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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgfortran/] [intrinsics/] [chmod.c] - Blame information for rev 775

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1 733 jeremybenn 
/* Implementation of the CHMOD intrinsic.
2 
   Copyright (C) 2006, 2007, 2009, 2012 Free Software Foundation, Inc.
3 
   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
4 
 
5 
This file is part of the GNU Fortran runtime library (libgfortran).
6 
 
7 
Libgfortran is free software; you can redistribute it and/or
8 
modify it under the terms of the GNU General Public
9 
License as published by the Free Software Foundation; either
10 
version 3 of the License, or (at your option) any later version.
11 
 
12 
Libgfortran is distributed in the hope that it will be useful,
13 
but WITHOUT ANY WARRANTY; without even the implied warranty of
14 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 
GNU General Public License for more details.
16 
 
17 
Under Section 7 of GPL version 3, you are granted additional
18 
permissions described in the GCC Runtime Library Exception, version
19 
3.1, as published by the Free Software Foundation.
20 
 
21 
You should have received a copy of the GNU General Public License and
22 
a copy of the GCC Runtime Library Exception along with this program;
23 
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24 
<http://www.gnu.org/licenses/>.  */
25 
 
26 
#include "libgfortran.h"
27 
 
28 
#if defined(HAVE_SYS_STAT_H)
29 
 
30 
#include <stdbool.h>
31 
#include <string.h>     /* For memcpy. */
32 
#include <sys/stat.h>   /* For stat, chmod and umask.  */
33 
 
34 
 
35 
/* INTEGER FUNCTION CHMOD (NAME, MODE)
36 
   CHARACTER(len=*), INTENT(IN) :: NAME, MODE
37 
 
38 
   Sets the file permission "chmod" using a mode string.
39 
 
40 
   For MinGW, only _S_IWRITE and _S_IREAD are supported. To set those,
41 
   only the user attributes are used.
42 
 
43 
   The mode string allows for the same arguments as POSIX's chmod utility.
44 
   a) string containing an octal number.
45 
   b) Comma separated list of clauses of the form:
46 
      [<who-list>]<op>[<perm-list>|<permcopy>][<op>[<perm-list>|<permcopy>],...]
47 
      <who> - 'u', 'g', 'o', 'a'
48 
      <op>  - '+', '-', '='
49 
      <perm> - 'r', 'w', 'x', 'X', 's', t'
50 
   If <op> is not followed by a perm-list or permcopy, '-' and '+' do not
51 
   change the mode while '=' clears all file mode bits. 'u' stands for the
52 
   user permissions, 'g' for the group and 'o' for the permissions for others.
53 
   'a' is equivalent to 'ugo'. '+' sets the given permission in addition to
54 
   the ones of the file, '-' unsets the given permissions of the file, while
55 
   '=' sets the file to that mode. 'r' sets the read, 'w' the write, and
56 
   'x' the execute mode. 'X' sets the execute bit if the file is a directory
57 
   or if the user, group or other executable bit is set. 't' sets the sticky
58 
   bit, 's' (un)sets the and/or S_ISUID/S_ISGID bit.
59 
 
60 
   Note that if <who> is omitted, the permissions are filtered by the umask.
61 
 
62 
   A return value of 0 indicates success, -1 an error of chmod() while 1
63 
   indicates a mode parsing error.  */
64 
 
65 
extern int chmod_func (char *, char *, gfc_charlen_type, gfc_charlen_type);
66 
export_proto(chmod_func);
67 
 
68 
int
69 
chmod_func (char *name, char *mode, gfc_charlen_type name_len,
70 
            gfc_charlen_type mode_len)
71 
{
72 
  char * file;
73 
  int i;
74 
  bool ugo[3];
75 
  bool rwxXstugo[9];
76 
  int set_mode, part;
77 
  bool is_dir, honor_umask, continue_clause = false;
78 
  mode_t mode_mask, file_mode, new_mode;
79 
  struct stat stat_buf;
80 
 
81 
  /* Trim trailing spaces of the file name.  */
82 
  while (name_len > 0 && name[name_len - 1] == ' ')
83 
    name_len--;
84 
 
85 
  /* Make a null terminated copy of the file name.  */
86 
  file = gfc_alloca (name_len + 1);
87 
  memcpy (file, name, name_len);
88 
  file[name_len] = '\0';
89 
 
90 
  if (mode_len == 0)
91 
    return 1;
92 
 
93 
  if (mode[0] >= '0' && mode[0] <= '9')
94 
    {
95 
#ifdef __MINGW32__
96 
      unsigned mode;
97 
      if (sscanf (mode, "%o", &mode) != 1)
98 
        return 1;
99 
      file_mode = (mode_t) mode;
100 
#else
101 
      if (sscanf (mode, "%o", &file_mode) != 1)
102 
        return 1;
103 
#endif
104 
      return chmod (file, file_mode);
105 
    }
106 
 
