ls.c revision 2889
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 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 44static char sccsid[] = "@(#)ls.c 8.5 (Berkeley) 4/2/94"; 45#endif /* not lint */ 46 47#include <sys/types.h> 48#include <sys/stat.h> 49#include <sys/ioctl.h> 50 51#include <dirent.h> 52#include <err.h> 53#include <errno.h> 54#include <fts.h> 55#include <stdio.h> 56#include <stdlib.h> 57#include <string.h> 58#include <unistd.h> 59 60#include "ls.h" 61#include "extern.h" 62 63static void display __P((FTSENT *, FTSENT *)); 64static int mastercmp __P((const FTSENT **, const FTSENT **)); 65static void traverse __P((int, char **, int)); 66 67static void (*printfcn) __P((DISPLAY *)); 68static int (*sortfcn) __P((const FTSENT *, const FTSENT *)); 69 70long blocksize; /* block size units */ 71int termwidth = 80; /* default terminal width */ 72 73/* flags */ 74int f_accesstime; /* use time of last access */ 75int f_column; /* columnated format */ 76int f_flags; /* show flags associated with a file */ 77int f_inode; /* print inode */ 78int f_kblocks; /* print size in kilobytes */ 79int f_listdir; /* list actual directory, not contents */ 80int f_listdot; /* list files beginning with . */ 81int f_longform; /* long listing format */ 82int f_newline; /* if precede with newline */ 83int f_nonprint; /* show unprintables as ? */ 84int f_nosort; /* don't sort output */ 85int f_recursive; /* ls subdirectories also */ 86int f_reversesort; /* reverse whatever sort is used */ 87int f_sectime; /* print the real time for all files */ 88int f_singlecol; /* use single column output */ 89int f_size; /* list size in short listing */ 90int f_statustime; /* use time of last mode change */ 91int f_dirname; /* if precede with directory name */ 92int f_timesort; /* sort by time vice name */ 93int f_type; /* add type character for non-regular files */ 94 95int 96main(argc, argv) 97 int argc; 98 char *argv[]; 99{ 100 static char dot[] = ".", *dotav[] = { dot, NULL }; 101 struct winsize win; 102 int ch, fts_options, notused; 103 char *p; 104 105 /* Terminal defaults to -Cq, non-terminal defaults to -1. */ 106 if (isatty(STDOUT_FILENO)) { 107 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == -1 || 108 !win.ws_col) { 109 if ((p = getenv("COLUMNS")) != NULL) 110 termwidth = atoi(p); 111 } 112 else 113 termwidth = win.ws_col; 114 f_column = f_nonprint = 1; 115 } else 116 f_singlecol = 1; 117 118 /* Root is -A automatically. */ 119 if (!getuid()) 120 f_listdot = 1; 121 122 fts_options = FTS_PHYSICAL; 123 while ((ch = getopt(argc, argv, "1ACFLRTacdfgikloqrstu")) != EOF) { 124 switch (ch) { 125 /* 126 * The -1, -C and -l options all override each other so shell 127 * aliasing works right. 128 */ 129 case '1': 130 f_singlecol = 1; 131 f_column = f_longform = 0; 132 break; 133 case 'C': 134 f_column = 1; 135 f_longform = f_singlecol = 0; 136 break; 137 case 'l': 138 f_longform = 1; 139 f_column = f_singlecol = 0; 140 break; 141 /* The -c and -u options override each other. */ 142 case 'c': 143 f_statustime = 1; 144 f_accesstime = 0; 145 break; 146 case 'u': 147 f_accesstime = 1; 148 f_statustime = 0; 149 break; 150 case 'F': 151 f_type = 1; 152 break; 153 case 'L': 154 fts_options &= ~FTS_PHYSICAL; 155 fts_options |= FTS_LOGICAL; 156 break; 157 case 'R': 158 f_recursive = 1; 159 break; 160 case 'a': 161 fts_options |= FTS_SEEDOT; 162 /* FALLTHROUGH */ 163 case 'A': 164 f_listdot = 1; 165 break; 166 /* The -d option turns off the -R option. */ 167 case 'd': 168 f_listdir = 1; 169 f_recursive = 0; 170 break; 171 case 'f': 172 f_nosort = 1; 173 break; 174 case 'g': /* Compatibility with 4.3BSD. */ 175 break; 176 case 'i': 177 f_inode = 1; 178 break; 179 case 'k': 180 f_kblocks = 1; 181 break; 182 case 'o': 183 f_flags = 1; 184 break; 185 case 'q': 186 f_nonprint = 1; 187 break; 188 case 'r': 189 f_reversesort = 1; 190 break; 191 case 's': 192 f_size = 1; 193 break; 194 case 'T': 195 f_sectime = 1; 196 break; 197 case 't': 198 f_timesort = 1; 199 break; 200 default: 201 case '?': 202 usage(); 203 } 204 } 205 argc -= optind; 206 argv += optind; 207 208 /* 209 * If not -F, -i, -l, -s or -t options, don't require stat 210 * information. 