ls.c revision 61295
1/* 2 * Copyright (c) 1989, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Michael Fischbein. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37#ifndef lint 38static const char copyright[] = 39"@(#) Copyright (c) 1989, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41#endif /* not lint */ 42 43#ifndef lint 44#if 0 45static char sccsid[] = "@(#)ls.c 8.5 (Berkeley) 4/2/94"; 46#else 47static const char rcsid[] = 48 "$FreeBSD: head/bin/ls/ls.c 61295 2000-06-05 20:38:47Z cracauer $"; 49#endif 50#endif /* not lint */ 51 52#include <sys/types.h> 53#include <sys/stat.h> 54#include <sys/ioctl.h> 55 56#include <dirent.h> 57#include <err.h> 58#include <errno.h> 59#include <fts.h> 60#include <limits.h> 61#include <locale.h> 62#include <stdio.h> 63#include <stdlib.h> 64#include <string.h> 65#include <unistd.h> 66#ifdef COLORLS 67#include <termcap.h> 68#include <signal.h> 69#endif 70 71#include "ls.h" 72#include "extern.h" 73 74/* 75 * Upward approximation of the maximum number of characters needed to 76 * represent a value of integral type t as a string, excluding the 77 * NUL terminator, with provision for a sign. 78 */ 79#define STRBUF_SIZEOF(t) (1 + CHAR_BIT * sizeof(t) / 3 + 1) 80 81char *getflags __P((u_long, char *)); 82 83static void display __P((FTSENT *, FTSENT *)); 84static u_quad_t makenines __P((u_long)); 85static int mastercmp __P((const FTSENT **, const FTSENT **)); 86static void traverse __P((int, char **, int)); 87 88static void (*printfcn) __P((DISPLAY *)); 89static int (*sortfcn) __P((const FTSENT *, const FTSENT *)); 90 91long blocksize; /* block size units */ 92int termwidth = 80; /* default terminal width */ 93 94/* flags */ 95int f_accesstime; /* use time of last access */ 96int f_column; /* columnated format */ 97int f_flags; /* show flags associated with a file */ 98int f_inode; /* print inode */ 99int f_kblocks; /* print size in kilobytes */ 100int f_listdir; /* list actual directory, not contents */ 101int f_listdot; /* list files beginning with . */ 102int f_longform; /* long listing format */ 103int f_nonprint; /* show unprintables as ? */ 104int f_nosort; /* don't sort output */ 105int f_notabs; /* don't use tab-separated multi-col output */ 106int f_numericonly; /* don't convert uid/gid to name */ 107int f_octal; /* show unprintables as \xxx */ 108int f_octal_escape; /* like f_octal but use C escapes if possible */ 109int f_recursive; /* ls subdirectories also */ 110int f_reversesort; /* reverse whatever sort is used */ 111int f_sectime; /* print the real time for all files */ 112int f_singlecol; /* use single column output */ 113int f_size; /* list size in short listing */ 114int f_statustime; /* use time of last mode change */ 115int f_timesort; /* sort by time vice name */ 116int f_type; /* add type character for non-regular files */ 117int f_whiteout; /* show whiteout entries */ 118#ifdef COLORLS 119int f_color; /* add type in color for non-regular files */ 120 121char *ansi_bgcol; /* ANSI sequence to set background colour */ 122char *ansi_fgcol; /* ANSI sequence to set foreground colour */ 123char *ansi_coloff; /* ANSI sequence to reset colours */ 124extern void colorquit __P((int)); 125#endif 126 127int rval; 128 129int 130main(argc, argv) 131 int argc; 132 char *argv[]; 133{ 134 static char dot[] = ".", *dotav[] = { dot, NULL }; 135 struct winsize win; 136 int ch, fts_options, notused; 137 char *p; 138 139#ifdef COLORLS 140 char termcapbuf[1024]; /* termcap definition