coreutils/ls.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 1996 Brian Candler <B.Candler@pobox.com>
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   6  */
   7 /* [date unknown. Perhaps before year 2000]
   8  * To achieve a small memory footprint, this version of 'ls' doesn't do any
   9  * file sorting, and only has the most essential command line switches
  10  * (i.e., the ones I couldn't live without :-) All features which involve
  11  * linking in substantial chunks of libc can be disabled.
  12  *
  13  * Although I don't really want to add new features to this program to
  14  * keep it small, I *am* interested to receive bug fixes and ways to make
  15  * it more portable.
  16  *
  17  * KNOWN BUGS:
  18  * 1. hidden files can make column width too large
  19  *
  20  * NON-OPTIMAL BEHAVIOUR:
  21  * 1. autowidth reads directories twice
  22  * 2. if you do a short directory listing without filetype characters
  23  *    appended, there's no need to stat each one
  24  * PORTABILITY:
  25  * 1. requires lstat (BSD) - how do you do it without?
  26  *
  27  * [2009-03]
  28  * ls sorts listing now, and supports almost all options.
  29  */
  30 //config:config LS
  31 //config:       bool "ls (14 kb)"
  32 //config:       default y
  33 //config:       help
  34 //config:       ls is used to list the contents of directories.
  35 //config:
  36 //config:config FEATURE_LS_FILETYPES
  37 //config:       bool "Enable filetyping options (-p and -F)"
  38 //config:       default y
  39 //config:       depends on LS
  40 //config:
  41 //config:config FEATURE_LS_FOLLOWLINKS
  42 //config:       bool "Enable symlinks dereferencing (-L)"
  43 //config:       default y
  44 //config:       depends on LS
  45 //config:
  46 //config:config FEATURE_LS_RECURSIVE
  47 //config:       bool "Enable recursion (-R)"
  48 //config:       default y
  49 //config:       depends on LS
  50 //config:
  51 //config:config FEATURE_LS_WIDTH
  52 //config:       bool "Enable -w WIDTH and window size autodetection"
  53 //config:       default y
  54 //config:       depends on LS
  55 //config:
  56 //config:config FEATURE_LS_SORTFILES
  57 //config:       bool "Sort the file names"
  58 //config:       default y
  59 //config:       depends on LS
  60 //config:       help
  61 //config:       Allow ls to sort file names alphabetically.
  62 //config:
  63 //config:config FEATURE_LS_TIMESTAMPS
  64 //config:       bool "Show file timestamps"
  65 //config:       default y
  66 //config:       depends on LS
  67 //config:       help
  68 //config:       Allow ls to display timestamps for files.
  69 //config:
  70 //config:config FEATURE_LS_USERNAME
  71 //config:       bool "Show username/groupnames"
  72 //config:       default y
  73 //config:       depends on LS
  74 //config:       help
  75 //config:       Allow ls to display username/groupname for files.
  76 //config:
  77 //config:config FEATURE_LS_COLOR
  78 //config:       bool "Allow use of color to identify file types"
  79 //config:       default y
  80 //config:       depends on LS && LONG_OPTS
  81 //config:       help
  82 //config:       This enables the --color option to ls.
  83 //config:
  84 //config:config FEATURE_LS_COLOR_IS_DEFAULT
  85 //config:       bool "Produce colored ls output by default"
  86 //config:       default y
  87 //config:       depends on FEATURE_LS_COLOR
  88 //config:       help
  89 //config:       Saying yes here will turn coloring on by default,
  90 //config:       even if no "--color" option is given to the ls command.
  91 //config:       This is not recommended, since the colors are not
  92 //config:       configurable, and the output may not be legible on
  93 //config:       many output screens.
  94
  95 //applet:IF_LS(APPLET_NOEXEC(ls, ls, BB_DIR_BIN, BB_SUID_DROP, ls))
  96
  97 //kbuild:lib-$(CONFIG_LS) += ls.o
  98
  99 //usage:#define ls_trivial_usage
 100 //usage:        "[-1AaCxd"
 101 //usage:        IF_FEATURE_LS_FOLLOWLINKS("LH")
 102 //usage:        IF_FEATURE_LS_RECURSIVE("R")
 103 //usage:        IF_FEATURE_LS_FILETYPES("Fp") "lins"
 104 //usage:        IF_FEATURE_HUMAN_READABLE("h")
 105 //usage:        IF_FEATURE_LS_SORTFILES("rSXv")
 106 //usage:        IF_FEATURE_LS_TIMESTAMPS("ctu")
 107 //usage:        IF_SELINUX("kZ") "]"
 108 //usage:        IF_FEATURE_LS_WIDTH(" [-w WIDTH]") " [FILE]..."
 109 //usage:#define ls_full_usage "\n\n"
 110 //usage:       "List directory contents\n"
 111 //usage:     "\n        -1      One column output"
 112 //usage:     "\n        -a      Include names starting with ."
 113 //usage:     "\n        -A      Like -a, but exclude . and .."
 114 ////usage:     "\n      -C      List by columns" - don't show, this is a default anyway
 115 //usage:     "\n        -x      List by lines"
 116 //usage:     "\n        -d      List directory names, not contents"
 117 //usage:        IF_FEATURE_LS_FOLLOWLINKS(
 118 //usage:     "\n        -L      Follow symlinks"
 119 //usage:     "\n        -H      Follow symlinks on command line"
 120 //usage:        )
 121 //usage:        IF_FEATURE_LS_RECURSIVE(
 122 //usage:     "\n        -R      Recurse"
 123 //usage:        )
 124 //usage:        IF_FEATURE_LS_FILETYPES(
 125 //usage:     "\n        -p      Append / to directory names"
 126 //usage:     "\n        -F      Append indicator (one of */=@|) to names"
 127 //usage:        )
 128 //usage:     "\n        -l      Long format"
 129 //usage:     "\n        -i      List inode numbers"
 130 //usage:     "\n        -n      List numeric UIDs and GIDs instead of names"
 131 //usage:     "\n        -s      List allocated blocks"
 132 //usage:        IF_FEATURE_LS_TIMESTAMPS(
 133 //usage:     "\n        -lc     List ctime"
 134 //usage:     "\n        -lu     List atime"
 135 //usage:        )
 136 //usage:        IF_FEATURE_LS_TIMESTAMPS(IF_LONG_OPTS(
 137 //usage:     "\n        --full-time     List full date/time"
 138 //usage:        ))
 139 //usage:        IF_FEATURE_HUMAN_READABLE(
 140 //usage:     "\n        -h      Human readable sizes (1K 243M 2G)"
 141 //usage:        )
 142 //usage:        IF_FEATURE_LS_SORTFILES(
 143 //usage:        IF_LONG_OPTS(
 144 //usage:     "\n        --group-directories-first"
 145 //usage:        )
 146 //usage:     "\n        -S      Sort by size"
 147 //usage:     "\n        -X      Sort by extension"
 148 //usage:     "\n        -v      Sort by version"
 149 //usage:        )
 150 //usage:        IF_FEATURE_LS_TIMESTAMPS(
 151 //usage:     "\n        -t      Sort by mtime"
 152 //usage:     "\n        -tc     Sort by ctime"
 153 //usage:     "\n        -tu     Sort by atime"
 154 //usage:        )
 155 //usage:     "\n        -r      Reverse sort order"
 156 //usage:        IF_SELINUX(
 157 //usage:     "\n        -Z      List security context and permission"
 158 //usage:        )
 159 //usage:        IF_FEATURE_LS_WIDTH(
 160 //usage:     "\n        -w N    Format N columns wide"
 161 //usage:        )
 162 //usage:        IF_FEATURE_LS_COLOR(
 163 //usage:     "\n        --color[={always,never,auto}]"
 164 //usage:        )
 165
 166 #include "libbb.h"
 167 #include "common_bufsiz.h"
 168 #include "unicode.h"
 169
 170
 171 /* This is a NOEXEC applet. Be very careful! */
 172
 173
 174 #if ENABLE_FTPD
 175 /* ftpd uses ls, and without timestamps Mozilla won't understand
 176  * ftpd's LIST output.
