summaryrefslogtreecommitdiff
path: root/mysys/mf_pack.c
blob: 1b83c6fda1065fc4bb1304322ae66c89f4811a3c (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
/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysys_priv.h"
#include <m_string.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef VMS
#include <rms.h>
#include <iodef.h>
#include <descrip.h>
#endif /* VMS */

static my_string NEAR_F expand_tilde(my_string *path);

	/* Pack a dirname ; Changes HOME to ~/ and current dev to ./ */
	/* from is a dirname (from dirname() ?) ending with FN_LIBCHAR */
	/* to may be == from */

void pack_dirname(my_string to, const char *from)
{
  int cwd_err;
  uint d_length,length,buff_length;
  my_string start;
  char buff[FN_REFLEN];
  DBUG_ENTER("pack_dirname");

  LINT_INIT(buff_length);
  (void) intern_filename(to,from);		/* Change to intern name */

#ifdef FN_DEVCHAR
  if ((start=strrchr(to,FN_DEVCHAR)) != 0)	/* Skip device part */
    start++;
  else
#endif
    start=to;

  if (!(cwd_err= my_getwd(buff,FN_REFLEN,MYF(0))))
  {
    buff_length= (uint) strlen(buff);
    d_length=(uint) (start-to);
    if ((start == to ||
	 (buff_length == d_length && !bcmp(buff,start,d_length))) &&
	*start != FN_LIBCHAR && *start)
    {						/* Put current dir before */
      bchange(to,d_length,buff,buff_length,(uint) strlen(to)+1);
    }
  }

  if ((d_length= cleanup_dirname(to,to)) != 0)
  {
    length=0;
    if (home_dir)
    {
      length= (uint) strlen(home_dir);
      if (home_dir[length-1] == FN_LIBCHAR)
	length--;				/* Don't test last '/' */
    }
    if (length > 1 && length < d_length)
    {						/* test if /xx/yy -> ~/yy */
      if (bcmp(to,home_dir,length) == 0 && to[length] == FN_LIBCHAR)
      {
	to[0]=FN_HOMELIB;			/* Filename begins with ~ */
	(void) strmov_overlapp(to+1,to+length);
      }
    }
    if (! cwd_err)
    {						/* Test if cwd is ~/... */
      if (length > 1 && length < buff_length)
      {
	if (bcmp(buff,home_dir,length) == 0 && buff[length] == FN_LIBCHAR)
	{
	  buff[0]=FN_HOMELIB;
	  (void) strmov_overlapp(buff+1,buff+length);
	}
      }
      if (is_prefix(to,buff))
      {
	length= (uint) strlen(buff);
	if (to[length])
	  (void) strmov_overlapp(to,to+length);	/* Remove everything before */
	else
	{
	  to[0]= FN_CURLIB;			/* Put ./ instead of cwd */
	  to[1]= FN_LIBCHAR;
	  to[2]= '\0';
	}
      }
    }
  }
  DBUG_PRINT("exit",("to: '%s'",to));
  DBUG_VOID_RETURN;
} /* pack_dirname */


/*
  remove unwanted chars from dirname

  SYNOPSIS
     cleanup_dirname()
     to		Store result here
     from	Dirname to fix.  May be same as to

  IMPLEMENTATION
  "/../" removes prev dir
  "/~/" removes all before ~
  //" is same as "/", except on Win32 at start of a file
  "/./" is removed
  Unpacks home_dir if "~/.." used
  Unpacks current dir if if "./.." used

