342 lines
11 KiB
Groff
342 lines
11 KiB
Groff
.\" $NetBSD: prop_dictionary.3,v 1.17 2011/02/21 13:42:57 njoly Exp $
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.\"
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.\" Copyright (c) 2006, 2009 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd December 5, 2009
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.Dt PROP_DICTIONARY 3
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.Os
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.Sh NAME
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.Nm prop_dictionary ,
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.Nm prop_dictionary_create ,
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.Nm prop_dictionary_create_with_capacity ,
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.Nm prop_dictionary_copy ,
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.Nm prop_dictionary_copy_mutable ,
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.Nm prop_dictionary_count ,
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.Nm prop_dictionary_ensure_capacity ,
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.Nm prop_dictionary_iterator ,
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.Nm prop_dictionary_all_keys ,
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.Nm prop_dictionary_make_immutable ,
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.Nm prop_dictionary_mutable ,
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.Nm prop_dictionary_get ,
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.Nm prop_dictionary_set ,
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.Nm prop_dictionary_remove ,
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.Nm prop_dictionary_get_keysym ,
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.Nm prop_dictionary_set_keysym ,
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.Nm prop_dictionary_remove_keysym ,
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.Nm prop_dictionary_externalize ,
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.Nm prop_dictionary_internalize ,
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.Nm prop_dictionary_externalize_to_file ,
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.Nm prop_dictionary_internalize_from_file ,
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.Nm prop_dictionary_externalize_to_pref ,
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.Nm prop_dictionary_equals ,
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.Nm prop_dictionary_keysym_cstring_nocopy ,
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.Nm prop_dictionary_keysym_equals
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.Nd dictionary property collection object
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.Sh LIBRARY
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.Lb libprop
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.Sh SYNOPSIS
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.In prop/proplib.h
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.\"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_create "void"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_create_with_capacity "unsigned int capacity"
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.\"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_copy "prop_dictionary_t dict"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_copy_mutable "prop_dictionary_t dict"
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.\"
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.Ft unsigned int
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.Fn prop_dictionary_count "prop_dictionary_t dict"
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.Ft bool
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.Fn prop_dictionary_ensure_capacity "prop_dictionary_t dict" \
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"unsigned int capacity"
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.\"
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.Ft prop_object_iterator_t
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.Fn prop_dictionary_iterator "prop_dictionary_t dict"
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.Ft prop_array_t
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.Fn prop_dictionary_all_keys "prop_dictionary_t dict"
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.\"
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.Ft void
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.Fn prop_dictionary_make_immutable "prop_dictionary_t dict"
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.Ft bool
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.Fn prop_dictionary_mutable "prop_dictionary_t dict"
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.\"
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.Ft prop_object_t
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.Fn prop_dictionary_get "prop_dictionary_t dict" "const char *key"
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.Ft bool
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.Fn prop_dictionary_set "prop_dictionary_t dict" "const char *key" \
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"prop_object_t obj"
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.Ft void
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.Fn prop_dictionary_remove "prop_dictionary_t dict" "const char *key"
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.\"
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.Ft prop_object_t
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.Fn prop_dictionary_get_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t keysym"
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.Ft bool
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.Fn prop_dictionary_set_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t keysym" "prop_object_t obj"
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.Ft void
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.Fn prop_dictionary_remove_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t keysym"
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.\"
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.Ft bool
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.Fn prop_dictionary_equals "prop_dictionary_t dict1" "prop_dictionary_t dict2"
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.\"
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.Ft const char *
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.Fn prop_dictionary_keysym_cstring_nocopy "prop_dictionary_keysym_t sym"
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.\"
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.Ft bool
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.Fn prop_dictionary_keysym_equals "prop_dictionary_keysym_t keysym1" \
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"prop_dictionary_keysym_t keysym2"
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.\"
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.Ft char *
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.Fn prop_dictionary_externalize "prop_dictionary_t dict"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_internalize "const char *xml"
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.\"
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.Ft bool
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.Fn prop_dictionary_externalize_to_file "prop_dictionary_t dict" \
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"const char *path"
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.Ft prop_dictionary_t
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.Fn prop_dictionary_internalize_from_file "const char *path"
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.\"
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.Ft bool
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.Fn prop_dictionary_externalize_to_pref "prop_dictionary_t dict" \
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"struct plistref *pref"
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.\"
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.Sh DESCRIPTION
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The
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.Nm prop_dictionary
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family of functions operate on the dictionary property collection object type.
