This file is indexed.

/usr/include/mailutils/list.h is in libmailutils-dev 1:2.99.99-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
/* GNU Mailutils -- a suite of utilities for electronic mail
   Copyright (C) 1999-2000, 2005, 2007-2008, 2010-2012, 2014-2015 Free
   Software Foundation, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General
   Public License along with this library.  If not, see 
   <http://www.gnu.org/licenses/>. */

#ifndef _MAILUTILS_LIST_H
#define _MAILUTILS_LIST_H

#include <mailutils/types.h>

#ifdef __cplusplus
extern "C" {
#endif

  /* ************************************************* */
  /* List creation and destruction                     */
  /* ************************************************* */
int mu_list_create (mu_list_t *_plist);
void mu_list_destroy (mu_list_t *_plist);
  /* Remove all elements from the list, reclaiming the associated memory
     if necessary (see mu_list_set_destroy_item), but don't destroy the
     list itself. */
void mu_list_clear (mu_list_t _list);

  /* ************************************************* */
  /* List Comparators                                  */
  /* ************************************************* */
  
  /* A comparator is associated with each list, which is used to compare
     two elements for equality.  The comparator is a function of
     mu_list_comparator_t type, which returns 0 if its arguments are equal
     and non-zero otherwise: */
typedef int (*mu_list_comparator_t) (const void*, const void*);
  /* The default comparator function compares two pointers for equality. */
int _mu_list_ptr_comparator (const void*, const void*);
  /* Set _cmp as a new comparator function for _list.  Return old
     comparator. */
mu_list_comparator_t mu_list_set_comparator (mu_list_t _list,
					     mu_list_comparator_t _cmp);
  /* Returns in _pcmp a pointer to the comparator function of _list: */
int mu_list_get_comparator (mu_list_t _list, mu_list_comparator_t *_pcmp);

  /* ************************************************* */
  /* Memory management                                 */
  /* ************************************************* */

  /* The destroy function is responsible for deallocating a list element.
     By default, it is not set. */
typedef void (*mu_list_destroy_item_t) (void *);

  /* An often used destroy function.  It simply calls free(3) over the
     _item. */
void mu_list_free_item (void *_item);

  /* Sets the destroy function for _list and returns old destroy
     function: */
mu_list_destroy_item_t mu_list_set_destroy_item (mu_list_t _list,
			   mu_list_destroy_item_t _destroy_item);

  /* ************************************************* */
  /* List informational functions:                     */
  /* ************************************************* */

  /* Return true if _list has no items. */
int mu_list_is_empty (mu_list_t _list);
  /* Write the number of items currently in _list to the memory location
     pointed to by _pcount. */
int mu_list_count    (mu_list_t _list, size_t *_pcount);

  /* ************************************************* */
  /* Functions for retrieving list elements:           */
  /* ************************************************* */
  
  /* Get _indexth element from the list and store it in _pitem. */
int mu_list_get      (mu_list_t _list, size_t _index, void **_pitem);
  /* Retrieve first element of _list */
int mu_list_head (mu_list_t _list, void **_pitem);
  /* Retrieve last element of _list */
int mu_list_tail (mu_list_t _list, void **_pitem);
  
  /* Store at most _count first elements from _list in the _array.  Unless
     _pcount is NULL, fill it with the actual number of elements copied. */
int mu_list_to_array (mu_list_t _list, void **_array, size_t _count,
		      size_t *_pcount);
  /* Look for the element matching _item (in the sense of the item comparator
     method, see mu_list_set_comparator) and return it in the memory location
     pointed to by _ret_item. */
int mu_list_locate   (mu_list_t list, void *item, void **ret_item);
  
  /* ************************************************* */
  /* Functions for adding and removing elements:       */
  /* ************************************************* */
  
  /* Add _item to the tail of the _list. */
int mu_list_append   (mu_list_t _list, void *_item);
  /* Add _item to the head of the _list */
int mu_list_prepend  (mu_list_t _list, void *_item);
  /* Insert _item after _new_item in _list (or before it, if _insert_before
     is 1. */
int mu_list_insert   (mu_list_t _list, void *_item, void *_new_item, 
                      int _insert_before);
  /* Remove _item from _list and deallocate any memory associated with it
     using the `destroy_item' method. */
int mu_list_remove   (mu_list_t _list, void *_item);
  /* A non-destructive version of mu_list_remove: removes the _item but does
     not deallocate it. */
int mu_list_remove_nd  (mu_list_t _list, void *_item);
  /* Remove Nth element from the list. */
int mu_list_remove_nth (mu_list_t list, size_t n);
  /* Remove Nth element from the list, non-destructive. */
int mu_list_remove_nth_nd (mu_list_t list, size_t n);
  /* Find _old_item in _list and if found, replace it with _new_item,
     deallocating the removed item via the `destroy_item' method. */
int mu_list_replace  (mu_list_t _list, void *_old_item, void *_new_item);
  /* A non-destructive version of mu_list_replace: the removed item is not
     deallocated. */
int mu_list_replace_nd (mu_list_t _list, void *_old_item, void *_new_item);

