ls.c revision 1.54
1/* $NetBSD: ls.c,v 1.54 2003/12/26 10:47:32 simonb 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\n\ 38 The Regents of the University of California. All rights reserved.\n"); 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 1.54 2003/12/26 10:47:32 simonb 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 66#include "ls.h" 67#include "extern.h" 68 69static void display(FTSENT *, FTSENT *); 70static int mastercmp(const FTSENT **, const FTSENT **); 71static void traverse(int, char **, int); 72 73static void (*printfcn)(DISPLAY *); 74static int (*sortfcn)(const FTSENT *, const FTSENT *); 75 76#define BY_NAME 0 77#define BY_SIZE 1 78#define BY_TIME 2 79 80long blocksize; /* block size units */ 81int termwidth = 80; /* default terminal width */ 82int sortkey = BY_NAME; 83int rval = EXIT_SUCCESS; /* exit value - set if error encountered */ 84 85/* flags */ 86int f_accesstime; /* use time of last access */ 87int f_column; /* columnated format */ 88int f_columnacross; /* columnated format, sorted across */ 89int f_flags; /* show flags associated with a file */ 90int f_grouponly; /* long listing without owner */ 91int f_humanize; /* humanize the size field */ 92int f_inode; /* print inode */ 93int f_listdir; /* list actual directory, not contents */ 94int f_listdot; /* list files beginning with . */ 95int f_longform; /* long listing format */ 96int f_nonprint; /* show unprintables as ? */ 97int f_nosort; /* don't sort output */ 98int f_numericonly; /* don't convert uid/gid to name */ 99int f_octal; /* print octal escapes for nongraphic characters */ 100int f_octal_escape; /* like f_octal but use C escapes if possible */ 101int f_recursive; /* ls subdirectories also */ 102int f_reversesort; /* reverse whatever sort is used */ 103int f_sectime; /* print the real time for all files */ 104int f_singlecol; /* use single column output */ 105int f_size; /* list size in short listing */ 106int f_statustime; /* use time of last mode change */ 107int f_stream; /* stream format */ 108int f_type; /* add type character for non-regular files */ 109int f_typedir; /* add type character for directories */ 110int f_whiteout; /* show whiteout entries */ 111 112int 113ls_main(int argc, char *argv[]) 114{ 115 static char dot[] = ".", *dotav[] = { dot, NULL }; 116 struct winsize win; 117 int ch, fts_options; 118 int kflag = 0; 119 const char *p; 120 121 setlocale(LC_ALL, ""); 122 123 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 124 if (isatty(STDOUT_FILENO)) { 125 if ((p = getenv("COLUMNS")) != NULL) 126 termwidth = atoi(p); 127 else 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 break; 227 /* 228 * The -h option forces all sizes to be measured in bytes. 229 * It also makes -l suppress -s. 230 */ 231 case 'h': 232 f_humanize = 1; 233 break; 234 case 'n': 235 f_numericonly = 1; 236 break; 237 case 'o': 238 f_flags = 1; 239 break; 240 case 'p': 241 f_typedir = 1; 242 break; 243 /* the -q option turns off the -B, -b and -w options. */ 244 case 'q': 245 f_nonprint = 1; 246 f_octal = 0; 247 f_octal_escape = 0; 248 break; 249 case 'r': 250 f_reversesort = 1; 251 break; 252 case 'S': 253 sortkey = BY_SIZE; 254 break; 255 case 's': 256 f_size = 1; 257 break; 258 case 'T': 259 f_sectime = 1; 260 break; 261 case 't': 262 sortkey = BY_TIME; 263 break; 264 case 'W': 265 f_whiteout = 1; 266 break; 267 /* the -w option turns off the -B, -b and -q options. */ 268 case 'w': 269 f_nonprint = 0; 270 f_octal = 0; 271 f_octal_escape = 0; 272 break; 273 default: 274 case '?': 275 usage(); 276 } 277 } 278 argc -= optind; 279 argv += optind; 280 281 /* 282 * If both -g and -l options, let -l take precedence. 