icalproperty_new_dtstamp(atime),
-\layout LyX-Code
-
- icalproperty_new_uid(''guid-1.host1.com''),
-\layout LyX-Code
-
- icalproperty_vanew_organizer(
-\layout LyX-Code
-
- ''mrbig@host.com''),
-\layout LyX-Code
-
- icalparameter_new_role(ICAL_ROLE_CHAIR),
-\layout LyX-Code
-
- 0
-\layout LyX-Code
-
- ),
-\layout LyX-Code
-
- icalproperty_vanew_attendee(
-\layout LyX-Code
-
- ''employee-A@host.com'',
-\layout LyX-Code
-
- icalparameter_new_role(
-\layout LyX-Code
-
- ICAL_ROLE_REQPARTICIPANT),
-\layout LyX-Code
-
- icalparameter_new_rsvp(1),
-\layout LyX-Code
-
- icalparameter_new_cutype(ICAL_CUTYPE_GROUP),
-\layout LyX-Code
-
- 0
-\layout LyX-Code
-
- ),
-\layout LyX-Code
-
- icalproperty_new_location(
-\layout LyX-Code
-
- "1CP Conference Room 4350"),
-\layout LyX-Code
-
- 0
-\layout LyX-Code
-
- ),
-\layout LyX-Code
-
- 0
-\layout LyX-Code
-
- );
-\layout Standard
-
-This form is similar to the constructor form , except that the constructors
- have
-\begin_inset Quotes eld
-\end_inset
-
-vanew
-\begin_inset Quotes erd
-\end_inset
-
- instead of
-\begin_inset Quotes eld
-\end_inset
-
-new
-\begin_inset Quotes erd
-\end_inset
-
- in the name.
- The arguments are similar too, except that the component constructor can
- have a list of properties, and the property constructor can have a list
- of parameters.
- Be sure to terminate every list with a '0', or your code will crash, if
- you are lucky.
-
-\layout Subsubsection
-
-Parsing Text
-\layout Standard
-
-Several routines are available for generating objects from text.
- For properties, use:
-\layout LyX-Code
-
-icalproperty* p;
-\layout LyX-Code
-
-p = icalproperty_new_from_string("DTSTART:19970101T120000Z
-\backslash
-n");
-\layout Standard
-
-For parameters, use:
-\layout LyX-Code
-
-icalparameter *param
-\layout LyX-Code
-
-param = icalparameter_new_from_string("PARTSTAT=ACCEPTED");
-\layout Standard
-
-The final way to create components will probably be the most common; you
- can create components from RFC2445 compliant text.
- If you have the string in memory, use
-\layout LyX-Code
-
-icalcomponent* icalcomponent_new_from_string(char* str);
-\layout Standard
-
-If the string contains only one component, the routine will return the component
- in libical form.
- If the string contains multiple components, the multiple components will
- be returned as the children of an ICAL_XROOT_COMPONENT component.
- This routine is identical to ( and actually uses ) icalparser_parse_string(char
-* str).
-\layout Standard
-
-Parsing a whole string may seem wasteful if you want to pull a large component
- off of the network or from a file; you may prefer to parse the component
- line by line.
- This is possible too by using:
-\layout LyX-Code
-
-icalparser* icalparser_new();
-\layout LyX-Code
-
-void icalparser_free(icalparser* parser);
-\layout LyX-Code
-
-icalparser_get_line(parser,read_stream);
-\layout LyX-Code
-
-icalparser_add_line(parser,line);
-\layout LyX-Code
-
-icalparser_set_gen_data(parser,stream)
-\layout Standard
-
-These routines will construct a parser object to which you can add lines
- of input and retrieve any components that the parser creates from the input.
- These routines work by specifing an adaptor routine to get string data
- from a source.
- For an example:
-\layout LyX-Code
-
-char* read_stream(char *s, size_t size, void *d)
-\layout LyX-Code
-
-{
-\layout LyX-Code
-
- char *c = fgets(s,size, (FILE*)d);
-\layout LyX-Code
-
- return c;
-\layout LyX-Code
-
-}
-\layout LyX-Code
-
-main() {
-\layout LyX-Code
-
- char* line;
-\layout LyX-Code
-
- icalcomponent *c;
-\layout LyX-Code
-
- icalparser *parser = icalparser_new();
-\layout LyX-Code
-
- FILE* stream = fopen(argv[1],"r");
-\layout LyX-Code
-
- icalparser_set_gen_data(parser,stream);
-\layout LyX-Code
-
- do{
-\layout LyX-Code
-
- line = icalparser_get_line(parser,read_stream);
-\layout LyX-Code
-
- c = icalparser_add_line(parser,line);
-\layout LyX-Code
-
- if (c != 0){
-\layout LyX-Code
-
- printf("%s",icalcomponent_as_ical_string(c));
-\layout LyX-Code
-
- icalparser_claim(parser);
-\layout LyX-Code
-
- printf("
-\backslash
-n---------------
-\backslash
-n");
-\layout LyX-Code
-
- icalcomponent_free(c);
-\layout LyX-Code
-
- }
-\layout LyX-Code
-
- } while ( line != 0);
-\layout LyX-Code
-
-}
-\layout Standard
-
-The parser object parameterizes the routine used to get input lines with
- icalparser_set_gen_data() and
-\emph on
-
-\emph default
-icalparser_get_line().
- In this example, the routine read_stream() will fetch the next line from
- a stream, with the stream passed in as the void* parameter d.
- The parser calls read_stream() from icalparser_get_line(), but it also
- needs to know what stream to use.
- This is set by the call to icalparser_set_gen_data().
- By using a different routine for read_stream or passing in different data
- with icalparser_set_gen_data, you can connect to any data source.
-
-\layout Standard
-
-Using the same mechanism, other implementations could read from memory buffers,
- sockets or other interfaces.
-
-\layout Standard
-
-Since the example code is a very common way to use the parser, there is
- a convenience routine;
-\layout LyX-Code
-
-icalcomponent* icalparser_parse(icalparser *parser,
-\layout LyX-Code
-
- char* (*line_gen_func)(char *s, size_t size, void* d))
-\layout Standard
-
-To use this routine, you still must construct the parser object and pass
- in a reference to a line reading routine.
- If the parser can create a single component from the input, it will return
- a pointer to the newly constructed component.
- If the parser can construct multiple components from the input, it will
- return a reference to an XROOT component ( of type ICAL_XROOT_COMPONENT.)
- This XROOT component will hold all of the components constructed from the
- input as children.
-
-\layout Subsection
-
-Accessing Components
-\layout Standard
-
-Given a reference to a component, you probably will want to access the propertie
-s, parameters and values inside.
- Libical interfaces let you find sub-components, add and remove sub-components,
- and do the same three operations on properties.
-
-\layout Subsubsection
-
-Finding Components
-\layout Standard
-
-To find a sub-component of a component, use:
-\layout LyX-Code
-
-icalcomponent* icalcomponent_get_first_component(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalcomponent_kind kind);
-\layout Standard
-
-This routine will return a reference to the first component of the type
- 'kind.' The key kind values, listed in icalenums.h are:
-\layout LyX-Code
-
-ICAL_ANY_COMPONENT
-\layout LyX-Code
-
-ICAL_VEVENT_COMPONENT
-\layout LyX-Code
-
-ICAL_VTODO_COMPONENT
-\layout LyX-Code
-
-ICAL_VJOURNAL_COMPONENT
-\layout LyX-Code
-
-ICAL_VCALENDAR_COMPONENT
-\layout LyX-Code
-
-ICAL_VFREEBUSY_COMPONENT
-\layout LyX-Code
-
-ICAL_VALARM_COMPONENT
-\layout Standard
-
-These are only the most common components; there are many more listed in
- icalenums.h.
-\layout Standard
-
-As you might guess, if there is more than one subcomponent of the type you
- have chosen, this routine will return only the first.
- to get at the others, you need to iterate through the component.
-
-\layout Subsubsection
-
-Iterating Through Components
-\layout Standard
-
-Iteration requires a second routine to get the next subcomponent after the
- first:
-\layout LyX-Code
-
-icalcomponent* icalcomponent_get_next_component(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalcomponent_kind kind);
-\layout Standard
-
-With the 'first' and 'next' routines, you can create a for loop to iterate
- through all of a components subcomponents
-\layout LyX-Code
-
- for(c = icalcomponent_get_first_component(comp,ICAL_ANY_COMPONENT);
-\layout LyX-Code
-
- c != 0;
-\layout LyX-Code
-
- c = icalcomponent_get_next_component(comp,ICAL_ANY_COMPONENT))
-\layout LyX-Code
-
-{
-\layout LyX-Code
-
- do_something(c);
-\layout LyX-Code
-
-}
-\layout Standard
-
-This code bit wil iterate through all of the subcomponents in 'comp' but
- you can select a specific type of component by changing ICAL_ANY_COMPONENT
- to another component type.
-\layout Subsubsection
-
-Using Component Iterators
-\layout Standard
-
-The iteration model in the previous section requires the component to keep
- the state of the iteration.
- So, you could not use this model to perform a sorting operations, since
- you'd need two iterators and there is only space for one.
- If you ever call icalcomponent_get_first_component() when an iteration
- is in progress, the pointer will be reset to the beginning.
-
-\layout Standard
-
-To solve this problem, there are also external iterators for components.
- The routines associated with these external iterators are:
-\layout LyX-Code
-
-icalcompiter icalcomponent_begin_component(icalcomponent* component, icalcompone
-nt_kind kind);
-\layout LyX-Code
-
-icalcompiter icalcomponent_end_component(icalcomponent* component, icalcomponent
-_kind kind);
-\layout LyX-Code
-
-icalcomponent* icalcompiter_next(icalcompiter* i);
-\layout LyX-Code
-
-icalcomponent* icalcompiter_prior(icalcompiter* i);
-\layout LyX-Code
-
-icalcomponent* icalcompiter_deref(icalcompiter* i);
-\layout Standard
-
-The _begin_() and _end_() routines return a new iterator that points to
- the beginning and ending of the list of subcomponent for the given component,
- and the kind argument works like the kind argument for internal iterators.
-
-\layout Standard
-
-After creating an iterators, use _next_() and _prior_() to step forward
- and backward through the list and get the component that the iterator points
- to, and use _deref() to return the component that the iterator points to
- without moving the iterator.
- All routines will return 0 when they move to point off the end of the list.
-
-\layout Standard
-
-Here is an example of a loop using these routines:
-\layout LyX-Code
-
-for(
-\layout LyX-Code
-
- i = icalcomponent_begin_component(impl->cluster,ICAL_ANY_COMPONENT);
-
-\layout LyX-Code
-
- icalcompiter_deref(&i)!= 0;
-\layout LyX-Code
-
- icalcompiter_next(&i)
-\layout LyX-Code
-
-) {
-\layout LyX-Code
-
- icalcomponent *this = icalcompiter_deref(&i);
-\layout LyX-Code
-
-}
-\layout Subsubsection
-
-Removing Components
-\layout Standard
-
-Removing an element from a list while iterating through the list with the
- internal iterators can cause problems, since you will probably be removing
- the element that the internal iterator points to.
