add unit tests to bstr* functions

bstr_diff.c

@@ -19,8 +19,49 @@ int bstr_diff(const char* a,const char* b) {
     } else
       if (b==B)
 	return 1;
-    if ((j=(*a-*b))) break;
+    if ((j=((unsigned char)*a-(unsigned char)*b))) break;
     ++a; ++b;
   }
   return j;
 }
+
+#ifdef UNITTEST
+#include <assert.h>
+
+int main() {
+  assert(str_diff("bar","foo") < 0);
+  assert(str_diff("foo","bar") > 0);
+  assert(str_diff("foo1","foo") > 0);
+  assert(str_diff("foo","foo1") < 0);
+  assert(str_diff("foo","foo") == 0);
+
+  assert(bstr_diff("bar","foo") < 0);
+  assert(bstr_diff("foo","bar") > 0);
+  assert(bstr_diff("foo1","foo") > 0);
+  assert(bstr_diff("foo","foo1") < 0);
+  assert(bstr_diff("foo","foo") == 0);
+
+  assert(bstr_diff("bar","\x00\x03\x00\x00\x00""foo") < 0);
+  assert(bstr_diff("foo","\x00\x03\x00\x00\x00""bar") > 0);
+  assert(bstr_diff("foo1","\x00\x03\x00\x00\x00""foo") > 0);
+  assert(bstr_diff("foo","\x00\x04\x00\x00\x00""foo1") < 0);
+  assert(bstr_diff("foo","\x00\x03\x00\x00\x00""foo") == 0);
+
+  assert(bstr_diff("\x00\x03\x00\x00\x00""bar","\x00\x03\x00\x00\x00""foo") < 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","\x00\x03\x00\x00\x00""bar") > 0);
+  assert(bstr_diff("\x00\x04\x00\x00\x00""foo1","\x00\x03\x00\x00\x00""foo") > 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","\x00\x04\x00\x00\x00""foo1") < 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","\x00\x03\x00\x00\x00""foo") == 0);
+
+  assert(bstr_diff("\x00\x03\x00\x00\x00""bar","foo") < 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","bar") > 0);
+  assert(bstr_diff("\x00\x04\x00\x00\x00""foo1","foo") > 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","foo1") < 0);
+  assert(bstr_diff("\x00\x03\x00\x00\x00""foo","foo") == 0);
+
+  assert(bstr_diff("\x00\x05\x00\x00\x00""f\x00ord","fnord") < 0);
+  assert(bstr_diff("\x00\x05\x00\x00\x00""f\x00ord","\x00\x05\x00\x00\x00""f\x00ort") < 0);
+
+  assert(bstr_diff("\x00\x03\x00\x00\x00""f\xf6o","foo") > 0);
+}
+#endif