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6a5fa4e0 MG |
1 | /* |
2 | * tclXfilecmds.c | |
3 | * | |
4 | * Extended Tcl pipe, copyfile and fstat commands. | |
5 | *----------------------------------------------------------------------------- | |
6 | * Copyright 1992 Karl Lehenbauer and Mark Diekhans. | |
7 | * | |
8 | * Permission to use, copy, modify, and distribute this software and its | |
9 | * documentation for any purpose and without fee is hereby granted, provided | |
10 | * that the above copyright notice appear in all copies. Karl Lehenbauer and | |
11 | * Mark Diekhans make no representations about the suitability of this | |
12 | * software for any purpose. It is provided "as is" without express or | |
13 | * implied warranty. | |
14 | *----------------------------------------------------------------------------- | |
15 | * $Id: tclXfilecmds.c,v 2.0 1992/10/16 04:50:41 markd Rel $ | |
16 | *----------------------------------------------------------------------------- | |
17 | */ | |
18 | ||
19 | #include "tclxint.h" | |
20 | ||
21 | /* | |
22 | * Prototypes of internal functions. | |
23 | */ | |
24 | static char * | |
25 | GetFileType _ANSI_ARGS_((struct stat *statBufPtr)); | |
26 | ||
27 | static void | |
28 | ReturnStatList _ANSI_ARGS_((Tcl_Interp *interp, | |
29 | OpenFile *filePtr, | |
30 | struct stat *statBufPtr)); | |
31 | ||
32 | static int | |
33 | ReturnStatArray _ANSI_ARGS_((Tcl_Interp *interp, | |
34 | OpenFile *filePtr, | |
35 | struct stat *statBufPtr, | |
36 | char *arrayName)); | |
37 | ||
38 | static int | |
39 | ReturnStatItem _ANSI_ARGS_((Tcl_Interp *interp, | |
40 | OpenFile *filePtr, | |
41 | struct stat *statBufPtr, | |
42 | char *itemName)); | |
43 | ||
44 | static int | |
45 | ParseLockUnlockArgs _ANSI_ARGS_((Tcl_Interp *interp, | |
46 | int argc, | |
47 | char **argv, | |
48 | int argIdx, | |
49 | OpenFile **filePtrPtr, | |
50 | struct flock *lockInfoPtr)); | |
51 | ||
52 | \f | |
53 | /* | |
54 | *----------------------------------------------------------------------------- | |
55 | * | |
56 | * Tcl_PipeCmd -- | |
57 | * Implements the pipe TCL command: | |
58 | * pipe [handle_var_r handle_var_w] | |
59 | * | |
60 | * Results: | |
61 | * Standard TCL result. | |
62 | * | |
63 | * Side effects: | |
64 | * Locates and creates entries in the handles table | |
65 | * | |
66 | *----------------------------------------------------------------------------- | |
67 | */ | |
68 | int | |
69 | Tcl_PipeCmd (clientData, interp, argc, argv) | |
70 | ClientData clientData; | |
71 | Tcl_Interp *interp; | |
72 | int argc; | |
73 | char **argv; | |
74 | { | |
75 | Interp *iPtr = (Interp *) interp; | |
76 | int fileIds [2]; | |
77 | char fHandle [12]; | |
78 | ||
79 | if (!((argc == 1) || (argc == 3))) { | |
80 | Tcl_AppendResult (interp, tclXWrongArgs, argv[0], | |
81 | " [handle_var_r handle_var_w]", (char*) NULL); | |
82 | return TCL_ERROR; | |
83 | } | |
84 | ||
85 | if (pipe (fileIds) < 0) { | |
86 | interp->result = Tcl_UnixError (interp); | |
87 | return TCL_ERROR; | |
88 | } | |
89 | ||
90 | if (Tcl_SetupFileEntry (interp, fileIds [0], TRUE, FALSE) != TCL_OK) | |
91 | goto errorExit; | |
92 | if (Tcl_SetupFileEntry (interp, fileIds [1], FALSE, TRUE) != TCL_OK) | |
93 | goto errorExit; | |
94 | ||
95 | if (argc == 1) | |
96 | sprintf (interp->result, "file%d file%d", fileIds [0], fileIds [1]); | |
97 | else { | |
98 | sprintf (fHandle, "file%d", fileIds [0]); | |
99 | if (Tcl_SetVar (interp, argv[1], fHandle, TCL_LEAVE_ERR_MSG) == NULL) | |
100 | goto errorExit; | |
101 | ||
102 | sprintf (fHandle, "file%d", fileIds [1]); | |
