ls.c revision 1.52
1/* $NetBSD: ls.c,v 1.52 2003/09/22 02:43:20 jschauma 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 1.52 2003/09/22 02:43:20 jschauma 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_inode; /* print inode */ 92int f_listdir; /* list actual directory, not contents */ 93int f_listdot; /* list files beginning with . */ 94int f_longform; /* long listing format */ 95int f_nonprint; /* show unprintables as ? */ 96int f_nosort; /* don't sort output */ 97int f_numericonly; /* don't convert uid/gid to name */ 98int f_octal; /* print octal escapes for nongraphic characters */ 99int f_octal_escape; /* like f_octal but use C escapes if possible */ 100int f_recursive; /* ls subdirectories also */ 101int f_reversesort; /* reverse whatever sort is used */ 102int f_sectime; /* print the real time for all files */ 103int f_singlecol; /* use single column output */ 104int f_size; /* list size in short listing */ 105int f_statustime; /* use time of last mode change */ 106int f_stream; /* stream format */ 107int f_type; /* add type character for non-regular files */ 108int f_typedir; /* add type character for directories */ 109int f_whiteout; /* show whiteout entries */ 110 111int 112ls_main(int argc, char *argv[]) 113{ 114 static char dot[] = ".", *dotav[] = { dot, NULL }; 115 struct winsize win; 116 int ch, fts_options; 117 int kflag = 0; 118 const char *p; 119 120 setlocale(LC_ALL, ""); 121 122 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 123 if (isatty(STDOUT_FILENO)) { 124 if ((p = getenv("COLUMNS")) != NULL) 125 termwidth = atoi(p); 126 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 127 win.ws_col > 0) 128 termwidth = win.ws_col; 129 f_column = f_nonprint = 1; 130 } else 131 f_singlecol = 1; 132 133 /* Root is -A automatically. */ 134 if (!getuid()) 135 f_listdot = 1; 136 137 fts_options = FTS_PHYSICAL; 138 while ((ch = getopt(argc, argv, "1ABCFLRSTWabcdfgiklmnopqrstuwx")) != -1) { 139 switch (ch) { 140 /* 141 * The -1, -C, -l, -m and -x options all override each other so 142 * shell aliasing works correctly. 143 */ 144 case '1': 145 f_singlecol = 1; 146 f_column = f_columnacross = f_longform = f_stream = 0; 147 break; 148 case 'C': 149 f_column = 1; 150 f_columnacross = f_longform = f_singlecol = f_stream = 151 0; 152 break; 153 case 'g': 154 if (f_grouponly != -1) 155 f_grouponly = 1; 156 f_longform = 1; 157 f_column = f_columnacross = f_singlecol = f_stream = 0; 158 break; 159 case 'l': 160 f_longform = 1; 161 f_column = f_columnacross = f_singlecol = f_stream = 0; 162 /* Never let -g take precedence over -l. */ 163 f_grouponly = -1; 164 break; 165 case 'm': 166 f_stream = 1; 167 f_column = f_columnacross = f_longform = f_singlecol = 168 0; 169 break; 170 case 'x': 171 f_columnacross = 1; 172 f_column = f_longform = f_singlecol = f_stream = 0; 173 break; 174 /* The -c and -u options override each other. */ 175 case 'c': 176 f_statustime = 1; 177 f_accesstime = 0; 178 break; 179 case 'u': 180 f_accesstime = 1; 181 f_statustime = 0; 182 break; 183 case 'F': 184 f_type = 1; 185 break; 186 case 'L': 187 fts_options &= ~FTS_PHYSICAL; 188 fts_options |= FTS_LOGICAL; 189 break; 190 case 'R': 191 f_recursive = 1; 192 break; 193 case 'a': 194 fts_options |= FTS_SEEDOT; 195 /* FALLTHROUGH */ 196 case 'A': 197 f_listdot = 1; 198 break; 199 /* the -B option turns off the -b, -q and -w options. */ 200 case 'B': 201 f_nonprint = 0; 202 f_octal = 1; 203 f_octal_escape = 0; 204 break; 205 /* the -b option turns off the -B, -q and -w options. */ 206 case 'b': 207 f_nonprint = 0; 208 f_octal = 0; 