ls.c revision 1.2
1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * 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 38 char copyright[] = 39 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\ 40 All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 static char sccsid[] = "@(#)ls.c 5.48 (Berkeley) 4/3/91"; 45 static char rcsid[] = "$Id: ls.c,v 1.2 1993/03/22 08:04:00 cgd Exp $"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/stat.h> 50 #include <sys/ioctl.h> 51 #include <dirent.h> 52 #include <string.h> 53 #include <errno.h> 54 #include <stdio.h> 55 #include "ls.h" 56 57 int (*sortfcn)(), (*printfcn)(); 58 int lstat(); 59 char *emalloc(); 60 61 int termwidth = 80; /* default terminal width */ 62 63 /* flags */ 64 int f_accesstime; /* use time of last access */ 65 int f_column; /* columnated format */ 66 int f_group; /* show group ownership of a file */ 67 int f_ignorelink; /* indirect through symbolic link operands */ 68 int f_inode; /* print inode */ 69 int f_kblocks; /* print size in kilobytes */ 70 int f_listalldot; /* list . and .. as well */ 71 int f_listdir; /* list actual directory, not contents */ 72 int f_listdot; /* list files beginning with . */ 73 int f_longform; /* long listing format */ 74 int f_needstat; /* if need to stat files */ 75 int f_newline; /* if precede with newline */ 76 int f_nonprint; /* show unprintables as ? */ 77 int f_nosort; /* don't sort output */ 78 int f_recursive; /* ls subdirectories also */ 79 int f_reversesort; /* reverse whatever sort is used */ 80 int f_sectime; /* print the real time for all files */ 81 int f_singlecol; /* use single column output */ 82 int f_size; /* list size in short listing */ 83 int f_statustime; /* use time of last mode change */ 84 int f_dirname; /* if precede with directory name */ 85 int f_timesort; /* sort by time vice name */ 86 int f_total; /* if precede with "total" line */ 87 int f_type; /* add type character for non-regular files */ 88 89 int (*statfcn)(), stat(), lstat(); 90 91 main(argc, argv) 92 int argc; 93 char **argv; 94 { 95 extern int optind, stat(); 96 struct winsize win; 97 int ch; 98 char *p, *getenv(); 99 int acccmp(), modcmp(), namecmp(), prcopy(), printcol(); 100 int printlong(), printscol(), revacccmp(), revmodcmp(), revnamecmp(); 101 int revstatcmp(), statcmp(); 102 103 /* terminal defaults to -Cq, non-terminal defaults to -1 */ 104 if (isatty(1)) { 105 f_nonprint = 1; 106 if (ioctl(1, TIOCGWINSZ, &win) == -1 || !win.ws_col) { 107 if (p = getenv("COLUMNS")) 108 termwidth = atoi(p); 109 } 110 else 111 termwidth = win.ws_col; 112 f_column = 1; 113 } else 114 f_singlecol = 1; 115 116 /* root is -A automatically */ 117 if (!getuid()) 118 f_listdot = 1; 119 120 while ((ch = getopt(argc, argv, "1ACFLRTacdfgiklqrstu")) != EOF) { 121 switch (ch) { 122 /* 123 * -1, -C and -l all override each other 124 * so shell aliasing works right 125 */ 126 case '1': 127 f_singlecol = 1; 128 f_column = f_longform = 0; 129 break; 130 case 'C': 131 f_column = 1; 132 f_longform = f_singlecol = 0; 133 break; 134 case 'l': 135 f_longform = 1; 136 f_column = f_singlecol = 0; 137 break; 138 /* -c and -u override each other */ 139 case 'c': 140 f_statustime = 1; 141 f_accesstime = 0; 142 break; 143 case 'u': 144 f_accesstime = 1; 145 f_statustime = 0; 146 break; 147 case 'F': 148 f_type = 1; 149 break; 150 case 'L': 151 f_ignorelink = 1; 152 break; 153 case 'R': 154 f_recursive = 1; 155 break; 156 case 'a': 157 f_listalldot = 1; 158 /* FALLTHROUGH */ 159 case 'A': 160 f_listdot = 1; 161 break; 162 case 'd': 163 f_listdir = 1; 164 break; 165 case 'f': 166 f_nosort = 1; 167 break; 168 case 'g': 169 f_group = 1; 170 break; 171 case 'i': 172 f_inode = 1; 173 break; 174 case 'k': 175 f_kblocks = 1; 