107 
  /* Read the current file mode. */
108 
  if (stat (file, &stat_buf))
109 
    return 1;
110 
 
111 
  file_mode = stat_buf.st_mode & ~S_IFMT;
112 
  is_dir = stat_buf.st_mode & S_IFDIR;
113 
 
114 
#ifdef HAVE_UMASK
115 
  /* Obtain the umask without distroying the setting.  */
116 
  mode_mask = 0;
117 
  mode_mask = umask (mode_mask);
118 
  (void) umask (mode_mask);
119 
#else
120 
  honor_umask = false;
121 
#endif
122 
 
123 
  for (i = 0; i < mode_len; i++)
124 
    {
125 
      if (!continue_clause)
126 
        {
127 
          ugo[0] = false;
128 
          ugo[1] = false;
129 
          ugo[2] = false;
130 
#ifdef HAVE_UMASK
131 
          honor_umask = true;
132 
#endif
133 
        }
134 
      continue_clause = false;
135 
      rwxXstugo[0] = false;
136 
      rwxXstugo[1] = false;
137 
      rwxXstugo[2] = false;
138 
      rwxXstugo[3] = false;
139 
      rwxXstugo[4] = false;
140 
      rwxXstugo[5] = false;
141 
      rwxXstugo[6] = false;
142 
      rwxXstugo[7] = false;
143 
      rwxXstugo[8] = false;
144 
      rwxXstugo[9] = false;
145 
      part = 0;
146 
      set_mode = -1;
147 
      for (; i < mode_len; i++)
148 
        {
149 
          switch (mode[i])
150 
            {
151 
            /* User setting: a[ll]/u[ser]/g[roup]/o[ther].  */
152 
            case 'a':
153 
              if (part > 1)
154 
                return 1;
155 
              ugo[0] = true;
156 
              ugo[1] = true;
157 
              ugo[2] = true;
158 
              part = 1;
159 
#ifdef HAVE_UMASK
160 
              honor_umask = false;
161 
#endif
162 
              break;
163 
            case 'u':
164 
              if (part == 2)
165 
                {
166 
                  rwxXstugo[6] = true;
167 
                  part = 4;
168 
                  break;
169 
                }
170 
              if (part > 1)
171 
                return 1;
172 
              ugo[0] = true;
173 
              part = 1;
174 
#ifdef HAVE_UMASK
175 
              honor_umask = false;
176 
#endif
177 
              break;
178 
            case 'g':
179 
              if (part == 2)
180 
                {
181 
                  rwxXstugo[7] = true;
182 
                  part = 4;
183 
                  break;
184 
                }
185 
              if (part > 1)
186 
                return 1;
187 
              ugo[1] = true;
188 
              part = 1;
189 
#ifdef HAVE_UMASK
190 
              honor_umask = false;
191 
#endif
192 
              break;
193 
            case 'o':
194 
              if (part == 2)
195 
                {
196 
                  rwxXstugo[8] = true;
197 
                  part = 4;
198 
                  break;
199 
                }
200 
              if (part > 1)
201 
                return 1;
202 
              ugo[2] = true;
203 
              part = 1;
204 
#ifdef HAVE_UMASK
205 
              honor_umask = false;
206 
#endif
207 
              break;
208 
 
209 
            /* Mode setting: =+-.  */
210 
            case '=':
211 
              if (part > 2)
212 
                {
213 
                  continue_clause = true;
214 
                  i--;
215 
                  part = 2;
216 
                  goto clause_done;
217 
                }
218 
              set_mode = 1;
219 
              part = 2;
220 
              break;
221 
 
222 
            case '-':
223 
              if (part > 2)
224 
                {
225 
                  continue_clause = true;
226 
                  i--;
227 
                  part = 2;
228 
                  goto clause_done;
229 
                }
230 
              set_mode = 2;
231 
              part = 2;
232 
              break;
233 
 
234 
            case '+':
235 
              if (part > 2)
236 
                {
237 
                  continue_clause = true;
238 
                  i--;
239 
                  part = 2;
240 
                  goto clause_done;
241 
                }
242 
              set_mode = 3;
243 
              part = 2;
244 
              break;
245 
 
246 
            /* Permissions: rwxXst - for ugo see above.  */
247 
            case 'r':
248 
              if (part != 2 && part != 3)
249 
                return 1;
250 
              rwxXstugo[0] = true;
251 
              part = 3;
252 
              break;
253 
 
254 
            case 'w':
255 
              if (part != 2 && part != 3)
256 
                return 1;
257 
              rwxXstugo[1] = true;
258 
              part = 3;
259 
              break;
260 
 