  /* ************************************************* */
  /* LIFO Access                                       */
  /* ************************************************* */
int mu_list_push (mu_list_t list, void *item);
int mu_list_pop (mu_list_t list, void **item);
  

  /* ************************************************* */
  /* Interation over lists.                            */
  /* ************************************************* */

  /* Get iterator for this _list and return it in _pitr, if successful. */
int mu_list_get_iterator (mu_list_t _list, mu_iterator_t *_pitr);

  /* A general-purpose iteration function.  When called, _item points to
     the item currently visited and _data points to call-specific data. */
typedef int (*mu_list_action_t) (void *_item, void *_data);

  /* Execute _action for each element in _list.  Use _data as the call-specific
     data.  If _dir is 0, traverse the list from head to tail.  If it is 1,
     traverse it in the reverse direction */
int mu_list_foreach_dir (mu_list_t _list, int _dir, mu_list_action_t _action,
			 void *_cbdata);
  /* Same as mu_list_foreach_dir with _dir==0. */
int mu_list_foreach (mu_list_t _list, mu_list_action_t _action, void *_data);
  /* A historical alias to the above. */
int mu_list_do (mu_list_t, mu_list_action_t, void *) MU_DEPRECATED;
  

  /* ************************************************* */
  /* Functions for combining two lists.                */
  /* ************************************************* */

  /* Move elements from _new_list to _list, adding them to the tail of
     the latter. */
void mu_list_append_list (mu_list_t _list, mu_list_t _new_list);
  /* Move elements from _new_list to _list, adding them to the head of
     the latter. */
void mu_list_prepend_list (mu_list_t _list, mu_list_t _new_list);

  /* Move data from _new_list to _list, inserting them after the
     element matching _anchor (in the sense of _list's comparator
     function).  If _insert_before is 1, items are inserted before
     _achor instead. */
int mu_list_insert_list (mu_list_t _list, void *_anchor,
			 mu_list_t _new_list,
			 int _insert_before);

  /* Compute an intersection of two lists (_list1 and _list2) and return
     it in _pdest.  The resulting list contains elements from _list1 that
     are also encountered in _list2 (as per comparison function of
     the latter).
     
     If _dup_item is not NULL, it is called to create copies of
     items to be stored in _pdest.  In this case, the destroy_item
     function of _list2 is also attached to _pdest.

     The _dup_item parameters are: a pointer for returned data, the
     original item and call-specific data.  The _dup_data 
     argument is passed as the 3rd argument in each call to _dup_item.
     
     If _dup_item is NULL, pointers to elements are stored and
     no destroy_item function is assigned. */
int mu_list_intersect_dup (mu_list_t *_pdest,
			   mu_list_t _list1, mu_list_t _list2,
			   int (*_dup_item) (void **, void *, void *),
			   void *_dup_data);
  
  /* Same as mu_list_intersect_dup with _dup_item = NULL */
int mu_list_intersect (mu_list_t *, mu_list_t, mu_list_t);

  /* ************************************************* */
  /* List slicing                                      */
  /* ************************************************* */
  /* Create a new list from elements of _list located between
     indices in _posv.  Return the result in _pdest.  
     The resulting list will contain elements between _posv[0] and
     _posv[1], _posv[2] and _posv[3], ..., _posv[_posc-2]
     and _posv[_posc-1], inclusive.  If _posc is an odd number, an extra
     element with the value [count-1] (where count is the number of
     elements in _list) is implied.

     The elements in _posv are sorted in ascending order prior to use. 
     
     See mu_list_intersect_dup for a description of _dup_item and
     _dup_data */
int mu_list_slice_dup (mu_list_t *_pdest, mu_list_t _list,
		       size_t *_posv, size_t _posc,
		       int (*_dup_item) (void **, void *, void *),
		       void *_dup_data);
  /* Same as mu_list_slice_dup invoked with _dup_item=NULL */
int mu_list_slice (mu_list_t *_pdest, mu_list_t _list,
		   size_t *_posv, size_t _posc);
  
  /* Two functions for the most common case: */
  /* Create a slice containing elements between indices _from and
     _to in the _list.

