dbtool: More fixes to dbtool operation

Now properly treats current directory as "/"

Change-Id: I54357a65f2fda7d2cfb56ff18a044ae10b87bbce

firmware/target/hosted/filesystem-app.c

@@ -43,6 +43,10 @@
 #undef PIVOT_ROOT
 #endif
 
+#if defined(DBTOOL)
+#define PIVOT_ROOT "."
+#endif
+
 #if defined(__PCTOOL__)
 /* We don't want this for tools */
 #undef HAVE_SPECIAL_DIRS
@@ -222,7 +226,7 @@ const char * handle_special_dirs(const char *dir, unsigned flags,
 #define PIVOT_ROOT_LEN (sizeof(PIVOT_ROOT)-1)
     /* Prepend root prefix to find actual path */
     if (strncmp(PIVOT_ROOT, dir, PIVOT_ROOT_LEN)
-#ifdef MULTIDRIVE_DIR
+#if defined(MULTIDRIVE_DIR) && defined(MULTIDRIVE_DIR_LEN)
 	/* Unless it's a MULTIDRIVE dir, in which case use as-is */
 	&& strncmp(MULTIDRIVE_DIR, dir, MULTIDRIVE_DIR_LEN)
 #endif

tools/configure

@@ -4270,7 +4270,7 @@ fi
       simcc "database-sdl"
       toolset='';
       appsdir='$(ROOTDIR)/tools/database';
-      rbdir="./.rockbox"
+
       case $uname in
           CYGWIN*|MINGW*)
               output="database_${modelname}.exe"

tools/database/database.c

@@ -23,41 +23,10 @@ int main(int argc, char **argv)
 
     /* / is actually ., will get translated in io.c
      * (with the help of sim_root_dir below */
-    const char *paths[] = { "./", NULL };
+    const char *paths[] = { "/", NULL };
     tagcache_init();
     do_tagcache_build(paths);
     tagcache_reverse_scan();
 
     return 0;
 }
-
-/* needed for io.c */
-const char *sim_root_dir = ".";
-
-/* stubs to avoid including thread-sdl.c */
-#include "kernel.h"
-void mutex_init(struct mutex *m)
-{
-    (void)m;
-}   
-
-void mutex_lock(struct mutex *m)
-{
-    (void)m;
-}   
-
-void mutex_unlock(struct mutex *m)
-{
-    (void)m;
-}   
-
-void sim_thread_lock(void *me)
-{
-    (void)me;
-}   
-
-void * sim_thread_unlock(void)
-{
-    return (void*)1;
-}   
-