/usr/include/leptonica/queue.h is in libleptonica-dev 1.69-2.
This file is owned by root:root, with mode 0o644.
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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 | /*====================================================================*
- Copyright (C) 2001 Leptonica. All rights reserved.
- This software is distributed in the hope that it will be
- useful, but with NO WARRANTY OF ANY KIND.
- No author or distributor accepts responsibility to anyone for the
- consequences of using this software, or for whether it serves any
- particular purpose or works at all, unless he or she says so in
- writing. Everyone is granted permission to copy, modify and
- redistribute this source code, for commercial or non-commercial
- purposes, with the following restrictions: (1) the origin of this
- source code must not be misrepresented; (2) modified versions must
- be plainly marked as such; and (3) this notice may not be removed
- or altered from any source or modified source distribution.
*====================================================================*/
#ifndef LEPTONICA_QUEUE_H
#define LEPTONICA_QUEUE_H
/*
* queue.h
*
* Expandable pointer queue for arbitrary void* data.
*
* The L_Queue is a fifo that implements a queue of void* pointers.
* It can be used to hold a queue of any type of struct.
*
* Internally, it maintains two counters:
* nhead: location of head (in ptrs) from the beginning
* of the array.
* nelem: number of ptr elements stored in the queue.
*
* The element at the head of the queue, which is the next to
* be removed, is array[nhead]. The location at the tail of the
* queue to which the next element will be added is
* array[nhead + nelem].
*
* As items are added to the queue, nelem increases.
* As items are removed, nhead increases and nelem decreases.
* Any time the tail reaches the end of the allocated array,
* all the pointers are shifted to the left, so that the head
* is at the beginning of the array.
* If the array becomes more than 3/4 full, it doubles in size.
*
* The auxiliary stack can be used in a wrapper for re-using
* items popped from the queue. It is not made by default.
*
* For further implementation details, see queue.c.
*/
struct L_Queue
{
l_int32 nalloc; /* size of allocated ptr array */
l_int32 nhead; /* location of head (in ptrs) from the */
/* beginning of the array */
l_int32 nelem; /* number of elements stored in the queue */
void **array; /* ptr array */
struct L_Stack *stack; /* auxiliary stack */
};
typedef struct L_Queue L_QUEUE;
#endif /* LEPTONICA_QUEUE_H */
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