/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1989, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Michael Fischbein.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mac.h>

#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <getopt.h>
#include <grp.h>
#include <inttypes.h>
#include <limits.h>
#include <locale.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef COLORLS
#include <termcap.h>
#include <signal.h>
#endif

#include "ls.h"
#include "extern.h"

/*
 * Upward approximation of the maximum number of characters needed to
 * represent a value of integral type t as a string, excluding the
 * NUL terminator, with provision for a sign.
 */
#define STRBUF_SIZEOF(t)        (1 + CHAR_BIT * sizeof(t) / 3 + 1)

/*
 * MAKENINES(n) turns n into (10**n)-1.  This is useful for converting a width
 * into a number that wide in decimal.
 * XXX: Overflows are not considered.
 */
#define MAKENINES(n)                                                    \
        do {                                                            \
                intmax_t __i;                                           \
                                                                        \
                /* Use a loop as all values of n are small. */          \
                for (__i = 1; n > 0; __i *= 10)                         \
                        n--;                                            \
                n = __i - 1;                                            \
        } while(0)

static void      display(const FTSENT *, FTSENT *, int);
static int       mastercmp(const FTSENT * const *, const FTSENT * const *);
static void      traverse(int, char **, int);

enum {
        GRP_NONE = 0,
        GRP_DIR_FIRST = -1,
        GRP_DIR_LAST = 1
};

enum {
        BIN_OPT = CHAR_MAX,
        COLOR_OPT,
        GROUP_OPT
};

static const struct option long_opts[] =
{
        {"color",        optional_argument,      NULL, COLOR_OPT},
        {"group-directories", optional_argument, NULL, GROUP_OPT},
        {"group-directories-first", no_argument, NULL, GROUP_OPT},
        {NULL,           no_argument,            NULL, 0}
};

static void (*printfcn)(const DISPLAY *);
static int (*sortfcn)(const FTSENT *, const FTSENT *);

long blocksize;                 /* block size units */
int termwidth = 80;             /* default terminal width */

/* flags */
       int f_accesstime;        /* use time of last access */
       int f_birthtime;         /* use time of birth */
       int f_flags;             /* show flags associated with a file */
static int f_groupdir = GRP_NONE;/* group directories first/last */
       int f_humanval;          /* show human-readable file sizes */
       int f_inode;             /* print inode */
static int f_kblocks;           /* print size in kilobytes */
       int f_label;             /* show MAC label */
static int f_listdir;           /* list actual directory, not contents */
static int f_listdot;           /* list files beginning with . */
       int f_longform;          /* long listing format */
static int f_noautodot;         /* do not automatically enable -A for root */
static int f_nofollow;          /* don't follow symbolic link arguments */
       int f_nonprint;          /* show unprintables as ? */
static int f_nosort;            /* don't sort output */
       int f_notabs;            /* don't use tab-separated multi-col output */
static int f_numericonly;       /* don't convert uid/gid to name */
       int f_octal;             /* show unprintables as \xxx */
       int f_octal_escape;      /* like f_octal but use C escapes if possible */
static int f_recursive;         /* ls subdirectories also */
static int f_reversesort;       /* reverse whatever sort is used */
static int f_verssort;          /* sort names using strverscmp(3) rather than strcoll(3) */
       int f_samesort;          /* sort time and name in same direction */
       int f_sectime;           /* print full time information */
static int f_singlecol;         /* use single column output */
       int f_size;              /* list size in short listing */
static int f_sizesort;
       int f_slash;             /* similar to f_type, but only for dirs */
       int f_sortacross;        /* sort across rows, not down columns */
       int f_sowner;            /* disable showing owner's name */
       int f_statustime;        /* use time of last mode change */
static int f_stream;            /* stream the output, separate with commas */
       int f_thousands;         /* show file sizes with thousands separators */
       char *f_timeformat;      /* user-specified time format */
static int f_timesort;          /* sort by time vice name */
       int f_type;              /* add type character for non-regular files */
static int f_whiteout;          /* show whiteout entries */
#ifdef COLORLS
       int colorflag = COLORFLAG_NEVER;         /* passed in colorflag */
       int f_color;             /* add type in color for non-regular files */
       bool explicitansi;       /* Explicit ANSI sequences, no termcap(5) */
char *ansi_bgcol;               /* ANSI sequence to set background colour */
char *ansi_fgcol;               /* ANSI sequence to set foreground colour */
char *ansi_coloff;              /* ANSI sequence to reset colours */
char *attrs_off;                /* ANSI sequence to turn off attributes */
char *enter_bold;               /* ANSI sequence to set color to bold mode */
char *enter_underline;          /* ANSI sequence to enter underline mode */
#endif