283 */ 284 if (f_grouponly == -1) 285 f_grouponly = 0; 286 287 /* 288 * If not -F, -i, -l, -p, -S, -s or -t options, don't require stat 289 * information. 290 */ 291 if (!f_inode && !f_longform && !f_size && !f_type && !f_typedir && 292 sortkey == BY_NAME) 293 fts_options |= FTS_NOSTAT; 294 295 /* 296 * If not -F, -d or -l options, follow any symbolic links listed on 297 * the command line. 298 */ 299 if (!f_longform && !f_listdir && !f_type) 300 fts_options |= FTS_COMFOLLOW; 301 302 /* 303 * If -W, show whiteout entries 304 */ 305#ifdef FTS_WHITEOUT 306 if (f_whiteout) 307 fts_options |= FTS_WHITEOUT; 308#endif 309 310 /* If -l or -s, figure out block size. */ 311 if (f_inode || f_longform || f_size) { 312 if (!kflag) 313 (void)getbsize(NULL, &blocksize); 314 blocksize /= 512; 315 } 316 317 /* Select a sort function. */ 318 if (f_reversesort) { 319 switch (sortkey) { 320 case BY_NAME: 321 sortfcn = revnamecmp; 322 break; 323 case BY_SIZE: 324 sortfcn = revsizecmp; 325 break; 326 case BY_TIME: 327 if (f_accesstime) 328 sortfcn = revacccmp; 329 else if (f_statustime) 330 sortfcn = revstatcmp; 331 else /* Use modification time. */ 332 sortfcn = revmodcmp; 333 break; 334 } 335 } else { 336 switch (sortkey) { 337 case BY_NAME: 338 sortfcn = namecmp; 339 break; 340 case BY_SIZE: 341 sortfcn = sizecmp; 342 break; 343 case BY_TIME: 344 if (f_accesstime) 345 sortfcn = acccmp; 346 else if (f_statustime) 347 sortfcn = statcmp; 348 else /* Use modification time. */ 349 sortfcn = modcmp; 350 break; 351 } 352 } 353 354 /* Select a print function. */ 355 if (f_singlecol) 356 printfcn = printscol; 357 else if (f_columnacross) 358 printfcn = printacol; 359 else if (f_longform) 360 printfcn = printlong; 361 else if (f_stream) 362 printfcn = printstream; 363 else 364 printfcn = printcol; 365 366 if (argc) 367 traverse(argc, argv, fts_options); 368 else 369 traverse(1, dotav, fts_options); 370 exit(rval); 371 /* NOTREACHED */ 372} 373 374static int output; /* If anything output. */ 375 376/* 377 * Traverse() walks the logical directory structure specified by the argv list 378 * in the order specified by the mastercmp() comparison function. During the 379 * traversal it passes linked lists of structures to display() which represent 380 * a superset (may be exact set) of the files to be displayed. 381 */ 382static void 383traverse(int argc, char *argv[], int options) 384{ 385 FTS *ftsp; 386 FTSENT *p, *chp; 387 int ch_options; 388 389 if ((ftsp = 390 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 391 err(EXIT_FAILURE, NULL); 392 393 display(NULL, fts_children(ftsp, 0)); 394 if (f_listdir) 395 return; 396 397 /* 398 * If not recursing down this tree and don't need stat info, just get 399 * the names. 