/*-
 * 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.
 *
 * @(#)print.c  8.4 (Berkeley) 4/17/94
 * $FreeBSD: src/bin/ls/print.c,v 1.73 2004/06/08 09:27:42 das Exp $
 */

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

#include <err.h>
#include <errno.h>
#include <fts.h>
#include <langinfo.h>
#include <libutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <locale.h>
#ifdef COLORLS
#include <ctype.h>
#include <termcap.h>
#include <signal.h>
#endif

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

static int      printaname(const FTSENT *, u_long, u_long);
static void     printlink(const FTSENT *);
static void     printtime(const struct timespec);
static int      printtype(u_int);
static void     printsize(size_t, off_t);
#ifdef COLORLS
static void     endcolor(int);
static int      colortype(mode_t);
#endif

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

#ifdef COLORLS
/* Most of these are taken from <sys/stat.h> */
typedef enum Colors {
        C_DIR,                  /* directory */
        C_LNK,                  /* symbolic link */
        C_SOCK,                 /* socket */
        C_FIFO,                 /* pipe */
        C_EXEC,                 /* executable */
        C_BLK,                  /* block special */
        C_CHR,                  /* character special */
        C_SUID,                 /* setuid executable */
        C_SGID,                 /* setgid executable */
        C_WSDIR,                /* directory writeble to others, with sticky
                                 * bit */
        C_WDIR,                 /* directory writeble to others, without
                                 * sticky bit */
        C_NUMCOLORS             /* just a place-holder */
} Colors;

static const char *defcolors = "exfxcxdxbxegedabagacad";

/* colors for file types */
static struct {
        int     num[2];
        int     bold;
} colors[C_NUMCOLORS];
#endif

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

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

/*
 * print name in current style
 */
int
printname(const char *name)
{
        if (f_octal || f_octal_escape)
                return prn_octal(name);
        else if (f_nonprint)
                return prn_printable(name);
        else
                return prn_normal(name);
}

void
printlong(const DISPLAY *dp)
{
        struct stat *sp;
        FTSENT *p;
        NAMES *np;
        char buf[20];
#ifdef COLORLS
        int color_printed = 0;
#endif

        if ((dp->list == NULL || dp->list->fts_level != FTS_ROOTLEVEL) &&
            (f_longform || f_size)) {
                printf("total %lu\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)
                        printf("%*ju ", dp->s_inode, (uintmax_t)sp->st_ino);
                if (f_size)
                        printf("%*jd ",
                            dp->s_block, howmany(sp->st_blocks, blocksize));
                strmode(sp->st_mode, buf);
                np = p->fts_pointer;
                printf("%s %*u %-*s  %-*s  ", buf, dp->s_nlink,
                    sp->st_nlink, dp->s_user, np->user, dp->s_group,
                    np->group);
                if (f_flags)
                        printf("%-*s ", dp->s_flags, np->flags);
                if (S_ISCHR(sp->st_mode) || S_ISBLK(sp->st_mode))
                        printf("%3d, 0x%08x ",
                               major(sp->st_rdev), (u_int)minor(sp->st_rdev));
                else if (dp->bcfile)
                        printf("%*s%*jd ",
                            8 - dp->s_size, "", dp->s_size, (intmax_t)sp->st_size);
                else
                        printsize(dp->s_size, sp->st_size);
                if (f_accesstime)
                        printtime(sp->st_atim);
                else if (f_statustime)
                        printtime(sp->st_ctim);
                else
                        printtime(sp->st_mtim);
                putchar(' ');
#ifdef COLORLS
                if (f_color)
                        color_printed = colortype(sp->st_mode);
#endif
                printname(p->fts_name);
#ifdef COLORLS
                if (f_color && color_printed)
                        endcolor(0);
#endif
                if (f_type)
                        printtype(sp->st_mode);
                if (S_ISLNK(sp->st_mode))
                        printlink(p);
                putchar('\n');
        }
}

void
printstream(const DISPLAY *dp)
{
        FTSENT *p;
        int chcnt;

        for (p = dp->list, chcnt = 0; p; p = p->fts_link) {
                if (p->fts_number == NO_PRINT)
                        continue;
                /* XXX strlen does not take octal escapes into account. */
                if (strlen(p->fts_name) + chcnt +
                    (p->fts_link ? 2 : 0) >= (unsigned)termwidth) {
                        putchar('\n');
                        chcnt = 0;
                }
                chcnt += printaname(p, dp->s_inode, dp->s_block);
                if (p->fts_link) {
                        printf(", ");
                        chcnt += 2;
                }
        }
        if (chcnt)
                putchar('\n');
}

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

        if (f_notabs)
                tabwidth = 1;
        else
                tabwidth = 8;

