54091cfc82
ckrealloc and ckfree (added), respectively. sh jumps out of the signal handler
using longjmp which is obviously a bad idea during malloc calls.
Note: I think there is still a small race here because volatile sig_atomic_t
only guarantees atomic reads and writes while we're doing increments and
decrements.
Protect a setmode call with INT{ON,OFF} as it calls malloc internally.
PR: 45478
Patch from: Nate Eldredge
76 lines
2.9 KiB
C
76 lines
2.9 KiB
C
/*-
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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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* 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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* @(#)memalloc.h 8.2 (Berkeley) 5/4/95
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* $FreeBSD$
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*/
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struct stackmark {
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struct stack_block *stackp;
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char *stacknxt;
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int stacknleft;
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struct stackmark *marknext;
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};
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extern char *stacknxt;
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extern int stacknleft;
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extern int sstrnleft;
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extern int herefd;
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pointer ckmalloc(int);
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pointer ckrealloc(pointer, int);
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void ckfree(pointer);
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char *savestr(char *);
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pointer stalloc(int);
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void stunalloc(pointer);
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void setstackmark(struct stackmark *);
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void popstackmark(struct stackmark *);
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void growstackblock(void);
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void grabstackblock(int);
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char *growstackstr(void);
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char *makestrspace(void);
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void ungrabstackstr(char *, char *);
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#define stackblock() stacknxt
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#define stackblocksize() stacknleft
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#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
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#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
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#define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(); }
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#define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
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#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
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#define STUNPUTC(p) (++sstrnleft, --p)
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#define STTOPC(p) p[-1]
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#define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
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#define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
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