File: serialPOS.c

package info (click to toggle)
lcdproc 0.5.9-3
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 5,064 kB
  • sloc: ansic: 59,645; sh: 1,740; perl: 681; makefile: 417
file content (988 lines) | stat: -rw-r--r-- 25,175 bytes parent folder | download | duplicates (3)
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
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
/** \file server/drivers/serialPOS.c
 * LCDd \c serialPOS driver for Point Of Sale ("POS") devices using
 * various protocols.
 */

/* 	This is the LCDproc driver for Point Of Sale ("POS") devices using
	various protocols.  While it currently only supports AEDEX,
	it can be extended to provide support for many POS emulation types.

	Copyright (C) 2006, 2007 Eric Pooch

	This driver is based on MtxOrb.c driver and is subject to its copyrights.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301


List of driver entry point:

init		Implemented.
close		Implemented.
width		Implemented.
height		Implemented.
clear		Implemented.
flush		Implemented.
string		Implemented.
chr		Implemented.
vbar		Implemented.
hbar		Implemented.
num		Implemented.
heartbeat	Implemented.
icon		NOT IMPLEMENTED: not part of any POS protocol
cursor		Implemented.
set_char	NOT IMPLEMENTED
get_free_chars	Implemented, always returns 0.
cellwidth	Implemented.
cellheight	Implemented.
get_contrast	NOT IMPLEMENTED: not part of AEDEX protocol
set_contrast	NOT IMPLEMENTED: not part of AEDEX protocol
get_brightness	NOT IMPLEMENTED: not part of AEDEX protocol
set_brightness	NOT IMPLEMENTED: not part of AEDEX protocol
backlight	NOT IMPLEMENTED: not part of AEDEX protocol
output		NOT IMPLEMENTED: not part of any POS protocol
get_key		Implemented for devices using a pass-through serial port connected to an RS232 terminal or keyboard.
get_info	Implemented.
*/

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <termios.h>
#include <fcntl.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <ctype.h>

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "lcd.h"
#include "serialPOS.h"
#include "adv_bignum.h"

#include "shared/report.h"


/*
 * The serialPOS driver does not use a lot of hardware features.
 * We try to replace them with more flexible software alternatives.
 * That's why vbar/hbar/bignum are using locally-defined functions;
 * it permits simultaneous use of those features and custom chars.
 *
 * For the same reason, we don't use the hardware clear but rather
 * empty the internal frame buffer.  The frame buffer holds all
 * the requested changes until the server asks us to flush the
 * changes to the display.  This also permits us to do an
 * incremental update and reduce the number of characters to be
 * sent to the display across the serial link.
 *
 * In order to display graphic widgets, we define and use our own
 * custom characters.  To avoid multiple definitions of the same
 * custom characters, we use a caching mechanism that remembers
 * what is currently defined.  In order to avoid always redefining
 * the same custom character at the beginning of the table, we
 * rotate the beginning of the table.  This is supposed to reduce
 * the number of character redefinitions and make the caching more
 * effective.  The overall goal is to reduce the number of
 * characters sent to the display.
 */


typedef enum {
	POS_IEE = 0,
	POS_AEDEX,				/* http://www.posguys.com/download/CD5220_Manual.pdf */
	POS_Epson,				/* http://www.barcode-manufacturer.com/pdf/vfd_manual.pdf */
	POS_Emax,
	POS_IBM,
	POS_LogicControls,		/* http://www.posguys.com/download/CD5220_Manual.pdf */
	POS_Ultimate
} POS_EmulationType;

#define AEDEXDefaultPrefix "!#"
#define AEDEXPrefix "~`"

typedef enum {
	AEDEXLine1Display = 1,	/*	upper line display	*/
	AEDEXLine2Display,		/*	bottom line display	*/
	AEDEXLine3Display,		/*	not sure what this code really is	*/
	AEDEXContinuousScroll,	/*	upper line message scroll continuously	*/
	AEDEXDisplayTime,		/*	"hh':'mm" h,m='0'-'9' display time	*/
	AEDEXSingleScroll,		/*	upper line message scroll one pass	*/
	AEDEXAllScroll,			/*	not sure what this code really is	*/
	AEDEXChangeCode,		/*	change attention code	*/
	AEDEXAllLineDisplay		/*	two line display	*/
} AEDEXCommands;


