aboutsummaryrefslogtreecommitdiff
path: root/driver-csi.c
blob: a8ae0c04f3a0b4ac19985f98209ba0d3257fcb1c (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
445
446
447
448
449
450
451
452
453
454
455
#include "termkey.h"
#include "termkey-internal.h"

#include <stdio.h>
#include <string.h>

// There are 64 codes 0x40 - 0x7F
static int keyinfo_initialised = 0;
static struct keyinfo csi_ss3s[64];
static struct keyinfo ss3s[64];
static char ss3_kpalts[64];
static struct keyinfo csifuncs[35]; /* This value must be increased if more CSI function keys are added */
#define NCSIFUNCS (sizeof(csifuncs)/sizeof(csifuncs[0]))

typedef struct {
  TermKey *tk;
} TermKeyCsi;

static void register_csi_ss3_full(TermKeyType type, TermKeySym sym, int modifier_set, int modifier_mask, unsigned char cmd)
{
  if(cmd < 0x40 || cmd >= 0x80) {
    return;
  }

  csi_ss3s[cmd - 0x40].type = type;
  csi_ss3s[cmd - 0x40].sym = sym;
  csi_ss3s[cmd - 0x40].modifier_set = modifier_set;
  csi_ss3s[cmd - 0x40].modifier_mask = modifier_mask;
}

static void register_csi_ss3(TermKeyType type, TermKeySym sym, unsigned char cmd)
{
  register_csi_ss3_full(type, sym, 0, 0, cmd);
}

static void register_ss3kpalt(TermKeyType type, TermKeySym sym, unsigned char cmd, char kpalt)
{
  if(cmd < 0x40 || cmd >= 0x80) {
    return;
  }

  ss3s[cmd - 0x40].type = type;
  ss3s[cmd - 0x40].sym = sym;
  ss3s[cmd - 0x40].modifier_set = 0;
  ss3s[cmd - 0x40].modifier_mask = 0;
  ss3_kpalts[cmd - 0x40] = kpalt;
}

static void register_csifunc(TermKeyType type, TermKeySym sym, int number)
{
  if(number >= NCSIFUNCS) {
    return;
  }

  csifuncs[number].type = type;
  csifuncs[number].sym = sym;
  csifuncs[number].modifier_set = 0;
  csifuncs[number].modifier_mask = 0;
}

static int register_keys(void)
{
  int i;

  for(i = 0; i < 64; i++) {
    csi_ss3s[i].sym = TERMKEY_SYM_UNKNOWN;
    ss3s[i].sym     = TERMKEY_SYM_UNKNOWN;
    ss3_kpalts[i] = 0;
  }

  for(i = 0; i < NCSIFUNCS; i++)
    csifuncs[i].sym = TERMKEY_SYM_UNKNOWN;

  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_UP,    'A');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_DOWN,  'B');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_RIGHT, 'C');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_LEFT,  'D');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_BEGIN, 'E');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_END,   'F');
  register_csi_ss3(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_HOME,  'H');
  register_csi_ss3(TERMKEY_TYPE_FUNCTION, 1, 'P');
  register_csi_ss3(TERMKEY_TYPE_FUNCTION, 2, 'Q');
  register_csi_ss3(TERMKEY_TYPE_FUNCTION, 3, 'R');
  register_csi_ss3(TERMKEY_TYPE_FUNCTION, 4, 'S');

  register_csi_ss3_full(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_TAB, TERMKEY_KEYMOD_SHIFT, TERMKEY_KEYMOD_SHIFT, 'Z');

  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPENTER,  'M', 0);
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPEQUALS, 'X', '=');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPMULT,   'j', '*');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPPLUS,   'k', '+');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPCOMMA,  'l', ',');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPMINUS,  'm', '-');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPPERIOD, 'n', '.');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KPDIV,    'o', '/');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP0,      'p', '0');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP1,      'q', '1');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP2,      'r', '2');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP3,      's', '3');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP4,      't', '4');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP5,      'u', '5');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP6,      'v', '6');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP7,      'w', '7');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP8,      'x', '8');
  register_ss3kpalt(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_KP9,      'y', '9');

  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_FIND,      1);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_INSERT,    2);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_DELETE,    3);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_SELECT,    4);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEUP,    5);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_PAGEDOWN,  6);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_HOME,      7);
  register_csifunc(TERMKEY_TYPE_KEYSYM, TERMKEY_SYM_END,       8);

  register_csifunc(TERMKEY_TYPE_FUNCTION, 1,  11);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 2,  12);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 3,  13);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 4,  14);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 5,  15);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 6,  17);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 7,  18);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 8,  19);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 9,  20);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 10, 21);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 11, 23);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 12, 24);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 13, 25);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 14, 26);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 15, 28);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 16, 29);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 17, 31);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 18, 32);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 19, 33);
  register_csifunc(TERMKEY_TYPE_FUNCTION, 20, 34);

  keyinfo_initialised = 1;
  return 1;
}

static void *new_driver(TermKey *tk, const char *term)
{
  if(strncmp(term, "xterm", 5) == 0) {
    // We want "xterm" or "xtermc" or "xterm-..."
    if(term[5] != 0 && term[5] != '-' && term[5] != 'c')
      return NULL;
  }
  else if(strcmp(term, "screen") == 0) {
    /* Also apply for screen, because it might be transporting xterm-like
     * sequences. Yes, this sucks. We shouldn't need to rely on this behaviour
     * but there's no other way to know, and if we don't then we won't
     * recognise its sequences.
     */
  }
  else
    return NULL;

