/*      $OpenBSD: print.c,v 1.41 2024/03/27 14:44:52 millert Exp $      */
/*      $NetBSD: print.c,v 1.15 1996/12/11 03:25:39 thorpej Exp $       */

/*
 * 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/types.h>
#include <sys/stat.h>

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <limits.h>
#include <util.h>

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

static int      printaname(FTSENT *, int, int);
static void     printlink(FTSENT *);
static void     printsize(int, off_t);
static void     printtime(time_t);
static int      printtype(mode_t);
static int      compute_columns(DISPLAY *, int *);

#define IS_NOPRINT(p)   ((p)->fts_number == NO_PRINT)

#define DATELEN         64

#define SECSPERDAY      (24 * 60 * 60)
#define SIXMONTHS       (SECSPERDAY * 365 / 2)

void
printscol(DISPLAY *dp)
{
        FTSENT *p;

        for (p = dp->list; p; p = p->fts_link) {
                if (IS_NOPRINT(p))
                        continue;
                (void)printaname(p, dp->s_inode, dp->s_block);
                (void)putchar('\n');
        }
}

void
printlong(DISPLAY *dp)
{
        struct stat *sp;
        FTSENT *p;
        NAMES *np;
        char buf[20];

        if ((dp->list == NULL || dp->list->fts_level != FTS_ROOTLEVEL) &&
            (f_longform || f_size))
                (void)printf("total %llu\n", howmany(dp->btotal, blocksize));

        for (p = dp->list; p; p = p->fts_link) {
                if (IS_NOPRINT(p))
                        continue;
                sp = p->fts_statp;
                if (f_inode)
                        (void)printf("%*llu ", dp->s_inode,
                            (unsigned long long)sp->st_ino);
                if (f_size)
                        (void)printf("%*lld ", dp->s_block,
                            howmany((long long)sp->st_blocks, blocksize));
                (void)strmode(sp->st_mode, buf);
                np = p->fts_pointer;
                (void)printf("%s %*u ", buf, dp->s_nlink, sp->st_nlink);
                if (!f_grouponly)
                        (void)printf("%-*s  ", dp->s_user, np->user);
                (void)printf("%-*s  ", dp->s_group, np->group);
                if (f_flags)
                        (void)printf("%-*s ", dp->s_flags, np->flags);
                if (S_ISCHR(sp->st_mode) || S_ISBLK(sp->st_mode))
                        (void)printf("%*u, %*u ",
                            dp->s_major, major(sp->st_rdev),
                            dp->s_minor, minor(sp->st_rdev));
                else
                        printsize(dp->s_size, sp->st_size);
                if (f_accesstime)
                        printtime(sp->st_atime);
                else if (f_statustime)
                        printtime(sp->st_ctime);
                else
                        printtime(sp->st_mtime);
                (void)mbsprint(p->fts_name, 1);
                if (f_type || (f_typedir && S_ISDIR(sp->st_mode)))
                        (void)printtype(sp->st_mode);
                if (S_ISLNK(sp->st_mode))
                        printlink(p);
                (void)putchar('\n');
        }
}

static int
compute_columns(DISPLAY *dp, int *pnum)
{
        int colwidth;
        extern int termwidth;
        int mywidth;

        colwidth = dp->maxlen;
        if (f_inode)
                colwidth += dp->s_inode + 1;
        if (f_size)
                colwidth += dp->s_block + 1;
        if (f_type || f_typedir)
                colwidth += 1;

        colwidth += 1;
        mywidth = termwidth + 1;        /* no extra space for last column */

        if (mywidth < 2 * colwidth) {
                printscol(dp);
                return (0);
        }

        *pnum = mywidth / colwidth;
        return (mywidth / *pnum);               /* spread out if possible */
}

void
printcol(DISPLAY *dp)
{
        static FTSENT **array;
        static int lastentries = -1;
        FTSENT *p;
        int base, chcnt, col, colwidth, num;
        int numcols, numrows, row;

        if ((colwidth = compute_columns(dp, &numcols)) == 0)
                return;
        /*
         * Have to do random access in the linked list -- build a table
         * of pointers.
         */
        if (dp->entries > lastentries) {
                FTSENT **a;

                if ((a = reallocarray(array, dp->entries, sizeof(FTSENT *))) ==
                    NULL) {
                        free(array);
                        array = NULL;
                        dp->entries = 0;
                        lastentries = -1;
                        warn(NULL);
                        printscol(dp);
                        return;
                }
                lastentries = dp->entries;
                array = a;
        }
        for (p = dp->list, num = 0; p; p = p->fts_link)
                if (p->fts_number != NO_PRINT)
                        array[num++] = p;

        numrows = num / numcols;
        if (num % numcols)
                ++numrows;

        if ((dp->list == NULL || dp->list->fts_level != FTS_ROOTLEVEL) &&
            (f_longform || f_size))
                (void)printf("total %llu\n", howmany(dp->btotal, blocksize));
        for (row = 0; row < numrows; ++row) {
                for (base = row, col = 0;;) {
                        chcnt = printaname(array[base], dp->s_inode, dp->s_block);
                        if ((base += numrows) >= num)
                                break;
                        if (++col == numcols)
                                break;
                        while (chcnt++ < colwidth)
                                putchar(' ');
                }
                (void)putchar('\n');
        }
}