211 */ 212 if (!f_inode && !f_longform && !f_size && !f_timesort && !f_type) 213 fts_options |= FTS_NOSTAT; 214 215 /* 216 * If not -F, -d or -l options, follow any symbolic links listed on 217 * the command line. 218 */ 219 if (!f_longform && !f_listdir && !f_type) 220 fts_options |= FTS_COMFOLLOW; 221 222 /* If -l or -s, figure out block size. */ 223 if (f_longform || f_size) { 224 (void)getbsize(¬used, &blocksize); 225 blocksize /= 512; 226 if (f_kblocks) 227 blocksize *= 2; 228 } 229 230 /* Select a sort function. */ 231 if (f_reversesort) { 232 if (!f_timesort) 233 sortfcn = revnamecmp; 234 else if (f_accesstime) 235 sortfcn = revacccmp; 236 else if (f_statustime) 237 sortfcn = revstatcmp; 238 else /* Use modification time. */ 239 sortfcn = revmodcmp; 240 } else { 241 if (!f_timesort) 242 sortfcn = namecmp; 243 else if (f_accesstime) 244 sortfcn = acccmp; 245 else if (f_statustime) 246 sortfcn = statcmp; 247 else /* Use modification time. */ 248 sortfcn = modcmp; 249 } 250 251 /* Select a print function. */ 252 if (f_singlecol) 253 printfcn = printscol; 254 else if (f_longform) 255 printfcn = printlong; 256 else 257 printfcn = printcol; 258 259 if (argc) 260 traverse(argc, argv, fts_options); 261 else 262 traverse(1, dotav, fts_options); 263 exit(0); 264} 265 266static int output; /* If anything output. */ 267 268/* 269 * Traverse() walks the logical directory structure specified by the argv list 270 * in the order specified by the mastercmp() comparison function. During the 271 * traversal it passes linked lists of structures to display() which represent 272 * a superset (may be exact set) of the files to be displayed. 273 */ 274static void 275traverse(argc, argv, options) 276 int argc, options; 277 char *argv[]; 278{ 279 FTS *ftsp; 280 FTSENT *p, *chp; 281 int ch_options; 282 283 if ((ftsp = 284 fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL) 285 err(1, NULL); 286 287 display(NULL, fts_children(ftsp, 0)); 288 if (f_listdir) 289 return; 290 291 /* 292 * If not recursing down this tree and don't need stat info, just get 293 * the names. 294 */ 295 ch_options = !f_recursive && options & FTS_NOSTAT ? FTS_NAMEONLY : 0; 296 297 while ((p = fts_read(ftsp)) != NULL) 298 switch (p->fts_info) { 299 case FTS_DC: 300 warnx("%s: directory causes a cycle", p->fts_name); 301 break; 302 case FTS_DNR: 303 case FTS_ERR: 304 warnx("%s: %s", p->fts_name, strerror(p->fts_errno)); 305 break; 306 case FTS_D: 307 if (p->fts_level != FTS_ROOTLEVEL && 308 p->fts_name[0] == '.' && !f_listdot) 309 break; 310 311 /* 312 * If already output something, put out a newline as 313 * a separator. If multiple arguments, precede each 314 * directory with its name. 315 */ 316 if (output) 317 (void)printf("\n%s:\n", p->fts_path); 318 else if (argc > 1) { 319 (void)printf("%s:\n", p->fts_path); 320 output = 1; 321 } 322 323 chp = fts_children(ftsp, ch_options); 324 display(p, chp); 325 326 if (!f_recursive && chp != NULL) 327 (void)fts_set(ftsp, p, FTS_SKIP); 328 break; 329 } 330 if (errno) 331 err(1, "fts_read"); 332} 333 334/* 335 * Display() takes a linked list of FTSENT structures and passes the list 336 * along with any other necessary information to the print function. P 337 * points to the parent directory of the display list. 338 */ 339static void 340display(p, list) 341 FTSENT *p, *list; 342{ 343 struct stat *sp; 344 DISPLAY d; 345 FTSENT *cur; 346 NAMES *np; 347 u_quad_t maxsize; 348 u_long btotal, maxblock, maxinode, maxlen, maxnlink; 349 int bcfile, flen, glen, ulen, maxflags, maxgroup, maxuser; 350 int entries, needstats; 351 char *user, *group, *flags, buf[20]; /* 32 bits == 10 digits */ 352 353 /* 354 * If list is NULL there are two possibilities: that the parent 355 * directory p has no children, or that fts_children() returned an 356 * error. We ignore the error case since it will be replicated 357 * on the next call to fts_read() on the post-order visit to the 358 * directory p, and will be signalled in traverse(). 