memalloc.h revision 215783 
190792Sgshapiro/*-
2261363Sgshapiro * Copyright (c) 1991, 1993
390792Sgshapiro *	The Regents of the University of California.  All rights reserved.
490792Sgshapiro *
590792Sgshapiro * This code is derived from software contributed to Berkeley by
690792Sgshapiro * Kenneth Almquist.
790792Sgshapiro *
890792Sgshapiro * Redistribution and use in source and binary forms, with or without
9266692Sgshapiro * modification, are permitted provided that the following conditions
1090792Sgshapiro * are met:
1190792Sgshapiro * 1. Redistributions of source code must retain the above copyright
1290792Sgshapiro *    notice, this list of conditions and the following disclaimer.
1390792Sgshapiro * 2. Redistributions in binary form must reproduce the above copyright
14110560Sgshapiro *    notice, this list of conditions and the following disclaimer in the
15110560Sgshapiro *    documentation and/or other materials provided with the distribution.
16110560Sgshapiro * 4. Neither the name of the University nor the names of its contributors
17110560Sgshapiro *    may be used to endorse or promote products derived from this software
18110560Sgshapiro *    without specific prior written permission.
19110560Sgshapiro *
20110560Sgshapiro * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21110560Sgshapiro * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2290792Sgshapiro * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2390792Sgshapiro * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2490792Sgshapiro * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2590792Sgshapiro * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2690792Sgshapiro * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2790792Sgshapiro * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2890792Sgshapiro * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2990792Sgshapiro * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3090792Sgshapiro * SUCH DAMAGE.
3190792Sgshapiro *
3290792Sgshapiro *	@(#)memalloc.h	8.2 (Berkeley) 5/4/95
3390792Sgshapiro * $FreeBSD: head/bin/sh/memalloc.h 215783 2010-11-23 22:17:39Z jilles $
3490792Sgshapiro */
35110560Sgshapiro
36110560Sgshapiro#include <string.h>
37110560Sgshapiro
3890792Sgshapirostruct stackmark {
3990792Sgshapiro	struct stack_block *stackp;
4090792Sgshapiro	char *stacknxt;
4190792Sgshapiro	int stacknleft;
4290792Sgshapiro        struct stackmark *marknext;
43};
44
45
46extern char *stacknxt;
47extern int stacknleft;
48extern int sstrnleft;
49extern int herefd;
50
51pointer ckmalloc(size_t);
52pointer ckrealloc(pointer, int);
53void ckfree(pointer);
54char *savestr(const char *);
55pointer stalloc(int);
56void stunalloc(pointer);
57void setstackmark(struct stackmark *);
58void popstackmark(struct stackmark *);
59void growstackblock(void);
60void grabstackblock(int);
61char *growstackstr(void);
62char *makestrspace(void);
63void ungrabstackstr(char *, char *);
64char *stputbin(const char *data, int len, char *p);
65char *stputs(const char *data, char *p);
66
67
68
69#define stackblock() stacknxt
70#define stackblocksize() stacknleft
71#define STARTSTACKSTR(p)	p = stackblock(), sstrnleft = stackblocksize()
72#define STPUTC(c, p)	(--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), --sstrnleft, *p++ = (c)))
73#define CHECKSTRSPACE(n, p)	{ if (sstrnleft < n) p = makestrspace(); }
74#define USTPUTC(c, p)	(--sstrnleft, *p++ = (c))
75/*
76 * STACKSTRNUL's use is where we want to be able to turn a stack
77 * (non-sentinel, character counting string) into a C string,
78 * and later pretend the NUL is not there.
79 * Note: Because of STACKSTRNUL's semantics, STACKSTRNUL cannot be used
80 * on a stack that will grabstackstr()ed.
81 */
82#define STACKSTRNUL(p)	(sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
83#define STUNPUTC(p)	(++sstrnleft, --p)
84#define STTOPC(p)	p[-1]
85#define STADJUST(amount, p)	(p += (amount), sstrnleft -= (amount))
86#define grabstackstr(p)	stalloc(stackblocksize() - sstrnleft)
87#define STPUTBIN(s, len, p)	p = stputbin((s), (len), p)
88#define STPUTS(s, p)	p = stputs((s), p)
89