winsup/cygwin/local_includes/tls_pbuf.h

   1 /* tls_pbuf.h
   2
   3 This software is a copyrighted work licensed under the terms of the
   4 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   5 details. */
   6
   7 #pragma once
   8
   9 class tmp_pathbuf
  10 {
  11   uint32_t c_buf_old;
  12   uint32_t w_buf_old;
  13 public:
  14   tmp_pathbuf () __attribute__ ((always_inline))
  15   : c_buf_old (_my_tls.locals.pathbufs.c_cnt),
  16     w_buf_old (_my_tls.locals.pathbufs.w_cnt)
  17   {}
  18   ~tmp_pathbuf () __attribute__ ((always_inline))
  19   {
  20     _my_tls.locals.pathbufs.c_cnt = c_buf_old;
  21     _my_tls.locals.pathbufs.w_cnt = w_buf_old;
  22   }
  23
  24   inline bool check_usage (uint32_t c_need, uint32_t w_need)
  25     {
  26       return c_need + c_buf_old < TP_NUM_C_BUFS
  27              && w_need + w_buf_old < TP_NUM_W_BUFS;
  28     }
  29   char *c_get ();  /* Create temporary TLS path buf of size NT_MAX_PATH. */
  30   PWCHAR w_get (); /* Create temporary TLS path buf of size 2 * NT_MAX_PATH. */
  31   inline char *t_get () { return (char *) w_get (); }
  32   inline PUNICODE_STRING u_get (PUNICODE_STRING up)
  33     {
  34       up->Length = 0;
  35       up->MaximumLength = (NT_MAX_PATH - 1) * sizeof (WCHAR);
  36       up->Buffer = w_get ();
  37       return up;
  38     }
  39 };