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