1 /* $OpenBSD: ls.c,v 1.39 2014/03/31 20:54:37 sobrado Exp $ */ 2 /* $NetBSD: ls.c,v 1.18 1996/07/09 09:16:29 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Michael Fischbein. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <sys/ioctl.h> 39 40 #include <dirent.h> 41 #include <err.h> 42 #include <errno.h> 43 #include <fts.h> 44 #include <grp.h> 45 #include <pwd.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 #include <util.h> 51 52 #include "ls.h" 53 #include "extern.h" 54 55 static void display(FTSENT *, FTSENT *); 56 static int mastercmp(const FTSENT **, const FTSENT **); 57 static void traverse(int, char **, int); 58 59 static void (*printfcn)(DISPLAY *); 60 static int (*sortfcn)(const FTSENT *, const FTSENT *); 61 62 #define BY_NAME 0 63 #define BY_SIZE 1 64 #define BY_TIME 2 65 66 long blocksize; /* block size units */ 67 int termwidth = 80; /* default terminal width */ 68 int sortkey = BY_NAME; 69 70 /* flags */ 71 int f_accesstime; /* use time of last access */ 72 int f_column; /* columnated format */ 73 int f_columnacross; /* columnated format, sorted across */ 74 int f_flags; /* show flags associated with a file */ 75 int f_grouponly; /* long listing format without owner */ 76 int f_humanval; /* show human-readable file sizes */ 77 int f_inode; /* print inode */ 78 int f_listdir; /* list actual directory, not contents */ 79 int f_listdot; /* list files beginning with . */ 80 int f_longform; /* long listing format */ 81 int f_nonprint; /* show unprintables as ? */ 82 int f_nosort; /* don't sort output */ 83 int f_numericonly; /* don't expand uid to symbolic name */ 84 int f_recursive; /* ls subdirectories also */ 85 int f_reversesort; /* reverse whatever sort is used */ 86 int f_sectime; /* print the real time for all files */ 87 int f_singlecol; /* use single column output */ 88 int f_size; /* list size in short listing */ 89 int f_statustime; /* use time of last mode change */ 90 int f_stream; /* stream format */ 91 int f_type; /* add type character for non-regular files */ 92 int f_typedir; /* add type character for directories */ 93 94 int rval; 95 96 int 97 ls_main(int argc, char *argv[]) 98 { 99 static char dot[] = ".", *dotav[] = { dot, NULL }; 100 struct winsize win; 101 int ch, fts_options, notused; 102 int kflag = 0; 103 char *p; 104 105 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 106 if (isatty(STDOUT_FILENO)) { 107 if ((p = getenv("COLUMNS")) != NULL) 108 termwidth = atoi(p); 109 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 110 win.ws_col > 0) 111 termwidth = win.ws_col; 112 f_column = f_nonprint = 1; 113 } else { 114 f_singlecol = 1; 115 /* retrieve environment variable, in case of explicit -C */ 116 if ((p = getenv("COLUMNS")) != NULL) 117 termwidth = atoi(p); 118 } 119 120 /* Root is -A automatically. */ 121 if (!getuid()) 122 f_listdot = 1; 123 124 fts_options = FTS_PHYSICAL; 125 while ((ch = getopt(argc, argv, "1ACFHLRSTacdfghiklmnopqrstux")) != -1) { 126 switch (ch) { 127 /* 128 * The -1, -C and -l, -m, -n and -x options all override each 129 * other so shell aliasing works right. 