From a9b5da8facc22334d0bbffcc3517057a16da0a9b Mon Sep 17 00:00:00 2001
From: Raul Metsma <raul@metsma.ee>
Date: Sun, 16 Feb 2025 20:53:27 +0200
Subject: [PATCH] Fix stream writing to correct position

Signed-off-by: Raul Metsma <raul@metsma.ee>
---
 lib/libpcsc-cpp/src/utils.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/libpcsc-cpp/src/utils.cpp b/lib/libpcsc-cpp/src/utils.cpp
index fcb8c40..8a8db29 100644
--- a/lib/libpcsc-cpp/src/utils.cpp
+++ b/lib/libpcsc-cpp/src/utils.cpp
@@ -79,8 +79,10 @@ std::ostream& operator<<(std::ostream& os, const pcsc_cpp::byte_vector& data)
 
 std::string operator+(std::string lhs, const byte_vector& rhs)
 {
+    auto pos = lhs.size();
     lhs.reserve(lhs.size() + rhs.size() * 2);
     std::ostringstream hexStringBuilder(std::move(lhs));
+    hexStringBuilder.seekp(std::streamoff(pos));
     hexStringBuilder << rhs;
     return hexStringBuilder.str();
 }