File: input.c

package info (click to toggle)
jzip 210r20001005d-2
  • links: PTS
  • area: main
  • in suites: wheezy
  • size: 1,088 kB
  • sloc: ansic: 11,700; makefile: 64; sh: 27
file content (607 lines) | stat: -rw-r--r-- 14,506 bytes parent folder | download | duplicates (4)
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
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607

/* $Id: input.c,v 1.3 2000/07/05 15:20:34 jholder Exp $   
 * --------------------------------------------------------------------
 * see doc/License.txt for License Information   
 * --------------------------------------------------------------------
 * 
 * File name: $Id: input.c,v 1.3 2000/07/05 15:20:34 jholder Exp $  
 *   
 * Description:    
 *    
 * Modification history:      
 * $Log: input.c,v $
 * Revision 1.3  2000/07/05 15:20:34  jholder
 * Updated code to remove warnings.
 *
 * Revision 1.2  2000/05/25 22:28:56  jholder
 * changes routine names to reflect zmachine opcode names per spec 1.0
 *
 * Revision 1.1.1.1  2000/05/10 14:21:34  jholder
 *
 * imported
 *
 *
 * --------------------------------------------------------------------
 */

/*
 * input.c
 *
 * Input routines
 *
 */

#include "ztypes.h"

/* Statically defined word separator list */

static const char *separators = " \t\n\f.,?";
static zword_t dictionary_offset = 0;
static ZINT16 dictionary_size = 0;
static unsigned int entry_size = 0;

static void tokenise_line( zword_t, zword_t, zword_t, zword_t );
static const char *next_token( const char *, const char *, const char **, int *, const char * );
static zword_t find_word( int, const char *, long );

/*
 * z_read_char
 *
 * Read one character with optional timeout
 *
 *    argv[0] = input device (must be 1)
 *    argv[1] = timeout value in tenths of a second (optional)
 *    argv[2] = timeout action routine (optional)
 *
 */

void z_read_char( int argc, zword_t * argv )
{
   int c;
   zword_t arg_list[2];

   /* Supply default parameters */

   if ( argc < 3 )
      argv[2] = 0;
   if ( argc < 2 )
      argv[1] = 0;

   /* Flush any buffered output before read */

   flush_buffer( FALSE );

   /* Reset line count */

   lines_written = 0;

   /* If more than one characters was asked for then fail the call */

   if ( argv[0] != 1 )

      c = 0;

   else
   {

      if ( ( c = playback_key(  ) ) == -1 )
      {

         /* Setup the timeout routine argument list */

         arg_list[0] = argv[2];
         arg_list[1] = 0;       /* as per spec 1.0 */
         /* was: arg_list[1] = argv[1]/10; */

         /* Read a character with a timeout. If the input timed out then
          * call the timeout action routine. If the return status from the
          * timeout routine was 0 then try to read a character again */

         do
         {
            flush_buffer( FALSE );
            c = input_character( ( int ) argv[1] );
         }
         while ( c == -1 && z_call( 1, arg_list, ASYNC ) == 0 );

         /* Fail call if input timed out */

         if ( c == -1 )
            c = 0;
         else
            record_key( c );
      }
   }

   store_operand( (zword_t)c );

}                               /* z_read_char */

/*
 * z_sread_aread
 *
 * Read a line of input with optional timeout.
 *
 *    argv[0] = character buffer address
 *    argv[1] = token buffer address
 *    argv[2] = timeout value in seconds (optional)
 *    argv[3] = timeout action routine (optional)
 *
 */

void z_sread_aread( int argc, zword_t * argv )
{
   int i, in_size, out_size, terminator;
   char *cbuf, *buffer;

   /* Supply default parameters */

   if ( argc < 4 )
      argv[3] = 0;
   if ( argc < 3 )
      argv[2] = 0;
   if ( argc < 2 )
      argv[1] = 0;

   /* Refresh status line */

   if ( h_type < V4 )
      z_show_status(  );

   /* Flush any buffered output before read */

   flush_buffer( TRUE );

   /* Reset line count */

   lines_written = 0;

   /* Initialise character pointer and initial read size */

   cbuf = ( char * ) &datap[argv[0]];
   in_size = ( h_type > V4 ) ? cbuf[1] : 0;

   /* Read the line then script and record it */

   terminator = get_line( cbuf, argv[2], argv[3] );
   script_line( ( h_type > V4 ) ? &cbuf[2] : &cbuf[1] );
   record_line( ( h_type > V4 ) ? &cbuf[2] : &cbuf[1] );

   /* Convert new text in line to lowercase */

   if ( h_type > V4 )
   {
      buffer = &cbuf[2];
      out_size = cbuf[1];
   }
   else
   {
      buffer = &cbuf[1];
      out_size = strlen( buffer );
   }

   if ( out_size > in_size )
      for ( i = in_size; i < out_size; i++ )
         buffer[i] = ( char ) tolower( buffer[i] );

