libsaria: Create a library path iterator

This makes it easier to loop over all the library paths without needing
to know anything about implementation.  I modified the update functions
to use the new way, so it should be ready for use by the UI.

Signed-off-by: Bryan Schumaker <bjschuma@gmail.com>

include/libsaria/library.h

@@ -10,6 +10,9 @@ using namespace std;
 
 namespace libsaria
 {
+
+	class LibraryPath;
+
 	namespace library
 	{
 
@@ -20,6 +23,13 @@ namespace libsaria
 			bool end();
 		} /* Namespace: iter */
 
+		namespace pathiter
+		{
+			void reset();
+			libsaria::LibraryPath *next();
+			bool end();
+		}
+
 		struct PathInfo {
 			string path;
 			unsigned int size;

libsaria/library/iter.cpp

@@ -0,0 +1,30 @@
+// Copyright Bryan Schumaker 2012
+
+#include "library.h"
+
+static list<libsaria::LibraryPath>::iterator it;
+
+namespace libsaria
+{
+	namespace library
+	{
+
+		void pathiter::reset()
+		{
+			it = path_list.begin();
+		}
+
+		libsaria::LibraryPath *pathiter::next()
+		{
+			libsaria::LibraryPath *path = &(*it);
+			it++;
+			return path;
+		}
+
+		bool pathiter::end()
+		{
+			return it == path_list.end();
+		}
+
+	} /* Namespace: library */
+}; /* Namespace: libsaria */

libsaria/library/library.cpp

@@ -10,10 +10,10 @@ using namespace std;
 
 list<libsaria::LibraryPath> path_list;
 
-static void do_update(list<libsaria::LibraryPath>::iterator it)
+static void do_update(libsaria::LibraryPath *path)
 {
-	it->validate();
-	it->update();
+	path->validate();
+	path->update();
 }
 
 namespace libsaria
@@ -28,17 +28,20 @@ namespace libsaria
 
 	void library::update()
 	{
-		list<LibraryPath>::iterator it;
-		for (it = path_list.begin(); it != path_list.end(); it++)
-			do_update(it);
+		pathiter::reset();
+		while (!pathiter::end())
+			do_update(pathiter::next());
 	}
 
 	void library::update_path(string dir)
 	{
-		list<LibraryPath>::iterator it;
-		for (it = path_list.begin(); it != path_list.end(); it++) {
-			if (it->get_path() == dir)
-				do_update(it);
+		LibraryPath *path;
+
+		pathiter::reset();
+		while (!pathiter::end()) {
+			path = pathiter::next();
+			if (path->get_path() == dir)
+				do_update(path);
 		}
 	}