130 */ 131 case '1': 132 f_singlecol = 1; 133 f_column = f_columnacross = f_longform = 0; 134 f_numericonly = f_stream = 0; 135 break; 136 case 'C': 137 f_column = 1; 138 f_columnacross = f_longform = f_numericonly = 0; 139 f_singlecol = f_stream = 0; 140 break; 141 case 'g': 142 f_longform = 1; 143 if (f_grouponly != -1) 144 f_grouponly = 1; 145 f_column = f_columnacross = f_singlecol = f_stream = 0; 146 break; 147 case 'l': 148 f_longform = 1; 149 f_grouponly = -1; /* -l always overrides -g */ 150 f_column = f_columnacross = f_singlecol = f_stream = 0; 151 break; 152 case 'm': 153 f_stream = 1; 154 f_column = f_columnacross = f_longform = 0; 155 f_numericonly = f_singlecol = 0; 156 break; 157 case 'x': 158 f_columnacross = 1; 159 f_column = f_longform = f_numericonly = 0; 160 f_singlecol = f_stream = 0; 161 break; 162 case 'n': 163 f_longform = 1; 164 f_numericonly = 1; 165 f_column = f_columnacross = f_singlecol = f_stream = 0; 166 break; 167 /* The -c and -u options override each other. */ 168 case 'c': 169 f_statustime = 1; 170 f_accesstime = 0; 171 break; 172 case 'u': 173 f_accesstime = 1; 174 f_statustime = 0; 175 break; 176 case 'F': 177 f_type = 1; 178 break; 179 case 'H': 180 fts_options |= FTS_COMFOLLOW; 181 break; 182 case 'L': 183 fts_options &= ~FTS_PHYSICAL; 184 fts_options |= FTS_LOGICAL; 185 break; 186 case 'R': 187 f_recursive = 1; 188 break; 189 case 'f': 190 f_nosort = 1; 191 /* FALLTHROUGH */ 192 case 'a': 193 fts_options |= FTS_SEEDOT; 194 /* FALLTHROUGH */ 195 case 'A': 196 f_listdot = 1; 197 break; 198 /* The -d option turns off the -R option. */ 199 case 'd': 200 f_listdir = 1; 201 f_recursive = 0; 202 break; 203 case 'h': 204 f_humanval = 1; 205 break; 206 case 'i': 207 f_inode = 1; 208 break; 209 case 'k': 210 blocksize = 1024; 211 kflag = 1; 212 break; 213 case 'o': 214 f_flags = 1; 215 break; 216 case 'p': 217 f_typedir = 1; 218 break; 219 case 'q': 220 f_nonprint = 1; 221 break; 222 case 'r': 223 f_reversesort = 1; 224 break; 225 case 'S': 226 sortkey = BY_SIZE; 227 break; 228 case 's': 229 f_size = 1; 230 break; 231 case 'T': 232 f_sectime = 1; 233 break; 234 case 't': 235 sortkey = BY_TIME; 236 break; 237 default: 238 usage(); 239 } 240 } 241 argc -= optind; 242 argv += optind; 243 244 /* 245 * If both -g and -l options, let -l take precedence. 246 * This preserves compatibility with the historic BSD ls -lg. 247 */ 248 if (f_grouponly == -1) 249 f_grouponly = 0; 250 251 /* 252 * If not -F, -i, -l, -p, -S, -s or -t options, don't require stat 253 * information. 254 */ 255 if (!f_longform && !f_inode && !f_size && !f_type && !f_typedir && 256 sortkey == BY_NAME) 257 fts_options |= FTS_NOSTAT; 258 259 /* 260 * If not -F, -d or -l options, follow any symbolic links listed on 261 * the command line. 262 */ 263 if (!f_longform && !f_listdir && !f_type) 264 fts_options |= FTS_COMFOLLOW; 265 266 /* If -l or -s, figure out block size. */ 267 if (f_longform || f_size) { 268 if (!kflag) 269 (void)getbsize(¬used, &blocksize); 270 blocksize /= 512; 271 } 272 273 /* Select a sort function. */ 274 if (f_reversesort) { 275 switch (sortkey) { 276 case BY_NAME: 277 sortfcn = revnamecmp; 278 break; 279 case BY_SIZE: 280 sortfcn = revsizecmp; 281 break; 282 case BY_TIME: 283 if (f_accesstime) 284 sortfcn = revacccmp; 285 else if (f_statustime) 286 sortfcn = revstatcmp; 287 else /* Use modification time. */ 288 sortfcn = revmodcmp; 289 break; 290 } 291 } else { 292 switch (sortkey) { 293 case BY_NAME: 294 sortfcn = namecmp; 295 break; 296 case BY_SIZE: 297 sortfcn = sizecmp; 298 break; 299 case BY_TIME: 300 if (f_accesstime) 301 sortfcn = acccmp; 302 else if (f_statustime) 303 sortfcn = statcmp; 304 else /* Use modification time. */ 305 sortfcn = modcmp; 306 break; 307 } 308 } 309 310 /* Select a print function. */ 311 if (f_singlecol) 312 printfcn = printscol; 313 else if (f_columnacross) 314 printfcn = printacol; 315 else if (f_longform) 316 printfcn = printlong; 317 else if (f_stream) 318 printfcn = printstream; 319 else 320 printfcn = printcol; 321 322 if (argc) 323 traverse(argc, argv, fts_options); 324 else 325 traverse(1, dotav, fts_options); 326 return (rval); 327 } 328 329 static int output; /* If anything output. */ 330 331 /* 332 * Traverse() walks the logical directory structure specified by the argv list 333 * in the order specified by the mastercmp() comparison function. During the 334 * traversal it passes linked lists of structures to display() which represent 335 * a superset (may be exact set) of the files to be displayed. 