103 | if (Tcl_SetVar (interp, argv[2], fHandle, TCL_LEAVE_ERR_MSG) == NULL) | |
104 | goto errorExit; | |
105 | } | |
106 | ||
107 | return TCL_OK; | |
108 | ||
109 | errorExit: | |
110 | close (fileIds [0]); | |
111 | close (fileIds [1]); | |
112 | return TCL_ERROR; | |
113 | } | |
114 | \f | |
115 | /* | |
116 | *----------------------------------------------------------------------------- | |
117 | * | |
118 | * Tcl_CopyfileCmd -- | |
119 | * Implements the copyfile TCL command: | |
120 | * copyfile handle1 handle2 [lines] | |
121 | * | |
122 | * Results: | |
123 | * Nothing if it worked, else an error. | |
124 | * | |
125 | *----------------------------------------------------------------------------- | |
126 | */ | |
127 | int | |
128 | Tcl_CopyfileCmd (clientData, interp, argc, argv) | |
129 | ClientData clientData; | |
130 | Tcl_Interp *interp; | |
131 | int argc; | |
132 | char **argv; | |
133 | { | |
134 | OpenFile *fromFilePtr, *toFilePtr; | |
135 | char transferBuffer [2048]; | |
136 | int bytesRead; | |
137 | ||
138 | if (argc != 3) { | |
139 | Tcl_AppendResult (interp, tclXWrongArgs, argv [0], | |
140 | " fromfilehandle tofilehandle", (char *) NULL); | |
141 | return TCL_ERROR; | |
142 | } | |
143 | ||
144 | if (TclGetOpenFile (interp, argv[1], &fromFilePtr) != TCL_OK) | |
145 | return TCL_ERROR; | |
146 | if (TclGetOpenFile (interp, argv[2], &toFilePtr) != TCL_OK) | |
147 | return TCL_ERROR; | |
148 | ||
149 | if (!fromFilePtr->readable) { | |
150 | interp->result = "Source file is not open for read access"; | |
151 | return TCL_ERROR; | |
152 | } | |
153 | if (!toFilePtr->writable) { | |
154 | interp->result = "Target file is not open for write access"; | |
155 | return TCL_ERROR; | |
156 | } | |
157 | ||
158 | while (TRUE) { | |
159 | bytesRead = fread (transferBuffer, sizeof (char), | |
160 | sizeof (transferBuffer), fromFilePtr->f); | |
161 | if (bytesRead <= 0) { | |
162 | if (feof (fromFilePtr->f)) | |
163 | break; | |
164 | else | |
165 | goto unixError; | |
166 | } | |
167 | if (fwrite (transferBuffer, sizeof (char), bytesRead, toFilePtr->f) != | |
168 | bytesRead) | |
169 | goto unixError; | |
170 | } | |
171 | ||
172 | return TCL_OK; | |
173 | ||
174 | unixError: | |
175 | interp->result = Tcl_UnixError (interp); | |
176 | return TCL_ERROR; | |
177 | } | |
178 | \f | |
179 | /* | |
180 | *----------------------------------------------------------------------------- | |
181 | * | |
182 | * GetFileType -- | |
183 | * | |
184 | * Looks at stat mode and returns a text string indicating what type of | |
185 | * file it is. | |
186 | * | |
187 | * Parameters: | |
188 | * o statBufPtr (I) - Pointer to a buffer initialized by stat or fstat. | |
189 | * Returns: | |
190 | * A pointer static text string representing the type of the file. | |
191 | *----------------------------------------------------------------------------- | |
192 | */ | |
193 | static char * | |
194 | GetFileType (statBufPtr) | |
195 | struct stat *statBufPtr; | |
196 | { | |
197 | char *typeStr; | |
198 | ||
199 | /* | |
200 | * Get a string representing the type of the file. | |
201 | */ | |
202 | if (S_ISREG (statBufPtr->st_mode)) { | |
203 | typeStr = "file"; | |
204 | } else if (S_ISDIR (statBufPtr->st_mode)) { | |
205 | typeStr = "directory"; | |
206 | } else if (S_ISCHR (statBufPtr->st_mode)) { | |
207 | typeStr = "characterSpecial"; | |
208 | } else if (S_ISBLK (statBufPtr->st_mode)) { | |
209 | typeStr = "blockSpecial"; | |
210 | } else if (S_ISFIFO (statBufPtr->st_mode)) { | |
211 | typeStr = "fifo"; | |
212 | } else if (S_ISLNK (statBufPtr->st_mode)) { | |