  // Excellent - we'll continue

  if(!keyinfo_initialised)
    if(!register_keys())
      return NULL;

  TermKeyCsi *csi = malloc(sizeof *csi);
  if(!csi)
    return NULL;

  csi->tk = tk;

  return csi;
}

static void free_driver(void *info)
{
  TermKeyCsi *csi = info;

  free(csi);
}

#define CHARAT(i) (tk->buffer[tk->buffstart + (i)])

static TermKeyResult peekkey_csi(TermKey *tk, TermKeyCsi *csi, size_t introlen, TermKeyKey *key, int force, size_t *nbytep)
{
  size_t csi_end = introlen;

  while(csi_end < tk->buffcount) {
    if(CHARAT(csi_end) >= 0x40 && CHARAT(csi_end) < 0x80)
      break;
    csi_end++;
  }

  if(csi_end >= tk->buffcount) {
    if(!force)
      return TERMKEY_RES_AGAIN;

    (*tk->method.emit_codepoint)(tk, '[', key);
    key->modifiers |= TERMKEY_KEYMOD_ALT;
    *nbytep = introlen;
    return TERMKEY_RES_KEY;
  }

  unsigned char cmd = CHARAT(csi_end);
  long arg[16];
  char present = 0;
  int args = 0;
  int initial = 0;

  size_t p = introlen;

  // See if there is an initial byte
  if(CHARAT(p) >= '<' && CHARAT(p) <= '?') {
    initial = CHARAT(p);
    p++;
  }

  // Now attempt to parse out up number;number;... separated values
  while(p < csi_end) {
    unsigned char c = CHARAT(p);

    if(c >= '0' && c <= '9') {
      if(!present) {
        arg[args] = c - '0';
        present = 1;
      }
      else {
        arg[args] = (arg[args] * 10) + c - '0';
      }
    }
    else if(c == ';') {
      if(!present)
        arg[args] = -1;
      present = 0;
      args++;

      if(args > 16)
        break;
    }

    p++;
  }

  if(!present)
    arg[args] = -1;

  args++;

  if(args > 1 && arg[1] != -1)
    key->modifiers = arg[1] - 1;
  else
    key->modifiers = 0;

  if(cmd == '~') {
    key->type = TERMKEY_TYPE_KEYSYM;

    if(arg[0] == 27) {
      int mod = key->modifiers;
      (*tk->method.emit_codepoint)(tk, arg[2], key);
      key->modifiers |= mod;
    }
    else if(arg[0] >= 0 && arg[0] < NCSIFUNCS) {
      key->type = csifuncs[arg[0]].type;
      key->code.sym = csifuncs[arg[0]].sym;
      key->modifiers &= ~(csifuncs[arg[0]].modifier_mask);
      key->modifiers |= csifuncs[arg[0]].modifier_set;
    }
    else
      key->code.sym = TERMKEY_SYM_UNKNOWN;

    if(key->code.sym == TERMKEY_SYM_UNKNOWN) {
#ifdef DEBUG
      fprintf(stderr, "CSI: Unknown function key %ld\n", arg[0]);
#endif
      return TERMKEY_RES_NONE;
    }
  }
  else if(cmd == 'u') {
    int mod = key->modifiers;
    key->type = TERMKEY_TYPE_KEYSYM;
    (*tk->method.emit_codepoint)(tk, arg[0], key);
    key->modifiers |= mod;
  }
  else if(cmd == 'M' || (initial == '<' && cmd == 'm')) {
    size_t csi_len = csi_end + 1;

    if(!initial && args >= 3) { // rxvt protocol
      key->code.mouse[0] = arg[0];

      key->modifiers     = (key->code.mouse[0] & 0x1c) >> 2;
      key->code.mouse[0] &= ~0x1c;

      if(arg[1] > 0xff)
        key->code.mouse[1] = 0xff;
      else
        key->code.mouse[1] = arg[1];

      if(arg[2] > 0xff)
        key->code.mouse[2] = 0xff;
      else
        key->code.mouse[2] = arg[2];

      *nbytep = csi_len;
      return TERMKEY_RES_KEY;
    }

    if(initial == '<' && args >= 3) { // SGR protocol
      key->code.mouse[0] = arg[0];

      key->modifiers     = (key->code.mouse[0] & 0x1c) >> 2;
      key->code.mouse[0] &= ~0x1c;

      if(arg[1] > 0xff)
        key->code.mouse[1] = 0xff;
      else
        key->code.mouse[1] = arg[1];

      if(arg[2] > 0xff)
        key->code.mouse[2] = 0xff;
      else
        key->code.mouse[2] = arg[2];

      key->code.mouse[3] = (cmd == 'm');