336 */ 337 static void 338 traverse(int argc, char *argv[], int options) 339 { 340 FTS *ftsp; 341 FTSENT *p, *chp; 342 int ch_options, saved_errno; 343 344 if ((ftsp = 345 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 346 err(1, NULL); 347 348 display(NULL, fts_children(ftsp, 0)); 349 if (f_listdir) 350 return; 351 352 /* 353 * If not recursing down this tree and don't need stat info, just get 354 * the names. 355 */ 356 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 357 358 while ((p = fts_read(ftsp)) != NULL) 359 switch (p->fts_info) { 360 case FTS_D: 361 if (p->fts_name[0] == '.' && 362 p->fts_level != FTS_ROOTLEVEL && !f_listdot) 363 break; 364 365 /* 366 * If already output something, put out a newline as 367 * a separator. If multiple arguments, precede each 368 * directory with its name. 369 */ 370 if (output) 371 (void)printf("\n%s:\n", p->fts_path); 372 else if (argc > 1) { 373 (void)printf("%s:\n", p->fts_path); 374 output = 1; 375 } 376 377 chp = fts_children(ftsp, ch_options); 378 saved_errno = errno; 379 display(p, chp); 380 381 /* 382 * On fts_children() returning error do recurse to see 383 * the error. 384 */ 385 if (!f_recursive && !(chp == NULL && saved_errno != 0)) 386 (void)fts_set(ftsp, p, FTS_SKIP); 387 break; 388 case FTS_DC: 389 warnx("%s: directory causes a cycle", p->fts_name); 390 break; 391 case FTS_DNR: 392 case FTS_ERR: 393 warnx("%s: %s", p->fts_name[0] == '\0' ? p->fts_path : 394 p->fts_name, strerror(p->fts_errno)); 395 rval = 1; 396 break; 397 } 398 if (errno) 399 err(1, "fts_read"); 400 } 401 402 /* 403 * Display() takes a linked list of FTSENT structures and passes the list 404 * along with any other necessary information to the print function. P 405 * points to the parent directory of the display list. 406 */ 407 static void 408 display(FTSENT *p, FTSENT *list) 409 { 410 struct stat *sp; 411 DISPLAY d; 412 FTSENT *cur; 413 NAMES *np; 414 off_t maxsize; 415 u_long maxlen, maxnlink; 416 unsigned long long btotal, maxblock; 417 ino_t maxinode; 418 int bcfile, flen, glen, ulen, maxflags, maxgroup, maxuser; 419 int entries, needstats; 420 char *user, *group, buf[21]; /* 64 bits == 20 digits */ 421 char nuser[12], ngroup[12]; 422 char *flags = NULL; 423 424 /* 425 * If list is NULL there are two possibilities: that the parent 426 * directory p has no children, or that fts_children() returned an 427 * error. We ignore the error case since it will be replicated 428 * on the next call to fts_read() on the post-order visit to the 429 * directory p, and will be signalled in traverse(). 430 */ 431 if (list == NULL) 432 return; 433 434 needstats = f_inode || f_longform || f_size; 435 flen = 0; 436 btotal = maxblock = maxinode = maxlen = maxnlink = 0; 437 bcfile = 0; 438 maxuser = maxgroup = maxflags = 0; 439 maxsize = 0; 440 for (cur = list, entries = 0; cur != NULL; cur = cur->fts_link) { 441 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 442 warnx("%s: %s", 443 cur->fts_name, strerror(cur->fts_errno)); 444 cur->fts_number = NO_PRINT; 445 rval = 1; 446 continue; 447 } 448 449 /* 450 * P is NULL if list is the argv list, to which different rules 451 * apply. 