summaryrefslogtreecommitdiffstats
path: root/contrib/less/lesskey.c
blob: 2e95c20dcf51dd19598513ae30034ea17bc96ba2 (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
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
/*
 * Copyright (C) 1984-2007  Mark Nudelman
 *
 * You may distribute under the terms of either the GNU General Public
 * License or the Less License, as specified in the README file.
 *
 * For more information about less, or for information on how to 
 * contact the author, see the README file.
 */


/*
 *	lesskey [-o output] [input]
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 *
 *	Make a .less file.
 *	If no input file is specified, standard input is used.
 *	If no output file is specified, $HOME/.less is used.
 *
 *	The .less file is used to specify (to "less") user-defined
 *	key bindings.  Basically any sequence of 1 to MAX_CMDLEN
 *	keystrokes may be bound to an existing less function.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 *
 *	The input file is an ascii file consisting of a 
 *	sequence of lines of the form:
 *		string <whitespace> action [chars] <newline>
 *
 *	"string" is a sequence of command characters which form
 *		the new user-defined command.  The command
 *		characters may be:
 *		1. The actual character itself.
 *		2. A character preceded by ^ to specify a
 *		   control character (e.g. ^X means control-X).
 *		3. A backslash followed by one to three octal digits
 *		   to specify a character by its octal value.
 *		4. A backslash followed by b, e, n, r or t
 *		   to specify \b, ESC, \n, \r or \t, respectively.
 *		5. Any character (other than those mentioned above) preceded 
 *		   by a \ to specify the character itself (characters which
 *		   must be preceded by \ include ^, \, and whitespace.
 *	"action" is the name of a "less" action, from the table below.
 *	"chars" is an optional sequence of characters which is treated
 *		as keyboard input after the command is executed.
 *
 *	Blank lines and lines which start with # are ignored, 
 *	except for the special control lines:
 *		#command	Signals the beginning of the command
 *				keys section.
 *		#line-edit	Signals the beginning of the line-editing
 *				keys section.
 *		#env		Signals the beginning of the environment
 *				variable section.
 *		#stop		Stops command parsing in less;
 *				causes all default keys to be disabled.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 *
 *	The output file is a non-ascii file, consisting of a header,
 *	one or more sections, and a trailer.
 *	Each section begins with a section header, a section length word
 *	and the section data.  Normally there are three sections:
 *		CMD_SECTION	Definition of command keys.
 *		EDIT_SECTION	Definition of editing keys.
 *		END_SECTION	A special section header, with no 
 *				length word or section data.
 *
 *	Section data consists of zero or more byte sequences of the form:
 *		string <0> <action>
 *	or
 *		string <0> <action|A_EXTRA> chars <0>
 *
 *	"string" is the command string.
 *	"<0>" is one null byte.
 *	"<action>" is one byte containing the action code (the A_xxx value).
 *	If action is ORed with A_EXTRA, the action byte is followed
 *		by the null-terminated "chars" string.
 *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
 */

#include "less.h"
#include "lesskey.h"
#include "cmd.h"

struct cmdname
{
	char *cn_name;
	int cn_action;
};

struct cmdname cmdnames[] = 
{
	{ "back-bracket",	A_B_BRACKET },
	{ "back-line",		A_B_LINE },
	{ "back-line-force",	A_BF_LINE },
	{ "back-screen",	A_B_SCREEN },
	{ "back-scroll",	A_B_SCROLL },
	{ "back-search",	A_B_SEARCH },
	{ "back-window",	A_B_WINDOW },
	{ "debug",		A_DEBUG },
	{ "digit",		A_DIGIT },
	{ "display-flag",	A_DISP_OPTION },
	{ "display-option",	A_DISP_OPTION },
	{ "end",		A_GOEND },
	{ "examine",		A_EXAMINE },
	{ "first-cmd",		A_FIRSTCMD },
	{ "firstcmd",		A_FIRSTCMD },
	{ "flush-repaint",	A_FREPAINT },
	{ "forw-bracket",	A_F_BRACKET },
	{ "forw-forever",	A_F_FOREVER },
	{ "forw-line",		A_F_LINE },
	{ "forw-line-force",	A_FF_LINE },
	{ "forw-screen",	A_F_SCREEN },
	{ "forw-screen-force",	A_FF_SCREEN },
	{ "forw-scroll",	A_F_SCROLL },
	{ "forw-search",	A_F_SEARCH },
	{ "forw-window",	A_F_WINDOW },
	{ "goto-end",		A_GOEND },
	{ "goto-line",		A_GOLINE },
	{ "goto-mark",		A_GOMARK },
	{ "help",		A_HELP },
	{ "index-file",		A_INDEX_FILE },
	{ "invalid",		A_UINVALID },
	{ "left-scroll",	A_LSHIFT },
	{ "next-file",		A_NEXT_FILE },
	{ "next-tag",		A_NEXT_TAG },
	{ "noaction",		A_NOACTION },
	{ "percent",		A_PERCENT },
	{ "pipe",		A_PIPE },
	{ "prev-file",		A_PREV_FILE },
	{ "prev-tag",		A_PREV_TAG },
	{ "quit",		A_QUIT },
	{ "remove-file",	A_REMOVE_FILE },
	{ "repaint",		A_REPAINT },
	{ "repaint-flush",	A_FREPAINT },
	{ "repeat-search",	A_AGAIN_SEARCH },
	{ "repeat-search-all",	A_T_AGAIN_SEARCH },
	{ "reverse-search",	A_REVERSE_SEARCH },
	{ "reverse-search-all",	A_T_REVERSE_SEARCH },
	{ "right-scroll",	A_RSHIFT },
	{ "set-mark",		A_SETMARK },
	{ "shell",		A_SHELL },
	{ "status",		A_STAT },
	{ "toggle-flag",	A_OPT_TOGGLE },
	{ "toggle-option",	A_OPT_TOGGLE },
	{ "undo-hilite",	A_UNDO_SEARCH },
	{ "version",		A_VERSION },
	{ "visual",		A_VISUAL },
	{ NULL, 0 }
};

