From a88a3a3f58c9a64d954778b57c6449266f36bf33 Mon Sep 17 00:00:00 2001
From: Andrew Belt <andrewpbelt@gmail.com>
Date: Sat, 26 Jan 2019 12:43:48 -0500
Subject: [PATCH] Add SI prefixes parsing to Quantity::setDisplayValue

---
 src/ui/Quantity.cpp | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/ui/Quantity.cpp b/src/ui/Quantity.cpp
index b74ade6e..6f944de2 100644
--- a/src/ui/Quantity.cpp
+++ b/src/ui/Quantity.cpp
@@ -14,10 +14,23 @@ std::string Quantity::getDisplayValueString() {
 }
 
 void Quantity::setDisplayValueString(std::string s) {
-	float displayValue = 0.f;
-	int n = std::sscanf(s.c_str(), "%f", &displayValue);
-	if (n == 1)
-		setDisplayValue(displayValue);
+	float v = 0.f;
+	char suffix[2];
+	int n = std::sscanf(s.c_str(), "%f%1s", &v, suffix);
+	if (n >= 2) {
+		// Parse SI prefixes
+		switch (suffix[0]) {
+			case 'n': v *= 1e-9f; break;
+			case 'u': v *= 1e-6f; break;
+			case 'm': v *= 1e-3f; break;
+			case 'k': v *= 1e3f; break;
+			case 'M': v *= 1e6f; break;
+			case 'G': v *= 1e9f; break;
+			default: break;
+		}
+	}
+	if (n >= 1)
+		setDisplayValue(v);
 }
 
 std::string Quantity::getString() {