176 break; 177 case 'q': 178 f_nonprint = 1; 179 break; 180 case 'r': 181 f_reversesort = 1; 182 break; 183 case 's': 184 f_size = 1; 185 break; 186 case 'T': 187 f_sectime = 1; 188 break; 189 case 't': 190 f_timesort = 1; 191 break; 192 default: 193 case '?': 194 usage(); 195 } 196 } 197 argc -= optind; 198 argv += optind; 199 200 /* -d turns off -R */ 201 if (f_listdir) 202 f_recursive = 0; 203 204 /* if need to stat files */ 205 f_needstat = f_longform || f_recursive || f_timesort || 206 f_size || f_type; 207 208 /* select a sort function */ 209 if (f_reversesort) { 210 if (!f_timesort) 211 sortfcn = revnamecmp; 212 else if (f_accesstime) 213 sortfcn = revacccmp; 214 else if (f_statustime) 215 sortfcn = revstatcmp; 216 else /* use modification time */ 217 sortfcn = revmodcmp; 218 } else { 219 if (!f_timesort) 220 sortfcn = namecmp; 221 else if (f_accesstime) 222 sortfcn = acccmp; 223 else if (f_statustime) 224 sortfcn = statcmp; 225 else /* use modification time */ 226 sortfcn = modcmp; 227 } 228 229 /* select a print function */ 230 if (f_singlecol) 231 printfcn = printscol; 232 else if (f_longform) 233 printfcn = printlong; 234 else 235 printfcn = printcol; 236 237 /* if -l, -d, -R, or -F, and not ignoring the link, use lstat() */ 238 statfcn = 239 (f_longform || f_listdir || f_type || f_recursive) && !f_ignorelink ? lstat : stat; 240 241 if (!argc) { 242 static char dot[] = "."; 243 244 argc = 1; 245 argv[0] = dot; 246 argv[1] = NULL; 247 } 248 doargs(argc, argv); 249 exit(0); 250 } 251 252 static char path[MAXPATHLEN + 1]; 253 static char *endofpath = path; 254 255 doargs(argc, argv) 256 int argc; 257 char **argv; 258 { 259 register LS *dstatp, *rstatp; 260 register int cnt, dircnt, maxlen, regcnt; 261 LS *dstats, *rstats; 262 struct stat sb; 263 char top[MAXPATHLEN + 1]; 264 u_long blocks; 265 266 /* 267 * walk through the operands, building separate arrays of LS 268 * structures for directory and non-directory files. 269 */ 270 dstats = rstats = NULL; 271 for (dircnt = regcnt = 0; *argv; ++argv) { 272 if (statfcn(*argv, &sb) && 273 (statfcn == lstat || lstat(*argv, &sb))) { 274 (void)fprintf(stderr, 275 "ls: %s: %s\n", *argv, strerror(errno)); 276 if (errno == ENOENT) 277 continue; 278 exit(1); 279 } 280 if (S_ISDIR(sb.st_mode) && !f_listdir) { 281 if (!dstats) 282 dstatp = dstats = (LS *)emalloc((u_int)argc * 283 (sizeof(LS))); 284 dstatp->name = *argv; 285 dstatp->lstat = sb; 286 ++dstatp; 287 ++dircnt; 288 } 289 else { 290 if (!rstats) { 291 rstatp = rstats = (LS *)emalloc((u_int)argc * 292 (sizeof(LS))); 293 blocks = 0; 294 maxlen = -1; 295 } 296 rstatp->name = *argv; 297 rstatp->lstat = sb; 298 299 /* save name length for -C format */ 300 rstatp->len = strlen(*argv); 301 302 if (f_nonprint) 303 prcopy(*argv, *argv, rstatp->len); 304 305 /* calculate number of blocks if -l/-s formats */ 306 if (f_longform || f_size) 307 blocks += sb.st_blocks; 308 309 /* save max length if -C format */ 310 if (f_column && maxlen < rstatp->len) 311 maxlen = rstatp->len; 312 313 ++rstatp; 314 ++regcnt; 315 } 316 } 317 /* display regular files */ 318 if (regcnt) { 319 rstats[0].lstat.st_btotal = blocks; 320 rstats[0].lstat.st_maxlen = maxlen; 321 displaydir(rstats, regcnt); 322 f_newline = f_dirname = 1; 323 } 324 /* display directories */ 325 if (dircnt) { 326 register char *p; 327 328 f_total = 1; 329 if (dircnt > 1) { 330 (void)getwd(top); 331 qsort((char *)dstats, dircnt, sizeof(LS), sortfcn); 332 f_dirname = 1; 333 } 334 for (cnt = 0; cnt < dircnt; ++dstats) { 335 for (endofpath = path, p = dstats->name; 336 *endofpath = *p++; ++endofpath); 337 subdir(dstats); 338 f_newline = 1; 339 if (++cnt < dircnt && chdir(top)) { 340 (void)fprintf(stderr, "ls: %s: %s\n", 341 top, strerror(errno)); 