1 /* ls.c - list files
2 *
3 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
4 * Copyright 2012 Rob Landley <rob@landley.net>
5 *
6 * See http://opengroup.org/onlinepubs/9699919799/utilities/ls.html
7
8 USE_LS(NEWTOY(ls, USE_LS_COLOR("(color):;")USE_LS_Z("Z")"goACFHLRSacdfiklmnpqrstux1[-Cxm1][-Cxml][-Cxmo][-Cxmg][-cu][-ftS][-HL]", TOYFLAG_BIN|TOYFLAG_LOCALE))
9
10 config LS
11 bool "ls"
12 default y
13 help
14 usage: ls [-ACFHLRSacdfiklmnpqrstux1] [directory...]
15 list files
16
17 what to show:
18 -a all files including .hidden -c use ctime for timestamps
19 -d directory, not contents -i inode number
20 -k block sizes in kilobytes -p put a '/' after dir names
21 -q unprintable chars as '?' -s size (in blocks)
22 -u use access time for timestamps -A list all files but . and ..
23 -H follow command line symlinks -L follow symlinks
24 -R recursively list files in subdirs -F append /dir *exe @sym |FIFO
25
26 output formats:
27 -1 list one file per line -C columns (sorted vertically)
28 -g like -l but no owner -l long (show full details)
29 -m comma separated -n like -l but numeric uid/gid
30 -o like -l but no group -x columns (horizontal sort)
31
32 sorting (default is alphabetical):
33 -f unsorted -r reverse -t timestamp -S size
34
35 config LS_Z
36 bool
37 default y
38 depends on LS && (TOYBOX_SELINUX || TOYBOX_SMACK)
39 help
40 usage: ls [-Z]
41
42 -Z security context
43
44 config LS_COLOR
45 bool "ls --color"
46 default y
47 depends on LS
48 help
49 usage: ls --color[=auto]
50
51 --color device=yellow symlink=turquoise/red dir=blue socket=purple
52 files: exe=green suid=red suidfile=redback stickydir=greenback
53 =auto means detect if output is a tty.
54 */
55
56 #define FOR_ls
57 #include "toys.h"
58
59 // test sst output (suid/sticky in ls flaglist)
60
61 // ls -lR starts .: then ./subdir:
62
GLOBALS(char * color;struct dirtree * files;unsigned screen_width;int nl_title;char uid_buf[12],gid_buf[12];)63 GLOBALS(
64 char *color;
65
66 struct dirtree *files;
67
68 unsigned screen_width;
69 int nl_title;
70 char uid_buf[12], gid_buf[12];
71 )
72
73 // Does two things: 1) Returns wcwidth(utf8) version of strlen,
74 // 2) replaces unprintable characters input string with '?' wildcard char.
75 int strwidth(char *s)
76 {
77 int total = 0, width, len;
78 wchar_t c;
79
80 if (!CFG_TOYBOX_I18N) {
81 total = strlen(s);
82 if (toys.optflags & FLAG_q) for (; *s; s++) if (!isprint(*s)) *s = '?';
83 } else while (*s) {
84 len = mbrtowc(&c, s, MB_CUR_MAX, 0);
85 if (len < 1 || (width = wcwidth(c)) < 0) {
86 total++;
87 if (toys.optflags & FLAG_q) *s = '?';
88 s++;
89 } else {
90 s += len;
91 total += width;
92 }
93 }
94
95 return total;
96 }
97
endtype(struct stat * st)98 static char endtype(struct stat *st)
99 {
100 mode_t mode = st->st_mode;
101 if ((toys.optflags&(FLAG_F|FLAG_p)) && S_ISDIR(mode)) return '/';
102 if (toys.optflags & FLAG_F) {
103 if (S_ISLNK(mode)) return '@';
104 if (S_ISREG(mode) && (mode&0111)) return '*';
105 if (S_ISFIFO(mode)) return '|';
106 if (S_ISSOCK(mode)) return '=';
107 }
108 return 0;
109 }
110
getusername(uid_t uid)111 static char *getusername(uid_t uid)
112 {
113 struct passwd *pw = getpwuid(uid);
114
115 sprintf(TT.uid_buf, "%u", (unsigned)uid);
116 return pw ? pw->pw_name : TT.uid_buf;
117 }
118
getgroupname(gid_t gid)119 static char *getgroupname(gid_t gid)
120 {
121 struct group *gr = getgrgid(gid);
122
123 sprintf(TT.gid_buf, "%u", (unsigned)gid);
124 return gr ? gr->gr_name : TT.gid_buf;
125 }
126
numlen(long long ll)127 static int numlen(long long ll)
128 {
129 return snprintf(0, 0, "%llu", ll);
130 }
131
132 // measure/print SELinux/smack security label. (If pad=0, just measure.)
