bin/sh/memalloc.h

   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  * 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  8.2 (Berkeley) 5/4/95
  37  * $FreeBSD: src/bin/sh/memalloc.h,v 1.10 2005/10/28 10:45:19 stefanf Exp $
  38  * $DragonFly: src/bin/sh/memalloc.h,v 1.4 2007/01/14 03:59:57 pavalos Exp $
  39  */
  40
  41 struct stackmark {
  42         struct stack_block *stackp;
  43         char *stacknxt;
  44         int stacknleft;
  45         struct stackmark *marknext;
  46 };
  47
  48
  49 extern char *stacknxt;
  50 extern int stacknleft;
  51 extern int sstrnleft;
  52 extern int herefd;
  53
  54 pointer ckmalloc(int);
  55 pointer ckrealloc(pointer, int);
  56 void ckfree(pointer);
  57 char *savestr(const 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
  68
  69
  70 #define stackblock() stacknxt
  71 #define stackblocksize() stacknleft
  72 #define STARTSTACKSTR(p)        p = stackblock(), sstrnleft = stackblocksize()
  73 #define STPUTC(c, p)    (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
  74 #define CHECKSTRSPACE(n, p)     { if (sstrnleft < n) p = makestrspace(); }
  75 #define USTPUTC(c, p)   (--sstrnleft, *p++ = (c))
  76 #define STACKSTRNUL(p)  (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
  77 #define STUNPUTC(p)     (++sstrnleft, --p)
  78 #define STTOPC(p)       p[-1]
  79 #define STADJUST(amount, p)     (p += (amount), sstrnleft -= (amount))
  80 #define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)