- The _remove() routine will keep the iterator valid by moving it to the
- next component, but in a normal loop, this will result in two advances
- per iteration, and you will remove only every other component.
- To avoid the problem, you will need to step the iterator ahead of the
- element you are going to remove, like this:
-\layout LyX-Code
-
-for(c = icalcomponent_get_first_component(parent_comp,ICAL_ANY_COMPONENT);
-
-\layout LyX-Code
-
- c != 0;
-\layout LyX-Code
-
- c = next
-\layout LyX-Code
-
-{
-\layout LyX-Code
-
- next = icalcomponent_get_next_component(parent_comp,ICAL_ANY_COMPONENT);
-\layout LyX-Code
-
- icalcomponent_remove_component(parent_comp,c);
-\layout LyX-Code
-
-}
-\layout Standard
-
-Another way to remove components is to rely on the side effect of icalcomponent_
-remove_component: if component iterator in the parent component is pointing
- to the child that will be removed, it will move the iterator to the component
- after the child.
- The following code will exploit this behavior:
-\layout LyX-Code
-
-icalcomponent_get_first_component(parent_comp,ICAL_VEVENT_COMPONENT);
-\layout LyX-Code
-
-while((c=icalcomponent_get_current_component(c)) != 0 ){
-\layout LyX-Code
-
- if(icalcomponent_isa(c) == ICAL_VEVENT_COMPONENT){
-\layout LyX-Code
-
- icalcomponent_remove_component(parent_comp,inner);
-\layout LyX-Code
-
- } else {
-\layout LyX-Code
-
- icalcomponent_get_next_component(parent_comp,ICAL_VEVENT_COMPONENT);
-
-\layout LyX-Code
-
- }
-\layout LyX-Code
-
-}
-\layout Subsubsection
-
-Working with properties and parameters
-\layout Standard
-
-Finding, iterating and removing properties works the same as it does for
- components, using the property-specific or parameter-specific interfaces:
-
-\layout LyX-Code
-
-icalproperty* icalcomponent_get_first_property(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalproperty_kind kind);
-\layout LyX-Code
-
-icalproperty* icalcomponent_get_next_property(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalproperty_kind kind);
-\layout LyX-Code
-
-void icalcomponent_add_property(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalproperty* property);
-\layout LyX-Code
-
-void icalcomponent_remove_property(
-\layout LyX-Code
-
- icalcomponent* component,
-\layout LyX-Code
-
- icalproperty* property);
-\layout Standard
-
-For parameters:
-\layout LyX-Code
-
-icalparameter* icalproperty_get_first_parameter(
-\layout LyX-Code
-
- icalproperty* prop,
-\layout LyX-Code
-
- icalparameter_kind kind);
-\layout LyX-Code
-
-icalparameter* icalproperty_get_next_parameter(
-\layout LyX-Code
-
- icalproperty* prop,
-\layout LyX-Code
-
- icalparameter_kind kind);
-\layout LyX-Code
-
-void icalproperty_add_parameter(
-\layout LyX-Code
-
- icalproperty* prop,
-\layout LyX-Code
-
- icalparameter* parameter);
-\layout LyX-Code
-
-void icalproperty_remove_parameter(
-\layout LyX-Code
-
- icalproperty* prop,
-\layout LyX-Code
-
- icalparameter_kind kind);
-\layout Standard
-
-Note that since there should be only one parameter of each type in a property,
- you will rarely need to use icalparameter_get_nect_paameter.
-\layout Subsubsection
-
-Working with values
-\layout Standard
-
-Values are typically part of a property, although they can exist on their
- own.
- You can manipulate them either as part of the property or independently.
-\layout Standard
-
-The most common way to work with values to is to manipulate them from they
- properties that contain them.
- This involves fewer routine calls and intermediate variables than working
- with them independently, and it is type-safe.
-
-\layout Standard
-
-For each property, there are a _get_ and a _set_ routine that access the
- internal value.
- For instanace, for the UID property, the routines are:
-\layout LyX-Code
-
-void icalproperty_set_uid(icalproperty* prop, const char* v)
-\layout LyX-Code
-
-const char* icalproperty_get_uid(icalproperty* prop)
-\layout Standard
-
-For multi-valued properties, like ATTACH, the value type is usually a struct
- or union that holds both possible types.
-
-\layout Standard
-
-If you want to work with the underlying value object, you can get and set
- it with:
-\layout LyX-Code
-
-icalvalue* icalproperty_get_value (icalproperty* prop)
-\layout LyX-Code
-
-void icalproperty_set_value(icalproperty* prop, icalvalue* value);
-\layout Standard
-
-Icalproperty_get_value() will return a reference that you can manipulate
- with other icalvalue routines.
- Most of the time, you will have to know what the type of the value is.
- For instance, if you know that the value is a DATETIME type, you can manipulate
- it with:
-\layout LyX-Code
-
-struct icaltimetype icalvalue_get_datetime(icalvalue* value);
-\layout LyX-Code
-
-void icalvalue_set_datetime(icalvalue* value, struct icaltimetype v);
-\layout Standard
-
-When working with an extension property or value (and X-PROPERTY or a property
- that has the parameter VALUE=x-name ) the value type is always a string.
- To get and set the value, use:
-\layout LyX-Code
-
-void icalproperty_set_x(icalproperty* prop, char* v);
-\layout LyX-Code
-
-char* icalproperty_get_x(icalproperty* prop);
-\layout Standard
-
-All X properties have the type of ICAL_X_PROPERTY, so you will need these
- routines to get and set the name of the property:
-\layout LyX-Code
-
-char* icalproperty_get_x_name(icalproperty* prop)
-\layout LyX-Code
-
-void icalproperty_set_x_name(icalproperty* prop, char* name);
-\layout Subsubsection
-
-Checking Component Validity
-\layout Standard
-
-RFC 2446 defines rules for what properties must exist in a component to
- be used for transferring scheduling data.
- Most of these rules relate to the existence of properties relative to the
- METHOD property, which declares what operation a remote receiver should
- use to process a component.
- For instance, if the METHOD is REQUEST and the component is a VEVENT, the
- sender is probably asking the receiver to join in a meeting.
- In this case, RFC2446 says that the component must specify a start time
- (DTSTART) and list the receiver as an attendee (ATTENDEE).
-
-\layout Standard
-
-Libical can check these restrictions with the routine:
-\layout LyX-Code
-
-int icalrestriction_check(icalcomponent* comp);
-\layout Standard
-
-This routine returns 0 if the component does not pass RFC2446 restrictions,
- or if the component is malformed.
- The component you pass in
-\emph on
-must
-\emph default
- be a VCALENDAR, with one or more children, like the examples in RFC2446.
-
-\layout Standard
-
-When this routine runs, it will insert new properties into the component
- to indicate any errors it finds.
- See section 6.5.3, X-LIC-ERROR for more information about these error properties.
-
-\layout Subsubsection
-
-Converting Components to Text
-\layout Standard
-
-To create an RFC2445 compliant text representation of an object, use one
- of the *_as_ical_string() routines:
-\layout LyX-Code
-
-char* icalcomponent_as_ical_string (icalcomponent* component)
-\layout LyX-Code
-
-char* icalproperty_as_ical_string (icalproperty* property)
-\layout LyX-Code
-
-char* icalparameter_as_ical_string (icalparameter* parameter)
-\layout LyX-Code
-
-char* icalvalue_as_ical_string (icalvalue* value)
-\layout Standard
-
-In most cases, you will only use icalcomponent_as_ical_string (), since
- it will cascade and convert all of the parameters, properties and values
- that are attached to the root component.
-\layout Standard
-
-Icalproperty_as_ical_string() will terminate each line with the RFC2445
- specified line terminator
-\begin_inset Quotes eld
-\end_inset
-
-
-\backslash
-
-\backslash
-n
-\begin_inset Quotes erd
-\end_inset
-
- However, if you compile with the symbol ICAL_UNIX_NEWLINE undefined, (
- it is defined by default) it will terminate lines with
-\begin_inset Quotes eld
-\end_inset
-
-
-\backslash
-
-\backslash
-n
-\backslash
-
-\backslash
-r
-\begin_inset Quotes erd
-\end_inset
-
-
-\layout Standard
-
-Remember that the string returned by these routines is owned by the library,
- and will eventually be re-written.
- You should copy it if you want to preserve it.
-
-\layout Subsection
-
-Time
-\layout Subsubsection
-
-Time structure
-\layout Standard
-
-LIbical defines it's own time structure for storing all dates and times.
- It would have been nice to re-use the C library's
-\emph on
-struct tm,
-\emph default
-but that structure does not differentiate between dates and times, and between
- local time and UTC.
- The libical structure is:
-\layout LyX-Code
-
-struct icaltimetype {
-\layout LyX-Code
-
- int year;
-\layout LyX-Code
-
- int month;
-\layout LyX-Code
-
- int day;
-\layout LyX-Code
-
- int hour;
-\layout LyX-Code
-
- int minute;
-\layout LyX-Code
-
- int second;
-\layout LyX-Code
-
- int is_utc; /* 1-> time is in UTC timezone */
-\layout LyX-Code
-
- int is_date; /* 1 -> interpret this as date.
- */ };
-\layout Standard
-
-The year, month, day, hour, minute and second fields hold the broken-out
- time values.
- The is_utc field distinguishes between times in UTC and a local time zone.
- The is_date field indicates if the time should be interpreted only as a
- date.
- If it is a date, the hour, minute and second fields are assumed to be zero,
- regardless of their actual vaules.
-
-\layout Subsubsection
-
-Creating time structures
-\layout Standard
-
-There are several ways to create a new icaltimetype structure:
-\layout LyX-Code
-
-struct icaltimetype icaltime_from_string(const char* str);
-\layout LyX-Code
-
-struct icaltimetype icaltime_from_timet(time_t v, int is_date);
-\layout LyX-Code
-
-\layout Standard
-
-Icaltime_from_string takes any RFC2445 compliant time string:
-\layout LyX-Code
-
-struct icaltimetype tt = icaltime_from_string("19970101T103000");
-\layout Standard
-
-Icaltime_from_timet takes a timet value, representing seconds past the POSIX
- epoch, and a flag to indicate if the time is a date.
- Dates have an identical structure to a time, but the time portion ( hours,
- minuts and seconds ) is always 00:00:00.
- Dates act differently in sorting an comparision, and they have a different
- string representation in RFC2445.
-
-\layout Subsubsection
-
-Time manipulating routines
-\layout Standard
-
-The null time value is used to indicate that the data in the structure is
- not a valid time.
-\layout LyX-Code
-
-struct icaltimetype icaltime_null_time(void);
-\layout LyX-Code
-
-int icaltime_is_null_time(struct icaltimetype t);
-\layout Standard
-
-It is sensible for the broken-out time fields to contain values that are
- not permitted in an ISO compliant time string.
- For instance, the seconds field can hold values greater than 59, and the
- hours field can hold values larger than 24.
- The excessive values will be rolled over into the next larger field when
- the structure is normalized.