seclabel(struct dirtree * dt,int pad)133 static unsigned seclabel(struct dirtree *dt, int pad)
134 {
135 if (CFG_TOYBOX_SELINUX) {
136 char* path = dirtree_path(dt, 0);
137 char* label = 0;
138 size_t len;
139
140 lgetfilecon(path, &label);
141 if (!label) {
142 label = strdup("?");
143 }
144
145 len = strlen(label);
146 if (pad) printf(" %*s "+(pad>0), pad, label);
147
148 free(label);
149 free(path);
150 return len;
151 } else if (CFG_TOYBOX_SMACK) {
152 int fd = openat(dirtree_parentfd(dt), dt->name, O_PATH|O_NOFOLLOW);
153 char buf[SMACK_LABEL_LEN+1];
154 ssize_t len = 1;
155
156 strcpy(buf, "?");
157 if (fd != -1) {
158 len = fgetxattr(fd, XATTR_NAME_SMACK, pad?buf:0, pad?SMACK_LABEL_LEN:0);
159 close(fd);
160
161 if (len<1 || len>SMACK_LABEL_LEN) len = 0;
162 else buf[len] = 0;
163 }
164 if (pad) printf(" %*s "+(pad>0), pad, buf);
165
166 return len;
167 }
168 }
169
170 // Figure out size of printable entry fields for display indent/wrap
171
entrylen(struct dirtree * dt,unsigned * len)172 static void entrylen(struct dirtree *dt, unsigned *len)
173 {
174 struct stat *st = &(dt->st);
175 unsigned flags = toys.optflags;
176
177 *len = strwidth(dt->name);
178 if (endtype(st)) ++*len;
179 if (flags & FLAG_m) ++*len;
180
181 len[1] = (flags & FLAG_i) ? numlen(st->st_ino) : 0;
182 if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
183 unsigned fn = flags & FLAG_n;
184 len[2] = numlen(st->st_nlink);
185 len[3] = fn ? numlen(st->st_uid) : strwidth(getusername(st->st_uid));
186 len[4] = fn ? numlen(st->st_gid) : strwidth(getgroupname(st->st_gid));
187 if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
188 // cheating slightly here: assuming minor is always 3 digits to avoid
189 // tracking another column
190 len[5] = numlen(major(st->st_rdev))+5;
191 } else len[5] = numlen(st->st_size);
192 }
193
194 len[6] = (flags & FLAG_s) ? numlen(st->st_blocks) : 0;
195 len[7] = (CFG_LS_Z && (flags & FLAG_Z)) ? seclabel(dt, 0) : 0;
196 }
197
compare(void * a,void * b)198 static int compare(void *a, void *b)
199 {
200 struct dirtree *dta = *(struct dirtree **)a;
201 struct dirtree *dtb = *(struct dirtree **)b;
202 int ret = 0, reverse = (toys.optflags & FLAG_r) ? -1 : 1;
203
204 if (toys.optflags & FLAG_S) {
205 if (dta->st.st_size > dtb->st.st_size) ret = -1;
206 else if (dta->st.st_size < dtb->st.st_size) ret = 1;
207 }
208 if (toys.optflags & FLAG_t) {
209 if (dta->st.st_mtime > dtb->st.st_mtime) ret = -1;
210 else if (dta->st.st_mtime < dtb->st.st_mtime) ret = 1;
211 }
212 if (!ret) ret = strcmp(dta->name, dtb->name);
213 return ret * reverse;
214 }
215
216 // callback from dirtree_recurse() determining how to handle this entry.
217
filter(struct dirtree * new)218 static int filter(struct dirtree *new)
219 {
220 int flags = toys.optflags;
221
222 // Special case to handle enormous dirs without running out of memory.