 177  */
 178 # undef CONFIG_FEATURE_LS_TIMESTAMPS
 179 # undef ENABLE_FEATURE_LS_TIMESTAMPS
 180 # undef IF_FEATURE_LS_TIMESTAMPS
 181 # undef IF_NOT_FEATURE_LS_TIMESTAMPS
 182 # define CONFIG_FEATURE_LS_TIMESTAMPS 1
 183 # define ENABLE_FEATURE_LS_TIMESTAMPS 1
 184 # define IF_FEATURE_LS_TIMESTAMPS(...) __VA_ARGS__
 185 # define IF_NOT_FEATURE_LS_TIMESTAMPS(...)
 186 #endif
 187
 188
 189 enum {
 190 TERMINAL_WIDTH  = 80, /* use 79 if terminal has linefold bug */
 191
 192 SPLIT_FILE      = 0,
 193 SPLIT_DIR       = 1,
 194 SPLIT_SUBDIR    = 2,
 195 };
 196
 197 /* -Cadi1l  Std options, busybox always supports */
 198 /* -gnsxA   Std options, busybox always supports */
 199 /* -Q       GNU option, busybox always supports */
 200 /* -k       Std option, busybox always supports (by ignoring) */
 201 /*          It means "for -s, show sizes in kbytes" */
 202 /*          Seems to only affect "POSIXLY_CORRECT=1 ls -sk" */
 203 /*          since otherwise -s shows kbytes anyway */
 204 /* -LHRctur Std options, busybox optionally supports */
 205 /* -Fp      Std options, busybox optionally supports */
 206 /* -SXvhTw  GNU options, busybox optionally supports */
 207 /* -T WIDTH Ignored (we don't use tabs on output) */
 208 /* -Z       SELinux mandated option, busybox optionally supports */
 209 #define ls_options \
 210         "Cadi1lgnsxAk"       /* 12 opts, total 12 */ \
 211         IF_FEATURE_LS_FILETYPES("Fp")    /* 2, 14 */ \
 212         IF_FEATURE_LS_RECURSIVE("R")     /* 1, 15 */ \
 213         IF_SELINUX("Z")                  /* 1, 16 */ \
 214         "Q"                              /* 1, 17 */ \
 215         IF_FEATURE_LS_TIMESTAMPS("ctu")  /* 3, 20 */ \
 216         IF_FEATURE_LS_SORTFILES("SXrv")  /* 4, 24 */ \
 217         IF_FEATURE_LS_FOLLOWLINKS("LH")  /* 2, 26 */ \
 218         IF_FEATURE_HUMAN_READABLE("h")   /* 1, 27 */ \
 219         IF_FEATURE_LS_WIDTH("T:w:")      /* 2, 29 */
 220
 221 enum {
 222         OPT_C = (1 << 0),
 223         OPT_a = (1 << 1),
 224         OPT_d = (1 << 2),
 225         OPT_i = (1 << 3),
 226         OPT_1 = (1 << 4),
 227         OPT_l = (1 << 5),
 228         OPT_g = (1 << 6),
 229         OPT_n = (1 << 7),
 230         OPT_s = (1 << 8),
 231         OPT_x = (1 << 9),
 232         OPT_A = (1 << 10),
 233         //OPT_k = (1 << 11),
 234
 235         OPTBIT_F = 12,
 236         OPTBIT_p, /* 13 */
 237         OPTBIT_R = OPTBIT_F + 2 * ENABLE_FEATURE_LS_FILETYPES,
 238         OPTBIT_Z = OPTBIT_R + 1 * ENABLE_FEATURE_LS_RECURSIVE,
 239         OPTBIT_Q = OPTBIT_Z + 1 * ENABLE_SELINUX,
 240         OPTBIT_c, /* 17 */
 241         OPTBIT_t, /* 18 */
 242         OPTBIT_u, /* 19 */
 243         OPTBIT_S = OPTBIT_c + 3 * ENABLE_FEATURE_LS_TIMESTAMPS,
 244         OPTBIT_X, /* 21 */
 245         OPTBIT_r, /* 22 */
 246         OPTBIT_v, /* 23 */
 247         OPTBIT_L = OPTBIT_S + 4 * ENABLE_FEATURE_LS_SORTFILES,
 248         OPTBIT_H, /* 25 */
 249         OPTBIT_h = OPTBIT_L + 2 * ENABLE_FEATURE_LS_FOLLOWLINKS,
 250         OPTBIT_T = OPTBIT_h + 1 * ENABLE_FEATURE_HUMAN_READABLE,
 251         OPTBIT_w, /* 28 */
 252         OPTBIT_full_time = OPTBIT_T + 2 * ENABLE_FEATURE_LS_WIDTH,
 253         OPTBIT_dirs_first,
 254         OPTBIT_color, /* 31 */
 255         /* with long opts, we use all 32 bits */
 256
 257         OPT_F = (1 << OPTBIT_F) * ENABLE_FEATURE_LS_FILETYPES,
 258         OPT_p = (1 << OPTBIT_p) * ENABLE_FEATURE_LS_FILETYPES,
 259         OPT_R = (1 << OPTBIT_R) * ENABLE_FEATURE_LS_RECURSIVE,
 260         OPT_Z = (1 << OPTBIT_Z) * ENABLE_SELINUX,
 261         OPT_Q = (1 << OPTBIT_Q),
 262         OPT_c = (1 << OPTBIT_c) * ENABLE_FEATURE_LS_TIMESTAMPS,
 263         OPT_t = (1 << OPTBIT_t) * ENABLE_FEATURE_LS_TIMESTAMPS,
 264         OPT_u = (1 << OPTBIT_u) * ENABLE_FEATURE_LS_TIMESTAMPS,
 265         OPT_S = (1 << OPTBIT_S) * ENABLE_FEATURE_LS_SORTFILES,
 266         OPT_X = (1 << OPTBIT_X) * ENABLE_FEATURE_LS_SORTFILES,
 267         OPT_r = (1 << OPTBIT_r) * ENABLE_FEATURE_LS_SORTFILES,
 268         OPT_v = (1 << OPTBIT_v) * ENABLE_FEATURE_LS_SORTFILES,
 269         OPT_L = (1 << OPTBIT_L) * ENABLE_FEATURE_LS_FOLLOWLINKS,
 270         OPT_H = (1 << OPTBIT_H) * ENABLE_FEATURE_LS_FOLLOWLINKS,
 271         OPT_h = (1 << OPTBIT_h) * ENABLE_FEATURE_HUMAN_READABLE,
 272         OPT_T = (1 << OPTBIT_T) * ENABLE_FEATURE_LS_WIDTH,
 273         OPT_w = (1 << OPTBIT_w) * ENABLE_FEATURE_LS_WIDTH,
 274         OPT_full_time  = (1 << OPTBIT_full_time ) * ENABLE_LONG_OPTS,
 275         OPT_dirs_first = (1 << OPTBIT_dirs_first) * ENABLE_LONG_OPTS,
 276         OPT_color      = (1 << OPTBIT_color     ) * ENABLE_FEATURE_LS_COLOR,
 277 };
 278
 279 /*
 280  * a directory entry and its stat info
 281  */
 282 struct dnode {
 283         const char *name;       /* usually basename, but think "ls -l dir/file" */
 284         const char *fullname;   /* full name (usable for stat etc) */
 285         struct dnode *dn_next;  /* for linked list */
 286         IF_SELINUX(security_context_t sid;)
 287         smallint fname_allocated;
 288
 289         /* Used to avoid re-doing [l]stat at printout stage
 290          * if we already collected needed data in scan stage:
 291          */
 292         mode_t    dn_mode_lstat;   /* obtained with lstat, or 0 */
 293         mode_t    dn_mode_stat;    /* obtained with stat, or 0 */
 294
 295 //      struct stat dstat;
 296 // struct stat is huge. We don't need it in full.