static int rval;

static bool
do_color_from_env(void)
{
        const char *p;
        bool doit;

        doit = false;
        p = getenv("CLICOLOR");
        if (p == NULL) {
                /*
                 * COLORTERM is the more standard name for this variable.  We'll
                 * honor it as long as it's both set and not empty.
                 */
                p = getenv("COLORTERM");
                if (p != NULL && *p != '\0')
                        doit = true;
        } else
                doit = true;

        return (doit &&
            (isatty(STDOUT_FILENO) || getenv("CLICOLOR_FORCE")));
}

static bool
do_color(void)
{

#ifdef COLORLS
        if (colorflag == COLORFLAG_NEVER)
                return (false);
        else if (colorflag == COLORFLAG_ALWAYS)
                return (true);
#endif
        return (do_color_from_env());
}

#ifdef COLORLS
static bool
do_color_always(const char *term)
{

        return (strcmp(term, "always") == 0 || strcmp(term, "yes") == 0 ||
            strcmp(term, "force") == 0);
}

static bool
do_color_never(const char *term)
{

        return (strcmp(term, "never") == 0 || strcmp(term, "no") == 0 ||
            strcmp(term, "none") == 0);
}

static bool
do_color_auto(const char *term)
{

        return (strcmp(term, "auto") == 0 || strcmp(term, "tty") == 0 ||
            strcmp(term, "if-tty") == 0);
}
#endif  /* COLORLS */

int
main(int argc, char *argv[])
{
        static char dot[] = ".", *dotav[] = {dot, NULL};
        struct winsize win;
        int ch, fts_options, notused;
        char *p;
        const char *errstr = NULL;
#ifdef COLORLS
        char termcapbuf[1024];  /* termcap definition buffer */
        char tcapbuf[512];      /* capability buffer */
        char *bp = tcapbuf, *term;
#endif

        (void)setlocale(LC_ALL, "");

        /* Terminal defaults to -Cq, non-terminal defaults to -1. */
        if (isatty(STDOUT_FILENO)) {
                termwidth = 80;
                if ((p = getenv("COLUMNS")) != NULL && *p != '\0')
                        termwidth = strtonum(p, 0, INT_MAX, &errstr);
                else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) != -1 &&
                    win.ws_col > 0)
                        termwidth = win.ws_col;
                f_nonprint = 1;
        } else {
                f_singlecol = 1;
                /* retrieve environment variable, in case of explicit -C */
                p = getenv("COLUMNS");
                if (p)
                        termwidth = strtonum(p, 0, INT_MAX, &errstr);
        }

        if (errstr)
                termwidth = 80;

        fts_options = FTS_PHYSICAL;
        if (getenv("LS_SAMESORT"))
                f_samesort = 1;

