implementing portable directory scanner in preset loader

git-svn-id: https://projectm.svn.sourceforge.net/svnroot/projectm/personal/carm/dev-1.0@228 6778bc44-b910-0410-a7a0-be141de4315d

src/projectM-engine/PresetLoader.cpp

@@ -11,19 +11,75 @@
 //
 #include "PresetLoader.hpp"
 #include <iostream>
+
 extern "C" {
 #include <errno.h>
+#include <linux/types.h>
+#include <linux/dirent.h>
+
 }
 
 PresetLoader::PresetLoader(std::string pathame) {
-
-	// Initialize a directory watcher
-	#ifdef LINUX
-	if ((m_notifyFD = inotify_init()) == -1) {
-		std::cerr << "[PresetLoader] failed to initialize inotify instance (error " << errno << std::endl;
-	}
-	#endif
-
-	
 }
 
+
+void PresetLoader::rescan() {
+
+// If directory already opened, close it first
+ if (m_dir) {
+	closedir(dir);
+ } 
+
+// Allocate a new a stream given the current diectory name
+if ((m_dir = opendir(m_dirname)) == NULL) {
+	handleDirectoryError();
+}
+
+std::string fullPath;
+std::ostringstream out(fullPath);
+
+struct dirent * dir_entry;
+while ((dir_entry = readdir(m_dir)) != NULL) {
+
+	// Convert char * to friendly string
+	std::string filename(dir_entry->d_name);
+	
+	// Verify extension is projectm or milkdrop
+	if (filename.rfind(PROJECTM_FILE_EXTENSION) <= 0
+		|| filename.rfind(MILKDROP_FILE_EXTENSION) <= 0)
+		continue;
+
+	// Create full path name
+	out << dirname << PATH_SEPARATOR << filename;
+
+	// Save to our directory entry collcetion
+	m_entries.add(out.str());
+
+	// We can now toss out the directory entry struct
+	free(dir_entry);
+
+}
+
+}
+
+
+void PresetLoader::handleDirectoryError() {	
+	switch (errno) {
+		case ENOENT:
+			break;		
+		case ENOMEM:
+			abort();
+		case ENOTDIR:
+			break;
+		case ENFILE:
+			std::cerr << "[PresetLoader] Your system has reached its open file limit. Giving up..." << std::endl;
+			abort();
+		case EMFILE:
+			std::cerr << "[PresetLoader] too many files in use by projectM! Bailing!" << std::endl;
+			abort();
+		case EACCES:
+			break;
+		default:
+			break;
+	}
+}