struct cmdname editnames[] = 
{
	{ "back-complete",	EC_B_COMPLETE },
	{ "backspace",		EC_BACKSPACE },
	{ "delete",		EC_DELETE },
	{ "down",		EC_DOWN },
	{ "end",		EC_END },
	{ "expand",		EC_EXPAND },
	{ "forw-complete",	EC_F_COMPLETE },
	{ "home",		EC_HOME },
	{ "insert",		EC_INSERT },
	{ "invalid",		EC_UINVALID },
	{ "kill-line",		EC_LINEKILL },
	{ "left",		EC_LEFT },
	{ "literal",		EC_LITERAL },
	{ "right",		EC_RIGHT },
	{ "up",			EC_UP },
	{ "word-backspace",	EC_W_BACKSPACE },
	{ "word-delete",	EC_W_DELETE },
	{ "word-left",		EC_W_LEFT },
	{ "word-right",		EC_W_RIGHT },
	{ NULL, 0 }
};

struct table
{
	struct cmdname *names;
	char *pbuffer;
	char buffer[MAX_USERCMD];
};

struct table cmdtable;
struct table edittable;
struct table vartable;
struct table *currtable = &cmdtable;

char fileheader[] = {
	C0_LESSKEY_MAGIC, 
	C1_LESSKEY_MAGIC, 
	C2_LESSKEY_MAGIC, 
	C3_LESSKEY_MAGIC
};
char filetrailer[] = {
	C0_END_LESSKEY_MAGIC, 
	C1_END_LESSKEY_MAGIC, 
	C2_END_LESSKEY_MAGIC
};
char cmdsection[1] =	{ CMD_SECTION };
char editsection[1] =	{ EDIT_SECTION };
char varsection[1] =	{ VAR_SECTION };
char endsection[1] =	{ END_SECTION };

char *infile = NULL;
char *outfile = NULL ;

int linenum;
int errors;

extern char version[];

	void
usage()
{
	fprintf(stderr, "usage: lesskey [-o output] [input]\n");
	exit(1);
}

	char *
mkpathname(dirname, filename)
	char *dirname;
	char *filename;
{
	char *pathname;

	pathname = calloc(strlen(dirname) + strlen(filename) + 2, sizeof(char));
	strcpy(pathname, dirname);
	strcat(pathname, PATHNAME_SEP);
	strcat(pathname, filename);
	return (pathname);
}

/*
 * Figure out the name of a default file (in the user's HOME directory).
 */
	char *
homefile(filename)
	char *filename;
{
	char *p;
	char *pathname;

	if ((p = getenv("HOME")) != NULL && *p != '\0')
		pathname = mkpathname(p, filename);
#if OS2
	else if ((p = getenv("INIT")) != NULL && *p != '\0')
		pathname = mkpathname(p, filename);
#endif
	else
	{
		fprintf(stderr, "cannot find $HOME - using current directory\n");
		pathname = mkpathname(".", filename);
	}
	return (pathname);
}