400 */ 401 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 402 403 while ((p = fts_read(ftsp)) != NULL) 404 switch (p->fts_info) { 405 case FTS_DC: 406 warnx("%s: directory causes a cycle", p->fts_name); 407 break; 408 case FTS_DNR: 409 case FTS_ERR: 410 warnx("%s: %s", p->fts_name, strerror(p->fts_errno)); 411 rval = EXIT_FAILURE; 412 break; 413 case FTS_D: 414 if (p->fts_level != FTS_ROOTLEVEL && 415 p->fts_name[0] == '.' && !f_listdot) 416 break; 417 418 /* 419 * If already output something, put out a newline as 420 * a separator. If multiple arguments, precede each 421 * directory with its name. 422 */ 423 if (output) 424 (void)printf("\n%s:\n", p->fts_path); 425 else if (argc > 1) { 426 (void)printf("%s:\n", p->fts_path); 427 output = 1; 428 } 429 430 chp = fts_children(ftsp, ch_options); 431 display(p, chp); 432 433 if (!f_recursive && chp != NULL) 434 (void)fts_set(ftsp, p, FTS_SKIP); 435 break; 436 } 437 if (errno) 438 err(EXIT_FAILURE, "fts_read"); 439} 440 441/* 442 * Display() takes a linked list of FTSENT structures and passes the list 443 * along with any other necessary information to the print function. P 444 * points to the parent directory of the display list. 445 */ 446static void 447display(FTSENT *p, FTSENT *list) 448{ 449 struct stat *sp; 450 DISPLAY d; 451 FTSENT *cur; 452 NAMES *np; 453 u_int64_t btotal, stotal, maxblock, maxsize; 454 int maxinode, maxnlink, maxmajor, maxminor; 455 int bcfile, entries, flen, glen, ulen, maxflags, maxgroup, maxlen; 456 int maxuser, needstats; 457 const char *user, *group; 458 char buf[21]; /* 64 bits == 20 digits, +1 for NUL */ 459 char nuser[12], ngroup[12]; 460 char *flags = NULL; 461 462#ifdef __GNUC__ 463 /* This outrageous construct just to shut up a GCC warning. */ 464 (void) &maxsize; 465#endif 466 467 /* 468 * If list is NULL there are two possibilities: that the parent 469 * directory p has no children, or that fts_children() returned an 470 * error. We ignore the error case since it will be replicated 471 * on the next call to fts_read() on the post-order visit to the 472 * directory p, and will be signalled in traverse(). 473 */ 474 if (list == NULL) 475 return; 476 477 needstats = f_inode || f_longform || f_size; 478 flen = 0; 479 maxinode = maxnlink = 0; 480 bcfile = 0; 481 maxuser = maxgroup = maxflags = maxlen = 0; 482 btotal = stotal = maxblock = maxsize = 0; 483 maxmajor = maxminor = 0; 484 for (cur = list, entries = 0; cur; cur = cur->fts_link) { 485 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 486 warnx("%s: %s", 487 cur->fts_name, strerror(cur->fts_errno)); 488 cur->fts_number = NO_PRINT; 489 rval = EXIT_FAILURE; 490 continue; 491 } 492 493 /* 494 * P is NULL if list is the argv list, to which different rules 495 * apply. 496 */ 497 if (p == NULL) { 498 /* Directories will be displayed later. */ 499 if (cur->fts_info == FTS_D && !f_listdir) { 500 cur->fts_number = NO_PRINT; 501 continue; 502 } 503 } else { 504 /* Only display dot file if -a/-A set. */ 505 if (cur->fts_name[0] == '.' && !f_listdot) { 506 cur->fts_number = NO_PRINT; 507 continue; 508 } 509 } 510 if (cur->fts_namelen > maxlen) 511 maxlen = cur->fts_namelen; 512 if (needstats) { 513 sp = cur->fts_statp; 514 if (sp->st_blocks > maxblock) 515 maxblock = sp->st_blocks; 516 if (sp->st_ino > maxinode) 517 maxinode = sp->st_ino; 518 if (sp->st_nlink > maxnlink) 519 maxnlink = sp->st_nlink; 520 if (sp->st_size > maxsize) 521 maxsize = sp->st_size; 522 if (S_ISCHR(sp->st_mode) || S_ISBLK(sp->st_mode)) { 523 bcfile = 1; 524 if (major(sp->st_rdev) > maxmajor) 525 maxmajor = major(sp->st_rdev); 526 if (minor(sp->st_rdev) > maxminor) 527 maxminor = minor(sp->st_rdev); 528 } 