Add platform-specific functions for path retrieval

Set to use in CLocatorAPI::setup_fs_path.
TODO: need to cover other use cases.

Author: sodat1de

src/xrCore/LocatorAPI.cpp

@@ -760,12 +760,7 @@ void CLocatorAPI::setup_fs_path		(LPCSTR fs_name)
 
 		if (!TryTestPath(full_current_directory))
 		{
-#ifdef IXR_WINDOWS
-			string256 BinPath;
-			int bytes = GetModuleFileNameA(NULL, BinPath, sizeof(BinPath));
-			std::filesystem::path TryPath = BinPath;
-			TryTestPath(TryPath.parent_path());
-#endif
+			TryTestPath(Platform::GetBinaryFolderPath());
 		}
 	}
 

src/xrCore/Platform/Linux/OSFile.h

@@ -140,6 +140,27 @@ namespace Platform
         return NewPath.c_str();
     }
 
+    IC std::filesystem::path GetBinaryFolderPath()
+    {
+        char result[PATH_MAX];
+        ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
+        if (count == -1)
+        {
+            return {};
+        }
+        return std::filesystem::path(std::string(result, count)).parent_path();
+    }
+
+    IC std::string GetModuleName() {
+        char result[PATH_MAX];
+        ssize_t count = readlink("/proc/self/exe", result, PATH_MAX);
+        if (count == -1) 
+        {
+            return {};
+        }
+        return std::string(result, count);
+    }
+
     IC bool OpenFileWnd(char* buffer, size_t sz_buf, FS_Path* P, int start_flt_ext, char flt[1024], LPCSTR offset, bool bMulti)
     {
         return true;

src/xrCore/Platform/Windows/OSFile.h

@@ -19,6 +19,28 @@ namespace Platform
         return NewPath.c_str();
     }
 
+    IC std::filesystem::path GetBinaryFolderPath()
+    {
+        char BinPath[MAX_PATH];
+        int bytes = GetModuleFileNameA(NULL, BinPath, sizeof(BinPath));
+        if (bytes == 0) 
+        {
+            return {};
+        }
+        return std::filesystem::path(BinPath).parent_path();
+    }
+
+    IC std::string GetModuleName()
+    {
+        char ModuleName[MAX_PATH];
+        int bytes = GetModuleFileNameA(NULL, ModuleName, sizeof(ModuleName));
+        if (bytes == 0) 
+        {
+            return {};
+        }
+        return std::string(ModuleName);
+    }
+
     IC const xr_special_char* ValidPath(const xr_special_char* In)
     {
         return In;