 297 // At least we don't need st_dev and st_blksize,
 298 // but there are invisible fields as well
 299 // (such as nanosecond-resolution timespamps)
 300 // and padding, which we also don't want to store.
 301 // We also pre-parse dev_t dn_rdev (in glibc, it's huge).
 302 // On 32-bit uclibc: dnode size went from 112 to 84 bytes.
 303 //
 304         /* Same names as in struct stat, but with dn_ instead of st_ pfx: */
 305         mode_t    dn_mode; /* obtained with lstat OR stat, depending on -L etc */
 306         off_t     dn_size;
 307 #if ENABLE_FEATURE_LS_TIMESTAMPS || ENABLE_FEATURE_LS_SORTFILES
 308         time_t    dn_time;
 309 #endif
 310         ino_t     dn_ino;
 311         blkcnt_t  dn_blocks;
 312         nlink_t   dn_nlink;
 313         uid_t     dn_uid;
 314         gid_t     dn_gid;
 315         int       dn_rdev_maj;
 316         int       dn_rdev_min;
 317 //      dev_t     dn_dev;
 318 //      blksize_t dn_blksize;
 319 };
 320
 321 struct globals {
 322 #if ENABLE_FEATURE_LS_COLOR
 323         smallint show_color;
 324 # define G_show_color (G.show_color)
 325 #else
 326 # define G_show_color 0
 327 #endif
 328         smallint exit_code;
 329         smallint show_dirname;
 330 #if ENABLE_FEATURE_LS_WIDTH
 331         unsigned terminal_width;
 332 # define G_terminal_width (G.terminal_width)
 333 #else
 334 # define G_terminal_width TERMINAL_WIDTH
 335 #endif
 336 #if ENABLE_FEATURE_LS_TIMESTAMPS
 337         /* Do time() just once. Saves one syscall per file for "ls -l" */
 338         time_t current_time_t;
 339 #endif
 340 } FIX_ALIASING;
 341 #define G (*(struct globals*)bb_common_bufsiz1)
 342 #define INIT_G() do { \
 343         setup_common_bufsiz(); \
 344         /* we have to zero it out because of NOEXEC */ \
 345         memset(&G, 0, sizeof(G)); \
 346         IF_FEATURE_LS_WIDTH(G_terminal_width = TERMINAL_WIDTH;) \
 347         IF_FEATURE_LS_TIMESTAMPS(time(&G.current_time_t);) \
 348 } while (0)
 349
 350 #define ESC "\033"
 351
 352
 353 /*** Output code ***/
 354
 355
 356 /* FYI type values: 1:fifo 2:char 4:dir 6:blk 8:file 10:link 12:socket
 357  * (various wacky OSes: 13:Sun door 14:BSD whiteout 5:XENIX named file
 358  *  3/7:multiplexed char/block device)
 359  * and we use 0 for unknown and 15 for executables (see below) */
 360 #define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
 361 /*                       un  fi chr -   dir -  blk  -  file -  link - sock -   - exe */
 362 #define APPCHAR(mode)   ("\0""|""\0""\0""/""\0""\0""\0""\0""\0""@""\0""=""\0""\0""\0" [TYPEINDEX(mode)])
 363 /* 036 black foreground              050 black background
 364    037 red foreground                051 red background
 365    040 green foreground              052 green background
 366    041 brown foreground              053 brown background
 367    042 blue foreground               054 blue background
 368    043 magenta (purple) foreground   055 magenta background
 369    044 cyan (light blue) foreground  056 cyan background
 370    045 gray foreground               057 white background
 371 */
 372 #define COLOR(mode) ( \
 373         /*un  fi  chr  -  dir  -  blk  -  file -  link -  sock -   -  exe */ \
 374         "\037\043\043\045\042\045\043\043\000\045\044\045\043\045\045\040" \
 375         [TYPEINDEX(mode)])
 376 /* Select normal (0) [actually "reset all"] or bold (1)
 377  * (other attributes are 2:dim 4:underline 5:blink 7:reverse,
 378  *  let's use 7 for "impossible" types, just for fun)
 379  * Note: coreutils 6.9 uses inverted red for setuid binaries.