-
-\layout LyX-Code
-
-struct icaltimetype icaltime_normalize(struct icaltimetype t);
-\layout Standard
-
-Normalizing allows you to do arithmetic operations on time values.
-
-\layout LyX-Code
-
-struct icaltimetype tt = icaltime_from_string(
-\begin_inset Quotes eld
-\end_inset
-
-19970101T103000
-\begin_inset Quotes erd
-\end_inset
-
-);
-\layout LyX-Code
-
-tt.days +=3
-\layout LyX-Code
-
-tt.second += 70;
-\layout LyX-Code
-
-tt = icaltime_normalize(tt);
-\layout Standard
-
-There are several routines to get the day of the week or month, etc, from
- a time structure.
-\layout LyX-Code
-
-short icaltime_day_of_year(struct icaltimetype t);
-\layout LyX-Code
-
-struct icaltimetype icaltime_from_day_of_year(short doy, short year);
-\layout LyX-Code
-
-short icaltime_day_of_week(struct icaltimetype t);
-\layout LyX-Code
-
-short icaltime_start_doy_of_week(struct icaltimetype t);
-\layout LyX-Code
-
-short icaltime_week_number(short day_of_month, short month, short year);
-\layout LyX-Code
-
-struct icaltimetype icaltime_from_week_number(short week_number, short year);
-\layout LyX-Code
-
-short icaltime_days_in_month(short month,short year);
-\layout Standard
-
-Two routines convert time structures to and from the number of seconds since
- the POSIX epoch.
- The is_date field indicates whether or not the hour, minute and second
- fields should be used in the conversion.
-\layout LyX-Code
-
-struct icaltimetype icaltime_from_timet(time_t v, int is_date);
-\layout LyX-Code
-
-time_t icaltime_as_timet(struct icaltimetype);
-\layout Standard
-
-The compare routine works exactly like strcmp, but on time structures.
-
-\layout LyX-Code
-
-int icaltime_compare(struct icaltimetype a,struct icaltimetype b);
-\layout Standard
-
-The following routines convert between UTC and a named timezone.
- The tzid field must be a timezone name from the Olsen database, such as
-
-\begin_inset Quotes eld
-\end_inset
-
-America/Los_Angeles.
-\begin_inset Quotes erd
-\end_inset
-
-
-\layout Standard
-
-The utc_offset routine returns the offset of the named time zone from UTC,
- in seconds.
-
-\layout Standard
-
-The tt parameter in the following routines indicates the date on which the
- conversion should be made.
- The tt parameter is necessary because timezones have many different rules
- for when daylight savings time is used, and these rules can change over
- time.
- So, for a single timezone one year may have daylight savings time on March
- 15, but for other years March 15 may be standard time, and some years may
- have standard time all year.
-
-\layout LyX-Code
-
-int icaltime_utc_offset(struct icaltimetype tt, char* tzid);
-\layout LyX-Code
-
-int icaltime_local_utc_offset();
-\layout LyX-Code
-
-struct icaltimetype icaltime_as_utc(struct icaltimetype tt,char* tzid);
-\layout LyX-Code
-
-struct icaltimetype icaltime_as_zone(struct icaltimetype tt,char* tzid);
-\layout LyX-Code
-
-struct icaltimetype icaltime_as_local(struct icaltimetype tt);
-\layout Subsection
-
-Storing Objects
-\layout Standard
-
-The libical distribution includes a separate library, libicalss, that allows
- you to store iCal component data to disk in a variety of ways.
- This library also includes code to implement the CSTP protocol of CAP and
- has some routines for deciphering incomming messages.
-
-\layout Standard
-
-The file storage routines are organized in an inheritance heirarchy that
- is rooted in icalset, with the derived class icalfileset and icaldirset.
- Icalfileset stores components to a file, while icaldirset stores components
- to multiple files, one per month based on DTSTAMP.
- Other storages classess, for storage to a heap or a mysql database are
- planned for the future.
-
-\layout Standard
-
-All of the icalset derived classes have the same interface:
-\layout LyX-Code
-
-\layout LyX-Code
-
-icaldirset* icaldirset_new(const char* path);
-\layout LyX-Code
-
-void icaldirset_free(icaldirset* store);
-\layout LyX-Code
-
-const char* icaldirset_path(icaldirset* store);
-\layout LyX-Code
-
-void icaldirset_mark(icaldirset* store);
-\layout LyX-Code
-
-icalerrorenum icaldirset_commit(icaldirset* store);
-\layout LyX-Code
-
-icalerrorenum icaldirset_add_component(icaldirset* store, icalcomponent*
- comp);
-\layout LyX-Code
-
-icalerrorenum icaldirset_remove_component(icaldirset* store, icalcomponent*
- comp);
-\layout LyX-Code
-
-int icaldirset_count_components(icaldirset* store, icalcomponent_kind kind);
-\layout LyX-Code
-
-icalerrorenum icaldirset_select(icaldirset* store, icalcomponent* gauge);
-\layout LyX-Code
-
-void icaldirset_clear(icaldirset* store);
-\layout LyX-Code
-
-icalcomponent* icaldirset_fetch(icaldirset* store, const char* uid);
-\layout LyX-Code
-
-int icaldirset_has_uid(icaldirset* store, const char* uid);
-\layout LyX-Code
-
-icalcomponent* icaldirset_fetch_match(icaldirset* set, icalcomponent *c);
-\layout LyX-Code
-
-icalerrorenum icaldirset_modify(icaldirset* store, icalcomponent *oldc,
- icalcomponent *newc);
-\layout LyX-Code
-
-icalcomponent* icaldirset_get_current_component(icaldirset* store);
-\layout LyX-Code
-
-icalcomponent* icaldirset_get_first_component(icaldirset* store);
-\layout LyX-Code
-
-icalcomponent* icaldirset_get_next_component(icaldirset* store);
-\layout Subsubsection
-
-Creating a new set
-\layout Standard
-
-You can create a new set from either the base class or the direved class.
- From the base class use one of:
-\layout LyX-Code
-
-icalset* icalset_new_file(const char* path);
-\layout LyX-Code
-
-icalset* icalset_new_dir(const char* path);
-\layout LyX-Code
-
-icalset* icalset_new_heap(void);
-\layout LyX-Code
-
-icalset* icalset_new_mysql(const char* path);
-\layout Standard
-
-You can also create a new set based on the derived class, For instance,
- with icalfileset:
-\layout LyX-Code
-
-icalfileset* icalfileset_new(const char* path);
-\layout LyX-Code
-
-icalfileset* icalfileset_new_open(const char* path, int flags, mode_t mode);
-\layout Standard
-
-Icaset_new_file is identical to icalfileset_new.
- BOth routines will open an existing file for readinga and writing, or create
- a new file if it does not exist.
- Icalfilset_new_open takes the same arguments as the open() system routine
- and behaves in the same way.
-
-\layout Standard
-
-The icalset and icalfilset objects are somewhat interchangable -- you can
- use an icalfileset* as an argument to any of the icalset routines.
-\layout Standard
-
-The following examples will all use icalfileset routines; using the other
- icalset derived classess will be similar.
-
-\layout Subsubsection
-
-Adding, Finding and Removing Components
-\layout Standard
-
-To add components to a set, use:
-\layout LyX-Code
-
-icalerrorenum icalfileset_add_component(icalfileset* cluster, icalcomponent*
- child);
-\layout Standard
-
-The fileset keeps an inmemory copy of the components, and this set must
- be written back to the file ocassionally.
- There are two routines to manage this:
-\layout LyX-Code
-
-void icalfileset_mark(icalfileset* cluster);
-\layout LyX-Code
-
-icalerrorenum icalfileset_commit(icalfileset* cluster);
-\layout Standard
-
-Icalfileset_mark indicates that the in-memory components have changed.
- Calling the _add_component routine will call _mark automatically, but you
- may need to call it yourself if you have made a change to an existing component.
- The _commit routine writes the data base to disk, but only if it is marked.
- The _commit routine is called automatically when the icalfileset is freed.
-
-\layout Standard
-
-To iterate through the components in a set, use:
-\layout LyX-Code
-
-icalcomponent* icalfileset_get_first_component(icalfileset* cluster);
-\layout LyX-Code
-
-icalcomponent* icalfileset_get_next_component(icalfileset* cluster);
-\layout LyX-Code
-
-icalcomponent* icalfileset_get_current_component (icalfileset* cluster);
-
-\layout Standard
-
-These routines work like the corresponding routines from icalcomponent,
- except that their output is filtered through a gauge.
- A gauge is a test for the properties within a components; only components
- that pass the test are returned.
- A gauge can be constructed from a MINSQL string with:
-\layout LyX-Code
-
-icalgauge* icalgauge_new_from_sql(char* sql);
-\layout Standard
-
-Then, you can add the gauge to the set with :
-\layout LyX-Code
-
-icalerrorenum icalfileset_select(icalfileset* store, icalgauge* gauge);
-\layout Standard
-
-Here is an example that puts all of these routines together:
-\layout LyX-Code
-
-
-\latex no_latex
-void test_fileset()
-\layout LyX-Code
-
-
-\latex no_latex
-{
-\layout LyX-Code
-
-
-\latex no_latex
- icalfileset *fs;
-\layout LyX-Code
-
-
-\latex no_latex
- icalcomponent *c;
-\layout LyX-Code
-
-
-\latex no_latex
- int i;
-\layout LyX-Code
-
-
-\latex no_latex
- char *path = "test_fileset.ics";
-\layout LyX-Code
-
-
-\latex no_latex
- icalgauge *g = icalgauge_new_from_sql(
-\layout LyX-Code
-
-
-\latex no_latex
- "SELECT * FROM VEVENT WHERE DTSTART > '20000103T120000Z' AND DTSTART
- <= '20000106T120000Z'");
-\layout LyX-Code
-
-
-\latex no_latex
-
-\layout LyX-Code
-
-
-\latex no_latex
-fs = icalfileset_new(path);
-\layout LyX-Code
-
-
-\layout LyX-Code
-
-
-\latex no_latex
-for (i = 0; i!= 10; i++){
-\layout LyX-Code
-
-
-\latex no_latex
- c = make_component(i);
-\latex default
- /* Make a new component where DTSTART has month of i */
-\layout LyX-Code
-
-
-\latex no_latex
- icalfileset_add_component(fs,c);
-\layout LyX-Code
-
-
-\latex no_latex
- }
-\layout LyX-Code
-
-\layout LyX-Code
-
-
-\latex no_latex
- icalfileset_commit(fs);
-\latex default
- /* Write to disk */
-\layout LyX-Code
-
-\layout LyX-Code
-
-
-\latex no_latex
- icalfileset_select(fs,g);
-\latex default
- /* Set the gauge to filter components */
-\layout LyX-Code
-
-
-\latex no_latex
-
-\layout LyX-Code
-
-
-\latex no_latex
- for (c = icalfileset_get_first_component(fs);
-\layout LyX-Code
-
-
-\latex no_latex
- c != 0;
-\layout LyX-Code
-
-
-\latex no_latex
- c = icalfileset_get_next_component(fs)){
-\layout LyX-Code
-
-
-\latex no_latex
- struct icaltimetype t = icalcomponent_get_dtstart(c);
-\layout LyX-Code
-
-
-\latex no_latex
-
-\layout LyX-Code
-
-
-\latex no_latex
- printf("%s
-\backslash
-n",icaltime_as_ctime(t));
-\layout LyX-Code
-
-
-\latex no_latex
- }
-\layout LyX-Code
-
-
-\latex no_latex
-icalfileset_free(fs);
-\layout LyX-Code
-
-
-\latex no_latex
-}
-\layout Subsubsection
-
-Other routines
-\layout Standard
-
-There are several other routines in the icalset interface, but they not
- fully implemented yet.