/** private data for the \c serialPOS driver */
typedef struct serialPOS_private_data {
	int fd;			/**< LCD file descriptor */

	/* dimensions */
	int width, height;
	int cellwidth, cellheight;

	/* framebuffer and buffer for old LCD contents */
	unsigned char *framebuf;
	unsigned char *backingstore;

	/* feature enable */
	int hardwrap;
	int hardscroll;

	POS_EmulationType emulation_mode;	/**< emulation type */

	char info[255];		/**< static data from serialPOS_get_info */
} PrivateData;


/* Vars for the server core */
MODULE_EXPORT char *api_version = API_VERSION;
MODULE_EXPORT int stay_in_foreground = 0;
MODULE_EXPORT int supports_multiple = 1;
MODULE_EXPORT char *symbol_prefix = "serialPOS_";

static void serialPOS_hardware_init(Driver *drvthis);
static void serialPOS_hardware_clear(Driver *drvthis);
static void serialPOS_linewrap(Driver *drvthis, int on);
static void serialPOS_autoscroll(Driver *drvthis, int on);
static void serialPOS_cursorblink(Driver *drvthis, int on);
static void serialPOS_cursor_goto(Driver *drvthis, int x, int y);


/* Parse one key from the configfile */
static char
serialPOS_parse_keypad_setting (Driver *drvthis, char *keyname, char default_value)
{
	char return_val = 0;
	const char *s;
	char buf[255];

	s = drvthis->config_get_string(drvthis->name, keyname, 0, NULL);
	if (s != NULL) {
		strncpy(buf, s, sizeof(buf));
		buf[sizeof(buf)-1] = '\0';
		return_val = buf[0];
	} else {
		return_val = default_value;
	}
	return return_val;
}


/**
 * Initialize the driver.
 * \param drvthis  Pointer to driver structure.
 * \retval 0       Success.
 * \retval <0      Error.
 */
MODULE_EXPORT int
serialPOS_init (Driver *drvthis)
{
	struct termios portset;

	char device[256] = DEFAULT_DEVICE;
	int speed = DEFAULT_SPEED;
	char size[256] = DEFAULT_SIZE;
	char buf[256] = "";
	int tmp, w, h;

	PrivateData *p;

	/* Alocate and store private data */
	p = (PrivateData *) malloc(sizeof(PrivateData));
	if (p == NULL)
		return -1;
	if (drvthis->store_private_ptr(drvthis, p))
		return -1;

	/* Initialise the PrivateData structure */
	p->fd = -1;

	p->width = LCD_DEFAULT_WIDTH;
	p->height = LCD_DEFAULT_HEIGHT;
	p->cellwidth = LCD_DEFAULT_CELLWIDTH;
	p->cellheight = LCD_DEFAULT_CELLHEIGHT;

	p->framebuf = NULL;
	p->backingstore = NULL;

	p->hardwrap = 0;
	p->hardscroll = 0;

	p->emulation_mode = POS_AEDEX;

	debug(RPT_INFO, "serialPOS: init(%p)", drvthis);

	/* READ CONFIG FILE */

	/* Get serial device to use */
	strncpy(device, drvthis->config_get_string(drvthis->name, "Device", 0, DEFAULT_DEVICE), sizeof(device));
	device[sizeof(device)-1] = '\0';
	report(RPT_INFO, "%s: using Device %s", drvthis->name, device);