213 | typeStr = "link"; | |
214 | } else if (S_ISSOCK (statBufPtr->st_mode)) { | |
215 | typeStr = "socket"; | |
216 | } else { | |
217 | typeStr = "unknown"; | |
218 | } | |
219 | ||
220 | return typeStr; | |
221 | } | |
222 | \f | |
223 | /* | |
224 | *----------------------------------------------------------------------------- | |
225 | * | |
226 | * ReturnStatList -- | |
227 | * | |
228 | * Return file stat infomation as a keyed list. | |
229 | * | |
230 | * Parameters: | |
231 | * o interp (I) - The list is returned in result. | |
232 | * o filePtr (I) - Pointer to the Tcl open file structure. | |
233 | * o statBufPtr (I) - Pointer to a buffer initialized by stat or fstat. | |
234 | *----------------------------------------------------------------------------- | |
235 | */ | |
236 | static void | |
237 | ReturnStatList (interp, filePtr, statBufPtr) | |
238 | Tcl_Interp *interp; | |
239 | OpenFile *filePtr; | |
240 | struct stat *statBufPtr; | |
241 | { | |
242 | char statList [200]; | |
243 | ||
244 | sprintf (statList, | |
245 | "{atime %d} {ctime %d} {dev %d} {gid %d} {ino %d} {mode %d} ", | |
246 | statBufPtr->st_atime, statBufPtr->st_ctime, statBufPtr->st_dev, | |
247 | statBufPtr->st_gid, statBufPtr->st_ino, statBufPtr->st_mode); | |
248 | Tcl_AppendResult (interp, statList, (char *) NULL); | |
249 | ||
250 | sprintf (statList, | |
251 | "{mtime %d} {nlink %d} {size %d} {uid %d} {tty %d} {type %s}", | |
252 | statBufPtr->st_mtime, statBufPtr->st_nlink, statBufPtr->st_size, | |
253 | statBufPtr->st_uid, isatty (fileno (filePtr->f)), | |
254 | GetFileType (statBufPtr)); | |
255 | Tcl_AppendResult (interp, statList, (char *) NULL); | |
256 | ||
257 | } | |
258 | \f | |
259 | /* | |
260 | *----------------------------------------------------------------------------- | |
261 | * | |
262 | * ReturnStatArray -- | |
263 | * | |
264 | * Return file stat infomation in an array. | |
265 | * | |
266 | * Parameters: | |
267 | * o interp (I) - Current interpreter, error return in result. | |
268 | * o filePtr (I) - Pointer to the Tcl open file structure. | |
269 | * o statBufPtr (I) - Pointer to a buffer initialized by stat or fstat. | |
270 | * o arrayName (I) - The name of the array to return the info in. | |
271 | * Returns: | |
272 | * TCL_OK or TCL_ERROR. | |
273 | *----------------------------------------------------------------------------- | |
274 | */ | |
275 | static int | |
276 | ReturnStatArray (interp, filePtr, statBufPtr, arrayName) | |
277 | Tcl_Interp *interp; | |
278 | OpenFile *filePtr; | |
279 | struct stat *statBufPtr; | |
280 | char *arrayName; | |
281 | { | |
282 | char numBuf [30]; | |
283 | ||
284 | sprintf (numBuf, "%d", statBufPtr->st_dev); | |
285 | if (Tcl_SetVar2 (interp, arrayName, "dev", numBuf, | |
286 | TCL_LEAVE_ERR_MSG) == NULL) | |
287 | return TCL_ERROR; | |
288 | ||
289 | sprintf (numBuf, "%d", statBufPtr->st_ino); | |
290 | if (Tcl_SetVar2 (interp, arrayName, "ino", numBuf, | |
291 | TCL_LEAVE_ERR_MSG) == NULL) | |
292 | return TCL_ERROR; | |
293 | ||
294 | sprintf (numBuf, "%d", statBufPtr->st_mode); | |
295 | if (Tcl_SetVar2 (interp, arrayName, "mode", numBuf, | |
296 | TCL_LEAVE_ERR_MSG) == NULL) | |
297 | return TCL_ERROR; | |
298 | ||
299 | sprintf (numBuf, "%d", statBufPtr->st_nlink); | |
300 | if (Tcl_SetVar2 (interp, arrayName, "nlink", numBuf, | |
301 | TCL_LEAVE_ERR_MSG) == NULL) | |
302 | return TCL_ERROR; | |
303 | ||
304 | sprintf (numBuf, "%d", statBufPtr->st_uid); | |
305 | if (Tcl_SetVar2 (interp, arrayName, "uid", numBuf, | |
306 | TCL_LEAVE_ERR_MSG) == NULL) | |
