/*      $NetBSD: vmbuf.h,v 1.6 2025/03/07 15:55:30 christos Exp $       */

/* Id: vmbuf.h,v 1.4 2005/10/30 10:28:44 vanhu Exp */

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
 */

#ifndef _VMBUF_H
#define _VMBUF_H

/*
 *      bp      v
 *      v       v
 *      ........................
 *              <--------------> l
 *      <----------------------> bl
 */
typedef struct _vchar_t_ {
#if notyet
        uint32_t t;     /* type of the value */
        vchar_t *n;     /* next vchar_t buffer */
        size_t bl;      /* length of the buffer */
        caddr_t bp;     /* pointer to the buffer */
#endif
        size_t l;       /* length of the value */
        caddr_t v;      /* place holder to the pointer to the value */
} vchar_t;

#define VPTRINIT(p) \
do { \
        if (p) { \
                vfree(p); \
                (p) = NULL; \
        } \
} while(0)

#if defined(__APPLE__) && defined(__MACH__)
/* vfree is already defined in Apple's system libraries */
#define vfree   vmbuf_free
#endif

extern vchar_t *vmalloc(size_t);
extern vchar_t *vrealloc(vchar_t *, size_t);
extern void vfree(vchar_t *);
extern vchar_t *vdup(vchar_t *);

#endif /* _VMBUF_H */