1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* $NetBSD: memalloc.c,v 1.28 2003/08/07 09:05:34 agc Exp $ */ 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/*- 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Copyright (c) 1991, 1993 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * The Regents of the University of California. All rights reserved. 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * This code is derived from software contributed to Berkeley by 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Kenneth Almquist. 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Redistribution and use in source and binary forms, with or without 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * modification, are permitted provided that the following conditions 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * are met: 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * notice, this list of conditions and the following disclaimer. 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * documentation and/or other materials provided with the distribution. 18dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * may be used to endorse or promote products derived from this software 20dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * without specific prior written permission. 21dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * SUCH DAMAGE. 33dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 34dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 35dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <sys/cdefs.h> 36dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#ifndef lint 37dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#if 0 38dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstatic char sccsid[] = "@(#)memalloc.c 8.3 (Berkeley) 5/4/95"; 39dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#else 40dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project__RCSID("$NetBSD: memalloc.c,v 1.28 2003/08/07 09:05:34 agc Exp $"); 41dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#endif 42dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#endif /* not lint */ 43dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 44dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <stdlib.h> 45dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <unistd.h> 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "shell.h" 48dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "output.h" 49dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "memalloc.h" 50dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "error.h" 51dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "machdep.h" 52dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "mystring.h" 53dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 54dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 55dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Like malloc, but returns an error when out of space. 56dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 57dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 58dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectpointer 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectckmalloc(int nbytes) 60dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 61dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project pointer p; 62dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 63dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project p = malloc(nbytes); 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (p == NULL) 65dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project error("Out of space"); 66dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return p; 67dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 68dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 69dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 70dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 71dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Same for realloc. 72dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 73dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 74dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectpointer 75dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectckrealloc(pointer p, int nbytes) 76dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 77dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project p = realloc(p, nbytes); 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (p == NULL) 79dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project error("Out of space"); 80dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return p; 81dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 82dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 83dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 84dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 85dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Make a copy of a string in safe storage. 86dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 87dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 88dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectchar * 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectsavestr(const char *s) 90dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 91dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *p; 92dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project p = ckmalloc(strlen(s) + 1); 94dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project scopy(s, p); 95dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return p; 96dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 97dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 98dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 99dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 100dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Parse trees for commands are allocated in lifo order, so we use a stack 101dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * to make this more efficient, and also to avoid all sorts of exception 102dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * handling code to handle interrupts in the middle of a parse. 103dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 104dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * The size 504 was chosen because the Ultrix malloc handles that size 105dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * well. 106dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 107dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 108dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#define MINSIZE 504 /* minimum size of a block */ 109dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 110dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstruct stack_block { 111dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stack_block *prev; 112dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char space[MINSIZE]; 113dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project}; 114dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 115dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstruct stack_block stackbase; 116dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstruct stack_block *stackp = &stackbase; 117dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstruct stackmark *markp; 118dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectchar *stacknxt = stackbase.space; 119dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint stacknleft = MINSIZE; 120dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint sstrnleft; 121dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectint herefd = -1; 122dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 123dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectpointer 124dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstalloc(int nbytes) 125dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 126dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *p; 127dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 128dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project nbytes = SHELL_ALIGN(nbytes); 129dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (nbytes > stacknleft) { 130dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int blocksize; 131dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stack_block *sp; 132dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 133dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project blocksize = nbytes; 134dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (blocksize < MINSIZE) 135dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project blocksize = MINSIZE; 136dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTOFF; 137dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize); 138dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp->prev = stackp; 139dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = sp->space; 140dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft = blocksize; 141dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stackp = sp; 142dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTON; 143dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 144dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project p = stacknxt; 145dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt += nbytes; 146dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft -= nbytes; 147dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return p; 148dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 149dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 150dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 151dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 152dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectstunalloc(pointer p) 153dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 154dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (p == NULL) { /*DEBUG */ 155dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project write(2, "stunalloc\n", 10); 156dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project abort(); 157dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 158dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft += stacknxt - (char *)p; 159dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = p; 160dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 161dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 162dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 163dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 164dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 165dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectsetstackmark(struct stackmark *mark) 166dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 167dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project mark->stackp = stackp; 168dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project mark->stacknxt = stacknxt; 169dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project mark->stacknleft = stacknleft; 170dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project