summaryrefslogtreecommitdiff
path: root/ls.c
blob: 64e5bf828e3c40ac5f8a29ab35b9ac6d87e40147 (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
/* vi: set sw=4 ts=4: */
/*
 * tiny-ls.c version 0.1.0: A minimalist 'ls'
 * Copyright (C) 1996 Brian Candler <B.Candler@pobox.com>
 *
 *  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
 *  (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * To achieve a small memory footprint, this version of 'ls' doesn't do any
 * file sorting, and only has the most essential command line switches
 * (i.e. the ones I couldn't live without :-) All features which involve
 * linking in substantial chunks of libc can be disabled.
 *
 * Although I don't really want to add new features to this program to
 * keep it small, I *am* interested to receive bug fixes and ways to make
 * it more portable.
 *
 * KNOWN BUGS:
 * 1. ls -l of a directory doesn't give "total <blocks>" header
 * 2. ls of a symlink to a directory doesn't list directory contents
 * 3. hidden files can make column width too large
 *
 * NON-OPTIMAL BEHAVIOUR:
 * 1. autowidth reads directories twice
 * 2. if you do a short directory listing without filetype characters
 *    appended, there's no need to stat each one
 * PORTABILITY:
 * 1. requires lstat (BSD) - how do you do it without?
 */

static const int TERMINAL_WIDTH = 80;		/* use 79 if your terminal has linefold bug */
static const int COLUMN_WIDTH = 14;		/* default if AUTOWIDTH not defined */
static const int COLUMN_GAP = 2;			/* includes the file type char, if present */

/************************************************************************/

#include "busybox.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#ifdef BB_FEATURE_LS_TIMESTAMPS
#include <time.h>
#endif
#include <string.h>

#ifndef NAJOR
#define MAJOR(dev) (((dev)>>8)&0xff)
#define MINOR(dev) ((dev)&0xff)
#endif

/* what is the overall style of the listing */
enum {
STYLE_AUTO = 0,
STYLE_LONG = 1,		/* one record per line, extended info */
STYLE_SINGLE = 2,		/* one record per line */
STYLE_COLUMNS = 3		/* fill columns */
};

/* 51306 lrwxrwxrwx  1 root     root         2 May 11 01:43 /bin/view -> vi* */
/* what file information will be listed */
#define LIST_INO		(1<<0)
#define LIST_BLOCKS		(1<<1)
#define LIST_MODEBITS	(1<<2)
#define LIST_NLINKS		(1<<3)
#define LIST_ID_NAME	(1<<4)
#define LIST_ID_NUMERIC	(1<<5)
#define LIST_SIZE		(1<<6)
#define LIST_DEV		(1<<7)
#define LIST_DATE_TIME	(1<<8)
#define LIST_FULLTIME	(1<<9)
#define LIST_FILENAME	(1<<10)
#define LIST_SYMLINK	(1<<11)
#define LIST_FILETYPE	(1<<12)
#define LIST_EXEC		(1<<13)

/* what files will be displayed */
#define DISP_NORMAL		(0)		/* show normal filenames */
#define DISP_DIRNAME	(1<<0)	/* 2 or more items? label directories */
#define DISP_HIDDEN		(1<<1)	/* show filenames starting with .  */
#define DISP_DOT		(1<<2)	/* show . and .. */
#define DISP_NOLIST		(1<<3)	/* show directory as itself, not contents */
#define DISP_RECURSIVE	(1<<4)	/* show directory and everything below it */
#define DISP_ROWS		(1<<5)	/* print across rows */

#ifdef BB_FEATURE_LS_SORTFILES
/* how will the files be sorted */
static const int SORT_FORWARD = 0;		/* sort in reverse order */
static const int SORT_REVERSE = 1;		/* sort in reverse order */
static const int SORT_NAME = 2;		/* sort by file name */
static const int SORT_SIZE = 3;		/* sort by file size */
static const int SORT_ATIME = 4;		/* sort by last access time */
static const int SORT_CTIME = 5;		/* sort by last change time */
static const int SORT_MTIME = 6;		/* sort by last modification time */
static const int SORT_VERSION = 7;		/* sort by version */
static const int SORT_EXT = 8;		/* sort by file name extension */
static const int SORT_DIR = 9;		/* sort by file or directory */
#endif

