//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this source code is subject to the terms of the Microsoft shared
// source or premium shared source license agreement under which you licensed
// this source code. If you did not accept the terms of the license agreement,
// you are not authorized to use this source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the SOURCE.RTF on your install media or the root of your tools installation.
// THE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
/***
*dosmap.c - Maps OS errors to errno values
*
*Purpose:
*       _dosmaperr: Maps OS errors to errno values
*
*******************************************************************************/

#include <cruntime.h>
#include <errno.h>
#include <internal.h>

/* This is the error table that defines the mapping between OS error
   codes and errno values */

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

static const 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_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


/***
*void _dosmaperr(oserrno) - Map function number
*
*Purpose:
*       This function takes an OS error number, and maps it to the
*       corresponding errno value (based on UNIX System V values). The
*       OS error number is stored in _doserrno (and the mapped value is
*       stored in errno)
*
*Entry:
*       ULONG oserrno = OS error value
*
*Exit:
*       sets _doserrno and errno.
*
*Exceptions:
*
*******************************************************************************/

int __cdecl _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].errnocode;
        }
    }

    /* 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;
}

