aboutsummaryrefslogtreecommitdiff
path: root/toys/posix/ls.c
blob: 35a7266a8ec2da66de2706b3b22c524cb5f7de9b (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
/* ls.c - list files
 *
 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
 * Copyright 2012 Rob Landley <rob@landley.net>
 *
 * See http://opengroup.org/onlinepubs/9699919799/utilities/ls.html

USE_LS(NEWTOY(ls, USE_LS_COLOR("(color):;")"(show-control-chars)ZgoACFHLRSabcdfhiklmnpqrstux1[-Cxm1][-Cxml][-Cxmo][-Cxmg][-cu][-ftS][-HL][!qb]", TOYFLAG_BIN|TOYFLAG_LOCALE))

config LS
  bool "ls"
  default y
  help
    usage: ls [-ACFHLRSZacdfhiklmnpqrstux1] [directory...]

    list files

    what to show:
    -a  all files including .hidden    -b  escape nongraphic chars
    -c  use ctime for timestamps       -d  directory, not contents
    -i  inode number                   -p  put a '/' after dir names
    -q  unprintable chars as '?'       -s  storage used (1024 byte units)
    -u  use access time for timestamps -A  list all files but . and ..
    -H  follow command line symlinks   -L  follow symlinks
    -R  recursively list in subdirs    -F  append /dir *exe @sym |FIFO
    -Z  security context

    output formats:
    -1  list one file per line         -C  columns (sorted vertically)
    -g  like -l but no owner           -h  human readable sizes
    -l  long (show full details)       -m  comma separated
    -n  like -l but numeric uid/gid    -o  like -l but no group
    -x  columns (horizontal sort)

    sorting (default is alphabetical):
    -f  unsorted    -r  reverse    -t  timestamp    -S  size

config LS_COLOR
  bool "ls --color"
  default y
  depends on LS
  help
    usage: ls --color[=auto]

    --color  device=yellow  symlink=turquoise/red  dir=blue  socket=purple
             files: exe=green  suid=red  suidfile=redback  stickydir=greenback
             =auto means detect if output is a tty.
*/

#define FOR_ls
#include "toys.h"

// test sst output (suid/sticky in ls flaglist)

// ls -lR starts .: then ./subdir:

GLOBALS(
  char *color;

  struct dirtree *files, *singledir;

  unsigned screen_width;
  int nl_title;
  char *escmore;
)

// Callback from crunch_str to represent unprintable chars
static int crunch_qb(FILE *out, int cols, int wc)
{
  unsigned len = 1;
  char buf[32];

  if (toys.optflags&FLAG_q) *buf = '?';
  else {
    if (wc<256) *buf = wc;
    // scrute the inscrutable, eff the ineffable, print the unprintable
    else len = wcrtomb(buf, wc, 0);
    if (toys.optflags&FLAG_b) {
      char *to = buf, *from = buf+24;
      int i, j;

      memcpy(from, to, 8);
      for (i = 0; i<len; i++) {
        *to++ = '\\';
        if (strchr(TT.escmore, from[i])) *to++ = from[i];
        else if (-1 != (j = stridx("\\\a\b\033\f\n\r\t\v", from[i])))
          *to++ = "\\abefnrtv"[j];
        else to += sprintf(to, "%03o", from[i]);
      }
      len = to-buf;
    }
  }

  if (cols<len) len = cols;
  if (out) fwrite(buf, len, 1, out);

  return len;
}

// Returns wcwidth(utf8) version of strlen with -qb escapes
static int strwidth(char *s)
{
  return crunch_str(&s, INT_MAX, 0, TT.escmore, crunch_qb);
}

static char endtype(struct stat *st)
{
  mode_t mode = st->st_mode;
  if ((toys.optflags&(FLAG_F|FLAG_p)) && S_ISDIR(mode)) return '/';
  if (toys.optflags & FLAG_F) {
    if (S_ISLNK(mode)) return '@';
    if (S_ISREG(mode) && (mode&0111)) return '*';
    if (S_ISFIFO(mode)) return '|';
    if (S_ISSOCK(mode)) return '=';
  }
  return 0;
}

static int numlen(long long ll)
{
  return snprintf(0, 0, "%llu", ll);
}

static int print_with_h(char *s, long long value, int units)
{
  if (toys.optflags&FLAG_h) return human_readable(s, value*units, 0);
  else return sprintf(s, "%lld", value);
}

