PROP_ARRAY(3) | Library Functions Manual | PROP_ARRAY(3)

# NAME

`prop_array`, `prop_array_create`, `prop_array_create_with_capacity`, `prop_array_copy`, `prop_array_copy_mutable`, `prop_array_capacity`, `prop_array_count`, `prop_array_ensure_capacity`, `prop_array_iterator`, `prop_array_make_immutable`, `prop_array_mutable`, `prop_array_get`, `prop_array_set`, `prop_array_add`, `prop_array_remove`, `prop_array_externalize`, `prop_array_internalize`, `prop_array_externalize_to_file`, `prop_array_internalize_from_file`, `prop_array_externalize_to_pref`, `prop_array_internalize_from_pref`, `prop_array_equals` —
array property collection object

# LIBRARY

Property Container Object Library (libprop, -lprop)

# SYNOPSIS

`#include <prop/proplib.h>`

prop_array_t
`prop_array_create`(void);

prop_array_t
`prop_array_create_with_capacity`(unsigned int capacity);

prop_array_t
`prop_array_copy`(prop_array_t array);

prop_array_t
`prop_array_copy_mutable`(prop_array_t array);

unsigned int
`prop_array_capacity`(prop_array_t array);

unsigned int
`prop_array_count`(prop_array_t array);

bool
`prop_array_ensure_capacity`(prop_array_t array, unsigned int capacity);

prop_object_iterator_t
`prop_array_iterator`(prop_array_t array);

void
`prop_array_make_immutable`(prop_array_t array);

bool
`prop_array_mutable`(prop_array_t array);

prop_object_t
`prop_array_get`(prop_array_t array, unsigned int index);

bool
`prop_array_set`(prop_array_t array, unsigned int index, prop_object_t obj);

bool
`prop_array_add`(prop_array_t array, prop_object_t obj);

void
`prop_array_remove`(prop_array_t array, unsigned int index);

char *
`prop_array_externalize`(prop_array_t array);

prop_array_t
`prop_array_internalize`(const char *xml);

bool
`prop_array_externalize_to_file`(prop_array_t array, const char *path);

prop_array_t
`prop_array_internalize_from_file`(const char *path);

bool
`prop_array_externalize_to_pref`(prop_array_t array, struct plistref *pref);

bool
`prop_array_internalize_from_pref`(const struct plistref *pref, prop_array_t *arrayp);

bool
`prop_array_equals`(prop_array_t array1, prop_array_t array2);

# DESCRIPTION

The `prop_array`() family of functions operate on the array property collection object type. An array is an ordered set; an iterated array will return objects in the same order with which they were stored.

`prop_array_create`(void)
  Create an empty array. The array initially has no capacity. Returns `NULL` on failure.
`prop_array_create_with_capacity`(unsigned int capacity)
  Create an array with the capacity to store capacity objects. Returns `NULL` on failure.
`prop_array_copy`(prop_array_t array)
  Copy an array. The new array has an initial capacity equal to the number of objects stored in the array being copied. The new array contains references to the original array's objects, not copies of those objects (i.e. a shallow copy is made). If the original array is immutable, the resulting array is also immutable. Returns `NULL` on failure.
`prop_array_copy_mutable`(prop_array_t array)
  Like `prop_array_copy`(), except the resulting array is always mutable.
`prop_array_capacity`(prop_array_t array)
  Returns the total capacity of the array, including objects already stored in the array. If the supplied object isn't an array, zero is returned.
`prop_array_count`(prop_array_t array)
  Returns the number of objects stored in the array. If the supplied object isn't an array, zero is returned.
`prop_array_ensure_capacity`(prop_array_t array, unsigned int capacity)
  Ensure that the array has a total capacity of capacity, including objects already stored in the array. Returns `true` if the capacity of the array is greater or equal to capacity or if expansion of the array's capacity was successful and `false` otherwise.
`prop_array_iterator`(prop_array_t array)
  Create an iterator for the array. The array is retained by the iterator. An array iterator returns the object references stored in the array. Storing to or removing from the array invalidates any active iterators for the array. Returns `NULL` on failure.
`prop_array_make_immutable`(prop_array_t array)
  Make array immutable.
`prop_array_mutable`(prop_array_t array)
  Returns `true` if the array is mutable.
`prop_array_get`(prop_array_t array, unsigned int index)
  Return the object stored at the array index index. Returns `NULL` on failure.
`prop_array_set`(prop_array_t array, unsigned int index, prop_object_t obj)
  Store a reference to the object obj at the array index index. This function is not allowed to create holes in the array; the caller must either be setting the object just beyond the existing count or replacing an already existing object reference. The object will be retained by the array. If an existing object reference is being replaced, that object will be released. Returns `true` if storing the object was successful and `false` otherwise.
`prop_array_add`(prop_array_t array, prop_object_t obj)
  Add a reference to the object obj to the array, appending to the end and growing the array's capacity if necessary. The object will be retained by the array. Returns `true` if storing the object was successful and `false` otherwise.

  During expansion, array's capacity is augmented by the `EXPAND_STEP` constant, as defined in libprop/prop_array.c file, e.g.

  `#define EXPAND_STEP 16`
`prop_array_remove`(prop_array_t array, unsigned int index)
  Remove the reference to the object stored at array index index. The object will be released and the array compacted following the removal.
`prop_array_externalize`(prop_array_t array)
  Externalizes an array, returning a NUL-terminated buffer containing the XML representation of the array. The caller is responsible for freeing the returned buffer. If converting to the external representation fails for any reason, `NULL` is returned.

  In user space, the buffer is allocated using malloc(3). In the kernel, the buffer is allocated using malloc(9) using the malloc type `M_TEMP`.

`prop_array_internalize`(const char *xml)
  Parse the XML representation of a property list in the NUL-terminated buffer xml and return the corresponding array. Returns `NULL` if parsing fails for any reason.
`prop_array_externalize_to_file`(prop_array_t array, const char *path)
  Externalizes an array and writes it to the file specified by path. The file is saved with the mode `0666` as modified by the process's file creation mask (see umask(2)) and is written atomically. Returns `false` if externalizing or writing the array fails for any reason.
`prop_array_internalize_from_file`(const char *path)
  Reads the XML property list contained in the file specified by path, internalizes it, and returns the corresponding array. Returns `NULL` on failure.
`prop_array_externalize_to_pref`(prop_array_t array, struct plistref *pref)
  Externalizes an array and packs it into the plistref specified by pref. Returns `false` if externalizing the array fails for any reason.
`prop_array_internalize_from_pref`(const struct plistref *pref, prop_array_t *arrayp)
  Reads the plistref specified by pref, internalizes it, and returns the corresponding array. Returns `false` if internalizing or writing the array fails for any reason.
`prop_array_equals`(prop_array_t array1, prop_array_t array2)
  Returns `true` if the two arrays are equivalent. If at least one of the supplied objects isn't an array, `false` is returned. Note: Objects contained in the array are compared by value, not by reference.

# SEE ALSO

prop_bool(3), prop_data(3), prop_dictionary(3), prop_number(3), prop_object(3), prop_string(3), proplib(3)

# HISTORY

The proplib(3) property container object library first appeared in NetBSD 4.0.

October 10, 2009 | NetBSD 9.2