aboutsummaryrefslogtreecommitdiffstats
path: root/com32/lib/sys/vesacon_write.c
blob: 9767a62112d0b16990b14fc3f5d09de126975da7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2004-2009 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------- */

/*
 * vesacon_write.c
 *
 * Write to the screen using ANSI control codes (about as capable as
 * DOS' ANSI.SYS.)
 */

#include <errno.h>
#include <string.h>
#include <com32.h>
#include <minmax.h>
#include <colortbl.h>
#include <console.h>
#include <klibc/compiler.h>
#include <syslinux/config.h>
#include "ansi.h"
#include "file.h"
#include "vesa/video.h"

static void vesacon_erase(const struct term_state *, int, int, int, int);
static void vesacon_write_char(int, int, uint8_t, const struct term_state *);
static void vesacon_showcursor(const struct term_state *);
static void vesacon_scroll_up(const struct term_state *);

static struct term_state ts;
static struct ansi_ops op = {
  .erase	= vesacon_erase,
  .write_char	= vesacon_write_char,
  .showcursor   = vesacon_showcursor,
  .set_cursor   = __vesacon_set_cursor,	/* in drawtxt.c */
  .scroll_up    = vesacon_scroll_up,
  .beep		= __ansicon_beep,
};

static struct term_info ti =
  {
    .cols = TEXT_PIXEL_COLS/FONT_WIDTH,
    .disabled = 0,
    .ts = &ts,
    .op = &op
  };

/* Reference counter to the screen, to keep track of if we need
   reinitialization. */
static int vesacon_counter = 0;

/* Common setup */
int __vesacon_open(struct file_info *fp)
{
  static com32sys_t ireg;	/* Auto-initalized to all zero */
  com32sys_t oreg;

  (void)fp;

  if (!vesacon_counter) {
    /* Are we disabled? */
    if (syslinux_serial_console_info()->flowctl & 0x8000) {
      ti.disabled = 1;
      ti.rows = 25;
      ti.cols = 80;
    } else {
      /* Switch mode */
      if (__vesacon_init()) {
	vesacon_counter = -1;
	return EAGAIN;
      }

      /* Initial state */
      __ansi_init(&ti);
      ti.rows = __vesacon_text_rows;
    }
  } else if (vesacon_counter == -1) {
    return EAGAIN;
  }

  fp->o.rows = ti.rows;
  fp->o.cols = ti.cols;

  vesacon_counter++;
  return 0;
}

int __vesacon_close(struct file_info *fp)
{
  (void)fp;

  vesacon_counter--;
  return 0;
}

/* Erase a region of the screen */
static void vesacon_erase(const struct term_state *st,
			  int x0, int y0, int x1, int y1)
{
  __vesacon_erase(x0, y0, x1, y1, st->cindex);
}

/* Draw text on the screen */
static void vesacon_write_char(int x, int y, uint8_t ch,
			       const struct term_state *st)
{
  __vesacon_write_char(x, y, ch, st->cindex);
}

/* Show or hide the cursor */
static void vesacon_showcursor(const struct term_state *st)
{
  __vesacon_set_cursor(st->xy.x, st->xy.y, st->cursor);
}

static void vesacon_scroll_up(const struct term_state *st)
{
  __vesacon_scroll_up(1, st->cindex);
}

ssize_t __vesacon_write(struct file_info *fp, const void *buf, size_t count)
{
  const unsigned char *bufp = buf;
  size_t n = 0;

  (void)fp;

  if ( ti.disabled )
    return count;		/* Nothing to do */

  /* This only updates the shadow text buffer... */
  while ( count-- ) {
    __ansi_putchar(&ti, *bufp++);
    n++;
  }

  /* This actually draws it */
  __vesacon_doit();

  return n;
}

const struct output_dev dev_vesacon_w = {
  .dev_magic  = __DEV_MAGIC,
  .flags      = __DEV_TTY | __DEV_OUTPUT,
  .fileflags  = O_WRONLY | O_CREAT | O_TRUNC | O_APPEND,
  .write      = __vesacon_write,
  .close      = __vesacon_close,
  .open       = __vesacon_open,
  .fallback   = &dev_ansicon_w,
};