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Dd June 2, 2020
Dt PROP_DATA 3
Os
Sh NAME
Nm prop_data ,
Nm prop_data_create_copy ,
Nm prop_data_create_nocopy ,
Nm prop_data_copy ,
Nm prop_data_size ,
Nm prop_data_value ,
Nm prop_data_copy_value ,
Nm prop_data_equals ,
Nm prop_data_equals_data
Nd opaque data value property object
Sh LIBRARY
Lb libprop
Sh SYNOPSIS
In prop/proplib.h
\"
Ft prop_data_t
Fn prop_data_create_copy "const void *blob" "size_t len"
Ft prop_data_t
Fn prop_data_create_nocopy "const void *blob" "size_t len"
\"
Ft prop_data_t
Fn prop_data_copy "prop_data_t data"
\"
Ft const void *
Fn prop_data_value "prop_data_t data"
Ft bool
Fn prop_data_copy_value "prop_data_t data" "void *buf" "size_t buflen"
\"
Ft size_t
Fn prop_data_size "prop_data_t data"
\"
Ft bool
Fn prop_data_equals "prop_data_t dat1" "prop_data_t dat2"
Ft bool
Fn prop_data_equals_data "prop_data_t data" "const void *blob" "size_t len"
Sh DESCRIPTION
The
Nm
family of functions operate on an opaque data value property object type.
Bl -tag -width "xxxxx"
It Fn prop_data_create_copy "const void *blob" "size_t len"
Create a data object that contains a copy of
Fa blob
with size
Fa len .
Returns
Dv NULL
on failure.
It Fn prop_data_create_nocopy "const void *blob" "size_t len"
Similar to
Fn prop_data_create_copy ,
but is allowed to not create aan internal copy of the opaque data, instead
referencing the buffer passed by the caller.
Caution must be exercised because data objects can have an indefinite
lifespan.
The caller must therefore ensure that the provided buffer reference will
also be valid indefinitely.
This is provided as a memory optimization; it is not guaranteed that
the returned data object will reference the provided buffer, and thus
callers should not rely on this behavior.
Returns
Dv NULL
on failure.
It Fn prop_data_copy "prop_data_t data"
Copy a data object.
If the data object being copied is an external data reference,
then the copy also references the same external data.
Returns
Dv NULL
on failure.
It Fn prop_data_size "prop_data_t data"
Returns the size of the data object.
If the supplied object isn't a data object, zero is returned.
It Fn prop_data_value "prop_data_t data"
Returns a reference to the data object's buffer.
If the supplied object isn't a data object or
if the data container is empty,
Dv NULL
is returned.
It Fn prop_data_copy_value "prop_data_t data" "void *buf" "size_t buflen"
Copies the contents of the data object into the supplied buffer of the
specified size.
Returns
Dv true
if the copy succeeds and
Dv false
iff the supplied buffer is not large enough or if the object is not a
data object.
It Fn prop_data_equals "prop_data_t dat1" "prop_data_t dat2"
Returns
Dv true
if the two data objects are equivalent.
If at least one of the supplied objects isn't a data object,
Dv false
is returned.
It Fn prop_data_equals_data "prop_data_t data" "const void *blob" "size_t len"
Returns
Dv true
if the data object's value is equivalent to
Fa blob
with size
Fa len .
If the supplied object isn't a data object,
Dv false
is returned.
El
Sh SEE ALSO
Xr prop_array 3 ,
Xr prop_bool 3 ,
Xr prop_dictionary 3 ,
Xr prop_number 3 ,
Xr prop_object 3 ,
Xr prop_string 3 ,
Xr proplib 3
Sh HISTORY
The
Xr proplib 3
property container object library first appeared in
Nx 4.0 .
Support for mutable data objects was deprecated in
Nx 10.0 .

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