source: rtems/c/src/lib/libbsp/a29k/portsw/console/console.c @ 8f35817

4.104.114.84.95
Last change on this file since 8f35817 was 8f35817, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 15, 1997 at 6:52:26 PM

eliminated potential for overfilling buffer on read

  • Property mode set to 100644
File size: 5.9 KB
Line 
1/*
2 *  This file contains the template for a console IO package.
3 *
4 *  COPYRIGHT (c) 1989-1997.
5 *  On-Line Applications Research Corporation (OAR).
6 *  Copyright assigned to U.S. Government, 1994.
7 *
8 *  The license and distribution terms for this file may in
9 *  the file LICENSE in this distribution or at
10 *  http://www.OARcorp.com/rtems/license.html.
11 *
12 *  $Id$
13 */
14
15#define NO_BSP_INIT
16
17
18/* only one of the following can be defined */
19#define SERIAL_INPUT  /* use serial input */
20/* #define HIF_INPUT */     /* use HIF input */
21
22#if defined(SERIAL_INPUT) && defined(HIF_INPUT)
23#error SERIAL_INPUT and HIF_INPUT cannot both be defined!!!
24#endif
25
26/* both of the following can be defined */
27#define SERIAL_OUTPUT /* remove to disable serial port console output */
28/* #define HIF_OUTPUT */   /* remove to disable HIF console output */
29
30#include <bsp.h>
31#include <rtems/libio.h>
32#include "serial.h"
33#include "concntl.h"
34
35#ifndef lint
36static char _sccsid[] = "@(#)console.c 09/12/96     1.13\n";
37#endif
38
39/*  console_initialize
40 *
41 *  This routine initializes the console IO driver.
42 *
43 *  Input parameters: NONE
44 *
45 *  Output parameters:  NONE
46 *
47 *  Return values:
48 */
49
50rtems_device_driver console_initialize(
51  rtems_device_major_number  major,
52  rtems_device_minor_number  minor,
53  void                      *arg
54)
55{
56  rtems_status_code status;
57 
58  if ( arg )
59  {
60     if ( console_duartinit(minor,*(unsigned32*)arg) )
61        return RTEMS_INVALID_NUMBER;
62  }
63  else
64  {
65     if ( console_duartinit(1,9600) || console_duartinit(0,9600) )
66     {
67        return RTEMS_INVALID_NUMBER;
68     }
69  }
70 
71  status = rtems_io_register_name(
72    "/dev/console",
73    major,
74    (rtems_device_minor_number) 0
75  );
76 
77  if (status != RTEMS_SUCCESSFUL)
78    rtems_fatal_error_occurred(status);
79 
80  return RTEMS_SUCCESSFUL;
81}
82
83
84/*  is_character_ready
85 *
86 *  This routine returns TRUE if a character is available.
87 *
88 *  Input parameters: NONE
89 *
90 *  Output parameters:  NONE
91 *
92 *  Return values:
93 */
94
95rtems_boolean is_character_ready(
96  char *ch
97)
98{
99  *ch = '\0';   /* return NULL for no particular reason */
100  return(TRUE);
101}
102
103/*  inbyte
104 *
105 *  This routine reads a character from the SOURCE.
106 *
107 *  Input parameters: NONE
108 *
109 *  Output parameters:  NONE
110 *
111 *  Return values:
112 *    character read from SOURCE
113 */
114
115char inbyte( unsigned int minor )
116{
117  /*
118   *  If polling, wait until a character is available.
119   */
120#ifdef HIF_INPUT
121  char retch;
122  _read( 1, &retch, 1 );
123  return retch;
124#endif
125#ifdef SERIAL_INPUT
126  return console_sps_getc( minor );
127#endif
128}
129
130/*  outbyte
131 *
132 *  This routine transmits a character out the SOURCE.  It may support
133 *  XON/XOFF flow control.
134 *
135 *  Input parameters:
136 *    ch  - character to be transmitted
137 *
138 *  Output parameters:  NONE
139 */
140
141void outbyte( unsigned int minor,
142  char ch
143)
144{
145  /*
146   *  If polling, wait for the transmitter to be ready.
147   *  Check for flow control requests and process.
148   *  Then output the character.
