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memalloc.h revision 1.2 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)memalloc.h	5.1 (Berkeley) 3/7/91
     37  *
     38  *	$Id: memalloc.h,v 1.2 1993/03/22 08:04:00 cgd Exp $
     39  */
     40 
     41 struct stackmark {
     42 	struct stack_block *stackp;
     43 	char *stacknxt;
     44 	int stacknleft;
     45 };
     46 
     47 
     48 extern char *stacknxt;
     49 extern int stacknleft;
     50 extern int sstrnleft;
     51 extern int herefd;
     52 
     53 #ifdef __STDC__
     54 pointer ckmalloc(int);
     55 pointer ckrealloc(pointer, int);
     56 void free(pointer);		/* defined in C library */
     57 char *savestr(char *);
     58 pointer stalloc(int);
     59 void stunalloc(pointer);
     60 void setstackmark(struct stackmark *);
     61 void popstackmark(struct stackmark *);
     62 void growstackblock(void);
     63 void grabstackblock(int);
     64 char *growstackstr(void);
     65 char *makestrspace(void);
     66 void ungrabstackstr(char *, char *);
     67 #else
     68 pointer ckmalloc();
     69 pointer ckrealloc();
     70 void free();		/* defined in C library */
     71 char *savestr();
     72 pointer stalloc();
     73 void stunalloc();
     74 void setstackmark();
     75 void popstackmark();
     76 void growstackblock();
     77 void grabstackblock();
     78 char *growstackstr();
     79 char *makestrspace();
     80 void ungrabstackstr();
     81 #endif
     82 
     83 
     84 
     85 #define stackblock() stacknxt
     86 #define stackblocksize() stacknleft
     87 #define STARTSTACKSTR(p)	p = stackblock(), sstrnleft = stackblocksize()
     88 #define STPUTC(c, p)	(--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
     89 #define CHECKSTRSPACE(n, p)	if (sstrnleft < n) p = makestrspace(); else
     90 #define USTPUTC(c, p)	(--sstrnleft, *p++ = (c))
     91 #define STACKSTRNUL(p)	(sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
     92 #define STUNPUTC(p)	(++sstrnleft, --p)
     93 #define STTOPC(p)	p[-1]
     94 #define STADJUST(amount, p)	(p += (amount), sstrnleft -= (amount))
     95 #define grabstackstr(p)	stalloc(stackblocksize() - sstrnleft)
     96 
     97 #define ckfree(p)	free((pointer)(p))
     98