summaryrefslogtreecommitdiffstats
path: root/macosx/tclMacOSXFCmd.c
blob: d914587a8772ea691a980acf3002d2f823f7db74 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
/*
 * tclMacOSXFCmd.c
 *
 *	This file implements the MacOSX specific portion of file manipulation
 *	subcommands of the "file" command.
 *
 * Copyright (c) 2003-2007 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include <sys/stat.h>
#include "tclInt.h"

#ifdef HAVE_GETATTRLIST
#include <sys/attr.h>
#include <sys/paths.h>
#include <libkern/OSByteOrder.h>
#endif

/* Darwin 8 copyfile API. */
#ifdef HAVE_COPYFILE
#ifdef HAVE_COPYFILE_H
#include <copyfile.h>
#if defined(HAVE_WEAK_IMPORT) && (MAC_OS_X_VERSION_MIN_REQUIRED < 1040)
/* Support for weakly importing copyfile. */
#define WEAK_IMPORT_COPYFILE
extern int		copyfile(const char *from, const char *to,
			    copyfile_state_t state, copyfile_flags_t flags)
			    WEAK_IMPORT_ATTRIBUTE;
#endif /* HAVE_WEAK_IMPORT */
#else /* HAVE_COPYFILE_H */
int			copyfile(const char *from, const char *to,
			    void *state, uint32_t flags);
#define COPYFILE_ACL		(1<<0)
#define COPYFILE_XATTR		(1<<2)
#define COPYFILE_NOFOLLOW_SRC	(1<<18)
#if defined(HAVE_WEAK_IMPORT) && (MAC_OS_X_VERSION_MIN_REQUIRED < 1040)
/* Support for weakly importing copyfile. */
#define WEAK_IMPORT_COPYFILE
extern int		copyfile(const char *from, const char *to,
			    void *state, uint32_t flags)
			    WEAK_IMPORT_ATTRIBUTE;
#endif /* HAVE_WEAK_IMPORT */
#endif /* HAVE_COPYFILE_H */
#endif /* HAVE_COPYFILE */

#ifdef WEAK_IMPORT_COPYFILE
#define MayUseCopyFile()	(copyfile != NULL)
#elif defined(HAVE_COPYFILE)
#define MayUseCopyFile()	(1)
#else
#define MayUseCopyFile()	(0)
#endif

#include <libkern/OSByteOrder.h>

/*
 * Constants for file attributes subcommand. Need to be kept in sync with
 * tclUnixFCmd.c !
 */

enum {
    UNIX_GROUP_ATTRIBUTE,
    UNIX_OWNER_ATTRIBUTE,
    UNIX_PERMISSIONS_ATTRIBUTE,
#ifdef HAVE_CHFLAGS
    UNIX_READONLY_ATTRIBUTE,
#endif
#ifdef MAC_OSX_TCL
    MACOSX_CREATOR_ATTRIBUTE,
    MACOSX_TYPE_ATTRIBUTE,
    MACOSX_HIDDEN_ATTRIBUTE,
    MACOSX_RSRCLENGTH_ATTRIBUTE,
#endif
};

typedef u_int32_t OSType;

static int		GetOSTypeFromObj(Tcl_Interp *interp,
			    Tcl_Obj *objPtr, OSType *osTypePtr);
static Tcl_Obj *	NewOSTypeObj(const OSType newOSType);
static int		SetOSTypeFromAny(Tcl_Interp *interp, Tcl_Obj *objPtr);
static void		UpdateStringOfOSType(Tcl_Obj *objPtr);

static const Tcl_ObjType tclOSTypeType = {
    "osType",				/* name */
    NULL,				/* freeIntRepProc */
    NULL,				/* dupIntRepProc */
    UpdateStringOfOSType,		/* updateStringProc */
    SetOSTypeFromAny			/* setFromAnyProc */
};

enum {
    kIsInvisible = 0x4000,
};

#define kFinfoIsInvisible	(OSSwapHostToBigConstInt16(kIsInvisible))

typedef	struct finderinfo {
    u_int32_t type;
    u_int32_t creator;
    u_int16_t fdFlags;
    u_int32_t location;
    u_int16_t reserved;
    u_int32_t extendedFileInfo[4];
} __attribute__ ((__packed__)) finderinfo;

typedef struct fileinfobuf {
    u_int32_t info_length;
    u_int32_t data[8];
} fileinfobuf;