-
-\layout Subsection
-
-
-\begin_inset LatexCommand \label{sec:memory}
-
-\end_inset
-
-Memory Management
-\layout Standard
-
-Libical relies heavily on dynamic allocation for both the core objects and
- for the strings used to hold values.
- Some of this memory the library caller owns and must free, and some of
- the memory is managed by the library.
- Here is a summary of the memory rules.
-
-\layout Description
-
-1) If the function name has "new" in it, the caller gets control of the
- memory.
- ( such as icalcomponent_new(), or icalproperty_new_clone() )
-\layout Description
-
-2) If you got the memory from a routine with new in it, you must call the
- corresponding *_free routine to free the memory.
- ( Use icalcomponent_free() to free objects created with icalcomponent_new())
-
-\layout Description
-
-3) If the function name has "add" in it, the caller is transferring control
- of the memory to the routine.
- ( icalproperty_add_parameter() )
-\layout Description
-
-4) If the function name has "remove" in it, the caller passes in a pointer
- to an object and after the call returns, the caller owns the object.
- So, before you call icalcomponent_remove_property(comp,foo), you do not
- own "foo" and after the call returns, you do.
-
-\layout Description
-
-5) If the routine returns a string, libical owns the memory and will put
- it on a ring buffer to reclaim later.
- For example, icalcomponent_as_ical_string().
- You'd better strdup() it if you want to keep it, and you don't have to
- delete it.
-
-\layout Subsection
-
-Error Handling
-\layout Standard
-
-Libical has several error handling mechanisms for the various types of programmi
-ng, semantic and syntactic errors you may encounter.
-\layout Subsubsection
-
-Return values
-\layout Standard
-
-Many library routines signal errors through their return values.
- All routines that return a pointer, such as icalcomponent_new(), will return
- 0 ( zero ) on a fatal error.
- Some routines will return a value of enum icalerrorenum.
-
-\layout Subsubsection
-
-icalerrno
-\layout Standard
-
-Most routines will set the global error value icalerrno on errors.
- This variable is an enumeration; permissible values can be found in libical/ica
-lerror.h.
- If the routine returns an enum icalerrorenum, then the return value will
- be the same as icalerrno.
- You can use icalerror_strerror() to get a string that describes the error.
- The enumerations are:
-\layout Standard
-\added_space_top 0.3cm \added_space_bottom 0.3cm \align center \LyXTable
-multicol5
-12 2 0 0 -1 -1 -1 -1
-1 1 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 0 0 0
-1 1 0 0
-2 1 0 "" ""
-2 1 1 "" ""
-0 8 1 0 0 0 0 "" ""
-0 8 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-
-
-\newline
-
-\newline
-ICAL_BADARG_ERROR
-\newline
-One of the argument to a routine was bad.
- Typically for a null pointer.
-\newline
-ICAL_NEWFAILED_ERROR
-\newline
-A new() or malloc() failed
-\newline
-ICAL_MALFORMEDDATA_ERROR
-\newline
-An input string was not in the correct format
-\newline
-ICAL_PARSE_ERROR
-\newline
-the parser failed to parse an incomming component
-\newline
-ICAL_INTERNAL_ERROR
-\newline
-Largely equivalent to an assert; it indicates a bug in the libical code
-\newline
-ICAL_FILE_ERROR
-\newline
-A file operation failed.
- Check errno for more detai
-\newline
-ICAL_ALLOCATION_ERROR
-\newline
-
-\newline
-ICAL_NO_ERROR
-\newline
-No error has occurred
-\newline
-ICAL_TIMEDOUT_ERROR
-\newline
-Failed to acquire a lock on a file, or the CSTP protocol timed out.
-
-\newline
-ICAL_MULTIPLEINCLUSION_ERROR
-\newline
-
-\newline
-ICAL_UNKNOWN_ERROR
-\newline
-
-\layout Subsubsection
-
-X-LIC-ERROR and X-LIC-INVALID-COMPONENT
-\layout Standard
-
-The library handles semantic and syntactic errors in components by inserting
- errors properties into the components.
- If the parser cannot parse incoming text ( a syntactic error ) or if the
- icalrestriction_check() routine indicates that the component does not meet
- the requirements of RFC2446 ( a semantic error) the library will insert
- properties of the type X-LIC-ERROR to describe the error.
- Here is an example of the error property:
-\layout LyX-Code
-
-X-LIC-ERROR;X-LIC-ERRORTYPE=INVALID_ITIP :Failed iTIP restrictions for property
- DTSTART.
-
-\layout LyX-Code
-
-Expected 1 instances of the property and got 0
-\layout Standard
-
-This error resulted from a call to icalrestriction_check(), which discovered
- that the component does not have a DTSTART property, as required by RFC2445.
-
-\layout Standard
-
-There are a few routines to manipulate error properties:
-\layout Standard
-\LyXTable
-multicol5
-10 2 0 0 -1 -1 -1 -1
-1 1 0 0
-0 0 0 0
-0 1 1 0
-0 0 0 0
-0 1 1 0
-0 1 0 0
-0 1 1 0
-0 1 0 0
-0 1 1 0
-0 1 1 0
-2 1 1 "" ""
-2 1 1 "3in" ""
-0 2 1 1 0 0 0 "" ""
-0 8 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 1 0 1 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 1 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 1 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 1 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 1 1 0 1 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 1 1 0 1 "" ""
-0 2 1 0 0 0 0 "" ""
-0 2 1 1 0 0 1 "" ""
-
-Routine
-\newline
-Purpose
-\newline
-void icalrestriction_check()
-\newline
-Check a component against RFC2446 and insert
-\newline
-
-\newline
-error properties to indicate non compliance
-\newline
-int icalcomponent_count_errors()
-\newline
-Return the number of error properties
-\newline
-
-\newline
-in a component
-\newline
-void icalcomponent_strip_errors()
-\newline
-Remove all error properties in as
-\newline
-
-\newline
-component
-\newline
-void icalcomponent_convert_errors()
-\newline
-Convert some error properties into
-\newline
-
-\newline
-REQUESTS-STATUS proprties to indicate the inability to
-\newline
-
-\newline
-process the component as an iTIP request.
-
-\layout Standard
-
-The types of errors are listed in icalerror.h.
- They are:
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_COMPONENTPARSEERROR
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_PARAMETERVALUEPARSEERROR
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_PARAMETERNAMEPARSEERROR
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_PROPERTYPARSEERROR
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_VALUEPARSEERROR
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_UNKVCALPROP
-\layout LyX-Code
-
-ICAL_XLICERRORTYPE_INVALIDITIP
-\layout Standard
-
-The libical parser will generate the error that end in PARSEERROR when it
- encounters garbage in the input steam.
- ICAL_XLICERRORTYPE_INVALIDITIP is inserted by icalrestriction_check(),
- and ICAL_XLICERRORTYPE_UNKVCALPROP is generated by icalvcal_convert() when
- it encounters a vCal property that it cannot convert or does not know about.
-
-\layout Standard
-
-Icalcomponent_convert_errors() converts some of the error properties in
- a component into REQUEST-STATUS properties that indicate a failure.
- As of libical version0.18, this routine only convert *PARSEERROR errors
- and it always generates a 3.x ( failure ) code.
- This makes it more of a good idea than a really useful bit of code.
-
-\layout Subsubsection
-
-ICAL_ERRORS_ARE_FATAL and icalerror_errors_are_fatal
-\layout Standard
-
-If the global variable icalerror_errors_are_fatal is set to 1, then any
- error condition will cause the program to abort.
- The abort occurs in icalerror_set_errno(), and is done with an assert(0)
- if NDEBUG is undefined, and with icalerror_crash_here if NDEBUG is defined.
- The default value of icalerror_errors_are_fatal is 1 when ICAL_ERRORS_ARE_FATAL
- is defined, and 0 otherwise.
- Since ICAL_ERRORS_ARE_FATAL is defined by default, icalerror_errors_are_fatal
- is also defined by default.
-
-\layout Subsection
-
-Naming Standard
-\layout Standard
-
-Structures that you access with the
-\begin_inset Quotes eld
-\end_inset
-
-struct
-\begin_inset Quotes erd
-\end_inset
-
- keyword, such as
-\begin_inset Quotes eld
-\end_inset
-
-struct icaltimetype
-\begin_inset Quotes erd
-\end_inset
-
- are things that you are allowed to see inside and poke at.
-
-\layout Standard
-
-Structures that you access though a typedef, such as
-\begin_inset Quotes eld
-\end_inset
-
-icalcomponent
-\begin_inset Quotes erd
-\end_inset
-
- are things where all of the data is hidden.
-
-\layout Standard
-
-Component names that start with
-\begin_inset Quotes eld
-\end_inset
-
-V
-\begin_inset Quotes erd
-\end_inset
-
- are part of RFC 2445 or another iCal standard.
- Component names that start with
-\begin_inset Quotes eld
-\end_inset
-
-X
-\begin_inset Quotes erd
-\end_inset
-
- are also part of the spec, but they are not actually components in the
- spec.
- However, they look and act like components, so they are components in libical.
- Names that start with
-\begin_inset Quotes eld
-\end_inset
-
-XLIC
-\begin_inset Quotes erd
-\end_inset
-
- or
-\begin_inset Quotes eld
-\end_inset
-
-X-LIC
-\begin_inset Quotes erd
-\end_inset
-
- are not part of any iCal spec.
- They are used internally by libical.
-
-\layout Standard
-
-Enums that identify a component, property, value or parameter end with
-\begin_inset Quotes eld
-\end_inset
-
-_COMPONENT,
-\begin_inset Quotes erd
-\end_inset
-
-
-\begin_inset Quotes eld
-\end_inset
-
-_PROPERTY,
-\begin_inset Quotes erd
-\end_inset
-
-
-\begin_inset Quotes eld
-\end_inset
-
-_VALUE,
-\begin_inset Quotes erd
-\end_inset
-
- or
-\begin_inset Quotes eld
-\end_inset
-
-_PARAMETER
-\begin_inset Quotes erd
-\end_inset
-
-s
-\layout Standard
-
-Enums that identify a parameter value have the name of the parameter as
- the second word.
- For instance: ICAL_ROLE_REQPARTICIPANT or ICAL_PARTSTAT_ACCEPTED.
-\layout Standard
-
-The enums for the parts of a recurarance rule and request statuses are irregular.
-
-\layout Section
-
-Hacks and Bugs
-\layout Standard
-
-There are a lot of hacks in the library -- bits of code that I am not proud
- of and should probably be changed.