   /* Tokenise the line, if a token buffer is present */

   if ( argv[1] )
      tokenise_line( argv[0], argv[1], h_words_offset, 0 );

   /* Return the line terminator */

   if ( h_type > V4 )
      store_operand( ( zword_t ) terminator );

}                               /* z_sread_aread */

/*
 * get_line
 *
 * Read a line of input and lower case it.
 *
 */

int get_line( char *cbuf, zword_t timeout, zword_t action_routine )
{
   char *buffer;
   int buflen, read_size, status, c;
   zword_t arg_list[2];

   /* Set maximum buffer size to width of screen minus any
    * right margin and 1 character for a terminating NULL */

   buflen = ( screen_cols > 127 ) ? 127 : screen_cols;
   buflen -= right_margin + 1;
   if ( ( int ) cbuf[0] <= buflen )
      buflen = cbuf[0];

   /* Set read size and start of read buffer. The buffer may already be
    * primed with some text in V5 games. The Z-code will have already
    * displayed the text so we don't have to do that */

   if ( h_type > V4 )
   {
      read_size = cbuf[1];
      buffer = &cbuf[2];
   }
   else
   {
      read_size = 0;
      buffer = &cbuf[1];
   }

   /* Try to read input from command file */

   c = playback_line( buflen, buffer, &read_size );

   if ( c == -1 )
   {

      /* Setup the timeout routine argument list */

      arg_list[0] = action_routine;
      arg_list[1] = 0;          /*  as per spec.1.0  */
      /* arg_list[1] = timeout/10; */

      /* Read a line with a timeout. If the input timed out then
       * call the timeout action routine. If the return status from the
       * timeout routine was 0 then try to read the line again */

      do
      {
         c = input_line( buflen, buffer, timeout, &read_size );
         status = 0;
      }
      while ( c == -1 && ( status = z_call( 1, arg_list, ASYNC ) ) == 0 );

      /* Throw away any input if timeout returns success */

      if ( status )
         read_size = 0;


   }

   /* Zero terminate line */

   if ( h_type > V4 )
   {
      cbuf[1] = ( char ) read_size;
   }
   else
   {
      /* Zero terminate line (V1-4 only) */
      buffer[read_size] = '\0';
   }

   return ( c );

}                               /* get_line */

/*
 * tokenise_line
 *
 * Convert a typed input line into tokens. The token buffer needs some
 * additional explanation. The first byte is the maximum number of tokens
 * allowed. The second byte is set to the actual number of token read. Each
 * token is composed of 3 fields. The first (word) field contains the word
 * offset in the dictionary, the second (byte) field contains the token length,
 * and the third (byte) field contains the start offset of the token in the
 * character buffer.
 *
 */

static void tokenise_line( zword_t char_buf, zword_t token_buf, zword_t dictionary, zword_t flag )
{
   int i, count, words, token_length;
   long word_index, chop = 0;
   int slen;
   char *str_end;
   char *cbuf, *tbuf, *tp;
   const char *cp, *token=NULL;
   char punctuation[16];
   zword_t word;

   /* Initialise character and token buffer pointers */

   cbuf = ( char * ) &datap[char_buf];
   tbuf = ( char * ) &datap[token_buf];

   /* Find the string length */

   if ( h_type > V4 )
   {
      slen = ( unsigned char ) ( cbuf[1] );
      str_end = cbuf + 2 + slen;
   }
   else
   {
      slen = strlen( cbuf + 1 );
      str_end = cbuf + 1 + slen;
   }

   /* Initialise word count and pointers */

   words = 0;
   cp = ( h_type > V4 ) ? cbuf + 2 : cbuf + 1;
   tp = tbuf + 2;

   /* Initialise dictionary */

   count = get_byte( dictionary++ );
   for ( i = 0; i < count; i++ )
      punctuation[i] = get_byte( dictionary++ );
   punctuation[i] = '\0';
   entry_size = get_byte( dictionary++ );
   dictionary_size = ( ZINT16 ) get_word( dictionary );
   dictionary_offset = dictionary + 2;

   /* Calculate the binary chop start position */

   if ( dictionary_size > 0 )
   {
      word_index = dictionary_size / 2;
      chop = 1;
      do
         chop *= 2;
      while ( word_index /= 2 );
   }

   /* Tokenise the line */

   do
   {

      /* Skip to next token */

      cp = next_token( cp, str_end, &token, &token_length, punctuation );
      if ( token_length ) {

         /* If still space in token buffer then store word */

         if ( words <= tbuf[0] )
         {

            /* Get the word offset from the dictionary */

            word = find_word( token_length, token, chop );

            /* Store the dictionary offset, token length and offset */

            if ( word || flag == 0 )
            {
               tp[0] = ( char ) ( word >> 8 );
               tp[1] = ( char ) ( word & 0xff );
            }
            tp[2] = ( char ) token_length;
            tp[3] = ( char ) ( token - cbuf );