        /*
         * For historical compatibility, we'll use our autodetection if CLICOLOR
         * is set.
         */
#ifdef COLORLS
        if (getenv("CLICOLOR"))
                colorflag = COLORFLAG_AUTO;
#endif
        while ((ch = getopt_long(argc, argv,
            "+1ABCD:FGHILPRSTUWXZabcdfghiklmnopqrstuvwxy,", long_opts,
            NULL)) != -1) {
                switch (ch) {
                /*
                 * The -1, -C, -x and -l options all override each other so
                 * shell aliasing works right.
                 */
                case '1':
                        f_singlecol = 1;
                        f_longform = 0;
                        f_stream = 0;
                        break;
                case 'C':
                        f_sortacross = f_longform = f_singlecol = 0;
                        break;
                case 'l':
                        f_longform = 1;
                        f_singlecol = 0;
                        f_stream = 0;
                        break;
                case 'x':
                        f_sortacross = 1;
                        f_longform = 0;
                        f_singlecol = 0;
                        break;
                /* The -c, -u, and -U options override each other. */
                case 'c':
                        f_statustime = 1;
                        f_accesstime = 0;
                        f_birthtime = 0;
                        break;
                case 'u':
                        f_accesstime = 1;
                        f_statustime = 0;
                        f_birthtime = 0;
                        break;
                case 'U':
                        f_birthtime = 1;
                        f_accesstime = 0;
                        f_statustime = 0;
                        break;
                case 'f':
                        f_nosort = 1;
                       /* FALLTHROUGH */
                case 'a':
                        fts_options |= FTS_SEEDOT;
                        /* FALLTHROUGH */
                case 'A':
                        f_listdot = 1;
                        break;
                /* The -S, -t and -v options override each other. */
                case 'S':
                        f_sizesort = 1;
                        f_timesort = 0;
                        f_verssort = 0;
                        break;
                case 't':
                        f_timesort = 1;
                        f_sizesort = 0;
                        f_verssort = 0;
                        break;
                case 'v':
                        f_verssort = 1;
                        f_sizesort = 0;
                        f_timesort = 0;
                        break;
                /* Other flags.  Please keep alphabetic. */
                case ',':
                        f_thousands = 1;
                        break;
                case 'B':
                        f_nonprint = 0;
                        f_octal = 1;
                        f_octal_escape = 0;
                        break;
                case 'D':
                        f_timeformat = optarg;
                        break;
                case 'F':
                        f_type = 1;
                        f_slash = 0;
                        break;
                case 'G':
                        /*
                         * We both set CLICOLOR here and set colorflag to
                         * COLORFLAG_AUTO, because -G should not force color if
                         * stdout isn't a tty.
                         */
                        setenv("CLICOLOR", "", 1);
#ifdef COLORLS
                        colorflag = COLORFLAG_AUTO;
#endif
                        break;
                case 'H':
                        fts_options |= FTS_COMFOLLOW;
                        f_nofollow = 0;
                        break;
                case 'I':
                        f_noautodot = 1;
                        break;
                case 'L':
                        fts_options &= ~FTS_PHYSICAL;
                        fts_options |= FTS_LOGICAL;
                        f_nofollow = 0;
                        break;
                case 'P':
                        fts_options &= ~FTS_COMFOLLOW;
                        fts_options &= ~FTS_LOGICAL;
                        fts_options |= FTS_PHYSICAL;
                        f_nofollow = 1;
                        break;
                case 'R':
                        f_recursive = 1;
                        break;
                case 'T':
                        f_sectime = 1;
                        break;
                case 'W':
                        f_whiteout = 1;
                        break;
                case 'Z':
                        f_label = 1;
                        break;
                case 'b':
                        f_nonprint = 0;
                        f_octal = 0;
                        f_octal_escape = 1;
                        break;
                /* The -d option turns off the -R option. */
                case 'd':
                        f_listdir = 1;
                        f_recursive = 0;
                        break;
                case 'g':
                        f_longform = 1;
                        f_singlecol = 0;
                        f_stream = 0;
                        f_sowner = 1;
                        break;
                case 'h':
                        f_humanval = 1;
                        break;
                case 'i':
                        f_inode = 1;
                        break;
                case 'k':
                        f_humanval = 0;
                        f_kblocks = 1;
                        break;
                case 'm':
                        f_stream = 1;
                        f_singlecol = 0;
                        f_longform = 0;
                        break;
                case 'n':
                        f_numericonly = 1;
                        f_longform = 1;
                        f_singlecol = 0;
                        f_stream = 0;
                        break;
                case 'o':
                        f_flags = 1;
                        break;
                case 'p':
                        f_slash = 1;
                        f_type = 1;
                        break;
                case 'q':
                        f_nonprint = 1;
                        f_octal = 0;
                        f_octal_escape = 0;
                        break;
                case 'r':
                        f_reversesort = 1;
                        break;
                case 's':
                        f_size = 1;
                        break;
                case 'w':
                        f_nonprint = 0;
                        f_octal = 0;
                        f_octal_escape = 0;
                        break;
                case 'y':
                        f_samesort = 1;
                        break;
                case GROUP_OPT:
                        if (optarg == NULL || strcmp(optarg, "first") == 0)
                                f_groupdir = GRP_DIR_FIRST;
                        else if (strcmp(optarg, "last") == 0)
                                f_groupdir = GRP_DIR_LAST;
                        else
                                errx(2, "unsupported --group-directories value '%s' (must be first or last)",
                                    optarg);
                        break;
                case COLOR_OPT:
#ifdef COLORLS
                        if (optarg == NULL || do_color_always(optarg))
                                colorflag = COLORFLAG_ALWAYS;
                        else if (do_color_auto(optarg))
                                colorflag = COLORFLAG_AUTO;
                        else if (do_color_never(optarg))
                                colorflag = COLORFLAG_NEVER;
                        else
                                errx(2, "unsupported --color value '%s' (must be always, auto, or never)",
                                    optarg);
                        break;
#else
                        warnx("color support not compiled in");
#endif
                default:
                case '?':
                        usage();
                }
        }
        argc -= optind;
        argv += optind;

