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Annotation of 43BSDReno/usr.bin/telnet/ring.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  *
        !            19:  *     @(#)ring.h      1.10 (Berkeley) 6/28/90
        !            20:  */
        !            21: 
        !            22: /*
        !            23:  * This defines a structure for a ring buffer.
        !            24:  *
        !            25:  * The circular buffer has two parts:
        !            26:  *(((
        !            27:  *     full:   [consume, supply)
        !            28:  *     empty:  [supply, consume)
        !            29:  *]]]
        !            30:  *
        !            31:  */
        !            32: typedef struct {
        !            33:     char       *consume,       /* where data comes out of */
        !            34:                *supply,        /* where data comes in to */
        !            35:                *bottom,        /* lowest address in buffer */
        !            36:                *top,           /* highest address+1 in buffer */
        !            37:                *mark;          /* marker (user defined) */
        !            38:     int                size;           /* size in bytes of buffer */
        !            39:     u_long     consumetime,    /* help us keep straight full, empty, etc. */
        !            40:                supplytime;
        !            41: } Ring;
        !            42: 
        !            43: /* Here are some functions and macros to deal with the ring buffer */
        !            44: 
        !            45: 
        !            46: #if    defined(LINT_ARGS)
        !            47: 
        !            48: /* Initialization routine */
        !            49: extern int
        !            50:        ring_init(Ring *ring, char *buffer, int count);
        !            51: 
        !            52: /* Data movement routines */
        !            53: extern void
        !            54:        ring_supply_data(Ring *ring, char *buffer, int count);
        !            55: #ifdef notdef
        !            56: extern void
        !            57:        ring_consume_data(Ring *ring, char *buffer, int count);
        !            58: #endif
        !            59: 
        !            60: /* Buffer state transition routines */
        !            61: extern void
        !            62:        ring_supplied(Ring *ring, int count),
        !            63:        ring_consumed(Ring *ring, int count);
        !            64: 
        !            65: /* Buffer state query routines */
        !            66: extern int
        !            67:        ring_empty_count(Ring *ring),
        !            68:        ring_empty_consecutive(Ring *ring),
        !            69:        ring_full_count(Ring *ring),
        !            70:        ring_full_consecutive(Ring *ring);
        !            71: 
        !            72: #else /* LINT_ARGS */
        !            73: extern int
        !            74:        ring_init();
        !            75: 
        !            76: extern void
        !            77:     ring_supply_data();
        !            78: #ifdef notdef
        !            79: extern void
        !            80:     ring_consume_data();
        !            81: #endif
        !            82: 
        !            83: extern void
        !            84:     ring_supplied(),
        !            85:     ring_consumed();
        !            86: 
        !            87: extern void
        !            88:     ring_clear_mark(),
        !            89:     ring_mark();
        !            90: 
        !            91: extern int
        !            92:     ring_empty_count(),
        !            93:     ring_empty_consecutive(),
        !            94:     ring_full_count(),
        !            95:     ring_full_consecutive();
        !            96: #endif /* defined(LINT_ARGS) */

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