summaryrefslogtreecommitdiffhomepage
path: root/src/internal/argv/argv.h
blob: a674bc9a313b100f8abe52dd2ab55d54a3223a86 (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
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
/****************************************************************************/
/*  argv.h: a thread-safe argument vector parser and usage screen generator */
/*  Copyright (C) 2015--2016  Z. Gilboa                                     */
/*  Released under GPLv2 and GPLv3; see COPYING.NTUX.                       */
/****************************************************************************/

#ifndef ARGV_H
#define ARGV_H

#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#define ARGV_VERBOSITY_NONE		0x00
#define ARGV_VERBOSITY_ERRORS		0x01
#define ARGV_VERBOSITY_STATUS		0x02
#define ARGV_CLONE_VECTOR		0x80

#ifndef ARGV_TAB_WIDTH
#define ARGV_TAB_WIDTH			8
#endif

/*******************************************/
/*                                         */
/* support of hybrid options               */
/* -------------------------               */
/* hybrid options are very similar to      */
/* long options, yet are prefixed by       */
/* a single dash rather than two           */
/* (i.e. -std, -isystem).                  */
/* hybrid options are supported by this    */
/* driver for compatibility with legacy    */
/* tools; note, however, that the use      */
/* of hybrid options should be strongly    */
/* discouraged due to the limitations      */
/* they impose on short options (for       */
/* example, a driver implementing -std     */
/* may not provide -s as a short option    */
/* that takes an arbitrary value).         */
/*                                         */
/* SPACE: -hybrid VALUE (i.e. -MF file)    */
/* EQUAL: -hybrid=VALUE (i.e. -std=c99)    */
/* COMMA: -hybrid,VALUE (i.e. -Wl,<arg>)   */
/* ONLY:  -opt accepted, --opt rejected    */
/* JOINED: -optVALUE                       */
/*                                         */
/*******************************************/


#define ARGV_OPTION_HYBRID_NONE		0x00
#define ARGV_OPTION_HYBRID_ONLY		0x01
#define ARGV_OPTION_HYBRID_SPACE	0x02
#define ARGV_OPTION_HYBRID_EQUAL	0x04
#define ARGV_OPTION_HYBRID_COMMA	0x08
#define ARGV_OPTION_HYBRID_JOINED	0x10
#define ARGV_OPTION_HYBRID_CIRCUS	(ARGV_OPTION_HYBRID_SPACE \
					| ARGV_OPTION_HYBRID_JOINED)
#define ARGV_OPTION_HYBRID_DUAL		(ARGV_OPTION_HYBRID_SPACE \
					| ARGV_OPTION_HYBRID_EQUAL)
#define ARGV_OPTION_HYBRID_SWITCH	(ARGV_OPTION_HYBRID_ONLY \
					| ARGV_OPTION_HYBRID_SPACE \
					| ARGV_OPTION_HYBRID_EQUAL \
					| ARGV_OPTION_HYBRID_COMMA \
					| ARGV_OPTION_HYBRID_JOINED)

enum argv_optarg {
	ARGV_OPTARG_NONE,
	ARGV_OPTARG_REQUIRED,
	ARGV_OPTARG_OPTIONAL,
};

enum argv_mode {
	ARGV_MODE_SCAN,
	ARGV_MODE_COPY,
};

enum argv_error {
	ARGV_ERROR_OK,
	ARGV_ERROR_INTERNAL,
	ARGV_ERROR_SHORT_OPTION,
	ARGV_ERROR_LONG_OPTION,
	ARGV_ERROR_OPTARG_NONE,
	ARGV_ERROR_OPTARG_REQUIRED,
	ARGV_ERROR_OPTARG_PARADIGM,
	ARGV_ERROR_HYBRID_NONE,
	ARGV_ERROR_HYBRID_ONLY,
	ARGV_ERROR_HYBRID_SPACE,
	ARGV_ERROR_HYBRID_EQUAL,
	ARGV_ERROR_HYBRID_COMMA,
};