        /* Root is -A automatically unless -I. */
        if (!f_listdot && getuid() == (uid_t)0 && !f_noautodot)
                f_listdot = 1;

        /*
         * Enabling of colours is conditional on the environment in conjunction
         * with the --color and -G arguments, if supplied.
         */
        if (do_color()) {
#ifdef COLORLS
                if ((term = getenv("TERM")) != NULL &&
                    tgetent(termcapbuf, term) == 1) {
                        ansi_fgcol = tgetstr("AF", &bp);
                        ansi_bgcol = tgetstr("AB", &bp);
                        attrs_off = tgetstr("me", &bp);
                        enter_bold = tgetstr("md", &bp);
                        enter_underline = tgetstr("us", &bp);

                        /* To switch colours off use 'op' if
                         * available, otherwise use 'oc', or
                         * don't do colours at all. */
                        ansi_coloff = tgetstr("op", &bp);
                        if (!ansi_coloff)
                                ansi_coloff = tgetstr("oc", &bp);
                        if (ansi_fgcol && ansi_bgcol && ansi_coloff)
                                f_color = 1;
                } else if (colorflag == COLORFLAG_ALWAYS) {
                        /*
                         * If we're *always* doing color but we don't have
                         * a functional TERM supplied, we'll fallback to
                         * outputting raw ANSI sequences.
                         */
                        f_color = 1;
                        explicitansi = true;
                }
#endif /*COLORLS*/
        }

#ifdef COLORLS
        if (f_color) {
                /*
                 * We can't put tabs and color sequences together:
                 * column number will be incremented incorrectly
                 * for "stty oxtabs" mode.
                 */
                f_notabs = 1;
                (void)signal(SIGINT, colorquit);
                (void)signal(SIGQUIT, colorquit);
                parsecolors(getenv("LSCOLORS"));
        }
#endif

        /*
         * If not -F, -i, -l, -s, -S, -t or --group-directories options,
         * don't require stat information, unless in color mode in which case
         * we do need this to determine which colors to display.
         */
        if (!f_inode && !f_longform && !f_size && !f_timesort &&
            !f_sizesort && !f_type && f_groupdir == GRP_NONE
#ifdef COLORLS
            && !f_color
#endif
            )
                fts_options |= FTS_NOSTAT;

