cirbuf.h

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * All Rights Reserved.
    5  * 
    6  * Permission to use, copy, modify and distribute this software and its
    7  * documentation is hereby granted, provided that both the copyright
    8  * notice and this permission notice appear in all copies of the
    9  * software, derivative works or modified versions, and any portions
   10  * thereof, and that both notices appear in supporting documentation.
   11  * 
   12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   15  * 
   16  * Carnegie Mellon requests users of this software to return to
   17  * 
   18  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   19  *  School of Computer Science
   20  *  Carnegie Mellon University
   21  *  Pittsburgh PA 15213-3890
   22  * 
   23  * any improvements or extensions that they make and grant Carnegie Mellon
   24  * the rights to redistribute these changes.
   25  */
   26 /*
   27  * HISTORY
   28  * $Log:        cirbuf.h,v $
   29  * Revision 2.6  93/01/14  17:26:37  danner
   30  *      Added function prototypes.  Added cb_clear.
   31  *      [92/11/17            dbg]
   32  *      Added function prototypes.  Added cb_clear.
   33  *      [92/11/17            dbg]
   34  * 
   35  * Revision 2.5  92/05/05  10:46:18  danner
   36  *      Added c_hog.
   37  *      [92/05/04  11:31:37  af]
   38  * 
   39  * Revision 2.4  91/05/14  15:39:43  mrt
   40  *      Correcting copyright
   41  * 
   42  * Revision 2.3  91/02/05  17:08:06  mrt
   43  *      Changed to new Mach copyright
   44  *      [91/01/31  17:26:40  mrt]
   45  * 
   46  * Revision 2.2  90/08/27  21:54:39  dbg
   47  *      Created.
   48  *      [90/07/09            dbg]
   49  * 
   50  */
   51 /*
   52  *      Author: David B. Golub, Carnegie Mellon University
   53  *      Date:   7/90
   54  */
   55 
   56 #ifndef _DEVICE_CIRBUF_H_
   57 #define _DEVICE_CIRBUF_H_
   58 
   59 /*
   60  * Circular buffers for TTY
   61  */
   62 
   63 struct cirbuf {
   64         char *  c_start;        /* start of buffer */
   65         char *  c_end;          /* end of buffer + 1*/
   66         char *  c_cf;           /* read pointer */
   67         char *  c_cl;           /* write pointer */
   68         short   c_cc;           /* current number of characters
   69                                    (compatibility) */
   70         short   c_hog;          /* max ever */
   71 };
   72 
   73 /*
   74  * Exported routines
   75  */
   76 extern int      putc(int, struct cirbuf *);
   77 extern int      getc(struct cirbuf *);
   78 extern int      q_to_b(struct cirbuf *, char *, int);
   79 extern int      b_to_q(char *, int, struct cirbuf *);
   80 extern int      nqdb(struct cirbuf *, int);
   81 extern void     ndflush(struct cirbuf *, int);
   82 extern void     cb_clear(struct cirbuf *);
   83 
   84 extern void     cb_alloc(struct cirbuf *, int);
   85 extern void     cb_free(struct cirbuf *);
   86 
   87 #endif  /* _DEVICE_CIRBUF_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/device/cirbuf.h

FreeBSD/Linux Kernel Cross Reference
sys/device/cirbuf.h