307 | return TCL_ERROR; | |
308 | ||
309 | sprintf (numBuf, "%d", statBufPtr->st_gid); | |
310 | if (Tcl_SetVar2 (interp, arrayName, "gid", numBuf, | |
311 | TCL_LEAVE_ERR_MSG) == NULL) | |
312 | return TCL_ERROR; | |
313 | ||
314 | sprintf (numBuf, "%d", statBufPtr->st_size); | |
315 | if (Tcl_SetVar2 (interp, arrayName, "size", numBuf, | |
316 | TCL_LEAVE_ERR_MSG) == NULL) | |
317 | return TCL_ERROR; | |
318 | ||
319 | sprintf (numBuf, "%d", statBufPtr->st_atime); | |
320 | if (Tcl_SetVar2 (interp, arrayName, "atime", numBuf, | |
321 | TCL_LEAVE_ERR_MSG) == NULL) | |
322 | return TCL_ERROR; | |
323 | ||
324 | sprintf (numBuf, "%d", statBufPtr->st_mtime); | |
325 | if (Tcl_SetVar2 (interp, arrayName, "mtime", numBuf, | |
326 | TCL_LEAVE_ERR_MSG) == NULL) | |
327 | return TCL_ERROR; | |
328 | ||
329 | sprintf (numBuf, "%d", statBufPtr->st_ctime); | |
330 | if (Tcl_SetVar2 (interp, arrayName, "ctime", numBuf, | |
331 | TCL_LEAVE_ERR_MSG) == NULL) | |
332 | return TCL_ERROR; | |
333 | ||
334 | if (Tcl_SetVar2 (interp, arrayName, "tty", | |
335 | isatty (fileno (filePtr->f)) ? "1" : "0", | |
336 | TCL_LEAVE_ERR_MSG) == NULL) | |
337 | return TCL_ERROR; | |
338 | ||
339 | if (Tcl_SetVar2 (interp, arrayName, "type", GetFileType (statBufPtr), | |
340 | TCL_LEAVE_ERR_MSG) == NULL) | |
341 | return TCL_ERROR; | |
342 | ||
343 | return TCL_OK; | |
344 | ||
345 | } | |
346 | \f | |
347 | /* | |
348 | *----------------------------------------------------------------------------- | |
349 | * | |
350 | * ReturnStatItem -- | |
351 | * | |
352 | * Return a single file status item. | |
353 | * | |
354 | * Parameters: | |
355 | * o interp (I) - Item or error returned in result. | |
356 | * o filePtr (I) - Pointer to the Tcl open file structure. | |
357 | * o statBufPtr (I) - Pointer to a buffer initialized by stat or fstat. | |
358 | * o itemName (I) - The name of the desired item. | |
359 | * Returns: | |
360 | * TCL_OK or TCL_ERROR. | |
361 | *----------------------------------------------------------------------------- | |
362 | */ | |
363 | static int | |
364 | ReturnStatItem (interp, filePtr, statBufPtr, itemName) | |
365 | Tcl_Interp *interp; | |
366 | OpenFile *filePtr; | |
367 | struct stat *statBufPtr; | |
368 | char *itemName; | |
369 | { | |
370 | if (STREQU (itemName, "dev")) | |
371 | sprintf (interp->result, "%d", statBufPtr->st_dev); | |
372 | else if (STREQU (itemName, "ino")) | |
373 | sprintf (interp->result, "%d", statBufPtr->st_ino); | |
374 | else if (STREQU (itemName, "mode")) | |
375 | sprintf (interp->result, "%d", statBufPtr->st_mode); | |
376 | else if (STREQU (itemName, "nlink")) | |
377 | sprintf (interp->result, "%d", statBufPtr->st_nlink); | |
378 | else if (STREQU (itemName, "uid")) | |
379 | sprintf (interp->result, "%d", statBufPtr->st_uid); | |
380 | else if (STREQU (itemName, "gid")) | |
381 | sprintf (interp->result, "%d", statBufPtr->st_gid); | |
382 | else if (STREQU (itemName, "size")) | |
383 | sprintf (interp->result, "%d", statBufPtr->st_size); | |
384 | else if (STREQU (itemName, "atime")) | |
385 | sprintf (interp->result, "%d", statBufPtr->st_atime); | |
386 | else if (STREQU (itemName, "mtime")) | |
387 | sprintf (interp->result, "%d", statBufPtr->st_mtime); | |
388 | else if (STREQU (itemName, "ctime")) | |
389 | sprintf (interp->result, "%d", statBufPtr->st_ctime); | |
390 | else if (STREQU (itemName, "type")) | |
391 | interp->result = GetFileType (statBufPtr); | |
392 | else if (STREQU (itemName, "tty")) | |
393 | interp->result = isatty (fileno (filePtr->f)) ? "1" : "0"; | |
394 | else { | |