- These are marked with the comment string
-\begin_inset Quotes eld
-\end_inset
-
-HACK.
-\begin_inset Quotes erd
-\end_inset
-
-
-\the_end
diff --git a/libkcal/libical/doc/UsingLibical.ps b/libkcal/libical/doc/UsingLibical.ps
deleted file mode 100644
index 6223144e3..000000000
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+++ /dev/null
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diff --git a/libkcal/libical/doc/UsingLibical.txt b/libkcal/libical/doc/UsingLibical.txt
deleted file mode 100644
index 6b203d43d..000000000
--- a/libkcal/libical/doc/UsingLibical.txt
+++ /dev/null
@@ -1,1384 +0,0 @@
-
-
-Using Libical
-
-Eric Busboom (eric@softwarestudio.org)
-
-January 2001
-
-
-
-1 Introduction
-
-Libical is an Open Source implementation of the iCalendar protocols
-and protocol data units. The iCalendar specification describes how
-calendar clients can communicate with calendar servers so users can
-store their calendar data and arrange meetings with other users.
-
-Libical implements RFC2445, RFC2446 and some of RFC2447 and the CAP
-draft.
-
-This documentation assumes that you are familiar with the iCalendar
-standards RFC2445 and RFC2446. these specifications are online on
-the CALSCH webpage at:
-
-http://www.imc.org/ietf-calendar/
-
-1.1 The libical project
-
-This code is under active development. If you would like to contribute
-to the project, you can contact me, Eric Busboom, at eric@softwarestudio.org.
-The project has a webpage at
-
-http://softwarestudio.org/libical/index.html
-
-and a mailing list that you can join by sending the following mail:
-
-To: minimalist@softwarestudio.org
-
-Subject: subscribe libical
-
-1.2 License
-
-The code and datafiles in this distribution are licensed under the
-Mozilla Public License. See http://www.mozilla.org/NPL/MPL-1.0.html
-for a copy of the license. Alternately, you may use libical under
-the terms of the GNU Library General Public License. See http://www.fsf.org/copyleft/lesser.html
-for a copy of the LGPL.
-
-This dual license ensures that the library can be incorporated into
-both proprietary code and GPL'd programs, and will benefit from improvements
-made by programmers in both realms. I will only accept changes into
-my version of the library if they are similarly dual-licensed.
-
-1.3 Example Code
-
-A lot of the documentation for this library is in the form of example
-code. These examples are in the "examples" directory of the distribution.
-Also look in "src/test" for additional annotated examples.
-
-2 Building the Library
-
-Libical uses autoconf to generate makefiles. It should built with no
-adjustments on Linux, FreeBSD and Solaris under gcc. Some version
-have been successfully been build on MacOS, Solaris, UnixWare, And
-Tru64 UNIX without gcc, but you may run into problems with a particular
-later version.
-
-For a more complete guide to building the library, see the README file
-in the distribution.
-
-3 Structure
-
-The iCal calendar model is based on four types of objects: components,
-properties, values and parameters.
-
-Properties are the fundamental unit of information in iCal, and they
-work a bit like a hash entry, with a constant key and a variable value.
-Properties may also have modifiers, called parameters. In the iCal
-content line
-
-ORGANIZER;ROLE=CHAIR:MAILTO:mrbig@host.com
-
-The property name is "ORGANIZER," the value of the property is "mrbig@host.com"
-and the "ROLE" parameter specifies that Mr Big is the chair of the
-meetings associated with this property.
-
-Components are groups of properties that represent the core objects
-of a calendar system, such as events or timezones. Components are
-delimited by "BEGIN" and "END" tags.
-
-When a component is sent across a network, if it is un-encrypted, it
-will look something like:
-
-BEGIN:VCALENDAR
-
-METHOD:REQUEST
-
-PRODID: -//hacksw/handcal//NONSGML v1.0//EN
-
-BEGIN:VEVENT
-
-DTSTAMP:19980309T231000Z
-
-UID:guid-1.host1.com
-
-ORGANIZER;ROLE=CHAIR:MAILTO:mrbig@host.com
-
-ATTENDEE;RSVP=TRUE;ROLE=REQ-PARTICIPANT;CUTYPE=GROUP:
-
- MAILTO:employee-A@host.com
-
-DESCRIPTION:Project XYZ Review Meeting
-
-CATEGORIES:MEETING
-
-CLASS:PUBLIC
-
-CREATED:19980309T130000Z
-
-SUMMARY:XYZ Project Review
-
-DTSTART;TZID=US-Eastern:19980312T083000
-
-DTEND;TZID=US-Eastern:19980312T093000
-
-LOCATION:1CP Conference Room 4350
-
-END:VEVENT
-
-END:VCALENDAR
-
-Note that components can be nested; this example has both a VCALENDAR
-and a VEVENT component, one nested inside the other.
-
-3.1 Core iCal classes
-
-Libical is an object-based, data-oriented library. Nearly all of the
-routines in the library are associated with an opaque data types and
-perform some operation on that data type. Although the library does
-not actually have classes, we will use those terms since the behavior
-of these associations of data and routines is very similar to a class.
-
-3.1.1 Properties
-
-Properties are represented with the icalproperty class and its many
-"derived" classes with on "derived" class per property type in RFC2445.
-Again, there is no actual inheritance relations, but there are clusters
-of routines that make this term useful. A property is a container
-for a single value and a set of parameters.
-
-3.1.2 Components
-
-In libical, components are represented with the icalcomponent class.
-Icalcomponent is a container for a set of other components and properties.
-
-3.1.3 Values
-
-Values are represented in a similar way to properties; a base class
-and many "derived " classes. A value is essentially a abstract handle
-on a single fundamental type, a structure or a union.
-
-3.1.4 Parameters
-
-Parameters are represetned in a similar way to properties, except that
-they contain only one value
-
-3.2 Other elements of libical
-
-In addition to the core iCal classes, libical has many other types,
-structures, classes that aid in creating and using iCal components.
-
-3.2.1 Enumerations and types
-
-Libical is strongly typed, soo every component, property, parameter,
-and value type has an enumeration, and some have an associated structure
-or union.
-
-3.2.2 The parser
-
-The libical parser offers a variety of ways to convert RFC2445 text
-into a libical iinsteral component structure. the parser can parse
-blocks of text as a string, or it can parse lin-by-line.
-
-3.2.3 Error objects
-
-Libical has a substantial error reporting system for both programming
-errors and component usage errors.
-
-3.2.4 Memory Management
-
-Since many of libicals interfaces return strings, the library has its
-own memory management system to elimiate the need to free every string
-returned from the libraru.
-
-3.2.5 Storage classes
-
-The library also offers several classes to store components to flies,
-memory or databases.
-
-4 Differences From RFCs
-
-Libical has been designed to follow the standards as closely as possible,
-so that the key objects in the standards are also key objects in the
-library. However, there are a few areas where the specifications are
-(arguably) irregular, and following them exactly would result in an
-unfriendly interface. These deviations make libical easier to use
-by maintaining a self-similar interface.
-
-4.1 Pseudo Components
-
-Libical defines components for groups of properties that look and act
-like components, but are not defined as components in the specification.
-XDAYLIGHT and XSTANDARD are notable examples. These pseudo components
-group properties within the VTIMEZONE components. For instanace, the
-timezone properties associated with daylight savings time starts with
-"BEGIN:DAYLIGHT" and ends with "END:DAYLIGHT, just like other components,
-but is not defined as a component in RFC2445. ( See RFC2445, page
-61 ) In Libical,this grouping is represented by the XDAYLIGHT component.
-Standard iCAL components all start with the letter "V," while pseudo
-components start with"X."
-
-There are also pseudo components that are conceptually derived classes
-of VALARM. RFC2446 defines what properties may be included in each
-component, and for VALARM, the set of properties it may have depends
-on the value of the ACTION property.
-
-For instance, if a VALARM component has an ACTION property with the
-value of "AUDIO," the component must also have an "ATTACH" property.
-However, if the ACTION value is "DISPLAY," the component must have
-a DESCRIPTION property.
-
-To handle these various, complex restrictions, libical has pseudo components
-for each type of alarm: XAUDIOALARM, XDISPLAYALARM, XEMAILALARM and
-XPROCEDUREALARM.
-
-4.2 Combined Values
-
-Many values can take more than one type. TRIGGER, for instance, can
-have a value type of with DURATION or of DATE-TIME. These multiple
-types make it difficult to create routines to return the value associated
-with a property.
-
-It is natural to have interfaces that would return the value of a property,
-but it is cumbersome for a single routine to return multiple types.
-So, in libical, properties that can have multiple types are given
-a single type that is the union of their RFC2445 types. For instance,
-in libical, the value of the TRIGGER property resolves to struct icaltriggertype.
-This type is a union of a DURATION and a DATE-TIME.
-
-4.3 Multi-Valued Properties
-
-Some properties, such as CATEGORIES have only one value type, but each
-CATEGORIES property can have multiple value instances. This also results
-in a cumbersome interface -- CATEGORIES accessors would have to return
-a list while all other accessors returned a single value. In libical,
-all properties have a single value, and multi-valued properties are
-broken down into multiple single valued properties during parsing.
-That is, an input line like,
-
-CATEGORIES: work, home
-
-becomes in libical's internal representation
-
-CATEGORIES: work
-
-CATEGORIES: home
-
-Oddly, RFC2445 allows some multi-valued properties ( like FREEBUSY
-) to exist as both a multi-values property and as multiple single
-value properties, while others ( like CATEGORIES ) can only exist
-as single multi-valued properties. This makes the internal representation
-for CATEGORIES illegal. However when you convert a component to a
-string, the library will collect all of the CATEGORIES properties
-into one.
-
-5 Using libical
-
-5.1 Creating Components
-
-There are three ways to create components in Libical: creating individual
-objects and assembling them, building entire objects in massive vaargs
-calls, and parsing a text file containing iCalendar data.
-
-5.1.1 Constructor Interfaces
-
-Using constructor interfaces, you create each of the objects separately
-and then assemble them in to components:
-
-icalcomponent *event;
-
-icalproperty *prop;
-
-icalparameter *param;
-
-struct icaltimetype atime;
-
-event = icalcomponent_new(ICAL_VEVENT_COMPONENT);
-
-prop = icalproperty_new_dtstamp(atime) ;
-
-icalcomponent_add_property(event, prop);
-
-prop = icalproperty_new_uid(''guid-1.host1.com'') );
-
-icalcomponent_add_property(event,prop);
-
-prop=icalproperty_new_organizer(''mrbig@host.com'');
-
-param = icalparameter_new_role(ICAL_ROLE_CHAIR)
-
-icalproperty_add_parameter(prop, param);
-
-icalcomponent_add_property(event,prop);
-
-Notice that libical uses a semi-object-oriented style of interface.
-Most things you work with are objects, that are instantiated with
-a constructor that has "new" in the name. Also note that, other than
-the object reference, most structure data is passed in to libical
-routines by value. Libical has some complex but very regular memory
-handling rules. These are detailed in section [sec:memory].
