1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
4 *
5 * Permission is hereby granted, free of charge, to any person
6 * obtaining a copy of this software and associated documentation
7 * files (the "Software"), to deal in the Software without
8 * restriction, including without limitation the rights to use,
9 * copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom
11 * the Software is furnished to do so, subject to the following
12 * conditions:
13 *
14 * The above copyright notice and this permission notice shall
15 * be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 *
26 * ----------------------------------------------------------------------- */
27
28 /*
29 * rawcon_read.c
30 *
31 * Character-oriented reading from the console without echo;
32 * this is a NONBLOCKING device.
33 */
34
35 #include <errno.h>
36 #include <string.h>
37 #include <com32.h>
38 #include <core.h>
39 #include <minmax.h>
40 #include "file.h"
41
42 /* Global, since it's used by stdcon_read */
__rawcon_read(struct file_info * fp,void * buf,size_t count)43 ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count)
44 {
45 char *bufp = buf;
46 size_t n = 0;
47 static char hi = 0;
48 static bool hi_key = false;
49
50 (void)fp;
51
52 while (n < count) {
53 if (hi_key) {
54 *bufp++ = hi;
55 n++;
56 hi_key = false;
57 continue;
58 }
59
60 /* Poll */
61 if (!pollchar())
62 break;
63
64 /* We have data, go get it */
65 *bufp = getchar(&hi);
66 if (!*bufp)
67 hi_key = true;
68
69 bufp++;
70 n++;
71 }
72
73 return n;
74 }
75
76 const struct input_dev dev_rawcon_r = {
77 .dev_magic = __DEV_MAGIC,
78 .flags = __DEV_TTY | __DEV_INPUT,
79 .fileflags = O_RDONLY,
80 .read = __rawcon_read,
81 .close = NULL,
82 .open = NULL,
83 };
84