/* Copyright (c) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
   Use is subject to license terms.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

/*
  Convert Windows API error (GetLastError() to Posix equivalent (errno)
  The exported function  my_osmaperr() is modelled after and borrows
  heavily from undocumented _dosmaperr()(found of the static Microsoft C runtime).
*/

#include <my_global.h>
#include <my_sys.h>


struct errentry 
{
  unsigned long oscode;   /* OS return value */
  int sysv_errno;  /* System V error code */
};

static struct errentry errtable[]= {
  {  ERROR_INVALID_FUNCTION,       EINVAL    },  /* 1 */
  {  ERROR_FILE_NOT_FOUND,         ENOENT    },  /* 2 */
  {  ERROR_PATH_NOT_FOUND,         ENOENT    },  /* 3 */
  {  ERROR_TOO_MANY_OPEN_FILES,    EMFILE    },  /* 4 */
  {  ERROR_ACCESS_DENIED,          EACCES    },  /* 5 */
  {  ERROR_INVALID_HANDLE,         EBADF     },  /* 6 */
  {  ERROR_ARENA_TRASHED,          ENOMEM    },  /* 7 */
  {  ERROR_NOT_ENOUGH_MEMORY,      ENOMEM    },  /* 8 */
  {  ERROR_INVALID_BLOCK,          ENOMEM    },  /* 9 */
  {  ERROR_BAD_ENVIRONMENT,        E2BIG     },  /* 10 */
  {  ERROR_BAD_FORMAT,             ENOEXEC   },  /* 11 */
  {  ERROR_INVALID_ACCESS,         EINVAL    },  /* 12 */
  {  ERROR_INVALID_DATA,           EINVAL    },  /* 13 */
  {  ERROR_INVALID_DRIVE,          ENOENT    },  /* 15 */
  {  ERROR_CURRENT_DIRECTORY,      EACCES    },  /* 16 */
  {  ERROR_NOT_SAME_DEVICE,        EXDEV     },  /* 17 */
  {  ERROR_NO_MORE_FILES,          ENOENT    },  /* 18 */
  {  ERROR_LOCK_VIOLATION,         EACCES    },  /* 33 */
  {  ERROR_BAD_NETPATH,            ENOENT    },  /* 53 */
  {  ERROR_NETWORK_ACCESS_DENIED,  EACCES    },  /* 65 */
  {  ERROR_BAD_NET_NAME,           ENOENT    },  /* 67 */
  {  ERROR_FILE_EXISTS,            EEXIST    },  /* 80 */
  {  ERROR_CANNOT_MAKE,            EACCES    },  /* 82 */
  {  ERROR_FAIL_I24,               EACCES    },  /* 83 */
  {  ERROR_INVALID_PARAMETER,      EINVAL    },  /* 87 */
  {  ERROR_NO_PROC_SLOTS,          EAGAIN    },  /* 89 */
  {  ERROR_DRIVE_LOCKED,           EACCES    },  /* 108 */
  {  ERROR_BROKEN_PIPE,            EPIPE     },  /* 109 */
  {  ERROR_DISK_FULL,              ENOSPC    },  /* 112 */
  {  ERROR_INVALID_TARGET_HANDLE,  EBADF     },  /* 114 */
  {  ERROR_INVALID_NAME,           ENOENT    },  /* 123 */
  {  ERROR_INVALID_HANDLE,         EINVAL    },  /* 124 */
  {  ERROR_WAIT_NO_CHILDREN,       ECHILD    },  /* 128 */
  {  ERROR_CHILD_NOT_COMPLETE,     ECHILD    },  /* 129 */
  {  ERROR_DIRECT_ACCESS_HANDLE,   EBADF     },  /* 130 */
  {  ERROR_NEGATIVE_SEEK,          EINVAL    },  /* 131 */
  {  ERROR_SEEK_ON_DEVICE,         EACCES    },  /* 132 */
  {  ERROR_DIR_NOT_EMPTY,          ENOTEMPTY },  /* 145 */
  {  ERROR_NOT_LOCKED,             EACCES    },  /* 158 */
  {  ERROR_BAD_PATHNAME,           ENOENT    },  /* 161 */
  {  ERROR_MAX_THRDS_REACHED,      EAGAIN    },  /* 164 */
  {  ERROR_LOCK_FAILED,            EACCES    },  /* 167 */
  {  ERROR_ALREADY_EXISTS,         EEXIST    },  /* 183 */
  {  ERROR_FILENAME_EXCED_RANGE,   ENOENT    },  /* 206 */
  {  ERROR_NESTING_NOT_ALLOWED,    EAGAIN    },  /* 215 */
  {  ERROR_NOT_ENOUGH_QUOTA,       ENOMEM    }    /* 1816 */
};

/* size of the table */
#define ERRTABLESIZE (sizeof(errtable)/sizeof(errtable[0]))

/* The following two constants must be the minimum and maximum
values in the (contiguous) range of Exec Failure errors. */
#define MIN_EXEC_ERROR ERROR_INVALID_STARTING_CODESEG
#define MAX_EXEC_ERROR ERROR_INFLOOP_IN_RELOC_CHAIN

/* These are the low and high value in the range of errors that are
access violations */
#define MIN_EACCES_RANGE ERROR_WRITE_PROTECT
#define MAX_EACCES_RANGE ERROR_SHARING_BUFFER_EXCEEDED


static int get_errno_from_oserr(unsigned long oserrno)
{
  int i;

  /* check the table for the OS error code */
  for (i= 0; i < ERRTABLESIZE; ++i) 
  {
    if (oserrno == errtable[i].oscode) 
    {
      return  errtable[i].sysv_errno;
    }
  }

  /* The error code wasn't in the table.  We check for a range of */
  /* EACCES errors or exec failure errors (ENOEXEC).  Otherwise   */
  /* EINVAL is returned.                                          */

  if (oserrno >= MIN_EACCES_RANGE && oserrno <= MAX_EACCES_RANGE)
    return EACCES;
  else if (oserrno >= MIN_EXEC_ERROR && oserrno <= MAX_EXEC_ERROR)
    return ENOEXEC;
  else
    return EINVAL;
}

/* Set errno corresponsing to GetLastError() value */
void my_osmaperr( unsigned long oserrno)
{
  /*
    set thr_winerr so that we could return the Windows Error Code
    when it is EINVAL.
  */
  mysys_thread_var()->thr_winerr= oserrno;
  errno= get_errno_from_oserr(oserrno);
}