#ifdef BB_FEATURE_LS_TIMESTAMPS
/* which of the three times will be used */
static const int TIME_MOD = 0;
static const int TIME_CHANGE = 1;
static const int TIME_ACCESS = 2;
#endif

#define LIST_SHORT		(LIST_FILENAME)
#define LIST_ISHORT		(LIST_INO | LIST_FILENAME)
#define LIST_LONG		(LIST_MODEBITS | LIST_NLINKS | LIST_ID_NAME | \
						LIST_SIZE | LIST_DATE_TIME | LIST_FILENAME | \
						LIST_SYMLINK)
#define LIST_ILONG		(LIST_INO | LIST_LONG)

static const int SPLIT_DIR = 0;
static const int SPLIT_FILE = 1;
static const int SPLIT_SUBDIR = 2;

#define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
#define TYPECHAR(mode)  ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
#ifdef BB_FEATURE_LS_FILETYPES
#define APPCHAR(mode)   ("\0|\0\0/\0\0\0\0\0@\0=\0\0\0" [TYPEINDEX(mode)])
#endif

/*
 * a directory entry and its stat info are stored here
 */
struct dnode {				/* the basic node */
    char *name;				/* the dir entry name */
    char *fullname;			/* the dir entry name */
    struct stat dstat;		/* the file stat info */
    struct dnode *next;		/* point at the next node */
};
typedef struct dnode dnode_t;

struct dnode **list_dir(char *);
struct dnode **dnalloc(int);
int list_single(struct dnode *);

static unsigned int disp_opts;
static unsigned int style_fmt;
static unsigned int list_fmt;
#ifdef BB_FEATURE_LS_SORTFILES
static unsigned int sort_opts;
static unsigned int sort_order;
#endif
#ifdef BB_FEATURE_LS_TIMESTAMPS
static unsigned int time_fmt;
#endif
#ifdef BB_FEATURE_LS_FOLLOWLINKS
static unsigned int follow_links=FALSE;
#endif

static unsigned short column = 0;
#ifdef BB_FEATURE_AUTOWIDTH
static unsigned short terminal_width;
static unsigned short column_width;
static unsigned short tabstops;
#else
# define column_width	COLUMN_WIDTH 
#endif

static int status = EXIT_SUCCESS;

#ifdef BB_FEATURE_HUMAN_READABLE
unsigned long ls_disp_hr = KILOBYTE;
#endif

static int my_stat(struct dnode *cur)
{
#ifdef BB_FEATURE_LS_FOLLOWLINKS
	if (follow_links == TRUE) {
		if (stat(cur->fullname, &cur->dstat)) {
			perror_msg("%s", cur->fullname);
			status = EXIT_FAILURE;
			free(cur->fullname);
			free(cur);
			return -1;
		}
	} else
#endif
	if (lstat(cur->fullname, &cur->dstat)) {
		perror_msg("%s", cur->fullname);
		status = EXIT_FAILURE;
		free(cur->fullname);
		free(cur);
		return -1;
	}
	return 0;
}

static void newline(void)
{
    if (column > 0) {
        putchar('\n');
        column = 0;
    }
}

/*----------------------------------------------------------------------*/
#ifdef BB_FEATURE_LS_FILETYPES
static char append_char(mode_t mode)
{
	if ( !(list_fmt & LIST_FILETYPE))
		return '\0';
	if ((list_fmt & LIST_EXEC) && S_ISREG(mode)
	    && (mode & (S_IXUSR | S_IXGRP | S_IXOTH))) return '*';
		return APPCHAR(mode);
}
#endif