 380  */
 381 #define ATTR(mode) ( \
 382         /*un fi chr - dir - blk - file- link- sock- -  exe */ \
 383         "\01\00\01\07\01\07\01\07\00\07\01\07\01\07\07\01" \
 384         [TYPEINDEX(mode)])
 385
 386 #if ENABLE_FEATURE_LS_COLOR
 387 /* mode of zero is interpreted as "unknown" (stat failed) */
 388 static char fgcolor(mode_t mode)
 389 {
 390         if (S_ISREG(mode) && (mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
 391                 return COLOR(0xF000);   /* File is executable ... */
 392         return COLOR(mode);
 393 }
 394 static char bold(mode_t mode)
 395 {
 396         if (S_ISREG(mode) && (mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
 397                 return ATTR(0xF000);    /* File is executable ... */
 398         return ATTR(mode);
 399 }
 400 #endif
 401
 402 #if ENABLE_FEATURE_LS_FILETYPES
 403 static char append_char(mode_t mode)
 404 {
 405         if (!(option_mask32 & (OPT_F|OPT_p)))
 406                 return '\0';
 407
 408         if (S_ISDIR(mode))
 409                 return '/';
 410         if (!(option_mask32 & OPT_F))
 411                 return '\0';
 412         if (S_ISREG(mode) && (mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
 413                 return '*';
 414         return APPCHAR(mode);
 415 }
 416 #endif
 417
 418 static unsigned calc_name_len(const char *name)
 419 {
 420         unsigned len;
 421         uni_stat_t uni_stat;
 422
 423         // TODO: quote tab as \t, etc, if -Q
 424         name = printable_string2(&uni_stat, name);
 425
 426         if (!(option_mask32 & OPT_Q)) {
 427                 return uni_stat.unicode_width;
 428         }
 429
 430         len = 2 + uni_stat.unicode_width;
 431         while (*name) {
 432                 if (*name == '"' || *name == '\\') {
 433                         len++;
 434                 }
 435                 name++;
 436         }
 437         return len;
 438 }
 439
 440 /* Return the number of used columns.
 441  * Note that only columnar output uses return value.
 442  * -l and -1 modes don't care.
 443  * coreutils 7.2 also supports:
 444  * ls -b (--escape) = octal escapes (although it doesn't look like working)
 445  * ls -N (--literal) = not escape at all
 446  */
 447 static unsigned print_name(const char *name)
 448 {
 449         unsigned len;
 450         uni_stat_t uni_stat;
 451
 452         // TODO: quote tab as \t, etc, if -Q
 453         name = printable_string2(&uni_stat, name);
 454
 455         if (!(option_mask32 & OPT_Q)) {
 456                 fputs_stdout(name);
 457                 return uni_stat.unicode_width;
 458         }
 459
 460         len = 2 + uni_stat.unicode_width;
 461         putchar('"');
 462         while (*name) {
 463                 if (*name == '"' || *name == '\\') {
 464                         putchar('\\');
 465                         len++;
 466                 }
 467                 putchar(*name);
 468                 name++;
 469         }
 470         putchar('"');
 471         return len;
 472 }
 473
 474 /* Return the number of used columns.
 475  * Note that only columnar output uses return value,
 476  * -l and -1 modes don't care.
 477  */
 478 static NOINLINE unsigned display_single(const struct dnode *dn)
 479 {
 480         unsigned column = 0;
 481         char *lpath;
 482         int opt;
 483 #if ENABLE_FEATURE_LS_FILETYPES || ENABLE_FEATURE_LS_COLOR
 484         struct stat statbuf;
 485 #endif
 486 #if ENABLE_FEATURE_LS_FILETYPES
 487         char append = append_char(dn->dn_mode);
 488 #endif
 489
 490         opt = option_mask32;
 491
 492         /* Do readlink early, so that if it fails, error message
 493          * does not appear *inside* the "ls -l" line */
 494         lpath = NULL;
 495         if (opt & OPT_l)
 496                 if (S_ISLNK(dn->dn_mode))
 497                         lpath = xmalloc_readlink_or_warn(dn->fullname);
 498
 499         if (opt & OPT_i) /* show inode# */
 500                 column += printf("%7llu ", (long long) dn->dn_ino);
 501         if (opt & OPT_s) { /* show allocated blocks */
 502                 if (opt & OPT_h) {
 503                         column += printf("%"HUMAN_READABLE_MAX_WIDTH_STR"s ",
 504                                 /* print size, show one fractional, use suffixes */
 505                                 make_human_readable_str((off_t)dn->dn_blocks << 9, 1, 0)
 506                         );
 507                 } else {
 508                         column += printf("%6"OFF_FMT"u ", (off_t)(dn->dn_blocks >> 1));
 509                 }
 510         }
 511         if (opt & OPT_l) {
 512                 /* long listing: show mode */
 513                 char modestr[12];
 514                 column += printf("%-10s ", bb_mode_string(modestr, dn->dn_mode));
 515                 /* long listing: show number of links */
 516                 column += printf("%4lu ", (long) dn->dn_nlink);
 517                 /* long listing: show user/group */
 518                 if (opt & OPT_n) {
 519                         if (opt & OPT_g)
 520                                 column += printf("%-8u ", (int) dn->dn_gid);
 521                         else
 522                                 column += printf("%-8u %-8u ",
 523                                                 (int) dn->dn_uid,
 524                                                 (int) dn->dn_gid);
 525                 }
 526 #if ENABLE_FEATURE_LS_USERNAME
 527                 else {
 528                         if (opt & OPT_g) {
 529                                 column += printf("%-8s ",
 530                                         get_cached_groupname(dn->dn_gid));
 531                         } else {
 532                                 column += printf("%-8s %-8s ",
 533                                         get_cached_username(dn->dn_uid),
 534                                         get_cached_groupname(dn->dn_gid));
 535                         }
 536                 }
 537 #endif
 538 #if ENABLE_SELINUX
 539         }
 540         if (opt & OPT_Z) {
 541                 column += printf("%-32s ", dn->sid ? dn->sid : "?");
 542                 freecon(dn->sid);
 543         }
 544         if (opt & OPT_l) {
 545 #endif
 546                 /* long listing: show size */
 547                 if (S_ISBLK(dn->dn_mode) || S_ISCHR(dn->dn_mode)) {
 548                         column += printf("%4u, %3u ",
 549                                         dn->dn_rdev_maj,
 550                                         dn->dn_rdev_min);
 551                 } else {
 552                         if (opt & OPT_h) {
 553                                 column += printf("%"HUMAN_READABLE_MAX_WIDTH_STR"s ",
 554                                         /* print size, show one fractional, use suffixes */
 555                                         make_human_readable_str(dn->dn_size, 1, 0)
 556                                 );
 557                         } else {
 558                                 column += printf("%9"OFF_FMT"u ", dn->dn_size);
 559                         }
 560                 }
 561 #if ENABLE_FEATURE_LS_TIMESTAMPS
 562                 /* long listing: show {m,c,a}time */
 563                 if (opt & OPT_full_time) { /* --full-time */
 564                         /* coreutils 8.4 ls --full-time prints:
 565                          * 2009-07-13 17:49:27.000000000 +0200
 566                          * we don't show fractional seconds.