        /*
         * Have to do random access in the linked list -- build a table
         * of pointers.
         */
        if (dp->entries > lastentries) {
                lastentries = dp->entries;
                if ((narray =
                    realloc(array, dp->entries * sizeof(FTSENT *))) == NULL) {
                        warn(NULL);
                        printscol(dp);
                        return;
                }
                lastentries = dp->entries;
                array = narray;
        }
        for (p = dp->list, num = 0; p; p = p->fts_link)
                if (p->fts_number != NO_PRINT)
                        array[num++] = p;

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

        colwidth = rounddown2(colwidth + tabwidth, tabwidth);
        if (termwidth < 2 * colwidth) {
                printscol(dp);
                return;
        }
        numcols = termwidth / colwidth;
        numrows = num / numcols;
        if (num % numcols)
                ++numrows;

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

        /* counter if f_sortacross, else case-by-case */
        base = 0;

        for (row = 0; row < numrows; ++row) {
                endcol = colwidth;
                if (!f_sortacross)
                        base = row;
                for (col = 0, chcnt = 0; col < numcols; ++col) {
                        chcnt += printaname(array[base], dp->s_inode,
                            dp->s_block);
                        if (f_sortacross)
                                base++;
                        else
                                base += numrows;
                        if (base >= num)
                                break;
                        while ((cnt = (rounddown2(chcnt + tabwidth, tabwidth)))
                            <= endcol) {
                                if (f_sortacross && col + 1 >= numcols)
                                        break;
                                putchar(f_notabs ? ' ' : '\t');
                                chcnt = cnt;
                        }
                        endcol += colwidth;
                }
                putchar('\n');
        }
}

/*
 * print [inode] [size] name
 * return # of characters printed, no trailing characters.
 */
static int
printaname(const FTSENT *p, u_long inodefield, u_long sizefield)
{
        struct stat *sp;
        int chcnt;
#ifdef COLORLS
        int color_printed = 0;
#endif

        sp = p->fts_statp;
        chcnt = 0;
        if (f_inode) {
                chcnt += printf("%*ju ", (int)inodefield,
                                (uintmax_t)sp->st_ino);
        }
        if (f_size)
                chcnt += printf("%*jd ",
                    (int)sizefield, howmany(sp->st_blocks, blocksize));
#ifdef COLORLS
        if (f_color)
                color_printed = colortype(sp->st_mode);
#endif
        chcnt += printname(p->fts_name);
#ifdef COLORLS
        if (f_color && color_printed)
                endcolor(0);
#endif
        if (f_type)
                chcnt += printtype(sp->st_mode);
        return (chcnt);
}

static void
printtime(const struct timespec stt)
{
        char longstring[80];
        static time_t now;
        const struct tm *ptime;
        const char *format;
        static char *lc_time;
        static int posix_time;

#define SIXMONTHS       ((365 / 2) * 86400)

        if (now == 0)
                now = time(NULL);

        if (lc_time == NULL) {
                lc_time = setlocale(LC_TIME, NULL);
                posix_time = (strcmp(lc_time, "C") == 0);
        }

        if (f_timeformat) {
                /*
                 * User specified format
                 */
                format = f_timeformat;
        } else if (f_sectime) {
                /*
                 * POSIX: Not covered by standard.  If C/POSIX locale used
                 *        the old convention of mmm dd hh:mm:ss yyyy is kept.
                 * Named locales use the extended ISO 8601 format without T:
                 *        YYYY-DD-MM hh:mm:ss
                 */
                format = posix_time ? "%b %e %T %Y" : "%F %T";
        } else if (posix_time) {
                /*
                 * POSIX: Future or older than 6 months returns equivalent of
                 *        date "+%b %e  %Y"
                 *        If file was modified within the past 6 months,
                 *        return equivalent of: date "+%b %e %H:%M"
                 */
                if ((stt.tv_sec > now) || (stt.tv_sec < now - SIXMONTHS))
                        format = "%b %e  %Y";
                else
                        format = "%b %e %R";
        } else {
                /*
                 * Named locales use format DD-MMM-YYYY hh:mm
                 * Regardless of locale, English is used for month field
                 */
                format = "%d-%b-%Y %H:%M";
        }

        /*
         * If printing the nanotime field, always use GMT time
         */
        if (f_nanotime)
                ptime = gmtime(&(stt.tv_sec));
        else
                ptime = localtime(&(stt.tv_sec));

        strftime_l(longstring, sizeof(longstring), format, ptime, NULL);
        fputs(longstring, stdout);
        if (f_nanotime)
                printf(".%09ju", stt.tv_nsec);
}

static int
printtype(u_int mode)
{

        if (f_slash) {
                if ((mode & S_IFMT) == S_IFDIR) {
                        putchar('/');
                        return (1);
                }
                return (0);
        }

        switch (mode & S_IFMT) {
        case S_IFDIR:
                putchar('/');
                return (1);
        case S_IFIFO:
                putchar('|');
                return (1);
        case S_IFLNK:
                putchar('@');
                return (1);
        case S_IFSOCK:
                putchar('=');
                return (1);
        case S_IFWHT:
                putchar('%');
                return (1);
        default:
                break;
        }
        if (mode & (S_IXUSR | S_IXGRP | S_IXOTH)) {
                putchar('*');
                return (1);
        }
        return (0);
}

