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Annotation of Gnu-Mach/device/cirbuf.h, revision 1.1.1.1

1.1       root        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  [email protected]
                     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:  *     Author: David B. Golub, Carnegie Mellon University
                     28:  *     Date:   7/90
                     29:  */
                     30: 
                     31: #ifndef        _DEVICE_CIRBUF_H_
                     32: #define        _DEVICE_CIRBUF_H_
                     33: 
                     34: /*
                     35:  * Circular buffers for TTY
                     36:  */
                     37: 
                     38: struct cirbuf {
                     39:        char *  c_start;        /* start of buffer */
                     40:        char *  c_end;          /* end of buffer + 1*/
                     41:        char *  c_cf;           /* read pointer */
                     42:        char *  c_cl;           /* write pointer */
                     43:        short   c_cc;           /* current number of characters
                     44:                                   (compatibility) */
                     45:        short   c_hog;          /* max ever */
                     46: };
                     47: 
                     48: /*
                     49:  * Exported routines
                     50:  */
                     51: extern int     putc(int, struct cirbuf *);
                     52: extern int     getc(struct cirbuf *);
                     53: extern int     q_to_b(struct cirbuf *, char *, int);
                     54: extern int     b_to_q(char *, int, struct cirbuf *);
                     55: extern int     nqdb(struct cirbuf *, int);
                     56: extern void    ndflush(struct cirbuf *, int);
                     57: extern void    cb_clear(struct cirbuf *);
                     58: 
                     59: extern void    cb_alloc(struct cirbuf *, int);
                     60: extern void    cb_free(struct cirbuf *);
                     61: 
                     62: #endif /* _DEVICE_CIRBUF_H_ */

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