/*----------------------------------------------------------------------*/
static void nexttabstop( void )
{
	static short nexttab= 0;
	int n=0;

	if (column > 0) {
		n= nexttab - column;
		if (n < 1) n= 1;
		while (n--) {
			putchar(' ');
			column++;
		}
	}
	nexttab= column + column_width + COLUMN_GAP; 
}

/*----------------------------------------------------------------------*/
static int is_subdir(struct dnode *dn)
{
	return (S_ISDIR(dn->dstat.st_mode) && strcmp(dn->name, ".") != 0 &&
			strcmp(dn->name, "..") != 0);
}

int countdirs(struct dnode **dn, int nfiles)
{
	int i, dirs;

	if (dn==NULL || nfiles < 1) return(0);
	dirs= 0;
	for (i=0; i<nfiles; i++) {
		if (S_ISDIR(dn[i]->dstat.st_mode)) dirs++;
	}
	return(dirs);
}

int countsubdirs(struct dnode **dn, int nfiles)
{
	int i, subdirs;

	if (dn == NULL || nfiles < 1) return 0;
	subdirs = 0;
	for (i = 0; i < nfiles; i++)
		if (is_subdir(dn[i]))
			subdirs++;
	return subdirs;
}

int countfiles(struct dnode **dnp)
{
	int nfiles;
	struct dnode *cur;

	if (dnp == NULL) return(0);
	nfiles= 0;
	for (cur= dnp[0];  cur->next != NULL ; cur= cur->next) nfiles++;
	nfiles++;
	return(nfiles);
}

/* get memory to hold an array of pointers */
struct dnode **dnalloc(int num)
{
	struct dnode **p;

	if (num < 1) return(NULL);

	p= (struct dnode **)xcalloc((size_t)num, (size_t)(sizeof(struct dnode *)));
	return(p);
}

void dfree(struct dnode **dnp)
{
	struct dnode *cur, *next;

	if(dnp == NULL) return;

	cur=dnp[0];
	while (cur != NULL) {
		if (cur->fullname != NULL) free(cur->fullname);	/* free the filename */
		next= cur->next;
		free(cur);				/* free the dnode */
		cur= next;
	}
	free(dnp);	/* free the array holding the dnode pointers */
}

struct dnode **splitdnarray(struct dnode **dn, int nfiles, int which)
{
	int dncnt, i, d;
	struct dnode **dnp;

	if (dn==NULL || nfiles < 1) return(NULL);

	/* count how many dirs and regular files there are */
	if (which == SPLIT_SUBDIR)
		dncnt = countsubdirs(dn, nfiles);
	else {
		dncnt= countdirs(dn, nfiles); /* assume we are looking for dirs */
		if (which == SPLIT_FILE)
			dncnt= nfiles - dncnt;  /* looking for files */
	}

	/* allocate a file array and a dir array */
	dnp= dnalloc(dncnt);

	/* copy the entrys into the file or dir array */
	for (d= i=0; i<nfiles; i++) {
		if (which == SPLIT_DIR) {
			if (S_ISDIR(dn[i]->dstat.st_mode)) {
				dnp[d++]= dn[i];
			}  /* else skip the file */
		} else if (which == SPLIT_SUBDIR) {
			if (is_subdir(dn[i])) {
				dnp[d++]= dn[i];
			}  /* else skip the file or dir */
		} else {
			if (!(S_ISDIR(dn[i]->dstat.st_mode))) {
				dnp[d++]= dn[i];
			}  /* else skip the dir */
		}
	}
	return(dnp);
}

