ls.c revision 1.66
1/* $NetBSD: ls.c,v 1.66 2009/02/14 08:02:04 lukem Exp $ */ 2 3/* 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Michael Fischbein. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#ifndef lint 37__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\ 38 The Regents of the University of California. All rights reserved."); 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)ls.c 8.7 (Berkeley) 8/5/94"; 44#else 45__RCSID("$NetBSD: ls.c,v 1.66 2009/02/14 08:02:04 lukem Exp $"); 46#endif 47#endif /* not lint */ 48 49#include <sys/types.h> 50#include <sys/stat.h> 51#include <sys/ioctl.h> 52 53#include <dirent.h> 54#include <err.h> 55#include <errno.h> 56#include <fts.h> 57#include <locale.h> 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include <unistd.h> 62#include <termios.h> 63#include <pwd.h> 64#include <grp.h> 65#include <util.h> 66 67#include "ls.h" 68#include "extern.h" 69 70static void display(FTSENT *, FTSENT *); 71static int mastercmp(const FTSENT **, const FTSENT **); 72static void traverse(int, char **, int); 73 74static void (*printfcn)(DISPLAY *); 75static int (*sortfcn)(const FTSENT *, const FTSENT *); 76 77#define BY_NAME 0 78#define BY_SIZE 1 79#define BY_TIME 2 80 81long blocksize; /* block size units */ 82int termwidth = 80; /* default terminal width */ 83int sortkey = BY_NAME; 84int rval = EXIT_SUCCESS; /* exit value - set if error encountered */ 85 86/* flags */ 87int f_accesstime; /* use time of last access */ 88int f_column; /* columnated format */ 89int f_columnacross; /* columnated format, sorted across */ 90int f_flags; /* show flags associated with a file */ 91int f_grouponly; /* long listing without owner */ 92int f_humanize; /* humanize the size field */ 93int f_inode; /* print inode */ 94int f_listdir; /* list actual directory, not contents */ 95int f_listdot; /* list files beginning with . */ 96int f_longform; /* long listing format */ 97int f_nonprint; /* show unprintables as ? */ 98int f_nosort; /* don't sort output */ 99int f_numericonly; /* don't convert uid/gid to name */ 100int f_octal; /* print octal escapes for nongraphic characters */ 101int f_octal_escape; /* like f_octal but use C escapes if possible */ 102int f_recursive; /* ls subdirectories also */ 103int f_reversesort; /* reverse whatever sort is used */ 104int f_sectime; /* print the real time for all files */ 105int f_singlecol; /* use single column output */ 106int f_size; /* list size in short listing */ 107int f_statustime; /* use time of last mode change */ 108int f_stream; /* stream format */ 109int f_type; /* add type character for non-regular files */ 110int f_typedir; /* add type character for directories */ 111int f_whiteout; /* show whiteout entries */ 112 113int 114ls_main(int argc, char *argv[]) 115{ 116 static char dot[] = ".", *dotav[] = { dot, NULL }; 117 struct winsize win; 118 int ch, fts_options; 119 int kflag = 0; 120 const char *p; 121 122 setprogname(argv[0]); 123 (void)setlocale(LC_ALL, ""); 124 125 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 126 if (isatty(STDOUT_FILENO)) { 127 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 128 win.ws_col > 0) 129 termwidth = win.ws_col; 130 f_column = f_nonprint = 1; 131 } else 132 f_singlecol = 1; 133 134 /* Root is -A automatically. */ 135 if (!getuid()) 136 f_listdot = 1; 137 138 fts_options = FTS_PHYSICAL; 139 while ((ch = getopt(argc, argv, "1ABCFLRSTWabcdfghiklmnopqrstuwx")) != -1) { 140 switch (ch) { 141 /* 142 * The -1, -C, -l, -m and -x options all override each other so 143 * shell aliasing works correctly. 