reactos/lib/crt/stdlib/errno.c

   1 /* $Id$
   2  *
   3  */
   4 #include "precomp.h"
   5 #include <internal/tls.h>
   6
   7 #include "doserrmap.h"
   8
   9 /*
  10  * @implemented
  11  */
  12 int* __doserrno(void)
  13 {
  14   return (int*)(&GetThreadData()->tdoserrno);
  15 }
  16
  17 /*
  18  * @implemented
  19  */
  20 int *_errno(void)
  21 {
  22   return(&GetThreadData()->terrno);
  23 }
  24
  25
  26 int __set_doserrno(int error)
  27 {
  28   PTHREADDATA ThreadData;
  29
  30   ThreadData = GetThreadData();
  31   if (ThreadData)
  32     ThreadData->tdoserrno = error;
  33
  34   return(error);
  35 }
  36
  37 int __set_errno(int error)
  38 {
  39   PTHREADDATA ThreadData;
  40
  41   ThreadData = GetThreadData();
  42   if (ThreadData)
  43     ThreadData->terrno = error;
  44
  45   return(error);
  46 }
  47
  48 /*
  49  * This function sets both doserrno to the passed in OS error code
  50  * and also maps this to an appropriate errno code.  The mapping
  51  * has been deduced automagically by running this functions, which
  52  * exists in MSVCRT but is undocumented, on all the error codes in
  53  * winerror.h.
  54  */
  55 void _dosmaperr(unsigned long oserror)
  56 {
  57         int pos, base, lim;
  58
  59         __set_doserrno(oserror);
  60
  61         /* Use binary chop to find the corresponding errno code */
  62         for (base=0, lim=sizeof(doserrmap)/sizeof(doserrmap[0]); lim; lim >>= 1) {
  63                 pos = base+(lim >> 1);
  64                 if (doserrmap[pos].winerr == oserror) {
  65                         __set_errno(doserrmap[pos].en);
  66                         return;
  67                 } else if (doserrmap[pos].winerr < oserror) {
  68                         base = pos + 1;
  69                         --lim;
  70                 }
  71         }
  72         /* EINVAL appears to be the default */
  73         __set_errno(EINVAL);
  74 }
  75
  76 /* EOF */