-
-If any of the constructors fail, they will return 0. If you try to
-insert 0 into a property or component, or use a zero-valued object
-reference, libical will either silently ignore the error or will abort
-with an error message. This behavior is controlled by a compile time
-flag (ICAL_ERRORS_ARE_FATAL), and will abort by default.
-
-5.1.2 vaargs Constructors
-
-There is another way to create complex components, which is arguably
-more elegant, if you are not horrified by varargs. The varargs constructor
-interface allows you to create intricate components in a single block
-of code. Here is the previous examples in the vaargs style.
-
- calendar =
-
- icalcomponent_vanew(
-
- ICAL_VCALENDAR_COMPONENT,
-
- icalproperty_new_version(''2.0''),
-
- icalproperty_new_prodid(
-
- ''-//RDU Software//NONSGML HandCal//EN''),
-
- icalcomponent_vanew(
-
- ICAL_VEVENT_COMPONENT,
-
- icalproperty_new_dtstamp(atime),
-
- icalproperty_new_uid(''guid-1.host1.com''),
-
- icalproperty_vanew_organizer(
-
- ''mrbig@host.com''),
-
- icalparameter_new_role(ICAL_ROLE_CHAIR),
-
- 0
-
- ),
-
- icalproperty_vanew_attendee(
-
- ''employee-A@host.com'',
-
- icalparameter_new_role(
-
- ICAL_ROLE_REQPARTICIPANT),
-
- icalparameter_new_rsvp(1),
-
- icalparameter_new_cutype(ICAL_CUTYPE_GROUP),
-
- 0
-
- ),
-
- icalproperty_new_location(
-
- "1CP Conference Room 4350"),
-
- 0
-
- ),
-
- 0
-
- );
-
-This form is similar to the constructor form , except that the constructors
-have "vanew" instead of "new" in the name. The arguments are similar
-too, except that the component constructor can have a list of properties,
-and the property constructor can have a list of parameters. Be sure
-to terminate every list with a '0', or your code will crash, if you
-are lucky.
-
-5.1.3 Parsing Text Files
-
-The final way to create components will probably be the most common;
-you can create components from RFC2445 compliant text. If you have
-the string in memory, use
-
-icalcomponent* icalparser_parse_string(char* str);
-
-If the string contains only one component, the parser will return the
-component in libical form. If the string contains multiple components,
-the multiple components will be returned as the children of an ICAL_XROOT_COMPONENT
-component.
-
-Parsing a whole string may seem wasteful if you want to pull a large
-component off of the network or from a file; you may prefer to parse
-the component line by line. This is possible too by using:
-
-icalparser* icalparser_new();
-
-void icalparser_free(icalparser* parser);
-
-icalparser_get_line(parser,read_stream);
-
-icalparser_add_line(parser,line);
-
-icalparser_set_gen_data(parser,stream)
-
-These routines will construct a parser object to which you can add
-lines of input and retrieve any components that the parser creates
-from the input. These routines work by specifing an adaptor routine
-to get string data from a source. For an example:
-
-char* read_stream(char *s, size_t size, void *d)
-
-{
-
- char *c = fgets(s,size, (FILE*)d);
-
- return c;
-
-}
-
-main() {
-
- char* line;
-
- icalcomponent *c;
-
- icalparser *parser = icalparser_new();
-
- FILE* stream = fopen(argv[1],"r");
-
- icalparser_set_gen_data(parser,stream);
-
- do{
-
- line = icalparser_get_line(parser,read_stream);
-
- c = icalparser_add_line(parser,line);
-
- if (c != 0){
-
- printf("%s",icalcomponent_as_ical_string(c));
-
- icalparser_claim(parser);
-
- printf("\n---------------\n");
-
- icalcomponent_free(c);
-
- }
-
- } while ( line != 0);
-
-}
-
-The parser object parameterizes the routine used to get input lines
-with icalparser_set_gen_data() and icalparser_get_line(). In this
-example, the routine read_stream() will fetch the next line from a
-stream, with the stream passed in as the void* parameter d. The parser
-calls read_stream() from icalparser_get_line(), but it also needs
-to know what stream to use. This is set by the call to icalparser_set_gen_data().
-By using a different routine for read_stream or passing in different
-data with icalparser_set_gen_data, you can connect to any data source.
-
-Using the same mechanism, other implementations could read from memory
-buffers, sockets or other interfaces.
-
-Since the example code is a very common way to use the parser, there
-is a convenience routine;
-
-icalcomponent* icalparser_parse(icalparser *parser,
-
- char* (*line_gen_func)(char *s, size_t size, void*
-d))
-
-To use this routine, you still must construct the parser object and
-pass in a reference to a line reading routine. If the parser can create
-a single component from the input, it will return a pointer to the
-newly constructed component. If the parser can construct multiple
-components from the input, it will return a reference to an XROOT
-component ( of type ICAL_XROOT_COMPONENT.) This XROOT component will
-hold all of the components constructed from the input as children.
-
-5.2 Accessing Components
-
-Given a reference to a component, you probably will want to access
-the properties, parameters and values inside. Libical interfaces let
-you find sub-component, add and remove sub-components, and do the
-same three operations on properties.
-
-5.2.1 Finding Components
-
-To find a sub-component of a component, use:
-
-icalcomponent* icalcomponent_get_first_component(
-
- icalcomponent* component,
-
- icalcomponent_kind kind);
-
-This routine will return a reference to the first component of the
-type 'kind.' The key kind values, listed in icalenums.h are:
-
-ICAL_ANY_COMPONENT
-
-ICAL_VEVENT_COMPONENT
-
-ICAL_VTODO_COMPONENT
-
-ICAL_VJOURNAL_COMPONENT
-
-ICAL_VCALENDAR_COMPONENT
-
-ICAL_VFREEBUSY_COMPONENT
-
-ICAL_VALARM_COMPONENT
-
-These are only the most common components; there are many more listed
-in icalenums.h.
-
-As you might guess, if there is more than one subcomponent of the type
-you have chosen, this routine will return only the first. to get at
-the others, you need to iterate through the component.
-
-5.2.2 Iterating Through Components
-
-Iteration requires a second routine to get the next subcomponent after
-the first:
-
-icalcomponent* icalcomponent_get_next_component(
-
- icalcomponent* component,
-
- icalcomponent_kind kind);
-
-With the 'first' and 'next' routines, you can create a for loop to
-iterate through all of a components subcomponents
-
- for(c = icalcomponent_get_first_component(comp,ICAL_ANY_COMPONENT);
-
- c != 0;
-
- c = icalcomponent_get_next_component(comp,ICAL_ANY_COMPONENT))
-
-{
-
- do_something(c);
-
-}
-
-This code bit wil iterate through all of the subcomponents in 'comp'
-but you can select a specific type of component by changing ICAL_ANY_COMPONENT
-to another component type.
-
-5.2.3 Using Component Iterators
-
-The iteration model in the previous section requires the component
-to keep the state of the iteration. So, you could not use this model
-to perform a sorting operations, since you'd need two iterators and
-there is only space for one. If you ever call icalcomponent_get_first_component()
-when an iteration is in progress, the pointer will be reset to the
-beginning.
-
-To solve this problem, there are also external iterators for components.
-The routines associated with these external iterators are:
-
-icalcompiter icalcomponent_begin_component(icalcomponent* component,
-icalcomponent_kind kind);
-
-icalcompiter icalcomponent_end_component(icalcomponent* component,
-icalcomponent_kind kind);
-
-icalcomponent* icalcompiter_next(icalcompiter* i);
-
-icalcomponent* icalcompiter_prior(icalcompiter* i);
-
-icalcomponent* icalcompiter_deref(icalcompiter* i);
-
-The _begin_() and _end_() routines return a new iterator that points
-to the beginning and ending of the list of subcomponent for the given
-component, and the kind argument works like the kind argument for
-internal iterators.
-
-After creating an iterators, use _next_() and _prior_() to step forward
-and backward through the list and get the component that the iterator
-points to, and use _deref() to return the component that the iterator
-points to without moving the iterator. All routines will return 0
-when they move to point off the end of the list.
-
-Here is an example of a loop using these routines:
-
-for(
-
- i = icalcomponent_begin_component(impl->cluster,ICAL_ANY_COMPONENT);
-
- icalcompiter_deref(&i)!= 0;
-
- icalcompiter_next(&i)
-
-) {
-
- icalcomponent *this = icalcompiter_deref(&i);
-
-}
-
-5.2.4 Removing Components
-
-Removing an element from a list while iterating through the list with
-the internal iterators can cause problems, since you will probably
-be removing the element that the internal iterator points to. The
-_remove() routine will keep the iterator valid by moving it to the
-next component, but in a normal loop, this will result in two advances
-per iteration, and you will remove only every other component. To
-avoid the problem, you will need to step the iterator ahead of the
-element you are going to remove, like this:
-
-for(c = icalcomponent_get_first_component(parent_comp,ICAL_ANY_COMPONENT);
-
- c != 0;
-
- c = next
-
-{
-
- next = icalcomponent_get_next_component(parent_comp,ICAL_ANY_COMPONENT);
-
- icalcomponent_remove_component(parent_comp,c);
-
-}
-
-Another way to remove components is to rely on the side effect of icalcomponent_remove_component:
-if component iterator in the parent component is pointing to the child
-that will be removed, it will move the iterator to the component after
-the child. The following code will exploit this behavior:
-
-icalcomponent_get_first_component(parent_comp,ICAL_VEVENT_COMPONENT);
-
-while((c=icalcomponent_get_current_component(c)) != 0 ){
-
- if(icalcomponent_isa(c) == ICAL_VEVENT_COMPONENT){
-
- icalcomponent_remove_component(parent_comp,inner);
-
- } else {
-
- icalcomponent_get_next_component(parent_comp,ICAL_VEVENT_COMPONENT);
-
- }
-
-}
-
-5.2.5 Working with properties and parameters
-
-Finding, iterating and removing properties works the same as it does
-for components, using the property-specific or parameter-specific
-interfaces:
-
-icalproperty* icalcomponent_get_first_property(
-
- icalcomponent* component,
-
- icalproperty_kind kind);
-
-icalproperty* icalcomponent_get_next_property(
-
- icalcomponent* component,
-
- icalproperty_kind kind);
-
-void icalcomponent_add_property(
-
- icalcomponent* component,
-
- icalproperty* property);
-
-void icalcomponent_remove_property(
-
- icalcomponent* component,
-
- icalproperty* property);
-
-For parameters:
-
-icalparameter* icalproperty_get_first_parameter(
-
- icalproperty* prop,
-
- icalparameter_kind kind);
-
-icalparameter* icalproperty_get_next_parameter(
-
- icalproperty* prop,
-
- icalparameter_kind kind);
-
-void icalproperty_add_parameter(
-
- icalproperty* prop,
-
- icalparameter* parameter);
-
-void icalproperty_remove_parameter(
-
- icalproperty* prop,
-
- icalparameter_kind kind);
-
-Note that since there should be only one parameter of each type in
-a property, you will rarely need to use icalparameter_get_nect_paameter.
-
-5.2.6 Working with values
-
-Values are typically part of a property, although they can exist on
-their own. You can manipulate them either as part of the property
-or independently.
