From 3302fd108858cec8bf70fb56a14145775a6d3861 Mon Sep 17 00:00:00 2001
From: rimathia <rimathia@users.noreply.github.com>
Date: Sun, 8 Nov 2020 19:36:00 +0100
Subject: [PATCH] use memchr for searching for '%' in printf format string
 (#1984)

---
 include/fmt/printf.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/fmt/printf.h b/include/fmt/printf.h
index 8c28ac23..b44afaba 100644
--- a/include/fmt/printf.h
+++ b/include/fmt/printf.h
@@ -474,8 +474,11 @@ OutputIt basic_printf_context<OutputIt, Char>::format() {
   const Char* end = parse_ctx_.end();
   auto it = start;
   while (it != end) {
+    if (!detail::find<false, Char>(it, end, '%', it)) {
+      it = end;  // detail::find leaves it == nullptr if it doesn't find '%'
+      break;
+    }
     char_type c = *it++;
-    if (c != '%') continue;
     if (it != end && *it == c) {
       out = std::copy(start, it, out);
       start = ++it;