xref: /csrg-svn/bin/sh/memalloc.h (revision 69272)
147128Sbostic /*-
260698Sbostic  * Copyright (c) 1991, 1993
360698Sbostic  *	The Regents of the University of California.  All rights reserved.
447128Sbostic  *
547128Sbostic  * This code is derived from software contributed to Berkeley by
647128Sbostic  * Kenneth Almquist.
747128Sbostic  *
847128Sbostic  * %sccs.include.redist.c%
947128Sbostic  *
10*69272Schristos  *	@(#)memalloc.h	8.2 (Berkeley) 05/04/95
1147128Sbostic  */
1247128Sbostic 
1347128Sbostic struct stackmark {
1447128Sbostic 	struct stack_block *stackp;
1547128Sbostic 	char *stacknxt;
1647128Sbostic 	int stacknleft;
1747128Sbostic };
1847128Sbostic 
1947128Sbostic 
2047128Sbostic extern char *stacknxt;
2147128Sbostic extern int stacknleft;
2247128Sbostic extern int sstrnleft;
2347128Sbostic extern int herefd;
2447128Sbostic 
25*69272Schristos pointer ckmalloc __P((int));
26*69272Schristos pointer ckrealloc __P((pointer, int));
27*69272Schristos char *savestr __P((char *));
28*69272Schristos pointer stalloc __P((int));
29*69272Schristos void stunalloc __P((pointer));
30*69272Schristos void setstackmark __P((struct stackmark *));
31*69272Schristos void popstackmark __P((struct stackmark *));
32*69272Schristos void growstackblock __P((void));
33*69272Schristos void grabstackblock __P((int));
34*69272Schristos char *growstackstr __P((void));
35*69272Schristos char *makestrspace __P((void));
36*69272Schristos void ungrabstackstr __P((char *, char *));
3747128Sbostic 
3847128Sbostic 
3947128Sbostic 
4047128Sbostic #define stackblock() stacknxt
4147128Sbostic #define stackblocksize() stacknleft
4247128Sbostic #define STARTSTACKSTR(p)	p = stackblock(), sstrnleft = stackblocksize()
4347128Sbostic #define STPUTC(c, p)	(--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
44*69272Schristos #define CHECKSTRSPACE(n, p)	{ if (sstrnleft < n) p = makestrspace(); }
4547128Sbostic #define USTPUTC(c, p)	(--sstrnleft, *p++ = (c))
4647128Sbostic #define STACKSTRNUL(p)	(sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
4747128Sbostic #define STUNPUTC(p)	(++sstrnleft, --p)
4847128Sbostic #define STTOPC(p)	p[-1]
4947128Sbostic #define STADJUST(amount, p)	(p += (amount), sstrnleft -= (amount))
5047128Sbostic #define grabstackstr(p)	stalloc(stackblocksize() - sstrnleft)
5147128Sbostic 
5247128Sbostic #define ckfree(p)	free((pointer)(p))
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