/*
 * print [inode] [size] name
 * return # of characters printed, no trailing characters.
 */
static int
printaname(FTSENT *p, int inodefield, int sizefield)
{
        struct stat *sp;
        int chcnt;

        sp = p->fts_statp;
        chcnt = 0;
        if (f_inode)
                chcnt += printf("%*llu ", inodefield,
                    (unsigned long long)sp->st_ino);
        if (f_size)
                chcnt += printf("%*lld ", sizefield,
                    howmany((long long)sp->st_blocks, blocksize));
        chcnt += mbsprint(p->fts_name, 1);
        if (f_type || (f_typedir && S_ISDIR(sp->st_mode)))
                chcnt += printtype(sp->st_mode);
        return (chcnt);
}

static void
printtime(time_t ftime)
{
        char f_date[DATELEN];
        struct tm *tm;
        static time_t now;
        static int now_set = 0;

        if (! now_set) {
                now = time(NULL);
                now_set = 1;
        }

        /*
         * convert time to string, and print
         */
        if ((tm = localtime(&ftime)) == NULL) {
                /* Invalid time stamp, just display the epoch. */
                ftime = 0;
                tm = localtime(&ftime);
        }
        if (strftime(f_date, sizeof(f_date), f_sectime ? "%b %e %H:%M:%S %Y" :
            (ftime <= now - SIXMONTHS || ftime > now) ? "%b %e  %Y" :
            "%b %e %H:%M", tm) == 0)
                f_date[0] = '\0';

        printf("%s ", f_date);
}

void
printacol(DISPLAY *dp)
{
        FTSENT *p;
        int chcnt, col, colwidth;
        int numcols;

        if ( (colwidth = compute_columns(dp, &numcols)) == 0)
                return;

        if ((dp->list == NULL || dp->list->fts_level != FTS_ROOTLEVEL) &&
            (f_longform || f_size))
                (void)printf("total %llu\n", howmany(dp->btotal, blocksize));
        col = 0;
        for (p = dp->list; p; p = p->fts_link) {
                if (IS_NOPRINT(p))
                        continue;
                if (col >= numcols) {
                        col = 0;
                        (void)putchar('\n');
                }
                chcnt = printaname(p, dp->s_inode, dp->s_block);
                col++;
                if (col < numcols)
                        while (chcnt++ < colwidth)
                                (void)putchar(' ');
        }
        (void)putchar('\n');
}

void
printstream(DISPLAY *dp)
{
        extern int termwidth;
        FTSENT *p;
        int col;
        int extwidth;

        extwidth = 0;
        if (f_inode)
                extwidth += dp->s_inode + 1;
        if (f_size)
                extwidth += dp->s_block + 1;
        if (f_type)
                extwidth += 1;

        for (col = 0, p = dp->list; p != NULL; p = p->fts_link) {
                if (IS_NOPRINT(p))
                        continue;
                if (col > 0) {
                        (void)putchar(','), col++;
                        if (col + 1 + extwidth + mbsprint(p->fts_name, 0) >=
                            termwidth)
                                (void)putchar('\n'), col = 0;
                        else
                                (void)putchar(' '), col++;
                }
                col += printaname(p, dp->s_inode, dp->s_block);
        }
        (void)putchar('\n');
}

static int
printtype(mode_t mode)
{
        switch (mode & S_IFMT) {
        case S_IFDIR:
                (void)putchar('/');
                return (1);
        case S_IFIFO:
                (void)putchar('|');
                return (1);
        case S_IFLNK:
                (void)putchar('@');
                return (1);
        case S_IFSOCK:
                (void)putchar('=');
                return (1);
        }
        if (mode & (S_IXUSR | S_IXGRP | S_IXOTH)) {
                (void)putchar('*');
                return (1);
        }
        return (0);
}

static void
printlink(FTSENT *p)
{
        int lnklen;
        char name[PATH_MAX], path[PATH_MAX];

        if (p->fts_level == FTS_ROOTLEVEL)
                (void)snprintf(name, sizeof(name), "%s", p->fts_name);
        else
                (void)snprintf(name, sizeof(name),
                    "%s/%s", p->fts_parent->fts_accpath, p->fts_name);
        if ((lnklen = readlink(name, path, sizeof(path) - 1)) == -1) {
                (void)fprintf(stderr, "\nls: %s: %s\n", name, strerror(errno));
                return;
        }
        path[lnklen] = '\0';
        (void)printf(" -> ");
        (void)mbsprint(path, 1);
}

static void
printsize(int width, off_t bytes)
{
        char ret[FMT_SCALED_STRSIZE];

        if ((f_humanval) && (fmt_scaled(bytes, ret) != -1)) {
                (void)printf("%*s ", width, ret);
                return;
        }
        (void)printf("%*lld ", width, (long long)bytes);
}