        /*
         * If not -F, -P, -d or -l options, follow any symbolic links listed on
         * the command line, unless in color mode in which case we need to
         * distinguish file type for a symbolic link itself and its target.
         */
        if (!f_nofollow && !f_longform && !f_listdir && (!f_type || f_slash)
#ifdef COLORLS
            && !f_color
#endif
            )
                fts_options |= FTS_COMFOLLOW;

        /*
         * If -W, show whiteout entries
         */
#ifdef FTS_WHITEOUT
        if (f_whiteout)
                fts_options |= FTS_WHITEOUT;
#endif

        /* If -i, -l or -s, figure out block size. */
        if (f_inode || f_longform || f_size) {
                if (f_kblocks)
                        blocksize = 2;
                else {
                        (void)getbsize(&notused, &blocksize);
                        blocksize /= 512;
                }
        }

        /* Select a sort function. */
        if (f_reversesort) {
                if (f_sizesort)
                        sortfcn = revsizecmp;
                else if (f_verssort)
                        sortfcn = revverscmp;
                else if (!f_timesort)
                        sortfcn = revnamecmp;
                else if (f_accesstime)
                        sortfcn = revacccmp;
                else if (f_birthtime)
                        sortfcn = revbirthcmp;
                else if (f_statustime)
                        sortfcn = revstatcmp;
                else            /* Use modification time. */
                        sortfcn = revmodcmp;
        } else {
                if (f_sizesort)
                        sortfcn = sizecmp;
                else if (f_verssort)
                        sortfcn = verscmp;
                else if (!f_timesort)
                        sortfcn = namecmp;
                else if (f_accesstime)
                        sortfcn = acccmp;
                else if (f_birthtime)
                        sortfcn = birthcmp;
                else if (f_statustime)
                        sortfcn = statcmp;
                else            /* Use modification time. */
                        sortfcn = modcmp;
        }

        /* Select a print function. */
        if (f_singlecol)
                printfcn = printscol;
        else if (f_longform)
                printfcn = printlong;
        else if (f_stream)
                printfcn = printstream;
        else
                printfcn = printcol;

        if (argc)
                traverse(argc, argv, fts_options);
        else
                traverse(1, dotav, fts_options);
        exit(rval);
}

static int output;              /* If anything output. */

/*
 * Traverse() walks the logical directory structure specified by the argv list
 * in the order specified by the mastercmp() comparison function.  During the
 * traversal it passes linked lists of structures to display() which represent
 * a superset (may be exact set) of the files to be displayed.
 */
static void
traverse(int argc, char *argv[], int options)
{
        FTS *ftsp;
        FTSENT *p, *chp;
        int ch_options;

        if ((ftsp =
            fts_open(argv, options, f_nosort ? NULL : mastercmp)) == NULL)
                err(1, "fts_open");

        /*
         * We ignore errors from fts_children here since they will be
         * replicated and signalled on the next call to fts_read() below.
         */
        chp = fts_children(ftsp, 0);
        if (chp != NULL)
                display(NULL, chp, options);
        if (f_listdir) {
                fts_close(ftsp);
                return;
        }

        /*
         * If not recursing down this tree and don't need stat info, just get
         * the names.
         */
        ch_options = !f_recursive && !f_label &&
            options & FTS_NOSTAT ? FTS_NAMEONLY : 0;

        while (errno = 0, (p = fts_read(ftsp)) != NULL)
                switch (p->fts_info) {
                case FTS_DC:
                        warnx("%s: directory causes a cycle", p->fts_name);
                        break;
                case FTS_DNR:
                case FTS_ERR:
                        warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
                        rval = 1;
                        break;
                case FTS_D:
                        if (p->fts_level != FTS_ROOTLEVEL &&
                            p->fts_name[0] == '.' && !f_listdot)
                                break;

