This file is indexed.

/usr/include/wvstreams/uniconfgen.h is in libwvstreams-dev 4.6.1-7.

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
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
/* -*- Mode: C++ -*-
 * Worldvisions Weaver Software:
 *   Copyright (C) 2002 Net Integration Technologies, Inc.
 * 
 * An abstract data container that backs a UniConf tree.
 */
#ifndef __UNICONFGEN_H
#define __UNICONFGEN_H
 
#include "uniconfpair.h"
#include "wvcallbacklist.h"
#include "wvtr1.h"

class UniConfGen;
class UniListIter;

/**
 * The callback type for signalling key changes from a UniConfGen.
 * 
 * Generators that wrap other generators should catch notifications
 * and reissue them using themselves as the "gen" parameter and their
 * userdata as the "userdata parameter".  This can be done effectively by
 * invoking the delta() function on receipt of a notification from a
 * wrapped generator.  See UniFilterGen.
 * 
 * Parameters: gen, key, userdata
 *   gen - the externally visible generator whose key has changed
 *   key - the key that has changed
 */
typedef wv::function<void(const UniConfKey&, WvStringParm)> 
    UniConfGenCallback;

/**
 * An abstract data container that backs a UniConf tree.
 *
 * This is intended to be implemented to provide support for fetching
 * and storing keys and values using different access methods.
 */
class IUniConfGen : public IObject
{
public:
    virtual ~IUniConfGen();
    
    /***** Notification API *****/
    
    /** Adds a callback for change notification. */
    virtual void add_callback(void *cookie,
			      const UniConfGenCallback &callback) = 0;
    
    /** Removes a callback for change notification. */
    virtual void del_callback(void *cookie) = 0;
    

    /***** Status API *****/
    
    /**
     * Determines if the generator is usable and working properly.
     * The default implementation always returns true.
     */
    virtual bool isok() = 0;

    
    /***** Key Persistence API *****/
    
    /** Commits any changes. The default implementation does nothing. */
    virtual void commit() = 0;
    
    /**
     * Refreshes information about a key recursively.
     * May discard uncommitted data.
     *
     * The default implementation always returns true.
     */
    virtual bool refresh() = 0;

    /** 
     * Flushes any commitment/notification buffers . 
     *
     * The default implementation always returns true.
     *  NOTE: This method should be 'protected'
     */
    virtual void flush_buffers() = 0;

    /***** Key Retrieval API *****/
    
    /**
     * Indicate that we will eventually be interested in doing get(),
     * haschildren(), or other "get-like" operations on a particular key
     * or tree of keys.  The generator may be able to speed up these
     * operations by, say, caching them in advance.
     * 
     * This function is not allowed to do blocking operations.  It is allowed
     * to do nothing at all, however, and then get() might block later.
     */
    virtual void prefetch(const UniConfKey &key, bool recursive) = 0;
    
    /**
     * Fetches a string value for a key from the registry.  If the key doesn't
     * exist, the return value has .isnull() == true.
     */
    virtual WvString get(const UniConfKey &key) = 0;
    
    /**
     * Without fetching its value, returns true if a key exists.
     *
     * This is provided because it is often more efficient to
     * test existance than to actually retrieve the value.
     *
     * The default implementation returns !get(key).isnull().
     */
    virtual bool exists(const UniConfKey &key) = 0;


    /**
     * Converts a string to an integer.  If the string is null or not
     * recognized, return defvalue. 
     *
     * This is here to support the common str2int(get(key)).
     *
     * The default implementation recognizes the booleans 'true', 'yes', 'on'
     * and 'enabled' as 1, and 'false', 'no', 'off' and 'disabled' as 0.
     */
    virtual int str2int(WvStringParm s, int defvalue) const = 0;

    
    /***** Key Storage API *****/
    
    /**
     * Stores a string value for a key into the registry.  If the value is
     * WvString::null, the key is deleted.
     */
    virtual void set(const UniConfKey &key, WvStringParm value) = 0;


    /**
     * Stores multiple key-value pairs into the registry.  If the value is
     * WvString::null, the key is deleted.
     */
    virtual void setv(const UniConfPairList &pairs) = 0;


    /***** Key Enumeration API *****/
    
    /**
     * Returns true if a key has children.
     *
     * This is provided because it is often more efficient to
     * test existance than to actually retrieve the keys.
     * 
     * The default implementation uses the iterator returned by iterator()
     * to test whether the child has any keys.
     * Subclasses are strongly encouraged to provide a better implementation.
     */
    virtual bool haschildren(const UniConfKey &key) = 0;

    /** The abstract iterator type (see below) */
    class Iter;

    /** A concrete null iterator type (see below) */
    class NullIter;
    
    /** An iterator over a constant list of keys (see below) */
    typedef ::UniListIter ListIter;

    /**
     * Returns an iterator over the children of the specified key.
     * May return NULL or an empty iterator if the key has no children.
     *
     * The caller takes ownership of the returned iterator and is responsible
     * for deleting it when finished.
     */
    virtual Iter *iterator(const UniConfKey &key) = 0;
    
    /**
     * Like iterator(), but the returned iterator is recursive, that is,
     * it will return children of the immediate children, not just the
     * immediate children themselves.
     * 
     * May return NULL if the key has no immediate children (since that means
     * there are also no indirect children).
     * 
     * Note that UniConfGen::recursiveiterator() is a default
     * implementation that just calls iterator() recursively, so it'll work
     * in any derived class without you overriding this function.  However,
     * you might want to do it anyway if it would be more efficient in your
     * particular case.
     */
    virtual Iter *recursiveiterator(const UniConfKey &key) = 0;
};

