bug 498844 - need _wchdir for updater (in shunt) r=dougt

build/wince/shunt/include/mozce_shunt.h

@@ -130,6 +130,7 @@ unsigned int ExpandEnvironmentStringsW(const unsigned short* lpSrc,
 unsigned short * _wgetcwd(unsigned short* dir, unsigned long size);
 unsigned short *_wfullpath( unsigned short *absPath, const unsigned short *relPath, unsigned long maxLength );
 int _unlink(const char *filename );
+int _wchdir(const unsigned short* path);
   
 /* The time stuff should be defined here, but it can't be because it
    is already defined in time.h.

build/wince/shunt/mozce_shunt.def.in

@@ -6,6 +6,7 @@ SetEnvironmentVariableW
 _unlink
 _wfullpath
 _wgetcwd
+_wchdir
 abort
 clock
 errno

build/wince/shunt/shunt.cpp

@@ -115,10 +115,21 @@ int errno = 0;
 
 unsigned short * _wgetcwd(unsigned short * dir, unsigned long size)
 {
+  if (!dir)
+    return 0;
+  unsigned short tmp[MAX_PATH] = {0};
+  GetEnvironmentVariableW(L"CWD", tmp, size);
+  if (tmp && tmp[0]) {
+    if (wcslen(tmp) > size)
+      return 0;
+    wcscpy(dir, tmp);
+    return dir;
+  }
   unsigned long i;
   GetModuleFileName(GetModuleHandle (NULL), dir, MAX_PATH);
   for (i = _tcslen(dir); i && dir[i] != TEXT('\\'); i--) {}
   dir[i + 1] = TCHAR('\0');
+  SetEnvironmentVariableW(L"CWD", dir);
   return dir;
 }
 
@@ -150,6 +161,10 @@ unsigned short *_wfullpath( unsigned short *absPath, const unsigned short *relPa
   return NULL;
 }
 
+int _wchdir(const WCHAR* path) {
+  return SetEnvironmentVariableW(L"CWD", path);
+}
+
 int _unlink(const char *filename)
 {
   unsigned short wname[MAX_PATH];