diff --git a/src/fileio.cpp b/src/fileio.cpp
index 2345f7583b..f0bef68d7c 100644
--- a/src/fileio.cpp
+++ b/src/fileio.cpp
@@ -1253,7 +1253,7 @@ uint FileScanner::Scan(const char *extension, Subdirectory sd, bool tars, bool r
  * @return the number of found files, i.e. the number of times that
  *         AddFile returned true.
  */
-uint FileScanner::Scan(const char *extension, const char *directory, bool recursive)
+uint FileScanner::Scan(const char *extension, const std::string &directory, bool recursive)
 {
 	std::string path(directory);
 	AppendPathSeparator(path);
diff --git a/src/fileio_func.h b/src/fileio_func.h
index 93b6123dca..a963b8203b 100644
--- a/src/fileio_func.h
+++ b/src/fileio_func.h
@@ -42,7 +42,7 @@ public:
 	virtual ~FileScanner() {}
 
 	uint Scan(const char *extension, Subdirectory sd, bool tars = true, bool recursive = true);
-	uint Scan(const char *extension, const char *directory, bool recursive = true);
+	uint Scan(const char *extension, const std::string &directory, bool recursive = true);
 
 	/**
 	 * Add a file with the given filename.
diff --git a/src/fios.cpp b/src/fios.cpp
index 265a333c61..6cf83341ec 100644
--- a/src/fios.cpp
+++ b/src/fios.cpp
@@ -410,7 +410,7 @@ static void FiosGetFileList(SaveLoadOperation fop, fios_getlist_callback_proc *c
 	/* Show files */
 	FiosFileScanner scanner(fop, callback_proc, file_list);
 	if (subdir == NO_DIRECTORY) {
-		scanner.Scan(nullptr, _fios_path->c_str(), false);
+		scanner.Scan(nullptr, *_fios_path, false);
 	} else {
 		scanner.Scan(nullptr, subdir, true, true);
 	}
diff --git a/src/script/script_scanner.cpp b/src/script/script_scanner.cpp
index 4035dd649a..cb43fb0d0c 100644
--- a/src/script/script_scanner.cpp
+++ b/src/script/script_scanner.cpp
@@ -28,7 +28,7 @@ bool ScriptScanner::AddFile(const std::string &filename, size_t basepath_length,
 	this->main_script = filename;
 	this->tar_file = tar_filename;
 
-	auto p = this->main_script.rfind(PATHSEPCHAR);
+	auto p = this->main_script.find_last_of(PATHSEPCHAR);
 	this->main_script.erase(p != std::string::npos ? p + 1 : 0);
 	this->main_script += "main.nut";
 
@@ -229,12 +229,11 @@ static bool IsSameScript(const ContentInfo *ci, bool md5sum, ScriptInfo *info, S
 			checksum.AddFile(tar.first, 0, tar_filename);
 		}
 	} else {
-		char path[MAX_PATH];
-		strecpy(path, info->GetMainScript(), lastof(path));
 		/* There'll always be at least 1 path separator character in a script
 		 * main script name as the search algorithm requires the main script to
 		 * be in a subdirectory of the script directory; so <dir>/<path>/main.nut. */
-		*strrchr(path, PATHSEPCHAR) = '\0';
+		const std::string &main_script = info->GetMainScript();
+		std::string path = main_script.substr(0, main_script.find_last_of(PATHSEPCHAR));
 		checksum.Scan(".nut", path);
 	}
 
diff --git a/src/script/squirrel_std.cpp b/src/script/squirrel_std.cpp
index e04ebf4cc9..abcac023ec 100644
--- a/src/script/squirrel_std.cpp
+++ b/src/script/squirrel_std.cpp
@@ -53,18 +53,14 @@ SQInteger SquirrelStd::require(HSQUIRRELVM vm)
 		return SQ_ERROR;
 	}
 
-	char path[MAX_PATH];
-	strecpy(path, si.source, lastof(path));
 	/* Keep the dir, remove the rest */
-	SQChar *s = strrchr(path, PATHSEPCHAR);
-	if (s != nullptr) {
-		/* Keep the PATHSEPCHAR there, remove the rest */
-		s++;
-		*s = '\0';
-	}
-	strecat(path, filename, lastof(path));
+	std::string path = si.source;
+	auto p = path.find_last_of(PATHSEPCHAR);
+	/* Keep the PATHSEPCHAR there, remove the rest */
+	if (p != std::string::npos) path.erase(p + 1);
+	path += filename;
 #if (PATHSEPCHAR != '/')
-	for (char *n = path; *n != '\0'; n++) if (*n == '/') *n = PATHSEPCHAR;
+	std::transform(path.begin(), path.end(), path.begin(), [](char &c) { return c == '/' ? PATHSEPCHAR : c; });
 #endif
 
 	Squirrel *engine = (Squirrel *)sq_getforeignptr(vm);