edc0ef345c
(1) it needs to be ALIGNed for both halves of the 'if,' and (2) if you're going to claim that you now have ALIGN(newlen) bytes left, you should have actually allocated ALIGN(newlen), rather than just 'newlen' bytes.
306 lines
7.1 KiB
C
306 lines
7.1 KiB
C
/* $NetBSD: memalloc.c,v 1.17 1996/05/20 14:49:32 cgd 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#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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static char rcsid[] = "$NetBSD: memalloc.c,v 1.17 1996/05/20 14:49:32 cgd Exp $";
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#endif
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#endif /* not lint */
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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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#include <stdlib.h>
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#include <unistd.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(nbytes)
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int nbytes;
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{
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register pointer p;
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if ((p = malloc(nbytes)) == 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(p, nbytes)
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register pointer p;
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int nbytes;
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{
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if ((p = realloc(p, nbytes)) == 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(s)
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char *s;
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{
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register 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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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(nbytes)
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int nbytes;
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{
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register char *p;
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nbytes = 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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p = stacknxt;
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stacknxt += nbytes;
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stacknleft -= nbytes;
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return p;
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}
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void
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stunalloc(p)
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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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void
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setstackmark(mark)
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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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}
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void
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popstackmark(mark)
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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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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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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() {
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char *p;
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int newlen = ALIGN(stacknleft * 2 + 100);
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char *oldspace = stacknxt;
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int oldlen = stacknleft;
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struct stack_block *sp;
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if (stacknxt == stackp->space && stackp != &stackbase) {
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INTOFF;
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sp = stackp;
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stackp = sp->prev;
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sp = ckrealloc((pointer)sp, 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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stacknleft = newlen;
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INTON;
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} else {
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p = stalloc(newlen);
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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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}
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void
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grabstackblock(len)
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int len;
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{
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len = ALIGN(len);
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stacknxt += len;
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stacknleft -= len;
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}
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/*
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* The following routines are somewhat easier to use that 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() {
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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() {
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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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void
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ungrabstackstr(s, p)
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char *s;
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char *p;
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{
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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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