/*----------------------------------------------------------------------*/
#ifdef BB_FEATURE_LS_SORTFILES
int sortcmp(struct dnode *d1, struct dnode *d2)
{
	int cmp, dif;

	cmp= 0;
	if (sort_opts == SORT_SIZE) {
		dif= (int)(d1->dstat.st_size - d2->dstat.st_size);
	} else if (sort_opts == SORT_ATIME) {
		dif= (int)(d1->dstat.st_atime - d2->dstat.st_atime);
	} else if (sort_opts == SORT_CTIME) {
		dif= (int)(d1->dstat.st_ctime - d2->dstat.st_ctime);
	} else if (sort_opts == SORT_MTIME) {
		dif= (int)(d1->dstat.st_mtime - d2->dstat.st_mtime);
	} else if (sort_opts == SORT_DIR) {
		dif= S_ISDIR(d1->dstat.st_mode) - S_ISDIR(d2->dstat.st_mode);
	/* } else if (sort_opts == SORT_VERSION) { */
	/* } else if (sort_opts == SORT_EXT) { */
	} else {    /* assume SORT_NAME */
		dif= 0;
	}

	if (dif > 0) cmp= -1;
	if (dif < 0) cmp=  1;
	if (dif == 0) {
		/* sort by name- may be a tie_breaker for time or size cmp */
		dif= strcmp(d1->name, d2->name);
		if (dif > 0) cmp=  1;
		if (dif < 0) cmp= -1;
	}

	if (sort_order == SORT_REVERSE) {
		cmp=  -1 * cmp;
	}
	return(cmp);
}

/*----------------------------------------------------------------------*/
void shellsort(struct dnode **dn, int size)
{
	struct dnode *temp;
	int gap, i, j;

	/* shell short the array */
	if(dn==NULL || size < 2) return;

	for (gap= size/2; gap>0; gap /=2) {
		for (i=gap; i<size; i++) {
			for (j= i-gap; j>=0; j-=gap) {
				if (sortcmp(dn[j], dn[j+gap]) <= 0)
					break;
				/* they are out of order, swap them */
				temp= dn[j];
				dn[j]= dn[j+gap];
				dn[j+gap]= temp;
			}
		}
	}
}
#endif

/*----------------------------------------------------------------------*/
void showfiles(struct dnode **dn, int nfiles)
{
	int i, ncols, nrows, row, nc;
#ifdef BB_FEATURE_AUTOWIDTH
	int len;
#endif

	if(dn==NULL || nfiles < 1) return;

#ifdef BB_FEATURE_AUTOWIDTH
	/* find the longest file name-  use that as the column width */
	column_width= 0;
	for (i=0; i<nfiles; i++) {
		len= strlen(dn[i]->name) +
			((list_fmt & LIST_INO) ? 8 : 0) +
			((list_fmt & LIST_BLOCKS) ? 5 : 0)
			;
		if (column_width < len) column_width= len;
	}
	ncols= (int)(terminal_width / (column_width + COLUMN_GAP));
#else
	ncols= TERMINAL_WIDTH;
#endif
	switch (style_fmt) {
		case STYLE_LONG:	/* one record per line, extended info */
		case STYLE_SINGLE:	/* one record per line */
			ncols= 1;
			break;
	}

	nrows= nfiles / ncols;
	if ((nrows * ncols) < nfiles) nrows++; /* round up fractionals */

	if (nrows > nfiles) nrows= nfiles;
	for (row=0; row<nrows; row++) {
		for (nc=0; nc<ncols; nc++) {
			/* reach into the array based on the column and row */
			i= (nc * nrows) + row;		/* assume display by column */
			if (disp_opts & DISP_ROWS)
				i= (row * ncols) + nc;	/* display across row */
			if (i < nfiles) {
				nexttabstop();
				list_single(dn[i]);
			}
		}
		newline();
	}
}

/*----------------------------------------------------------------------*/
void showdirs(struct dnode **dn, int ndirs)
{
	int i, nfiles;
	struct dnode **subdnp;
#ifdef BB_FEATURE_LS_RECURSIVE
	int dndirs;
	struct dnode **dnd;
#endif

	if (dn==NULL || ndirs < 1) return;

