From c972a63c8cbee7fa8d6d5af2cbbecb8c75ee561a Mon Sep 17 00:00:00 2001
From: Michael Lutz <michi@icosahedron.de>
Date: Sun, 17 May 2020 23:32:10 +0200
Subject: Codechange: Store info about the dedicated server log file in globals
 with automatic destruction to simplify control flow in openttd_main.

---
 src/dedicated.cpp | 14 ++++++++------
 src/fileio.cpp    |  5 +++--
 src/fileio_func.h |  8 ++++++++
 src/openttd.cpp   | 29 +++++++----------------------
 4 files changed, 26 insertions(+), 30 deletions(-)

diff --git a/src/dedicated.cpp b/src/dedicated.cpp
index 8ab035e61..fe3cd7cfb 100644
--- a/src/dedicated.cpp
+++ b/src/dedicated.cpp
@@ -8,9 +8,11 @@
 /** @file dedicated.cpp Forking support for dedicated servers. */
 
 #include "stdafx.h"
+#include "fileio_func.h"
+#include <string>
 
-char *_log_file = nullptr; ///< File to reroute output of a forked OpenTTD to
-FILE *_log_fd   = nullptr; ///< File to reroute output of a forked OpenTTD to
+std::string _log_file; ///< File to reroute output of a forked OpenTTD to
+std::unique_ptr<FILE, FileDeleter> _log_fd; ///< File to reroute output of a forked OpenTTD to
 
 #if defined(UNIX)
 
@@ -38,17 +40,17 @@ void DedicatedFork()
 
 		case 0: { // We're the child
 			/* Open the log-file to log all stuff too */
-			_log_fd = fopen(_log_file, "a");
-			if (_log_fd == nullptr) {
+			_log_fd.reset(fopen(_log_file.c_str(), "a"));
+			if (!_log_fd) {
 				perror("Unable to open logfile");
 				exit(1);
 			}
 			/* Redirect stdout and stderr to log-file */
-			if (dup2(fileno(_log_fd), fileno(stdout)) == -1) {
+			if (dup2(fileno(_log_fd.get()), fileno(stdout)) == -1) {
 				perror("Rerouting stdout");
 				exit(1);
 			}
-			if (dup2(fileno(_log_fd), fileno(stderr)) == -1) {
+			if (dup2(fileno(_log_fd.get()), fileno(stderr)) == -1) {
 				perror("Rerouting stderr");
 				exit(1);
 			}
diff --git a/src/fileio.cpp b/src/fileio.cpp
index 5797c592b..f17a0ffc0 100644
--- a/src/fileio.cpp
+++ b/src/fileio.cpp
@@ -1245,8 +1245,9 @@ void DeterminePaths(const char *exe)
 		free(tmp);
 	}
 
-	extern char *_log_file;
-	_log_file = str_fmt("%sopenttd.log",  _personal_dir);
+	extern std::string _log_file;
+	_log_file = _personal_dir;
+	_log_file += "openttd.log";
 }
 
 /**
diff --git a/src/fileio_func.h b/src/fileio_func.h
index dec193193..d95131880 100644
--- a/src/fileio_func.h
+++ b/src/fileio_func.h
@@ -159,4 +159,12 @@ public:
 	}
 };
 
+/** Helper to manage a FILE with a \c std::unique_ptr. */
+struct FileDeleter {
+	void operator()(FILE *f)
+	{
+		if (f) fclose(f);
+	}
+};
+
 #endif /* FILEIO_FUNC_H */
diff --git a/src/openttd.cpp b/src/openttd.cpp
index 980eb2f13..94c6f4a98 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -543,7 +543,7 @@ int openttd_main(int argc, char *argv[])
 	Dimension resolution = {0, 0};
 	/* AfterNewGRFScan sets save_config to true after scanning completed. */
 	bool save_config = false;
-	AfterNewGRFScan *scanner = new AfterNewGRFScan(&save_config);
+	std::unique_ptr<AfterNewGRFScan> scanner(new AfterNewGRFScan(&save_config));
 	bool dedicated = false;
 	char *debuglog_conn = nullptr;
 
@@ -637,7 +637,7 @@ int openttd_main(int argc, char *argv[])
 			DeterminePaths(argv[0]);
 			if (StrEmpty(mgo.opt)) {
 				ret = 1;
-				goto exit_noshutdown;
+				return ret;
 			}
 
 			char title[80];
@@ -654,12 +654,11 @@ int openttd_main(int argc, char *argv[])
 					GetString(buf, _load_check_data.error, lastof(buf));
 					fprintf(stderr, "%s\n", buf);
 				}
-				goto exit_noshutdown;
+				return ret;
 			}
 
 			WriteSavegameInfo(title);
-
-			goto exit_noshutdown;
+			return ret;
 		}
 		case 'G': scanner->generation_seed = strtoul(mgo.opt, nullptr, 10); break;
 		case 'c': free(_config_file); _config_file = stredup(mgo.opt); break;
@@ -683,8 +682,7 @@ int openttd_main(int argc, char *argv[])
 		BaseSounds::FindSets();
 		BaseMusic::FindSets();
 		ShowHelp();
-
-		goto exit_noshutdown;
+		return ret;
 	}
 
 	DeterminePaths(argv[0]);
@@ -785,8 +783,7 @@ int openttd_main(int argc, char *argv[])
 
 	if (!HandleBootstrap()) {
 		ShutdownGame();
-
-		goto exit_bootstrap;
+		return ret;
 	}
 
 	VideoDriver::GetInstance()->ClaimMousePointer();
@@ -842,8 +839,7 @@ int openttd_main(int argc, char *argv[])
 	CheckForMissingGlyphs();
 
 	/* ScanNewGRFFiles now has control over the scanner. */
-	ScanNewGRFFiles(scanner);
-	scanner = nullptr;
+	ScanNewGRFFiles(scanner.release());
 
 	VideoDriver::GetInstance()->MainLoop();
 
@@ -860,17 +856,6 @@ int openttd_main(int argc, char *argv[])
 
 	/* Reset windowing system, stop drivers, free used memory, ... */
 	ShutdownGame();
-
-exit_noshutdown:
-exit_bootstrap:
-
-	delete scanner;
-
-	extern FILE *_log_fd;
-	if (_log_fd != nullptr) {
-		fclose(_log_fd);
-	}
-
 	return ret;
 }
 
-- 
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