209 f_octal_escape = 1; 210 break; 211 /* The -d option turns off the -R option. */ 212 case 'd': 213 f_listdir = 1; 214 f_recursive = 0; 215 break; 216 case 'f': 217 f_nosort = 1; 218 break; 219 case 'i': 220 f_inode = 1; 221 break; 222 case 'k': 223 blocksize = 1024; 224 kflag = 1; 225 break; 226 case 'n': 227 f_numericonly = 1; 228 break; 229 case 'o': 230 f_flags = 1; 231 break; 232 case 'p': 233 f_typedir = 1; 234 break; 235 /* the -q option turns off the -B, -b and -w options. */ 236 case 'q': 237 f_nonprint = 1; 238 f_octal = 0; 239 f_octal_escape = 0; 240 break; 241 case 'r': 242 f_reversesort = 1; 243 break; 244 case 'S': 245 sortkey = BY_SIZE; 246 break; 247 case 's': 248 f_size = 1; 249 break; 250 case 'T': 251 f_sectime = 1; 252 break; 253 case 't': 254 sortkey = BY_TIME; 255 break; 256 case 'W': 257 f_whiteout = 1; 258 break; 259 /* the -w option turns off the -B, -b and -q options. */ 260 case 'w': 261 f_nonprint = 0; 262 f_octal = 0; 263 f_octal_escape = 0; 264 break; 265 default: 266 case '?': 267 usage(); 268 } 269 } 270 argc -= optind; 271 argv += optind; 272 273 /* 274 * If both -g and -l options, let -l take precedence. 275 */ 276 if (f_grouponly == -1) 277 f_grouponly = 0; 278 279 /* 280 * If not -F, -i, -l, -p, -S, -s or -t options, don't require stat 281 * information. 282 */ 283 if (!f_inode && !f_longform && !f_size && !f_type && !f_typedir && 284 sortkey == BY_NAME) 285 fts_options |= FTS_NOSTAT; 286 287 /* 288 * If not -F, -d or -l options, follow any symbolic links listed on 289 * the command line. 290 */ 291 if (!f_longform && !f_listdir && !f_type) 292 fts_options |= FTS_COMFOLLOW; 293 294 /* 295 * If -W, show whiteout entries 296 */ 297#ifdef FTS_WHITEOUT 298 if (f_whiteout) 299 fts_options |= FTS_WHITEOUT; 300#endif 301 302 /* If -l or -s, figure out block size. */ 303 if (f_inode || f_longform || f_size) { 304 if (!kflag) 305 (void)getbsize(NULL, &blocksize); 306 blocksize /= 512; 307 } 308 309 /* Select a sort function. */ 310 if (f_reversesort) { 311 switch (sortkey) { 312 case BY_NAME: 313 sortfcn = revnamecmp; 314 break; 315 case BY_SIZE: 316 sortfcn = revsizecmp; 317 break; 318 case BY_TIME: 319 if (f_accesstime) 320 sortfcn = revacccmp; 321 else if (f_statustime) 322 sortfcn = revstatcmp; 323 else /* Use modification time. */ 324 sortfcn = revmodcmp; 325 break; 326 } 327 } else { 328 switch (sortkey) { 329 case BY_NAME: 330 sortfcn = namecmp; 331 break; 332 case BY_SIZE: 333 sortfcn = sizecmp; 334 break; 335 case BY_TIME: 336 if (f_accesstime) 337 sortfcn = acccmp; 338 else if (f_statustime) 339 sortfcn = statcmp; 340 else /* Use modification time. */ 341 sortfcn = modcmp; 342 break; 343 } 344 } 345 346 /* Select a print function. */ 347 if (f_singlecol) 348 printfcn = printscol; 349 else if (f_columnacross) 350 printfcn = printacol; 351 else if (f_longform) 352 printfcn = printlong; 353 else if (f_stream) 354 printfcn = printstream; 355 else 356 printfcn = printcol; 357 358 if (argc) 359 traverse(argc, argv, fts_options); 360 else 361 traverse(1, dotav, fts_options); 362 exit(rval); 363 /* NOTREACHED */ 364} 365 366static int output; /* If anything output. */ 367 368/* 369 * Traverse() walks the logical directory structure specified by the argv list 370 * in the order specified by the mastercmp() comparison function. During the 371 * traversal it passes linked lists of structures to display() which represent 372 * a superset (may be exact set) of the files to be displayed. 