	for (i=0; i<ndirs; i++) {
		if (disp_opts & (DISP_DIRNAME | DISP_RECURSIVE)) {
			printf("\n%s:\n", dn[i]->fullname);
		}
		subdnp= list_dir(dn[i]->fullname);
		nfiles= countfiles(subdnp);
		if (nfiles > 0) {
			/* list all files at this level */
#ifdef BB_FEATURE_LS_SORTFILES
			shellsort(subdnp, nfiles);
#endif
			showfiles(subdnp, nfiles);
#ifdef BB_FEATURE_LS_RECURSIVE
			if (disp_opts & DISP_RECURSIVE) {
				/* recursive- list the sub-dirs */
				dnd= splitdnarray(subdnp, nfiles, SPLIT_SUBDIR);
				dndirs= countsubdirs(subdnp, nfiles);
				if (dndirs > 0) {
#ifdef BB_FEATURE_LS_SORTFILES
					shellsort(dnd, dndirs);
#endif
					showdirs(dnd, dndirs);
					free(dnd);  /* free the array of dnode pointers to the dirs */
				}
			}
			dfree(subdnp);  /* free the dnodes and the fullname mem */
#endif
		}
	}
}

/*----------------------------------------------------------------------*/
struct dnode **list_dir(char *path)
{
	struct dnode *dn, *cur, **dnp;
	struct dirent *entry;
	DIR *dir;
	int i, nfiles;

	if (path==NULL) return(NULL);

	dn= NULL;
	nfiles= 0;
	dir = opendir(path);
	if (dir == NULL) {
		perror_msg("%s", path);
		status = EXIT_FAILURE;
		return(NULL);	/* could not open the dir */
	}
	while ((entry = readdir(dir)) != NULL) {
		/* are we going to list the file- it may be . or .. or a hidden file */
		if ((strcmp(entry->d_name, ".")==0) && !(disp_opts & DISP_DOT)) continue;
		if ((strcmp(entry->d_name, "..")==0) && !(disp_opts & DISP_DOT)) continue;
		if ((entry->d_name[0] ==  '.') && !(disp_opts & DISP_HIDDEN)) continue;
		cur= (struct dnode *)xmalloc(sizeof(struct dnode));
		cur->fullname = xmalloc(strlen(path)+1+strlen(entry->d_name)+1);
		strcpy(cur->fullname, path);
		if (cur->fullname[strlen(cur->fullname)-1] != '/')
			strcat(cur->fullname, "/");
		cur->name= cur->fullname + strlen(cur->fullname);
		strcat(cur->fullname, entry->d_name);
		if (my_stat(cur))
			continue;
		cur->next= dn;
		dn= cur;
		nfiles++;
	}
	closedir(dir);

	/* now that we know how many files there are
	** allocate memory for an array to hold dnode pointers
	*/
	if (nfiles < 1) return(NULL);
	dnp= dnalloc(nfiles);
	for (i=0, cur=dn; i<nfiles; i++) {
		dnp[i]= cur;   /* save pointer to node in array */
		cur= cur->next;
	}

	return(dnp);
}

/*----------------------------------------------------------------------*/
int list_single(struct dnode *dn)
{
	int i, len;
	char scratch[BUFSIZ + 1];
#ifdef BB_FEATURE_LS_TIMESTAMPS
	char *filetime;
	time_t ttime, age;
#endif
#if defined (BB_FEATURE_LS_FILETYPES)
	struct stat info;
#endif
#ifdef BB_FEATURE_LS_FILETYPES
	char append;
#endif

	if (dn==NULL || dn->fullname==NULL) return(0);

#ifdef BB_FEATURE_LS_TIMESTAMPS
	ttime= dn->dstat.st_mtime;      /* the default time */
	if (time_fmt & TIME_ACCESS) ttime= dn->dstat.st_atime;
	if (time_fmt & TIME_CHANGE) ttime= dn->dstat.st_ctime;
	filetime= ctime(&ttime);
#endif
#ifdef BB_FEATURE_LS_FILETYPES
	append = append_char(dn->dstat.st_mode);
#endif