struct argv_option {
	const char *		long_name;
	const char		short_name;
	int			tag;
	enum argv_optarg	optarg;
	int			flags;
	const char *		paradigm;
	const char *		argname;
	const char *		description;
};

struct argv_entry {
	const char *	arg;
	int		tag;
	bool		fopt;
	bool		fval;
	bool		fnoscan;
	enum argv_error errcode;
};

struct argv_meta {
	char **			argv;
	struct argv_entry *	entries;
};

struct argv_ctx {
	int				flags;
	int				mode;
	int				nentries;
	intptr_t			unitidx;
	intptr_t			erridx;
	enum argv_error 		errcode;
	const char *			errch;
	const struct argv_option *	erropt;
	const char *			program;
};

#ifdef ARGV_DRIVER

struct argv_meta_impl {
	char **			argv;
	char *			strbuf;
	struct argv_meta	meta;
};

static int argv_optv_init(
	const struct argv_option[],
	const struct argv_option **);

static const char * argv_program_name(const char *);

static void argv_usage(
	int		fd,
	const char *	header,
	const struct	argv_option **,
	const char *	mode);

static struct argv_meta * argv_get(
	char **,
	const struct argv_option **,
	int flags,
	int fd);

static void argv_free(struct argv_meta *);

#ifndef argv_dprintf
#define argv_dprintf dprintf
#endif



/*------------------------------------*/
/* implementation of static functions */
/*------------------------------------*/

static int argv_optv_init(
	const struct argv_option	options[],
	const struct argv_option **	optv)
{
	const struct argv_option *	option;
	int				i;

	for (option=options,i=0; option->long_name || option->short_name; option++)
		optv[i++] = option;

	optv[i] = 0;
	return i;
}

static const struct argv_option * argv_short_option(
	const char *			ch,
	const struct argv_option **	optv,
	struct argv_entry *		entry)
{
	const struct argv_option *	option;

	for (; *optv; optv++) {
		option = *optv;

		if (option->short_name == *ch) {
			entry->tag	= option->tag;
			entry->fopt	= true;
			return option;
		}
	}

	return 0;
}

static const struct argv_option * argv_long_option(
	const char *			ch,
	const struct argv_option **	optv,
	struct argv_entry *		entry)
{
	const struct argv_option *	option;
	const char *			arg;
	size_t				len;

	for (; *optv; optv++) {
		option = *optv;
		len    = option->long_name ? strlen(option->long_name) : 0;

		if (len && !(strncmp(option->long_name,ch,len))) {
			arg = ch + len;

			if (!*arg
				|| (*arg == '=')
				|| (option->flags & ARGV_OPTION_HYBRID_JOINED)
				|| ((option->flags & ARGV_OPTION_HYBRID_COMMA)
					&& (*arg == ','))) {
				entry->tag	= option->tag;
				entry->fopt	= true;
				return option;
			}
		}
	}

	return 0;
}

static inline bool is_short_option(const char * arg)
{
	return (arg[0]=='-') && arg[1] && (arg[1]!='-');
}

static inline bool is_long_option(const char * arg)
{
	return (arg[0]=='-') && (arg[1]=='-') && arg[2];
}

static inline bool is_last_option(const char * arg)
{
	return (arg[0]=='-') && (arg[1]=='-') && !arg[2];
}

static inline bool is_hybrid_option(
	const char *			arg,
	const struct argv_option **	optv)
{
	const struct argv_option *	option;
	struct argv_entry		entry;

	if (!is_short_option(arg))
		return false;

	if (!(option = argv_long_option(++arg,optv,&entry)))
		return false;

	if (!(option->flags & ARGV_OPTION_HYBRID_SWITCH))
		if (argv_short_option(arg,optv,&entry))
			return false;

	return true;
}

static inline bool is_arg_in_paradigm(const char * arg, const char * paradigm)
{
	size_t		len;
	const char *	ch;