-
-The most common way to work with values to is to manipulate them from
-they properties that contain them. This involves fewer routine calls
-and intermediate variables than working with them independently, and
-it is type-safe.
-
-For each property, there are a _get_ and a _set_ routine that access
-the internal value. For instanace, for the UID property, the routines
-are:
-
-void icalproperty_set_uid(icalproperty* prop, const char* v)
-
-const char* icalproperty_get_uid(icalproperty* prop)
-
-For multi-valued properties, like ATTACH, the value type is usually
-a struct or union that holds both possible types.
-
-If you want to work with the underlying value object, you can get and
-set it with:
-
-icalvalue* icalproperty_get_value (icalproperty* prop)
-
-void icalproperty_set_value(icalproperty* prop, icalvalue* value);
-
-Icalproperty_get_value() will return a reference that you can manipulate
-with other icalvalue routines. Most of the time, you will have to
-know what the type of the value is. For instance, if you know that
-the value is a DATETIME type, you can manipulate it with:
-
-struct icaltimetype icalvalue_get_datetime(icalvalue* value);
-
-void icalvalue_set_datetime(icalvalue* value, struct icaltimetype v);
-
-When working with an extension property or value (and X-PROPERTY or
-a property that has the parameter VALUE=x-name ) the value type is
-always a string. To get and set the value, use:
-
-void icalproperty_set_x(icalproperty* prop, char* v);
-
-char* icalproperty_get_x(icalproperty* prop);
-
-All X properties have the type of ICAL_X_PROPERTY, so you will need
-these routines to get and set the name of the property:
-
-char* icalproperty_get_x_name(icalproperty* prop)
-
-void icalproperty_set_x_name(icalproperty* prop, char* name);
-
-5.2.7 Checking Component Validity
-
-RFC 2446 defines rules for what properties must exist in a component
-to be used for transferring scheduling data. Most of these rules relate
-to the existence of properties relative to the METHOD property, which
-declares what operation a remote receiver should use to process a
-component. For instance, if the METHOD is REQUEST and the component
-is a VEVENT, the sender is probably asking the receiver to join in
-a meeting. In this case, RFC2446 says that the component must specify
-a start time (DTSTART) and list the receiver as an attendee (ATTENDEE).
-
-Libical can check these restrictions with the routine:
-
-int icalrestriction_check(icalcomponent* comp);
-
-This routine returns 0 if the component does not pass RFC2446 restrictions,
-or if the component is malformed. The component you pass in must be
-a VCALENDAR, with one or more children, like the examples in RFC2446.
-
-When this routine runs, it will insert new properties into the component
-to indicate any errors it finds. See section 6.5.3, X-LIC-ERROR for
-more information about these error properties.
-
-5.2.8 Converting Components to Text
-
-To create an RFC2445 compliant text representation of an object, use
-one of the *_as_ical_string() routines:
-
-char* icalcomponent_as_ical_string (icalcomponent* component)
-
-char* icalproperty_as_ical_string (icalproperty* property)
-
-char* icalparameter_as_ical_string (icalparameter* parameter)
-
-char* icalvalue_as_ical_string (icalvalue* value)
-
-In most cases, you will only use icalcomponent_as_ical_string (), since
-it will cascade and convert all of the parameters, properties and
-values that are attached to the root component.
-
-Icalproperty_as_ical_string() will terminate each line with the RFC2445
-specified line terminator "\\n" However, if you compile with the symbol
-ICAL_UNIX_NEWLINE undefined, ( it is defined by default) it will terminate
-lines with "\\n\\r"
-
-Remember that the string returned by these routines is owned by the
-library, and will eventually be re-written. You should copy it if
-you want to preserve it.
-
-5.3 Time
-
-5.3.1 Time structure
-
-LIbical defines it's own time structure for storing all dates and times.
-It would have been nice to re-use the C library's struct tm, but that
-structure does not differentiate between dates and times, and between
-local time and UTC. The libical structure is:
-
-struct icaltimetype {
-
- int year;
-
- int month;
-
- int day;
-
- int hour;
-
- int minute;
-
- int second;
-
- int is_utc; /* 1-> time is in UTC timezone */
-
- int is_date; /* 1 -> interpret this as date. */ };
-
-The year, month, day, hour, minute and second fields hold the broken-out
-time values. The is_utc field distinguishes between times in UTC and
-a local time zone. The is_date field indicates if the time should
-be interpreted only as a date. If it is a date, the hour, minute and
-second fields are assumed to be zero, regardless of their actual vaules.
-
-5.3.2 Creating time structures
-
-There are several ways to create a new icaltimetype structure:
-
-struct icaltimetype icaltime_from_string(const char* str);
-
-struct icaltimetype icaltime_from_timet(time_t v, int is_date);
-
-struct icaltimetype icaltime_from_int(int v, int is_date, int is_utc);
-
-Icaltime_from_string takes any RFC2445 compliant time string:
-
-struct icaltimetype tt = icaltime_from_string("19970101T103000");
-
-Icaltime_from_timet takes a timet value, representing seconds past
-the POSIX epoch, and a flag to indicate if the time is a date. Dates
-have an identical structure to a time, but the time portion ( hours,
-minuts and seconds ) is always 00:00:00. Dates act differently in
-sorting an comparision, and they have a different string representation
-in RFC2445.
-
-The icaltime_from_int is like icaltime_from_timet, but with an arbitrary
-epoch. This routine was a mistake and is deprecated.
-
-5.3.3 Time manipulating routines
-
-The null time value is used to indicate that the data in the structure
-is not a valid time.
-
-struct icaltimetype icaltime_null_time(void);
-
-int icaltime_is_null_time(struct icaltimetype t);
-
-It is sensible for the broken-out time fields to contain values that
-are not permitted in an ISO compliant time string. For instance, the
-seconds field can hold values greater than 59, and the hours field
-can hold values larger than 24. The excessive values will be rolled
-over into the next larger field when the structure is normalized.
-
-struct icaltimetype icaltime_normalize(struct icaltimetype t);
-
-Normalizing allows you to do arithmetic operations on time values.
-
-struct icaltimetype tt = icaltime_from_string("19970101T103000");
-
-tt.days +=3
-
-tt.second += 70;
-
-tt = icaltime_normalize(tt);
-
-There are several routines to get the day of the week or month, etc,
-from a time structure.
-
-short icaltime_day_of_year(struct icaltimetype t);
-
-struct icaltimetype icaltime_from_day_of_year(short doy, short year);
-
-short icaltime_day_of_week(struct icaltimetype t);
-
-short icaltime_start_doy_of_week(struct icaltimetype t);
-
-short icaltime_week_number(short day_of_month, short month, short year);
-
-struct icaltimetype icaltime_from_week_number(short week_number, short
-year);
-
-short icaltime_days_in_month(short month,short year);
-
-Two routines convert time structures to and from the number of seconds
-since the POSIX epoch. The is_date field indicates whether or not
-the hour, minute and second fields should be used in the conversion.
-
-struct icaltimetype icaltime_from_timet(time_t v, int is_date);
-
-time_t icaltime_as_timet(struct icaltimetype);
-
-The compare routine works exactly like strcmp, but on time structures.
-
-int icaltime_compare(struct icaltimetype a,struct icaltimetype b);
-
-The following routines convert between UTC and a named timezone. The
-tzid field must be a timezone name from the Olsen database, such as
-"America/Los_Angeles."
-
-The utc_offset routine returns the offset of the named time zone from
-UTC, in seconds.
-
-The tt parameter in the following routines indicates the date on which
-the conversion should be made. The tt parameter is necessary because
-timezones have many different rules for when daylight savings time
-is used, and these rules can change over time. So, for a single timezone
-one year may have daylight savings time on March 15, but for other
-years March 15 may be standard time, and some years may have standard
-time all year.
-
-int icaltime_utc_offset(struct icaltimetype tt, char* tzid);
-
-int icaltime_local_utc_offset();
-
-struct icaltimetype icaltime_as_utc(struct icaltimetype tt,char* tzid);
-
-struct icaltimetype icaltime_as_zone(struct icaltimetype tt,char* tzid);
-
-struct icaltimetype icaltime_as_local(struct icaltimetype tt);
-
-5.4 Storing Objects
-
-The libical distribution includes a separate library, libicalss, that
-allows you to store iCal component data to disk in a variety of ways.
-This library also includes code to implement the CSTP protocol of
-CAP and has some routines for deciphering incomming messages.
-
-The file storage routines are organized in an inheritance heirarchy
-that is rooted in icalset, with the derived class icalfileset and
-icaldirset. Icalfileset stores components to a file, while icaldirset
-stores components to multiple files, one per month based on DTSTAMP.
-Other storages classess, for storage to a heap or a mysql database
-are planned for the future.
-
-All of the icalset derived classes have the same interface:
-
-icaldirset* icaldirset_new(const char* path);
-
-void icaldirset_free(icaldirset* store);
-
-const char* icaldirset_path(icaldirset* store);
-
-void icaldirset_mark(icaldirset* store);
-
-icalerrorenum icaldirset_commit(icaldirset* store);
-
-icalerrorenum icaldirset_add_component(icaldirset* store, icalcomponent*
-comp);
-
-icalerrorenum icaldirset_remove_component(icaldirset* store, icalcomponent*
-comp);
-
-int icaldirset_count_components(icaldirset* store, icalcomponent_kind
-kind);
-
-icalerrorenum icaldirset_select(icaldirset* store, icalcomponent* gauge);
-
-void icaldirset_clear(icaldirset* store);
-
-icalcomponent* icaldirset_fetch(icaldirset* store, const char* uid);
-
-int icaldirset_has_uid(icaldirset* store, const char* uid);
-
-icalcomponent* icaldirset_fetch_match(icaldirset* set, icalcomponent
-*c);
-
-icalerrorenum icaldirset_modify(icaldirset* store, icalcomponent *oldc,
-icalcomponent *newc);
-
-icalcomponent* icaldirset_get_current_component(icaldirset* store);
-
-icalcomponent* icaldirset_get_first_component(icaldirset* store);
-
-icalcomponent* icaldirset_get_next_component(icaldirset* store);
-
-5.4.1 Creating a new set
-
-You can create a new set from either the base class or the direved
-class. From the base class use one of:
-
-icalset* icalset_new_file(const char* path);
-
-icalset* icalset_new_dir(const char* path);
-
-icalset* icalset_new_heap(void);
-
-icalset* icalset_new_mysql(const char* path);
-
-You can also create a new set based on the derived class, For instance,
-with icalfileset:
-
-icalfileset* icalfileset_new(const char* path);
-
-icalfileset* icalfileset_new_open(const char* path, int flags, mode_t
-mode);
-
-Icaset_new_file is identical to icalfileset_new. BOth routines will
-open an existing file for readinga and writing, or create a new file
-if it does not exist. Icalfilset_new_open takes the same arguments
-as the open() system routine and behaves in the same way.
-
-The icalset and icalfilset objects are somewhat interchangable -- you
-can use an icalfileset* as an argument to any of the icalset routines.