144 */ 145 case '1': 146 f_singlecol = 1; 147 f_column = f_columnacross = f_longform = f_stream = 0; 148 break; 149 case 'C': 150 f_column = 1; 151 f_columnacross = f_longform = f_singlecol = f_stream = 152 0; 153 break; 154 case 'g': 155 if (f_grouponly != -1) 156 f_grouponly = 1; 157 f_longform = 1; 158 f_column = f_columnacross = f_singlecol = f_stream = 0; 159 break; 160 case 'l': 161 f_longform = 1; 162 f_column = f_columnacross = f_singlecol = f_stream = 0; 163 /* Never let -g take precedence over -l. */ 164 f_grouponly = -1; 165 break; 166 case 'm': 167 f_stream = 1; 168 f_column = f_columnacross = f_longform = f_singlecol = 169 0; 170 break; 171 case 'x': 172 f_columnacross = 1; 173 f_column = f_longform = f_singlecol = f_stream = 0; 174 break; 175 /* The -c and -u options override each other. */ 176 case 'c': 177 f_statustime = 1; 178 f_accesstime = 0; 179 break; 180 case 'u': 181 f_accesstime = 1; 182 f_statustime = 0; 183 break; 184 case 'F': 185 f_type = 1; 186 break; 187 case 'L': 188 fts_options &= ~FTS_PHYSICAL; 189 fts_options |= FTS_LOGICAL; 190 break; 191 case 'R': 192 f_recursive = 1; 193 break; 194 case 'a': 195 fts_options |= FTS_SEEDOT; 196 /* FALLTHROUGH */ 197 case 'A': 198 f_listdot = 1; 199 break; 200 /* The -B option turns off the -b, -q and -w options. */ 201 case 'B': 202 f_nonprint = 0; 203 f_octal = 1; 204 f_octal_escape = 0; 205 break; 206 /* The -b option turns off the -B, -q and -w options. */ 207 case 'b': 208 f_nonprint = 0; 209 f_octal = 0; 210 f_octal_escape = 1; 211 break; 212 /* The -d option turns off the -R option. */ 213 case 'd': 214 f_listdir = 1; 215 f_recursive = 0; 216 break; 217 case 'f': 218 f_nosort = 1; 219 break; 220 case 'i': 221 f_inode = 1; 222 break; 223 case 'k': 224 blocksize = 1024; 225 kflag = 1; 226 f_humanize = 0; 227 break; 228 /* The -h option forces all sizes to be measured in bytes. */ 229 case 'h': 230 f_humanize = 1; 231 kflag = 0; 232 break; 233 case 'n': 234 f_numericonly = 1; 235 f_longform = 1; 236 f_column = f_columnacross = f_singlecol = f_stream = 0; 237 break; 238 case 'o': 239 f_flags = 1; 240 break; 241 case 'p': 242 f_typedir = 1; 243 break; 244 /* The -q option turns off the -B, -b and -w options. */ 245 case 'q': 246 f_nonprint = 1; 247 f_octal = 0; 248 f_octal_escape = 0; 249 break; 250 case 'r': 251 f_reversesort = 1; 252 break; 253 case 'S': 254 sortkey = BY_SIZE; 255 break; 256 case 's': 257 f_size = 1; 258 break; 259 case 'T': 260 f_sectime = 1; 261 break; 262 case 't': 263 sortkey = BY_TIME; 264 break; 265 case 'W': 266 f_whiteout = 1; 267 break; 268 /* The -w option turns off the -B, -b and -q options. */ 269 case 'w': 270 f_nonprint = 0; 271 f_octal = 0; 272 f_octal_escape = 0; 273 break; 274 default: 275 case '?': 276 usage(); 277 } 278 } 279 argc -= optind; 280 argv += optind; 281 282 if (f_column || f_columnacross || f_stream) { 283 if ((p = getenv("COLUMNS")) != NULL) 284 termwidth = atoi(p); 285 } 286 287 /* 288 * If both -g and -l options, let -l take precedence. 