342 exit(1); 343 } 344 } 345 } 346 } 347 348 displaydir(stats, num) 349 LS *stats; 350 register int num; 351 { 352 register char *p, *savedpath; 353 LS *lp; 354 355 if (num > 1 && !f_nosort) { 356 u_long save1, save2; 357 358 save1 = stats[0].lstat.st_btotal; 359 save2 = stats[0].lstat.st_maxlen; 360 qsort((char *)stats, num, sizeof(LS), sortfcn); 361 stats[0].lstat.st_btotal = save1; 362 stats[0].lstat.st_maxlen = save2; 363 } 364 365 printfcn(stats, num); 366 367 if (f_recursive) { 368 savedpath = endofpath; 369 for (lp = stats; num--; ++lp) { 370 if (!S_ISDIR(lp->lstat.st_mode)) 371 continue; 372 p = lp->name; 373 if (p[0] == '.' && (!p[1] || p[1] == '.' && !p[2])) 374 continue; 375 if (endofpath != path && endofpath[-1] != '/') 376 *endofpath++ = '/'; 377 for (; *endofpath = *p++; ++endofpath); 378 f_newline = f_dirname = f_total = 1; 379 subdir(lp); 380 *(endofpath = savedpath) = '\0'; 381 } 382 } 383 } 384 385 subdir(lp) 386 LS *lp; 387 { 388 LS *stats; 389 int num; 390 char *names; 391 392 if (f_newline) 393 (void)putchar('\n'); 394 if (f_dirname) 395 (void)printf("%s:\n", path); 396 397 if (chdir(lp->name)) { 398 (void)fprintf(stderr, "ls: %s: %s\n", lp->name, 399 strerror(errno)); 400 return; 401 } 402 if (num = tabdir(lp, &stats, &names)) { 403 displaydir(stats, num); 404 (void)free((char *)stats); 405 (void)free((char *)names); 406 } 407 if (chdir("..")) { 408 (void)fprintf(stderr, "ls: ..: %s\n", strerror(errno)); 409 exit(1); 410 } 411 } 412 413 tabdir(lp, s_stats, s_names) 414 LS *lp, **s_stats; 415 char **s_names; 416 { 417 register DIR *dirp; 418 register int cnt, maxentry, maxlen; 419 register char *p, *names; 420 struct dirent *dp; 421 u_long blocks; 422 LS *stats; 423 424 if (!(dirp = opendir("."))) { 425 (void)fprintf(stderr, "ls: %s: %s\n", lp->name, 426 strerror(errno)); 427 return(0); 428 } 429 blocks = maxentry = maxlen = 0; 430 stats = NULL; 431 for (cnt = 0; dp = readdir(dirp);) { 432 /* this does -A and -a */ 433 p = dp->d_name; 434 if (p[0] == '.') { 435 if (!f_listdot) 436 continue; 437 if (!f_listalldot && (!p[1] || p[1] == '.' && !p[2])) 438 continue; 439 } 440 if (cnt == maxentry) { 441 if (!maxentry) 442 *s_names = names = 443 emalloc((u_int)lp->lstat.st_size); 444 #define DEFNUM 256 445 maxentry += DEFNUM; 446 if (!(*s_stats = stats = (LS *)realloc((char *)stats, 447 (u_int)maxentry * sizeof(LS)))) 448 nomem(); 449 } 450 if (f_needstat && statfcn(dp->d_name, &stats[cnt].lstat) && 451 statfcn == stat && lstat(dp->d_name, &stats[cnt].lstat)) { 452 /* 453 * don't exit -- this could be an NFS mount that has 454 * gone away. Flush stdout so the messages line up. 455 */ 456 (void)fflush(stdout); 457 (void)fprintf(stderr, 458 "ls: %s: %s\n", dp->d_name, strerror(errno)); 459 continue; 460 } 461 stats[cnt].name = names; 462 463 if (f_nonprint) 464 prcopy(dp->d_name, names, (int)dp->d_namlen); 465 else 466 bcopy(dp->d_name, names, (int)dp->d_namlen); 467 names += dp->d_namlen; 468 *names++ = '\0'; 469 470 /* 471 * get the inode from the directory, so the -f flag 472 * works right. 473 */ 474 stats[cnt].lstat.st_ino = dp->d_ino; 475 476 /* save name length for -C format */ 477 stats[cnt].len = dp->d_namlen; 478 479 /* calculate number of blocks if -l/-s formats */ 480 if (f_longform || f_size) 481 blocks += stats[cnt].lstat.st_blocks; 482 483 /* save max length if -C format */ 484 if (f_column && maxlen < (int)dp->d_namlen) 485 maxlen = dp->d_namlen; 486 ++cnt; 487 } 488 (void)closedir(dirp); 489 490 if (cnt) { 491 stats[0].lstat.st_btotal = blocks; 492 stats[0].lstat.st_maxlen = maxlen; 493 } else if (stats) { 494 (void)free((char *)stats); 495 (void)free((char *)names); 496 } 497 return(cnt); 498 } 499
Indexes created Sun Oct 26 13:09:57 GMT 2025