529 530 btotal += sp->st_blocks; 531 stotal += sp->st_size; 532 if (f_longform) { 533 if (f_numericonly || 534 (user = user_from_uid(sp->st_uid, 0)) == 535 NULL) { 536 (void)snprintf(nuser, sizeof(nuser), 537 "%u", sp->st_uid); 538 user = nuser; 539 } 540 if (f_numericonly || 541 (group = group_from_gid(sp->st_gid, 0)) == 542 NULL) { 543 (void)snprintf(ngroup, sizeof(ngroup), 544 "%u", sp->st_gid); 545 group = ngroup; 546 } 547 if ((ulen = strlen(user)) > maxuser) 548 maxuser = ulen; 549 if ((glen = strlen(group)) > maxgroup) 550 maxgroup = glen; 551 if (f_flags) { 552 flags = 553 flags_to_string(sp->st_flags, "-"); 554 if ((flen = strlen(flags)) > maxflags) 555 maxflags = flen; 556 } else 557 flen = 0; 558 559 if ((np = malloc(sizeof(NAMES) + 560 ulen + glen + flen + 3)) == NULL) 561 err(EXIT_FAILURE, NULL); 562 563 np->user = &np->data[0]; 564 (void)strcpy(np->user, user); 565 np->group = &np->data[ulen + 1]; 566 (void)strcpy(np->group, group); 567 568 if (f_flags) { 569 np->flags = &np->data[ulen + glen + 2]; 570 (void)strcpy(np->flags, flags); 571 } 572 cur->fts_pointer = np; 573 } 574 } 575 ++entries; 576 } 577 578 if (!entries) 579 return; 580 581 d.list = list; 582 d.entries = entries; 583 d.maxlen = maxlen; 584 if (needstats) { 585 d.btotal = btotal; 586 d.stotal = stotal; 587 if (!f_humanize) { 588 (void)snprintf(buf, sizeof(buf), "%llu", 589 (long long)howmany(maxblock, blocksize)); 590 d.s_block = strlen(buf); 591 } 592 d.s_flags = maxflags; 593 d.s_group = maxgroup; 594 (void)snprintf(buf, sizeof(buf), "%u", maxinode); 595 d.s_inode = strlen(buf); 596 (void)snprintf(buf, sizeof(buf), "%u", maxnlink); 597 d.s_nlink = strlen(buf); 598 if (f_humanize) { 599 d.s_size = 4; /* min buf length for humanize_number */ 600 } else { 601 (void)snprintf(buf, sizeof(buf), "%llu", 602 (long long)maxsize); 603 d.s_size = strlen(buf); 604 } 605 d.s_user = maxuser; 606 if (bcfile) { 607 (void)snprintf(buf, sizeof(buf), "%u", maxmajor); 608 d.s_major = strlen(buf); 609 (void)snprintf(buf, sizeof(buf), "%u", maxminor); 610 d.s_minor = strlen(buf); 611 if (d.s_major + d.s_minor + 2 > d.s_size) 612 d.s_size = d.s_major + d.s_minor + 2; 613 else if (d.s_size - d.s_minor - 2 > d.s_major) 614 d.s_major = d.s_size - d.s_minor - 2; 615 } else { 616 d.s_major = 0; 617 d.s_minor = 0; 618 } 619 } 620 621 printfcn(&d); 622 output = 1; 623 624 if (f_longform) 625 for (cur = list; cur; cur = cur->fts_link) 626 free(cur->fts_pointer); 627} 628 629/* 630 * Ordering for mastercmp: 631 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 632 * as larger than directories. Within either group, use the sort function. 633 * All other levels use the sort function. Error entries remain unsorted. 634 */ 635static int 636mastercmp(const FTSENT **a, const FTSENT **b) 637{ 638 int a_info, b_info; 639 640 a_info = (*a)->fts_info; 641 if (a_info == FTS_ERR) 642 return (0); 643 b_info = (*b)->fts_info; 644 if (b_info == FTS_ERR) 645 return (0); 646 647 if (a_info == FTS_NS || b_info == FTS_NS) { 648 if (b_info != FTS_NS) 649 return (1); 650 else if (a_info != FTS_NS) 651 return (-1); 652 else 653 return (namecmp(*a, *b)); 654 } 655 656 if (a_info != b_info && !f_listdir && 657 (*a)->fts_level == FTS_ROOTLEVEL) { 658 if (a_info == FTS_D) 659 return (1); 660 else if (b_info == FTS_D) 661 return (-1); 662 } 663 return (sortfcn(*a, *b)); 664} 665