  RETURN
    #  length of new name   
*/

uint cleanup_dirname(register my_string to, const char *from)
{
  reg5 uint length;
  reg2 my_string pos;
  reg3 my_string from_ptr;
  reg4 my_string start;
  char parent[5],				/* for "FN_PARENTDIR" */
       buff[FN_REFLEN+1],*end_parentdir;
#ifdef BACKSLASH_MBTAIL
  CHARSET_INFO *fs= fs_character_set();
#endif
  DBUG_ENTER("cleanup_dirname");
  DBUG_PRINT("enter",("from: '%s'",from));

  start=buff;
  from_ptr=(my_string) from;
#ifdef FN_DEVCHAR
  if ((pos=strrchr(from_ptr,FN_DEVCHAR)) != 0)
  {						/* Skip device part */
    length=(uint) (pos-from_ptr)+1;
    start=strnmov(buff,from_ptr,length); from_ptr+=length;
  }
#endif

  parent[0]=FN_LIBCHAR;
  length=(uint) (strmov(parent+1,FN_PARENTDIR)-parent);
  for (pos=start ; (*pos= *from_ptr++) != 0 ; pos++)
  {
#ifdef BACKSLASH_MBTAIL
    uint l;
    if (use_mb(fs) && (l= my_ismbchar(fs, from_ptr - 1, from_ptr + 2)))
    {
      for (l-- ; l ; *++pos= *from_ptr++, l--);
      start= pos + 1; /* Don't look inside multi-byte char */
      continue;
    }
#endif
    if (*pos == '/')
      *pos = FN_LIBCHAR;
    if (*pos == FN_LIBCHAR)
    {
      if ((uint) (pos-start) > length && bcmp(pos-length,parent,length) == 0)
      {						/* If .../../; skip prev */
	pos-=length;
	if (pos != start)
	{					 /* not /../ */
	  pos--;
	  if (*pos == FN_HOMELIB && (pos == start || pos[-1] == FN_LIBCHAR))
	  {
	    if (!home_dir)
	    {
	      pos+=length+1;			/* Don't unpack ~/.. */
	      continue;
	    }
	    pos=strmov(buff,home_dir)-1;	/* Unpacks ~/.. */
	    if (*pos == FN_LIBCHAR)
	      pos--;				/* home ended with '/' */
	  }
	  if (*pos == FN_CURLIB && (pos == start || pos[-1] == FN_LIBCHAR))
	  {
	    if (my_getwd(curr_dir,FN_REFLEN,MYF(0)))
	    {
	      pos+=length+1;			/* Don't unpack ./.. */
	      continue;
	    }
	    pos=strmov(buff,curr_dir)-1;	/* Unpacks ./.. */
	    if (*pos == FN_LIBCHAR)
	      pos--;				/* home ended with '/' */
	  }
	  end_parentdir=pos;
	  while (pos >= start && *pos != FN_LIBCHAR)	/* remove prev dir */
	    pos--;
	  if (pos[1] == FN_HOMELIB || bcmp(pos,parent,length) == 0)
	  {					/* Don't remove ~user/ */
	    pos=strmov(end_parentdir+1,parent);
	    *pos=FN_LIBCHAR;
	    continue;
	  }
	}
      }
      else if ((uint) (pos-start) == length-1 &&
	       !bcmp(start,parent+1,length-1))
	start=pos;				/* Starts with "../" */
      else if (pos-start > 0 && pos[-1] == FN_LIBCHAR)
      {
#ifdef FN_NETWORK_DRIVES
	if (pos-start != 1)
#endif
	  pos--;			/* Remove dupplicate '/' */
      }
      else if (pos-start > 1 && pos[-1] == FN_CURLIB && pos[-2] == FN_LIBCHAR)
	pos-=2;					/* Skip /./ */
      else if (pos > buff+1 && pos[-1] == FN_HOMELIB && pos[-2] == FN_LIBCHAR)
      {					/* Found ..../~/  */
	buff[0]=FN_HOMELIB;
	buff[1]=FN_LIBCHAR;
	start=buff; pos=buff+1;
      }
    }
  }
  (void) strmov(to,buff);
  DBUG_PRINT("exit",("to: '%s'",to));
  DBUG_RETURN((uint) (pos-buff));
} /* cleanup_dirname */


