win32: changes to user ids

Formalise the use of 0 as the uid of a process running with elevated
privileges:

- Rewrite getuid(2) to return DEFAULT_UID by default and 0 if the
  process has elevated privileges.
- geteuid(2) and the corresponding functions for groups are aliases
  for getuid(2).
- Change root's home directory to be whatever GetSystemDirectory()
  returns, probably C:/Windows/System32 in most cases.
- Remove the special handling of geteuid(2) in the line editing code.

With these changes the shell started by 'su' is a lot more like a
*nix root shell.

1 files changed, 0 insertions, 3 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 9e24d410d..95f92aa75 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -45,9 +45,6 @@
 # define _POSIX_VDISABLE '\0'
 #endif
 
-#if ENABLE_PLATFORM_MINGW32
-# define geteuid() (is_admin() ? 0 : DEFAULT_UID)
-#endif
 
 #ifdef TEST
 # define ENABLE_FEATURE_EDITING 0