 567                          */
 568                         char buf[sizeof("YYYY-mm-dd HH:MM:SS TIMEZONE")];
 569                         strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S %z",
 570                                         localtime(&dn->dn_time));
 571                         column += printf("%s ", buf);
 572                 } else { /* ordinary time format */
 573                         /* G.current_time_t is ~== time(NULL) */
 574                         char *filetime = ctime(&dn->dn_time);
 575                         /* filetime's format: "Wed Jun 30 21:49:08 1993\n" */
 576                         time_t age = G.current_time_t - dn->dn_time;
 577                         if (age < 3600L * 24 * 365 / 2 && age > -15 * 60) {
 578                                 /* less than 6 months old */
 579                                 /* "mmm dd hh:mm " */
 580                                 printf("%.12s ", filetime + 4);
 581                         } else {
 582                                 /* "mmm dd  yyyy " */
 583                                 /* "mmm dd yyyyy " after year 9999 :) */
 584                                 strchr(filetime + 20, '\n')[0] = ' ';
 585                                 printf("%.7s%6s", filetime + 4, filetime + 20);
 586                         }
 587                         column += 13;
 588                 }
 589 #endif
 590         }
 591
 592 #if ENABLE_FEATURE_LS_COLOR
 593         if (G_show_color) {
 594                 mode_t mode = dn->dn_mode_lstat;
 595                 if (!mode)
 596                         if (lstat(dn->fullname, &statbuf) == 0)
 597                                 mode = statbuf.st_mode;
 598                 printf(ESC"[%u;%um", bold(mode), fgcolor(mode));
 599         }
 600 #endif
 601         column += print_name(dn->name);
 602         if (G_show_color) {
 603                 printf(ESC"[m");
 604         }
 605
 606         if (lpath) {
 607                 printf(" -> ");
 608 #if ENABLE_FEATURE_LS_FILETYPES || ENABLE_FEATURE_LS_COLOR
 609                 if ((opt & (OPT_F|OPT_p))
 610                  || G_show_color
 611                 ) {
 612                         mode_t mode = dn->dn_mode_stat;
 613                         if (!mode)
 614                                 if (stat(dn->fullname, &statbuf) == 0)
 615                                         mode = statbuf.st_mode;
 616 # if ENABLE_FEATURE_LS_FILETYPES
 617                         append = append_char(mode);
 618 # endif
 619 # if ENABLE_FEATURE_LS_COLOR
 620                         if (G_show_color) {
 621                                 printf(ESC"[%u;%um", bold(mode), fgcolor(mode));
 622                         }
 623 # endif
 624                 }
 625 #endif
 626                 column += print_name(lpath) + 4;
 627                 free(lpath);
 628                 if (G_show_color) {
 629                         printf(ESC"[m");
 630                 }
 631         }
 632 #if ENABLE_FEATURE_LS_FILETYPES
 633         if (opt & (OPT_F|OPT_p)) {
 634                 if (append) {
 635                         putchar(append);
 636                         column++;
 637                 }
 638         }
 639 #endif
 640
 641         return column;
 642 }
 643
 644 static void display_files(struct dnode **dn, unsigned nfiles)
 645 {
 646         unsigned i, ncols, nrows, row, nc;
 647         unsigned column;
 648         unsigned nexttab;
 649         unsigned column_width = 0; /* used only by coulmnal output */
 650
 651         if (option_mask32 & (OPT_l|OPT_1)) {
 652                 ncols = 1;
 653         } else {
 654                 /* find the longest file name, use that as the column width */
 655                 for (i = 0; dn[i]; i++) {
 656                         int len = calc_name_len(dn[i]->name);
 657                         if (column_width < len)
 658                                 column_width = len;
 659                 }
 660                 column_width += 2
 661                         + ((option_mask32 & OPT_Z) ? 33 : 0) /* context width */
 662                         + ((option_mask32 & OPT_i) ? 8 : 0) /* inode# width */
 663                         + ((option_mask32 & OPT_s) ? 5 : 0) /* "alloc block" width */
 664                 ;
 665                 ncols = (unsigned)G_terminal_width / column_width;
 666         }
 667
 668         if (ncols > 1) {
 669                 nrows = nfiles / ncols;
 670                 if (nrows * ncols < nfiles)
 671                         nrows++;                /* round up fractionals */
 672         } else {
 673                 nrows = nfiles;
 674                 ncols = 1;
 675         }
 676
 677         column = 0;
 678         nexttab = 0;
 679         for (row = 0; row < nrows; row++) {
 680                 for (nc = 0; nc < ncols; nc++) {
 681                         /* reach into the array based on the column and row */
 682                         if (option_mask32 & OPT_x)
 683                                 i = (row * ncols) + nc; /* display across row */
 684                         else
 685                                 i = (nc * nrows) + row; /* display by column */
 686                         if (i < nfiles) {
 687                                 if (column > 0) {
 688                                         nexttab -= column;
 689                                         printf("%*s", nexttab, "");
 690                                         column += nexttab;
 691                                 }
 692                                 nexttab = column + column_width;
 693                                 column += display_single(dn[i]);
 694                         }
 695                 }
 696                 putchar('\n');
 697                 column = 0;
 698         }
 699 }
 700
 701
 702 /*** Dir scanning code ***/
 703
 704 static struct dnode *my_stat(const char *fullname, const char *name, int force_follow)
 705 {
 706         struct stat statbuf;
 707         struct dnode *cur;
 708
 709         cur = xzalloc(sizeof(*cur));
 710         cur->fullname = fullname;
 711         cur->name = name;
 712
 713         if ((option_mask32 & OPT_L) || force_follow) {
 714 #if ENABLE_SELINUX
 715                 if (option_mask32 & OPT_Z) {
 716                         getfilecon(fullname, &cur->sid);
 717                 }
 718 #endif
 719                 if (stat(fullname, &statbuf)) {
 720                         bb_simple_perror_msg(fullname);
 721                         G.exit_code = EXIT_FAILURE;
 722                         free(cur);
 723                         return NULL;
 724                 }
 725                 cur->dn_mode_stat = statbuf.st_mode;
 726         } else {
 727 #if ENABLE_SELINUX
 728                 if (option_mask32 & OPT_Z) {
 729                         lgetfilecon(fullname, &cur->sid);
 730                 }
 731 #endif
 732                 if (lstat(fullname, &statbuf)) {
 733                         bb_simple_perror_msg(fullname);
 734                         G.exit_code = EXIT_FAILURE;
 735                         free(cur);
 736                         return NULL;
 737                 }
 738                 cur->dn_mode_lstat = statbuf.st_mode;
 739         }
 740
 741         /* cur->dstat = statbuf: */
 742         cur->dn_mode   = statbuf.st_mode  ;
 743         cur->dn_size   = statbuf.st_size  ;
 744 #if ENABLE_FEATURE_LS_TIMESTAMPS || ENABLE_FEATURE_LS_SORTFILES
 745         cur->dn_time   = statbuf.st_mtime ;
 746         if (option_mask32 & OPT_u)
 747                 cur->dn_time = statbuf.st_atime;
 748         if (option_mask32 & OPT_c)
 749                 cur->dn_time = statbuf.st_ctime;
 750 #endif
 751         cur->dn_ino    = statbuf.st_ino   ;
 752         cur->dn_blocks = statbuf.st_blocks;
 753         cur->dn_nlink  = statbuf.st_nlink ;
 754         cur->dn_uid    = statbuf.st_uid   ;
 755         cur->dn_gid    = statbuf.st_gid   ;
 756         cur->dn_rdev_maj = major(statbuf.st_rdev);
 757         cur->dn_rdev_min = minor(statbuf.st_rdev);
 758
 759         return cur;
 760 }
 761
 762 static unsigned count_dirs(struct dnode **dn, int which)
 763 {
 764         unsigned dirs, all;
 765
 766         if (!dn)
 767                 return 0;
 768
 769         dirs = all = 0;
 770         for (; *dn; dn++) {
 771                 const char *name;
 772
 773                 all++;
 774                 if (!S_ISDIR((*dn)->dn_mode))
 775                         continue;
 776
 777                 name = (*dn)->name;
 778                 if (which != SPLIT_SUBDIR /* if not requested to skip . / .. */
 779                  /* or if it's not . or .. */
 780                  || name[0] != '.'