mark->marknext = markp; 171dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project markp = mark; 172dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 173dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 174dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 175dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 176dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectpopstackmark(struct stackmark *mark) 177dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 178dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stack_block *sp; 179dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 180dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTOFF; 181dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project markp = mark->marknext; 182dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (stackp != mark->stackp) { 183dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp = stackp; 184dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stackp = sp->prev; 185dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project ckfree(sp); 186dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 187dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = mark->stacknxt; 188dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft = mark->stacknleft; 189dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTON; 190dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 191dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 192dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 193dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 194dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * When the parser reads in a string, it wants to stick the string on the 195dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * stack and only adjust the stack pointer when it knows how big the 196dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * string is. Stackblock (defined in stack.h) returns a pointer to a block 197dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * of space on top of the stack and stackblocklen returns the length of 198dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * this block. Growstackblock will grow this space by at least one byte, 199dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * possibly moving it (like realloc). Grabstackblock actually allocates the 200dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * part of the block that has been used. 201dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 202dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 203dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 204dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectgrowstackblock(void) 205dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 206dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int newlen = SHELL_ALIGN(stacknleft * 2 + 100); 207dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 208dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (stacknxt == stackp->space && stackp != &stackbase) { 209dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stack_block *oldstackp; 210dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stackmark *xmark; 211dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project struct stack_block *sp; 212dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 213dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTOFF; 214dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project oldstackp = stackp; 215dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp = stackp; 216dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stackp = sp->prev; 217dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp = ckrealloc((pointer)sp, 218dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sizeof(struct stack_block) - MINSIZE + newlen); 219dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sp->prev = stackp; 220dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stackp = sp; 221dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = sp->space; 222dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft = newlen; 223dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 224dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project /* 225dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Stack marks pointing to the start of the old block 226dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * must be relocated to point to the new block 227dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 228dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xmark = markp; 229dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project while (xmark != NULL && xmark->stackp == oldstackp) { 230dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xmark->stackp = stackp; 231dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xmark->stacknxt = stacknxt; 232dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xmark->stacknleft = stacknleft; 233dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xmark = xmark->marknext; 234dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 235dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project INTON; 236dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } else { 237dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *oldspace = stacknxt; 238dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int oldlen = stacknleft; 239dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project char *p = stalloc(newlen); 240dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 241dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project (void)memcpy(p, oldspace, oldlen); 242dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = p; /* free the space */ 243dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft += newlen; /* we just allocated */ 244dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 245dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 246dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 247dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 248dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectgrabstackblock(int len) 249dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 250dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project len = SHELL_ALIGN(len); 251dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt += len; 252dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft -= len; 253dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 254dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 255dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 256dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * The following routines are somewhat easier to use than the above. 257dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * The user declares a variable of type STACKSTR, which may be declared 258dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * to be a register. The macro STARTSTACKSTR initializes things. Then 259dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * the user uses the macro STPUTC to add characters to the string. In 260dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is 261dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * grown as necessary. When the user is done, she can just leave the 262dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * string there and refer to it using stackblock(). Or she can allocate 263dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * the space for it using grabstackstr(). If it is necessary to allow 264dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * someone else to use the stack temporarily and then continue to grow 265dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * the string, the user should use grabstack to allocate the space, and 266dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * then call ungrabstr(p) to return to the previous mode of operation. 267dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * 268dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * USTPUTC is like STPUTC except that it doesn't check for overflow. 269dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * CHECKSTACKSPACE can be called before USTPUTC to ensure that there 270dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * is space for at least one character. 271dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 272dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 273dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectchar * 274dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectgrowstackstr(void) 275dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 276dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int len = stackblocksize(); 277dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project if (herefd >= 0 && len >= 1024) { 278dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project xwrite(herefd, stackblock(), len); 279dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sstrnleft = len - 1; 280dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return stackblock(); 281dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 282dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project growstackblock(); 283dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sstrnleft = stackblocksize() - len - 1; 284dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return stackblock() + len; 285dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 286dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 287dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* 288dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project * Called from CHECKSTRSPACE. 289dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project */ 290dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 291dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectchar * 292dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectmakestrspace(void) 293dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 294dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project int len = stackblocksize() - sstrnleft; 295dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project growstackblock(); 296dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sstrnleft = stackblocksize() - len; 297dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project return stackblock() + len; 298dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 299dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 300dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectvoid 301dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Projectungrabstackstr(char *s, char *p) 302dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project{ 303dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknleft += stacknxt - s; 304dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project stacknxt = s; 305dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project sstrnleft = stacknleft - (p - s); 306dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 307dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 308