/usr/lib/ruby/vendor_ruby/ffi/variadic.rb is in ruby-ffi 1.9.10debian-1build2.
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# Copyright (C) 2008, 2009 Wayne Meissner
# Copyright (C) 2009 Luc Heinrich
#
# This file is part of ruby-ffi.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the Ruby FFI project nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
module FFI
class VariadicInvoker
def init(arg_types, type_map)
@fixed = Array.new
@type_map = type_map
arg_types.each_with_index do |type, i|
@fixed << type unless type == Type::VARARGS
end
end
def call(*args, &block)
param_types = Array.new(@fixed)
param_values = Array.new
@fixed.each_with_index do |t, i|
param_values << args[i]
end
i = @fixed.length
while i < args.length
param_types << FFI.find_type(args[i], @type_map)
param_values << args[i + 1]
i += 2
end
invoke(param_types, param_values, &block)
end
#
# Attach the invoker to module +mod+ as +mname+
#
def attach(mod, mname)
invoker = self
params = "*args"
call = "call"
mod.module_eval <<-code
@@#{mname} = invoker
def self.#{mname}(#{params})
@@#{mname}.#{call}(#{params})
end
def #{mname}(#{params})
@@#{mname}.#{call}(#{params})
end
code
invoker
end
end
end
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