/*
  On system where you don't have symbolic links, the following
  code will allow you to create a file: 
  directory-name.sym that should contain the real path
  to the directory.  This will be used if the directory name
  doesn't exists
*/


my_bool my_use_symdir=0;	/* Set this if you want to use symdirs */

#ifdef USE_SYMDIR
void symdirget(char *dir)
{
  char buff[FN_REFLEN];
  char *pos=strend(dir);
  if (dir[0] && pos[-1] != FN_DEVCHAR && my_access(dir, F_OK))
  {
    File file;
    uint length;
    char temp= *(--pos);            /* May be "/" or "\" */
    strmov(pos,".sym");
    file= my_open(dir, O_RDONLY, MYF(0));
    *pos++=temp; *pos=0;	  /* Restore old filename */
    if (file >= 0)
    {
      if ((length= my_read(file, buff, sizeof(buff), MYF(0))) > 0)
      {
	for (pos= buff + length ;
	     pos > buff && (iscntrl(pos[-1]) || isspace(pos[-1])) ;
	     pos --);

	/* Ensure that the symlink ends with the directory symbol */
	if (pos == buff || pos[-1] != FN_LIBCHAR)
	  *pos++=FN_LIBCHAR;

	strmake(dir,buff, (uint) (pos-buff));
      }
      my_close(file, MYF(0));
    }
  }
}
#endif /* USE_SYMDIR */


/*
  Fixes a directroy name so that can be used by open()

  SYNOPSIS
    unpack_dirname()
    to			Store result here.  May be = from
    from		'Packed' directory name (may contain ~)

 IMPLEMENTATION
  Make that last char of to is '/' if from not empty and
  from doesn't end in FN_DEVCHAR
  Uses cleanup_dirname and changes ~/.. to home_dir/..

  Changes a UNIX filename to system filename (replaces / with \ on windows)

  RETURN
   Length of new directory name (= length of to)
*/

uint unpack_dirname(my_string to, const char *from)
{
  uint length,h_length;
  char buff[FN_REFLEN+1+4],*suffix,*tilde_expansion;
  DBUG_ENTER("unpack_dirname");

  (void) intern_filename(buff,from);		/* Change to intern name */
  length= (uint) strlen(buff);			/* Fix that '/' is last */
  if (length &&
#ifdef FN_DEVCHAR
      buff[length-1] != FN_DEVCHAR &&
#endif
      buff[length-1] != FN_LIBCHAR && buff[length-1] != '/')
  {
    buff[length]=FN_LIBCHAR;
    buff[length+1]= '\0';
  }

  length=cleanup_dirname(buff,buff);
  if (buff[0] == FN_HOMELIB)
  {
    suffix=buff+1; tilde_expansion=expand_tilde(&suffix);
    if (tilde_expansion)
    {
      length-=(uint) (suffix-buff)-1;
      if (length+(h_length= (uint) strlen(tilde_expansion)) <= FN_REFLEN)
      {
	if (tilde_expansion[h_length-1] == FN_LIBCHAR)
	  h_length--;
	if (buff+h_length < suffix)
	  bmove(buff+h_length,suffix,length);
	else
	  bmove_upp(buff+h_length+length,suffix+length,length);
	bmove(buff,tilde_expansion,h_length);
      }
    }
  }
#ifdef USE_SYMDIR
  if (my_use_symdir)
    symdirget(buff);
#endif
  DBUG_RETURN(system_filename(to,buff));	/* Fix for open */
} /* unpack_dirname */


	/* Expand tilde to home or user-directory */
	/* Path is reset to point at FN_LIBCHAR after ~xxx */

static my_string NEAR_F expand_tilde(my_string *path)
{
  if (path[0][0] == FN_LIBCHAR)
    return home_dir;			/* ~/ expanded to home */
#ifdef HAVE_GETPWNAM
  {
    char *str,save;
    struct passwd *user_entry;

    if (!(str=strchr(*path,FN_LIBCHAR)))
      str=strend(*path);
    save= *str; *str= '\0';
    user_entry=getpwnam(*path);
    *str=save;
    endpwent();
    if (user_entry)
    {
      *path=str;
      return user_entry->pw_dir;
    }
  }
#endif
  return (my_string) 0;
}


