Fix some log entries not being output with a newline.

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0),
 and this project roughly adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed some log entries not being output with a newline.
+
 ## [1.1.3] - 2024-06-14
 
 ### Fixed

src/libretro/environment.cpp

@@ -300,13 +300,12 @@ constexpr uint32_t GetLogColor(retro_log_level level) noexcept {
 void retro::fmt_log(retro_log_level level, fmt::string_view fmt, fmt::format_args args) noexcept {
     fmt::basic_memory_buffer<char, 1024> buffer;
     fmt::vformat_to(std::back_inserter(buffer), fmt, args);
-    // We can't pass the va_list directly to the libretro callback,
-    // so we have to construct the string and print that
 
-    if (buffer[buffer.size() - 1] == '\n')
-        buffer[buffer.size() - 1] = '\0';
+    if (buffer[buffer.size() - 1] != '\n')
+        // If the string doesn't end with a newline...
+        buffer.push_back('\n');
 
-    buffer.push_back('\n');
+    // vformat_to doesn't append a null terminator, so we have to do it ourselves
     buffer.push_back('\0');
 
     if (_log) {