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/*
* IRC - Internet Relay Chat, include/dbuf.h
* Copyright (C) 1990 Markku Savela
* Copyright (C) 1996 - 1997 Carlo Wood
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef DBUF_H
#define DBUF_H
/*
* These structure definitions are only here to be used
* as a whole, *DO NOT EVER REFER TO THESE FIELDS INSIDE
* THE STRUCTURES*! It must be possible to change the internal
* implementation of this package without changing the
* interface.
*/
struct dbuf {
size_t length; /* Current number of bytes stored */
size_t offset; /* Offset to the first byte */
struct dbufbuf *head; /* First data buffer, if length > 0 */
struct dbufbuf *tail; /* last data buffer, if length > 0 */
};
/*
* And this 'dbufbuf' should never be referenced outside the
* implementation of 'dbuf'--would be "hidden" if C had such
* keyword...
* If it was possible, this would compile to be exactly 1 memory
* page in size. 2048 bytes seems to be the most common size, so
* as long as a pointer is 4 bytes, we get 2032 bytes for buffer
* data after we take away a bit for malloc to play with. -avalon
*/
struct dbufbuf {
struct dbufbuf *next; /* Next data buffer, NULL if this is last */
char data[2032]; /* Actual data stored here */
};
/*=============================================================================
* Macro's
*/
/*
* DBufLength
*
* Returns the current number of bytes stored into the buffer.
*/
#define DBufLength(dyn) ((dyn)->length)
/*
* DBufClear
*
* Scratch the current content of the buffer.
* Release all allocated buffers and make it empty.
*/
#define DBufClear(dyn) dbuf_delete((dyn), DBufLength(dyn))
/*=============================================================================
* Proto types
*/
extern void dbuf_delete(dbuf *dyn, size_t length);
extern int dbuf_put(dbuf *dyn, char *buf, size_t length);
extern char *dbuf_map(dbuf *dyn, size_t * length);
extern size_t dbuf_get(dbuf *dyn, char *buf, size_t length);
extern size_t dbuf_getmsg(dbuf *dyn, char *buf, size_t length);
extern unsigned int dbufalloc, dbufblocks;
#endif /* DBUF_H */
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