aboutsummaryrefslogtreecommitdiffstats
path: root/com32/lib/sys/ansi.c
blob: 17ace1d4fa7ff99d9cae513fcb3f4423dc03f62e (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
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2004-2008 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.
 *
 * ----------------------------------------------------------------------- */

/*
 * ansi.c
 *
 * ANSI character code engine
 */

#include <string.h>
#include <colortbl.h>
#include "ansi.h"

static const struct term_state default_state = {
    .state = st_init,
    .pvt = false,
    .nparms = 0,
    .xy = {0, 0},
    .cindex = 0,		/* First color table entry */
    .vtgraphics = false,
    .intensity = 1,
    .underline = false,
    .blink = false,
    .reverse = false,
    .fg = 7,
    .bg = 0,
    .autocr = true,	  	/* Mimic \n -> \r\n conversion by default */
    .autowrap = true,		/* Wrap lines by default */
    .saved_xy = {0, 0},
    .cursor = true,
};

/* DEC VT graphics to codepage 437 table (characters 0x60-0x7F only) */
static const char decvt_to_cp437[] = {
    0004, 0261, 0007, 0007, 0007, 0007, 0370, 0361,
    0007, 0007, 0331, 0277, 0332, 0300, 0305, 0304,
    0304, 0304, 0137, 0137, 0303, 0264, 0301, 0302,
    0263, 0363, 0362, 0343, 0330, 0234, 0007, 00
};

void __ansi_init(const struct term_info *ti)
{
    memcpy(ti->ts, &default_state, sizeof default_state);
}

void __ansi_putchar(const struct term_info *ti, uint8_t ch)
{
    const struct ansi_ops *op = ti->op;
    struct term_state *st = ti->ts;
    const int rows = ti->rows;
    const int cols = ti->cols;
    struct curxy xy = st->xy;

    switch (st->state) {
    case st_init:
	switch (ch) {
	case 1 ... 5:
	    st->state = st_tbl;
	    st->parms[0] = ch;
	    break;
	case '\a':
	    op->beep();
	    break;
	case '\b':
	    if (xy.x > 0)
		xy.x--;
	    break;
	case '\t':
	    {
		int nsp = 8 - (xy.x & 7);
		while (nsp--)
		    __ansi_putchar(ti, ' ');
	    }
	    return;		/* Cursor already updated */
	case '\n':
	case '\v':
	case '\f':
	    xy.y++;
	    if (st->autocr)
		xy.x = 0;
	    break;
	case '\r':
	    xy.x = 0;
	    break;
	case 127:
	    /* Ignore delete */
	    break;
	case 14:
	    st->vtgraphics = 1;
	    break;
	case 15:
	    st->vtgraphics = 0;
	    break;
	case 27:
	    st->state = st_esc;
	    break;
	default:
	    /* Print character */
	    if (ch >= 32) {
		if (st->vtgraphics && (ch & 0xe0) == 0x60)
		    ch = decvt_to_cp437[ch - 0x60];

		op->write_char(xy.x, xy.y, BIOS_PAGE, ch, st);
		xy.x++;
	    }
	    break;
	}
	break;

    case st_esc:
	switch (ch) {
	case '%':
	case '(':
	case ')':
	case '#':
	    /* Ignore this plus the subsequent character, allows
	       compatibility with Linux sequence to set charset */
	    break;
	case '[':
	    st->state = st_csi;
	    st->nparms = 0;
	    st->pvt = false;
	    memset(st->parms, 0, sizeof st->parms);
	    break;
	case 'c':
	    /* Reset terminal */
	    memcpy(&st, &default_state, sizeof st);
	    op->erase(st, 0, 0, cols - 1, rows - 1);
	    xy.x = xy.y = 0;
	    st->state = st_init;
	    break;
	default:
	    /* Ignore sequence */
	    st->state = st_init;
	    break;
	}
	break;

    case st_csi:
	{
	    int p0 = st->parms[0] ? st->parms[0] : 1;

	    if (ch >= '0' && ch <= '9') {
		st->parms[st->nparms] = st->parms[st->nparms] * 10 + (ch - '0');
	    } else if (ch == ';') {
		st->nparms++;
		if (st->nparms >= ANSI_MAX_PARMS)
		    st->nparms = ANSI_MAX_PARMS - 1;
		break;
	    } else if (ch == '?') {
		st->pvt = true;
	    } else {
		switch (ch) {
		case 'A':
		    {
			int y = xy.y - p0;
			xy.y = (y < 0) ? 0 : y;
		    }
		    break;
		case 'B':
		    {
			int y = xy.y + p0;
			xy.y = (y >= rows) ? rows - 1 : y;
		    }
		    break;
		case 'C':
		    {
			int x = xy.x + p0;
			xy.x = (x >= cols) ? cols - 1 : x;
		    }
		    break;
		case 'D':
		    {
			int x = xy.x - p0;
			xy.x = (x < 0) ? 0 : x;
		    }
		    break;
		case 'E':
		    {
			int y = xy.y + p0;
			xy.y = (y >= rows) ? rows - 1 : y;
			xy.x = 0;
		    }
		    break;
		case 'F':
		    {
			int y = xy.y - p0;
			xy.y = (y < 0) ? 0 : y;
			xy.x = 0;
		    }
		    break;
		case 'G':
		case '\'':
		    {
			int x = st->parms[0] - 1;
			xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x;
		    }
		    break;
		case 'H':
		case 'f':
		    {
			int y = st->parms[0] - 1;
			int x = st->parms[1] - 1;

