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Since XSUBs map to a C function prototype, the return type is automatically mapped and converted to a Perl scalar in the generated code. Although it is relatively rare, we might occasionally want to disregard the return value of a C function that we are binding to (presumably not under our control or we could just rewrite it) on the grounds that it serves no useful purpose and therefore wastes Perl s time reading it back. Since we cannot simply declare the subroutine void, we instead use NO_OUTPUT to tell xsubpp not to build the code to manage the return value: NO_OUTPUT int returns_a_useless_value() This example XSUB also takes no arguments, so it has no list of argument declarations either. At a bare minimum, therefore, a C subroutine that takes no arguments and returns no values can be bound to in just two lines of XS code. Of course, most useful subroutines will both take arguments and return values. We can manage fixed and variable numbers of both input arguments and output values, but we can only do so much with a simple XSUB declaration for more advanced uses we will need to add some code.

An XSUB declaration allows us to map a Perl subroutine call onto a preexisting C subroutine of the same name. However, sometimes we do not want to make a direct mapping, either because we need to wrap the C routine in some additional logic before providing it to Perl or because we want to improve on C s calling semantics. C, after all, can only return a single value, while Perl is happy to handle a list. We can also forego the C subroutine altogether and embed the C code directly into the XSUB definition. The following example embeds some simple C code that returns the number of times the lower of the two numbers passed will fit into the larger: int heavyfraction(num1, num2) int num1 int num2 CODE: if (num1 > num2) {

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RETVAL = num1 / num2; } else { RETVAL = num2 / num1; } OUTPUT: RETVAL The code in the CODE section is all standard C, apart from the special variable RETVAL. This macro is automatically defined to be a variable of the same type as the functions return type in this case, int and it is automatically placed into a scalar and pushed onto Perl s stack after our code completes so that Perl can receive the computed value when no CODE or PPCODE is present. The OUTPUT block here declares what the XSUB returns to Perl. Here it is technically not needed, since RETVAL is automatically returned for any XSUB with a nonvoid return type. It is good form to include it though, because it helps to underline that our subroutine is returning a value. In this example, we can make use of just the argument variables and RETVAL to perform the calculation. If we need to create any intermediate values, which is highly likely, we will need to declare them. We can simply declare a local variable at the top of the CODE block, but we are better advised to use PREINIT, so that the generated code places them at the start of the generated function correctly. The next example replaces RETVAL with an explicit and more meaningfully named variable, to illustrate both use of PREINIT and returning something other than RETVAL: int difference(num1, num2) int num1 int num2 PREINIT: int delta; CODE: delta = abs(num1 - num2); OUTPUT: delta We can place simple expressions into the OUTPUT section too, which allows us to create this alternative implementation with no CODE section at all: int difference(num1, num2) int num1 int num2 OUTPUT: abs(num1-num2);

To pass parameters as pseudo-attributes, each parameter is treated as an attribute of the tag This is frowned upon as being messy and prone to errors, as well as being an eyesore Listing 3-19 shows the date and offset parameters being passed into the nextdate UDF Listing 3-19 Placing parameters to pass directly into a cfinvoke tag <cfinvoke method="nextdate" returnvariable="tomorrow" date="1/11/1971" offset="1"> In the example in Listing 3-19, it is very hard to tell that date and offset are parameters of the UDF and not normal attributes of the cfinvoke tag In all of the examples so far, the cfinvoke tag has been used without any optional closing tag When using the second way of passing parameters to a UDF, the closing tag is required The cfinvokeargument tag is a subtag of cfinvoke and can be used only within a cfinvoke block.

CODE and OUTPUT work well when we only have one return value to pass back. The generated C code will manage the job of postprocessing the return value into a suitable form to be placed on the Perl interpreter stack, based on the declared return value of the XSUB. If we have more than one value to pass back though, we cannot use the C function prototype. Instead, we replace CODE with PPCODE, delete the OUTPUT section, and manage the stack ourselves: int countdown_list(message, from=10, to=0) int from int to PREINIT: int delta, i; PPCODE:

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