                        /*
                         * If already output something, put out a newline as
                         * a separator.  If multiple arguments, precede each
                         * directory with its name.
                         */
                        if (output) {
                                putchar('\n');
                                (void)printname(p->fts_path);
                                puts(":");
                        } else if (argc > 1) {
                                (void)printname(p->fts_path);
                                puts(":");
                                output = 1;
                        }
                        chp = fts_children(ftsp, ch_options);
                        if (chp == NULL && errno != 0) {
                                warn("%s", p->fts_path);
                                rval = 1;

                                /*
                                 * Avoid further errors on this entry.  We won't
                                 * always get an FTS_ERR/FTS_DNR for errors
                                 * in fts_children(), because opendir could
                                 * have failed early on and that only flags an
                                 * error for fts_read() when we try to recurse
                                 * into it.  We catch both the non-recursive and
                                 * the recursive case here.
                                 */
                                (void)fts_set(ftsp, p, FTS_SKIP);
                                break;
                        }

                        display(p, chp, options);

                        if (!f_recursive && chp != NULL)
                                (void)fts_set(ftsp, p, FTS_SKIP);
                        break;
                default:
                        break;
                }
        if (errno)
                err(1, "fts_read");
        fts_close(ftsp);
}

/*
 * Display() takes a linked list of FTSENT structures and passes the list
 * along with any other necessary information to the print function.  P
 * points to the parent directory of the display list.
 */
static void
display(const FTSENT *p, FTSENT *list, int options)
{
        struct stat *sp;
        DISPLAY d;
        FTSENT *cur;
        NAMES *np;
        off_t maxsize;
        long maxblock;
        uintmax_t maxinode;
        u_long btotal, labelstrlen, maxlen, maxnlink;
        u_long maxlabelstr;
        u_int sizelen;
        int maxflags;
        gid_t maxgroup;
        uid_t maxuser;
        size_t flen, ulen, glen;
        char *initmax;
        int entries, needstats;
        const char *user, *group;
        char *flags, *labelstr = NULL;
        char ngroup[STRBUF_SIZEOF(uid_t) + 1];
        char nuser[STRBUF_SIZEOF(gid_t) + 1];
        u_long width[9];
        int i;

        needstats = f_inode || f_longform || f_size;
        flen = 0;
        btotal = 0;

#define LS_COLWIDTHS_FIELDS     9
        initmax = getenv("LS_COLWIDTHS");

        for (i = 0 ; i < LS_COLWIDTHS_FIELDS; i++)
                width[i] = 0;

        if (initmax != NULL) {
                char *endp;

                for (i = 0; i < LS_COLWIDTHS_FIELDS && *initmax != '\0'; i++) {
                        if (*initmax == ':') {
                                width[i] = 0;
                        } else {
                                width[i] = strtoul(initmax, &endp, 10);
                                initmax = endp;
                                while (isspace(*initmax))
                                        initmax++;
                                if (*initmax != ':')
                                        break;
                                initmax++;
                        }
                }
                if (i < LS_COLWIDTHS_FIELDS)
#ifdef COLORLS
                        if (!f_color)
#endif
                                f_notabs = 0;
        }

        /* Fields match -lios order.  New ones should be added at the end. */
        maxinode = width[0];
        maxblock = width[1];
        maxnlink = width[2];
        maxuser = width[3];
        maxgroup = width[4];
        maxflags = width[5];
        maxsize = width[6];
        maxlen = width[7];
        maxlabelstr = width[8];

        MAKENINES(maxinode);
        MAKENINES(maxblock);
        MAKENINES(maxnlink);
        MAKENINES(maxsize);

        d.s_size = 0;
        sizelen = 0;
        flags = NULL;
        for (cur = list, entries = 0; cur; cur = cur->fts_link) {
                if (cur->fts_info == FTS_ERR || cur->fts_info == FTS_NS) {
                        warnx("%s: %s",
                            cur->fts_name, strerror(cur->fts_errno));
                        cur->fts_number = NO_PRINT;
                        rval = 1;
                        continue;
                }
                /*
                 * P is NULL if list is the argv list, to which different rules
                 * apply.
                 */
                if (p == NULL) {
                        /* Directories will be displayed later. */
                        if (cur->fts_info == FTS_D && !f_listdir) {
                                cur->fts_number = NO_PRINT;
                                continue;
                        }
                } else {
                        /* Only display dot file if -a/-A set. */
                        if (cur->fts_name[0] == '.' && !f_listdot) {
                                cur->fts_number = NO_PRINT;
                                continue;
                        }
                }
                if (cur->fts_namelen > maxlen)
                        maxlen = cur->fts_namelen;
                if (f_octal || f_octal_escape) {
                        u_long t = len_octal(cur->fts_name, cur->fts_namelen);