/*
 * Parse command line arguments.
 */
	void
parse_args(argc, argv)
	int argc;
	char **argv;
{
	char *arg;

	outfile = NULL;
	while (--argc > 0)
	{
		arg = *++argv;
		if (arg[0] != '-')
			/* Arg does not start with "-"; it's not an option. */
			break;
		if (arg[1] == '\0')
			/* "-" means standard input. */
			break;
		if (arg[1] == '-' && arg[2] == '\0')
		{
			/* "--" means end of options. */
			argc--;
			argv++;
			break;
		}
		switch (arg[1])
		{
		case '-':
			if (strncmp(arg, "--output", 8) == 0)
			{
				if (arg[8] == '\0')
					outfile = &arg[8];
				else if (arg[8] == '=')
					outfile = &arg[9];
				else
					usage();
				goto opt_o;
			}
			if (strcmp(arg, "--version") == 0)
			{
				goto opt_V;
			}
			usage();
			break;
		case 'o':
			outfile = &argv[0][2];
		opt_o:
			if (*outfile == '\0')
			{
				if (--argc <= 0)
					usage();
				outfile = *(++argv);
			}
			break;
		case 'V':
		opt_V:
			printf("lesskey  version %s\n", version);
			exit(0);
		default:
			usage();
		}
	}
	if (argc > 1)
		usage();
	/*
	 * Open the input file, or use DEF_LESSKEYINFILE if none specified.
	 */
	if (argc > 0)
		infile = *argv;
	else
		infile = homefile(DEF_LESSKEYINFILE);
}

/*
 * Initialize data structures.
 */
	void
init_tables()
{
	cmdtable.names = cmdnames;
	cmdtable.pbuffer = cmdtable.buffer;

	edittable.names = editnames;
	edittable.pbuffer = edittable.buffer;

	vartable.names = NULL;
	vartable.pbuffer = vartable.buffer;
}

/*
 * Parse one character of a string.
 */
	char *
tstr(pp, xlate)
	char **pp;
	int xlate;
{
	register char *p;
	register char ch;
	register int i;
	static char buf[10];
	static char tstr_control_k[] =
		{ SK_SPECIAL_KEY, SK_CONTROL_K, 6, 1, 1, 1, '\0' };

	p = *pp;
	switch (*p)
	{
	case '\\':
		++p;
		switch (*p)
		{
		case '0': case '1': case '2': case '3':
		case '4': case '5': case '6': case '7':
			/*
			 * Parse an octal number.
			 */
			ch = 0;
			i = 0;
			do
				ch = 8*ch + (*p - '0');
			while (*++p >= '0' && *p <= '7' && ++i < 3);
			*pp = p;
			if (xlate && ch == CONTROL('K'))
				return tstr_control_k;
			buf[0] = ch;
			buf[1] = '\0';
			return (buf);
		case 'b':
			*pp = p+1;
			return ("\b");
		case 'e':
			*pp = p+1;
			buf[0] = ESC;
			buf[1] = '\0';
			return (buf);
		case 'n':
			*pp = p+1;
			return ("\n");
		case 'r':
			*pp = p+1;
			return ("\r");
		case 't':
			*pp = p+1;
			return ("\t");
		case 'k':
			if (xlate)
			{
				switch (*++p)
				{
				case 'u': ch = SK_UP_ARROW; break;
				case 'd': ch = SK_DOWN_ARROW; break;
				case 'r': ch = SK_RIGHT_ARROW; break;
				case 'l': ch = SK_LEFT_ARROW; break;
				case 'U': ch = SK_PAGE_UP; break;
				case 'D': ch = SK_PAGE_DOWN; break;
				case 'h': ch = SK_HOME; break;
				case 'e': ch = SK_END; break;
				case 'x': ch = SK_DELETE; break;
				default:
					error("illegal char after \\k");
					*pp = p+1;
					return ("");
				}
				*pp = p+1;
				buf[0] = SK_SPECIAL_KEY;
				buf[1] = ch;
				buf[2] = 6;
				buf[3] = 1;
				buf[4] = 1;
				buf[5] = 1;
				buf[6] = '\0';
				return (buf);
			}
			/* FALLTHRU */
		default:
			/*
			 * Backslash followed by any other char 
			 * just means that char.
			 */
			*pp = p+1;
			buf[0] = *p;
			buf[1] = '\0';
			if (xlate && buf[0] == CONTROL('K'))
				return tstr_control_k;
			return (buf);
		}
	case '^':
		/*
		 * Carat means CONTROL.
		 */
		*pp = p+2;
		buf[0] = CONTROL(p[1]);
		buf[1] = '\0';
		if (buf[0] == CONTROL('K'))
			return tstr_control_k;
		return (buf);
	}
	*pp = p+1;
	buf[0] = *p;
	buf[1] = '\0';
	if (xlate && buf[0] == CONTROL('K'))
		return tstr_control_k;
	return (buf);
}