	for (ch=paradigm,len=strlen(arg); ch; ) {
		if (!strncmp(arg,ch,len)) {
			if (!*(ch += len))
				return true;
			else if (*ch == '|')
				return true;
		}

		if ((ch = strchr(ch,'|')))
			ch++;
	}

	return false;
}

static inline const struct argv_option * option_from_tag(
	const struct argv_option **	optv,
	int				tag)
{
	for (; *optv; optv++)
		if (optv[0]->tag == tag)
			return optv[0];
	return 0;
}

static void argv_scan(
	char **				argv,
	const struct argv_option **	optv,
	struct argv_ctx *		ctx,
	struct argv_meta *		meta)
{
	char **				parg;
	const char *			ch;
	const char *			val;
	const struct argv_option *	option;
	struct argv_entry		entry;
	struct argv_entry *		mentry;
	enum argv_error			ferr;
	bool				fval;
	bool				fnext;
	bool				fshort;
	bool				fhybrid;
	bool				fnoscan;

	parg	= &argv[1];
	ch	= *parg;
	ferr	= ARGV_ERROR_OK;
	fshort	= false;
	fnoscan	= false;
	fval	= false;
	mentry	= meta ? meta->entries : 0;

	ctx->unitidx = 0;
	ctx->erridx  = 0;

	while (ch && (ferr == ARGV_ERROR_OK)) {
		option  = 0;
		fhybrid = false;

		if (fnoscan)
			fval = true;

		else if (is_last_option(ch))
			fnoscan = true;

		else if (!fshort && is_hybrid_option(ch,optv))
			fhybrid = true;

		if (!fnoscan && !fhybrid && (fshort || is_short_option(ch))) {
			if (!fshort)
				ch++;

			if ((option = argv_short_option(ch,optv,&entry))) {
				if (ch[1]) {
					ch++;
					fnext	= false;
					fshort	= (option->optarg == ARGV_OPTARG_NONE);
				} else {
					parg++;
					ch	= *parg;
					fnext	= true;
					fshort	= false;
				}

				if (option->optarg == ARGV_OPTARG_NONE) {
					if (!fnext && ch && (*ch == '-')) {
						ferr = ARGV_ERROR_OPTARG_NONE;
					} else {
						fval = false;
					}

				} else if (!fnext) {
					fval = true;

				} else if (option->optarg == ARGV_OPTARG_REQUIRED) {
					if (ch && is_short_option(ch))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (ch && is_long_option(ch))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (ch && is_last_option(ch))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (ch)
						fval = true;
					else
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
				} else {
					/* ARGV_OPTARG_OPTIONAL */
					if (ch && is_short_option(ch))
						fval = false;
					else if (ch && is_long_option(ch))
						fval = false;
					else if (ch && is_last_option(ch))
						fval = false;
					else if (fnext)
						fval = false;
					else
						fval = ch;
				}
			} else {
				ferr = ARGV_ERROR_SHORT_OPTION;
			}

		} else if (!fnoscan && (fhybrid || is_long_option(ch))) {
			ch += (fhybrid ? 1 : 2);

			if ((option = argv_long_option(ch,optv,&entry))) {
				val = ch + strlen(option->long_name);

				/* val[0] is either '=' (or ',') or '\0' */
				if (!val[0]) {
					parg++;
					ch = *parg;
				}