395 | Tcl_AppendResult (interp, "Got \"", itemName, "\", expected one of ", | |
396 | "\"atime\", \"ctime\", \"dev\", \"gid\", \"ino\", ", | |
397 | "\"mode\", \"mtime\", \"nlink\", \"size\", ", | |
398 | "\"tty\", \"type\", \"uid\"", (char *) NULL); | |
399 | ||
400 | return TCL_ERROR; | |
401 | } | |
402 | ||
403 | return TCL_OK; | |
404 | ||
405 | } | |
406 | \f | |
407 | /* | |
408 | *----------------------------------------------------------------------------- | |
409 | * | |
410 | * Tcl_FstatCmd -- | |
411 | * Implements the fstat TCL command: | |
412 | * fstat handle [item]|[stat arrayvar] | |
413 | * | |
414 | *----------------------------------------------------------------------------- | |
415 | */ | |
416 | int | |
417 | Tcl_FstatCmd (clientData, interp, argc, argv) | |
418 | ClientData clientData; | |
419 | Tcl_Interp *interp; | |
420 | int argc; | |
421 | char **argv; | |
422 | { | |
423 | OpenFile *filePtr; | |
424 | struct stat statBuf; | |
425 | ||
426 | if ((argc < 2) || (argc > 4)) { | |
427 | Tcl_AppendResult (interp, tclXWrongArgs, argv [0], | |
428 | " handle [item]|[stat arrayVar]", (char *) NULL); | |
429 | return TCL_ERROR; | |
430 | } | |
431 | ||
432 | if (TclGetOpenFile (interp, argv[1], &filePtr) != TCL_OK) | |
433 | return TCL_ERROR; | |
434 | ||
435 | if (fstat (fileno (filePtr->f), &statBuf)) { | |
436 | interp->result = Tcl_UnixError (interp); | |
437 | return TCL_ERROR; | |
438 | } | |
439 | ||
440 | /* | |
441 | * Return data in the requested format. | |
442 | */ | |
443 | if (argc == 4) { | |
444 | if (!STREQU (argv [2], "stat")) { | |
445 | Tcl_AppendResult (interp, "expected item name of \"stat\" when ", | |
446 | "using array name", (char *) NULL); | |
447 | return TCL_ERROR; | |
448 | } | |
449 | return ReturnStatArray (interp, filePtr, &statBuf, argv [3]); | |
450 | } | |
451 | if (argc == 3) | |
452 | return ReturnStatItem (interp, filePtr, &statBuf, argv [2]); | |
453 | ||
454 | ReturnStatList (interp, filePtr, &statBuf); | |
455 | return TCL_OK; | |
456 | ||
457 | } | |
458 | \f | |
459 | /* | |
460 | *----------------------------------------------------------------------------- | |
461 | * | |
462 | * Tcl_LgetsCmd -- | |
463 | * | |
464 | * Implements the `lgets' Tcl command: | |
465 | * lgets fileId [varName] | |
466 | * | |
467 | * Results: | |
468 | * A standard Tcl result. | |
469 | * | |
470 | * Side effects: | |
471 | * See the user documentation. | |
472 | * | |
473 | *----------------------------------------------------------------------------- | |
474 | */ | |
475 | int | |
476 | Tcl_LgetsCmd (notUsed, interp, argc, argv) | |
477 | ClientData notUsed; | |
478 | Tcl_Interp *interp; | |
479 | int argc; | |
480 | char **argv; | |
481 | { | |
482 | dynamicBuf_t dynBuf; | |
483 | char prevChar; | |
484 | int bracesDepth, inQuotes, inChar; | |
485 | OpenFile *filePtr; | |
486 | ||
487 | if ((argc != 2) && (argc != 3)) { | |
488 | Tcl_AppendResult (interp, tclXWrongArgs, argv[0], | |
489 | " fileId [varName]", (char *) NULL); | |
490 | return TCL_ERROR; | |
491 | } | |
492 | if (TclGetOpenFile(interp, argv[1], &filePtr) != TCL_OK) { | |
493 | return TCL_ERROR; | |
494 | } | |
495 | if (!filePtr->readable) { | |
496 | Tcl_AppendResult (interp, "\"", argv[1], | |
497 | "\" wasn't opened for reading", (char *) NULL); | |
498 | return TCL_ERROR; | |
499 | } | |
500 | ||
501 | Tcl_DynBufInit (&dynBuf); | |
502 | ||
503 | prevChar = '\0'; | |
504 | bracesDepth = 0; | |
505 | inQuotes = FALSE; | |
506 | ||
507 | /* | |
508 | * Read in characters, keeping trace of if we are in the middle of a {} | |
509 | * or "" part of the list. | |
