ReactOS  0.4.15-dev-1039-gb9754fa
batch.c
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1 /*
2  * BATCH.C - batch file processor for CMD.EXE.
3  *
4  *
5  * History:
6  *
7  * ??/??/?? (Evan Jeffrey)
8  * started.
9  *
10  * 15 Jul 1995 (Tim Norman)
11  * modes and bugfixes.
12  *
13  * 08 Aug 1995 (Matt Rains)
14  * i have cleaned up the source code. changes now bring this
15  * source into guidelines for recommended programming practice.
16  *
17  * i have added some constants to help making changes easier.
18  *
19  * 29 Jan 1996 (Steffan Kaiser)
20  * made a few cosmetic changes
21  *
22  * 05 Feb 1996 (Tim Norman)
23  * changed to comply with new first/rest calling scheme
24  *
25  * 14 Jun 1997 (Steffen Kaiser)
26  * bug fixes. added error level expansion %?. ctrl-break handling
27  *
28  * 16 Jul 1998 (Hans B Pufal)
29  * Totally reorganised in conjunction with COMMAND.C (cf) to
30  * implement proper BATCH file nesting and other improvements.
31  *
32  * 16 Jul 1998 (John P Price <linux-guru@gcfl.net>)
33  * Separated commands into individual files.
34  *
35  * 19 Jul 1998 (Hans B Pufal) [HBP_001]
36  * Preserve state of echo flag across batch calls.
37  *
38  * 19 Jul 1998 (Hans B Pufal) [HBP_002]
39  * Implementation of FOR command
40  *
41  * 20-Jul-1998 (John P Price <linux-guru@gcfl.net>)
42  * added error checking after cmd_alloc calls
43  *
44  * 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
45  * added config.h include
46  *
47  * 02-Aug-1998 (Hans B Pufal) [HBP_003]
48  * Fixed bug in ECHO flag restoration at exit from batch file
49  *
50  * 26-Jan-1999 Eric Kohl
51  * Replaced CRT io functions by Win32 io functions.
52  * Unicode safe!
53  *
54  * 23-Feb-2001 (Carl Nettelblad <cnettel@hem.passagen.es>)
55  * Fixes made to get "for" working.
56  *
57  * 02-Apr-2005 (Magnus Olsen <magnus@greatlord.com>)
58  * Remove all hardcoded strings in En.rc
59  */
60 
61 #include "precomp.h"
62 
63 /* The stack of current batch contexts.
64  * NULL when no batch is active.
65  */
68 
69 #ifdef MSCMD_BATCH_ECHO
71 #endif
72 
73 BOOL bEcho = TRUE; /* The echo flag */
74 
75 /* Buffer for reading Batch file lines */
77 
78 
79 /*
80  * Returns a pointer to the n'th parameter of the current batch file.
81  * If no such parameter exists returns pointer to empty string.
82  * If no batch file is current, returns NULL.
83  */
84 BOOL
86  IN TCHAR Char,
87  OUT PCTSTR* ArgPtr,
88  OUT BOOL* IsParam0)
89 {
90  PCTSTR pp;
91  INT n = Char - _T('0');
92 
93  TRACE("FindArg: (%d)\n", n);
94 
95  *ArgPtr = NULL;
96 
97  if (n < 0 || n > 9)
98  return FALSE;
99 
100  n = bc->shiftlevel[n];
101  *IsParam0 = (n == 0);
102  pp = bc->params;
103 
104  /* Step up the strings till we reach
105  * the end or the one we want. */
106  while (*pp && n--)
107  pp += _tcslen(pp) + 1;
108 
109  *ArgPtr = pp;
110  return TRUE;
111 }
112 
113 
114 /*
115  * Batch_params builds a parameter list in newly allocated memory.
116  * The parameters consist of null terminated strings with a final
117  * NULL character signalling the end of the parameters.