/*
  Fix filename so it can be used by open, create

  SYNOPSIS
    unpack_filename()
    to		Store result here. Must be at least of size FN_REFLEN.
    from	Filename in unix format (with ~)

  RETURN
    # length of to

  NOTES
    to may be == from
    ~ will only be expanded if total length < FN_REFLEN
*/


uint unpack_filename(my_string to, const char *from)
{
  uint length,n_length;
  char buff[FN_REFLEN];
  DBUG_ENTER("unpack_filename");

  length=dirname_part(buff,from);		/* copy & convert dirname */
  n_length=unpack_dirname(buff,buff);
  if (n_length+strlen(from+length) < FN_REFLEN)
  {
    (void) strmov(buff+n_length,from+length);
    length= system_filename(to,buff);		/* Fix to usably filename */
  }
  else
    length= system_filename(to,from);		/* Fix to usably filename */
  DBUG_RETURN(length);
} /* unpack_filename */


	/* Convert filename (unix standard) to system standard */
	/* Used before system command's like open(), create() .. */
	/* Returns length of to */

uint system_filename(my_string to, const char *from)
{
#ifndef FN_C_BEFORE_DIR
  return (uint) (strmake(to,from,FN_REFLEN-1)-to);
#else	/* VMS */

	/* change 'dev:lib/xxx' to 'dev:[lib]xxx' */
	/* change 'dev:xxx' to 'dev:xxx' */
	/* change './xxx' to 'xxx' */
	/* change './lib/' or lib/ to '[.lib]' */
	/* change '/x/y/z to '[x.y]x' */
	/* change 'dev:/x' to 'dev:[000000]x' */

  int libchar_found,length;
  my_string to_pos,from_pos,pos;
  char buff[FN_REFLEN];
  DBUG_ENTER("system_filename");

  libchar_found=0;
  (void) strmov(buff,from);			 /* If to == from */
  from_pos= buff;
  if ((pos=strrchr(from_pos,FN_DEVCHAR)))	/* Skip device part */
  {
    pos++;
    to_pos=strnmov(to,from_pos,(size_s) (pos-from_pos));
    from_pos=pos;
  }
  else
    to_pos=to;

  if (from_pos[0] == FN_CURLIB && from_pos[1] == FN_LIBCHAR)
    from_pos+=2;				/* Skip './' */
  if (strchr(from_pos,FN_LIBCHAR))
  {
    *(to_pos++) = FN_C_BEFORE_DIR;
    if (strinstr(from_pos,FN_ROOTDIR) == 1)
    {
      from_pos+=strlen(FN_ROOTDIR);		/* Actually +1 but... */
      if (! strchr(from_pos,FN_LIBCHAR))
      {						/* No dir, use [000000] */
	to_pos=strmov(to_pos,FN_C_ROOT_DIR);
	libchar_found++;
      }
    }
    else
      *(to_pos++)=FN_C_DIR_SEP;			/* '.' gives current dir */

    while ((pos=strchr(from_pos,FN_LIBCHAR)))
    {
      if (libchar_found++)
	*(to_pos++)=FN_C_DIR_SEP;		/* Add '.' between dirs */
      if (strinstr(from_pos,FN_PARENTDIR) == 1 &&
	  from_pos+strlen(FN_PARENTDIR) == pos)
	to_pos=strmov(to_pos,FN_C_PARENT_DIR);	/* Found '../' */
      else
	to_pos=strnmov(to_pos,from_pos,(size_s) (pos-from_pos));
      from_pos=pos+1;
    }
    *(to_pos++)=FN_C_AFTER_DIR;
  }
  length=(int) (strmov(to_pos,from_pos)-to);
  DBUG_PRINT("exit",("name: '%s'",to));
  DBUG_RETURN((uint) length);
#endif
} /* system_filename */