      *nbytep = csi_len;
      return TERMKEY_RES_KEY;
    }

    tk->buffstart += csi_len;
    tk->buffcount -= csi_len;

    TermKeyResult mouse_result = (*tk->method.peekkey_mouse)(tk, key, nbytep);

    tk->buffstart -= csi_len;
    tk->buffcount += csi_len;

    if(mouse_result == TERMKEY_RES_KEY)
      *nbytep += csi_len;

    return mouse_result;
  }
  else {
    // We know from the logic above that cmd must be >= 0x40 and < 0x80
    key->type = csi_ss3s[cmd - 0x40].type;
    key->code.sym = csi_ss3s[cmd - 0x40].sym;
    key->modifiers &= ~(csi_ss3s[cmd - 0x40].modifier_mask);
    key->modifiers |= csi_ss3s[cmd - 0x40].modifier_set;

    if(key->code.sym == TERMKEY_SYM_UNKNOWN) {
#ifdef DEBUG
      switch(args) {
      case 1:
        fprintf(stderr, "CSI: Unknown arg1=%ld cmd=%c\n", arg[0], (char)cmd);
        break;
      case 2:
        fprintf(stderr, "CSI: Unknown arg1=%ld arg2=%ld cmd=%c\n", arg[0], arg[1], (char)cmd);
        break;
      case 3:
        fprintf(stderr, "CSI: Unknown arg1=%ld arg2=%ld arg3=%ld cmd=%c\n", arg[0], arg[1], arg[2], (char)cmd);
        break;
      default:
        fprintf(stderr, "CSI: Unknown arg1=%ld arg2=%ld arg3=%ld ... args=%d cmd=%c\n", arg[0], arg[1], arg[2], args, (char)cmd);
        break;
      }
#endif
      return TERMKEY_RES_NONE;
    }
  }

  *nbytep = csi_end + 1;

  return TERMKEY_RES_KEY;
}

static TermKeyResult peekkey_ss3(TermKey *tk, TermKeyCsi *csi, size_t introlen, TermKeyKey *key, int force, size_t *nbytep)
{
  if(tk->buffcount < introlen + 1) {
    if(!force)
      return TERMKEY_RES_AGAIN;

    (*tk->method.emit_codepoint)(tk, 'O', key);
    key->modifiers |= TERMKEY_KEYMOD_ALT;
    *nbytep = tk->buffcount;
    return TERMKEY_RES_KEY;
  }

  unsigned char cmd = CHARAT(introlen);

  if(cmd < 0x40 || cmd >= 0x80)
    return TERMKEY_RES_NONE;

  key->type = csi_ss3s[cmd - 0x40].type;
  key->code.sym = csi_ss3s[cmd - 0x40].sym;
  key->modifiers = csi_ss3s[cmd - 0x40].modifier_set;

  if(key->code.sym == TERMKEY_SYM_UNKNOWN) {
    if(tk->flags & TERMKEY_FLAG_CONVERTKP && ss3_kpalts[cmd - 0x40]) {
      key->type = TERMKEY_TYPE_UNICODE;
      key->code.codepoint = ss3_kpalts[cmd - 0x40];
      key->modifiers = 0;

      key->utf8[0] = key->code.codepoint;
      key->utf8[1] = 0;
    }
    else {
      key->type = ss3s[cmd - 0x40].type;
      key->code.sym = ss3s[cmd - 0x40].sym;
      key->modifiers = ss3s[cmd - 0x40].modifier_set;
    }
  }

  if(key->code.sym == TERMKEY_SYM_UNKNOWN) {
#ifdef DEBUG
    fprintf(stderr, "CSI: Unknown SS3 %c (0x%02x)\n", (char)cmd, cmd);
#endif
    return TERMKEY_RES_NONE;
  }

  *nbytep = introlen + 1;

  return TERMKEY_RES_KEY;
}

static TermKeyResult peekkey(TermKey *tk, void *info, TermKeyKey *key, int force, size_t *nbytep)
{
  if(tk->buffcount == 0)
    return tk->is_closed ? TERMKEY_RES_EOF : TERMKEY_RES_NONE;

  TermKeyCsi *csi = info;

  // Now we're sure at least 1 byte is valid
  unsigned char b0 = CHARAT(0);

  if(b0 == 0x1b && tk->buffcount > 1 && CHARAT(1) == '[') {
    return peekkey_csi(tk, csi, 2, key, force, nbytep);
  }
  else if(b0 == 0x1b && tk->buffcount > 1 && CHARAT(1) == 'O') {
    return peekkey_ss3(tk, csi, 2, key, force, nbytep);
  }
  else if(b0 == 0x8f) {
    return peekkey_ss3(tk, csi, 1, key, force, nbytep);
  }
  else if(b0 == 0x9b) {
    return peekkey_csi(tk, csi, 1, key, force, nbytep);
  }
  else
    return TERMKEY_RES_NONE;
}

struct TermKeyDriver termkey_driver_csi = {
  .name        = "CSI",

  .new_driver  = new_driver,
  .free_driver = free_driver,

  .peekkey = peekkey,
};