289 */ 290 if (f_grouponly == -1) 291 f_grouponly = 0; 292 293 /* 294 * If not -F, -i, -l, -p, -S, -s or -t options, don't require stat 295 * information. 296 */ 297 if (!f_inode && !f_longform && !f_size && !f_type && !f_typedir && 298 sortkey == BY_NAME) 299 fts_options |= FTS_NOSTAT; 300 301 /* 302 * If not -F, -d or -l options, follow any symbolic links listed on 303 * the command line. 304 */ 305 if (!f_longform && !f_listdir && !f_type) 306 fts_options |= FTS_COMFOLLOW; 307 308 /* 309 * If -W, show whiteout entries 310 */ 311#ifdef FTS_WHITEOUT 312 if (f_whiteout) 313 fts_options |= FTS_WHITEOUT; 314#endif 315 316 /* If -l or -s, figure out block size. */ 317 if (f_inode || f_longform || f_size) { 318 if (!kflag) 319 (void)getbsize(NULL, &blocksize); 320 blocksize /= 512; 321 } 322 323 /* Select a sort function. */ 324 if (f_reversesort) { 325 switch (sortkey) { 326 case BY_NAME: 327 sortfcn = revnamecmp; 328 break; 329 case BY_SIZE: 330 sortfcn = revsizecmp; 331 break; 332 case BY_TIME: 333 if (f_accesstime) 334 sortfcn = revacccmp; 335 else if (f_statustime) 336 sortfcn = revstatcmp; 337 else /* Use modification time. */ 338 sortfcn = revmodcmp; 339 break; 340 } 341 } else { 342 switch (sortkey) { 343 case BY_NAME: 344 sortfcn = namecmp; 345 break; 346 case BY_SIZE: 347 sortfcn = sizecmp; 348 break; 349 case BY_TIME: 350 if (f_accesstime) 351 sortfcn = acccmp; 352 else if (f_statustime) 353 sortfcn = statcmp; 354 else /* Use modification time. */ 355 sortfcn = modcmp; 356 break; 357 } 358 } 359 360 /* Select a print function. */ 361 if (f_singlecol) 362 printfcn = printscol; 363 else if (f_columnacross) 364 printfcn = printacol; 365 else if (f_longform) 366 printfcn = printlong; 367 else if (f_stream) 368 printfcn = printstream; 369 else 370 printfcn = printcol; 371 372 if (argc) 373 traverse(argc, argv, fts_options); 374 else 375 traverse(1, dotav, fts_options); 376 return rval; 377 /* NOTREACHED */ 378} 379 380static int output; /* If anything output. */ 381 382/* 383 * Traverse() walks the logical directory structure specified by the argv list 384 * in the order specified by the mastercmp() comparison function. During the 385 * traversal it passes linked lists of structures to display() which represent 386 * a superset (may be exact set) of the files to be displayed. 387 */ 388static void 389traverse(int argc, char *argv[], int options) 390{ 391 FTS *ftsp; 392 FTSENT *p, *chp; 393 int ch_options, error; 394 395 if ((ftsp = 396 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 397 err(EXIT_FAILURE, NULL); 398 399 display(NULL, fts_children(ftsp, 0)); 400 if (f_listdir) { 401 (void)fts_close(ftsp); 402 return; 403 } 404 405 /* 406 * If not recursing down this tree and don't need stat info, just get 407 * the names. 408 */ 409 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 410 411 while ((p = fts_read(ftsp)) != NULL) 412 switch (p->fts_info) { 413 case FTS_DC: 414 warnx("%s: directory causes a cycle", p->fts_name); 415 break; 416 case FTS_DNR: 417 case FTS_ERR: 418 warnx("%s: %s", p->fts_name, strerror(p->fts_errno)); 419 rval = EXIT_FAILURE; 420 break; 421 case FTS_D: 422 if (p->fts_level != FTS_ROOTLEVEL && 423 p->fts_name[0] == '.' && !f_listdot) 424 break; 425 426 /* 427 * If already output something, put out a newline as 428 * a separator. If multiple