 781                  || (name[1] && (name[1] != '.' || name[2]))
 782                 ) {
 783                         dirs++;
 784                 }
 785         }
 786         return which != SPLIT_FILE ? dirs : all - dirs;
 787 }
 788
 789 /* get memory to hold an array of pointers */
 790 static struct dnode **dnalloc(unsigned num)
 791 {
 792         if (num < 1)
 793                 return NULL;
 794
 795         num++; /* so that we have terminating NULL */
 796         return xzalloc(num * sizeof(struct dnode *));
 797 }
 798
 799 #if ENABLE_FEATURE_LS_RECURSIVE
 800 static void dfree(struct dnode **dnp)
 801 {
 802         unsigned i;
 803
 804         if (dnp == NULL)
 805                 return;
 806
 807         for (i = 0; dnp[i]; i++) {
 808                 struct dnode *cur = dnp[i];
 809                 if (cur->fname_allocated)
 810                         free((char*)cur->fullname);
 811                 free(cur);
 812         }
 813         free(dnp);
 814 }
 815 #else
 816 #define dfree(...) ((void)0)
 817 #endif
 818
 819 /* Returns NULL-terminated malloced vector of pointers (or NULL) */
 820 static struct dnode **splitdnarray(struct dnode **dn, int which)
 821 {
 822         unsigned dncnt, d;
 823         struct dnode **dnp;
 824
 825         if (dn == NULL)
 826                 return NULL;
 827
 828         /* count how many dirs or files there are */
 829         dncnt = count_dirs(dn, which);
 830
 831         /* allocate a file array and a dir array */
 832         dnp = dnalloc(dncnt);
 833
 834         /* copy the entrys into the file or dir array */
 835         for (d = 0; *dn; dn++) {
 836                 if (S_ISDIR((*dn)->dn_mode)) {
 837                         const char *name;
 838
 839                         if (which == SPLIT_FILE)
 840                                 continue;
 841
 842                         name = (*dn)->name;
 843                         if ((which & SPLIT_DIR) /* any dir... */
 844                         /* ... or not . or .. */
 845                          || name[0] != '.'
 846                          || (name[1] && (name[1] != '.' || name[2]))
 847                         ) {
 848                                 dnp[d++] = *dn;
 849                         }
 850                 } else
 851                 if (which == SPLIT_FILE) {
 852                         dnp[d++] = *dn;
 853                 }
 854         }
 855         return dnp;
 856 }
 857
 858 #if ENABLE_FEATURE_LS_SORTFILES
 859 static int sortcmp(const void *a, const void *b)
 860 {
 861         struct dnode *d1 = *(struct dnode **)a;
 862         struct dnode *d2 = *(struct dnode **)b;
 863         unsigned opt = option_mask32;
 864         off_t dif;
 865
 866         dif = 0; /* assume sort by name */
 867         // TODO: use pre-initialized function pointer
 868         // instead of branch forest
 869         if (opt & OPT_dirs_first) {
 870                 dif = S_ISDIR(d2->dn_mode) - S_ISDIR(d1->dn_mode);
 871                 if (dif != 0)
 872                         goto maybe_invert_and_ret;
 873         }
 874
 875         if (opt & OPT_S) { /* sort by size */
 876                 dif = (d2->dn_size - d1->dn_size);
 877         } else
 878         if (opt & OPT_t) { /* sort by time */
 879                 dif = (d2->dn_time - d1->dn_time);
 880         } else
 881 #if defined(HAVE_STRVERSCMP) && HAVE_STRVERSCMP == 1
 882         if (opt & OPT_v) { /* sort by version */
 883                 dif = strverscmp(d1->name, d2->name);
 884         } else
 885 #endif
 886         if (opt & OPT_X) { /* sort by extension */
 887                 dif = strcmp(strchrnul(d1->name, '.'), strchrnul(d2->name, '.'));
 888         }
 889         if (dif == 0) {
 890                 /* sort by name, use as tie breaker for other sorts */
 891                 if (ENABLE_LOCALE_SUPPORT)
 892                         dif = strcoll(d1->name, d2->name);
 893                 else
 894                         dif = strcmp(d1->name, d2->name);
 895         } else {
 896                 /* Make dif fit into an int */
 897                 if (sizeof(dif) > sizeof(int)) {
 898                         enum { BITS_TO_SHIFT = 8 * (sizeof(dif) - sizeof(int)) };
 899                         /* shift leaving only "int" worth of bits */
 900                         /* (this requires dif != 0, and here it is nonzero) */
 901                         dif = 1 | (int)((uoff_t)dif >> BITS_TO_SHIFT);
 902                 }
 903         }
 904  maybe_invert_and_ret:
 905         return (opt & OPT_r) ? -(int)dif : (int)dif;
 906 }
 907
 908 static void dnsort(struct dnode **dn, int size)
 909 {
 910         qsort(dn, size, sizeof(*dn), sortcmp);
 911 }
 912
 913 static void sort_and_display_files(struct dnode **dn, unsigned nfiles)
 914 {
 915         dnsort(dn, nfiles);
 916         display_files(dn, nfiles);
 917 }
 918 #else
 919 # define dnsort(dn, size) ((void)0)
 920 # define sort_and_display_files(dn, nfiles) display_files(dn, nfiles)
 921 #endif
 922
 923 /* Returns NULL-terminated malloced vector of pointers (or NULL) */
 924 static struct dnode **scan_one_dir(const char *path, unsigned *nfiles_p)
 925 {
 926         struct dnode *dn, *cur, **dnp;
 927         struct dirent *entry;
 928         DIR *dir;
 929         unsigned i, nfiles;
 930
 931         *nfiles_p = 0;
 932         dir = warn_opendir(path);
 933         if (dir == NULL) {
 934                 G.exit_code = EXIT_FAILURE;
 935                 return NULL;    /* could not open the dir */
 936         }
 937         dn = NULL;
 938         nfiles = 0;
 939         while ((entry = readdir(dir)) != NULL) {
 940                 char *fullname;
 941
 942                 /* are we going to list the file- it may be . or .. or a hidden file */
 943                 if (entry->d_name[0] == '.') {
 944                         if (!(option_mask32 & (OPT_a|OPT_A)))
 945                                 continue; /* skip all dotfiles if no -a/-A */
 946                         if (!(option_mask32 & OPT_a)
 947                          && (!entry->d_name[1] || (entry->d_name[1] == '.' && !entry->d_name[2]))
 948                         ) {
 949                                 continue; /* if only -A, skip . and .. but show other dotfiles */
 950                         }
 951                 }
 952                 fullname = concat_path_file(path, entry->d_name);
 953                 cur = my_stat(fullname, bb_basename(fullname), 0);
 954                 if (!cur) {
 955                         free(fullname);
 956                         continue;
 957                 }
 958                 cur->fname_allocated = 1;
 959                 cur->dn_next = dn;
 960                 dn = cur;
 961                 nfiles++;
 962         }
 963         closedir(dir);
 964
 965         if (dn == NULL)
 966                 return NULL;
 967
 968         /* now that we know how many files there are
 969          * allocate memory for an array to hold dnode pointers
 970          */
 971         *nfiles_p = nfiles;
 972         dnp = dnalloc(nfiles);
 973         for (i = 0; /* i < nfiles - detected via !dn below */; i++) {
 974                 dnp[i] = dn;    /* save pointer to node in array */
 975                 dn = dn->dn_next;
 976                 if (!dn)
 977                         break;
 978         }
 979
 980         return dnp;
 981 }
 982
 983 #if ENABLE_DESKTOP
 984 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/ls.html
 985  * If any of the -l, -n, -s options is specified, each list
 986  * of files within the directory shall be preceded by a
 987  * status line indicating the number of file system blocks
 988  * occupied by files in the directory in 512-byte units if
 989  * the -k option is not specified, or 1024-byte units if the
 990  * -k option is specified, rounded up to the next integral
 991  * number of units.