				if (fhybrid && !(option->flags & ARGV_OPTION_HYBRID_SWITCH))
					ferr = ARGV_ERROR_HYBRID_NONE;
				else if (!fhybrid && (option->flags & ARGV_OPTION_HYBRID_ONLY))
					ferr = ARGV_ERROR_HYBRID_ONLY;
				else if (option->optarg == ARGV_OPTARG_NONE) {
					if (val[0]) {
						ferr = ARGV_ERROR_OPTARG_NONE;
						ctx->errch = val + 1;
					} else
						fval = false;
				} else if (val[0] && (option->flags & ARGV_OPTION_HYBRID_JOINED)) {
					fval = true;
					ch   = val;
				} else if (fhybrid && !val[0] && !(option->flags & ARGV_OPTION_HYBRID_SPACE))
					ferr = ARGV_ERROR_HYBRID_SPACE;
				else if (fhybrid && (val[0]=='=') && !(option->flags & ARGV_OPTION_HYBRID_EQUAL))
					ferr = ARGV_ERROR_HYBRID_EQUAL;
				else if (fhybrid && (val[0]==',') && !(option->flags & ARGV_OPTION_HYBRID_COMMA))
					ferr = ARGV_ERROR_HYBRID_COMMA;
				else if (!fhybrid && (val[0]==','))
					ferr = ARGV_ERROR_HYBRID_COMMA;
				else if (val[0] && !val[1])
					ferr = ARGV_ERROR_OPTARG_REQUIRED;
				else if (val[0] && val[1]) {
					fval = true;
					ch   = ++val;
				} else if (option->optarg == ARGV_OPTARG_REQUIRED) {
					if (!val[0] && !*parg)
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (*parg && is_short_option(*parg))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (*parg && is_long_option(*parg))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else if (*parg && is_last_option(*parg))
						ferr = ARGV_ERROR_OPTARG_REQUIRED;
					else
						fval = true;
				} else {
					/* ARGV_OPTARG_OPTIONAL */
					fval = val[0];
				}
			} else
				ferr = ARGV_ERROR_LONG_OPTION;
		}

		if (ferr == ARGV_ERROR_OK)
			if (option && fval && option->paradigm)
				if (!is_arg_in_paradigm(ch,option->paradigm))
					ferr = ARGV_ERROR_OPTARG_PARADIGM;

		if (ferr == ARGV_ERROR_OK)
			if (!option && !ctx->unitidx)
				ctx->unitidx = parg - argv;

		if (ferr != ARGV_ERROR_OK) {
			ctx->errcode = ferr;
			ctx->errch   = ctx->errch ? ctx->errch : ch;
			ctx->erropt  = option;
			ctx->erridx  = parg - argv;
			return;
		} else if (ctx->mode == ARGV_MODE_SCAN) {
			if (!fnoscan)
				ctx->nentries++;
			else if (fval)
				ctx->nentries++;

			if (fval || !option) {
				parg++;
				ch = *parg;
			}
		} else if (ctx->mode == ARGV_MODE_COPY) {
			if (fnoscan) {
				if (fval) {
					mentry->arg	= ch;
					mentry->fnoscan = true;
					mentry++;
				}

				parg++;
				ch = *parg;
			} else if (option) {
				mentry->arg	= fval ? ch : 0;
				mentry->tag	= option->tag;
				mentry->fopt	= true;
				mentry->fval	= fval;
				mentry++;

				if (fval) {
					parg++;
					ch = *parg;
				}
			} else {
				mentry->arg = ch;
				mentry++;
				parg++;
				ch = *parg;
			}
		}
	}
}

static const char * argv_program_name(const char * program_path)
{
	const char * ch;

	if (program_path) {
		if ((ch = strrchr(program_path,'/')))
			return *(++ch) ? ch : 0;

		if ((ch = strrchr(program_path,'\\')))
			return *(++ch) ? ch : 0;
	}

	return program_path;
}

static void argv_show_error(int fd, struct argv_ctx * ctx)
{
	char opt_short_name[2] = {0,0};

	if (ctx->erropt && ctx->erropt->short_name)
		opt_short_name[0] = ctx->erropt->short_name;

	argv_dprintf(fd,"%s: error: ",ctx->program);

	switch (ctx->errcode) {
		case ARGV_ERROR_SHORT_OPTION:
			argv_dprintf(fd,"'-%c' is not a valid short option\n",*ctx->errch);
			break;

		case ARGV_ERROR_LONG_OPTION:
			argv_dprintf(fd,"'--%s' is not a valid long option\n",ctx->errch);
			break;

