Tweaks to bitset.h, established a C test framework.

Rakefile

@@ -5,6 +5,9 @@ OBJECTS = SOURCES.map { |s| "#{s}.o" }
 LIBS    = %w( pthread )
 CCFLAGS = %w( -Wall )
 LDFLAGS = []
+LIBCHECK = "/usr/lib/libcheck.a"
+
+TEST_MODULES = Dir["tests/check_*.c"].map { |n| n[12..-3] }
 
 if DEBUG
   LDFLAGS << ["-g"]
@@ -14,17 +17,39 @@ end
 
 rule 'default' => 'flexnbd'
 
-rule 'flexnbd' => OBJECTS do |t|
+namespace "test" do
+  task 'build' => TEST_MODULES.map { |n| "tests/check_#{n}" }
+  task 'run' => 'build' do
+    TEST_MODULES.each do |n|
+      ENV['EF_DISABLE_BANNER'] = '1'
+      sh "./tests/check_#{n}"
+    end
+  end
+end
+
+def gcc_link(target, objects)
   sh "gcc #{LDFLAGS.join(' ')} "+
     LIBS.map { |l| "-l#{l}" }.join(" ")+
-    " -o #{t.name} "+
-    t.sources.join(" ")
+    " -o #{target} "+
+    objects.join(" ")
+end
+
+rule 'flexnbd' => OBJECTS do |t|
+  gcc_link(t.name, t.sources)
+end
+
+rule(/tests\/check_[a-z]+$/ => [ proc { |target| target+".o" } ]) do |t|
+  gcc_link(t.name, t.sources + [LIBCHECK])
 end
 
 rule '.o' => '.c' do |t|
-  sh "gcc -c #{CCFLAGS.join(' ')} -o #{t.name} #{t.source} "
+  sh "gcc -I. -c #{CCFLAGS.join(' ')} -o #{t.name} #{t.source} "
 end
 
 rule 'clean' do
-  sh "rm -f flexnbd "+OBJECTS.join(" ")
+  sh "rm -f flexnbd " + (
+    OBJECTS + 
+    TEST_MODULES.map { |n| ["tests/check_#{n}", "tests/check_#{n}.o"] }.flatten
+  ).
+  join(" ")
 end