359 */ 360 if (list == NULL) 361 return; 362 363 needstats = f_inode || f_longform || f_size; 364 flen = 0; 365 btotal = maxblock = maxinode = maxlen = maxnlink = 0; 366 bcfile = 0; 367 maxuser = maxgroup = maxflags = 0; 368 maxsize = 0; 369 for (cur = list, entries = 0; cur; cur = cur->fts_link) { 370 if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) { 371 warnx("%s: %s", 372 cur->fts_name, strerror(cur->fts_errno)); 373 cur->fts_number = NO_PRINT; 374 continue; 375 } 376 377 /* 378 * P is NULL if list is the argv list, to which different rules 379 * apply. 380 */ 381 if (p == NULL) { 382 /* Directories will be displayed later. */ 383 if (cur->fts_info == FTS_D && !f_listdir) { 384 cur->fts_number = NO_PRINT; 385 continue; 386 } 387 } else { 388 /* Only display dot file if -a/-A set. */ 389 if (cur->fts_name[0] == '.' && !f_listdot) { 390 cur->fts_number = NO_PRINT; 391 continue; 392 } 393 } 394 if (f_nonprint) 395 prcopy(cur->fts_name, cur->fts_name, cur->fts_namelen); 396 if (cur->fts_namelen > maxlen) 397 maxlen = cur->fts_namelen; 398 if (needstats) { 399 sp = cur->fts_statp; 400 if (sp->st_blocks > maxblock) 401 maxblock = sp->st_blocks; 402 if (sp->st_ino > maxinode) 403 maxinode = sp->st_ino; 404 if (sp->st_nlink > maxnlink) 405 maxnlink = sp->st_nlink; 406 if (sp->st_size > maxsize) 407 maxsize = sp->st_size; 408 409 btotal += sp->st_blocks; 410 if (f_longform) { 411 user = user_from_uid(sp->st_uid, 0); 412 if ((ulen = strlen(user)) > maxuser) 413 maxuser = ulen; 414 group = group_from_gid(sp->st_gid, 0); 415 if ((glen = strlen(group)) > maxgroup) 416 maxgroup = glen; 417 if (f_flags) { 418 flags = 419 flags_to_string(sp->st_flags, "-"); 420 if ((flen = strlen(flags)) > maxflags) 421 maxflags = flen; 422 } else 423 flen = 0; 424 425 if ((np = malloc(sizeof(NAMES) + 426 ulen + glen + flen + 3)) == NULL) 427 err(1, NULL); 428 429 np->user = &np->data[0]; 430 (void)strcpy(np->user, user); 431 np->group = &np->data[ulen + 1]; 432 (void)strcpy(np->group, group); 433 434 if (S_ISCHR(sp->st_mode) || 435 S_ISBLK(sp->st_mode)) 436 bcfile = 1; 437 438 if (f_flags) { 439 np->flags = &np->data[ulen + glen + 2]; 440 (void)strcpy(np->flags, flags); 441 } 442 cur->fts_pointer = np; 443 } 444 } 445 ++entries; 446 } 447 448 if (!entries) 449 return; 450 451 d.list = list; 452 d.entries = entries; 453 d.maxlen = maxlen; 454 if (needstats) { 455 d.bcfile = bcfile; 456 d.btotal = btotal; 457 (void)snprintf(buf, sizeof(buf), "%lu", maxblock); 458 d.s_block = strlen(buf); 459 d.s_flags = maxflags; 460 d.s_group = maxgroup; 461 (void)snprintf(buf, sizeof(buf), "%lu", maxinode); 462 d.s_inode = strlen(buf); 463 (void)snprintf(buf, sizeof(buf), "%lu", maxnlink); 464 d.s_nlink = strlen(buf); 465 (void)snprintf(buf, sizeof(buf), "%qu", maxsize); 466 d.s_size = strlen(buf); 467 d.s_user = maxuser; 468 } 469 470 printfcn(&d); 471 output = 1; 472 473 if (f_longform) 474 for (cur = list; cur; cur = cur->fts_link) 475 free(cur->fts_pointer); 476} 477 478/* 479 * Ordering for mastercmp: 480 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories 481 * as larger than directories. Within either group, use the sort function. 482 * All other levels use the sort function. Error entries remain unsorted. 483 */ 484static int 485mastercmp(a, b) 486 const FTSENT **a, **b; 487{ 488 int a_info, b_info; 489 490 a_info = (*a)->fts_info; 491 if (a_info == FTS_ERR) 492 return (0); 493 b_info = (*b)->fts_info; 494 if (b_info == FTS_ERR) 495 return (0); 496 497 if (a_info == FTS_NS || b_info == FTS_NS) 498 return (namecmp(*a, *b)); 499 500 if (a_info == b_info) 501 return (sortfcn(*a, *b)); 502 503 if ((*a)->fts_level == FTS_ROOTLEVEL) 504 if (a_info == FTS_D) 505 return (1); 506 else if (b_info == FTS_D) 507 return (-1); 508 else 509 return (sortfcn(*a, *b)); 510 else 511 return (sortfcn(*a, *b)); 512} 513