1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright (c) 2001 by Sun Microsystems, Inc. 24*0Sstevel@tonic-gate * All rights reserved. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate /* 30*0Sstevel@tonic-gate * Routines for manipulating stacks 31*0Sstevel@tonic-gate */ 32*0Sstevel@tonic-gate 33*0Sstevel@tonic-gate #include <stdio.h> 34*0Sstevel@tonic-gate #include <assert.h> 35*0Sstevel@tonic-gate #include <stdlib.h> 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #include "stack.h" 38*0Sstevel@tonic-gate #include "memory.h" 39*0Sstevel@tonic-gate 40*0Sstevel@tonic-gate #define STACK_SEEDSIZE 5 41*0Sstevel@tonic-gate 42*0Sstevel@tonic-gate struct stk { 43*0Sstevel@tonic-gate int st_nument; 44*0Sstevel@tonic-gate int st_top; 45*0Sstevel@tonic-gate void **st_data; 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate void (*st_free)(void *); 48*0Sstevel@tonic-gate }; 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate stk_t * stack_new(void (* freep)(void *))51*0Sstevel@tonic-gatestack_new(void (*freep)(void *)) 52*0Sstevel@tonic-gate { 53*0Sstevel@tonic-gate stk_t *sp; 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate sp = xmalloc(sizeof (stk_t)); 56*0Sstevel@tonic-gate sp->st_nument = STACK_SEEDSIZE; 57*0Sstevel@tonic-gate sp->st_top = -1; 58*0Sstevel@tonic-gate sp->st_data = xmalloc(sizeof (void *) * sp->st_nument); 59*0Sstevel@tonic-gate sp->st_free = freep; 60*0Sstevel@tonic-gate 61*0Sstevel@tonic-gate return (sp); 62*0Sstevel@tonic-gate } 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate void stack_free(stk_t * sp)65*0Sstevel@tonic-gatestack_free(stk_t *sp) 66*0Sstevel@tonic-gate { 67*0Sstevel@tonic-gate int i; 68*0Sstevel@tonic-gate 69*0Sstevel@tonic-gate if (sp->st_free) { 70*0Sstevel@tonic-gate for (i = 0; i <= sp->st_top; i++) 71*0Sstevel@tonic-gate sp->st_free(sp->st_data[i]); 72*0Sstevel@tonic-gate } 73*0Sstevel@tonic-gate free(sp->st_data); 74*0Sstevel@tonic-gate free(sp); 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate 77*0Sstevel@tonic-gate void * stack_pop(stk_t * sp)78*0Sstevel@tonic-gatestack_pop(stk_t *sp) 79*0Sstevel@tonic-gate { 80*0Sstevel@tonic-gate assert(sp->st_top >= 0); 81*0Sstevel@tonic-gate 82*0Sstevel@tonic-gate return (sp->st_data[sp->st_top--]); 83*0Sstevel@tonic-gate } 84*0Sstevel@tonic-gate 85*0Sstevel@tonic-gate void * stack_peek(stk_t * sp)86*0Sstevel@tonic-gatestack_peek(stk_t *sp) 87*0Sstevel@tonic-gate { 88*0Sstevel@tonic-gate if (sp->st_top == -1) 89*0Sstevel@tonic-gate return (NULL); 90*0Sstevel@tonic-gate 91*0Sstevel@tonic-gate return (sp->st_data[sp->st_top]); 92*0Sstevel@tonic-gate } 93*0Sstevel@tonic-gate 94*0Sstevel@tonic-gate void stack_push(stk_t * sp,void * data)95*0Sstevel@tonic-gatestack_push(stk_t *sp, void *data) 96*0Sstevel@tonic-gate { 97*0Sstevel@tonic-gate sp->st_top++; 98*0Sstevel@tonic-gate 99*0Sstevel@tonic-gate if (sp->st_top == sp->st_nument) { 100*0Sstevel@tonic-gate sp->st_nument += STACK_SEEDSIZE; 101*0Sstevel@tonic-gate sp->st_data = xrealloc(sp->st_data, 102*0Sstevel@tonic-gate sizeof (void *) * sp->st_nument); 103*0Sstevel@tonic-gate } 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate sp->st_data[sp->st_top] = data; 106*0Sstevel@tonic-gate } 107*0Sstevel@tonic-gate 108*0Sstevel@tonic-gate int stack_level(stk_t * sp)109*0Sstevel@tonic-gatestack_level(stk_t *sp) 110*0Sstevel@tonic-gate { 111*0Sstevel@tonic-gate return (sp->st_top + 1); 112*0Sstevel@tonic-gate } 113