Don't let very long directory names overrun the stack.

Fix some related minor problems involving "//", vfork.
* callproc.c (encode_current_directory): New function.
(call_process): Don't append "/"; not needed.
* fileio.c (file_name_as_directory_slop): New constant.
(file_name_as_directory): Allow SRC to be longer than SRCLEN;
this can save the caller having to alloca.
(Ffile_name_as_directory, Fdirectory_file_name, Fexpand_file_name):
Use SAFE_ALLOCA, not alloca.
(directory_file_name, Fexpand_file_name): Leave leading "//"
alone, since it can be special even on POSIX platforms.
* callproc.c (call_process):
* process.c (Fformat_network_address):
* sysdep.c (sys_subshell):
Use encode_current_directory rather than rolling our own.
(create_process): No need to encode directory; caller does that now.
* process.h (encode_current_directory): New decl.
* sysdep.c (sys_subshell): Work even if vfork trashes saved_handlers.
Rework to avoid 'goto xyzzy;'.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/process.h b/src/process.h
index b312f7f2425..6aff95686a2 100644
--- a/src/process.h
+++ b/src/process.h
@@ -218,6 +218,7 @@ enum
 
 extern void block_child_signal (void);
 extern void unblock_child_signal (void);
+extern Lisp_Object encode_current_directory (void);
 extern void record_kill_process (struct Lisp_Process *, Lisp_Object);
 
 /* Defined in sysdep.c.  */