Don't use filesystem

src/algorithms/signal_source/gnuradio_blocks/labsat23_source.cc

@@ -20,17 +20,7 @@
 #include "labsat23_source.h"
 #include "INIReader.h"
 #include "command_event.h"
-#include <gnuradio/io_signature.h>
-#include <algorithm>
-#include <array>
 #include <bitset>
-#include <cstdint>
-#include <exception>
-#include <filesystem>
-#include <iomanip>
-#include <iostream>
-#include <memory>
-#include <sstream>
 
 #if HAS_BOOST_ENDIAN
 #include <boost/endian/conversion.hpp>
@@ -102,6 +92,33 @@ void read_file_register_to_local_endian(std::ifstream &binary_input_file, uint64
 #endif
 }
 
+std::string get_extension(const std::string &path)
+{
+    size_t slash_pos = path.find_last_of("/\\");  // handle directories
+    size_t dot_pos = path.find_last_of('.');
+
+    // No dot or dot is in the directory part → no extension
+    if (dot_pos == std::string::npos || (slash_pos != std::string::npos && dot_pos < slash_pos))
+        {
+            return "";  // no extension
+        }
+
+    return path.substr(dot_pos);  // includes the dot
+}
+
+std::string replace_extension(const std::string &path, const std::string &new_ext)
+{
+    const auto dot_pos = path.find_last_of('.');
+    if (dot_pos == std::string::npos)
+        {
+            return path + new_ext;  // no extension just append
+        }
+    else
+        {
+            return path.substr(0, dot_pos) + new_ext;
+        }
+}
+
 }  // namespace
 
 
@@ -146,11 +163,10 @@ labsat23_source::labsat23_source(const char *signal_file_basename,
                     std::cout << "LabSat file version 4 detected.\n";
                 }
 
-            std::filesystem::path file_path(signal_file);
-            file_path.replace_extension(".ini");
+            const auto ini_file = replace_extension(signal_file, ".ini");
 
             // Read ini file
-            if (read_ls3w_ini(file_path) != 0)
+            if (read_ls3w_ini(ini_file) != 0)
                 {
                     exit(1);
                 }
@@ -192,8 +208,7 @@ labsat23_source::~labsat23_source()
 
 std::string labsat23_source::generate_filename()
 {
-    std::filesystem::path file_path(d_signal_file_basename);
-    const auto extension = file_path.extension();
+    const auto extension = get_extension(d_signal_file_basename);
 
     if (extension == ".ls2" or extension == ".LS2")
         {