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A dictionary is an unordered set of objects stored as key-value pairs.
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.Bl -tag -width "xxxxx"
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.It Fn prop_dictionary_create "void"
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Create an empty dictionary.
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The dictionary initially has no capacity.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_dictionary_create_with_capacity "unsigned int capacity"
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Create a dictionary with the capacity to store
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.Fa capacity
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objects.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_dictionary_copy "prop_dictionary_t dict"
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Copy a dictionary.
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The new dictionary has an initial capacity equal to the number of objects
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stored in the dictionary being copied.
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The new dictionary contains references to the original dictionary's objects,
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not copies of those objects
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.Pq i.e. a shallow copy is made .
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If the original dictionary is immutable, the resulting dictionary is also
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immutable.
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.It Fn prop_dictionary_copy_mutable "prop_dictionary_t dict"
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Like
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.Fn prop_dictionary_copy ,
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except the resulting dictionary is always mutable.
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.It Fn prop_dictionary_count "prop_dictionary_t dict"
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Returns the number of objects stored in the dictionary.
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.It Fn prop_dictionary_ensure_capacity "prop_dictionary_t dict" \
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"unsigned int capacity"
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Ensure that the dictionary has a total capacity of
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.Fa capacity ,
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including objects already stored in the dictionary.
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Returns
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.Dv true
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if the capacity of the dictionary is greater or equal to
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.Fa capacity
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or if the expansion of the dictionary's capacity was successful
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and
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.Dv false
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otherwise.
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If the supplied object isn't a dictionary,
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.Dv false
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is returned.
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.It Fn prop_dictionary_iterator "prop_dictionary_t dict"
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Create an iterator for the dictionary.
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The dictionary is retained by the iterator.
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A dictionary iterator returns the key symbols used to look up objects stored
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in the dictionary; to get the object itself, a dictionary lookup using this
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key symbol must be performed.
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Storing to or removing from the dictionary invalidates any active iterators for
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the dictionary.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_dictionary_all_keys "prop_dictionary_t dict"
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Return an array of all of the dictionary key symbols
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.Pq prop_dictionary_keysym_t
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in the dictionary.
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This provides a way to iterate over the items in the dictionary while
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retaining the ability to mutate the dictionary; instead of iterating
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over the dictionary itself, iterate over the array of keys.
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The caller is responsible for releasing the array.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_dictionary_make_immutable "prop_dictionary_t dict"
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Make
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.Fa dict
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immutable.
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.It Fn prop_dictionary_mutable "prop_dictionary_t dict"
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Returns
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.Dv true
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if the dictionary is mutable.
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.It Fn prop_dictionary_get "prop_dictionary_t dict" "const char *key"
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Return the object stored in the dictionary with the key
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.Fa key .
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If no object is stored with the specified key,
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.Dv NULL
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is returned.
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.It Fn prop_dictionary_set "prop_dictionary_t dict" "const char *key" \
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"prop_object_t obj"
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Store a reference to the object
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.Fa obj
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with the key
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.Fa key .
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The object will be retained by the dictionary.
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If the key already exists in the dictionary, the object associated with
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that key will be released and replaced with the new object.
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Returns
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.Dv true
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if storing the object was successful and
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.Dv false
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otherwise.
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.It Fn prop_dictionary_remove "prop_dictionary_t dict" "const char *key"
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Remove the reference to the object stored in the dictionary with the key
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.Fa key .
