e8999de45c
No visible differences expected - there is a remote chance that some internal lossage may no longer occur in interactive shells that receive SIGINT (untrapped) at inopportune times, but you would have had to have been very unlucky to have ever suffered from that.
341 lines
8.5 KiB
C
341 lines
8.5 KiB
C
/* $NetBSD: memalloc.c,v 1.33 2019/02/09 03:35:55 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)memalloc.c 8.3 (Berkeley) 5/4/95";
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#else
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__RCSID("$NetBSD: memalloc.c,v 1.33 2019/02/09 03:35:55 kre Exp $");
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#endif
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#endif /* not lint */
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#include <stdlib.h>
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#include <unistd.h>
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#include "shell.h"
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#include "output.h"
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#include "memalloc.h"
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#include "error.h"
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#include "machdep.h"
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#include "mystring.h"
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/*
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* Like malloc, but returns an error when out of space.
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*/
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pointer
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ckmalloc(size_t nbytes)
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{
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pointer p;
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p = malloc(nbytes);
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if (p == NULL)
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error("Out of space");
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return p;
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}
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/*
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* Same for realloc.
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*/
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pointer
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ckrealloc(pointer p, int nbytes)
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{
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p = realloc(p, nbytes);
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if (p == NULL)
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error("Out of space");
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return p;
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}
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/*
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* Make a copy of a string in safe storage.
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*/
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char *
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savestr(const char *s)
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{
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char *p;
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p = ckmalloc(strlen(s) + 1);
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scopy(s, p);
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return p;
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}
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/*
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* Parse trees for commands are allocated in lifo order, so we use a stack
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* to make this more efficient, and also to avoid all sorts of exception
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* handling code to handle interrupts in the middle of a parse.
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*
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* The size 504 was chosen because the Ultrix malloc handles that size
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* well.
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*/
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#define MINSIZE 504 /* minimum size of a block */
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struct stack_block {
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struct stack_block *prev;
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char space[MINSIZE];
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};
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struct stack_block stackbase;
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struct stack_block *stackp = &stackbase;
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struct stackmark *markp;
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char *stacknxt = stackbase.space;
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int stacknleft = MINSIZE;
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int sstrnleft;
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int herefd = -1;
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pointer
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stalloc(int nbytes)
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{
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char *p;
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nbytes = SHELL_ALIGN(nbytes);
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if (nbytes > stacknleft) {
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int blocksize;
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struct stack_block *sp;
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blocksize = nbytes;
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if (blocksize < MINSIZE)
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blocksize = MINSIZE;
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INTOFF;
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sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
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sp->prev = stackp;
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stacknxt = sp->space;
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stacknleft = blocksize;
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stackp = sp;
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INTON;
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}
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INTOFF;
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p = stacknxt;
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stacknxt += nbytes;
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stacknleft -= nbytes;
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INTON;
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return p;
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}
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void
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stunalloc(pointer p)
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{
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if (p == NULL) { /*DEBUG */
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write(2, "stunalloc\n", 10);
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abort();
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}
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stacknleft += stacknxt - (char *)p;
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stacknxt = p;
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}
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/* save the current status of the sh stack */
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void
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setstackmark(struct stackmark *mark)
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{
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mark->stackp = stackp;
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mark->stacknxt = stacknxt;
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mark->stacknleft = stacknleft;
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mark->sstrnleft = sstrnleft;
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mark->marknext = markp;
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markp = mark;
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}
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/* reset the stack mark, and remove it from the list of marks */
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void
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popstackmark(struct stackmark *mark)
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{
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INTOFF;
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markp = mark->marknext; /* delete mark from the list */
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rststackmark(mark); /* and reset stack */
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INTON;
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}
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/* reset the shell stack to its state recorded in the stack mark */
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void
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rststackmark(struct stackmark *mark)
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{
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struct stack_block *sp;
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INTOFF;
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while (stackp != mark->stackp) {
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/* delete any recently allocated mem blocks */
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sp = stackp;
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stackp = sp->prev;
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ckfree(sp);
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}
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stacknxt = mark->stacknxt;
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stacknleft = mark->stacknleft;
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sstrnleft = mark->sstrnleft;
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INTON;
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}
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/*
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* When the parser reads in a string, it wants to stick the string on the
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* stack and only adjust the stack pointer when it knows how big the
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* string is. Stackblock (defined in stack.h) returns a pointer to a block
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* of space on top of the stack and stackblocklen returns the length of
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* this block. Growstackblock will grow this space by at least one byte,
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* possibly moving it (like realloc). Grabstackblock actually allocates the
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* part of the block that has been used.
