[syslinux] ldlinux: CurrentDir not set if syslinux.cfg is missing

[Sebastian Herbszt]

> If a syslinux floppy does not contain a config file (syslinux.cfg) modules are
> not being found unless specified with a directory prefix (e.g. /pcitest.c32).
> The reason is that CurrentDir is only set if there is a config file present. This is a
> possible regression since commit 68eefb79e2cbb590ebf958dd0c50ce00b941abd2.
> Before this change RootDir was used in searchdir and now it's CurrentDir unless
> the filename starts with '/'. Possible fix is to set CurrentDir to RootDir if no config
> file is found.

Actually it seems better to move this to the top of the "check for config file" block.
Initialize CurrentDir to RootDir and change it if a config file is found.

- Sebastian

--- core/ldlinux.asm.orig 2008-06-17 19:25:35.000000000 +0200
+++ core/ldlinux.asm 2008-06-18 12:10:45.000000000 +0200
@@ -901,6 +901,8 @@
   mov di,ConfigName
   call strcpy
 
+  mov eax,[RootDir] ; Make the root directory ...
+  mov [CurrentDir],eax ; ... the current directory
   mov di,syslinux_cfg1
   call open
   jnz .config_open