errno.c

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/*
 * COPYRIGHT:   See COPYING in the top level directory
 * PROJECT:     ReactOS system libraries
 * FILE:        lib/sdk/crt/stdlib/errno.c
 * PURPOSE:     Unknown
 * PROGRAMER:   Unknown
 *
 */
#include <precomp.h>
#include "doserrmap.h"
#include <errno.h>
#include <internal/wine/msvcrt.h>
 
/*********************************************************************
 *      _errno (MSVCRT.@)
 */
int* CDECL _errno(void)
{
    return &(msvcrt_get_thread_data()->thread_errno);
}
 
/*********************************************************************
 *      __doserrno (MSVCRT.@)
 */
unsigned long* CDECL __doserrno(void)
{
    return &(msvcrt_get_thread_data()->thread_doserrno);
}
 
/*********************************************************************
 *      _get_errno (MSVCRT.@)
 */
errno_t CDECL _get_errno(int *pValue)
{
    if (!pValue)
        return EINVAL;
 
    *pValue = *_errno();
    return 0;
}
 
/*********************************************************************
 *      _get_doserrno (MSVCRT.@)
 */
errno_t CDECL _get_doserrno(unsigned long *pValue)
{
    if (!pValue)
        return EINVAL;
 
    *pValue = *__doserrno();
    return 0;
}
 
/*********************************************************************
 *      _set_errno (MSVCRT.@)
 */
errno_t CDECL _set_errno(int value)
{
    *_errno() = value;
    return 0;
}
 
/*********************************************************************
 *      _set_doserrno (MSVCRT.@)
 */
errno_t CDECL _set_doserrno(unsigned long value)
{
    *__doserrno() = value;
    return 0;
}
 
/*
 * This function sets both doserrno to the passed in OS error code
 * and also maps this to an appropriate errno code.  The mapping
 * has been deduced automagically by running this functions, which
 * exists in MSVCRT but is undocumented, on all the error codes in
 * winerror.h.
 */
void CDECL _dosmaperr(unsigned long oserror)
{
    int pos, base, lim;
 
    _set_doserrno(oserror);
 
    /* Use binary chop to find the corresponding errno code */
    for (base=0, lim=sizeof(doserrmap)/sizeof(doserrmap[0]); lim; lim >>= 1) {
        pos = base+(lim >> 1);
        if (doserrmap[pos].winerr == oserror) {
            _set_errno(doserrmap[pos].en);
            return;
        } else if (doserrmap[pos].winerr < oserror) {
            base = pos + 1;
            --lim;
        }
    }
    /* EINVAL appears to be the default */
    _set_errno(EINVAL);
}
 
/******************************************************************************
*              _set_error_mode (MSVCRT.@)
*
* Set the error mode, which describes where the C run-time writes error
* messages.
*
* PARAMS
*   mode - the new error mode
*
* RETURNS
*   The old error mode.
*
*/
int msvcrt_error_mode = MSVCRT__OUT_TO_DEFAULT;
 
int CDECL _set_error_mode(int mode)
{
    const int old = msvcrt_error_mode;
    if ( MSVCRT__REPORT_ERRMODE != mode ) {
        msvcrt_error_mode = mode;
    }
    return old;
}
 
/******************************************************************************
 *      _seterrormode (MSVCRT.@)
 */
void CDECL _seterrormode(int mode)
{
    SetErrorMode( mode );
}