            /* Step to next token position and count the word */

            tp += 4;
            words++;
         }
         else
         {

            /* Moan if token buffer space exhausted */

            output_string( "Too many words typed, discarding: " );
            output_line( token );
         }
      }
   }
   while ( token_length );

   /* Store word count */

   tbuf[1] = ( char ) words;

}                               /* tokenise_line */

/*
 * next_token
 *
 * Find next token in a string. The token (word) is delimited by a statically
 * defined and a game specific set of word separators. The game specific set
 * of separators look like real word separators, but the parser wants to know
 * about them. An example would be: 'grue, take the axe. go north'. The
 * parser wants to know about the comma and the period so that it can correctly
 * parse the line. The 'interesting' word separators normally appear at the
 * start of the dictionary, and are also put in a separate list in the game
 * file.
 *
 */

static const char *next_token( const char *s, const char *str_end, const char **token, int *length,
                               const char *punctuation )
{
   int i;

   /* Set the token length to zero */

   *length = 0;

   /* Step through the string looking for separators */

   for ( ; s < str_end; s++ )
   {

      /* Look for game specific word separators first */

      for ( i = 0; punctuation[i] && *s != punctuation[i]; i++ )
         ;

      /* If a separator is found then return the information */

      if ( punctuation[i] )
      {

         /* If length has been set then just return the word position */

         if ( *length )
            return ( s );
         else
         {

            /* End of word, so set length, token pointer and return string */

            ( *length )++;
            *token = s;
            return ( ++s );
         }
      }

      /* Look for statically defined separators last */

      for ( i = 0; separators[i] && *s != separators[i]; i++ )
         ;

      /* If a separator is found then return the information */

      if ( separators[i] )
      {

         /* If length has been set then just return the word position */

         if ( *length )
            return ( ++s );
      }
      else
      {

         /* If first token character then remember its position */

         if ( *length == 0 )
            *token = s;
         ( *length )++;
      }
   }

   return ( s );

}                               /* next_token */

/*
 * find_word
 *
 * Search the dictionary for a word. Just encode the word and binary chop the
 * dictionary looking for it.
 *
 */

static zword_t find_word( int len, const char *cp, long chop )
{
   ZINT16 word[3];
   long word_index, offset, status;

   /* Don't look up the word if there are no dictionary entries */

   if ( dictionary_size == 0 )
      return ( 0 );

   /* Encode target word */

   encode_text( len, cp, word );

   /* Do a binary chop search on the main dictionary, otherwise do
    * a linear search */

   word_index = chop - 1;

   if ( dictionary_size > 0 )
   {

      /* Binary chop until the word is found */

      while ( chop )
      {

         chop /= 2;

         /* Calculate dictionary offset */

         if ( word_index > ( dictionary_size - 1 ) )
            word_index = dictionary_size - 1;

         offset = dictionary_offset + ( word_index * entry_size );

         /* If word matches then return dictionary offset */

         if ( ( status = word[0] - ( ZINT16 ) get_word( offset + 0 ) ) == 0                &&
              ( status = word[1] - ( ZINT16 ) get_word( offset + 2 ) ) == 0                && 
              ( h_type < V4 || ( status = word[2] - ( ZINT16 ) get_word( offset + 4 ) ) == 0 ) )
            return ( ( zword_t ) offset );

         /* Set next position depending on direction of overshoot */

         if ( status > 0 )
         {
            word_index += chop;

            /* Deal with end of dictionary case */

            if ( word_index >= ( int ) dictionary_size )
               word_index = dictionary_size - 1;
         }
         else
         {
            word_index -= chop;

            /* Deal with start of dictionary case */

            if ( word_index < 0 )
               word_index = 0;
         }
      }
   }
   else
   {

      for ( word_index = 0; word_index < -dictionary_size; word_index++ )
      {

         /* Calculate dictionary offset */

         offset = dictionary_offset + ( word_index * entry_size );

         /* If word matches then return dictionary offset */

         if ( ( status = word[0] - ( ZINT16 ) get_word( offset + 0 ) ) == 0                &&
              ( status = word[1] - ( ZINT16 ) get_word( offset + 2 ) ) == 0                && 
              ( h_type < V4 || ( status = word[2] - ( ZINT16 ) get_word( offset + 4 ) ) == 0 ) )
            return ( ( zword_t ) offset );
      }
   }

   return ( 0 );

}                               /* find_word */

/*
 * z_tokenise
 *
 *    argv[0] = character buffer address
 *    argv[1] = token buffer address
 *    argv[2] = alternate vocabulary table
 *    argv[3] = ignore unknown words flag
 *
 */

void z_tokenise( int argc, zword_t * argv )
{

   /* Supply default parameters */

   if ( argc < 4 )
      argv[3] = 0;
   if ( argc < 3 )
      argv[2] = h_words_offset;

   /* Convert the line to tokens */

   tokenise_line( argv[0], argv[1], argv[2], argv[3] );

}                               /* z_tokenise */