/*
 *----------------------------------------------------------------------
 *
 * TclMacOSXGetFileAttribute
 *
 *	Gets a MacOSX attribute of a file. Which attribute is controlled by
 *	objIndex. The object will have ref count 0.
 *
 * Results:
 *	Standard TCL result. Returns a new Tcl_Obj in attributePtrPtr if there
 *	is no error.
 *
 * Side effects:
 *	A new object is allocated.
 *
 *----------------------------------------------------------------------
 */

int
TclMacOSXGetFileAttribute(
    Tcl_Interp *interp,		 /* The interp we are using for errors. */
    int objIndex,		 /* The index of the attribute. */
    Tcl_Obj *fileName,		 /* The name of the file (UTF-8). */
    Tcl_Obj **attributePtrPtr)	 /* A pointer to return the object with. */
{
#ifdef HAVE_GETATTRLIST
    int result;
    Tcl_StatBuf statBuf;
    struct attrlist alist;
    fileinfobuf finfo;
    finderinfo *finder = (finderinfo *) &finfo.data;
    off_t *rsrcForkSize = (off_t *) &finfo.data;
    const char *native;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"invalid attribute: %s", Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read attributes of \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    switch (objIndex) {
    case MACOSX_CREATOR_ATTRIBUTE:
	*attributePtrPtr = NewOSTypeObj(
		OSSwapBigToHostInt32(finder->creator));
	break;
    case MACOSX_TYPE_ATTRIBUTE:
	*attributePtrPtr = NewOSTypeObj(
		OSSwapBigToHostInt32(finder->type));
	break;
    case MACOSX_HIDDEN_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewBooleanObj(
		(finder->fdFlags & kFinfoIsInvisible) != 0);
	break;
    case MACOSX_RSRCLENGTH_ATTRIBUTE:
	*attributePtrPtr = Tcl_NewWideIntObj(*rsrcForkSize);
	break;
    }
    return TCL_OK;
#else
    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "Mac OS X file attributes not supported", -1));
    Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
    return TCL_ERROR;
#endif /* HAVE_GETATTRLIST */
}

/*
 *---------------------------------------------------------------------------
 *
 * TclMacOSXSetFileAttribute --
 *
 *	Sets a MacOSX attribute of a file. Which attribute is controlled by
 *	objIndex.
 *
 * Results:
 *	Standard TCL result.
 *
 * Side effects:
 *	As above.
 *
 *---------------------------------------------------------------------------
 */

int
TclMacOSXSetFileAttribute(
    Tcl_Interp *interp,		/* The interp for error reporting. */
    int objIndex,		/* The index of the attribute. */
    Tcl_Obj *fileName,		/* The name of the file (UTF-8). */
    Tcl_Obj *attributePtr)	/* New owner for file. */
{
#ifdef HAVE_GETATTRLIST
    int result;
    Tcl_StatBuf statBuf;
    struct attrlist alist;
    fileinfobuf finfo;
    finderinfo *finder = (finderinfo *) &finfo.data;
    off_t *rsrcForkSize = (off_t *) &finfo.data;
    const char *native;

    result = TclpObjStat(fileName, &statBuf);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (S_ISDIR(statBuf.st_mode) && objIndex != MACOSX_HIDDEN_ATTRIBUTE) {
	/*
	 * Directories only support attribute "-hidden".
	 */

	errno = EISDIR;
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"invalid attribute: %s", Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    if (objIndex == MACOSX_RSRCLENGTH_ATTRIBUTE) {
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
    } else {
	alist.commonattr = ATTR_CMN_FNDRINFO;
    }
    native = Tcl_FSGetNativePath(fileName);
    result = getattrlist(native, &alist, &finfo, sizeof(fileinfobuf), 0);

    if (result != 0) {
	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		"could not read attributes of \"%s\": %s",
		TclGetString(fileName), Tcl_PosixError(interp)));
	return TCL_ERROR;
    }

    if (objIndex != MACOSX_RSRCLENGTH_ATTRIBUTE) {
	OSType t;
	int h;