		case ARGV_ERROR_OPTARG_NONE:
			argv_dprintf(fd,"'%s' is not a valid option value for [%s%s%s%s%s] "
					"(option values may not be specified)\n",
				ctx->errch,
				opt_short_name[0] ? "-" : "",
				opt_short_name,
				opt_short_name[0] ? "," : "",
				ctx->erropt->long_name ? "--" : "",
				ctx->erropt->long_name);
			break;

		case ARGV_ERROR_OPTARG_REQUIRED:
			argv_dprintf(fd,"option [%s%s%s%s%s] requires %s %s%s%s\n",
				opt_short_name[0] ? "-" : "",
				opt_short_name,
				opt_short_name[0] ? "," : "",
				ctx->erropt->long_name ? "--" : "",
				ctx->erropt->long_name,
				ctx->erropt->paradigm ? "one of the following values:" : "a value",
				ctx->erropt->paradigm ? "{" : "",
				ctx->erropt->paradigm ? ctx->erropt->paradigm : "",
				ctx->erropt->paradigm ? "}" : "");
			break;

		case ARGV_ERROR_OPTARG_PARADIGM:
			argv_dprintf(fd,"'%s' is not a valid option value for [%s%s%s%s%s]={%s}\n",
				ctx->errch,
				opt_short_name[0] ? "-" : "",
				opt_short_name,
				opt_short_name[0] ? "," : "",
				ctx->erropt->long_name ? "--" : "",
				ctx->erropt->long_name,
				ctx->erropt->paradigm);
			break;

		case ARGV_ERROR_HYBRID_NONE:
			argv_dprintf(fd,"-%s is not a synonym for --%s\n",
				ctx->erropt->long_name,
				ctx->erropt->long_name);
			break;

		case ARGV_ERROR_HYBRID_ONLY:
			argv_dprintf(fd,"--%s is not a synonym for -%s\n",
				ctx->erropt->long_name,
				ctx->erropt->long_name);
			break;

		case ARGV_ERROR_HYBRID_SPACE:
		case ARGV_ERROR_HYBRID_EQUAL:
		case ARGV_ERROR_HYBRID_COMMA:
			argv_dprintf(fd,"-%s: illegal value assignment; valid syntax is "
					"-%s%sVAL\n",
				ctx->erropt->long_name,
				ctx->erropt->long_name,
				(ctx->erropt->flags & ARGV_OPTION_HYBRID_SPACE)
					? " " : (ctx->erropt->flags & ARGV_OPTION_HYBRID_EQUAL)
					? "=" : (ctx->erropt->flags & ARGV_OPTION_HYBRID_COMMA)
					? "," : "");

			break;

		case ARGV_ERROR_INTERNAL:
			argv_dprintf(fd,"internal error");
			break;

		default:
			break;
	}
}

static void argv_show_status(
	int				fd,
	const struct argv_option **	optv,
	struct argv_ctx *		ctx,
	struct argv_meta *		meta)
{
	int				argc;
	char **				argv;
	struct argv_entry *		entry;
	const struct argv_option *	option;
	char				short_name[2] = {0};
	const char *			space = "";

	(void)ctx;

	argv_dprintf(fd,"\n\nconcatenated command line:\n");
	for (argv=meta->argv; *argv; argv++) {
		argv_dprintf(fd,"%s%s",space,*argv);
		space = " ";
	}

	argv_dprintf(fd,"\n\nargument vector:\n");
	for (argc=0,argv=meta->argv; *argv; argc++,argv++)
		argv_dprintf(fd,"argv[%d]: %s\n",argc,*argv);

	argv_dprintf(fd,"\n\nparsed entries:\n");
	for (entry=meta->entries; entry->arg || entry->fopt; entry++)
		if (entry->fopt) {
			option = option_from_tag(optv,entry->tag);
			short_name[0] = option->short_name;

			if (entry->fval)
				argv_dprintf(fd,"[-%s,--%s] := %s\n",
					short_name,option->long_name,entry->arg);
			else
				argv_dprintf(fd,"[-%s,--%s]\n",
					short_name,option->long_name);
		} else
			argv_dprintf(fd,"<program arg> := %s\n",entry->arg);

