Index: apps/plugins/md5sum.c
===================================================================
--- apps/plugins/md5sum.c	(revision 18163)
+++ apps/plugins/md5sum.c	(working copy)
@@ -21,9 +21,12 @@
 
 #include "plugin.h"
 #include "lib/md5.h"
+#include "pluginlib_actions.h"
 
 PLUGIN_HEADER
 
+#define MD5SUM_QUIT PLA_QUIT
+
 static const struct plugin_api *rb;
 
 MEM_FUNCTION_WRAPPERS(rb);
@@ -50,6 +53,14 @@
     return 0;
 }
 
+static bool userquit( void )
+{
+    static bool quit = false;
+    if (!quit && rb->button_get(false) == MD5SUM_QUIT)
+        quit = true;
+    return quit;
+}
+
 static void hash_file( int out, const char *path )
 {
     if( out < 0 )
@@ -66,10 +77,11 @@
         rb->write( out, "  ", 2 );
         rb->write( out, path, rb->strlen( path ) );
         rb->write( out, "\n", 1 );
+        
+        rb->yield();
     }
 }
 
-static void hash_dir( int out, const char *path );
 static void hash_dir( int out, const char *path )
 {
     DIR *dir;
@@ -78,7 +90,7 @@
     dir = rb->opendir( path );
     if( dir )
     {
-        while( ( entry = rb->readdir( dir ) ) )
+        while( !userquit() && ( entry = rb->readdir( dir ) ) )
         {
             char childpath[MAX_PATH];
             rb->snprintf( childpath, MAX_PATH, "%s/%s",
@@ -108,7 +120,7 @@
     char newpath[MAX_PATH];
     if( list < 0 ) return;
 
-    while( rb->read_line( list, newpath, MAX_PATH ) > 0 )
+    while( !userquit() && rb->read_line( list, newpath, MAX_PATH ) > 0 )
     {
         DIR *dir = rb->opendir( newpath );
         if( dir )
@@ -132,7 +144,8 @@
     int len;
     if( list < 0 ) return;
 
-    while( ( len = rb->read_line( list, line, MD5_STRING_LENGTH+1+MAX_PATH+1 ) ) > 0 )
+    while( !userquit()
+           && ( len = rb->read_line( list, line, MD5_STRING_LENGTH+1+MAX_PATH+1 ) ) > 0 )
     {
         if( out < 0 )
             count++;