	/* Get emulation type */
	strncpy(buf, drvthis->config_get_string(drvthis->name, "Type", 0, DEFAULT_TYPE), sizeof(buf));
	buf[sizeof(buf)-1] = '\0';
	if (strncasecmp(buf, "IEE", 3) == 0) {
		p->emulation_mode = POS_IEE;
	} else if (strncasecmp(buf, "AED", 3) == 0) {
		p->emulation_mode = POS_AEDEX;
	} else if (strncasecmp(buf, "Eps", 3) == 0) {
		p->emulation_mode = POS_Epson;
	} else if (strncasecmp(buf, "Ema", 3) == 0) {
		p->emulation_mode = POS_Emax;
	} else if (strncasecmp(buf, "Log", 3) == 0) {
		p->emulation_mode = POS_LogicControls;
	} else if (strncasecmp(buf, "IBM", 3) == 0) {
		p->emulation_mode = POS_IBM;
	} else if (strncasecmp(buf, "Ult", 3) == 0) {
		p->emulation_mode = POS_Ultimate;
	} else {
		report(RPT_ERR, "%s: unknown display Type %s; must be one of IEE, AEDEX, Epson, Emax, Logic Controls or Ultimate",
				drvthis->name, buf);
		return -1;
	}

	/* Get display size */
	strncpy(size, drvthis->config_get_string(drvthis->name, "Size", 0, DEFAULT_SIZE), sizeof(size));
	size[sizeof(size)-1] = '\0';
	if ((sscanf(size, "%dx%d", &w, &h) != 2)
	    || (w <= 0) || (w > LCD_MAX_WIDTH)
	    || (h <= 0) || (h > LCD_MAX_HEIGHT)) {
		report(RPT_WARNING, "%s: cannot read Size: %s; using default %s",
				drvthis->name, size, DEFAULT_SIZE);
		sscanf(DEFAULT_SIZE , "%dx%d", &w, &h);
	}
	p->width = w;
	p->height = h;

	/* Get speed */
	tmp = drvthis->config_get_int(drvthis->name, "Speed", 0, DEFAULT_SPEED);
	switch (tmp) {
		case 1200:
			speed = B1200;
			break;
		case 2400:
			speed = B2400;
			break;
		case 4800:
			speed = B4800;
			break;
		case 9600:
			speed = B9600;
			break;
		default:
			speed = B9600;
			report(RPT_WARNING, "%s: Speed must be 1200, 2400, 4800 or 9600; using default %d",
					drvthis->name, tmp);
	}

	/* Set up io port correctly, and open it... */
	p->fd = open(device, O_RDWR | O_NOCTTY);
	if (p->fd == -1) {
		report(RPT_ERR, "%s: open(%s) failed (%s)", drvthis->name, device, strerror(errno));
		if (errno == EACCES)
			report(RPT_ERR, "%s: %s device could not be opened...", drvthis->name, device);
  		return -1;
	}
	report(RPT_INFO, "%s: opened display on %s", drvthis->name, device);

	tcgetattr(p->fd, &portset);

	/* We use RAW mode */
#ifdef HAVE_CFMAKERAW
	/* The easy way */
	cfmakeraw(&portset);
#else
	/* The hard way */
	portset.c_iflag &= ~( IGNBRK | BRKINT | PARMRK | ISTRIP
			      | INLCR | IGNCR | ICRNL | IXON );
	portset.c_oflag &= ~OPOST;
	portset.c_lflag &= ~( ECHO | ECHONL | ICANON | ISIG | IEXTEN );
	portset.c_cflag &= ~( CSIZE | PARENB | CRTSCTS );
	portset.c_cflag |= CS8 | CREAD | CLOCAL;
#endif
	/* Set timeouts */
	portset.c_cc[VMIN] = 1;
	portset.c_cc[VTIME] = 3;

	/* Set port speed */
	cfsetospeed(&portset, speed);
	cfsetispeed(&portset, B0);

	/* Do it... */
	tcsetattr(p->fd, TCSANOW, &portset);

	/* Make sure the frame buffer is there... */
	p->framebuf = (unsigned char *) calloc(p->width * p->height, 1);
	if (p->framebuf == NULL) {
		report(RPT_ERR, "%s: unable to create framebuffer", drvthis->name);
		return -1;
	}
	memset(p->framebuf, ' ', p->width * p->height);

