minix/commands/ash/memalloc.h

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2005-04-21 16:53:53 +02:00
/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)memalloc.h 5.1 (Berkeley) 3/7/91
*/
struct stackmark {
struct stack_block *stackp;
char *stacknxt;
int stacknleft;
};
extern char *stacknxt;
extern int stacknleft;
extern int sstrnleft;
extern int herefd;
#ifdef __STDC__
pointer ckmalloc(int);
pointer ckrealloc(pointer, int);
void free(pointer); /* defined in C library */
char *savestr(char *);
pointer stalloc(int);
void stunalloc(pointer);
void setstackmark(struct stackmark *);
void popstackmark(struct stackmark *);
void growstackblock(void);
void grabstackblock(int);
char *growstackstr(void);
char *makestrspace(void);
void ungrabstackstr(char *, char *);
#else
pointer ckmalloc();
pointer ckrealloc();
void free(); /* defined in C library */
char *savestr();
pointer stalloc();
void stunalloc();
void setstackmark();
void popstackmark();
void growstackblock();
void grabstackblock();
char *growstackstr();
char *makestrspace();
void ungrabstackstr();
#endif
#define stackblock() stacknxt
#define stackblocksize() stacknleft
#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
#define CHECKSTRSPACE(n, p) if (sstrnleft < n) p = makestrspace(); else
#define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
#define STUNPUTC(p) (++sstrnleft, --p)
#define STTOPC(p) p[-1]
#define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
#define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
#define ckfree(p) free((pointer)(p))