subsys/system/cmd/redir.c

   1 /*
   2  *  REDIR.C - redirection handling.
   3  *
   4  *
   5  *  History:
   6  *
   7  *    12/15/95 (Tim Norman)
   8  *        started.
   9  *
  10  *    12 Jul 98 (Hans B Pufal)
  11  *        Rewrote to make more efficient and to conform to new command.c
  12  *        and batch.c processing.
  13  *
  14  *    27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
  15  *        Added config.h include
  16  *
  17  *    22-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
  18  *        Unicode safe!
  19  *        Added new error redirection "2>" and "2>>".
  20  *
  21  *    26-Jan-1999 (Eric Kohl <ekohl@abo.rhein-zeitung.de>)
  22  *        Added new error AND output redirection "&>" and "&>>".
  23  */
  24
  25 #include "config.h"
  26
  27 #ifdef FEATURE_REDIRECTION
  28
  29 #include <windows.h>
  30 #include <tchar.h>
  31 #include <string.h>
  32 #include <ctype.h>
  33
  34 #include "cmd.h"
  35
  36
  37 static BOOL
  38 IsRedirection (TCHAR c)
  39 {
  40         return (c == _T('<')) || (c == _T('>')) || (c == _T('|'));
  41 }
  42
  43
  44 /*
  45  * Gets the redirection info from the command line and copies the
  46  * file names into ifn, ofn and efn removing them from the command
  47  * line.
  48  *
  49  * Converts remaining command line into a series of null terminated
  50  * strings defined by the pipe char '|'. Each string corresponds
  51  * to a single executable command. A double null terminates the
  52  * command strings.
  53  *
  54  * Return number of command strings found.
  55  *
  56  */
  57
  58 INT GetRedirection (LPTSTR s, LPTSTR ifn, LPTSTR ofn, LPTSTR efn, LPINT lpnFlags)
  59 {
  60         INT num = 1;
  61         LPTSTR dp = s;
  62         LPTSTR sp = s;
  63
  64         /* find and remove all the redirections first */
  65         while (*sp)
  66         {
  67                 if ((*sp == _T('"')) || (*sp == _T('\'')))
  68                 {
  69                         /* No redirects inside quotes */
  70                         TCHAR qc = *sp;
  71
  72                         do
  73                                 *dp++ = *sp++;
  74                         while (*sp && *sp != qc);
  75
  76                         *dp++ = *sp++;
  77                 }
  78                 else if ((*sp == _T('<')) || (*sp == _T('>')) ||
  79                                  (*sp == _T('2')) || (*sp == _T('&')))
  80                 {
  81                         /* MS-DOS ignores multiple redirection symbols and uses the last */
  82                         /* redirection, so we'll emulate that and not check */
  83
  84                         if (*sp == _T('<'))
  85                         {
  86                                 /* input redirection */
  87                                 *lpnFlags |= INPUT_REDIRECTION;
  88                                 do sp++;
  89                                 while( _istspace (*sp) );
  90
  91                                 /* copy file name */
  92                                 while (*sp && !IsRedirection (*sp) && !_istspace (*sp))
  93                                         *ifn++ = *sp++;
  94                                 *ifn = _T('\0');
  95                         }
  96                         else if (*sp == _T('>'))
  97                         {
  98                                 /* output redirection */
  99                                 *lpnFlags |= OUTPUT_REDIRECTION;
 100                                 sp++;
 101
 102                                 /* append request ? */
 103                                 if (*sp == _T('>'))
 104                                 {
 105                                         *lpnFlags |= OUTPUT_APPEND;
 106                                         sp++;
 107                                 }
 108
 109                                 while (_istspace (*sp))
 110                                         sp++;
 111
 112                                 /* copy file name */
 113                                 while (*sp && !IsRedirection (*sp) && !_istspace (*sp))
 114                                         *ofn++ = *sp++;
 115                                 *ofn = _T('\0');
 116                         }
 117                         else if (*sp == _T('2'))
 118                         {
 119                                 /* error redirection */
 120                                 sp++;
 121
 122                                 if (*sp == _T('>'))
 123                                 {
 124                                         *lpnFlags |= ERROR_REDIRECTION;
 125                                         sp++;
 126
 127                                         /* append request ? */
 128                                         if (*sp == _T('>'))
 129                                         {
 130                                                 *lpnFlags |= ERROR_APPEND;
 131                                                 sp++;
 132                                         }
 133                                 }
 134                                 else
 135                                 {
 136                                         /* no redirection!! copy the '2' character! */
 137                                         sp--;
 138                                         *dp++ = *sp++;
 139                                         continue;
 140                                 }
 141
 142                                 while (_istspace (*sp))
 143                                         sp++;
 144
 145                                 /* copy file name */
 146                                 while (*sp && !IsRedirection (*sp) && !_istspace (*sp))
 147                                         *efn++ = *sp++;
 148                                 *efn = _T('\0');
 149                         }
 150                         else if (*sp == _T('&'))
 151                         {
 152                                 /* output AND error redirection */
 153                                 sp++;
 154
 155                                 if (*sp == _T('>'))
 156                                 {
 157                                         *lpnFlags |= (ERROR_REDIRECTION | OUTPUT_REDIRECTION);
 158                                         sp++;
 159
 160                                         /* append request ? */
 161                                         if (*sp == _T('>'))
 162                                         {
 163                                                 *lpnFlags |= (ERROR_APPEND | OUTPUT_APPEND);
 164                                                 sp++;
 165                                         }
 166                                 }
 167                                 else
 168                                 {
 169                                         /* no redirection!! copy the '&' character! */
 170                                         sp--;
 171                                         *dp++ = *sp++;
 172                                         continue;
 173                                 }
 174
 175                                 while (_istspace (*sp))
 176                                         sp++;
 177
 178                                 /* copy file name */
 179                                 while (*sp && !IsRedirection (*sp) && !_istspace (*sp))
 180                                         *ofn++ = *efn++ = *sp++;
 181                                 *ofn = *efn = _T('\0');
 182                         }
 183                 }
 184                 else
 185                         *dp++ = *sp++;
 186         }
 187         *dp++ = _T('\0');
 188         *dp = _T('\0');
 189
 190         /* now go for the pipes */
 191         sp = s;
 192         while (*sp)
 193         {
 194                 if ((*sp == _T('"')) || (*sp == _T('\'')))
 195                 {
 196                         TCHAR qc = *sp;
 197
 198                         do
 199                                 sp++;
 200                         while (*sp && *sp != qc);
 201
 202                         sp++;
 203                 }
 204                 else if (*sp == _T('|'))
 205                 {
 206                         *sp++ = _T('\0');
 207                         num++;
 208                 }
 209                 else
 210                         sp++;
 211         }
 212
 213         return num;
 214 }
 215
 216 #endif /* FEATURE_REDIRECTION */