261 
            case 'x':
262 
              if (part != 2 && part != 3)
263 
                return 1;
264 
              rwxXstugo[2] = true;
265 
              part = 3;
266 
              break;
267 
 
268 
            case 'X':
269 
              if (part != 2 && part != 3)
270 
                return 1;
271 
              rwxXstugo[3] = true;
272 
              part = 3;
273 
              break;
274 
 
275 
            case 's':
276 
              if (part != 2 && part != 3)
277 
                return 1;
278 
              rwxXstugo[4] = true;
279 
              part = 3;
280 
              break;
281 
 
282 
            case 't':
283 
              if (part != 2 && part != 3)
284 
                return 1;
285 
              rwxXstugo[5] = true;
286 
              part = 3;
287 
              break;
288 
 
289 
            /* Tailing blanks are valid in Fortran.  */
290 
            case ' ':
291 
              for (i++; i < mode_len; i++)
292 
                if (mode[i] != ' ')
293 
                  break;
294 
              if (i != mode_len)
295 
                return 1;
296 
              goto clause_done;
297 
 
298 
            case ',':
299 
              goto clause_done;
300 
 
301 
            default:
302 
              return 1;
303 
            }
304 
        }
305 
 
306 
clause_done:
307 
      if (part < 2)
308 
        return 1;
309 
 
310 
      new_mode = 0;
311 
 
312 
#ifdef __MINGW32__
313 
 
314 
      /* Read. */
315 
      if (rwxXstugo[0] && (ugo[0] || honor_umask))
316 
        new_mode |= _S_IREAD;
317 
 
318 
      /* Write. */
319 
      if (rwxXstugo[1] && (ugo[0] || honor_umask))
320 
        new_mode |= _S_IWRITE;
321 
 
322 
#else
323 
 
324 
      /* Read. */
325 
      if (rwxXstugo[0])
326 
        {
327 
          if (ugo[0] || honor_umask)
328 
            new_mode |= S_IRUSR;
329 
          if (ugo[1] || honor_umask)
330 
            new_mode |= S_IRGRP;
331 
          if (ugo[2] || honor_umask)
332 
            new_mode |= S_IROTH;
333 
        }
334 
 
335 
      /* Write.  */
336 
      if (rwxXstugo[1])
337 
        {
338 
          if (ugo[0] || honor_umask)
339 
            new_mode |= S_IWUSR;
340 
          if (ugo[1] || honor_umask)
341 
            new_mode |= S_IWGRP;
342 
          if (ugo[2] || honor_umask)
343 
            new_mode |= S_IWOTH;
344 
        }
345 
 
346 
      /* Execute. */
347 
      if (rwxXstugo[2])
348 
        {
349 
          if (ugo[0] || honor_umask)
350 
            new_mode |= S_IXUSR;
351 
          if (ugo[1] || honor_umask)
352 
            new_mode |= S_IXGRP;
353 
          if (ugo[2] || honor_umask)
354 
            new_mode |= S_IXOTH;
355 
        }
356 
 
357 
      /* 'X' execute.  */
358 
      if (rwxXstugo[3]
359 
          && (is_dir || (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
360 
        new_mode |= (S_IXUSR | S_IXGRP | S_IXOTH);
361 
 
362 
      /* 's'.  */
363 
      if (rwxXstugo[4])
364 
        {
365 
          if (ugo[0] || honor_umask)
366 
            new_mode |= S_ISUID;
367 
          if (ugo[1] || honor_umask)
368 
            new_mode |= S_ISGID;
369 
        }
370 
 
371 
      /* As original 'u'.  */
372 
      if (rwxXstugo[6])
373 
        {
374 
          if (ugo[1] || honor_umask)
375 
            {
376 
              if (file_mode & S_IRUSR)
377 
                new_mode |= S_IRGRP;
378 
              if (file_mode & S_IWUSR)
379 
                new_mode |= S_IWGRP;
380 
              if (file_mode & S_IXUSR)
381 
                new_mode |= S_IXGRP;
382 
            }
383 
          if (ugo[2] || honor_umask)
384 
            {
385 
              if (file_mode & S_IRUSR)
386 
                new_mode |= S_IROTH;
387 
              if (file_mode & S_IWUSR)
388 
                new_mode |= S_IWOTH;
389 
              if (file_mode & S_IXUSR)
390 
                new_mode |= S_IXOTH;
391 
            }
392 
        }
393 
 
