\"      $NetBSD: prop_number.3,v 1.6 2007/02/02 19:35:59 mjf Exp $
\"
\" Copyright (c) 2006 The NetBSD Foundation, Inc.
\" All rights reserved.
\"
\" This code is derived from software contributed to The NetBSD Foundation
\" by Jason R. Thorpe.
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\" modification, are permitted provided that the following conditions
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\" This product includes software developed by the NetBSD
\" Foundation, Inc. and its contributors.
\" 4. Neither the name of The NetBSD Foundation nor the names of its
\" contributors may be used to endorse or promote products derived
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\"
Dd October 11, 2006
Dt PROP_NUMBER 3
Os
Sh NAME
Nm prop_number ,
Nm prop_number_create_integer ,
Nm prop_number_create_unsigned_integer ,
Nm prop_number_copy ,
Nm prop_number_size ,
Nm prop_number_unsigned ,
Nm prop_number_integer_value ,
Nm prop_number_unsigned_integer_value ,
Nm prop_number_equals ,
Nm prop_number_equals_integer ,
Nm prop_number_equals_unsigned_integer
Nd numeric value property object
Sh LIBRARY
Lb libprop
Sh SYNOPSIS
In prop/proplib.h
\"
Ft prop_number_t
Fn prop_number_create_integer "int64_t val"
Ft prop_number_t
Fn prop_number_create_unsigned_integer "uint64_t val"
Ft prop_number_t
Fn prop_number_copy "prop_number_t number"
\"
Ft int
Fn prop_number_size "prop_number_t number"
Ft boolean_t
Fn prop_number_unsigned "prop_number_t number"
Ft int64_t
Fn prop_number_integer_value "prop_number_t number"
Ft uint64_t
Fn prop_number_unsigned_integer_value "prop_number_t number"
\"
Ft boolean_t
Fn prop_number_equals "prop_number_t num1" "prop_number_t num2"
Ft boolean_t
Fn prop_number_equals_integer "prop_number_t number" "int64_t val"
Ft boolean_t
Fn prop_number_equals_unsigned_integer "prop_number_t number" "uint64_t val"
Sh DESCRIPTION
The
Nm prop_number
family of functions operate on a numeric value property object type.
Values are either signed or unsigned, and promoted to a 64-bit type
Pq int64_t or uint64_t , respectively .
Pp
It is possible to compare number objects that differ in sign.
Such comparisons first test to see if each object is within the valid
number range of the other:
Bl -bullet
It
Signed numbers that are greater than or equal to 0 can be compared to
unsigned numbers.
It
Unsigned numbers that are less than or equal to the largest signed 64-bit
value
Pq Dv INT64_MAX
can be compared to signed numbers.
El
Pp
Number objects have a different externalized representation depending
on their sign:
Bl -bullet
It
Signed numbers are externalized in base-10
Pq decimal .
It
Unsigned numbers are externalized in base-16
Pq hexadecimal .
El
Pp
When numbers are internalized, the sign of the resulting number object
Pq and thus its valid range
is determined by a set of rules evaluated in the following order:
Bl -bullet
It
If the first character of the number is a
Sq -
then the number is signed.
It
If the first two characters of the number are
Sq 0x
then the number is unsigned.
It
If the number value fits into the range of a signed number then the
number is signed.
It
In all other cases, the number is unsigned.
El
Bl -tag -width "xxxxx"
It Fn prop_number_create_integer "int64_t val"
Create a numeric value object with the signed value
Fa val .
It Fn prop_number_create_unsigned_integer "uint64_t val"
Create a numeric value object with the unsigned value
Fa val .
It Fn prop_number_copy "prop_number_t number"
Copy a numeric value object.
It Fn prop_number_size "prop_number_t number"
Returns 8, 16, 32, or 64, representing the number of bits required to
hold the value of the object.
It Fn prop_number_unsigned "prop_number_t number"
Returns
Dv TRUE
if the numeric value object has an unsigned value.
It Fn prop_number_integer_value "prop_number_t number"
Returns the signed integer value of the numeric value object.
It Fn prop_number_unsigned_integer_value "prop_number_t number"
Returns the unsigned integer value of the numeric value object.
It Fn prop_number_equals "prop_number_t num1" "prop_number_t num2"
Returns
Dv TRUE
if the two numeric value objects are equivalent.
It Fn prop_number_equals_integer "prop_number_t number" "int64_t val"
Returns
Dv TRUE
if the object's value is equivalent to the signed value
Fa val .
It Fn prop_number_equals_unsigned_integer "prop_number_t number" \
   "uint64_t val"
Returns
Dv TRUE
if the object's value is equivalent to the unsigned value
Fa val .
El
Sh SEE ALSO
Xr prop_array 3 ,
Xr prop_bool 3 ,
Xr prop_data 3 ,
Xr prop_dictionary 3 ,
Xr prop_object 3 ,
Xr prop_string 3 ,
Xr proplib 3
Sh HISTORY
The
Nm proplib
property container object library first appeared in
Nx 4.0 .

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