	for (i=0; i<=31; i++) {
		switch (list_fmt & (1<<i)) {
			case LIST_INO:
				printf("%7ld ", dn->dstat.st_ino);
				column += 8;
				break;
			case LIST_BLOCKS:
#ifdef BB_FEATURE_HUMAN_READABLE
				fprintf(stdout, "%5s ", format(dn->dstat.st_size, ls_disp_hr));
#else
#if _FILE_OFFSET_BITS == 64
				printf("%4lld ", dn->dstat.st_blocks>>1);
#else
				printf("%4ld ", dn->dstat.st_blocks>>1);
#endif
#endif
				column += 5;
				break;
			case LIST_MODEBITS:
				printf("%10s", (char *)mode_string(dn->dstat.st_mode));
				column += 10;
				break;
			case LIST_NLINKS:
				printf("%4d ", dn->dstat.st_nlink);
				column += 10;
				break;
			case LIST_ID_NAME:
#ifdef BB_FEATURE_LS_USERNAME
				my_getpwuid(scratch, dn->dstat.st_uid);
				if (*scratch)
					printf("%-8.8s ", scratch);
				else
					printf("%-8d ", dn->dstat.st_uid);
				my_getgrgid(scratch, dn->dstat.st_gid);
				if (*scratch)
					printf("%-8.8s", scratch);
				else
					printf("%-8d", dn->dstat.st_gid);
				column += 17;
				break;
#endif
			case LIST_ID_NUMERIC:
				printf("%-8d %-8d", dn->dstat.st_uid, dn->dstat.st_gid);
				column += 17;
				break;
			case LIST_SIZE:
			case LIST_DEV:
				if (S_ISBLK(dn->dstat.st_mode) || S_ISCHR(dn->dstat.st_mode)) {
					printf("%4d, %3d ", (int)MAJOR(dn->dstat.st_rdev), (int)MINOR(dn->dstat.st_rdev));
				} else {
#ifdef BB_FEATURE_HUMAN_READABLE
					fprintf(stdout, "%9s ", format(dn->dstat.st_size, ls_disp_hr));
#else
#if _FILE_OFFSET_BITS == 64
					printf("%9lld ", dn->dstat.st_size);
#else
					printf("%9ld ", dn->dstat.st_size);
#endif
#endif
				}
				column += 10;
				break;
#ifdef BB_FEATURE_LS_TIMESTAMPS
			case LIST_FULLTIME:
			case LIST_DATE_TIME:
				if (list_fmt & LIST_FULLTIME) {
					printf("%24.24s ", filetime);
					column += 25;
					break;
				}
				age = time(NULL) - ttime;
				printf("%6.6s ", filetime+4);
				if (age < 3600L * 24 * 365 / 2 && age > -15 * 60) {
					/* hh:mm if less than 6 months old */
					printf("%5.5s ", filetime+11);
				} else {
					printf(" %4.4s ", filetime+20);
				}
				column += 13;
				break;
#endif
			case LIST_FILENAME:
				printf("%s", dn->name);
				column += strlen(dn->name);
				break;
			case LIST_SYMLINK:
				if (S_ISLNK(dn->dstat.st_mode)) {
					len= readlink(dn->fullname, scratch, (sizeof scratch)-1);
					if (len > 0) {
						scratch[len]= '\0';
						printf(" -> %s", scratch);
#ifdef BB_FEATURE_LS_FILETYPES
						if (!stat(dn->fullname, &info)) {
							append = append_char(info.st_mode);
						}
#endif
						column += len+4;
					}
				}
				break;
#ifdef BB_FEATURE_LS_FILETYPES
			case LIST_FILETYPE:
				if (append != '\0') {
					printf("%1c", append);
					column++;
				}
				break;
#endif
		}
	}

	return(0);
}

/*----------------------------------------------------------------------*/
extern int ls_main(int argc, char **argv)
{
	struct dnode **dnf, **dnd;
	int dnfiles, dndirs;
	struct dnode *dn, *cur, **dnp;
	int i, nfiles;
	int opt;
	int oi, ac;
	char **av;

