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56 lines
2.4 KiB
C
56 lines
2.4 KiB
C
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/*====================================================================*
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- Copyright (C) 2001 Leptonica. All rights reserved.
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- This software is distributed in the hope that it will be
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- useful, but with NO WARRANTY OF ANY KIND.
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- No author or distributor accepts responsibility to anyone for the
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- consequences of using this software, or for whether it serves any
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- particular purpose or works at all, unless he or she says so in
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- writing. Everyone is granted permission to copy, modify and
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- redistribute this source code, for commercial or non-commercial
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- purposes, with the following restrictions: (1) the origin of this
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- source code must not be misrepresented; (2) modified versions must
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- be plainly marked as such; and (3) this notice may not be removed
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- or altered from any source or modified source distribution.
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*====================================================================*/
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#ifndef LEPTONICA_STACK_H
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#define LEPTONICA_STACK_H
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/*
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* stack.h
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*
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* Expandable pointer stack for arbitrary void* data.
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*
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* The L_Stack is an array of void * ptrs, onto which arbitrary
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* objects can be stored. At any time, the number of
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* stored objects is stack->n. The object at the bottom
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* of the stack is at array[0]; the object at the top of
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* the stack is at array[n-1]. New objects are added
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* to the top of the stack, at the first available location,
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* which is array[n]. Objects are removed from the top of the
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* stack. When an attempt is made to remove an object from an
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* empty stack, the result is null. When the stack becomes
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* filled, so that n = nalloc, the size is doubled.
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*
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* The auxiliary stack can be used to store and remove
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* objects for re-use. It must be created by a separate
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* call to pstackCreate(). [Just imagine the chaos if
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* pstackCreate() created the auxiliary stack!]
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* pstackDestroy() checks for the auxiliary stack and removes it.
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*/
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/* Note that array[n] is the first null ptr in the array */
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struct L_Stack
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{
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l_int32 nalloc; /* size of ptr array */
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l_int32 n; /* number of stored elements */
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void **array; /* ptr array */
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struct L_Stack *auxstack; /* auxiliary stack */
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};
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typedef struct L_Stack L_STACK;
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#endif /* LEPTONICA_STACK_H */
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