510 | */ | |
511 | ||
512 | while (TRUE) { | |
513 | if (dynBuf.len + 1 == dynBuf.size) | |
514 | Tcl_ExpandDynBuf (&dynBuf, 0); | |
515 | inChar = getc (filePtr->f); | |
516 | if (inChar == EOF) { | |
517 | if (ferror (filePtr->f)) | |
518 | goto readError; | |
519 | break; | |
520 | } | |
521 | if (prevChar != '\\') { | |
522 | switch (inChar) { | |
523 | case '{': | |
524 | bracesDepth++; | |
525 | break; | |
526 | case '}': | |
527 | if (bracesDepth == 0) | |
528 | break; | |
529 | bracesDepth--; | |
530 | break; | |
531 | case '"': | |
532 | if (bracesDepth == 0) | |
533 | inQuotes = !inQuotes; | |
534 | break; | |
535 | } | |
536 | } | |
537 | prevChar = inChar; | |
538 | if ((inChar == '\n') && (bracesDepth == 0) && !inQuotes) | |
539 | break; | |
540 | dynBuf.ptr [dynBuf.len++] = inChar; | |
541 | } | |
542 | ||
543 | dynBuf.ptr [dynBuf.len] = '\0'; | |
544 | ||
545 | if ((bracesDepth != 0) || inQuotes) { | |
546 | Tcl_AppendResult (interp, "miss-matched ", | |
547 | (bracesDepth != 0) ? "braces" : "quote", | |
548 | " in inputed list: ", dynBuf.ptr, (char *) NULL); | |
549 | goto errorExit; | |
550 | } | |
551 | ||
552 | if (argc == 2) { | |
553 | Tcl_DynBufReturn (interp, &dynBuf); | |
554 | } else { | |
555 | if (Tcl_SetVar (interp, argv[2], dynBuf.ptr, | |
556 | TCL_LEAVE_ERR_MSG) == NULL) | |
557 | goto errorExit; | |
558 | if (feof (filePtr->f) && (dynBuf.len == 0)) | |
559 | interp->result = "-1"; | |
560 | else | |
561 | sprintf (interp->result, "%d", dynBuf.len); | |
562 | Tcl_DynBufFree (&dynBuf); | |
563 | } | |
564 | return TCL_OK; | |
565 | ||
566 | readError: | |
567 | Tcl_ResetResult (interp); | |
568 | interp->result = Tcl_UnixError (interp); | |
569 | clearerr (filePtr->f); | |
570 | goto errorExit; | |
571 | ||
572 | errorExit: | |
573 | Tcl_DynBufFree (&dynBuf); | |
574 | return TCL_ERROR; | |
575 | ||
576 | } | |
577 | ||
578 | #ifndef TCL_NO_FILE_LOCKING | |
579 | \f | |
580 | /* | |
581 | *----------------------------------------------------------------------------- | |
582 | * | |
583 | * ParseLockUnlockArgs -- | |
584 | * | |
585 | * Parse the positional arguments common to both the flock and funlock | |
586 | * commands: | |
587 | * ... handle [start] [length] [origin] | |
588 | * | |
589 | * Parameters: | |
590 | * o interp (I) - Pointer to the interpreter, errors returned in result. | |
591 | * o argc (I) - Count of arguments supplied to the comment. | |
592 | * o argv (I) - Commant argument vector. | |
593 | * o argIdx (I) - Index of the first common agument to parse. | |
594 | * o filePtrPtr (O) - Pointer to the open file structure returned here. | |
595 | * o lockInfoPtr (O) - Fcntl info structure, start, length and whence | |
596 | * are initialized by this routine. | |
597 | * Returns: | |
598 | * TCL_OK if all is OK, TCL_ERROR and an error message is result. | |
599 | * | |
600 | *----------------------------------------------------------------------------- | |
601 | */ | |
602 | static int | |
603 | ParseLockUnlockArgs (interp, argc, argv, argIdx, filePtrPtr, lockInfoPtr) | |
604 | Tcl_Interp *interp; | |
605 | int argc; | |
606 | char **argv; | |
607 | int argIdx; | |
608 | OpenFile **filePtrPtr; | |
609 | struct flock *lockInfoPtr; | |
610 | { | |
611 | ||
612 | lockInfoPtr->l_start = 0; | |
613 | lockInfoPtr->l_len = 0; | |
614 | lockInfoPtr->l_whence = 0; | |
615 | ||
616 | if (TclGetOpenFile (interp, argv [argIdx], filePtrPtr) != TCL_OK) | |
617 | return TCL_ERROR; | |
618 | argIdx++; | |
619 | ||
620 | if ((argIdx < argc) && (argv [argIdx][0] != '\0')) { | |
621 | if (Tcl_GetLong (interp, argv [argIdx], | |