	argv_dprintf(fd,"\n\n");
}

static struct argv_meta * argv_free_impl(struct argv_meta_impl * imeta)
{
	if (imeta->argv)
		free(imeta->argv);

	if (imeta->strbuf)
		free(imeta->strbuf);

	if (imeta->meta.entries)
		free(imeta->meta.entries);

	free(imeta);
	return 0;
}

static struct argv_meta * argv_alloc(char ** argv, struct argv_ctx * ctx)
{
	struct argv_meta_impl * imeta;
	char **			vector;
	char *			dst;
	size_t			size;
	int			argc;
	int			i;

	if (!(imeta = calloc(1,sizeof(*imeta))))
		return 0;

	if (ctx->flags & ARGV_CLONE_VECTOR) {
		for (vector=argv,argc=0,size=0; *vector; vector++) {
			size += strlen(*vector) + 1;
			argc++;
		}

		if (!(imeta->argv = calloc(argc+1,sizeof(char *))))
			return argv_free_impl(imeta);
		else if (!(imeta->strbuf = calloc(1,size+1)))
			return argv_free_impl(imeta);

		for (i=0,dst=imeta->strbuf; i<argc; i++) {
			strcpy(dst,argv[i]);
			imeta->argv[i] = dst;
			dst += strlen(dst)+1;
		}

		imeta->meta.argv = imeta->argv;
	} else
		imeta->meta.argv = argv;

	if (!(imeta->meta.entries = calloc(
				ctx->nentries+1,
				sizeof(struct argv_entry))))
		return argv_free_impl(imeta);
	else
		return &imeta->meta;
}

static struct argv_meta * argv_get(
	char **				argv,
	const struct argv_option **	optv,
	int				flags,
	int				fd)
{
	struct argv_meta *	meta;
	struct argv_ctx		ctx = {flags,ARGV_MODE_SCAN,0,0,0,0,0,0,0};

	argv_scan(argv,optv,&ctx,0);

	if (ctx.errcode != ARGV_ERROR_OK) {
		ctx.program = argv_program_name(argv[0]);

		if (ctx.flags & ARGV_VERBOSITY_ERRORS)
			argv_show_error(fd,&ctx);

		return 0;
	}

	if (!(meta = argv_alloc(argv,&ctx)))
		return 0;

	ctx.mode = ARGV_MODE_COPY;
	argv_scan(meta->argv,optv,&ctx,meta);

	if (ctx.errcode != ARGV_ERROR_OK) {
		ctx.program = argv[0];
		ctx.errcode = ARGV_ERROR_INTERNAL;
		argv_show_error(fd,&ctx);
		argv_free(meta);

		return 0;
	}

	if (ctx.flags & ARGV_VERBOSITY_STATUS)
		argv_show_status(fd,optv,&ctx,meta);

	return meta;
}

static void argv_free(struct argv_meta * xmeta)
{
	struct argv_meta_impl * imeta;
	uintptr_t		addr;

	if (xmeta) {
		addr  = (uintptr_t)xmeta - offsetof(struct argv_meta_impl,meta);
		imeta = (struct argv_meta_impl *)addr;
		argv_free_impl(imeta);
	}
}

static void argv_usage(
	int				fd,
	const char *    		header,
	const struct argv_option **	options,
	const char *			mode)
{
	const struct argv_option **	optv;
	const struct argv_option *	option;
	bool				fshort,flong,fboth;
	size_t				len,optlen,desclen;
	char				cache;
	char *				prefix;
	char *				desc;
	char *				mark;
	char *				cap;
	char				description[4096];
	char				optstr     [72];
	const size_t			optcap    = 64;
	const size_t			width     = 80;
	const char			indent[]  = "  ";
	const char			creset[]  = "\x1b[0m";
	const char			cbold []  = "\x1b[1m";
	const char			cgreen[]  = "\x1b[32m";
	const char			cblue []  = "\x1b[34m";
	const char			ccyan []  = "\x1b[36m";
	const char *			color     = ccyan;
	bool				fcolor;

	fshort = mode ? !strcmp(mode,"short") : 0;
	flong  = fshort ? 0 : mode && !strcmp(mode,"long");
	fboth  = !fshort && !flong;
	fcolor = isatty(fd);

	if (fcolor)
		argv_dprintf(fd,"%s%s",cbold,cgreen);

	if (header)
		argv_dprintf(fd,"%s",header);

	for (optlen=0,optv=options; *optv; optv++) {
		option = *optv;