arguments, precede each 429 * directory with its name. 430 */ 431 if (output) 432 (void)printf("\n%s:\n", p->fts_path); 433 else if (argc > 1) { 434 (void)printf("%s:\n", p->fts_path); 435 output = 1; 436 } 437 438 chp = fts_children(ftsp, ch_options); 439 display(p, chp); 440 441 if (!f_recursive && chp != NULL) 442 (void)fts_set(ftsp, p, FTS_SKIP); 443 break; 444 } 445 error = errno; 446 (void)fts_close(ftsp); 447 errno = error; 448 if (errno) 449 err(EXIT_FAILURE, "fts_read"); 450} 451 452/* 453 * Display() takes a linked list of FTSENT structures and passes the list 454 * along with any other necessary information to the print function. P 455 * points to the parent directory of the display list. 456 */ 457static void 458display(FTSENT *p, FTSENT *list) 459{ 460 struct stat *sp; 461 DISPLAY d; 462 FTSENT *cur; 463 NAMES *np; 464 u_int64_t btotal, stotal; 465 off_t maxsize; 466 blkcnt_t maxblock; 467 ino_t maxinode; 468 int maxmajor, maxminor; 469 uint32_t maxnlink; 470 int bcfile, entries, flen, glen, ulen, maxflags, maxgroup; 471 unsigned int maxlen; 472 int maxuser, needstats; 473 const char *user, *group; 474 char buf[21]; /* 64 bits == 20 digits, +1 for NUL */ 475 char nuser[12], ngroup[12]; 476 char *flags = NULL; 477 478 /* 479 * If list is NULL there are two possibilities: that the parent 480 * directory p has no children, or that fts_children() returned an 481 * error. We ignore the error case since it will be replicated 482 * on the next call to fts_read() on the post-order visit to the 483 * directory p, and will be signalled in traverse(). 484 */ 485 if (list == NULL) 486 return; 487 488 needstats = f_inode || f_longform || f_size; 489 flen = 0; 490 maxinode = maxnlink = 0; 491 bcfile = 0; 492 maxuser = maxgroup = maxflags = maxlen = 0; 493 btotal = stotal = maxblock = maxsize = 0; 494 maxmajor = maxminor = 0; 495 for (cur = list, entries = 0; cur; cur = cur->fts_link) { 496 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 497 warnx("%s: %s", 498 cur->fts_name, strerror(cur->fts_errno)); 499 cur->fts_number = NO_PRINT; 500 rval = EXIT_FAILURE; 501 continue; 502 } 503 504 /* 505 * P is NULL if list is the argv list, to which different rules 506 * apply. 507 */ 508 if (p == NULL) { 509 /* Directories will be displayed later. */ 510 if (cur->fts_info == FTS_D && !f_listdir) { 511 cur->fts_number = NO_PRINT; 512 continue; 513 } 514 } else { 515 /* Only display dot file if -a/-A set. */ 516 if (cur->fts_name[0] == '.' && !f_listdot) { 517 cur->fts_number = NO_PRINT; 518 continue; 519 } 520 } 521 if (cur->fts_namelen > maxlen) 522 maxlen = cur->fts_namelen; 523 if (needstats) { 524 sp = cur->fts_statp; 525 if (sp->st_blocks > maxblock) 526 maxblock = sp->st_blocks; 527 if (sp->st_ino > maxinode) 528 maxinode = sp->st_ino; 529 if (sp->st_nlink > maxnlink) 530 maxnlink = sp->st_nlink; 531 if (sp->st_size > maxsize) 532 maxsize = sp->st_size; 533 if (S_ISCHR(sp->st_mode) || S_ISBLK(sp->st_mode)) { 534 bcfile = 1; 535 if (major(sp->st_rdev) > maxmajor) 536 maxmajor = major(sp->st_rdev); 537 if (minor(sp->st_rdev) > maxminor) 538 maxminor = minor(sp->st_rdev); 539 } 540 541 btotal += sp->st_blocks; 542 stotal += sp->st_size; 543 if (f_longform) { 544 if (f_numericonly || 545 (user = user_from_uid(sp->st_uid, 0)) == 546 NULL) { 547 (void)snprintf(nuser, sizeof(nuser), 548 "%u", sp->st_uid); 549 user = nuser; 550 } 551 if (f_numericonly || 552 (group = group_from_gid(sp->st_gid, 0)) == 553 NULL) { 554 (void)snprintf(ngroup, sizeof(ngroup), 555 "%u", sp->st_gid); 556 group = ngroup; 557 } 558 if ((ulen = strlen(user)) > maxuser) 559 maxuser = ulen; 560 if ((glen = strlen(group)) > maxgroup) 561 maxgroup = glen; 562 if (f_flags) { 563 flags = 564 flags_to_string((u_long)sp->st_flags, "-"); 565 if ((flen = strlen(flags)) > maxflags) 566 maxflags = flen; 567 } else 568 flen = 0; 569 570 if ((np = malloc(sizeof(NAMES) + 571 ulen + glen + flen + 2)) == NULL) 572 err(EXIT_FAILURE, NULL); 573 574 np->user = &np->data[0]; 575 (void)strcpy(np->user, user); 576 np->group = &np->data[ulen + 1]; 577 (void)strcpy(np->group, group); 578 579 if (f_flags) { 580 np->flags = &np->data[ulen + glen + 2]; 581 (void)strcpy(np->flags, flags); 582 free(flags); 583 } 584 cur->fts_pointer = np; 585 } 586 } 587 ++entries; 588 } 589 590 if (!entries) 591 return; 592 593 d.list = list; 594 d.entries = entries; 595 d.maxlen = maxlen; 596 if (needstats) { 597 d.btotal = btotal; 598 d.stotal = stotal; 599 if (f_humanize) { 600 d.s_block = 4; /* min buf length for humanize_number */ 601 } else { 602 (void)snprintf(buf, sizeof(buf), "%llu", 603 (long long)howmany(maxblock, blocksize)); 604 d.s_block = strlen(buf); 605 } 606 d.s_flags = maxflags; 607 d.s_group = maxgroup; 608 (void)snprintf(buf, sizeof(buf), "%llu", 609 (unsigned long long)maxinode); 610 d.s_inode = strlen(buf); 611 (void)snprintf(buf, sizeof(buf), "%u", maxnlink); 612 d.s_nlink = strlen(buf); 613 if (f_humanize) { 614 d.s_size = 4; /* min buf length for humanize_number */ 615 } else { 616 (void)snprintf(buf, sizeof(buf), "%llu", 617 (long long)maxsize); 618 d.s_size = strlen(buf); 619 } 620 d.s_user = maxuser; 621 if (bcfile) { 622 (void)snprintf(buf, sizeof(buf), "%u", maxmajor); 623 d.s_major = strlen(buf); 624 (void)snprintf(buf, sizeof(buf), "%u", maxminor); 625 d.s_minor = strlen(buf); 626 if (d.s_major + d.s_minor + 2 > d.s_size) 627 d.s_size = d.s_major + d.s_minor + 2; 628 else if (d.s_size - d.s_minor - 2 > d.s_major) 629 d.s_major = d.s_size - d.s_minor - 2; 630 } else { 631 d.s_major = 0; 632 d.s_minor = 0; 633 } 634 } 635 636 printfcn(&d); 637 output = 1; 638 639 if (f_longform) 640 for (cur = list; cur; cur = cur->fts_link) 641 free(cur->fts_pointer); 642} 643 644/* 645 * Ordering for mastercmp: 646 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 647 * as larger than directories. Within either group, use the sort function. 648 * All other levels use the sort function. Error entries remain unsorted. 649 */ 650static int 651mastercmp(const FTSENT **a, const FTSENT **b) 652{ 653 int a_info, b_info; 654 655 a_info = (*a)->fts_info; 656 if (a_info == FTS_ERR) 657 return (0); 658 b_info = (*b)->fts_info; 659 if (b_info == FTS_ERR) 660 return (0); 661 662 if (a_info == FTS_NS || b_info == FTS_NS) { 663 if (b_info != FTS_NS) 664 return (1); 665 else if (a_info != FTS_NS) 666 return (-1); 667 else 668 return (namecmp(*a, *b)); 669 } 670 671 if (a_info != b_info && !f_listdir && 672 (*a)->fts_level == FTS_ROOTLEVEL) { 673 if (a_info == FTS_D) 674 return (1); 675 else if (b_info == FTS_D) 676 return (-1); 677 } 678 return (sortfcn(*a, *b)); 679} 680