	/* make sure the framebuffer backing store is there... */
	p->backingstore = (unsigned char *) malloc(p->width * p->height);
	if (p->backingstore == NULL) {
		report(RPT_ERR, "%s: unable to create framebuffer backing store", drvthis->name);
		return -1;
	}
	memset(p->backingstore, ' ', p->width * p->height);

	/* set initial LCD configuration */
	serialPOS_hardware_init(drvthis);
	serialPOS_linewrap(drvthis, DEFAULT_LINEWRAP);
	serialPOS_autoscroll(drvthis, DEFAULT_AUTOSCROLL);

	report(RPT_DEBUG, "%s: init() done", drvthis->name);

	return 0;
}


/**
 * Close the driver (do necessary clean-up).
 * \param drvthis  Pointer to driver structure.
 */
MODULE_EXPORT void
serialPOS_close (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	if (p != NULL) {
		if (p->fd >= 0)
			close(p->fd);

		if (p->framebuf)
			free(p->framebuf);
		p->framebuf = NULL;

		if (p->backingstore)
			free(p->backingstore);
		p->backingstore = NULL;

		free(p);
	}
	drvthis->store_private_ptr(drvthis, NULL);
	debug(RPT_DEBUG, "serialPOS: closed");
}


/**
 * Return the display width in characters.
 * \param drvthis  Pointer to driver structure.
 * \return         Number of characters the display is wide.
 */
MODULE_EXPORT int
serialPOS_width (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	return p->width;
}


/**
 * Return the display height in characters.
 * \param drvthis  Pointer to driver structure.
 * \return         Number of characters the display is high.
 */
MODULE_EXPORT int
serialPOS_height (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	return p->height;
}


/**
 * Get total number of custom characters available.
 * \param drvthis  Pointer to driver structure.
 * \return         Number of custom characters (always \c 0 ).
 */
MODULE_EXPORT int
serialPOS_get_free_chars (Driver *drvthis)
{
	return 0;
}


/**
 * Return the width of a character in pixels.
 * \param drvthis  Pointer to driver structure.
 * \return         Number of pixel columns a character cell is wide.
 */
MODULE_EXPORT int
serialPOS_cellwidth (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	return p->cellwidth;
}


/**
 * Return the height of a character in pixels.
 * \param drvthis  Pointer to driver structure.
 * \return         Number of pixel lines a character cell is high.
 */
MODULE_EXPORT int
serialPOS_cellheight (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	return p->cellheight;
}


/**
 * Print a string on the screen at position (x,y).
 * The upper-left corner is (1,1), the lower-right corner is (p->width, p->height).
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column).
 * \param y	Vertical character position (row).
 * \param string   String that gets written.
 */
MODULE_EXPORT void
serialPOS_string (Driver *drvthis, int x, int y, const char string[])
{
	PrivateData *p = drvthis->private_data;
	int i;

	/* Convert 1-based coords to 0-based... */
	x--;
	y--;

	if ((y < 0) || (y >= p->height))
		return;

	for (i = 0; (string[i] != '\0') && (x < p->width); i++, x++) {
		/* Check for buffer overflows... */
		if (x >= 0)
			p->framebuf[(y * p->width) + x] = string[i];
	}

	report(RPT_DEBUG, "serialPOS: printed string at (%d,%d)", x, y);
}


/**
 * Clear the framebuffer.
 * \param drvthis  Pointer to driver structure.
 */
MODULE_EXPORT void
serialPOS_clear (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	/* replace all chars in framebuf with spaces */
	memset(p->framebuf, ' ', (p->width * p->height));

	report(RPT_DEBUG, "serialPOS: cleared framebuffer");
}


/**
 * Flush data on screen to the LCD.
 * \param drvthis  Pointer to driver structure.
 */
MODULE_EXPORT void
serialPOS_flush (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;

	int modified = 0;
	int i;

	for (i = 0; i < p->height; i++) {
		// set  pointers to start of the line in frame buffer & backing store
		unsigned char *sp = p->framebuf + (i * p->width);
		unsigned char *sq = p->backingstore + (i * p->width);

		unsigned int length = p->width+5;
		char out[length];

		debug(RPT_DEBUG, "Framebuf: '%.*s'", p->width, sp);
		debug(RPT_DEBUG, "Backingstore: '%.*s'", p->width, sq);