	disp_opts= DISP_NORMAL;
	style_fmt= STYLE_AUTO;
	list_fmt=  LIST_SHORT;
#ifdef BB_FEATURE_LS_SORTFILES
	sort_opts= SORT_NAME;
	sort_order=	SORT_FORWARD;
#endif
#ifdef BB_FEATURE_LS_TIMESTAMPS
	time_fmt= TIME_MOD;
#endif
#ifdef BB_FEATURE_AUTOWIDTH
	terminal_width = TERMINAL_WIDTH;
	column_width = COLUMN_WIDTH;
	tabstops = 8;
#endif
	nfiles=0;

	/* process options */
	while ((opt = getopt(argc, argv, "1AaCdgilnsx"
#ifdef BB_FEATURE_AUTOWIDTH
"T:w:"
#endif
#ifdef BB_FEATURE_LS_FILETYPES
"Fp"
#endif
#ifdef BB_FEATURE_LS_RECURSIVE
"R"
#endif
#ifdef BB_FEATURE_LS_SORTFILES
"rSvX"
#endif
#ifdef BB_FEATURE_LS_TIMESTAMPS
"cetu"
#endif
#ifdef BB_FEATURE_LS_FOLLOWLINKS
"L"
#endif
#ifdef BB_FEATURE_HUMAN_READABLE
"h"
#endif
"k")) > 0) {
		switch (opt) {
			case '1': style_fmt = STYLE_SINGLE; break;
			case 'A': disp_opts |= DISP_HIDDEN; break;
			case 'a': disp_opts |= DISP_HIDDEN | DISP_DOT; break;
			case 'C': style_fmt = STYLE_COLUMNS; break;
			case 'd': disp_opts |= DISP_NOLIST; break;
			case 'g': /* ignore -- for ftp servers */ break;
			case 'i': list_fmt |= LIST_INO; break;
			case 'l':
				style_fmt = STYLE_LONG;
				list_fmt |= LIST_LONG;
#ifdef BB_FEATURE_HUMAN_READABLE
				ls_disp_hr = 1;
#endif
			break;
			case 'n': list_fmt |= LIST_ID_NUMERIC; break;
			case 's': list_fmt |= LIST_BLOCKS; break;
			case 'x': disp_opts = DISP_ROWS; break;
#ifdef BB_FEATURE_LS_FILETYPES
			case 'F': list_fmt |= LIST_FILETYPE | LIST_EXEC; break;
			case 'p': list_fmt |= LIST_FILETYPE; break;
#endif
#ifdef BB_FEATURE_LS_RECURSIVE
			case 'R': disp_opts |= DISP_RECURSIVE; break;
#endif
#ifdef BB_FEATURE_LS_SORTFILES
			case 'r': sort_order |= SORT_REVERSE; break;
			case 'S': sort_opts= SORT_SIZE; break;
			case 'v': sort_opts= SORT_VERSION; break;
			case 'X': sort_opts= SORT_EXT; break;
#endif
#ifdef BB_FEATURE_LS_TIMESTAMPS
			case 'e': list_fmt |= LIST_FULLTIME; break;
			case 'c':
				time_fmt = TIME_CHANGE;
#ifdef BB_FEATURE_LS_SORTFILES
				sort_opts= SORT_CTIME;
#endif
				break;
			case 'u':
				time_fmt = TIME_ACCESS;
#ifdef BB_FEATURE_LS_SORTFILES
				sort_opts= SORT_ATIME;
#endif
				break;
			case 't':
#ifdef BB_FEATURE_LS_SORTFILES
				sort_opts= SORT_MTIME;
#endif
				break;
#endif
#ifdef BB_FEATURE_LS_FOLLOWLINKS
			case 'L': follow_links= TRUE; break;
#endif
#ifdef BB_FEATURE_AUTOWIDTH
			case 'T': tabstops= atoi(optarg); break;
			case 'w': terminal_width= atoi(optarg); break;
#endif
#ifdef BB_FEATURE_HUMAN_READABLE
			case 'h': ls_disp_hr = 0; break;
			case 'k': ls_disp_hr = KILOBYTE; break;
#else
			case 'k': break;
#endif
			default:
				goto print_usage_message;
		}
	}