118  *
119  */
121 {
122  LPTSTR dp = (LPTSTR)cmd_alloc((_tcslen(s1) + _tcslen(s2) + 3) * sizeof (TCHAR));
123 
124  /* JPP 20-Jul-1998 added error checking */
125  if (dp == NULL)
126  {
127  WARN("Cannot allocate memory for dp!\n");
129  return NULL;
130  }
131 
132  if (s1 && *s1)
133  {
134  s1 = _stpcpy (dp, s1);
135  *s1++ = _T('\0');
136  }
137  else
138  s1 = dp;
139 
140  while (*s2)
141  {
142  BOOL inquotes = FALSE;
143 
144  /* Find next parameter */
145  while (_istspace(*s2) || (*s2 && _tcschr(STANDARD_SEPS, *s2)))
146  s2++;
147  if (!*s2)
148  break;
149 
150  /* Copy it */
151  do
152  {
153  if (!inquotes && (_istspace(*s2) || _tcschr(STANDARD_SEPS, *s2)))
154  break;
155  inquotes ^= (*s2 == _T('"'));
156  *s1++ = *s2++;
157  } while (*s2);
158  *s1++ = _T('\0');
159  }
160 
161  *s1 = _T('\0');
162 
163  return dp;
164 }
165 
166 /*
167  * Free the allocated memory of a batch file.
168  */
170 {
171  TRACE("ClearBatch mem = %08x ; free = %d\n", bc->mem, bc->memfree);
172 
173  if (bc->mem && bc->memfree)
174  cmd_free(bc->mem);
175 
176  if (bc->raw_params)
178 
179  if (bc->params)
180  cmd_free(bc->params);
181 }
182 
183 /*
184  * If a batch file is current, exits it, freeing the context block and
185  * chaining back to the previous one.
186  *
187  * If no new batch context is found, sets ECHO back ON.
188  *
189  * If the parameter is non-null or not empty, it is printed as an exit
190  * message
191  */
192 
194 {
195  ClearBatch();
196 
197  TRACE("ExitBatch\n");
198 
201 
202 #ifndef MSCMD_BATCH_ECHO
203  /* Preserve echo state across batch calls */
204  bEcho = bc->bEcho;
205 #endif
206 
207  while (bc->setlocal)
208  cmd_endlocal(_T(""));
209 
210  bc = bc->prev;
211 
212 #if 0
213  /* Do not process any more parts of a compound command */
214  bc->current = NULL;
215 #endif
216 
217  /* If there is no more batch contexts, notify the signal handler */
218  if (!bc)
219  {
221  BatType = NONE;
222 
223 #ifdef MSCMD_BATCH_ECHO
224  bEcho = bBcEcho;
225 #endif
226  }
227 }
228 
229 /*
230  * Exit all the nested batch calls.
231  */
233 {
234  while (bc)
235  ExitBatch();
236 }
237 
238 /*
239  * Load batch file into memory.
240  */
241 static void BatchFile2Mem(HANDLE hBatchFile)
242 {
243  TRACE("BatchFile2Mem()\n");
244 
245  bc->memsize = GetFileSize(hBatchFile, NULL);
246  bc->mem = (char *)cmd_alloc(bc->memsize+1); /* 1 extra for '\0' */
247 
248  /* if memory is available, read it in and close the file */
249  if (bc->mem != NULL)
250  {
251  TRACE ("BatchFile2Mem memory %08x - %08x\n",bc->mem,bc->memsize);
252  SetFilePointer (hBatchFile, 0, NULL, FILE_BEGIN);
253  ReadFile(hBatchFile, (LPVOID)bc->mem, bc->memsize, &bc->memsize, NULL);
254  bc->mem[bc->memsize]='\0'; /* end this, so you can dump it as a string */
255  bc->memfree=TRUE; /* this one needs to be freed */
256  }
257  else
258  {
259  bc->memsize=0; /* this will prevent mem being accessed */
260  bc->memfree=FALSE;
261  }
262  bc->mempos = 0; /* set position to the start */
263 }
264 
265 /*
266  * Start batch file execution.
267  *
268  * The firstword parameter is the full filename of the batch file.