	/* Fix a filename to intern (UNIX format) */

my_string intern_filename(my_string to, const char *from)
{
#ifndef VMS
  {
    uint length;
    char buff[FN_REFLEN];
    if (from == to)
    {						/* Dirname may destroy from */
      strmov(buff,from);
      from=buff;
    }
    length=dirname_part(to,from);			/* Copy dirname & fix chars */
    (void) strcat(to,from+length);
    return (to);
  }
#else	/* VMS */

	/* change 'dev:[lib]xxx' to 'dev:lib/xxx' */
	/* change 'dev:xxx' to 'dev:xxx' */
	/* change 'dev:x/y/[.lib]' to 'dev:x/y/lib/ */
	/* change '[.lib]' to './lib/' */
	/* change '[x.y]' or '[x.][y]' or '[x][.y]' to '/x/y/' */
	/* change '[000000.x] or [x.000000]' to '/x/' */

  int par_length,root_length;
  my_string pos,from_pos,to_pos,end_pos;
  char buff[FN_REFLEN];

  convert_dirname(buff,from,NullS);		/* change '<>' to '[]' */
  from_pos=buff;
  if ((pos=strrchr(from_pos,FN_DEVCHAR)))	/* Skip device part */
  {
    pos++;
    to_pos=strnmov(to,from_pos,(size_s) (pos-from_pos));
    from_pos=pos;
  }
  else
    to_pos=to;

  root_length=strlen(FN_C_ROOT_DIR);
  if ((pos = strchr(from_pos,FN_C_BEFORE_DIR)) &&
      (end_pos = strrchr(pos+1,FN_C_AFTER_DIR)))
  {
    to_pos=strnmov(to_pos,from_pos,(size_s) (pos-from_pos));
				/* Copy all between ':' and '[' */
    from_pos=pos+1;
    if (strinstr(from_pos,FN_C_ROOT_DIR) == 1 &&
	(from_pos[root_length] == FN_C_DIR_SEP ||
	 from_pos[root_length] == FN_C_AFTER_DIR))
    {
      from_pos+=root_length+1;
    }
    else if (*from_pos == FN_C_DIR_SEP)
      *(to_pos++) = FN_CURLIB;			/* Set ./ first */
    *(to_pos++) = FN_LIBCHAR;

    par_length=strlen(FN_C_PARENT_DIR);
    pos=to_pos;
    for (; from_pos <= end_pos ; from_pos++)
    {
      switch (*from_pos) {
      case FN_C_DIR_SEP:
      case FN_C_AFTER_DIR:
	if (pos != to_pos)
	{
	  if ((int) (to_pos-pos) == root_length &&
	      is_suffix(pos,FN_C_ROOT_DIR))
	    to_pos=pos;				/* remove root-pos */
	  else
	  {
	    *(to_pos++)=FN_LIBCHAR;		/* Find lib */
	    pos=to_pos;
	  }
	}
	break;
      case FN_C_BEFORE_DIR:
	break;
      case '-':					/* *(FN_C_PARENT_DIR): */
	if (to_pos[-1] == FN_LIBCHAR &&
	    strncmp(from_pos,FN_C_PARENT_DIR,par_length) == 0)
	{					/* Change '-' to '..' */
	  to_pos=strmov(to_pos,FN_PARENTDIR);
	  *(to_pos++)=FN_LIBCHAR;
	  pos=to_pos;
	  from_pos+=par_length-1;
	  break;
	}
	/* Fall through */
      default:
	*(to_pos++)= *from_pos;
	break;
      }
    }
  }
  (void) strmov(to_pos,from_pos);
  return (to);
#endif /* VMS */
} /* intern_filename */