memalloc.h revision 213814 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)memalloc.h	8.2 (Berkeley) 5/4/95
33 * $FreeBSD: head/bin/sh/memalloc.h 213814 2010-10-13 23:29:09Z obrien $
34 */
35
36#include <string.h>
37
38struct stackmark {
39	struct stack_block *stackp;
40	char *stacknxt;
41	int stacknleft;
42        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 *);
64
65
66
67#define stackblock() stacknxt
68#define stackblocksize() stacknleft
69#define STARTSTACKSTR(p)	p = stackblock(), sstrnleft = stackblocksize()
70#define STPUTC(c, p)	(--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), --sstrnleft, *p++ = (c)))
71#define CHECKSTRSPACE(n, p)	{ if (sstrnleft < n) p = makestrspace(); }
72#define USTPUTC(c, p)	(--sstrnleft, *p++ = (c))
73/*
74 * STACKSTRNUL's use is where we want to be able to turn a stack
75 * (non-sentinel, character counting string) into a C string,
76 * and later pretend the NUL is not there.
77 * Note: Because of STACKSTRNUL's semantics, STACKSTRNUL cannot be used
78 * on a stack that will grabstackstr()ed.
79 */
80#define STACKSTRNUL(p)	(sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
81#define STUNPUTC(p)	(++sstrnleft, --p)
82#define STTOPC(p)	p[-1]
83#define STADJUST(amount, p)	(p += (amount), sstrnleft -= (amount))
84#define grabstackstr(p)	stalloc(stackblocksize() - sstrnleft)
85