223 if (flags == (FLAG_1|FLAG_f)) {
224 xprintf("%s\n", new->name);
225 return 0;
226 }
227
228 if (flags & FLAG_u) new->st.st_mtime = new->st.st_atime;
229 if (flags & FLAG_c) new->st.st_mtime = new->st.st_ctime;
230 if (flags & FLAG_k) new->st.st_blocks = (new->st.st_blocks + 1) / 2;
231
232 if (flags & (FLAG_a|FLAG_f)) return DIRTREE_SAVE;
233 if (!(flags & FLAG_A) && new->name[0]=='.') return 0;
234
235 return dirtree_notdotdot(new) & DIRTREE_SAVE;
236 }
237
238 // For column view, calculate horizontal position (for padding) and return
239 // index of next entry to display.
240
next_column(unsigned long ul,unsigned long dtlen,unsigned columns,unsigned * xpos)241 static unsigned long next_column(unsigned long ul, unsigned long dtlen,
242 unsigned columns, unsigned *xpos)
243 {
244 unsigned long transition;
245 unsigned height, widecols;
246
247 // Horizontal sort is easy
248 if (!(toys.optflags & FLAG_C)) {
249 *xpos = ul % columns;
250 return ul;
251 }
252
253 // vertical sort
254
255 // For -x, calculate height of display, rounded up
256 height = (dtlen+columns-1)/columns;
257
258 // Sanity check: does wrapping render this column count impossible
259 // due to the right edge wrapping eating a whole row?
260 if (height*columns - dtlen >= height) {
261 *xpos = columns;
262 return 0;
263 }
264
265 // Uneven rounding goes along right edge
266 widecols = dtlen % height;
267 if (!widecols) widecols = height;
268 transition = widecols * columns;
269 if (ul < transition) {
270 *xpos = ul % columns;
271 return (*xpos*height) + (ul/columns);
272 }
273
274 ul -= transition;
275 *xpos = ul % (columns-1);
276
277 return (*xpos*height) + widecols + (ul/(columns-1));
278 }
279
color_from_mode(mode_t mode)280 int color_from_mode(mode_t mode)
281 {
282 int color = 0;
283
284 if (S_ISDIR(mode)) color = 256+34;
285 else if (S_ISLNK(mode)) color = 256+36;
286 else if (S_ISBLK(mode) || S_ISCHR(mode)) color = 256+33;
287 else if (S_ISREG(mode) && (mode&0111)) color = 256+32;
288 else if (S_ISFIFO(mode)) color = 33;
289 else if (S_ISSOCK(mode)) color = 256+35;
290
291 return color;
292 }
293
294 // Display a list of dirtree entries, according to current format
295 // Output types -1, -l, -C, or stream
296
listfiles(int dirfd,struct dirtree * indir)297 static void listfiles(int dirfd, struct dirtree *indir)
298 {
299 struct dirtree *dt, **sort;
300 unsigned long dtlen, ul = 0;
301 unsigned width, flags = toys.optflags, totals[8], len[8], totpad = 0,
302 *colsizes = (unsigned *)(toybuf+260), columns = (sizeof(toybuf)-260)/4;
303
304 memset(totals, 0, sizeof(totals));
305
306 // Silently descend into single directory listed by itself on command line.
307 // In this case only show dirname/total header when given -R.
308 if (!indir->parent) {
309 if (!(dt = indir->child)) return;
310 if (S_ISDIR(dt->st.st_mode) && !dt->next && !(flags & FLAG_d)) {
311 dt->extra = 1;
312 listfiles(open(dt->name, 0), dt);
313
314 return;
315 }
316 } else {
317 // Read directory contents. We dup() the fd because this will close it.
318 indir->data = dup(dirfd);
319 dirtree_recurse(indir, filter, DIRTREE_SYMFOLLOW*!!(flags&FLAG_L));
320 }
321
322 // Copy linked list to array and sort it. Directories go in array because
323 // we visit them in sorted order too. (The nested loops let us measure and
324 // fill with the same inner loop.)