// Figure out size of printable entry fields for display indent/wrap

static void entrylen(struct dirtree *dt, unsigned *len)
{
  struct stat *st = &(dt->st);
  unsigned flags = toys.optflags;
  char tmp[64];

  *len = strwidth(dt->name);
  if (endtype(st)) ++*len;
  if (flags & FLAG_m) ++*len;

  len[1] = (flags & FLAG_i) ? numlen(st->st_ino) : 0;
  if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
    unsigned fn = flags & FLAG_n;
    len[2] = numlen(st->st_nlink);
    len[3] = fn ? numlen(st->st_uid) : strwidth(getusername(st->st_uid));
    len[4] = fn ? numlen(st->st_gid) : strwidth(getgroupname(st->st_gid));
    if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
      // cheating slightly here: assuming minor is always 3 digits to avoid
      // tracking another column
      len[5] = numlen(dev_major(st->st_rdev))+5;
    } else len[5] = print_with_h(tmp, st->st_size, 1);
  }

  len[6] = (flags & FLAG_s) ? print_with_h(tmp, st->st_blocks, 512) : 0;
  len[7] = (flags & FLAG_Z) ? strwidth((char *)dt->extra) : 0;
}

static int compare(void *a, void *b)
{
  struct dirtree *dta = *(struct dirtree **)a;
  struct dirtree *dtb = *(struct dirtree **)b;
  int ret = 0, reverse = (toys.optflags & FLAG_r) ? -1 : 1;

  if (toys.optflags & FLAG_S) {
    if (dta->st.st_size > dtb->st.st_size) ret = -1;
    else if (dta->st.st_size < dtb->st.st_size) ret = 1;
  }
  if (toys.optflags & FLAG_t) {
    if (dta->st.st_mtime > dtb->st.st_mtime) ret = -1;
    else if (dta->st.st_mtime < dtb->st.st_mtime) ret = 1;
  }
  if (!ret) ret = strcmp(dta->name, dtb->name);
  return ret * reverse;
}

// callback from dirtree_recurse() determining how to handle this entry.

static int filter(struct dirtree *new)
{
  int flags = toys.optflags;

  // Special case to handle enormous dirs without running out of memory.
  if (flags == (FLAG_1|FLAG_f)) {
    xprintf("%s\n", new->name);
    return 0;
  }

  if (flags & FLAG_Z) {
    if (!CFG_TOYBOX_LSM_NONE) {

      // (Wouldn't it be nice if the lsm functions worked like openat(),
      // fchmodat(), mknodat(), readlinkat() so we could do this without
      // even O_PATH? But no, this is 1990's tech.)
      int fd = openat(dirtree_parentfd(new), new->name,
        O_PATH|(O_NOFOLLOW*!(toys.optflags&FLAG_L)));

      if (fd != -1) {
        if (-1 == lsm_fget_context(fd, (char **)&new->extra) && errno == EBADF)
        {
          char hack[32];

          // Work around kernel bug that won't let us read this "metadata" from
          // the filehandle unless we have permission to read the data. (We can
          // query the same data in by path, but can't do it through an O_PATH
          // filehandle, because reasons. But for some reason, THIS is ok? If
          // they ever fix the kernel, this should stop triggering.)

          sprintf(hack, "/proc/self/fd/%d", fd);
          lsm_lget_context(hack, (char **)&new->extra);
        }
        close(fd);
      }
    }
    if (CFG_TOYBOX_LSM_NONE || !new->extra) new->extra = (long)xstrdup("?");
  }

  if (flags & FLAG_u) new->st.st_mtime = new->st.st_atime;
  if (flags & FLAG_c) new->st.st_mtime = new->st.st_ctime;
  new->st.st_blocks >>= 1;

  if (flags & (FLAG_a|FLAG_f)) return DIRTREE_SAVE;
  if (!(flags & FLAG_A) && new->name[0]=='.') return 0;

  return dirtree_notdotdot(new) & DIRTREE_SAVE;
}

// For column view, calculate horizontal position (for padding) and return
// index of next entry to display.