buffer */ 141 char tcapbuf[512]; /* capability buffer */ 142 char *bp = tcapbuf; 143#endif 144 145 (void) setlocale(LC_ALL, ""); 146 147 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 148 if (isatty(STDOUT_FILENO)) { 149 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1 || 150 !win.ws_col) { 151 if ((p = getenv("COLUMNS")) != NULL) 152 termwidth = atoi(p); 153 } 154 else 155 termwidth = win.ws_col; 156 f_column = f_nonprint = 1; 157 } else { 158 f_singlecol = 1; 159 /* retrieve environment variable, in case of explicit -C */ 160 if ((p = getenv("COLUMNS"))) 161 termwidth = atoi(p); 162 } 163 164 /* Root is -A automatically. */ 165 if (!getuid()) 166 f_listdot = 1; 167 168 fts_options = FTS_PHYSICAL; 169 while ((ch = getopt(argc, argv, "1ABCFGHLPRTWabcdfgiklnoqrstu")) != -1) { 170 switch (ch) { 171 /* 172 * The -1, -C and -l options all override each other so shell 173 * aliasing works right. 174 */ 175 case '1': 176 f_singlecol = 1; 177 f_column = f_longform = 0; 178 break; 179 case 'B': 180 f_nonprint = 0; 181 f_octal = 1; 182 f_octal_escape = 0; 183 break; 184 case 'C': 185 f_column = 1; 186 f_longform = f_singlecol = 0; 187 break; 188 case 'l': 189 f_longform = 1; 190 f_column = f_singlecol = 0; 191 break; 192 /* The -c and -u options override each other. */ 193 case 'c': 194 f_statustime = 1; 195 f_accesstime = 0; 196 break; 197 case 'u': 198 f_accesstime = 1; 199 f_statustime = 0; 200 break; 201 case 'F': 202 f_type = 1; 203 break; 204 case 'H': 205 fts_options |= FTS_COMFOLLOW; 206 break; 207 case 'G': 208 if (isatty(STDOUT_FILENO)) 209#ifdef COLORLS 210 if (tgetent(termcapbuf, getenv("TERM")) == 1) { 211 ansi_fgcol = tgetstr("AF", &bp); 212 ansi_bgcol = tgetstr("AB", &bp); 213 214 /* To switch colours off use 'op' if 215 * available, otherwise use 'oc', or 216 * don't do colours at all. */ 217 ansi_coloff = tgetstr("op", &bp); 218 if (!ansi_coloff) 219 ansi_coloff = tgetstr("oc", &bp); 220 if (ansi_fgcol && ansi_bgcol && ansi_coloff) 221 f_color = 1; 222 } 223#else 224 (void)fprintf(stderr, "Color support not compiled in.\n"); 225#endif 226 break; 227 case 'L': 228 fts_options &= ~FTS_PHYSICAL; 229 fts_options |= FTS_LOGICAL; 230 break; 231 case 'P': 232 fts_options &= ~FTS_COMFOLLOW; 233 fts_options &= ~FTS_LOGICAL; 234 fts_options |= FTS_PHYSICAL; 235 break; 236 case 'R': 237 f_recursive = 1; 238 break; 239 case 'a': 240 fts_options |= FTS_SEEDOT; 241 /* FALLTHROUGH */ 242 case 'A': 243 f_listdot = 1; 244 break; 245 /* The -d option turns off the -R option. */ 246 case 'd': 247 f_listdir = 1; 248 f_recursive = 0; 249 break; 250 case 'f': 251 f_nosort = 1; 252 break; 253 case 'g': /* Compatibility with 4.3BSD. */ 254 break; 255 case 'i': 256 f_inode = 1; 257 break; 258 case 'k': 259 f_kblocks = 1; 260 break; 261 case 'n': 262 f_numericonly = 1; 263 break; 264 case 'o': 265 f_flags = 1; 266 break; 267 case 'q': 268 f_nonprint = 1; 269 f_octal = 0; 270 f_octal_escape = 0; 271 break; 272 case 'r': 273 f_reversesort = 1; 274 break; 275 case 's': 276 f_size = 1; 277 break; 278 case 'T': 279 f_sectime = 1; 280 break; 281 case 't': 282 f_timesort = 1; 283 break; 284 case 'W': 285 f_whiteout = 1; 286 break; 287 case 'b': 288 f_nonprint = 0; 289 f_octal = 0; 290 f_octal_escape = 1; 291 break; 292 default: 293 case '?': 294 usage(); 295 } 296 } 297 argc -= optind; 298 argv += optind; 299 300#ifdef COLORLS 301 if (f_color) { 302 (void) signal(SIGINT, colorquit); 303 (void) signal(SIGQUIT, colorquit); 304 parsecolors(getenv("LSCOLORS")); 305 } 306#endif 307 308 /* 309 * If not -F, -i, -l, -s or -t options, don't require stat 310 * information, unless in color mode in which case we do 311 * need this to determine which colors to display. 