                        if (t > maxlen)
                                maxlen = t;
                }
                if (needstats) {
                        sp = cur->fts_statp;
                        if (sp->st_blocks > maxblock)
                                maxblock = sp->st_blocks;
                        if (sp->st_ino > maxinode)
                                maxinode = sp->st_ino;
                        if (sp->st_nlink > maxnlink)
                                maxnlink = sp->st_nlink;
                        if (sp->st_size > maxsize)
                                maxsize = sp->st_size;

                        btotal += sp->st_blocks;
                        if (f_longform) {
                                if (f_numericonly) {
                                        (void)snprintf(nuser, sizeof(nuser),
                                            "%u", sp->st_uid);
                                        (void)snprintf(ngroup, sizeof(ngroup),
                                            "%u", sp->st_gid);
                                        user = nuser;
                                        group = ngroup;
                                } else {
                                        user = user_from_uid(sp->st_uid, 0);
                                        /*
                                         * user_from_uid(..., 0) only returns
                                         * NULL in OOM conditions.  We could
                                         * format the uid here, but (1) in
                                         * general ls(1) exits on OOM, and (2)
                                         * there is another allocation/exit
                                         * path directly below, which will
                                         * likely exit anyway.
                                         */
                                        if (user == NULL)
                                                err(1, "user_from_uid");
                                        group = group_from_gid(sp->st_gid, 0);
                                        /* Ditto. */
                                        if (group == NULL)
                                                err(1, "group_from_gid");
                                }
                                if ((ulen = strlen(user)) > maxuser)
                                        maxuser = ulen;
                                if ((glen = strlen(group)) > maxgroup)
                                        maxgroup = glen;
                                if (f_flags) {
                                        flags = fflagstostr(sp->st_flags);
                                        if (flags != NULL && *flags == '\0') {
                                                free(flags);
                                                flags = strdup("-");
                                        }
                                        if (flags == NULL)
                                                err(1, "fflagstostr");
                                        flen = strlen(flags);
                                        if (flen > (size_t)maxflags)
                                                maxflags = flen;
                                } else
                                        flen = 0;
                                labelstr = NULL;
                                if (f_label) {
                                        char name[PATH_MAX + 1];
                                        mac_t label;
                                        int error;

                                        error = mac_prepare_file_label(&label);
                                        if (error == -1) {
                                                warn("MAC label for %s/%s",
                                                    cur->fts_parent->fts_path,
                                                    cur->fts_name);
                                                goto label_out;
                                        }

                                        if (cur->fts_level == FTS_ROOTLEVEL)
                                                snprintf(name, sizeof(name),
                                                    "%s", cur->fts_name);
                                        else
                                                snprintf(name, sizeof(name),
                                                    "%s/%s", cur->fts_parent->
                                                    fts_accpath, cur->fts_name);

                                        if (options & FTS_LOGICAL)
                                                error = mac_get_file(name,
                                                    label);
                                        else
                                                error = mac_get_link(name,
                                                    label);
                                        if (error == -1) {
                                                warn("MAC label for %s/%s",
                                                    cur->fts_parent->fts_path,
                                                    cur->fts_name);
                                                mac_free(label);
                                                goto label_out;
                                        }