/*
 * Skip leading spaces in a string.
 */
	public char *
skipsp(s)
	register char *s;
{
	while (*s == ' ' || *s == '\t')	
		s++;
	return (s);
}

/*
 * Skip non-space characters in a string.
 */
	public char *
skipnsp(s)
	register char *s;
{
	while (*s != '\0' && *s != ' ' && *s != '\t')
		s++;
	return (s);
}

/*
 * Clean up an input line:
 * strip off the trailing newline & any trailing # comment.
 */
	char *
clean_line(s)
	char *s;
{
	register int i;

	s = skipsp(s);
	for (i = 0;  s[i] != '\n' && s[i] != '\r' && s[i] != '\0';  i++)
		if (s[i] == '#' && (i == 0 || s[i-1] != '\\'))
			break;
	s[i] = '\0';
	return (s);
}

/*
 * Add a byte to the output command table.
 */
	void
add_cmd_char(c)
	int c;
{
	if (currtable->pbuffer >= currtable->buffer + MAX_USERCMD)
	{
		error("too many commands");
		exit(1);
	}
	*(currtable->pbuffer)++ = c;
}

/*
 * Add a string to the output command table.
 */
	void
add_cmd_str(s)
	char *s;
{
	for ( ;  *s != '\0';  s++)
		add_cmd_char(*s);
}

/*
 * See if we have a special "control" line.
 */
	int
control_line(s)
	char *s;
{
#define	PREFIX(str,pat)	(strncmp(str,pat,strlen(pat)-1) == 0)

	if (PREFIX(s, "#line-edit"))
	{
		currtable = &edittable;
		return (1);
	}
	if (PREFIX(s, "#command"))
	{
		currtable = &cmdtable;
		return (1);
	}
	if (PREFIX(s, "#env"))
	{
		currtable = &vartable;
		return (1);
	}
	if (PREFIX(s, "#stop"))
	{
		add_cmd_char('\0');
		add_cmd_char(A_END_LIST);
		return (1);
	}
	return (0);
}

/*
 * Output some bytes.
 */
	void
fputbytes(fd, buf, len)
	FILE *fd;
	char *buf;
	int len;
{
	while (len-- > 0)
	{
		fwrite(buf, sizeof(char), 1, fd);
		buf++;
	}
}

/*
 * Output an integer, in special KRADIX form.
 */
	void
fputint(fd, val)
	FILE *fd;
	unsigned int val;
{
	char c;

	if (val >= KRADIX*KRADIX)
	{
		fprintf(stderr, "error: integer too big (%d > %d)\n", 
			val, KRADIX*KRADIX);
		exit(1);
	}
	c = val % KRADIX;
	fwrite(&c, sizeof(char), 1, fd);
	c = val / KRADIX;
	fwrite(&c, sizeof(char), 1, fd);
}

/*
 * Find an action, given the name of the action.
 */
	int
findaction(actname)
	char *actname;
{
	int i;

	for (i = 0;  currtable->names[i].cn_name != NULL;  i++)
		if (strcmp(currtable->names[i].cn_name, actname) == 0)
			return (currtable->names[i].cn_action);
	error("unknown action");
	return (A_INVALID);
}

	void
error(s)
	char *s;
{
	fprintf(stderr, "line %d: %s\n", linenum, s);
	errors++;
}


	void
parse_cmdline(p)
	char *p;
{
	int cmdlen;
	char *actname;
	int action;
	char *s;
	char c;

	/*
	 * Parse the command string and store it in the current table.
	 */
	cmdlen = 0;
	do
	{
		s = tstr(&p, 1);
		cmdlen += strlen(s);
		if (cmdlen > MAX_CMDLEN)
			error("command too long");
		else
			add_cmd_str(s);
	} while (*p != ' ' && *p != '\t' && *p != '\0');
	/*
	 * Terminate the command string with a null byte.
	 */
	add_cmd_char('\0');

	/*
	 * Skip white space between the command string
	 * and the action name.
	 * Terminate the action name with a null byte.
	 */
	p = skipsp(p);
	if (*p == '\0')
	{
		error("missing action");
		return;
	}
	actname = p;
	p = skipnsp(p);
	c = *p;
	*p = '\0';

	/*
	 * Parse the action name and store it in the current table.
	 */
	action = findaction(actname);

