From 0c92076a142a9700b1bdbfcf8c1104b9ce05bfe0 Mon Sep 17 00:00:00 2001
From: supermerill <merill@free.fr>
Date: Tue, 4 Jan 2022 18:38:21 +0100
Subject: [PATCH] Fix to_string_nozero formatter when rounded without any '.'.
 supermerill/SuperSlicer#2172

---
 src/libslic3r/GCodeWriter.cpp | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/src/libslic3r/GCodeWriter.cpp b/src/libslic3r/GCodeWriter.cpp
index 20c24982f..d13ddf1bc 100644
--- a/src/libslic3r/GCodeWriter.cpp
+++ b/src/libslic3r/GCodeWriter.cpp
@@ -35,16 +35,18 @@ std::string to_string_nozero(double value, int32_t max_precision) {
         ss << std::fixed << std::setprecision(int(std::min(15 - long10, int(max_precision)))) << value;
         std::string ret = ss.str();
         uint8_t nb_del = 0;
-        uint8_t idx_char;
-        for (idx_char = uint8_t(ss.tellp()) - 1; idx_char > 0; idx_char--) {
-            if (ret[idx_char] == '0')
+        if (ret.find('.') != std::string::npos) {
+            uint8_t idx_char;
+            for (idx_char = uint8_t(ss.tellp()) - 1; idx_char > 0; idx_char--) {
+                if (ret[idx_char] == '0')
+                    nb_del++;
+                else
+                    break;
+            }
+            // remove the '.' at the end of the int
+            if (idx_char > 0 && ret[idx_char] == '.')
                 nb_del++;
-            else
-                break;
         }
-        // remove the '.' at the end of the int
-        if(idx_char > 0 && ret[idx_char] == '.')
-            nb_del++;
 
         if (nb_del > 0)
             return ret.substr(0, ret.size() - nb_del);