                                        error = mac_to_text(label,
                                            &labelstr);
                                        if (error == -1) {
                                                warn("MAC label for %s/%s",
                                                    cur->fts_parent->fts_path,
                                                    cur->fts_name);
                                                mac_free(label);
                                                goto label_out;
                                        }
                                        mac_free(label);
label_out:
                                        if (labelstr == NULL)
                                                labelstr = strdup("-");
                                        labelstrlen = strlen(labelstr);
                                        if (labelstrlen > maxlabelstr)
                                                maxlabelstr = labelstrlen;
                                } else
                                        labelstrlen = 0;

                                if ((np = malloc(sizeof(NAMES) + labelstrlen +
                                    ulen + glen + flen + 4)) == NULL)
                                        err(1, "malloc");

                                np->user = &np->data[0];
                                (void)strcpy(np->user, user);
                                np->group = &np->data[ulen + 1];
                                (void)strcpy(np->group, group);

                                if (S_ISCHR(sp->st_mode) ||
                                    S_ISBLK(sp->st_mode)) {
                                        sizelen = snprintf(NULL, 0,
                                            "%#jx", (uintmax_t)sp->st_rdev);
                                        if (d.s_size < sizelen)
                                                d.s_size = sizelen;
                                }

                                if (f_flags) {
                                        np->flags = &np->data[ulen + glen + 2];
                                        (void)strcpy(np->flags, flags);
                                        free(flags);
                                }
                                if (f_label) {
                                        np->label = &np->data[ulen + glen + 2
                                            + (f_flags ? flen + 1 : 0)];
                                        (void)strcpy(np->label, labelstr);
                                        free(labelstr);
                                }
                                cur->fts_pointer = np;
                        }
                }
                ++entries;
        }

        /*
         * If there are no entries to display, we normally stop right
         * here.  However, we must continue if we have to display the
         * total block count.  In this case, we display the total only
         * on the second (p != NULL) pass.
         */
        if (!entries && (!(f_longform || f_size) || p == NULL))
                return;

        d.list = list;
        d.entries = entries;
        d.maxlen = maxlen;
        if (needstats) {
                d.btotal = btotal;
                d.s_block = snprintf(NULL, 0, f_thousands ? "%'ld" : "%ld",
                    howmany(maxblock, blocksize));
                d.s_flags = maxflags;
                d.s_label = maxlabelstr;
                d.s_group = maxgroup;
                d.s_inode = snprintf(NULL, 0, "%ju", maxinode);
                d.s_nlink = snprintf(NULL, 0, "%lu", maxnlink);
                sizelen = f_humanval ? HUMANVALSTR_LEN :
                    snprintf(NULL, 0, "%ju", maxsize);
                if (d.s_size < sizelen)
                        d.s_size = sizelen;
                d.s_user = maxuser;
        }
        if (f_thousands)                        /* make space for commas */
                d.s_size += (d.s_size - 1) / 3;
        printfcn(&d);
        output = 1;

        if (f_longform)
                for (cur = list; cur; cur = cur->fts_link)
                        free(cur->fts_pointer);
}

/*
 * Ordering for mastercmp:
 * If ordering the argv (fts_level = FTS_ROOTLEVEL) return non-directories
 * as larger than directories.  Within either group, use the sort function.
 * All other levels use the sort function.  Error entries remain unsorted.
 */
static int
mastercmp(const FTSENT * const *a, const FTSENT * const *b)
{
        int a_info, b_info, dir;

        a_info = (*a)->fts_info;
        if (a_info == FTS_ERR)
                return (0);
        b_info = (*b)->fts_info;
        if (b_info == FTS_ERR)
                return (0);

        if (a_info == FTS_NS || b_info == FTS_NS)
                return (namecmp(*a, *b));

        if (a_info != b_info &&
            (*a)->fts_level == FTS_ROOTLEVEL && !f_listdir) {
                if (a_info == FTS_D)
                        return (1);
                if (b_info == FTS_D)
                        return (-1);
        }

        if (f_groupdir != GRP_NONE)
                if ((dir = (a_info == FTS_D) - (b_info == FTS_D)) != 0)
                        return (f_groupdir * dir);

        return (sortfcn(*a, *b));
}