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*/
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void
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growstackblock(void)
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{
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int newlen = SHELL_ALIGN(stacknleft * 2 + 100);
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INTOFF;
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if (stacknxt == stackp->space && stackp != &stackbase) {
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struct stack_block *oldstackp;
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struct stackmark *xmark;
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struct stack_block *sp;
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oldstackp = stackp;
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sp = stackp;
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stackp = sp->prev;
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sp = ckrealloc((pointer)sp,
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sizeof(struct stack_block) - MINSIZE + newlen);
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sp->prev = stackp;
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stackp = sp;
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stacknxt = sp->space;
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sstrnleft += newlen - stacknleft;
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stacknleft = newlen;
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/*
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* Stack marks pointing to the start of the old block
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* must be relocated to point to the new block
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*/
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xmark = markp;
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while (xmark != NULL && xmark->stackp == oldstackp) {
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xmark->stackp = stackp;
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xmark->stacknxt = stacknxt;
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xmark->sstrnleft += stacknleft - xmark->stacknleft;
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xmark->stacknleft = stacknleft;
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xmark = xmark->marknext;
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}
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} else {
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char *oldspace = stacknxt;
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int oldlen = stacknleft;
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char *p = stalloc(newlen);
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(void)memcpy(p, oldspace, oldlen);
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stacknxt = p; /* free the space */
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stacknleft += newlen; /* we just allocated */
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}
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INTON;
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}
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void
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grabstackblock(int len)
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{
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len = SHELL_ALIGN(len);
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INTOFF;
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stacknxt += len;
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stacknleft -= len;
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INTON;
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}
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/*
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* The following routines are somewhat easier to use than the above.
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* The user declares a variable of type STACKSTR, which may be declared
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* to be a register. The macro STARTSTACKSTR initializes things. Then
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* the user uses the macro STPUTC to add characters to the string. In
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* effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
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* grown as necessary. When the user is done, she can just leave the
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* string there and refer to it using stackblock(). Or she can allocate
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* the space for it using grabstackstr(). If it is necessary to allow
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* someone else to use the stack temporarily and then continue to grow
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* the string, the user should use grabstack to allocate the space, and
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* then call ungrabstr(p) to return to the previous mode of operation.
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*
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* USTPUTC is like STPUTC except that it doesn't check for overflow.
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* CHECKSTACKSPACE can be called before USTPUTC to ensure that there
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* is space for at least one character.
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*/
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char *
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growstackstr(void)
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{
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int len = stackblocksize();
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if (herefd >= 0 && len >= 1024) {
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xwrite(herefd, stackblock(), len);
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sstrnleft = len - 1;
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return stackblock();
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}
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growstackblock();
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sstrnleft = stackblocksize() - len - 1;
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return stackblock() + len;
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}
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/*
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* Called from CHECKSTRSPACE.
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*/
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char *
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makestrspace(void)
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{
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int len = stackblocksize() - sstrnleft;
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growstackblock();
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sstrnleft = stackblocksize() - len;
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return stackblock() + len;
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}
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/*
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* Note that this only works to release stack space for reuse
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* if nothing else has allocated space on the stack since the grabstackstr()
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*
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* "s" is the start of the area to be released, and "p" represents the end
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* of the string we have stored beyond there and are now releasing.
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* (ie: "p" should be the same as in the call to grabstackstr()).
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*
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* stunalloc(s) and ungrabstackstr(s, p) are almost interchangable after
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* a grabstackstr(), however the latter also returns string space so we
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* can just continue with STPUTC() etc without needing a new STARTSTACKSTR(s)
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*/
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void
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ungrabstackstr(char *s, char *p)
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{
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#ifdef DEBUG
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if (s < stacknxt || stacknxt + stacknleft < s)
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abort();
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#endif
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stacknleft += stacknxt - s;
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stacknxt = s;
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sstrnleft = stacknleft - (p - s);
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}
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