-
-The following examples will all use icalfileset routines; using the
-other icalset derived classess will be similar.
-
-5.4.2 Adding, Finding and Removing Components
-
-To add components to a set, use:
-
-icalerrorenum icalfileset_add_component(icalfileset* cluster, icalcomponent*
-child);
-
-The fileset keeps an inmemory copy of the components, and this set
-must be written back to the file ocassionally. There are two routines
-to manage this:
-
-void icalfileset_mark(icalfileset* cluster);
-
-icalerrorenum icalfileset_commit(icalfileset* cluster);
-
-Icalfileset_mark indicates that the in-memory components have changed.
-Calling the _add_component routine will call _mark automatically,
-but you may need to call it yourself if you have made a change to
-an existing component. The _commit routine writes the data base to
-disk, but only if it is marked. The _commit routine is called automatically
-when the icalfileset is freed.
-
-To iterate through the components in a set, use:
-
-icalcomponent* icalfileset_get_first_component(icalfileset* cluster);
-
-icalcomponent* icalfileset_get_next_component(icalfileset* cluster);
-
-icalcomponent* icalfileset_get_current_component (icalfileset* cluster);
-
-These routines work like the corresponding routines from icalcomponent,
-except that their output is filtered through a gauge. A gauge is a
-test for the properties within a components; only components that
-pass the test are returned. A gauge can be constructed from a MINSQL
-string with:
-
-icalgauge* icalgauge_new_from_sql(char* sql);
-
-Then, you can add the gauge to the set with :
-
-icalerrorenum icalfileset_select(icalfileset* store, icalgauge* gauge);
-
-Here is an example that puts all of these routines together:
-
-void test_fileset()
-
-{
-
- icalfileset *fs;
-
- icalcomponent *c;
-
- int i;
-
- char *path = "test_fileset.ics";
-
- icalgauge *g = icalgauge_new_from_sql(
-
- "SELECT * FROM VEVENT WHERE DTSTART > '20000103T120000Z' AND
-DTSTART <= '20000106T120000Z'");
-
-
-
- fs = icalfileset_new(path);
-
-
-
- for (i = 0; i!= 10; i++){
-
- c = make_component(i); /* Make a new component where DTSTART
-has month of i */
-
- icalfileset_add_component(fs,c);
-
- }
-
- icalfileset_commit(fs); /* Write to disk */
-
- icalfileset_select(fs,g); /* Set the gauge to filter components
-*/
-
-
-
- for (c = icalfileset_get_first_component(fs);
-
- c != 0;
-
- c = icalfileset_get_next_component(fs)){
-
- struct icaltimetype t = icalcomponent_get_dtstart(c);
-
-
-
- printf("%s\n",icaltime_as_ctime(t));
-
- }
-
- icalfileset_free(fs);
-
-}
-
-5.4.3 Other routines
-
-There are several other routines in the icalset interface, but they
-not fully implemented yet.
-
-5.5 <sec:memory>Memory Management
-
-Libical relies heavily on dynamic allocation for both the core objects
-and for the strings used to hold values. Some of this memory the library
-caller owns and must free, and some of the memory is managed by the
-library. Here is a summary of the memory rules.
-
-1) If the function name has "new" in it, the caller gets control
- of the memory. ( such as icalcomponent_new(), or icalproperty_new_clone()
- )
-
-2) If you got the memory from a routine with new in it, you must
- call the corresponding *_free routine to free the memory. ( Use
- icalcomponent_free() to free objects created with icalcomponent_new())
-
-3) If the function name has "add" in it, the caller is transferring
- control of the memory to the routine. ( icalproperty_add_parameter() )
-
-4) If the function name has "remove" in it, the caller passes in
- a pointer to an object and after the call returns, the caller owns
- the object. So, before you call icalcomponent_remove_property(comp,foo),
- you do not own "foo" and after the call returns, you do.
-
-5) If the routine returns a string, libical owns the memory and will
- put it on a ring buffer to reclaim later. For example, icalcomponent_as_ical_string().
- You'd better strdup() it if you want to keep it, and you don't have
- to delete it.
-
-5.6 Error Handling
-
-Libical has several error handling mechanisms for the various types
-of programming, semantic and syntactic errors you may encounter.
-
-5.6.1 Return values
-
-Many library routines signal errors through their return values. All
-routines that return a pointer, such as icalcomponent_new(), will
-return 0 ( zero ) on a fatal error. Some routines will return a value
-of enum icalerrorenum.
-
-5.6.2 icalerrno
-
-Most routines will set the global error value icalerrno on errors.
-This variable is an enumeration; permissible values can be found in
-libical/icalerror.h. If the routine returns an enum icalerrorenum,
-then the return value will be the same as icalerrno. You can use icalerror_strerror()
-to get a string that describes the error. The enumerations are:
-
-* ICAL_BADARG_ERROR -- One of the argument to a routine was bad. Typically
- for a null pointer.
-
-* ICAL_NEWFAILED_ERROR -- A new() or malloc() failed
-
-* ICAL_MALFORMEDDATA_ERROR -- An input string was not in the correct
- format
-
-* ICAL_PARSE_ERROR -- The parser failed to parse an incomming component
-
-* ICAL_INTERNAL_ERROR -- Largely equivalent to an assert
-
-* ICAL_FILE_ERROR -- A file operation failed. Check errno for more
- detail.
-
-* ICAL_ALLOCATION_ERROR -- ?
-
-* ICAL_USAGE_ERROR -- ?
-
-* ICAL_NO_ERROR -- No error
-
-* ICAL_MULTIPLEINCLUSION_ERROR -- ?
-
-* ICAL_TIMEDOUT_ERROR -- For CSTP and acquiring locks
-
-* ICAL_UNKNOWN_ERROR -- ?
-
-5.6.3 X-LIC-ERROR and X-LIC-INVALID-COMPONENT
-
-The library handles semantic and syntactic errors in components by
-inserting errors properties into the components. If the parser cannot
-parse incoming text ( a syntactic error ) or if the icalrestriction_check()
-routine indicates that the component does not meet the requirements
-of RFC2446 ( a semantic error) the library will insert properties
-of the type X-LIC-ERROR to describe the error. Here is an example
-of the error property:
-
-X-LIC-ERROR;X-LIC-ERRORTYPE=INVALID_ITIP :Failed iTIP restrictions
-for property DTSTART.
-
-Expected 1 instances of the property and got 0
-
-This error resulted from a call to icalrestriction_check(), which discovered
-that the component does not have a DTSTART property, as required by
-RFC2445.
-
-There are a few routines to manipulate error properties:
-
-[ The following data is supposed to be in a table. It looks OK in LyX,
-but does not format propertly in output. ]
-
-+-------------------------------------+---------------------------------------------------------+
-| Routine | Purpose |
-+-------------------------------------+---------------------------------------------------------+
-| void icalrestriction_check() | Check a component against RFC2446 and insert |
-+-------------------------------------+---------------------------------------------------------+
-| | error properties to indicate non compliance |
-+-------------------------------------+---------------------------------------------------------+
-| int icalcomponent_count_errors() | Return the number of error properties |
-+-------------------------------------+---------------------------------------------------------+
-| | in a component |
-+-------------------------------------+---------------------------------------------------------+
-| void icalcomponent_strip_errors() | Remove all error properties in as |
-+-------------------------------------+---------------------------------------------------------+
-| | component |
-+-------------------------------------+---------------------------------------------------------+
-| void icalcomponent_convert_errors() | Convert some error properties into |
-+-------------------------------------+---------------------------------------------------------+
-| | REQUESTS-STATUS proprties to indicate the inability to |
-+-------------------------------------+---------------------------------------------------------+
-| | process the component as an iTIP request. |
-+-------------------------------------+---------------------------------------------------------+
-
-
-The types of errors are listed in icalerror.h. They are:
-
-ICAL_XLICERRORTYPE_COMPONENTPARSEERROR
-
-ICAL_XLICERRORTYPE_PARAMETERVALUEPARSEERROR
-
-ICAL_XLICERRORTYPE_PARAMETERNAMEPARSEERROR
-
-ICAL_XLICERRORTYPE_PROPERTYPARSEERROR
-
-ICAL_XLICERRORTYPE_VALUEPARSEERROR
-
-ICAL_XLICERRORTYPE_UNKVCALPROP
-
-ICAL_XLICERRORTYPE_INVALIDITIP
-
-The libical parser will generate the error that end in PARSEERROR when
-it encounters garbage in the input steam. ICAL_XLICERRORTYPE_INVALIDITIP
-is inserted by icalrestriction_check(), and ICAL_XLICERRORTYPE_UNKVCALPROP
-is generated by icalvcal_convert() when it encounters a vCal property
-that it cannot convert or does not know about.
-
-Icalcomponent_convert_errors() converts some of the error properties
-in a component into REQUEST-STATUS properties that indicate a failure.
-As of libical version0.18, this routine only convert *PARSEERROR errors
-and it always generates a 3.x ( failure ) code. This makes it more
-of a good idea than a really useful bit of code.
-
-5.6.4 ICAL_ERRORS_ARE_FATAL and icalerror_errors_are_fatal
-
-If the global variable icalerror_errors_are_fatal is set to 1, then
-any error condition will cause the program to abort. The abort occurs
-in icalerror_set_errno(), and is done with an assert(0) if NDEBUG
-is undefined, and with icalerror_crash_here if NDEBUG is defined.
-The default value of icalerror_errors_are_fatal is 1 when ICAL_ERRORS_ARE_FATAL
-is defined, and 0 otherwise. Since ICAL_ERRORS_ARE_FATAL is defined
-by default, icalerror_errors_are_fatal is also defined by default.
-
-5.7 Naming Standard
-
-Structures that you access with the "struct" keyword, such as "struct
-icaltimetype" are things that you are allowed to see inside and poke
-at.
-
-Structures that you access though a typedef, such as "icalcomponent"
-are things where all of the data is hidden.
-
-Component names that start with "V" are part of RFC 2445 or another
-iCal standard. Component names that start with "X" are also part of
-the spec, but they are not actually components in the spec. However,
-they look and act like components, so they are components in libical.
-Names that start with "XLIC" or "X-LIC" are not part of any iCal spec.
-They are used internally by libical.
-
-Enums that identify a component, property, value or parameter end with
-"_COMPONENT," "_PROPERTY," "_VALUE," or "_PARAMETER"s
-
-Enums that identify a parameter value have the name of the parameter
-as the second word. For instance: ICAL_ROLE_REQPARTICIPANT or ICAL_PARTSTAT_ACCEPTED.
-
-The enums for the parts of a recurarance rule and request statuses
-are irregular.
-
-6 Hacks and Bugs
-
-There are a lot of hacks in the library -- bits of code that I am not
-proud of and should probably be changed. These are marked with the
-comment string "HACK."
-
-7 Library Reference
-
-7.1 Manipulating struct icaltimetype
-
-7.1.1 Struct icaltimetype
-
-struct icaltimetype
-
-{
-
- int year;
-
- int month;
-
- int day;
-
- int hour;
-
- int minute;
-
- int second;
-
- int is_utc;
-
- int is_date;
-
- const char* zone;
-
-};
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