From 7eb5e3f5835191d959df0b8eab1e8322365ad007 Mon Sep 17 00:00:00 2001
From: andargunov <tolik_azo@mail.ru>
Date: Tue, 6 Oct 2020 17:19:54 +0300
Subject: [PATCH] Added an if expression for the individual case described in
 fmtlib/fmt/issues/1917.

Adjusts the length of the number to match the precision for the exponential number format.
---
 include/fmt/format-inl.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/fmt/format-inl.h b/include/fmt/format-inl.h
index 80e0f8f4..dfeff767 100644
--- a/include/fmt/format-inl.h
+++ b/include/fmt/format-inl.h
@@ -2468,6 +2468,15 @@ int format_float(T value, int precision, float_specs specs, buffer<char>& buf) {
   } else {
     exp -= cached_exp10;
     buf.try_resize(to_unsigned(handler.size));
+    if ((specs.format == detail::float_format::exp) && (buf.size() > precision)) {
+      if (exp < 0) {
+        exp += (buf.size() - precision);
+      }
+      else {
+        exp -= (buf.size() - precision);
+      }
+      buf.try_resize(to_unsigned(precision));
+    }
   }
   if (!fixed && !specs.showpoint) {
     // Remove trailing zeros.