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_write.c
30 *
31 * Writing to the console; \n -> \r\n conversion.
32 */
33
34#include <errno.h>
35#include <string.h>
36#include <com32.h>
37#include <core.h>
38#include <minmax.h>
39#include "file.h"
40
41#define BIOS_ROWS (*(uint8_t *)0x484)	/* Minus one; if zero use 24 (= 25 lines) */
42#define BIOS_COLS (*(uint16_t *)0x44A)
43
44static int __stdcon_open(struct file_info *fp)
45{
46    fp->o.rows = BIOS_ROWS + 1;
47    fp->o.cols = BIOS_COLS;
48
49    /* Sanity check */
50    if (fp->o.rows < 12)
51	fp->o.rows = 24;
52    if (fp->o.cols < 40)
53	fp->o.cols = 80;
54
55    return 0;
56}
57
58static ssize_t __stdcon_write(struct file_info *fp, const void *buf,
59			      size_t count)
60{
61    const char *bufp = buf;
62    size_t n = 0;
63
64    (void)fp;
65
66    while (count--) {
67	if (*bufp == '\n')
68	    writechr('\r');
69
70	writechr(*bufp++);
71	n++;
72    }
73
74    return n;
75}
76
77const struct output_dev dev_stdcon_w = {
78    .dev_magic = __DEV_MAGIC,
79    .flags = __DEV_TTY | __DEV_OUTPUT,
80    .fileflags = O_WRONLY | O_CREAT | O_TRUNC | O_APPEND,
81    .write = __stdcon_write,
82    .close = NULL,
83    .open  = __stdcon_open,
84};
85