		/* Strategy:
		 * - not more than one update command per line
		 * - skip lines that are identical
		 */

		// skip over identical lines
		if ( memcmp(sp, sq, p->width) == 0) {
			/* The lines are the same. */
			continue;
		}

		/* there are differences, ... */
		report(RPT_DEBUG, "%s: l=%d string='%.*s'", __FUNCTION__, i, p->width, sp);

		switch ((int)p->emulation_mode) {
			case POS_AEDEX:	{

				int command = i+1;
				if ( i == 0 && p->hardscroll == 1 )
					command = AEDEXContinuousScroll;

				snprintf(out, length, "%s%d%.*s%c", AEDEXPrefix, command, p->width, sp, 13);
				debug(RPT_DEBUG, "%s%d%.*s%c", AEDEXPrefix, command, p->width, sp, 13);
				break;
			}

			default:
				/* Send to correct line, then write the data */
				serialPOS_cursor_goto(drvthis, 1, i+1);
				length = p->width+1;
				snprintf(out, length, "%s", sp);
				break;
		}
		debug(RPT_DEBUG, "%s%c", out);

 		write(p->fd, out, length);

		modified++;
	}

	if (modified)
		memcpy(p->backingstore, p->framebuf, p->width * p->height);

	report(RPT_DEBUG, "serialPOS: frame buffer flushed");
}


/**
 * Print a character on the screen at position (x,y).
 * The upper-left corner is (1,1), the lower-right corner is (p->width, p->height).
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column).
 * \param y	Vertical character position (row).
 * \param c	Character that gets written.
 */
MODULE_EXPORT void
serialPOS_chr (Driver *drvthis, int x, int y, char c)
{
	PrivateData *p = drvthis->private_data;

	/* Convert 1-based coords to 0-based... */
	x--;
	y--;

	if ((x >= 0) && (y >= 0) && (x < p->width) && (y < p->height))
			p->framebuf[(y * p->width) + x] = c;

	report(RPT_DEBUG, "writing character %02X to position (%d,%d)", c, x, y);
}

/**
 * Send init codes for the display.
 * \param drvthis  Pointer to driver structure.
 */
static void
serialPOS_hardware_init(Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;


	switch ((int)p->emulation_mode) {
		case POS_AEDEX:	{
			/* The # character might interfere with the AEDEX command set,
			   so change the AEDEX attention code.
			*/
			unsigned int length = 8;
			char out[length];

			snprintf(out, length, "%s%d%s%c", AEDEXDefaultPrefix, AEDEXChangeCode, AEDEXPrefix, 13);
			write(p->fd, out, length);

			break;
		}
		case POS_Epson:
			write(p->fd, "\x1B\x40", 2);
			break;

		case POS_LogicControls:
			write(p->fd, "\x11", 1);
			break;

		default:
			return;
	}
}


/**
 * Clear the LCD using its hardware command
 * \param drvthis  Pointer to driver structure.
 */
static void
serialPOS_hardware_clear (Driver *drvthis)
{
	/* Do a hardware clear, if possible. */
	PrivateData *p = drvthis->private_data;

	switch ((int)p->emulation_mode) {
		case POS_AEDEX: {
			unsigned int length = 7;
			char out[length];

			snprintf(out, length, "%s%c %d", AEDEXPrefix, AEDEXAllLineDisplay, 13);
			write(p->fd, out, length);
			break;
		}

		case POS_Epson:
			write(p->fd, "\x0C", 1);
			break;

		case POS_LogicControls:
			write(p->fd, "\x1F", 1);
			break;

		default:
			return;
	}

	debug(RPT_DEBUG, "serialPOS: cleared LCD");
}


/**
 * Turn the POS's built-in linewrapping feature on or off.
 * \param drvthis  Pointer to driver structure.
 * \param on       New state.
 */
static void
serialPOS_linewrap (Driver *drvthis, int on)
{
	PrivateData *p = drvthis->private_data;

