base/shell/cmd/shift.c

   1 /*
   2  *  SHIFT.C - shift internal batch command
   3  *
   4  *
   5  *  History:
   6  *
   7  *    16 Jul 1998 (Hans B Pufal)
   8  *        started.
   9  *
  10  *    16 Jul 1998 (John P Price)
  11  *        Separated commands into individual files.
  12  *
  13  *    27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
  14  *        added config.h include
  15  *
  16  *    07-Jan-1999 (Eric Kohl)
  17  *        Added help text ("shift /?") and cleaned up.
  18  *
  19  *    20-Jan-1999 (Eric Kohl)
  20  *        Unicode and redirection safe!
  21  *
  22  *    30-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
  23  *        Remove all hardcoded strings in En.rc
  24  */
  25
  26 #include "precomp.h"
  27
  28 /*
  29  *  Perform the SHIFT command.
  30  *
  31  * Only valid inside batch files.
  32  *
  33  * FREEDOS extension : optional parameter DOWN to allow shifting
  34  *   parameters backwards.
  35  *
  36  */
  37
  38 INT cmd_shift (LPTSTR param)
  39 {
  40     INT i = 0;
  41     TRACE ("cmd_shift: (\'%s\')\n", debugstr_aw(param));
  42
  43     if (!_tcsncmp (param, _T("/?"), 2))
  44     {
  45         ConOutResPaging(TRUE,STRING_SHIFT_HELP);
  46         return 0;
  47     }
  48
  49     nErrorLevel = 0;
  50
  51     if (bc == NULL)
  52     {
  53         /* not in batch - error!! */
  54         nErrorLevel = 1;
  55         return 1;
  56     }
  57
  58     if (!_tcsicmp (param, _T("down")))
  59     {
  60         if (bc->shiftlevel[0])
  61             for (; i <= 9; i++)
  62                 bc->shiftlevel[i]--;
  63     }
  64     else /* shift up */
  65     {
  66         if (*param == _T('/'))
  67         {
  68             if (param[1] < '0' || param[1] > '9')
  69             {
  70                 error_invalid_switch(param[1]);
  71                 return 1;
  72             }
  73             i = param[1] - '0';
  74         }
  75
  76         for (; i < 9; i++)
  77             bc->shiftlevel[i] = bc->shiftlevel[i + 1];
  78         bc->shiftlevel[i]++;
  79     }
  80
  81     return 0;
  82 }
  83
  84 /* EOF */