 992  */
 993 /* by Jorgen Overgaard (jorgen AT antistaten.se) */
 994 static off_t calculate_blocks(struct dnode **dn)
 995 {
 996         uoff_t blocks = 1;
 997         if (dn) {
 998                 while (*dn) {
 999                         /* st_blocks is in 512 byte blocks */
1000                         blocks += (*dn)->dn_blocks;
1001                         dn++;
1002                 }
1003         }
1004
1005         /* Even though standard says use 512 byte blocks, coreutils use 1k */
1006         /* Actually, we round up by calculating (blocks + 1) / 2,
1007          * "+ 1" was done when we initialized blocks to 1 */
1008         return blocks >> 1;
1009 }
1010 #endif
1011
1012 static void scan_and_display_dirs_recur(struct dnode **dn, int first)
1013 {
1014         unsigned nfiles;
1015         struct dnode **subdnp;
1016
1017         for (; *dn; dn++) {
1018                 if (G.show_dirname || (option_mask32 & OPT_R)) {
1019                         if (!first)
1020                                 bb_putchar('\n');
1021                         first = 0;
1022                         printf("%s:\n", (*dn)->fullname);
1023                 }
1024                 subdnp = scan_one_dir((*dn)->fullname, &nfiles);
1025 #if ENABLE_DESKTOP
1026                 if (option_mask32 & (OPT_s|OPT_l)) {
1027                         if (option_mask32 & OPT_h) {
1028                                 printf("total %-"HUMAN_READABLE_MAX_WIDTH_STR"s\n",
1029                                         /* print size, no fractions, use suffixes */
1030                                         make_human_readable_str(calculate_blocks(subdnp) * 1024,
1031                                                                 0, 0)
1032                                 );
1033                         } else {
1034                                 printf("total %"OFF_FMT"u\n", calculate_blocks(subdnp));
1035                         }
1036                 }
1037 #endif
1038                 if (nfiles > 0) {
1039                         /* list all files at this level */
1040                         sort_and_display_files(subdnp, nfiles);
1041
1042                         if (ENABLE_FEATURE_LS_RECURSIVE
1043                          && (option_mask32 & OPT_R)
1044                         ) {
1045                                 struct dnode **dnd;
1046                                 unsigned dndirs;
1047                                 /* recursive - list the sub-dirs */
1048                                 dnd = splitdnarray(subdnp, SPLIT_SUBDIR);
1049                                 dndirs = count_dirs(subdnp, SPLIT_SUBDIR);
1050                                 if (dndirs > 0) {
1051                                         dnsort(dnd, dndirs);
1052                                         scan_and_display_dirs_recur(dnd, 0);
1053                                         /* free the array of dnode pointers to the dirs */
1054                                         free(dnd);
1055                                 }
1056                         }
1057                         /* free the dnodes and the fullname mem */
1058                         dfree(subdnp);
1059                 }
1060         }
1061 }
1062
1063
1064 int ls_main(int argc UNUSED_PARAM, char **argv)
1065 {       /*      ^^^^^^^^^^^^^^^^^ note: if FTPD, argc can be wrong, see ftpd.c */
1066         struct dnode **dnd;
1067         struct dnode **dnf;
1068         struct dnode **dnp;
1069         struct dnode *dn;
1070         struct dnode *cur;
1071         unsigned opt;
1072         unsigned nfiles;
1073         unsigned dnfiles;
1074         unsigned dndirs;
1075         unsigned i;
1076 #if ENABLE_FEATURE_LS_COLOR
1077         /* colored LS support by JaWi, janwillem.janssen@lxtreme.nl */
1078         /* coreutils 6.10:
1079          * # ls --color=BOGUS
1080          * ls: invalid argument 'BOGUS' for '--color'
1081          * Valid arguments are:
1082          * 'always', 'yes', 'force'
1083          * 'never', 'no', 'none'
1084          * 'auto', 'tty', 'if-tty'
1085          * (and substrings: "--color=alwa" work too)
1086          */
1087         static const char color_str[] ALIGN1 =
1088                 "always\0""yes\0""force\0"
1089                 "auto\0""tty\0""if-tty\0";
1090         /* need to initialize since --color has _an optional_ argument */
1091         const char *color_opt = color_str; /* "always" */
1092 #endif
1093 #if ENABLE_LONG_OPTS
1094         static const char ls_longopts[] ALIGN1 =
1095                 "full-time\0" No_argument "\xff"
1096                 "group-directories-first\0" No_argument "\xfe"
1097                 IF_FEATURE_LS_COLOR("color\0" Optional_argument "\xfd")
1098         ;
1099 #endif
1100
1101         INIT_G();
1102
1103         init_unicode();
1104
1105 #if ENABLE_FEATURE_LS_WIDTH
1106         /* obtain the terminal width */
1107         G_terminal_width = get_terminal_width(STDIN_FILENO);
1108         /* go one less... */
1109         G_terminal_width--;
1110 #endif
1111
1112         /* process options */
1113         opt = getopt32long(argv, "^"
1114                 ls_options
1115                         "\0"
1116                         /* -n and -g imply -l */
1117                         "nl:gl"
1118                         /* --full-time implies -l */
1119                         IF_FEATURE_LS_TIMESTAMPS(IF_LONG_OPTS(":\xff""l"))
1120                         /* http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html:
1121                          * in some pairs of opts, only last one takes effect:
1122                          */
1123                         IF_FEATURE_LS_TIMESTAMPS(IF_FEATURE_LS_SORTFILES(":t-S:S-t")) /* time/size */
1124                         // ":m-l:l-m" - we don't have -m
1125                         IF_FEATURE_LS_FOLLOWLINKS(":H-L:L-H")
1126                         ":C-xl:x-Cl:l-xC" /* bycols/bylines/long */
1127                         ":C-1:1-C" /* bycols/oneline */
1128                         ":x-1:1-x" /* bylines/oneline (not in SuS, but in GNU coreutils 8.4) */
1129                         IF_FEATURE_LS_TIMESTAMPS(":c-u:u-c") /* mtime/atime */
1130                         /* -w NUM: */
