reactos/base/shell/cmd/shift.c

/*
 *  SHIFT.C - shift internal batch command
 *
 *
 *  History:
 *
 *    16 Jul 1998 (Hans B Pufal)
 *        started.
 *
 *    16 Jul 1998 (John P Price)
 *        Separated commands into individual files.
 *
 *    27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
 *        added config.h include
 *
 *    07-Jan-1999 (Eric Kohl)
 *        Added help text ("shift /?") and cleaned up.
 *
 *    20-Jan-1999 (Eric Kohl)
 *        Unicode and redirection safe!
 *
 *    30-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
 *        Remove all hardcoded strings in En.rc
 */

#include "precomp.h"

/*
 *  Perform the SHIFT command.
 *
 * Only valid inside batch files.
 *
 * FREEDOS extension : optional parameter DOWN to allow shifting
 *   parameters backwards.
 *
 */

INT cmd_shift (LPTSTR param)
{
    INT i = 0;
    TRACE ("cmd_shift: (\'%s\')\n", debugstr_aw(param));

    if (!_tcsncmp (param, _T("/?"), 2))
    {
        ConOutResPaging(TRUE,STRING_SHIFT_HELP);
        return 0;
    }

    nErrorLevel = 0;

    if (bc == NULL)
    {
        /* not in batch - error!! */
        nErrorLevel = 1;
        return 1;
    }

    if (!_tcsicmp (param, _T("down")))
    {
        if (bc->shiftlevel[0])
            for (; i <= 9; i++)
                bc->shiftlevel[i]--;
    }
    else /* shift up */
    {
        if (*param == _T('/'))
        {
            if (param[1] < '0' || param[1] > '9')
            {
                error_invalid_switch(param[1]);
                return 1;
            }
            i = param[1] - '0';
        }

        for (; i < 9; i++)
            bc->shiftlevel[i] = bc->shiftlevel[i + 1];
        bc->shiftlevel[i]++;
    }

    return 0;
}

/* EOF */