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ff802dc7bb
Maintain a pointer to the end of the stack string area instead of how much space is left. This simplifies the macros in memalloc.h. The places where the new variable must be updated are only where the memory area is created, destroyed or resized.
87 lines
3.3 KiB
C
87 lines
3.3 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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#include <string.h>
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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 char *sstrend;
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pointer ckmalloc(size_t);
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pointer ckrealloc(pointer, int);
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void ckfree(pointer);
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char *savestr(const 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 grabstackblock(int);
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char *growstackstr(void);
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char *makestrspace(int, char *);
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char *stputbin(const char *data, int len, char *p);
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char *stputs(const char *data, char *p);
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#define stackblock() stacknxt
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#define stackblocksize() stacknleft
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#define STARTSTACKSTR(p) p = stackblock()
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#define STPUTC(c, p) do { if (p == sstrend) p = growstackstr(); *p++ = (c); } while(0)
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#define CHECKSTRSPACE(n, p) { if (sstrend - p < n) p = makestrspace(n, p); }
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#define USTPUTC(c, p) (*p++ = (c))
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/*
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* STACKSTRNUL's use is where we want to be able to turn a stack
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* (non-sentinel, character counting string) into a C string,
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* and later pretend the NUL is not there.
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* Note: Because of STACKSTRNUL's semantics, STACKSTRNUL cannot be used
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* on a stack that will grabstackstr()ed.
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*/
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#define STACKSTRNUL(p) (p == sstrend ? (p = growstackstr(), *p = '\0') : (*p = '\0'))
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#define STUNPUTC(p) (--p)
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#define STTOPC(p) p[-1]
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#define STADJUST(amount, p) (p += (amount))
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#define grabstackstr(p) stalloc((char *)p - stackblock())
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#define ungrabstackstr(s, p) stunalloc((s))
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#define STPUTBIN(s, len, p) p = stputbin((s), (len), p)
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#define STPUTS(s, p) p = stputs((s), p)
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