312 */ 313 if (!f_inode && !f_longform && !f_size && !f_timesort && !f_type 314#ifdef COLORLS 315 && !f_color 316#endif 317 ) 318 fts_options |= FTS_NOSTAT; 319 320 /* 321 * If not -F, -d or -l options, follow any symbolic links listed on 322 * the command line. 323 */ 324 if (!f_longform && !f_listdir && !f_type) 325 fts_options |= FTS_COMFOLLOW; 326 327 /* 328 * If -W, show whiteout entries 329 */ 330#ifdef FTS_WHITEOUT 331 if (f_whiteout) 332 fts_options |= FTS_WHITEOUT; 333#endif 334 335 /* If -l or -s, figure out block size. */ 336 if (f_longform || f_size) { 337 if (f_kblocks) 338 blocksize = 2; 339 else { 340 (void)getbsize(¬used, &blocksize); 341 blocksize /= 512; 342 } 343 } 344 345 /* Select a sort function. */ 346 if (f_reversesort) { 347 if (!f_timesort) 348 sortfcn = revnamecmp; 349 else if (f_accesstime) 350 sortfcn = revacccmp; 351 else if (f_statustime) 352 sortfcn = revstatcmp; 353 else /* Use modification time. */ 354 sortfcn = revmodcmp; 355 } else { 356 if (!f_timesort) 357 sortfcn = namecmp; 358 else if (f_accesstime) 359 sortfcn = acccmp; 360 else if (f_statustime) 361 sortfcn = statcmp; 362 else /* Use modification time. */ 363 sortfcn = modcmp; 364 } 365 366 /* Select a print function. */ 367 if (f_singlecol) 368 printfcn = printscol; 369 else if (f_longform) 370 printfcn = printlong; 371 else 372 printfcn = printcol; 373 374 if (argc) 375 traverse(argc, argv, fts_options); 376 else 377 traverse(1, dotav, fts_options); 378 exit(rval); 379} 380 381static int output; /* If anything output. */ 382 383/* 384 * Traverse() walks the logical directory structure specified by the argv list 385 * in the order specified by the mastercmp() comparison function. During the 386 * traversal it passes linked lists of structures to display() which represent 387 * a superset (may be exact set) of the files to be displayed. 388 */ 389static void 390traverse(argc, argv, options) 391 int argc, options; 392 char *argv[]; 393{ 394 FTS *ftsp; 395 FTSENT *p, *chp; 396 int ch_options; 397 398 if ((ftsp = 399 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 400 err(1, NULL); 401 402 display(NULL, fts_children(ftsp, 0)); 403 if (f_listdir) 404 return; 405 406 /* 407 * If not recursing down this tree and don't need stat info, just get 408 * the names. 409 */ 410 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 411 412 while ((p = fts_read(ftsp)) != NULL) 413 switch (p->fts_info) { 414 case FTS_DC: 415 warnx("%s: directory causes a cycle", p->fts_name); 416 break; 417 case FTS_DNR: 418 case FTS_ERR: 419 warnx("%s: %s", p->fts_name, strerror(p->fts_errno)); 420 rval = 1; 421 break; 422 case FTS_D: 423 if (p->fts_level != FTS_ROOTLEVEL && 424 p->fts_name[0] == '.' && !f_listdot) 425 break; 426 427 /* 428 * If already output something, put out a newline as 429 * a separator. If multiple arguments, precede each 430 * directory with its name. 431 */ 432 if (output) 433 (void)printf("\n%s:\n", p->fts_path); 434 else if (argc > 1) { 435 (void)printf("%s:\n", p->fts_path); 436 output = 1; 437 } 438 439 chp = fts_children(ftsp, ch_options); 440 display(p, chp); 441 442 if (!f_recursive && chp != NULL) 443 (void)fts_set(ftsp, p, FTS_SKIP); 444 break; 445 } 446 if (errno) 447 err(1, "fts_read"); 448} 449 450/* 451 * Display() takes a linked list of FTSENT structures and passes the list 452 * along with any other necessary information to the print function. P 453 * points to the parent directory of the display list. 454 */ 455static void 456display(p, list) 457 FTSENT *p, *list; 458{ 459 struct stat *sp; 460 DISPLAY d; 461 FTSENT *cur; 462 NAMES *np; 463 u_quad_t maxsize; 464 u_long btotal, maxblock, maxinode, maxlen, maxnlink; 465 int bcfile, flen, glen, ulen, maxflags, maxgroup, maxuser; 466 char *initmax; 467 int entries, needstats; 468 char *user, *group, *flags; 469 char buf[STRBUF_SIZEOF(u_quad_t) + 1]; 470 char ngroup[STRBUF_SIZEOF(uid_t) + 1]; 471 char nuser[STRBUF_SIZEOF(gid_t) + 1]; 472 473 /* 474 * If list is NULL there are two possibilities: that the parent 475 * directory p has no children, or that fts_children() returned an 476 * error. We ignore the error case since it will be replicated 477 * on the next call to fts_read() on the post-order visit to the 478 * directory p, and will be signaled in traverse(). 479 */ 480 if (list == NULL) 481 return; 482 483 needstats = f_inode || f_longform || f_size; 484 flen = 0; 485 btotal = 0; 486 initmax = getenv("LS_COLWIDTHS"); 487 /* Fields match -lios order. New ones should be added at the end. */ 488 if (initmax != NULL && *initmax != '\0') { 489 char *initmax2, *jinitmax; 490 int ninitmax; 491 492 /* Fill-in "::" as "0:0:0" for the sake of scanf. */ 493 jinitmax = initmax2 = malloc(strlen(initmax) * 2 + 2); 494 if (jinitmax == NULL) 495 err(1, NULL); 496 if (*initmax == ':') 497 strcpy(initmax2, "0:"), initmax2 += 2; 498 else 499 *initmax2++ = *initmax, *initmax2 = '\0'; 500 for (initmax++; *initmax != '\0'; initmax++) { 501 if (initmax[-1] == ':' && initmax[0] == ':') { 502 *initmax2++ = '0'; 503 *initmax2++ = initmax[0]; 504 initmax2[1] = '\0'; 505 } else { 506 *initmax2++ = initmax[0]; 507 initmax2[1] = '\0'; 508 } 509 } 510 if (initmax2[-1] == ':') strcpy(initmax2, "0"); 511 512 ninitmax = sscanf(jinitmax, 513 " %lu : %lu : %lu : %i : %i : %i : %qu : %lu ", 514 &maxinode, &maxblock, &maxnlink, &maxuser, 515 &maxgroup, &maxflags, &maxsize, &maxlen); 516 f_notabs = 1; 517 switch (ninitmax) { 518 case 0: maxinode = 0; 519 case 1: maxblock = 0; 520 case 2: maxnlink = 0; 521 case 3: maxuser = 0; 522 case 4: maxgroup = 0; 523 case 5: maxflags = 0; 524 case 6: maxsize = 0; 525 case 7: maxlen = 0, f_notabs = 0; 526 } 527 maxinode = makenines(maxinode); 528 maxblock = makenines(maxblock); 529 maxnlink = makenines(maxnlink); 530 maxsize = makenines(maxsize); 531 } else if (initmax == NULL || *initmax == '\0') 532 maxblock = maxinode = maxlen = maxnlink = 533 maxuser = maxgroup = maxflags = maxsize = 0; 534 bcfile = 0; 535 flags = NULL; 536 for (cur = list, entries = 0; cur; cur = cur->fts_link) { 537 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 538 warnx("%s: %s", 539 cur->fts_name, strerror(cur->fts_errno)); 540 cur->fts_number = NO_PRINT; 541 rval = 1; 542 continue; 543 } 544 545 /* 546 * P is NULL if list is the argv list, to which different rules 547 * apply. 