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NetBSD 6.1.5 - man page for prop_ingest (netbsd section 3)

PROP_INGEST(3)			   BSD Library Functions Manual 		   PROP_INGEST(3)

NAME
     prop_ingest_context_alloc, prop_ingest_context_free, prop_ingest_context_error,
     prop_ingest_context_type, prop_ingest_context_key, prop_ingest_context_private,
     prop_dictionary_ingest -- Ingest a dictionary into an arbitrary binary format

SYNOPSIS
     #include <prop/proplib.h>

     prop_ingest_context_t
     prop_ingest_context_alloc(void *private);

     void
     prop_ingest_context_free(prop_ingest_context_t ctx);

     prop_ingest_error_t
     prop_ingest_context_error(prop_ingest_context_t ctx);

     prop_type_t
     prop_ingest_context_type(prop_ingest_context_t ctx);

     const char *
     prop_ingest_context_key(prop_ingest_context_t ctx);

     void *
     prop_ingest_context_private(prop_ingest_context_t ctx);

     bool
     prop_dictionary_ingest(prop_dictionary_t dict, const prop_ingest_table_entry rules[],
	 prop_ingest_context_t ctx);

     typedef bool
     (*prop_ingest_handler_t)(prop_ingest_context_t, prop_object_t);

DESCRIPTION
     The prop_dictionary_ingest function provides a convenient way to convert a property list
     into an arbitrary binary format or to extract values from dictionaries in a way that is con-
     venient to an application (for configuration files, for example).

     prop_dictionary_ingest is driven by a table of rules provided by the application.	Each rule
     consists of three items:

     o	 A C string containing a key to be looked up in the dictionary.

     o	 The expected property type of the object associated with the key (or PROP_TYPE_UNKNOWN
	 to specify that any type is allowed).

     o	 A callback function of type prop_ingest_handler_t that will perform the translation for
	 the application.

     The table is constructed using a series of macros as follows:

     static const prop_ingest_table_entry ingest_rules[] = {
	     PROP_INGEST("file-name", PROP_TYPE_STRING, ingest_filename),
	     PROP_INGEST("count", PROP_TYPE_NUMBER, ingest_count),
	     PROP_INGEST_OPTIONAL("required", PROP_TYPE_BOOL, ingest_required),
	     PROP_INGEST_OPTIONAL("extra", PROP_TYPE_UNKNOWN, ingest_extra),
	     PROP_INGEST_END
     };

     The PROP_INGEST macro specifies that the key is required to be present in the dictionary.
     The PROP_INGEST_OPTIONAL macro specifies that the presence of the key in the dictionary is
     optional.	The PROP_INGEST_END macro marks the end of the rules table.

     In each case, prop_dictionary_ingest looks up the rule's key in the dictionary.  If an
     object is present in the dictionary at that key, its type is checked against the type speci-
     fied in the rule.	A type specification of PROP_TYPE_UNKNOWN allows the object to be of any
     type.  If the object does not exist and the rule is not marked as optional, then an error is
     returned.	Otherwise, the handler specified in the rule is invoked with the ingest context
     and the object (or NULL if the key does not exist in the dictionary).  The handler should
     return false if the value of the object is invalid to indicate failure and true otherwise.

     The ingest context contains several pieces of information that are useful during the ingest
     process.  The context also provides specific error information should the ingest fail.

     prop_ingest_context_alloc(void *private)
	    Allocate an ingest context.  The argument private may be used to pass application-
	    specific context to the ingest handlers.  Note that an ingest context can be re-used
	    to perform multiple ingests.  Returns NULL on failure.

     prop_ingest_context_free(prop_ingest_context_t ctx)
	    Free an ingest context.

     prop_ingest_context_error(prop_ingest_context_t ctx)
	    Returns the code indicating the error encountered during ingest.  The following error
	    codes are defined:

	    PROP_INGEST_ERROR_NO_ERROR	      No error was encountered during ingest.
	    PROP_INGEST_ERROR_NO_KEY	      A non-optional key was not found in the dictionary.
	    PROP_INGEST_ERROR_WRONG_TYPE      An object in the dictionary was not the same type
					      specified in the rules.
	    PROP_INGEST_ERROR_HANDLER_FAILED  An object's handler returned false.

     prop_ingest_context_type(prop_ingest_context_t ctx)
	    Returns the type of the last object visited during an ingest.  When called by an
	    ingest handler, it returns the type of the object currently being processed.

     prop_ingest_context_key(prop_ingest_context_t ctx)
	    Returns the last dictionary key looked up during an ingest.  When called by an ingest
	    handler, it returns the dictionary key corresponding to the object currently being
	    processed.

     prop_ingest_context_private(prop_ingest_context_t ctx)
	    Returns the private data set when the context was allocated with
	    prop_ingest_context_alloc().

SEE ALSO
     prop_dictionary(3), proplib(3)

HISTORY
     The proplib property container object library first appeared in NetBSD 4.0.

BSD					 January 21, 2008				      BSD


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