	switch (objIndex) {
	case MACOSX_CREATOR_ATTRIBUTE:
	    if (GetOSTypeFromObj(interp, attributePtr, &t) != TCL_OK) {
		return TCL_ERROR;
	    }
	    finder->creator = OSSwapHostToBigInt32(t);
	    break;
	case MACOSX_TYPE_ATTRIBUTE:
	    if (GetOSTypeFromObj(interp, attributePtr, &t) != TCL_OK) {
		return TCL_ERROR;
	    }
	    finder->type = OSSwapHostToBigInt32(t);
	    break;
	case MACOSX_HIDDEN_ATTRIBUTE:
	    if (Tcl_GetBooleanFromObj(interp, attributePtr, &h) != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (h) {
		finder->fdFlags |= kFinfoIsInvisible;
	    } else {
		finder->fdFlags &= ~kFinfoIsInvisible;
	    }
	    break;
	}

	result = setattrlist(native, &alist,
		&finfo.data, sizeof(finfo.data), 0);

	if (result != 0) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "could not set attributes of \"%s\": %s",
		    TclGetString(fileName), Tcl_PosixError(interp)));
	    return TCL_ERROR;
	}
    } else {
	Tcl_WideInt newRsrcForkSize;

	if (Tcl_GetWideIntFromObj(interp, attributePtr,
		&newRsrcForkSize) != TCL_OK) {
	    return TCL_ERROR;
	}

	if (newRsrcForkSize != *rsrcForkSize) {
	    Tcl_DString ds;

	    /*
	     * Only setting rsrclength to 0 to strip a file's resource fork is
	     * supported.
	     */

	    if (newRsrcForkSize != 0) {
		Tcl_SetObjResult(interp, Tcl_NewStringObj(
			"setting nonzero rsrclength not supported", -1));
		Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
		return TCL_ERROR;
	    }

	    /*
	     * Construct path to resource fork.
	     */

	    Tcl_DStringInit(&ds);
	    Tcl_DStringAppend(&ds, native, -1);
	    Tcl_DStringAppend(&ds, _PATH_RSRCFORKSPEC, -1);

	    result = truncate(Tcl_DStringValue(&ds), (off_t)0);
	    if (result != 0) {
		/*
		 * truncate() on a valid resource fork path may fail with a
		 * permission error in some OS releases, try truncating with
		 * open() instead:
		 */

		int fd = open(Tcl_DStringValue(&ds), O_WRONLY | O_TRUNC);

		if (fd > 0) {
		    result = close(fd);
		}
	    }

	    Tcl_DStringFree(&ds);

	    if (result != 0) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"could not truncate resource fork of \"%s\": %s",
			TclGetString(fileName), Tcl_PosixError(interp)));
		return TCL_ERROR;
	    }
	}
    }
    return TCL_OK;
#else
    Tcl_SetObjResult(interp, Tcl_NewStringObj(
	    "Mac OS X file attributes not supported", -1));
    Tcl_SetErrorCode(interp, "TCL", "UNSUPPORTED", NULL);
    return TCL_ERROR;
#endif
}

/*
 *---------------------------------------------------------------------------
 *
 * TclMacOSXCopyFileAttributes --
 *
 *	Copy the MacOSX attributes and resource fork (if present) from one
 *	file to another.
 *
 * Results:
 *	Standard Tcl result.
 *
 * Side effects:
 *	MacOSX attributes and resource fork are updated in the new file to
 *	reflect the old file.
 *
 *---------------------------------------------------------------------------
 */

int
TclMacOSXCopyFileAttributes(
    const char *src,		/* Path name of source file (native). */
    const char *dst,		/* Path name of target file (native). */
    const Tcl_StatBuf *statBufPtr)
				/* Stat info for source file */
{
    if (MayUseCopyFile()) {
#ifdef HAVE_COPYFILE
	if (0 == copyfile(src, dst, NULL, (S_ISLNK(statBufPtr->st_mode)
		? COPYFILE_XATTR | COPYFILE_NOFOLLOW_SRC
		: COPYFILE_XATTR | COPYFILE_ACL))) {
	    return TCL_OK;
	}
#endif /* HAVE_COPYFILE */
    } else {
#if (!defined(HAVE_COPYFILE) || defined(WEAK_IMPORT_COPYFILE)) && defined(HAVE_GETATTRLIST)
	struct attrlist alist;
	fileinfobuf finfo;
	off_t *rsrcForkSize = (off_t *) &finfo.data;
	Tcl_DString srcBuf, dstBuf;
	int result;

	bzero(&alist, sizeof(struct attrlist));
	alist.bitmapcount = ATTR_BIT_MAP_COUNT;
	alist.commonattr = ATTR_CMN_FNDRINFO;

	if (getattrlist(src, &alist, &finfo, sizeof(fileinfobuf), 0)) {
	    return TCL_ERROR;
	}
	if (setattrlist(dst, &alist, &finfo.data, sizeof(finfo.data), 0)) {
	    return TCL_ERROR;
	}