269  */
271 {
272  INT ret = 0;
273  INT i;
274  HANDLE hFile = NULL;
275  BOOLEAN bSameFn = FALSE;
276  BOOLEAN bTopLevel;
277  BATCH_CONTEXT new;
278  PFOR_CONTEXT saved_fc;
279 
280  SetLastError(0);
281  if (bc && bc->mem)
282  {
283  TCHAR fpname[MAX_PATH];
284  GetFullPathName(fullname, ARRAYSIZE(fpname), fpname, NULL);
285  if (_tcsicmp(bc->BatchFilePath, fpname) == 0)
286  bSameFn = TRUE;
287  }
288  TRACE("Batch(\'%s\', \'%s\', \'%s\') bSameFn = %d\n",
289  debugstr_aw(fullname), debugstr_aw(firstword), debugstr_aw(param), bSameFn);
290 
291  if (!bSameFn)
292  {
296 
298  {
300  return 1;
301  }
302  }
303 
304  /*
305  * Remember whether this is a top-level batch context, i.e. if there is
306  * no batch context existing prior (bc == NULL originally), and we are
307  * going to create one below.
308  */
309  bTopLevel = !bc;
310 
311  if (bc != NULL && Cmd == bc->current)
312  {
313  /* Then we are transferring to another batch */
314  ClearBatch();
315  AddBatchRedirection(&Cmd->Redirections);
316  }
317  else
318  {
319  struct _SETLOCAL *setlocal = NULL;
320 
321  if (Cmd == NULL)
322  {
323  /* This is a CALL. CALL will set errorlevel to our return value, so
324  * in order to keep the value of errorlevel unchanged in the case
325  * of calling an empty batch file, we must return that same value. */
326  ret = nErrorLevel;
327  }
328  else if (bc)
329  {
330  /* If a batch file runs another batch file as part of a compound command
331  * (e.g. "x.bat & somethingelse") then the first file gets terminated. */
332 
333  /* Get its SETLOCAL stack so it can be migrated to the new context */
334  setlocal = bc->setlocal;
335  bc->setlocal = NULL;
336  ExitBatch();
337  }
338 
339  /* Create a new context. This function will not
340  * return until this context has been exited */
341  new.prev = bc;
342  /* copy some fields in the new structure if it is the same file */
343  if (bSameFn)
344  {
345  new.mem = bc->mem;
346  new.memsize = bc->memsize;
347  new.mempos = 0;
348  new.memfree = FALSE; /* don't free this, being used before this */
349  }
350  bc = &new;
351  bc->RedirList = NULL;
352  bc->setlocal = setlocal;
353  }
354 
356 
357  /* If a new batch file, load it into memory and close the file */
358  if (!bSameFn)
359  {
362  }
363 
364  bc->mempos = 0; /* Go to the beginning of the batch file */
365 #ifndef MSCMD_BATCH_ECHO
366  bc->bEcho = bEcho; /* Preserve echo across batch calls */
367 #endif
368  for (i = 0; i < 10; i++)
369  bc->shiftlevel[i] = i;
370 
371  /* Parse the parameters and make a raw copy of them without modifications */
372  bc->params = BatchParams(firstword, param);
374  if (bc->raw_params == NULL)
375  {
377  return 1;
378  }
379 
380  /* If we are calling from inside a FOR, hide the FOR variables */
381  saved_fc = fc;
382  fc = NULL;
383 
384  /* Perform top-level batch initialization */
385  if (bTopLevel)
386  {
387  /* Default the top-level batch context type to .BAT */
388  BatType = BAT_TYPE;
389 
390  /* If this is a .CMD file, adjust the type */
391  TCHAR *dot = _tcsrchr(bc->BatchFilePath, _T('.'));
392  if (dot && (!_tcsicmp(dot, _T(".cmd"))))
393  {
394  BatType = CMD_TYPE;
395  }
396 
397 #ifdef MSCMD_BATCH_ECHO
398  bBcEcho = bEcho;
399 #endif
400  }
401 
402  /* Check if this is a "CALL :label" */
403  if (*firstword == _T(':'))