452 */ 453 if (p == NULL) { 454 /* Directories will be displayed later. */ 455 if (cur->fts_info == FTS_D && !f_listdir) { 456 cur->fts_number = NO_PRINT; 457 continue; 458 } 459 } else { 460 /* Only display dot file if -a/-A set. */ 461 if (cur->fts_name[0] == '.' && !f_listdot) { 462 cur->fts_number = NO_PRINT; 463 continue; 464 } 465 } 466 if (cur->fts_namelen > maxlen) 467 maxlen = cur->fts_namelen; 468 if (needstats) { 469 sp = cur->fts_statp; 470 if (sp->st_blocks > maxblock) 471 maxblock = sp->st_blocks; 472 if (sp->st_ino > maxinode) 473 maxinode = sp->st_ino; 474 if (sp->st_nlink > maxnlink) 475 maxnlink = sp->st_nlink; 476 if (sp->st_size > maxsize) 477 maxsize = sp->st_size; 478 479 btotal += sp->st_blocks; 480 if (f_longform) { 481 if (f_numericonly) { 482 snprintf(nuser, 12, "%u", sp->st_uid); 483 snprintf(ngroup, 12, "%u", sp->st_gid); 484 user = nuser; 485 group = ngroup; 486 } else { 487 user = user_from_uid(sp->st_uid, 0); 488 group = group_from_gid(sp->st_gid, 0); 489 } 490 if ((ulen = strlen(user)) > maxuser) 491 maxuser = ulen; 492 if ((glen = strlen(group)) > maxgroup) 493 maxgroup = glen; 494 if (f_flags) { 495 flags = fflagstostr(sp->st_flags); 496 if (*flags == '\0') 497 flags = "-"; 498 if ((flen = strlen(flags)) > maxflags) 499 maxflags = flen; 500 } else 501 flen = 0; 502 503 if ((np = malloc(sizeof(NAMES) + 504 ulen + 1 + glen + 1 + flen + 1)) == NULL) 505 err(1, NULL); 506 507 np->user = &np->data[0]; 508 (void)strlcpy(np->user, user, ulen + 1); 509 np->group = &np->data[ulen + 1]; 510 (void)strlcpy(np->group, group, glen + 1); 511 512 if (S_ISCHR(sp->st_mode) || 513 S_ISBLK(sp->st_mode)) 514 bcfile = 1; 515 516 if (f_flags) { 517 np->flags = &np->data[ulen + 1 + glen + 1]; 518 (void)strlcpy(np->flags, flags, flen + 1); 519 if (*flags != '-') 520 free(flags); 521 } 522 cur->fts_pointer = np; 523 } 524 } 525 ++entries; 526 } 527 528 if (!entries) 529 return; 530 531 d.list = list; 532 d.entries = entries; 533 d.maxlen = maxlen; 534 if (needstats) { 535 d.bcfile = bcfile; 536 d.btotal = btotal; 537 (void)snprintf(buf, sizeof(buf), "%llu", maxblock); 538 d.s_block = strlen(buf); 539 d.s_flags = maxflags; 540 d.s_group = maxgroup; 541 (void)snprintf(buf, sizeof(buf), "%llu", 542 (unsigned long long)maxinode); 543 d.s_inode = strlen(buf); 544 (void)snprintf(buf, sizeof(buf), "%lu", maxnlink); 545 d.s_nlink = strlen(buf); 546 if (!f_humanval) { 547 (void)snprintf(buf, sizeof(buf), "%lld", 548 (long long) maxsize); 549 d.s_size = strlen(buf); 550 } else 551 d.s_size = FMT_SCALED_STRSIZE-2; /* no - or '\0' */ 552 d.s_user = maxuser; 553 } 554 555 printfcn(&d); 556 output = 1; 557 558 if (f_longform) 559 for (cur = list; cur != NULL; cur = cur->fts_link) 560 free(cur->fts_pointer); 561 } 562 563 /* 564 * Ordering for mastercmp: 565 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 566 * as larger than directories. Within either group, use the sort function. 567 * All other levels use the sort function. Error entries remain unsorted. 568 */ 569 static int 570 mastercmp(const FTSENT **a, const FTSENT **b) 571 { 572 int a_info, b_info; 573 574 a_info = (*a)->fts_info; 575 if (a_info == FTS_ERR) 576 return (0); 577 b_info = (*b)->fts_info; 578 if (b_info == FTS_ERR) 579 return (0); 580 581 if (a_info == FTS_NS || b_info == FTS_NS) { 582 if (b_info != FTS_NS) 583 return (1); 584 else if (a_info != FTS_NS) 585 return (-1); 586 else 587 return (namecmp(*a, *b)); 588 } 589 590 if (a_info != b_info && 591 (*a)->fts_level == FTS_ROOTLEVEL && !f_listdir) { 592 if (a_info == FTS_D) 593 return (1); 594 if (b_info == FTS_D) 595 return (-1); 596 } 597 return (sortfcn(*a, *b)); 598 } 599