622 | &lockInfoPtr->l_start) != TCL_OK) | |
623 | return TCL_ERROR; | |
624 | } | |
625 | argIdx++; | |
626 | ||
627 | if ((argIdx < argc) && (argv [argIdx][0] != '\0')) { | |
628 | if (Tcl_GetLong (interp, argv [argIdx], &lockInfoPtr->l_len) != TCL_OK) | |
629 | return TCL_ERROR; | |
630 | } | |
631 | argIdx++; | |
632 | ||
633 | if (argIdx < argc) { | |
634 | if (STREQU (argv [argIdx], "start")) | |
635 | lockInfoPtr->l_whence = 0; | |
636 | else if (STREQU (argv [argIdx], "current")) | |
637 | lockInfoPtr->l_whence = 1; | |
638 | else if (STREQU (argv [argIdx], "end")) | |
639 | lockInfoPtr->l_whence = 2; | |
640 | else | |
641 | goto badOrgin; | |
642 | } | |
643 | ||
644 | return TCL_OK; | |
645 | ||
646 | badOrgin: | |
647 | Tcl_AppendResult(interp, "bad origin \"", argv [argIdx], | |
648 | "\": should be \"start\", \"current\", or \"end\"", | |
649 | (char *) NULL); | |
650 | return TCL_ERROR; | |
651 | ||
652 | } | |
653 | \f | |
654 | /* | |
655 | *----------------------------------------------------------------------------- | |
656 | * | |
657 | * Tcl_FlockCmd -- | |
658 | * | |
659 | * Implements the `flock' Tcl command: | |
660 | * flock [-read|-write] [-nowait] handle [start] [length] [origin] | |
661 | * | |
662 | * Results: | |
663 | * A standard Tcl result. | |
664 | * | |
665 | *----------------------------------------------------------------------------- | |
666 | */ | |
667 | int | |
668 | Tcl_FlockCmd (notUsed, interp, argc, argv) | |
669 | ClientData notUsed; | |
670 | Tcl_Interp *interp; | |
671 | int argc; | |
672 | char **argv; | |
673 | { | |
674 | int argIdx, stat; | |
675 | int readLock = FALSE, writeLock = FALSE, noWaitLock = FALSE; | |
676 | OpenFile *filePtr; | |
677 | struct flock lockInfo; | |
678 | ||
679 | if (argc < 2) | |
680 | goto invalidArgs; | |
681 | ||
682 | /* | |
683 | * Parse off the options. | |
684 | */ | |
685 | ||
686 | for (argIdx = 1; (argIdx < argc) && (argv [argIdx][0] == '-'); argIdx++) { | |
687 | if (STREQU (argv [argIdx], "-read")) { | |
688 | readLock = TRUE; | |
689 | continue; | |
690 | } | |
691 | if (STREQU (argv [argIdx], "-write")) { | |
692 | writeLock = TRUE; | |
693 | continue; | |
694 | } | |
695 | if (STREQU (argv [argIdx], "-nowait")) { | |
696 | noWaitLock = TRUE; | |
697 | continue; | |
698 | } | |
699 | goto invalidOption; | |
700 | } | |
701 | ||
702 | if (readLock && writeLock) | |
703 | goto bothReadAndWrite; | |
704 | if (!(readLock || writeLock)) | |
705 | writeLock = TRUE; | |
706 | ||
707 | /* | |
708 | * Make sure there are enough arguments left and then parse the | |
709 | * positional ones. | |
710 | */ | |
711 | if ((argIdx > argc - 1) || (argIdx < argc - 4)) | |
712 | goto invalidArgs; | |
713 | ||
714 | if (ParseLockUnlockArgs (interp, argc, argv, argIdx, &filePtr, | |
715 | &lockInfo) != TCL_OK) | |
716 | return TCL_ERROR; | |
717 | ||
718 | if (readLock && !filePtr->readable) | |
719 | goto notReadable; | |
720 | if (writeLock && !filePtr->writable) | |
721 | goto notWritable; | |
722 | ||
723 | lockInfo.l_type = writeLock ? F_WRLCK : F_RDLCK; | |
724 | ||
725 | stat = fcntl (fileno (filePtr->f), noWaitLock ? F_SETLK : F_SETLKW, | |
726 | &lockInfo); | |
727 | if ((stat < 0) && (errno != EACCES)) { | |
728 | interp->result = Tcl_UnixError (interp); | |
729 | return TCL_ERROR; | |
730 | } | |
731 | ||
732 | if (noWaitLock) | |
733 | interp->result = (stat < 0) ? "0" : "1"; | |
734 | ||
735 | return TCL_OK; | |
736 | ||
737 | /* | |
738 | * Code to return error messages. | |
739 | */ | |
740 | ||
741 | invalidArgs: | |
