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 * stdcon_read.c
30 *
31 * Line-oriented reading from the standard console
32 */
33
34 #include <errno.h>
35 #include <string.h>
36 #include <com32.h>
37 #include <minmax.h>
38 #include "file.h"
39
40 extern ssize_t __rawcon_read(struct file_info *fp, void *buf, size_t count);
41
__stdcon_read(struct file_info * fp,void * buf,size_t count)42 static ssize_t __stdcon_read(struct file_info *fp, void *buf, size_t count)
43 {
44 char *bufp = buf;
45 size_t n = 0;
46 char ch;
47
48 (void)fp;
49
50 while (n < count) {
51 if (fp->i.nbytes) {
52 ch = *bufp++ = *fp->i.datap++;
53 fp->i.nbytes--;
54 n++;
55 if (ch == '\n')
56 return n;
57 } else {
58 fp->i.nbytes = __line_input(fp, fp->i.buf, MAXBLOCK, __rawcon_read);
59 fp->i.datap = fp->i.buf;
60
61 if (fp->i.nbytes == 0)
62 return n;
63 }
64 }
65
66 return n;
67 }
68
69 const struct input_dev dev_stdcon_r = {
70 .dev_magic = __DEV_MAGIC,
71 .flags = __DEV_TTY | __DEV_INPUT,
72 .fileflags = O_RDONLY,
73 .read = __stdcon_read,
74 .close = NULL,
75 .open = NULL,
76 };
77