     See mu_list_intersect_dup for a description of _dup_item and
     _dup_data */
int mu_list_slice2_dup (mu_list_t *_pdest, mu_list_t _list,
			size_t _from, size_t _to,
			int (*_dup_item) (void **, void *, void *),
			void *_dup_data);
  /* Same as mu_list_slice2_dup with _dup_item=NULL */
int mu_list_slice2 (mu_list_t *_pdest, mu_list_t _list,
                    size_t _from, size_t _to);
  

  /* ************************************************* */
  /* List mapper functions                             */
  /* ************************************************* */
  
typedef int (*mu_list_mapper_t) (void **_itmv, size_t _itmc, void *_call_data);

/* A generalized list mapping function.

   Mu_list_gmap iterates over the _list, gathering its elements in an
   array of type void **.  Each time _nelem elements has been collected,
   it calls the _map function, passing it as arguments the constructed array,
   the number of elements in it (which can be less than _nelem on the last
   call), and call-specific _data.  Iteration continues while _map returns 0
   and until all elements from the array have been visited.

   Mu_list_gmap returns 0 on success and a non-zero error code on failure.
   If _map returns non-zero, its return value is propagated to the caller.

   The _map function is not allowed to alter the _list.
*/
   
int mu_list_gmap (mu_list_t _list, mu_list_mapper_t _map, size_t _nelem,
		  void *_data);
  
  
#define MU_LIST_MAP_OK     0x00
#define MU_LIST_MAP_SKIP   0x01
#define MU_LIST_MAP_STOP   0x02

/* List-to-list mapping.
   
   Apply the list mapping function _map to each _nelem elements from the source
   _list and use its return values to form a new list, which will be returned
   in _res.

   The _map function gets pointers to the collected elements in its first
   argument (_itmv).  Its second argument (_itmc) keeps the number of elements
   filled in there.  It can be less than _nelem on the last call to _map.
   The _data pointer is passed as the 3rd argument.

   The return value from _map governs the mapping process.  Unless it has the
   MU_LIST_MAP_SKIP bit set, the _itmv[0] element is appended to the new
   list.  If it has MU_LIST_MAP_STOP bit set, iteration is stopped
   immediately and any remaining elements in _list are ignored.

   The mapper function (_map) is not allowed to alter the _list.
*/

int mu_list_map (mu_list_t _list, mu_list_mapper_t _map,
		 void *_data, size_t _nelem,
		 mu_list_t *_res);

  /* ************************************************* */
  /* List folding                                      */
  /* ************************************************* */

typedef int (*mu_list_folder_t) (void *_item, void *_data,
				 void *_prev, void **_ret);

  /* mu_list_fold iterates over list elements from first to last.
     For each element it calls _fold with the following arguments:

       _item     -  the current list element,
       _data     -  call-specific data,
       _prev     -  on the first call, _init; on subsequent calls,
                    points to the value returned from the previous call
		    to _fold in the _ret varialble,
       _ret      -  memory location where to store the result of this
                    call.

     When all elements have been visited, mu_list_fold stores the result
     of the last _fold invocation (as returned in *_ret) in the memory
     location pointed to by _return_value.

     If _fold returns a non-zero value, mu_list_fold stops iteration and
     returns this value.  The *_return_value is filled in this case as
     well.

     Possible return codes:

       0                   - success,
       EINVAL              - _list or _fold is NULL,
       MU_ERR_OUT_PTR_NULL - _return_code is NULL
       other value         - non-zero value returned by _fold.

     The _fold function is not allowed to alter the list it is being applied
     to.
       
     The mu_list_rfold acts similarly, except that it iterates over list
     elements from last to first.
  */
int mu_list_fold (mu_list_t _list, mu_list_folder_t _fold, void *_data,
		  void *_init, void *_return_value);
int mu_list_rfold (mu_list_t _list, mu_list_folder_t _fold, void *_data,
		   void *_init, void *_return_value);

  /* ************************************************* */
  /* Sorting                                           */
  /* ************************************************* */

  /* Sort _list using quicksort algorithm.  Use _comp to compare elements.
     If it is NULL, use the comparator method of _list.

     Comparator must return 0 if the two elements are equal, -1 if
     first of them is less than the second, and +1 otherwise.
  */
void mu_list_sort (mu_list_t _list, mu_list_comparator_t _comp);
  
#ifdef __cplusplus
}
#endif

#endif /* _MAILUTILS_LIST_H */