	/* sort out which command line options take precedence */
#ifdef BB_FEATURE_LS_RECURSIVE
	if (disp_opts & DISP_NOLIST)
		disp_opts &= ~DISP_RECURSIVE;   /* no recurse if listing only dir */
#endif
#if defined (BB_FEATURE_LS_TIMESTAMPS) && defined (BB_FEATURE_LS_SORTFILES)
	if (time_fmt & TIME_CHANGE) sort_opts= SORT_CTIME;
	if (time_fmt & TIME_ACCESS) sort_opts= SORT_ATIME;
#endif
	if (style_fmt != STYLE_LONG)
			list_fmt &= ~LIST_ID_NUMERIC;  /* numeric uid only for long list */
#ifdef BB_FEATURE_LS_USERNAME
	if (style_fmt == STYLE_LONG && (list_fmt & LIST_ID_NUMERIC))
			list_fmt &= ~LIST_ID_NAME;  /* don't list names if numeric uid */
#endif

	/* choose a display format */
	if (style_fmt == STYLE_AUTO)
		style_fmt = isatty(fileno(stdout)) ? STYLE_COLUMNS : STYLE_SINGLE;

	/*
	 * when there are no cmd line args we have to supply a default "." arg.
	 * we will create a second argv array, "av" that will hold either
	 * our created "." arg, or the real cmd line args.  The av array
	 * just holds the pointers- we don't move the date the pointers
	 * point to.
	 */
	ac= argc - optind;   /* how many cmd line args are left */
	if (ac < 1) {
		av= (char **)xcalloc((size_t)1, (size_t)(sizeof(char *)));
		av[0]= xstrdup(".");
		ac=1;
	} else {
		av= (char **)xcalloc((size_t)ac, (size_t)(sizeof(char *)));
		for (oi=0 ; oi < ac; oi++) {
			av[oi]= argv[optind++];  /* copy pointer to real cmd line arg */
		}
	}

	/* now, everything is in the av array */
	if (ac > 1)
		disp_opts |= DISP_DIRNAME;   /* 2 or more items? label directories */

	/* stuff the command line file names into an dnode array */
	dn=NULL;
	for (oi=0 ; oi < ac; oi++) {
		cur= (struct dnode *)xmalloc(sizeof(struct dnode));
		cur->fullname= xstrdup(av[oi]);
		cur->name= cur->fullname;
		if (my_stat(cur))
			continue;
		cur->next= dn;
		dn= cur;
		nfiles++;
	}

	/* now that we know how many files there are
	** allocate memory for an array to hold dnode pointers
	*/
	dnp= dnalloc(nfiles);
	for (i=0, cur=dn; i<nfiles; i++) {
		dnp[i]= cur;   /* save pointer to node in array */
		cur= cur->next;
	}


	if (disp_opts & DISP_NOLIST) {
#ifdef BB_FEATURE_LS_SORTFILES
		shellsort(dnp, nfiles);
#endif
		if (nfiles > 0) showfiles(dnp, nfiles);
	} else {
		dnd= splitdnarray(dnp, nfiles, SPLIT_DIR);
		dnf= splitdnarray(dnp, nfiles, SPLIT_FILE);
		dndirs= countdirs(dnp, nfiles);
		dnfiles= nfiles - dndirs;
		if (dnfiles > 0) {
#ifdef BB_FEATURE_LS_SORTFILES
			shellsort(dnf, dnfiles);
#endif
			showfiles(dnf, dnfiles);
		}
		if (dndirs > 0) {
#ifdef BB_FEATURE_LS_SORTFILES
			shellsort(dnd, dndirs);
#endif
			showdirs(dnd, dndirs);
		}
	}

	return(status);

  print_usage_message:
	usage(ls_usage);
}