742 | Tcl_AppendResult (interp, tclXWrongArgs, argv [0], " [-read|-write] ", | |
743 | "[-nowait] handle [start] [length] [origin]", | |
744 | (char *) NULL); | |
745 | return TCL_ERROR; | |
746 | ||
747 | /* | |
748 | * Invalid option found at argv [argIdx]. | |
749 | */ | |
750 | invalidOption: | |
751 | Tcl_AppendResult (interp, "invalid option \"", argv [argIdx], | |
752 | "\" expected one of \"-read\", \"-write\", or ", | |
753 | "\"-nowait\"", (char *) NULL); | |
754 | return TCL_ERROR; | |
755 | ||
756 | bothReadAndWrite: | |
757 | interp->result = "can not specify both \"-read\" and \"-write\""; | |
758 | return TCL_ERROR; | |
759 | ||
760 | notReadable: | |
761 | interp->result = "file not open for reading"; | |
762 | return TCL_ERROR; | |
763 | ||
764 | notWritable: | |
765 | interp->result = "file not open for writing"; | |
766 | return TCL_ERROR; | |
767 | } | |
768 | \f | |
769 | /* | |
770 | *----------------------------------------------------------------------------- | |
771 | * | |
772 | * Tcl_FunlockCmd -- | |
773 | * | |
774 | * Implements the `funlock' Tcl command: | |
775 | * funlock handle [start] [length] [origin] | |
776 | * | |
777 | * Results: | |
778 | * A standard Tcl result. | |
779 | * | |
780 | *----------------------------------------------------------------------------- | |
781 | */ | |
782 | int | |
783 | Tcl_FunlockCmd (notUsed, interp, argc, argv) | |
784 | ClientData notUsed; | |
785 | Tcl_Interp *interp; | |
786 | int argc; | |
787 | char **argv; | |
788 | { | |
789 | OpenFile *filePtr; | |
790 | struct flock lockInfo; | |
791 | ||
792 | if ((argc < 2) || (argc > 5)) | |
793 | goto invalidArgs; | |
794 | ||
795 | if (ParseLockUnlockArgs (interp, argc, argv, 1, &filePtr, | |
796 | &lockInfo) != TCL_OK) | |
797 | return TCL_ERROR; | |
798 | ||
799 | lockInfo.l_type = F_UNLCK; | |
800 | ||
801 | if (fcntl (fileno(filePtr->f), F_SETLK, &lockInfo) < 0) { | |
802 | interp->result = Tcl_UnixError (interp); | |
803 | return TCL_ERROR; | |
804 | } | |
805 | ||
806 | return TCL_OK; | |
807 | ||
808 | invalidArgs: | |
809 | Tcl_AppendResult (interp, tclXWrongArgs, argv [0], | |
810 | " handle [start] [length] [origin]", (char *) NULL); | |
811 | return TCL_ERROR; | |
812 | ||
813 | } | |
814 | #else | |
815 | \f | |
816 | /* | |
817 | *----------------------------------------------------------------------------- | |
818 | * | |
819 | * Tcl_FlockCmd -- | |
820 | * | |
821 | * Version of the command that always returns an error on systems that | |
822 | * don't have file locking. | |
823 | * | |
824 | *----------------------------------------------------------------------------- | |
825 | */ | |
826 | int | |
827 | Tcl_FlockCmd (notUsed, interp, argc, argv) | |
828 | ClientData notUsed; | |
829 | Tcl_Interp *interp; | |
830 | int argc; | |
831 | char **argv; | |
832 | { | |
833 | interp->result = "File locking is not available on this system"; | |
834 | return TCL_ERROR; | |
835 | } | |
836 | \f | |
837 | /* | |
838 | *----------------------------------------------------------------------------- | |
839 | * | |
840 | * Tcl_FunlockCmd -- | |
841 | * | |
842 | * Version of the command that always returns an error on systems that | |
843 | * don't have file locking/ | |
844 | * | |
845 | *----------------------------------------------------------------------------- | |
846 | */ | |
847 | int | |
848 | Tcl_FunlockCmd (notUsed, interp, argc, argv) | |
849 | ClientData notUsed; | |
850 | Tcl_Interp *interp; | |
851 | int argc; | |
852 | char **argv; | |
853 | { | |
854 | return Tcl_FlockCmd (notUsed, interp, argc, argv); | |
855 | } | |
856 | #endif |