1131                         IF_FEATURE_LS_WIDTH(":w+")
1132                 , ls_longopts
1133                 IF_FEATURE_LS_WIDTH(, /*-T*/ NULL, /*-w*/ &G_terminal_width)
1134                 IF_FEATURE_LS_COLOR(, &color_opt)
1135         );
1136 #if 0 /* option bits debug */
1137         bb_error_msg("opt:0x%08x l:%x H:%x color:%x dirs:%x", opt, OPT_l, OPT_H, OPT_color, OPT_dirs_first);
1138         if (opt & OPT_c         ) bb_error_msg("-c");
1139         if (opt & OPT_l         ) bb_error_msg("-l");
1140         if (opt & OPT_H         ) bb_error_msg("-H");
1141         if (opt & OPT_color     ) bb_error_msg("--color");
1142         if (opt & OPT_dirs_first) bb_error_msg("--group-directories-first");
1143         if (opt & OPT_full_time ) bb_error_msg("--full-time");
1144         exit(0);
1145 #endif
1146
1147 #if ENABLE_SELINUX
1148         if (opt & OPT_Z) {
1149                 if (!is_selinux_enabled())
1150                         option_mask32 &= ~OPT_Z;
1151         }
1152 #endif
1153
1154 #if ENABLE_FEATURE_LS_COLOR
1155         /* set G_show_color = 1/0 */
1156         if (ENABLE_FEATURE_LS_COLOR_IS_DEFAULT && !is_TERM_dumb()) {
1157                 char *p = getenv("LS_COLORS");
1158                 /* LS_COLORS is unset, or (not empty && not "none") ? */
1159                 if (!p || (p[0] && strcmp(p, "none") != 0)) {
1160                         if (isatty(STDOUT_FILENO)) {
1161                                 /* check isatty() last because it's expensive (syscall) */
1162                                 G_show_color = 1;
1163                         }
1164                 }
1165         }
1166         if (opt & OPT_color) {
1167                 if (color_opt[0] == 'n')
1168                         G_show_color = 0;
1169                 else switch (index_in_substrings(color_str, color_opt)) {
1170                 case 3:
1171                 case 4:
1172                 case 5:
1173                         if (!is_TERM_dumb() && isatty(STDOUT_FILENO)) {
1174                 case 0:
1175                 case 1:
1176                 case 2:
1177                                 G_show_color = 1;
1178                         }
1179                 }
1180         }
1181 #endif
1182
1183         /* sort out which command line options take precedence */
1184         if (ENABLE_FEATURE_LS_RECURSIVE && (opt & OPT_d))
1185                 option_mask32 &= ~OPT_R;        /* no recurse if listing only dir */
1186         if (!(opt & OPT_l)) { /* not -l? */
1187                 if (ENABLE_FEATURE_LS_TIMESTAMPS && ENABLE_FEATURE_LS_SORTFILES) {
1188                         /* when to sort by time? -t[cu] sorts by time even with -l */
1189                         /* (this is achieved by opt_flags[] element for -t) */
1190                         /* without -l, bare -c or -u enable sort too */
1191                         /* (with -l, bare -c or -u just select which time to show) */
1192                         if (opt & (OPT_c|OPT_u)) {
1193                                 option_mask32 |= OPT_t;
1194                         }
1195                 }
1196         }
1197
1198         /* choose a display format if one was not already specified by an option */
1199         if (!(option_mask32 & (OPT_l|OPT_1|OPT_x|OPT_C)))
1200                 option_mask32 |= (isatty(STDOUT_FILENO) ? OPT_C : OPT_1);
1201
1202         if (ENABLE_FTPD && applet_name[0] == 'f') {
1203                 /* ftpd secret backdoor. dirs first are much nicer */
1204                 option_mask32 |= OPT_dirs_first;
1205         }
1206
1207         argv += optind;
1208         if (!argv[0])
1209                 *--argv = (char*)".";
1210
1211         if (argv[1])
1212                 G.show_dirname = 1; /* 2 or more items? label directories */
1213
1214         /* stuff the command line file names into a dnode array */
1215         dn = NULL;
1216         nfiles = 0;
1217         do {
1218                 cur = my_stat(*argv, *argv,
1219                         /* follow links on command line unless -l, -i, -s or -F: */
1220                         !(option_mask32 & (OPT_l|OPT_i|OPT_s|OPT_F))
1221                         /* ... or if -H: */
1222                         || (option_mask32 & OPT_H)
1223                         /* ... or if -L, but my_stat always follows links if -L */
1224                 );
1225                 argv++;
1226                 if (!cur)
1227                         continue;
1228                 /*cur->fname_allocated = 0; - already is */
1229                 cur->dn_next = dn;
1230                 dn = cur;
1231                 nfiles++;
1232         } while (*argv);
1233
1234         /* nfiles _may_ be 0 here - try "ls doesnt_exist" */
1235         if (nfiles == 0)
1236                 return G.exit_code;
1237
1238         /* now that we know how many files there are
1239          * allocate memory for an array to hold dnode pointers
1240          */
1241         dnp = dnalloc(nfiles);
1242         for (i = 0; /* i < nfiles - detected via !dn below */; i++) {
1243                 dnp[i] = dn;    /* save pointer to node in array */
1244                 dn = dn->dn_next;
1245                 if (!dn)
1246                         break;
1247         }
1248
1249         if (option_mask32 & OPT_d) {
1250                 sort_and_display_files(dnp, nfiles);
1251         } else {
1252                 dnd = splitdnarray(dnp, SPLIT_DIR);
1253                 dnf = splitdnarray(dnp, SPLIT_FILE);
1254                 dndirs = count_dirs(dnp, SPLIT_DIR);
1255                 dnfiles = nfiles - dndirs;
1256                 if (dnfiles > 0) {
1257                         sort_and_display_files(dnf, dnfiles);
1258                         if (ENABLE_FEATURE_CLEAN_UP)
1259                                 free(dnf);
1260                 }
1261                 if (dndirs > 0) {
1262                         dnsort(dnd, dndirs);
1263                         scan_and_display_dirs_recur(dnd, dnfiles == 0);
1264                         if (ENABLE_FEATURE_CLEAN_UP)
1265                                 free(dnd);
1266                 }
1267         }
1268
1269         if (ENABLE_FEATURE_CLEAN_UP)
1270                 dfree(dnp);
1271         return G.exit_code;
1272 }