149   */
150
151#ifdef SERIAL_OUTPUT
152  console_sps_putc( minor, ch );
153#endif
154
155  /*
156   *  Carriage Return/New line translation.
157   */
158
159  if ( ch == '\n' )
160    outbyte( minor, '\r' );
161}
162
163
164/*
165 *  Open entry point
166 */
167
168rtems_device_driver console_open(
169  rtems_device_major_number major,
170  rtems_device_minor_number minor,
171  void                    * arg
172)
173{
174  return RTEMS_SUCCESSFUL;
175}
176 
177/*
178 *  Close entry point
179 */
180
181rtems_device_driver console_close(
182  rtems_device_major_number major,
183  rtems_device_minor_number minor,
184  void                    * arg
185)
186{
187  return RTEMS_SUCCESSFUL;
188}
189
190/*
191 * read bytes from the serial port. We only have stdin.
192 */
193
194rtems_device_driver console_read(
195  rtems_device_major_number major,
196  rtems_device_minor_number minor,
197  void                    * arg
198)
199{
200  rtems_libio_rw_args_t *rw_args;
201  unsigned8 *buffer;
202  unsigned32 maximum;
203  unsigned32 count = 0;
204 
205  rw_args = (rtems_libio_rw_args_t *) arg;
206
207  buffer = rw_args->buffer;
208  maximum = rw_args->count;
209
210  for (count = 0; count < maximum; count++) {
211    buffer[ count ] = inbyte(minor);
212    if (buffer[ count ] == '\n' || buffer[ count ] == '\r') {
213      buffer[ count++ ]  = '\n';
214      outbyte( minor, '\n' ); /* newline */
215      break;
216    }
217    else if (buffer[ count ] == '\b' && count > 0 )
218    {
219      outbyte( minor, '\b' ); /* move back one space */
220      outbyte( minor, ' ' ); /* erase the character */
221      outbyte( minor, '\b' ); /* move back one space */
222      count-=2;
223    }
224    else
225      outbyte( minor, buffer[ count ] ); /* echo the character */
226  }
227
228  rw_args->bytes_moved = count;
229  return (count > 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
230}
231
232/*
233 * write bytes to the serial port. Stdout and stderr are the same.
234 */
235
236rtems_device_driver console_write(
237  rtems_device_major_number major,
238  rtems_device_minor_number minor,
239  void                    * arg
240)
241{
242  int count;
243  int maximum;
244  rtems_libio_rw_args_t *rw_args;
245  unsigned8 *buffer;
246
247  rw_args = (rtems_libio_rw_args_t *) arg;
248
249  buffer = rw_args->buffer;
250  maximum = rw_args->count;
251
252#ifdef HIF_OUTPUT
253  _write( 0, buffer, maximum );
254#endif
255#ifdef SERIAL_OUTPUT
256  for (count = 0; count < maximum; count++) {
257    if ( buffer[ count ] == '\n') {
258      outbyte(minor,'\r');
259    }
260    outbyte( minor,buffer[ count ] );
261  }
262#endif
263
264  rw_args->bytes_moved = maximum;
265  return 0;
266}
267
268/*
269 *  IO Control entry point
270 */
271
272rtems_device_driver console_control(
273  rtems_device_major_number major,
274  rtems_device_minor_number minor,
275  void                    * arg
276)
277{
278  if (!arg)
279     return RTEMS_INVALID_ADDRESS;
280
281  switch( ((console_ioctl_request_t *)arg)->ioctl_type )
282  {
283     case CON_KBHIT:
284        /* check if keyboard was hit */
285        ((console_ioctl_request_t *)arg)->param = console_sps_kbhit(minor);
286        break;
287
288     case CON_GET_RAW_BYTE:
289        ((console_ioctl_request_t *)arg)->param = inbyte(minor);
290        break;
291
292     case CON_SEND_RAW_BYTE:
293        outbyte(minor, ((console_ioctl_request_t *)arg)->param);
294        break;
295
296     default:
297        break;
298  }
299
300  return RTEMS_SUCCESSFUL;
301}
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