404  ret = cmd_goto(firstword);
405 
406  /* If we have created a new context, don't return
407  * until this batch file has completed. */
408  while (bc == &new && !bExit)
409  {
410  Cmd = ParseCommand(NULL);
411  if (!Cmd)
412  {
413  if (!bParseError)
414  continue;
415 
416  /* Echo the pre-parsed batch file line on error */
417  if (bEcho && !bDisableBatchEcho)
418  {
419  if (!bIgnoreEcho)
420  ConOutChar(_T('\n'));
421  PrintPrompt();
423  ConOutChar(_T('\n'));
424  }
425  /* Stop all execution */
426  ExitAllBatches();
427  ret = 1;
428  break;
429  }
430 
431  /* JPP 19980807 */
432  /* Echo the command and execute it */
433  bc->current = Cmd;
435  FreeCommand(Cmd);
436  }
437 
438  /* Perform top-level batch cleanup */
439  if (!bc || bTopLevel)
440  {
441  /* Reset the top-level batch context type */
442  BatType = NONE;
443 
444 #ifdef MSCMD_BATCH_ECHO
445  bEcho = bBcEcho;
446 #endif
447  }
448 
449  /* Restore the FOR variables */
450  fc = saved_fc;
451 
452  /* Always return the last command's return code */
453  TRACE("Batch: returns %d\n", ret);
454  return ret;
455 }
456 
458 {
460 
461  /* Prepend the list to the batch context's list */
462  ListEnd = RedirList;
463  while (*ListEnd)
464  ListEnd = &(*ListEnd)->Next;
465  *ListEnd = bc->RedirList;
466  bc->RedirList = *RedirList;
467 
468  /* Null out the pointer so that the list will not be cleared prematurely.
469  * These redirections should persist until the batch file exits. */
470  *RedirList = NULL;
471 }
472 
473 /*
474  * Read a single line from the batch file from the current batch/memory position.
475  * Almost a copy of FileGetString with same UNICODE handling
476  */
478 {
479  LPSTR lpString;
480  INT len = 0;
481 #ifdef _UNICODE
482  lpString = cmd_alloc(nBufferLength);
483  if (!lpString)
484  {
485  WARN("Cannot allocate memory for lpString\n");
487  return FALSE;
488  }
489 #else
490  lpString = lpBuffer;
491 #endif
492  /* read all chars from memory until a '\n' is encountered */
493  if (bc->mem)
494  {
495  for (; (bc->mempos < bc->memsize && len < (nBufferLength-1)); len++)
496  {
497  lpString[len] = bc->mem[bc->mempos++];
498  if (lpString[len] == '\n' )
499  {
500  len++;
501  break;
502  }
503  }
504  }
505 
506  if (!len)
507  {
508 #ifdef _UNICODE
509  cmd_free(lpString);
510 #endif
511  return FALSE;
512  }
513 
514  lpString[len++] = '\0';
515 #ifdef _UNICODE
516  MultiByteToWideChar(OutputCodePage, 0, lpString, -1, lpBuffer, len);
517  cmd_free(lpString);
518 #endif
519  return TRUE;
520 }
521 
522 /*
523  * Read and return the next executable line form the current batch file
524  *
525  * If no batch file is current or no further executable lines are found
526  * return NULL.
527  *
528  * Set eflag to 0 if line is not to be echoed else 1
529  */
531 {
532  TRACE("ReadBatchLine()\n");
533 
534  /* User halt */
536  {
537  ExitAllBatches();
538  return NULL;
539  }
540 
542  {
543  TRACE("ReadBatchLine(): Reached EOF!\n");
544  /* End of file */
545  ExitBatch();
546  return NULL;
547  }
548 
549  TRACE("ReadBatchLine(): textline: \'%s\'\n", debugstr_aw(textline));
550 
551  if (textline[_tcslen(textline) - 1] != _T('\n'))
552  _tcscat(textline, _T("\n"));
553 
554  return textline;
555 }
556 
557 /* EOF */
INT nErrorLevel
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