		/* indent + comma */
		len = fboth ? sizeof(indent) + 1 : sizeof(indent);

		/* -o */
		if (fshort || fboth)
			len += option->short_name
				? 2 : 0;

		/* --option */
		if (flong || fboth)
			len += option->long_name
				? 2 + strlen(option->long_name) : 0;

		/* optlen */
		if (len > optlen)
			optlen = len;
	}

	if (optlen >= optcap) {
		argv_dprintf(fd,
			"Option strings exceed %zu characters, "
			"please generate the usage screen manually.\n",
			optcap);
		return;
	}

	optlen += ARGV_TAB_WIDTH;
	optlen &= (~(ARGV_TAB_WIDTH-1));
	desclen = (optlen < width / 2) ? width - optlen : optlen;

	for (optv=options; *optv; optv++) {
		option = *optv;

		/* color */
		if (fcolor) {
			color = (color == ccyan) ? cblue : ccyan;
			argv_dprintf(fd,color);
		}

		/* description, using either paradigm or argname if applicable */
		snprintf(description,sizeof(description),option->description,
			option->paradigm
				? option->paradigm
				: option->argname ? option->argname : "");
		description[sizeof(description)-1] = 0;

		/* long/hybrid option prefix (-/--) */
		prefix = option->flags & ARGV_OPTION_HYBRID_ONLY
				? " -" : "--";

		/* option string */
		if (fboth && option->short_name && option->long_name)
			sprintf(optstr,"%s-%c,%s%s",
				indent,option->short_name,prefix,option->long_name);

		else if ((fshort || fboth) && option->short_name)
			sprintf(optstr,"%s-%c",indent,option->short_name);

		else if (flong && option->long_name)
			sprintf(optstr,"%s%s%s",
				indent,prefix,option->long_name);

		else if (fboth && option->long_name)
			sprintf(optstr,"%s   %s%s",
				indent,prefix,option->long_name);

		else
			optstr[0] = 0;

		/* right-indented option buffer */
		if (description[0]) {
			len = strlen(optstr);
			sprintf(&optstr[len],"%-*c",(int)(optlen-len),' ');
		}

		/* single line? */
		if (optlen + strlen(description) < width) {
			argv_dprintf(fd,"%s%s\n",optstr,description);

		} else {
			desc = description;
			cap  = desc + strlen(description);

			while (desc < cap) {
				mark = (desc + desclen >= cap)
					? cap : desc + desclen;

				while (*mark && (mark > desc)
						&& (*mark != ' ')
						&& (*mark != '|')
						&& (*mark != '\t')
						&& (*mark != '\n'))
					mark--;

				if (mark == desc) {
					mark = (desc + desclen >= cap)
						? cap : desc + desclen;
					cache = *mark;
					*mark = 0;
				} else if (*mark == '|') {
					cache = *mark;
					*mark = 0;
				} else {
					cache = 0;
					*mark = 0;
				}

				/* first line? */
				if (desc == description)
					argv_dprintf(fd,"%s%s\n",optstr,desc);
				else
					argv_dprintf(fd,"%-*c %s\n",
						(*desc == '|')
							? (int)(optlen+1)
							: (int)optlen,
						' ',desc);

				if (cache)
					*mark = cache;
				else
					mark++;

				desc = mark;
			}
		}
	}

	if (fcolor)
		argv_dprintf(fd,creset);
}

#endif

#endif