DEFINE_IID(IUniConfGen, {0x7ca76e98, 0xb694, 0x43ca,
    {0xb0, 0x56, 0x8b, 0x9d, 0xde, 0x9a, 0xbe, 0x9f}});


/**
 * A default implementation of IUniConfGen, providing various handy features
 * that save trouble when implementing typical generators.
 */
class UniConfGen : public IUniConfGen
{
    IMPLEMENT_IOBJECT(UniConfGen);

    // These fields are deliberately hidden to encourage use of the
    // special notification members

    WvCallbackList<UniConfGenCallback> cblist;
    int hold_nesting;
    UniConfPairList deltas;
    
protected:
    /** Creates a UniConfGen object. */
    UniConfGen();

public:
    /** Destroys the UniConfGen and may discard uncommitted data. */
    virtual ~UniConfGen();

    /***** Notification API *****/
    
    /**
     * Adds a callback for change notification.
     * Must *not* be reimplemented by subclasses of UniConfGen.
     */
    virtual void add_callback(void *cookie, 
			      const UniConfGenCallback &callback);
    virtual void del_callback(void *cookie);
    
    /**
     * Immediately sends notification that a key has possibly changed.
     * Takes care of the details of invoking the callback.
     *
     * Note: You probably want to be using delta() instead.
     */
    void dispatch_delta(const UniConfKey &key, WvStringParm value);

    /**
     * Pauses notifications until matched with a call to unhold_delta().
     * 
     * While paused, notification events are placed into a pending list.
     * Redundant notifications may be discarded.
     *
     * Use this to safeguard non-reentrant code.
     */
    void hold_delta();

    /**
     * Resumes notifications when each hold_delta() has been matched.
     * 
     * On resumption, dispatches all pending notifications except
     * those that were destined to watches that were removed.
     * 
     * Use this to safeguard non-reentrant code.
     */
    void unhold_delta();

    /**
     * Clears the list of pending notifications without sending them.
     * Does not affect the hold nesting count.
     */
    void clear_delta();

    /**
     * Flushes the list of pending notifications by sending them.
     * Does not affect the hold nesting count.
     */
    void flush_delta();

    /**
     * Call this when a key's value or children have possibly changed.
     * 
     * If the hold nesting count is 0, the notification is sent immediately.
     * Otherwise it is added to a pending list for later.
     */
    void delta(const UniConfKey &key, WvStringParm value);   
    
    /***** Status API *****/
    virtual bool isok();
    
    /***** Key Persistence API *****/
    virtual void commit() { }
    virtual bool refresh() { return true; }
    virtual void prefetch(const UniConfKey &key, bool recursive) { }
    virtual WvString get(const UniConfKey &key) = 0;
    virtual bool exists(const UniConfKey &key);
    virtual int str2int(WvStringParm s, int defvalue) const;

    /***** Key Storage API *****/
    virtual void set(const UniConfKey &key, WvStringParm value) = 0;
    virtual void setv(const UniConfPairList &pairs) = 0;

    virtual void flush_buffers() = 0;

    /***** Key Enumeration API *****/
    virtual bool haschildren(const UniConfKey &key);
    virtual Iter *iterator(const UniConfKey &key) = 0;
    
    // a helpful default that just calls iterator() recursively
    virtual Iter *recursiveiterator(const UniConfKey &key);

protected:
    // A naive implementation of setv() that uses only set().
    void setv_naive(const UniConfPairList &pairs);
};

DeclareWvList(IUniConfGen);
DeclareWvList2(UniConfGenList, IUniConfGen);


/**
 * An abstract iterator over keys and values in a generator.
 *
 * Unlike other WvStreams iterators, this one declares virtual methods so
 * that UniConfGen implementations can supply the right behaviour
 * through a common interface that does not depend on static typing.
 *
 * The precise traversal sequence is defined by the iterator implementation.
 *
 * The iterator need not support concurrent modifications of the underlying
 * data structures.
 * 
 * TODO: Consider changing this rule depending on observed usage patterns.
 */
class UniConfGen::Iter
{
public:
    /** Destroys the iterator. */
    virtual ~Iter() { }

    /**
     * Rewinds the iterator.
     * Must be called prior to the first invocation of next().
     */
    virtual void rewind() = 0;

    /**
     * Seeks to the next element in the sequence.
     * Returns true if that element exists.
     * Must be called prior to the first invocation of key().
     */
    virtual bool next() = 0;

    /** Returns the current key. */
    virtual UniConfKey key() const = 0;
    
    /** 
     * Returns the value of the current key.  You could just do a get(),
     * but maybe your generator has a more efficient way.
     */
    virtual WvString value() const = 0;
};


/**
 * An iterator that's always empty.
 * This is handy if you don't have anything good to iterate over.
 */
class UniConfGen::NullIter : public UniConfGen::Iter
{
public:
    /***** Overridden members *****/
    
    virtual void rewind() { }
    virtual bool next() { return false; }
    virtual UniConfKey key() const { return UniConfKey::EMPTY; }
    virtual WvString value() const { return WvString(); }
};


#endif // __UNICONFGEN_H