394 
      /* As original 'g'.  */
395 
      if (rwxXstugo[7])
396 
        {
397 
          if (ugo[0] || honor_umask)
398 
            {
399 
              if (file_mode & S_IRGRP)
400 
                new_mode |= S_IRUSR;
401 
              if (file_mode & S_IWGRP)
402 
                new_mode |= S_IWUSR;
403 
              if (file_mode & S_IXGRP)
404 
                new_mode |= S_IXUSR;
405 
            }
406 
          if (ugo[2] || honor_umask)
407 
            {
408 
              if (file_mode & S_IRGRP)
409 
                new_mode |= S_IROTH;
410 
              if (file_mode & S_IWGRP)
411 
                new_mode |= S_IWOTH;
412 
              if (file_mode & S_IXGRP)
413 
                new_mode |= S_IXOTH;
414 
            }
415 
        }
416 
 
417 
      /* As original 'o'.  */
418 
      if (rwxXstugo[8])
419 
        {
420 
          if (ugo[0] || honor_umask)
421 
            {
422 
              if (file_mode & S_IROTH)
423 
                new_mode |= S_IRUSR;
424 
              if (file_mode & S_IWOTH)
425 
                new_mode |= S_IWUSR;
426 
              if (file_mode & S_IXOTH)
427 
                new_mode |= S_IXUSR;
428 
            }
429 
          if (ugo[1] || honor_umask)
430 
            {
431 
              if (file_mode & S_IROTH)
432 
                new_mode |= S_IRGRP;
433 
              if (file_mode & S_IWOTH)
434 
                new_mode |= S_IWGRP;
435 
              if (file_mode & S_IXOTH)
436 
                new_mode |= S_IXGRP;
437 
            }
438 
        }
439 
#endif  /* __MINGW32__ */
440 
 
441 
#ifdef HAVE_UMASK
442 
    if (honor_umask)
443 
      new_mode &= ~mode_mask;
444 
#endif
445 
 
446 
    if (set_mode == 1)
447 
      {
448 
#ifdef __MINGW32__
449 
        if (ugo[0] || honor_umask)
450 
          file_mode = (file_mode & ~(_S_IWRITE | _S_IREAD))
451 
                      | (new_mode & (_S_IWRITE | _S_IREAD));
452 
#else
453 
        /* Set '='.  */
454 
        if ((ugo[0] || honor_umask) && !rwxXstugo[6])
455 
          file_mode = (file_mode & ~(S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR))
456 
                      | (new_mode & (S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR));
457 
        if ((ugo[1] || honor_umask) && !rwxXstugo[7])
458 
          file_mode = (file_mode & ~(S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP))
459 
                      | (new_mode & (S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP));
460 
        if ((ugo[2] || honor_umask) && !rwxXstugo[8])
461 
          file_mode = (file_mode & ~(S_IROTH | S_IWOTH | S_IXOTH))
462 
                      | (new_mode & (S_IROTH | S_IWOTH | S_IXOTH));
463 
        if (is_dir && rwxXstugo[5])
464 
          file_mode |= S_ISVTX;
465 
        else if (!is_dir)
466 
          file_mode &= ~S_ISVTX;
467 
#endif
468 
      }
469 
    else if (set_mode == 2)
470 
      {
471 
        /* Clear '-'.  */
472 
        file_mode &= ~new_mode;
473 
#ifndef __MINGW32__
474 
        if (rwxXstugo[5] || !is_dir)
475 
          file_mode &= ~S_ISVTX;
476 
#endif
477 
      }
478 
    else if (set_mode == 3)
479 
      {
480 
        file_mode |= new_mode;
481 
#ifndef __MINGW32__
482 
        if (rwxXstugo[5] && is_dir)
483 
          file_mode |= S_ISVTX;
484 
        else if (!is_dir)
485 
          file_mode &= ~S_ISVTX;
486 
#endif
487 
      }
488 
  }
489 
 
490 
  return chmod (file, file_mode);
491 
}
492 
 
493 
 
494 
extern void chmod_i4_sub (char *, char *, GFC_INTEGER_4 *,
495 
                          gfc_charlen_type, gfc_charlen_type);
496 
export_proto(chmod_i4_sub);
497 
 
498 
void
499 
chmod_i4_sub (char *name, char *mode, GFC_INTEGER_4 * status,
500 
              gfc_charlen_type name_len, gfc_charlen_type mode_len)
501 
{
502 
  int val;
503 
 
504 
  val = chmod_func (name, mode, name_len, mode_len);
505 
  if (status)
506 
    *status = val;
507 
}
508 
 
509 
 
510 
extern void chmod_i8_sub (char *, char *, GFC_INTEGER_8 *,
511 
                          gfc_charlen_type, gfc_charlen_type);
512 
export_proto(chmod_i8_sub);
513 
 
514 
void
515 
chmod_i8_sub (char *name, char *mode, GFC_INTEGER_8 * status,
516 
              gfc_charlen_type name_len, gfc_charlen_type mode_len)
517 
{
518 
  int val;
519 
 
520 
  val = chmod_func (name, mode, name_len, mode_len);
521 
  if (status)
522 
    *status = val;
523 
}
524 
 
525 
#endif

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