1 files changed, 36 insertions, 0 deletions
diff --git a/core/string_helpers.hpp b/core/string_helpers.hpp
new file mode 100644
index 0000000..a35448b
--- /dev/null
+++ b/core/string_helpers.hpp
@@ -0,0 +1,36 @@
+#ifndef M6lbZdsknZWfvEr3i3hoi7EZO8M
+#define M6lbZdsknZWfvEr3i3hoi7EZO8M
+
+#include <math.h>
+#include <sstream>
+#include <string>
+
+template<int> struct SISuffix { };
+
+const char microSISuffixName[6] = { 'm', '~', 'n', 'p', 'f', 'a' };
+const char macroSISuffixName[7] = { 'K', 'M', 'G', 'T', 'P', 'E', 'Y' };
+
+int calcSISuffixId(double val, int base=1000) {
+  if (val >= base) return  1 + calcSISuffixId(val / base);
+  if (val < 1)     return -1 + calcSISuffixId(val * base);
+  return 0;
+}
+
+std::string SISuffixify(double val, int base=1000) {
+  int id = calcSISuffixId(val, base);
+  assert(id >= -6);
+  assert(id <= 7);
+
+  std::ostringstream result;
+
+  result << val / pow(base, id) << " ";
+  if (id < 0)
+    result << microSISuffixName[-id - 1];
+  if (id > 0)
+    result << macroSISuffixName[ id - 1];
+
+  return result.str();
+}
+
+
+#endif // M6lbZdsknZWfvEr3i3hoi7EZO8M