static unsigned long next_column(unsigned long ul, unsigned long dtlen,
  unsigned columns, unsigned *xpos)
{
  unsigned long transition;
  unsigned height, widecols;

  // Horizontal sort is easy
  if (!(toys.optflags & FLAG_C)) {
    *xpos = ul % columns;
    return ul;
  }

  // vertical sort

  // For -x, calculate height of display, rounded up
  height = (dtlen+columns-1)/columns;

  // Sanity check: does wrapping render this column count impossible
  // due to the right edge wrapping eating a whole row?
  if (height*columns - dtlen >= height) {
    *xpos = columns;
    return 0;
  }

  // Uneven rounding goes along right edge
  widecols = dtlen % height;
  if (!widecols) widecols = height;
  transition = widecols * columns;
  if (ul < transition) {
    *xpos =  ul % columns;
    return (*xpos*height) + (ul/columns);
  }

  ul -= transition;
  *xpos = ul % (columns-1);

  return (*xpos*height) + widecols + (ul/(columns-1));
}

static int color_from_mode(mode_t mode)
{
  int color = 0;

  if (S_ISDIR(mode)) color = 256+34;
  else if (S_ISLNK(mode)) color = 256+36;
  else if (S_ISBLK(mode) || S_ISCHR(mode)) color = 256+33;
  else if (S_ISREG(mode) && (mode&0111)) color = 256+32;
  else if (S_ISFIFO(mode)) color = 33;
  else if (S_ISSOCK(mode)) color = 256+35;

  return color;
}

// Display a list of dirtree entries, according to current format
// Output types -1, -l, -C, or stream

static void listfiles(int dirfd, struct dirtree *indir)
{
  struct dirtree *dt, **sort;
  unsigned long dtlen, ul = 0;
  unsigned width, flags = toys.optflags, totals[8], len[8], totpad = 0,
    *colsizes = (unsigned *)(toybuf+260), columns = (sizeof(toybuf)-260)/4;
  char tmp[64];

  if (-1 == dirfd) {
    perror_msg_raw(indir->name);

    return;
  }

  memset(totals, 0, sizeof(totals));
  if (CFG_TOYBOX_DEBUG) memset(len, 0, sizeof(len));

  // Top level directory was already populated by main()
  if (!indir->parent) {
    // Silently descend into single directory listed by itself on command line.
    // In this case only show dirname/total header when given -R.
    dt = indir->child;
    if (dt && S_ISDIR(dt->st.st_mode) && !dt->next && !(flags&(FLAG_d|FLAG_R)))
    {
      listfiles(open(dt->name, 0), TT.singledir = dt);

      return;
    }

    // Do preprocessing (Dirtree didn't populate, so callback wasn't called.)
    for (;dt; dt = dt->next) filter(dt);
    if (flags == (FLAG_1|FLAG_f)) return;
  // Read directory contents. We dup() the fd because this will close it.
  // This reads/saves contents to display later, except for in "ls -1f" mode.
  } else dirtree_recurse(indir, filter, dup(dirfd),
      DIRTREE_SYMFOLLOW*!!(flags&FLAG_L));

  // Copy linked list to array and sort it. Directories go in array because
  // we visit them in sorted order too. (The nested loops let us measure and
  // fill with the same inner loop.)
  for (sort = 0;;sort = xmalloc(dtlen*sizeof(void *))) {
    for (dtlen = 0, dt = indir->child; dt; dt = dt->next, dtlen++)
      if (sort) sort[dtlen] = dt;
    if (sort || !dtlen) break;
  }

  // Label directory if not top of tree, or if -R
  if (indir->parent && (TT.singledir!=indir || (flags&FLAG_R)))
  {
    char *path = dirtree_path(indir, 0);

    if (TT.nl_title++) xputc('\n');
    xprintf("%s:\n", path);
    free(path);
  }

  // Measure each entry to work out whitespace padding and total blocks
  if (!(flags & FLAG_f)) {
    unsigned long long blocks = 0;

    qsort(sort, dtlen, sizeof(void *), (void *)compare);
    for (ul = 0; ul<dtlen; ul++) {
      entrylen(sort[ul], len);
      for (width = 0; width<8; width++)
        if (len[width]>totals[width]) totals[width] = len[width];
      blocks += sort[ul]->st.st_blocks;
    }
    totpad = totals[1]+!!totals[1]+totals[6]+!!totals[6]+totals[7]+!!totals[7];
    if ((flags&(FLAG_h|FLAG_l|FLAG_o|FLAG_n|FLAG_g|FLAG_s)) && indir->parent) {
      print_with_h(tmp, blocks, 512);
      xprintf("total %s\n", tmp);
    }
  }

