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cirbuf.h

cirbuf.h 1.8 KB
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  1. /* 
    2. 

  2.  * Mach Operating System
    3. 

  3.  * Copyright (c) 1991,1990 Carnegie Mellon University
    4. 

  4.  * All Rights Reserved.
    5. 

  5.  * 
    6. 

  6.  * Permission to use, copy, modify and distribute this software and its
    7. 

  7.  * documentation is hereby granted, provided that both the copyright
    8. 

  8.  * notice and this permission notice appear in all copies of the
    9. 

  9.  * software, derivative works or modified versions, and any portions
    10. 

  10.  * thereof, and that both notices appear in supporting documentation.
    11. 

  11.  * 
    12. 

  12.  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
    13. 

  13.  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
    14. 

  14.  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
    15. 

  15.  * 
    16. 

  16.  * Carnegie Mellon requests users of this software to return to
    17. 

  17.  * 
    18. 

  18.  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
    19. 

  19.  *  School of Computer Science
    20. 

  20.  *  Carnegie Mellon University
    21. 

  21.  *  Pittsburgh PA 15213-3890
    22. 

  22.  * 
    23. 

  23.  * any improvements or extensions that they make and grant Carnegie Mellon
    24. 

  24.  * the rights to redistribute these changes.
    25. 

  25.  */
    26. 

  26. /*
    27. 

  27.  *	Author: David B. Golub, Carnegie Mellon University
    28. 

  28.  *	Date: 	7/90
    29. 

  29.  */
    30. 

  30. 

  31. #ifndef	_DEVICE_CIRBUF_H_
    32. 

  32. #define	_DEVICE_CIRBUF_H_
    33. 

  33. 

  34. /*
    35. 

  35.  * Circular buffers for TTY
    36. 

  36.  */
    37. 

  37. 

  38. struct cirbuf {
    39. 

  39. 	char *	c_start;	/* start of buffer */
    40. 

  40. 	char *	c_end;		/* end of buffer + 1*/
    41. 

  41. 	char *	c_cf;		/* read pointer */
    42. 

  42. 	char *	c_cl;		/* write pointer */
    43. 

  43. 	short	c_cc;		/* current number of characters
    44. 

  44. 				   (compatibility) */
    45. 

  45. 	short	c_hog;		/* max ever */
    46. 

  46. };
    47. 

  47. 

  48. /*
    49. 

  49.  * Exported routines
    50. 

  50.  */
    51. 

  51. extern int	putc(int, struct cirbuf *);
    52. 

  52. extern int	getc(struct cirbuf *);
    53. 

  53. extern int	q_to_b(struct cirbuf *, char *, int);
    54. 

  54. extern int	b_to_q(char *, int, struct cirbuf *);
    55. 

  55. extern void	ndflush(struct cirbuf *, int);
    56. 

  56. extern void	cb_clear(struct cirbuf *);
    57. 

  57. 

  58. extern void	cb_alloc(struct cirbuf *, vm_size_t);
    59. 

  59. extern void	cb_free(struct cirbuf *);
    60. 

  60. 

  61. #endif	/* _DEVICE_CIRBUF_H_ */
    62. 

  62.