325 for (sort = 0;;sort = xmalloc(dtlen*sizeof(void *))) {
326 for (dtlen = 0, dt = indir->child; dt; dt = dt->next, dtlen++)
327 if (sort) sort[dtlen] = dt;
328 if (sort) break;
329 }
330
331 // Label directory if not top of tree, or if -R
332 if (indir->parent && (!indir->extra || (flags & FLAG_R)))
333 {
334 char *path = dirtree_path(indir, 0);
335
336 if (TT.nl_title++) xputc('\n');
337 xprintf("%s:\n", path);
338 free(path);
339 }
340
341 // Measure each entry to work out whitespace padding and total blocks
342 if (!(flags & FLAG_f)) {
343 unsigned long long blocks = 0;
344
345 qsort(sort, dtlen, sizeof(void *), (void *)compare);
346 for (ul = 0; ul<dtlen; ul++) {
347 entrylen(sort[ul], len);
348 for (width = 0; width<8; width++)
349 if (len[width]>totals[width]) totals[width] = len[width];
350 blocks += sort[ul]->st.st_blocks;
351 }
352 totpad = totals[1]+!!totals[1]+totals[6]+!!totals[6]+totals[7]+!!totals[7];
353 if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g|FLAG_s) && indir->parent)
354 xprintf("total %llu\n", blocks);
355 }
356
357 // Find largest entry in each field for display alignment
358 if (flags & (FLAG_C|FLAG_x)) {
359
360 // columns can't be more than toybuf can hold, or more than files,
361 // or > 1/2 screen width (one char filename, one space).
362 if (columns > TT.screen_width/2) columns = TT.screen_width/2;
363 if (columns > dtlen) columns = dtlen;
364
365 // Try to fit as many columns as we can, dropping down by one each time
366 for (;columns > 1; columns--) {
367 unsigned c, totlen = columns;
368
369 memset(colsizes, 0, columns*sizeof(unsigned));
370 for (ul=0; ul<dtlen; ul++) {
371 entrylen(sort[next_column(ul, dtlen, columns, &c)], len);
372 *len += totpad;
373 if (c == columns) break;
374 // Expand this column if necessary, break if that puts us over budget
375 if (*len > colsizes[c]) {
376 totlen += (*len)-colsizes[c];
377 colsizes[c] = *len;
378 if (totlen > TT.screen_width) break;
379 }
380 }
381 // If everything fit, stop here
382 if (ul == dtlen) break;
383 }
384 }
385
386 // Loop through again to produce output.
387 memset(toybuf, ' ', 256);
388 width = 0;
389 for (ul = 0; ul<dtlen; ul++) {
390 unsigned curcol, color = 0;
391 unsigned long next = next_column(ul, dtlen, columns, &curcol);
392 struct stat *st = &(sort[next]->st);
393 mode_t mode = st->st_mode;
394 char et = endtype(st);
395
396 // Skip directories at the top of the tree when -d isn't set
397 if (S_ISDIR(mode) && !indir->parent && !(flags & FLAG_d)) continue;
398 TT.nl_title=1;
399
400 // Handle padding and wrapping for display purposes
401 entrylen(sort[next], len);
402 if (ul) {
403 if (flags & FLAG_m) xputc(',');
404 if (flags & (FLAG_C|FLAG_x)) {
405 if (!curcol) xputc('\n');
406 } else if ((flags & FLAG_1) || width+1+*len > TT.screen_width) {
407 xputc('\n');
408 width = 0;
409 } else {
410 xputc(' ');
411 width++;
412 }
413 }
414 width += *len;
415
416 if (flags & FLAG_i)
417 xprintf("%*lu ", totals[1], (unsigned long)st->st_ino);
418 if (flags & FLAG_s)
419 xprintf("%*lu ", totals[6], (unsigned long)st->st_blocks);
420
421 if (flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) {
422 struct tm *tm;
423 char perm[11], thyme[64], *usr, *upad, *grp, *grpad;
424
425 mode_to_string(mode, perm);
426
427 if (flags&FLAG_o) grp = grpad = toybuf+256;
428 else {
429 if (flags&FLAG_n) sprintf(grp = thyme, "%u", (unsigned)st->st_gid);
430 else strwidth(grp = getgroupname(st->st_gid));
431 grpad = toybuf+256-(totals[4]-len[4]);
432 }
433
434 if (flags&FLAG_g) usr = upad = toybuf+256;
435 else {
436 upad = toybuf+255-(totals[3]-len[3]);
437 if (flags&FLAG_n) sprintf(usr = TT.uid_buf, "%u", (unsigned)st->st_uid);
438 else strwidth(usr = getusername(st->st_uid));
439 }
440
441 // Coerce the st types into something we know we can print.
