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Annotation of 43BSDReno/usr.bin/telnet/ring.h, revision 1.1.1.1

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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