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home | helpPROP_NUMBER(3) BSD Library Functions Manual PROP_NUMBER(3)NAMEprop_number,prop_number_create_integer,prop_number_create_unsigned_integer,prop_number_copy,prop_number_size,prop_number_unsigned,prop_number_integer_value,prop_number_unsigned_integer_value,prop_number_equals,prop_number_equals_integer,prop_number_equals_unsigned_integer-- numeric value property objectLIBRARYProperty Container Object Library (libprop, -lprop)SYNOPSIS#include<prop/proplib.h>prop_number_tprop_number_create_integer(int64_tval);prop_number_tprop_number_create_unsigned_integer(uint64_tval);prop_number_tprop_number_copy(prop_number_tnumber);intprop_number_size(prop_number_tnumber);boolprop_number_unsigned(prop_number_tnumber);int64_tprop_number_integer_value(prop_number_tnumber);uint64_tprop_number_unsigned_integer_value(prop_number_tnumber);boolprop_number_equals(prop_number_tnum1,prop_number_tnum2);boolprop_number_equals_integer(prop_number_tnumber,int64_tval);boolprop_number_equals_unsigned_integer(prop_number_tnumber,uint64_tval);DESCRIPTIONTheprop_numberfamily of functions operate on a numeric value property object type. Values are either signed or unsigned, and promoted to a 64-bit type (int64_t or uint64_t, respectively). 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:+oSigned numbers that are greater than or equal to 0 can be compared to unsigned numbers.+oUnsigned numbers that are less than or equal to the largest signed 64-bit value (INT64_MAX) can be compared to signed numbers. Number objects have a different externalized representation depending on their sign:+oSigned numbers are externalized in base-10 (decimal).+oUnsigned numbers are externalized in base-16 (hexadecimal). When numbers are internalized, the sign of the resulting number object (and thus its valid range) is determined by a set of rules evaluated in the following order:+oIf the first character of the number is a '-' then the number is signed.+oIf the first two characters of the number are '0x' then the number is unsigned.+oIf the number value fits into the range of a signed number then the number is signed.+oIn all other cases, the number is unsigned.prop_number_create_integer(int64_tval) Create a numeric value object with the signed valueval. Returns NULL on failure.prop_number_create_unsigned_integer(uint64_tval) Create a numeric value object with the unsigned valueval. Returns NULL on failure.prop_number_copy(prop_number_tnumber) Copy a numeric value object. If the supplied object isn't a numeric value, NULL is returned.prop_number_size(prop_number_tnumber) Returns 8, 16, 32, or 64, representing the number of bits required to hold the value of the object. If the supplied object isn't a numeric value, NULL is returned.prop_number_unsigned(prop_number_tnumber) Returns true if the numeric value object has an unsigned value.prop_number_integer_value(prop_number_tnumber) Returns the signed integer value of the numeric value object. If the supplied object isn't a numeric value, zero is returned. Thus, it is not possible to distinguish between "not a prop_number_t" and "prop_number_t has a value of 0".prop_number_unsigned_integer_value(prop_number_tnumber) Returns the unsigned integer value of the numeric value object. If the supplied object isn't a numeric value, zero is returned. Thus, it is not possible to distinguish between "not a prop_number_t" and "prop_number_t has a value of 0".prop_number_equals(prop_number_tnum1,prop_number_tnum2) Returns true if the two numeric value objects are equivalent. If at least one of the supplied objects isn't a numeric value, false is returned.prop_number_equals_integer(prop_number_tnumber,int64_tval) Returns true if the object's value is equivalent to the signed valueval. If the supplied object isn't a numerical value or ifvalexceeds INT64_MAX, false is returned.prop_number_equals_unsigned_integer(prop_number_tnumber,uint64_tval) Returns true if the object's value is equivalent to the unsigned valueval. If the supplied object isn't a numerical value or ifvalexceeds INT64_MAX, false is returned.SEE ALSOprop_array(3), prop_bool(3), prop_data(3), prop_dictionary(3), prop_object(3), prop_string(3), proplib(3)HISTORYTheproplibproperty container object library first appeared in NetBSD 4.0. BSD January 21, 2008 BSD

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