442 printf("%s% *ld %s%s%s%s", perm, totals[2]+1, (long)st->st_nlink,
443 usr, upad, grp, grpad);
444
445 if (CFG_LS_Z && (flags & FLAG_Z)) seclabel(sort[next], -(int)totals[7]);
446
447 if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
448 printf("% *d,% 4d", totals[5]-4, major(st->st_rdev),minor(st->st_rdev));
449 else printf("% *lld", totals[5]+1, (long long)st->st_size);
450
451 tm = localtime(&(st->st_mtime));
452 strftime(thyme, sizeof(thyme), "%F %H:%M", tm);
453 xprintf(" %s ", thyme);
454 } else if (CFG_LS_Z && (flags & FLAG_Z)) seclabel(sort[next], totals[7]);
455
456 if (flags & FLAG_color) {
457 color = color_from_mode(st->st_mode);
458 if (color) printf("\033[%d;%dm", color>>8, color&255);
459 }
460
461 if (flags & FLAG_q) {
462 char *p;
463 for (p=sort[next]->name; *p; p++) fputc(isprint(*p) ? *p : '?', stdout);
464 } else xprintf("%s", sort[next]->name);
465 if (color) xprintf("\033[0m");
466
467 if ((flags & (FLAG_l|FLAG_o|FLAG_n|FLAG_g)) && S_ISLNK(mode)) {
468 printf(" -> ");
469 if (flags & FLAG_color) {
470 struct stat st2;
471
472 if (fstatat(dirfd, sort[next]->symlink, &st2, 0)) color = 256+31;
473 else color = color_from_mode(st2.st_mode);
474
475 if (color) printf("\033[%d;%dm", color>>8, color&255);
476 }
477
478 printf("%s", sort[next]->symlink);
479 if (color) printf("\033[0m");
480 }
481
482 if (et) xputc(et);
483
484 // Pad columns
485 if (flags & (FLAG_C|FLAG_x)) {
486 curcol = colsizes[curcol]-(*len)-totpad;
487 if (curcol < 255) xprintf("%s", toybuf+255-curcol);
488 }
489 }
490
491 if (width) xputc('\n');
492
493 // Free directory entries, recursing first if necessary.
494
495 for (ul = 0; ul<dtlen; free(sort[ul++])) {
496 if ((flags & FLAG_d) || !S_ISDIR(sort[ul]->st.st_mode)
497 || !dirtree_notdotdot(sort[ul])) continue;
498
499 // Recurse into dirs if at top of the tree or given -R
500 if (!indir->parent || (flags & FLAG_R))
501 listfiles(openat(dirfd, sort[ul]->name, 0), sort[ul]);
502 }
503 free(sort);
504 if (dirfd != AT_FDCWD) close(dirfd);
505 }
506
ls_main(void)507 void ls_main(void)
508 {
509 char **s, *noargs[] = {".", 0};
510 struct dirtree *dt;
511
512 TT.screen_width = 80;
513 terminal_size(&TT.screen_width, NULL);
514 if (TT.screen_width<2) TT.screen_width = 2;
515
516 // Do we have an implied -1
517 if (!isatty(1)) {
518 toys.optflags |= FLAG_1;
519 if (TT.color) toys.optflags ^= FLAG_color;
520 } else if (toys.optflags&(FLAG_l|FLAG_o|FLAG_n|FLAG_g))
521 toys.optflags |= FLAG_1;
522 else if (!(toys.optflags&(FLAG_1|FLAG_x|FLAG_m))) toys.optflags |= FLAG_C;
523 // The optflags parsing infrastructure should really do this for us,
524 // but currently it has "switch off when this is set", so "-dR" and "-Rd"
525 // behave differently
526 if (toys.optflags & FLAG_d) toys.optflags &= ~FLAG_R;
527
528 // Iterate through command line arguments, collecting directories and files.
529 // Non-absolute paths are relative to current directory.
530 TT.files = dirtree_start(0, 0);
531 for (s = *toys.optargs ? toys.optargs : noargs; *s; s++) {
532 dt = dirtree_start(*s, !(toys.optflags&(FLAG_l|FLAG_d|FLAG_F)) ||
533 (toys.optflags&(FLAG_L|FLAG_H)));
534
535 // note: double_list->prev temporarirly goes in dirtree->parent
536 if (dt) dlist_add_nomalloc((void *)&TT.files->child, (void *)dt);
537 else toys.exitval = 1;
538 }
539
540 // Convert double_list into dirtree.
541 dlist_terminate(TT.files->child);
542 for (dt = TT.files->child; dt; dt = dt->next) dt->parent = TT.files;
543
544 // Display the files we collected
545 listfiles(AT_FDCWD, TT.files);
546
547 if (CFG_TOYBOX_FREE) free(TT.files);
548 }
549