	p->hardwrap = on;

	debug(RPT_DEBUG, "serialPOS: linewrap turned %s", (on) ? "on" : "off");
}


/**
 * Turn the POS's built-in automatic scrolling feature on or off.
 * \param drvthis  Pointer to driver structure.
 * \param on       New state.
 */
static void
serialPOS_autoscroll (Driver *drvthis, int on)
{
	PrivateData *p = drvthis->private_data;

	p->hardscroll = on;

	debug(RPT_DEBUG, "serialPOS: autoscroll turned %s", (on) ? "on" : "off");
}


/**
 * Turn POS's hardware cursor blinking on or off.
 * \param drvthis  Pointer to driver structure.
 * \param on       New state.
 *
 */
static void
serialPOS_cursorblink (Driver *drvthis, int on)
{
	//PrivateData *p = drvthis->private_data;

	debug(RPT_DEBUG, "serialPOS: cursorblink turned %s", (on) ? "on" : "off");
}


/**
 * Move cursor to position (x,y).
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column).
 * \param y	Vertical character position (row).
 */
static void
serialPOS_cursor_goto(Driver *drvthis, int x, int y)
{
	PrivateData *p = drvthis->private_data;
	unsigned int length = 8;
	char out[length];

	switch ((int)p->emulation_mode) {
		case POS_Epson:
			length = 7;

			snprintf(out, length, "%c%c%02d%02d", 0x1F, 0x24, x, y);
			break;

		case POS_LogicControls:
			length = 4;

			snprintf(out, length, "%c%02d", 0x10, (x-1+((y-1)*(p->width))));
			break;

		default:
			return;
	}

	write(p->fd, out, length);
}


/**
 * Provide general information about the POS display.
 * \param drvthis  Pointer to driver structure.
 * \return         Constant string with information.
 */
MODULE_EXPORT const char *
serialPOS_get_info (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;
	strcpy(p->info, "Driver for Point of Sale Displays.");
	return p->info;
}


/**
 * Draw a vertical bar bottom-up.
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column) of the starting point.
 * \param y	Vertical character position (row) of the starting point.
 * \param len      Number of characters that the bar is high at 100%
 * \param promille Current height level of the bar in promille.
 * \param options  Options (currently unused).
 */
MODULE_EXPORT void
serialPOS_vbar (Driver *drvthis, int x, int y, int len, int promille, int options)
{
	PrivateData *p = drvthis->private_data;
	// map
	char ascii_map[] = { ' ', ' ', '-', '-', '=', '=', '%', '%' };
	char *map = ascii_map;
	int pixels = ((long) 2 * len * p->cellheight) * promille / 2000;
	int pos;


	if ((x <= 0) || (y <= 0) || (x > p->width))
		return;

	/* x and y are the start position of the bar.
	 * The bar by default grows in the 'up' direction
	 * (other direction not yet implemented).
	 * len is the number of characters that the bar is long at 100%
	 * promille is the number of promilles (0..1000) that the bar should be filled.
	 */

	for (pos = 0; pos < len; pos++) {

		if (y - pos <= 0)
			return;

		if (pixels >= p->cellheight) {
			/* write a "full" block to the screen... */
			serialPOS_chr(drvthis, x, y-pos, '%');
		}
		else if (pixels > 0) {
			// write a partial block...
			serialPOS_chr(drvthis, x, y-pos, map[len-1]);
			break;
		}
		else {
			; // write nothing (not even a space)
		}

		pixels -= p->cellheight;
	}
}


/**
 * Draw a horizontal bar to the right.
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column) of the starting point.
 * \param y	Vertical character position (row) of the starting point.
 * \param len      Number of characters that the bar is long at 100%
 * \param promille Current length level of the bar in promille.
 * \param options  Options (currently unused).
 */
MODULE_EXPORT void
serialPOS_hbar (Driver *drvthis, int x, int y, int len, int promille, int options)
{
	PrivateData *p = drvthis->private_data;
	int pixels = ((long) 2 * len * p->cellwidth) * promille / 2000;
	int pos;

	if ((x <= 0) || (y <= 0) || (y > p->height))
		return;