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The object will be released.
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.It Fn prop_dictionary_get_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t sym"
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Like
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.Fn prop_dictionary_get ,
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but the lookup is performed using a key symbol returned by a dictionary
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iterator.
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The results are undefined if the iterator used to obtain the key symbol
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is not associated with
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.Fa dict .
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.It Fn prop_dictionary_set_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t sym" "prop_object_t obj"
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Like
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.Fn prop_dictionary_set ,
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but the lookup of the object to replace is performed using a key symbol
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returned by a dictionary iterator.
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The results are undefined if the iterator used to obtain the key symbol
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is not associated with
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.Fa dict .
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.It Fn prop_dictionary_remove_keysym "prop_dictionary_t dict" \
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"prop_dictionary_keysym_t sym"
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Like
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.Fn prop_dictionary_remove ,
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but the lookup of the object to remove is performed using a key symbol
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returned by a dictionary iterator.
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The results are undefined if the iterator used to obtain the key symbol
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is not associated with
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.Fa dict .
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.It Fn prop_dictionary_equals "prop_dictionary_t dict1" \
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"prop_dictionary_t dict2"
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Returns
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.Dv true
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if the two dictionaries are equivalent.
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Note: Objects contained in the dictionary are compared by value, not by
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reference.
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.It Fn prop_dictionary_keysym_cstring_nocopy "prop_dictionary_keysym_t keysym"
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Returns an immutable reference to the dictionary key symbol's string value.
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.It Fn prop_dictionary_keysym_equals "prop_dictionary_keysym_t keysym1" \
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"prop_dictionary_keysym_t keysym2"
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Returns
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.Dv true
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if the two dictionary key symbols are equivalent.
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.It Fn prop_dictionary_externalize "prop_dictionary_t dict"
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Externalizes a dictionary, returning a NUL-terminated buffer containing
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the XML representation of the dictionary.
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The caller is responsible for freeing the returned buffer.
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If converting to the external representation fails for any reason,
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.Dv NULL
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is returned.
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.Pp
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In user space, the buffer is allocated using
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.Xr malloc 3 .
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In the kernel, the buffer is allocated using
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.Xr malloc 9
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using the malloc type
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.Dv M_TEMP .
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.It Fn prop_dictionary_internalize "const char *xml"
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Parse the XML representation of a property list in the NUL-terminated
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buffer
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.Fa xml
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and return the corresponding dictionary.
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Returns
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.Dv NULL
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if parsing fails for any reason.
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.It Fn prop_dictionary_externalize_to_file "prop_dictionary_t dict" \
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"const char *path"
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Externalizes a dictionary and writes it to the file specified by
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.Fa path .
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The file is saved with the mode
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.Dv 0666
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as modified by the process's file creation mask
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.Pq see Xr umask 2
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and is written atomically.
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Returns
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.Dv false
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if externalizing or writing the dictionary fails for any reason.
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.It Fn prop_dictionary_internalize_from_file "const char *path"
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Reads the XML property list contained in the file specified by
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.Fa path ,
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internalizes it, and returns the corresponding dictionary.
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Returns
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.Dv NULL
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on failure.
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.It Fn prop_dictionary_externalize_to_pref "prop_dictionary_t dict" \
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"struct plistref *pref"
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Externalizes a dictionary and packs it into the plistref specified by
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.Fa pref .
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Returns
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.Dv false
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if externalizing the dictionary fails for any reason.
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.El
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.Sh SEE ALSO
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.Xr prop_array 3 ,
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.Xr prop_bool 3 ,
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.Xr prop_data 3 ,
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.Xr prop_dictionary_util 3 ,
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.Xr prop_number 3 ,
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.Xr prop_object 3 ,
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.Xr prop_string 3 ,
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.Xr proplib 3
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.Sh HISTORY
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The
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.Nm proplib
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property container object library first appeared in
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.Nx 4.0 .
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