			xy.x = (x >= cols) ? cols - 1 : (x < 0) ? 0 : x;
			xy.y = (y >= rows) ? rows - 1 : (y < 0) ? 0 : y;
		    }
		    break;
		case 'J':
		    {
			switch (st->parms[0]) {
			case 0:
			    op->erase(st, xy.x, xy.y, cols - 1, xy.y);
			    if (xy.y < rows - 1)
				op->erase(st, 0, xy.y + 1, cols - 1, rows - 1);
			    break;

			case 1:
			    if (xy.y > 0)
				op->erase(st, 0, 0, cols - 1, xy.y - 1);
			    if (xy.y > 0)
				op->erase(st, 0, xy.y, xy.x - 1, xy.y);
			    break;

			case 2:
			    op->erase(st, 0, 0, cols - 1, rows - 1);
			    break;

			default:
			    /* Ignore */
			    break;
			}
		    }
		    break;
		case 'K':
		    {
			switch (st->parms[0]) {
			case 0:
			    op->erase(st, xy.x, xy.y, cols - 1, xy.y);
			    break;

			case 1:
			    if (xy.x > 0)
				op->erase(st, 0, xy.y, xy.x - 1, xy.y);
			    break;

			case 2:
			    op->erase(st, 0, xy.y, cols - 1, xy.y);
			    break;

			default:
			    /* Ignore */
			    break;
			}
		    }
		    break;
		case 'h':
		case 'l':
		{
		    bool set = (ch == 'h');
		    switch (st->parms[0]) {
		    case 7:	/* DECAWM */
			st->autowrap = set;
			break;
		    case 20:	/* LNM */
			st->autocr = set;
			break;
		    case 25:	/* DECTECM */
			st->cursor = set;
			op->showcursor(st);
			break;
		    default:
			/* Ignore */
			break;
		    }
		    break;
		}
		case 'm':
		    {
			static const int ansi2pc[8] =
			    { 0, 4, 2, 6, 1, 5, 3, 7 };

			int i;
			for (i = 0; i <= st->nparms; i++) {
			    int a = st->parms[i];
			    switch (a) {
			    case 0:
				st->fg = 7;
				st->bg = 0;
				st->intensity = 1;
				st->underline = 0;
				st->blink = 0;
				st->reverse = 0;
				break;
			    case 1:
				st->intensity = 2;
				break;
			    case 2:
				st->intensity = 0;
				break;
			    case 4:
				st->underline = 1;
				break;
			    case 5:
				st->blink = 1;
				break;
			    case 7:
				st->reverse = 1;
				break;
			    case 21:
			    case 22:
				st->intensity = 1;
				break;
			    case 24:
				st->underline = 0;
				break;
			    case 25:
				st->blink = 0;
				break;
			    case 27:
				st->reverse = 0;
				break;
			    case 30 ... 37:
				st->fg = ansi2pc[a - 30];
				break;
			    case 38:
				st->fg = 7;
				st->underline = 1;
				break;
			    case 39:
				st->fg = 7;
				st->underline = 0;
				break;
			    case 40 ... 47:
				st->bg = ansi2pc[a - 40];
				break;
			    case 49:
				st->bg = 7;
				break;
			    default:
				/* Do nothing */
				break;
			    }
			}
		    }
		    break;
		case 's':
		    st->saved_xy = xy;
		    break;
		case 'u':
		    xy = st->saved_xy;
		    break;
		default:	/* Includes CAN and SUB */
		    break;	/* Drop unknown sequence */
		}
		st->state = st_init;
	    }
	}
	break;

    case st_tbl:
	st->parms[1] = 0;
	if (ch == '#')
	    st->state = st_tblc;
	else
	    st->state = st_init;
	break;

    case st_tblc:
	{
	    unsigned int n = (unsigned char)ch - '0';
	    const char *p;

	    if (n < 10) {
		st->parms[1] = st->parms[1] * 10 + n;

		if (!--st->parms[0]) {
		    if (st->parms[1] < console_color_table_size) {
			/* Set the color table index */
			st->cindex = st->parms[1];

			/* See if there are any other attributes we care about */
			p = console_color_table[st->parms[1]].ansi;
			if (p) {
			    st->state = st_esc;
			    __ansi_putchar(ti, '[');
			    __ansi_putchar(ti, '0');
			    __ansi_putchar(ti, ';');
			    while (*p)
				__ansi_putchar(ti, *p++);
			    __ansi_putchar(ti, 'm');
			}
		    }
		    st->state = st_init;
		}
	    } else {
		st->state = st_init;
	    }
	}
	break;
    }

    /* If we fell off the end of the screen, adjust */
    if (xy.x >= cols) {
	if (st->autowrap) {
	    xy.x = 0;
	    xy.y++;
	} else {
	    xy.x = cols - 1;
	}
    }
    while (xy.y >= rows) {
	xy.y--;
	op->scroll_up(st);
    }

    /* Update cursor position */
    op->set_cursor(xy.x, xy.y, BIOS_PAGE, st->cursor);
    st->xy = xy;
}