	/* x and y are the start position of the bar.
	 * The bar by default grows in the 'right' direction
	 * (other direction not yet implemented).
	 * len is the number of characters that the bar is long at 100%
	 * promille is the number of promilles (0..1000) that the bar should be filled.
	 */

	for (pos = 0; pos < len; pos++) {

		if (x + pos > p->width)
			return;

		if (pixels >= p->cellwidth * 2/3) {
			/* write a "full" block to the screen... */
			serialPOS_chr(drvthis, x+pos, y, '=');
		}
		else if (pixels > p->cellwidth * 1/3) {
			/* write a partial block... */
			serialPOS_chr(drvthis, x+pos, y, '-');
			break;
		}
		else {
			; // write nothing (not even a space)
		}

		pixels -= p->cellwidth;
	}
}


/**
 * Write a big number to the screen.
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal character position (column).
 * \param num      Character to write (0 - 10 with 10 representing ':')
 */
MODULE_EXPORT void
serialPOS_num(Driver * drvthis, int x, int num)
{
        // Lib_adv_bignum does everything needed to show the bignumbers.
        lib_adv_bignum(drvthis, x, num, 0, 0);
}

/**
 * Set cursor position and state.
 * \param drvthis  Pointer to driver structure.
 * \param x	Horizontal cursor position (column).
 * \param y	Vertical cursor position (row).
 * \param state    New cursor state.
 */
MODULE_EXPORT void
serialPOS_cursor (Driver *drvthis, int x, int y, int state)
{
	PrivateData *p = drvthis->private_data;

	switch ((int)p->emulation_mode) {
		case POS_LogicControls:
			switch (state) {
				case CURSOR_OFF:        // no cursor
					write(p->fd, "\x14", 1);
					break;
				case CURSOR_DEFAULT_ON: // blinking block
					write(p->fd, "\x13", 1);
					break;
				default:
					break;
			}
			break;

		default:
			/* set cursor state not supported */
			break;
	}

	/* set cursor position */
	serialPOS_cursor_goto(drvthis, x, y);
}


/**
 * Get key from a pass-through port of the POS display.
 * \param drvthis  Pointer to driver structure.
 * \return         String representation of the key;
 *                 \c NULL if nothing available / unmapped key.
 */
MODULE_EXPORT const char *
serialPOS_get_key (Driver *drvthis)
{
	PrivateData *p = drvthis->private_data;
	int ret;
	char buf;
	const char *key = NULL;
	static struct timeval selectTimeout = { 0, 0 };
	fd_set fdset;

	FD_ZERO(&fdset);
	FD_SET(p->fd, &fdset);

	if ((ret = select(FD_SETSIZE, &fdset, NULL, NULL, &selectTimeout)) < 0) {
		report(RPT_DEBUG, "%s: get_key: select() failed (%s)",
				drvthis->name, strerror(errno));
		return NULL;
	}
	if (!ret) {
		FD_SET(p->fd, &fdset);
		return NULL;
	}

	if (!FD_ISSET(p->fd, &fdset))
		return NULL;

	if ((ret = read(p->fd, &buf, 1)) < 0) {
		report(RPT_DEBUG, "%s: get_key: read() failed (%s)",
				drvthis->name, strerror(errno));
		return NULL;
	}

	if (ret == 1) {

		switch (buf) {
		case 13:
			key = "Enter";
			break;
		case 65:
			key = "Up";
			break;
		case 66:
			key = "Down";
			break;
		case 67:
			key = "Right";
			break;
		case 68:
			key = "Left";
			break;
		case 8:
			key = "Escape";
			break;
		default:
			report(RPT_DEBUG, "%s get_key: illegal key 0x%02X",
					drvthis->name, buf);
			return NULL;
		}

		report(RPT_DEBUG, "%s: get_key: returns %s", drvthis->name, key);
		return key;
	}

	return NULL;
}


/* EOF */