#ifdef COLORLS
static int
putch(int c)
{
        putchar(c);
        return 0;
}

static int
writech(int c)
{
        char tmp = (char)c;

        write(STDOUT_FILENO, &tmp, 1);
        return 0;
}

static void
printcolor(Colors c)
{
        char *ansiseq;

        if (colors[c].bold)
                tputs(enter_bold, 1, putch);

        if (colors[c].num[0] != -1) {
                ansiseq = tgoto(ansi_fgcol, 0, colors[c].num[0]);
                if (ansiseq)
                        tputs(ansiseq, 1, putch);
        }
        if (colors[c].num[1] != -1) {
                ansiseq = tgoto(ansi_bgcol, 0, colors[c].num[1]);
                if (ansiseq)
                        tputs(ansiseq, 1, putch);
        }
}

static void
endcolor(int sig)
{
        tputs(ansi_coloff, 1, sig ? writech : putch);
        tputs(attrs_off, 1, sig ? writech : putch);
}

static int
colortype(mode_t mode)
{
        switch (mode & S_IFMT) {
        case S_IFDIR:
                if (mode & S_IWOTH)
                        if (mode & S_ISTXT)
                                printcolor(C_WSDIR);
                        else
                                printcolor(C_WDIR);
                else
                        printcolor(C_DIR);
                return (1);
        case S_IFLNK:
                printcolor(C_LNK);
                return (1);
        case S_IFSOCK:
                printcolor(C_SOCK);
                return (1);
        case S_IFIFO:
                printcolor(C_FIFO);
                return (1);
        case S_IFBLK:
                printcolor(C_BLK);
                return (1);
        case S_IFCHR:
                printcolor(C_CHR);
                return (1);
        default:;
        }
        if (mode & (S_IXUSR | S_IXGRP | S_IXOTH)) {
                if (mode & S_ISUID)
                        printcolor(C_SUID);
                else if (mode & S_ISGID)
                        printcolor(C_SGID);
                else
                        printcolor(C_EXEC);
                return (1);
        }
        return (0);
}

void
parsecolors(const char *cs)
{
        int i;
        int j;
        size_t len;
        char c[2];
        short legacy_warn = 0;

        if (cs == NULL)
                cs = "";        /* LSCOLORS not set */
        len = strlen(cs);
        for (i = 0; i < C_NUMCOLORS; i++) {
                colors[i].bold = 0;

                if (len <= 2 * (size_t)i) {
                        c[0] = defcolors[2 * i];
                        c[1] = defcolors[2 * i + 1];
                } else {
                        c[0] = cs[2 * i];
                        c[1] = cs[2 * i + 1];
                }
                for (j = 0; j < 2; j++) {
                        /* Legacy colours used 0-7 */
                        if (c[j] >= '0' && c[j] <= '7') {
                                colors[i].num[j] = c[j] - '0';
                                if (!legacy_warn) {
                                        warnx("LSCOLORS should use "
                                              "characters a-h instead of 0-9 ("
                                              "see the manual page)\n");
                                }
                                legacy_warn = 1;
                        } else if (c[j] >= 'a' && c[j] <= 'h')
                                colors[i].num[j] = c[j] - 'a';
                        else if (c[j] >= 'A' && c[j] <= 'H') {
                                colors[i].num[j] = c[j] - 'A';
                                colors[i].bold = 1;
                        } else if (tolower((unsigned char)c[j]) == 'x')
                                colors[i].num[j] = -1;
                        else {
                                warnx("invalid character '%c' in LSCOLORS"
                                      " env var\n", c[j]);
                                colors[i].num[j] = -1;
                        }
                }
        }
}

void
colorquit(int sig)
{
        endcolor(sig);

        signal(sig, SIG_DFL);
        kill(getpid(), sig);
}

#endif /* COLORLS */

static void
printlink(const FTSENT *p)
{
        int lnklen;
        char name[MAXPATHLEN + 1];
        char path[MAXPATHLEN + 1];

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

static void
printsize(size_t width, off_t bytes)
{
        if (f_humanval) {
                char buf[5];

                humanize_number(buf, sizeof(buf), (int64_t)bytes, "",
                                HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
                printf("%5s ", buf);
        } else
                printf("%*jd ", (int)width, (uintmax_t)bytes);
}