	/*
	 * See if an extra string follows the action name.
	 */
	*p = c;
	p = skipsp(p);
	if (*p == '\0')
	{
		add_cmd_char(action);
	} else
	{
		/*
		 * OR the special value A_EXTRA into the action byte.
		 * Put the extra string after the action byte.
		 */
		add_cmd_char(action | A_EXTRA);
		while (*p != '\0')
			add_cmd_str(tstr(&p, 0));
		add_cmd_char('\0');
	}
}

	void
parse_varline(p)
	char *p;
{
	char *s;

	do
	{
		s = tstr(&p, 0);
		add_cmd_str(s);
	} while (*p != ' ' && *p != '\t' && *p != '=' && *p != '\0');
	/*
	 * Terminate the variable name with a null byte.
	 */
	add_cmd_char('\0');

	p = skipsp(p);
	if (*p++ != '=')
	{
		error("missing =");
		return;
	}

	add_cmd_char(EV_OK|A_EXTRA);

	p = skipsp(p);
	while (*p != '\0')
	{
		s = tstr(&p, 0);
		add_cmd_str(s);
	}
	add_cmd_char('\0');
}

/*
 * Parse a line from the lesskey file.
 */
	void
parse_line(line)
	char *line;
{
	char *p;

	/*
	 * See if it is a control line.
	 */
	if (control_line(line))
		return;
	/*
	 * Skip leading white space.
	 * Replace the final newline with a null byte.
	 * Ignore blank lines and comments.
	 */
	p = clean_line(line);
	if (*p == '\0')
		return;

	if (currtable == &vartable)
		parse_varline(p);
	else
		parse_cmdline(p);
}

	int
main(argc, argv)
	int argc;
	char *argv[];
{
	FILE *desc;
	FILE *out;
	char line[1024];

#ifdef WIN32
	if (getenv("HOME") == NULL)
	{
		/*
		 * If there is no HOME environment variable,
		 * try the concatenation of HOMEDRIVE + HOMEPATH.
		 */
		char *drive = getenv("HOMEDRIVE");
		char *path  = getenv("HOMEPATH");
		if (drive != NULL && path != NULL)
		{
			char *env = (char *) calloc(strlen(drive) + 
					strlen(path) + 6, sizeof(char));
			strcpy(env, "HOME=");
			strcat(env, drive);
			strcat(env, path);
			putenv(env);
		}
	}
#endif /* WIN32 */

	/*
	 * Process command line arguments.
	 */
	parse_args(argc, argv);
	init_tables();

	/*
	 * Open the input file.
	 */
	if (strcmp(infile, "-") == 0)
		desc = stdin;
	else if ((desc = fopen(infile, "r")) == NULL)
	{
#if HAVE_PERROR
		perror(infile);
#else
		fprintf(stderr, "Cannot open %s\n", infile);
#endif
		usage();
	}

	/*
	 * Read and parse the input file, one line at a time.
	 */
	errors = 0;
	linenum = 0;
	while (fgets(line, sizeof(line), desc) != NULL)
	{
		++linenum;
		parse_line(line);
	}

	/*
	 * Write the output file.
	 * If no output file was specified, use "$HOME/.less"
	 */
	if (errors > 0)
	{
		fprintf(stderr, "%d errors; no output produced\n", errors);
		exit(1);
	}

	if (outfile == NULL)
		outfile = getenv("LESSKEY");
	if (outfile == NULL)
		outfile = homefile(LESSKEYFILE);
	if ((out = fopen(outfile, "wb")) == NULL)
	{
#if HAVE_PERROR
		perror(outfile);
#else
		fprintf(stderr, "Cannot open %s\n", outfile);
#endif
		exit(1);
	}

	/* File header */
	fputbytes(out, fileheader, sizeof(fileheader));

	/* Command key section */
	fputbytes(out, cmdsection, sizeof(cmdsection));
	fputint(out, cmdtable.pbuffer - cmdtable.buffer);
	fputbytes(out, (char *)cmdtable.buffer, cmdtable.pbuffer-cmdtable.buffer);
	/* Edit key section */
	fputbytes(out, editsection, sizeof(editsection));
	fputint(out, edittable.pbuffer - edittable.buffer);
	fputbytes(out, (char *)edittable.buffer, edittable.pbuffer-edittable.buffer);

	/* Environment variable section */
	fputbytes(out, varsection, sizeof(varsection)); 
	fputint(out, vartable.pbuffer - vartable.buffer);
	fputbytes(out, (char *)vartable.buffer, vartable.pbuffer-vartable.buffer);

	/* File trailer */
	fputbytes(out, endsection, sizeof(endsection));
	fputbytes(out, filetrailer, sizeof(filetrailer));
	return (0);
}
OpenPOWER on IntegriCloud