113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2001 by Sun Microsystems, Inc.
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* All rights reserved.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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/*
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* Routines for manipulating stacks
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*/
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "stack.h"
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#include "memory.h"
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#define STACK_SEEDSIZE 5
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struct stk {
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int st_nument;
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int st_top;
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void **st_data;
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void (*st_free)(void *);
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};
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stk_t *
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stack_new(void (*freep)(void *))
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{
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stk_t *sp;
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sp = xmalloc(sizeof (stk_t));
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sp->st_nument = STACK_SEEDSIZE;
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sp->st_top = -1;
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sp->st_data = xmalloc(sizeof (void *) * sp->st_nument);
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sp->st_free = freep;
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return (sp);
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}
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void
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stack_free(stk_t *sp)
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{
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int i;
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if (sp->st_free) {
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for (i = 0; i <= sp->st_top; i++)
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sp->st_free(sp->st_data[i]);
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}
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free(sp->st_data);
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free(sp);
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}
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void *
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stack_pop(stk_t *sp)
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{
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assert(sp->st_top >= 0);
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return (sp->st_data[sp->st_top--]);
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}
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void *
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stack_peek(stk_t *sp)
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{
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if (sp->st_top == -1)
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return (NULL);
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return (sp->st_data[sp->st_top]);
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}
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void
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stack_push(stk_t *sp, void *data)
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{
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sp->st_top++;
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if (sp->st_top == sp->st_nument) {
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sp->st_nument += STACK_SEEDSIZE;
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sp->st_data = xrealloc(sp->st_data,
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sizeof (void *) * sp->st_nument);
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}
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sp->st_data[sp->st_top] = data;
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}
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int
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stack_level(stk_t *sp)
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{
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return (sp->st_top + 1);
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}
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