  // Find largest entry in each field for display alignment
  if (flags & (FLAG_C|FLAG_x)) {

    // columns can't be more than toybuf can hold, or more than files,
    // or > 1/2 screen width (one char filename, one space).
    if (columns > TT.screen_width/2) columns = TT.screen_width/2;
    if (columns > dtlen) columns = dtlen;

    // Try to fit as many columns as we can, dropping down by one each time
    for (;columns > 1; columns--) {
      unsigned c, totlen = columns;

      memset(colsizes, 0, columns*sizeof(unsigned));
      for (ul=0; ul<dtlen; ul++) {
        entrylen(sort[next_column(ul, dtlen, columns, &c)], len);
        *len += totpad+1;
        if (c == columns) break;
        // Expand this column if necessary, break if that puts us over budget
        if (*len > colsizes[c]) {
          totlen += (*len)-colsizes[c];
          colsizes[c] = *len;
          if (totlen > TT.screen_width) break;
        }
      }
      // If everything fit, stop here
      if (ul == dtlen) break;
    }
  }

  // Loop through again to produce output.
  width = 0;
  for (ul = 0; ul<dtlen; ul++) {
    int ii;
    unsigned curcol, color = 0;
    unsigned long next = next_column(ul, dtlen, columns, &curcol);
    struct stat *st = &(sort[next]->st);
    mode_t mode = st->st_mode;
    char et = endtype(st), *ss;

    // Skip directories at the top of the tree when -d isn't set
    if (S_ISDIR(mode) && !indir->parent && !(flags & FLAG_d)) continue;
    TT.nl_title=1;

    // Handle padding and wrapping for display purposes
    entrylen(sort[next], len);
    if (ul) {
      int mm = !!(flags & FLAG_m);

      if (mm) xputc(',');
      if (flags & (FLAG_C|FLAG_x)) {
        if (!curcol) xputc('\n');
      } else if ((flags & FLAG_1) || width+1+*len > TT.screen_width) {
        xputc('\n');
        width = 0;
      } else {
        printf("  "+mm, 0); // shut up the stupid compiler
        width += 2-mm;
      }
    }
    width += *len;

    if (flags & FLAG_i) printf("%*lu ", totals[1], (unsigned long)st->st_ino);

    if (flags & FLAG_s) {
      print_with_h(tmp, st->st_blocks, 512);
      printf("%*s ", totals[6], tmp);
    }

    if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
      struct tm *tm;

      // (long) is to coerce the st types into something we know we can print.
      mode_to_string(mode, tmp);
      printf("%s% *ld", tmp, totals[2]+1, (long)st->st_nlink);

      // print user
      if (!(flags&FLAG_g)) {
        putchar(' ');
        ii = -totals[3];
        if (flags&FLAG_n) printf("%*u", ii, (unsigned)st->st_uid);
        else draw_trim_esc(getusername(st->st_uid), ii, abs(ii), TT.escmore,
                           crunch_qb);
      }

      // print group
      if (!(flags&FLAG_o)) {
        putchar(' ');
        ii = -totals[4];
        if (flags&FLAG_n) printf("%*u", ii, (unsigned)st->st_gid);
        else draw_trim_esc(getgroupname(st->st_gid), ii, abs(ii), TT.escmore,
                           crunch_qb);
      }

      if (flags & FLAG_Z)
        printf(" %-*s", -(int)totals[7], (char *)sort[next]->extra);

      // print major/minor, or size
      if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
        printf("% *d,% 4d", totals[5]-4, dev_major(st->st_rdev),
          dev_minor(st->st_rdev));
      else {
        print_with_h(tmp, st->st_size, 1);
        printf("%*s", totals[5]+1, tmp);
      }

