xref: /freebsd/bin/sh/memalloc.h (revision 8ab2f5ecc596131f6ca790d6ae35540c06ed7985)
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  * $FreeBSD$
34  */
35 
36 struct stackmark {
37 	struct stack_block *stackp;
38 	char *stacknxt;
39 	int stacknleft;
40         struct stackmark *marknext;
41 };
42 
43 
44 extern char *stacknxt;
45 extern int stacknleft;
46 extern int sstrnleft;
47 extern int herefd;
48 
49 pointer ckmalloc(int);
50 pointer ckrealloc(pointer, int);
51 char *savestr(char *);
52 pointer stalloc(int);
53 void stunalloc(pointer);
54 void setstackmark(struct stackmark *);
55 void popstackmark(struct stackmark *);
56 void growstackblock(void);
57 void grabstackblock(int);
58 char *growstackstr(void);
59 char *makestrspace(void);
60 void ungrabstackstr(char *, char *);
61 
62 
63 
64 #define stackblock() stacknxt
65 #define stackblocksize() stacknleft
66 #define STARTSTACKSTR(p)	p = stackblock(), sstrnleft = stackblocksize()
67 #define STPUTC(c, p)	(--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
68 #define CHECKSTRSPACE(n, p)	{ if (sstrnleft < n) p = makestrspace(); }
69 #define USTPUTC(c, p)	(--sstrnleft, *p++ = (c))
70 #define STACKSTRNUL(p)	(sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
71 #define STUNPUTC(p)	(++sstrnleft, --p)
72 #define STTOPC(p)	p[-1]
73 #define STADJUST(amount, p)	(p += (amount), sstrnleft -= (amount))
74 #define grabstackstr(p)	stalloc(stackblocksize() - sstrnleft)
75 
76 #define ckfree(p)	free((pointer)(p))
77