373 */ 374static void 375traverse(int argc, char *argv[], int options) 376{ 377 FTS *ftsp; 378 FTSENT *p, *chp; 379 int ch_options; 380 381 if ((ftsp = 382 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 383 err(EXIT_FAILURE, NULL); 384 385 display(NULL, fts_children(ftsp, 0)); 386 if (f_listdir) 387 return; 388 389 /* 390 * If not recursing down this tree and don't need stat info, just get 391 * the names. 392 */ 393 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 394 395 while ((p = fts_read(ftsp)) != NULL) 396 switch (p->fts_info) { 397 case FTS_DC: 398 warnx("%s: directory causes a cycle", p->fts_name); 399 break; 400 case FTS_DNR: 401 case FTS_ERR: 402 warnx("%s: %s", p->fts_name, strerror(p->fts_errno)); 403 rval = EXIT_FAILURE; 404 break; 405 case FTS_D: 406 if (p->fts_level != FTS_ROOTLEVEL && 407 p->fts_name[0] == '.' && !f_listdot) 408 break; 409 410 /* 411 * If already output something, put out a newline as 412 * a separator. If multiple arguments, precede each 413 * directory with its name. 414 */ 415 if (output) 416 (void)printf("\n%s:\n", p->fts_path); 417 else if (argc > 1) { 418 (void)printf("%s:\n", p->fts_path); 419 output = 1; 420 } 421 422 chp = fts_children(ftsp, ch_options); 423 display(p, chp); 424 425 if (!f_recursive && chp != NULL) 426 (void)fts_set(ftsp, p, FTS_SKIP); 427 break; 428 } 429 if (errno) 430 err(EXIT_FAILURE, "fts_read"); 431} 432 433/* 434 * Display() takes a linked list of FTSENT structures and passes the list 435 * along with any other necessary information to the print function. P 436 * points to the parent directory of the display list. 437 */ 438static void 439display(FTSENT *p, FTSENT *list) 440{ 441 struct stat *sp; 442 DISPLAY d; 443 FTSENT *cur; 444 NAMES *np; 445 u_int64_t btotal, maxblock, maxsize; 446 int maxinode, maxnlink, maxmajor, maxminor; 447 int bcfile, entries, flen, glen, ulen, maxflags, maxgroup, maxlen; 448 int maxuser, needstats; 449 const char *user, *group; 450 char buf[21]; /* 64 bits == 20 digits, +1 for NUL */ 451 char nuser[12], ngroup[12]; 452 char *flags = NULL; 453 454#ifdef __GNUC__ 455 /* This outrageous construct just to shut up a GCC warning. */ 456 (void) &maxsize; 457#endif 458 459 /* 460 * If list is NULL there are two possibilities: that the parent 461 * directory p has no children, or that fts_children() returned an 462 * error. We ignore the error case since it will be replicated 463 * on the next call to fts_read() on the post-order visit to the 464 * directory p, and will be signalled in traverse(). 465 */ 466 if (list == NULL) 467 return; 468 469 needstats = f_inode || f_longform || f_size; 470 flen = 0; 471 maxinode = maxnlink = 0; 472 bcfile = 0; 473 maxuser = maxgroup = maxflags = maxlen = 0; 474 btotal = maxblock = maxsize = 0; 475 maxmajor = maxminor = 0; 476 for (cur = list, entries = 0; cur; cur = cur->fts_link) { 477 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 478 warnx("%s: %s", 479 cur->fts_name, strerror(cur->fts_errno)); 480 cur->fts_number = NO_PRINT; 481 rval = EXIT_FAILURE; 482 continue; 483 } 484 485 /* 486 * P is NULL if list is the argv list, to which different rules 487 * apply. 