	/*
	 * If we're a directory, we're done as they never have resource forks.
	 */

	if (S_ISDIR(statBufPtr->st_mode)) {
	    return TCL_OK;
	}

	/*
	 * We only copy a non-empty resource fork, so determine if that's the
	 * case first.
	 */

	alist.commonattr = 0;
	alist.fileattr = ATTR_FILE_RSRCLENGTH;
	if (getattrlist(src, &alist, &finfo, sizeof(fileinfobuf), 0)) {
	    return TCL_ERROR;
	} else if (*rsrcForkSize == 0) {
	    return TCL_OK;
	}

	/*
	 * Construct paths to resource forks.
	 */

	Tcl_DStringInit(&srcBuf);
	Tcl_DStringAppend(&srcBuf, src, -1);
	Tcl_DStringAppend(&srcBuf, _PATH_RSRCFORKSPEC, -1);
	Tcl_DStringInit(&dstBuf);
	Tcl_DStringAppend(&dstBuf, dst, -1);
	Tcl_DStringAppend(&dstBuf, _PATH_RSRCFORKSPEC, -1);

	/*
	 * Do the copy.
	 */

	result = TclUnixCopyFile(Tcl_DStringValue(&srcBuf),
		Tcl_DStringValue(&dstBuf), statBufPtr, 1);
	Tcl_DStringFree(&srcBuf);
	Tcl_DStringFree(&dstBuf);
	if (result == 0) {
	    return TCL_OK;
	}
#endif /* (!HAVE_COPYFILE || WEAK_IMPORT_COPYFILE) && HAVE_GETATTRLIST */
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * TclMacOSXMatchType --
 *
 *	This routine is used by the globbing code to check if a file matches a
 *	given mac type and/or creator code.
 *
 * Results:
 *	The return value is 1, 0 or -1 indicating whether the file matches the
 *	given criteria, does not match them, or an error occurred (in wich
 *	case an error is left in interp).
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclMacOSXMatchType(
    Tcl_Interp *interp,		/* Interpreter to receive errors. */
    const char *pathName,	/* Native path to check. */
    const char *fileName,	/* Native filename to check. */
    Tcl_StatBuf *statBufPtr,	/* Stat info for file to check */
    Tcl_GlobTypeData *types)	/* Type description to match against. */
{
#ifdef HAVE_GETATTRLIST
    struct attrlist alist;
    fileinfobuf finfo;
    finderinfo *finder = (finderinfo *) &finfo.data;
    OSType osType;

    bzero(&alist, sizeof(struct attrlist));
    alist.bitmapcount = ATTR_BIT_MAP_COUNT;
    alist.commonattr = ATTR_CMN_FNDRINFO;
    if (getattrlist(pathName, &alist, &finfo, sizeof(fileinfobuf), 0) != 0) {
	return 0;
    }
    if ((types->perm & TCL_GLOB_PERM_HIDDEN) &&
	    !((finder->fdFlags & kFinfoIsInvisible) || (*fileName == '.'))) {
	return 0;
    }
    if (S_ISDIR(statBufPtr->st_mode)
	    && (types->macType || types->macCreator)) {
	/*
	 * Directories don't support types or creators.
	 */

	return 0;
    }
    if (types->macType) {
	if (GetOSTypeFromObj(interp, types->macType, &osType) != TCL_OK) {
	    return -1;
	}
	if (osType != OSSwapBigToHostInt32(finder->type)) {
	    return 0;
	}
    }
    if (types->macCreator) {
	if (GetOSTypeFromObj(interp, types->macCreator, &osType) != TCL_OK) {
	    return -1;
	}
	if (osType != OSSwapBigToHostInt32(finder->creator)) {
	    return 0;
	}
    }
#endif
    return 1;
}