      // print time, always in --time-style=long-iso
      tm = localtime(&(st->st_mtime));
      strftime(tmp, sizeof(tmp), "%F %H:%M", tm);
      printf(" %s ", tmp);
    } else if (flags & FLAG_Z)
      printf("%-*s ", (int)totals[7], (char *)sort[next]->extra);

    if (flags & FLAG_color) {
      color = color_from_mode(st->st_mode);
      if (color) printf("\033[%d;%dm", color>>8, color&255);
    }

    ss = sort[next]->name;
    crunch_str(&ss, INT_MAX, stdout, TT.escmore, crunch_qb);
    if (color) printf("\033[0m");

    if ((flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) && S_ISLNK(mode)) {
      printf(" -> ");
      if (flags & FLAG_color) {
        struct stat st2;

        if (fstatat(dirfd, sort[next]->symlink, &st2, 0)) color = 256+31;
        else color = color_from_mode(st2.st_mode);

        if (color) printf("\033[%d;%dm", color>>8, color&255);
      }

      printf("%s", sort[next]->symlink);
      if (color) printf("\033[0m");
    }

    if (et) xputc(et);

    // Pad columns
    if (flags & (FLAG_C|FLAG_x)) {
      curcol = colsizes[curcol]-(*len)-totpad;
      if (curcol < 255) printf("%*c", curcol, ' ');
    }
  }

  if (width) xputc('\n');

  // Free directory entries, recursing first if necessary.

  for (ul = 0; ul<dtlen; free(sort[ul++])) {
    if ((flags & FLAG_d) || !S_ISDIR(sort[ul]->st.st_mode)) continue;

    // Recurse into dirs if at top of the tree or given -R
    if (!indir->parent || ((flags&FLAG_R) && dirtree_notdotdot(sort[ul])))
      listfiles(openat(dirfd, sort[ul]->name, 0), sort[ul]);
    free((void *)sort[ul]->extra);
  }
  free(sort);
  if (dirfd != AT_FDCWD) close(dirfd);
}

void ls_main(void)
{
  char **s, *noargs[] = {".", 0};
  struct dirtree *dt;

  // Do we have an implied -1
  if (isatty(1)) {
    if (!(toys.optflags&FLAG_show_control_chars)) toys.optflags |= FLAG_b;
    if (toys.optflags&(FLAG_l|FLAG_o|FLAG_n|FLAG_g)) toys.optflags |= FLAG_1;
    else if (!(toys.optflags&(FLAG_1|FLAG_x|FLAG_m))) toys.optflags |= FLAG_C;
  } else {
    if (!(toys.optflags & FLAG_m)) toys.optflags |= FLAG_1;
    if (TT.color) toys.optflags ^= FLAG_color;
  }

  TT.screen_width = 80;
  terminal_size(&TT.screen_width, NULL);
  if (TT.screen_width<2) TT.screen_width = 2;
  if (toys.optflags&FLAG_b) TT.escmore = " \\";

  // The optflags parsing infrastructure should really do this for us,
  // but currently it has "switch off when this is set", so "-dR" and "-Rd"
  // behave differently
  if (toys.optflags & FLAG_d) toys.optflags &= ~FLAG_R;

  // Iterate through command line arguments, collecting directories and files.
  // Non-absolute paths are relative to current directory. Top of tree is
  // a dummy node to collect command line arguments into pseudo-directory.
  TT.files = dirtree_add_node(0, 0, 0);
  TT.files->dirfd = AT_FDCWD;
  for (s = *toys.optargs ? toys.optargs : noargs; *s; s++) {
    int sym = !(toys.optflags&(FLAG_l|FLAG_d|FLAG_F))
      || (toys.optflags&(FLAG_L|FLAG_H));

    dt = dirtree_add_node(0, *s, DIRTREE_SYMFOLLOW*sym);

    // note: double_list->prev temporarirly goes in dirtree->parent
    if (dt) dlist_add_nomalloc((void *)&TT.files->child, (void *)dt);
    else toys.exitval = 1;
  }

  // Convert double_list into dirtree.
  dlist_terminate(TT.files->child);
  for (dt = TT.files->child; dt; dt = dt->next) dt->parent = TT.files;

  // Display the files we collected
  listfiles(AT_FDCWD, TT.files);

  if (CFG_TOYBOX_FREE) free(TT.files);
}