common/helpers: add double_cmp helper function

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

2 files changed, 16 insertions, 0 deletions

diff --git a/tests/common/helpers.cpp b/tests/common/helpers.cpp
index 8f1f0fe..f07b3df 100644
--- a/tests/common/helpers.cpp
+++ b/tests/common/helpers.cpp
@@ -27,6 +27,8 @@
 #endif
 #include "helpers.h"
 
+#include <math.h>
+
 #include <sstream>
 #include <fstream>
 
@@ -289,3 +291,10 @@ bool SearchFileForString(const std::string &path, const std::string &substring)
 
     return false;
 }
+
+int double_cmp(double a, double b, int precision)
+{
+    int ai = (int)round(a * pow(10, precision));
+    int bi = (int)round(b * pow(10, precision));
+    return (ai > bi) ? 1 : (ai < bi) ? -1 : 0;
+}
diff --git a/tests/common/helpers.h b/tests/common/helpers.h
index 1cf3449..ac23ddb 100644
--- a/tests/common/helpers.h
+++ b/tests/common/helpers.h
@@ -175,5 +175,12 @@ bool NoEventPending(Display *dpy);
  * false otherwise.
  */
 bool SearchFileForString(const std::string &path, const std::string &substring);
+
+/**
+ * Compare two doubles for equality within the given precision.
+ *
+ * @return 1, 0, -1 if a is larger, equal, or less than b, respectively
+ */
+int double_cmp(double a, double b, int precision = 2);
 #endif