548 */ 549 if (p == NULL) { 550 /* Directories will be displayed later. */ 551 if (cur->fts_info == FTS_D && !f_listdir) { 552 cur->fts_number = NO_PRINT; 553 continue; 554 } 555 } else { 556 /* Only display dot file if -a/-A set. */ 557 if (cur->fts_name[0] == '.' && !f_listdot) { 558 cur->fts_number = NO_PRINT; 559 continue; 560 } 561 } 562 if (f_nonprint) 563 prcopy(cur->fts_name, cur->fts_name, cur->fts_namelen); 564 if (cur->fts_namelen > maxlen) 565 maxlen = cur->fts_namelen; 566 if (f_octal || f_octal_escape) { 567 int t = len_octal(cur->fts_name, cur->fts_namelen); 568 if (t > maxlen) maxlen = t; 569 } 570 if (needstats) { 571 sp = cur->fts_statp; 572 if (sp->st_blocks > maxblock) 573 maxblock = sp->st_blocks; 574 if (sp->st_ino > maxinode) 575 maxinode = sp->st_ino; 576 if (sp->st_nlink > maxnlink) 577 maxnlink = sp->st_nlink; 578 if (sp->st_size > maxsize) 579 maxsize = sp->st_size; 580 581 btotal += sp->st_blocks; 582 if (f_longform) { 583 if (f_numericonly) { 584 (void)snprintf(nuser, sizeof(nuser), 585 "%u", sp->st_uid); 586 (void)snprintf(ngroup, sizeof(ngroup), 587 "%u", sp->st_gid); 588 user = nuser; 589 group = ngroup; 590 } else { 591 user = user_from_uid(sp->st_uid, 0); 592 group = group_from_gid(sp->st_gid, 0); 593 } 594 if ((ulen = strlen(user)) > maxuser) 595 maxuser = ulen; 596 if ((glen = strlen(group)) > maxgroup) 597 maxgroup = glen; 598 if (f_flags) { 599 flags = getflags(sp->st_flags, "-"); 600 if ((flen = strlen(flags)) > maxflags) 601 maxflags = flen; 602 } else 603 flen = 0; 604 605 if ((np = malloc(sizeof(NAMES) + 606 ulen + glen + flen + 3)) == NULL) 607 err(1, NULL); 608 609 np->user = &np->data[0]; 610 (void)strcpy(np->user, user); 611 np->group = &np->data[ulen + 1]; 612 (void)strcpy(np->group, group); 613 614 if (S_ISCHR(sp->st_mode) || 615 S_ISBLK(sp->st_mode)) 616 bcfile = 1; 617 618 if (f_flags) { 619 np->flags = &np->data[ulen + glen + 2]; 620 (void)strcpy(np->flags, flags); 621 } 622 cur->fts_pointer = np; 623 } 624 } 625 ++entries; 626 } 627 628 if (!entries) 629 return; 630 631 d.list = list; 632 d.entries = entries; 633 d.maxlen = maxlen; 634 if (needstats) { 635 d.bcfile = bcfile; 636 d.btotal = btotal; 637 (void)snprintf(buf, sizeof(buf), "%lu", maxblock); 638 d.s_block = strlen(buf); 639 d.s_flags = maxflags; 640 d.s_group = maxgroup; 641 (void)snprintf(buf, sizeof(buf), "%lu", maxinode); 642 d.s_inode = strlen(buf); 643 (void)snprintf(buf, sizeof(buf), "%lu", maxnlink); 644 d.s_nlink = strlen(buf); 645 (void)snprintf(buf, sizeof(buf), "%qu", maxsize); 646 d.s_size = strlen(buf); 647 d.s_user = maxuser; 648 } 649 650 printfcn(&d); 651 output = 1; 652 653 if (f_longform) 654 for (cur = list; cur; cur = cur->fts_link) 655 free(cur->fts_pointer); 656} 657 658/* 659 * Ordering for mastercmp: 660 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 661 * as larger than directories. Within either group, use the sort function. 662 * All other levels use the sort function. Error entries remain unsorted. 663 */ 664static int 665mastercmp(a, b) 666 const FTSENT **a, **b; 667{ 668 int a_info, b_info; 669 670 a_info = (*a)->fts_info; 671 if (a_info == FTS_ERR) 672 return (0); 673 b_info = (*b)->fts_info; 674 if (b_info == FTS_ERR) 675 return (0); 676 677 if (a_info == FTS_NS || b_info == FTS_NS) 678 return (namecmp(*a, *b)); 679 680 if (a_info != b_info && 681 (*a)->fts_level == FTS_ROOTLEVEL && !f_listdir) { 682 if (a_info == FTS_D) 683 return (1); 684 if (b_info == FTS_D) 685 return (-1); 686 } 687 return (sortfcn(*a, *b)); 688} 689 690/* 691 * Makenines() returns (10**n)-1. This is useful for converting a width 692 * into a number that wide in decimal. 693 */ 694static u_quad_t 695makenines(n) 696 u_long n; 697{ 698 u_long i; 699 u_quad_t reg; 700 701 reg = 1; 702 /* Use a loop instead of pow(), since all values of n are small. */ 703 for (i = 0; i < n; i++) 704 reg *= 10; 705 reg--; 706 707 return reg; 708} 709