/*
 *----------------------------------------------------------------------
 *
 * GetOSTypeFromObj --
 *
 *	Attempt to return an OSType from the Tcl object "objPtr".
 *
 * Results:
 *	Standard TCL result. If an error occurs during conversion, an error
 *	message is left in interp->objResult.
 *
 * Side effects:
 *	The string representation of objPtr will be updated if necessary.
 *
 *----------------------------------------------------------------------
 */

static int
GetOSTypeFromObj(
    Tcl_Interp *interp,		/* Used for error reporting if not NULL. */
    Tcl_Obj *objPtr,		/* The object from which to get an OSType. */
    OSType *osTypePtr)		/* Place to store resulting OSType. */
{
    int result = TCL_OK;

    if (objPtr->typePtr != &tclOSTypeType) {
	result = SetOSTypeFromAny(interp, objPtr);
    }
    *osTypePtr = (OSType) objPtr->internalRep.longValue;
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * NewOSTypeObj --
 *
 *	Create a new OSType object.
 *
 * Results:
 *	The newly created OSType object is returned, it has ref count 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static Tcl_Obj *
NewOSTypeObj(
    const OSType osType)	/* OSType used to initialize the new
				 * object. */
{
    Tcl_Obj *objPtr;

    TclNewObj(objPtr);
    TclInvalidateStringRep(objPtr);
    objPtr->internalRep.longValue = (long) osType;
    objPtr->typePtr = &tclOSTypeType;
    return objPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * SetOSTypeFromAny --
 *
 *	Attempts to force the internal representation for a Tcl object to
 *	tclOSTypeType, specifically.
 *
 * Results:
 *	The return value is a standard object Tcl result. If an error occurs
 *	during conversion, an error message is left in the interpreter's
 *	result unless "interp" is NULL.
 *
 *----------------------------------------------------------------------
 */

static int
SetOSTypeFromAny(
    Tcl_Interp *interp,		/* Tcl interpreter */
    Tcl_Obj *objPtr)		/* Pointer to the object to convert */
{
    const char *string;
    int length, result = TCL_OK;
    Tcl_DString ds;
    Tcl_Encoding encoding = Tcl_GetEncoding(NULL, "macRoman");

    string = Tcl_GetStringFromObj(objPtr, &length);
    Tcl_UtfToExternalDString(encoding, string, length, &ds);

    if (Tcl_DStringLength(&ds) > 4) {
	if (interp) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "expected Macintosh OS type but got \"%s\": ", string));
	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "MAC_OSTYPE", NULL);
	}
	result = TCL_ERROR;
    } else {
	OSType osType;
	char bytes[4] = {'\0','\0','\0','\0'};

	memcpy(bytes, Tcl_DStringValue(&ds), (size_t)Tcl_DStringLength(&ds));
	osType = (OSType) bytes[0] << 24 |
		 (OSType) bytes[1] << 16 |
		 (OSType) bytes[2] <<  8 |
		 (OSType) bytes[3];
	TclFreeIntRep(objPtr);
	objPtr->internalRep.longValue = (long) osType;
	objPtr->typePtr = &tclOSTypeType;
    }
    Tcl_DStringFree(&ds);
    Tcl_FreeEncoding(encoding);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfOSType --
 *
 *	Update the string representation for an OSType object. Note: This
 *	function does not free an existing old string rep so storage will be
 *	lost if this has not already been done.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The object's string is set to a valid string that results from the
 *	OSType-to-string conversion.
 *
 *----------------------------------------------------------------------
 */

static void
UpdateStringOfOSType(
    register Tcl_Obj *objPtr)	/* OSType object whose string rep to
				 * update. */
{
    char string[5];
    OSType osType = (OSType) objPtr->internalRep.longValue;
    Tcl_DString ds;
    Tcl_Encoding encoding = Tcl_GetEncoding(NULL, "macRoman");
    unsigned len;

    string[0] = (char) (osType >> 24);
    string[1] = (char) (osType >> 16);
    string[2] = (char) (osType >>  8);
    string[3] = (char) (osType);
    string[4] = '\0';
    Tcl_ExternalToUtfDString(encoding, string, -1, &ds);
    len = (unsigned) Tcl_DStringLength(&ds) + 1;
    objPtr->bytes = ckalloc(len);
    memcpy(objPtr->bytes, Tcl_DStringValue(&ds), len);
    objPtr->length = Tcl_DStringLength(&ds);
    Tcl_DStringFree(&ds);
    Tcl_FreeEncoding(encoding);
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */