Directory restructuring.

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/test_util.h b/tests/test_util.h
new file mode 100644
index 0000000..a998a19
--- /dev/null
+++ b/tests/test_util.h
@@ -0,0 +1,53 @@
+/* Function for printing numbers using si prefixes (k, M, G, etc.).
+ * From http://www.cs.tut.fi/~jkorpela/c/eng.html */
+
+#define PREFIX_START (-24)
+/* Smallest power of then for which there is a prefix defined.
+   If the set of prefixes will be extended, change this constant
+   and update the table "prefix". */
+
+#include <stdio.h>
+#include <math.h>
+
+static char *eng(double value, int digits, int numeric)
+{
+  static const char *prefix[] = {
+  "y", "z", "a", "f", "p", "n", "u", "m", "",
+  "k", "M", "G", "T", "P", "E", "Z", "Y"
+  };
+#define PREFIX_END (PREFIX_START+\
+(int)((sizeof(prefix)/sizeof(char *)-1)*3))
+
+      int expof10;
+      static char result[100];
+      char *res = result;
+
+      if (value < 0.)
+        {
+            *res++ = '-';
+            value = -value;
+        }
+
+      expof10 = (int) log10(value);
+      if(expof10 > 0)
+        expof10 = (expof10/3)*3;
+      else
+        expof10 = (-expof10+3)/3*(-3); 
+
+      value *= pow(10,-expof10);
+
+      if (value >= 1000.)
+         { value /= 1000.0; expof10 += 3; }
+      else if(value >= 100.0)
+         digits -= 2;
+      else if(value >= 10.0)
+         digits -= 1;
+
+      if(numeric || (expof10 < PREFIX_START) ||    
+                    (expof10 > PREFIX_END))
+        sprintf(res, "%.*fe%d", digits-1, value, expof10); 
+      else
+        sprintf(res, "%.*f %s", digits-1, value, 
+          prefix[(expof10-PREFIX_START)/3]);
+      return result;
+}