488 */ 489 if (p == NULL) { 490 /* Directories will be displayed later. */ 491 if (cur->fts_info == FTS_D && !f_listdir) { 492 cur->fts_number = NO_PRINT; 493 continue; 494 } 495 } else { 496 /* Only display dot file if -a/-A set. */ 497 if (cur->fts_name[0] == '.' && !f_listdot) { 498 cur->fts_number = NO_PRINT; 499 continue; 500 } 501 } 502 if (cur->fts_namelen > maxlen) 503 maxlen = cur->fts_namelen; 504 if (needstats) { 505 sp = cur->fts_statp; 506 if (sp->st_blocks > maxblock) 507 maxblock = sp->st_blocks; 508 if (sp->st_ino > maxinode) 509 maxinode = sp->st_ino; 510 if (sp->st_nlink > maxnlink) 511 maxnlink = sp->st_nlink; 512 if (sp->st_size > maxsize) 513 maxsize = sp->st_size; 514 if (S_ISCHR(sp->st_mode) || S_ISBLK(sp->st_mode)) { 515 bcfile = 1; 516 if (major(sp->st_rdev) > maxmajor) 517 maxmajor = major(sp->st_rdev); 518 if (minor(sp->st_rdev) > maxminor) 519 maxminor = minor(sp->st_rdev); 520 } 521 522 btotal += sp->st_blocks; 523 if (f_longform) { 524 if (f_numericonly || 525 (user = user_from_uid(sp->st_uid, 0)) == 526 NULL) { 527 (void)snprintf(nuser, sizeof(nuser), 528 "%u", sp->st_uid); 529 user = nuser; 530 } 531 if (f_numericonly || 532 (group = group_from_gid(sp->st_gid, 0)) == 533 NULL) { 534 (void)snprintf(ngroup, sizeof(ngroup), 535 "%u", sp->st_gid); 536 group = ngroup; 537 } 538 if ((ulen = strlen(user)) > maxuser) 539 maxuser = ulen; 540 if ((glen = strlen(group)) > maxgroup) 541 maxgroup = glen; 542 if (f_flags) { 543 flags = 544 flags_to_string(sp->st_flags, "-"); 545 if ((flen = strlen(flags)) > maxflags) 546 maxflags = flen; 547 } else 548 flen = 0; 549 550 if ((np = malloc(sizeof(NAMES) + 551 ulen + glen + flen + 3)) == NULL) 552 err(EXIT_FAILURE, NULL); 553 554 np->user = &np->data[0]; 555 (void)strcpy(np->user, user); 556 np->group = &np->data[ulen + 1]; 557 (void)strcpy(np->group, group); 558 559 if (f_flags) { 560 np->flags = &np->data[ulen + glen + 2]; 561 (void)strcpy(np->flags, flags); 562 } 563 cur->fts_pointer = np; 564 } 565 } 566 ++entries; 567 } 568 569 if (!entries) 570 return; 571 572 d.list = list; 573 d.entries = entries; 574 d.maxlen = maxlen; 575 if (needstats) { 576 d.btotal = btotal; 577 (void)snprintf(buf, sizeof(buf), "%llu", 578 (long long)howmany(maxblock, blocksize)); 579 d.s_block = strlen(buf); 580 d.s_flags = maxflags; 581 d.s_group = maxgroup; 582 (void)snprintf(buf, sizeof(buf), "%u", maxinode); 583 d.s_inode = strlen(buf); 584 (void)snprintf(buf, sizeof(buf), "%u", maxnlink); 585 d.s_nlink = strlen(buf); 586 (void)snprintf(buf, sizeof(buf), "%llu", (long long)maxsize); 587 d.s_size = strlen(buf); 588 d.s_user = maxuser; 589 if (bcfile) { 590 (void)snprintf(buf, sizeof(buf), "%u", maxmajor); 591 d.s_major = strlen(buf); 592 (void)snprintf(buf, sizeof(buf), "%u", maxminor); 593 d.s_minor = strlen(buf); 594 if (d.s_major + d.s_minor + 2 > d.s_size) 595 d.s_size = d.s_major + d.s_minor + 2; 596 else if (d.s_size - d.s_minor - 2 > d.s_major) 597 d.s_major = d.s_size - d.s_minor - 2; 598 } else { 599 d.s_major = 0; 600 d.s_minor = 0; 601 } 602 } 603 604 printfcn(&d); 605 output = 1; 606 607 if (f_longform) 608 for (cur = list; cur; cur = cur->fts_link) 609 free(cur->fts_pointer); 610} 611 612/* 613 * Ordering for mastercmp: 614 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 615 * as larger than directories. Within either group, use the sort function. 616 * All other levels use the sort function. Error entries remain unsorted. 617 */ 618static int 619mastercmp(const FTSENT **a, const FTSENT **b) 620{ 621 int a_info, b_info; 622 623 a_info = (*a)->fts_info; 624 if (a_info == FTS_ERR) 625 return (0); 626 b_info = (*b)->fts_info; 627 if (b_info == FTS_ERR) 628 return (0); 629 630 if (a_info == FTS_NS || b_info == FTS_NS) { 631 if (b_info != FTS_NS) 632 return (1); 633 else if (a_info != FTS_NS) 634 return (-1); 635 else 636 return (namecmp(*a, *b)); 637 } 638 639 if (a_info != b_info && !f_listdir && 640 (*a)->fts_level == FTS_ROOTLEVEL) { 641 if (a_info == FTS_D) 642 return (1); 643 else if (b_info == FTS_D) 644 return (-1); 645 } 646 return (sortfcn(*a, *b)); 647} 648