/*      $OpenBSD: gen_subs.c,v 1.34 2024/04/27 19:49:42 florian Exp $   */
/*      $NetBSD: gen_subs.c,v 1.5 1995/03/21 09:07:26 cgd Exp $ */

/*-
 * Copyright (c) 1992 Keith Muller.
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego.
 *
 * 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 <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utmp.h>
#include <vis.h>

#include "pax.h"
#include "extern.h"

/*
 * a collection of general purpose subroutines used by pax
 */

/*
 * constants used by ls_list() when printing out archive members
 */
#define MODELEN 20
#define DATELEN 64
#define SECSPERDAY      (24 * 60 * 60)
#define SIXMONTHS       (SECSPERDAY * 365 / 2)
#define CURFRMT         "%b %e %H:%M"
#define OLDFRMT         "%b %e  %Y"
#define NAME_WIDTH      8
#define TIMEFMT(t, now) \
        (((t) + SIXMONTHS <= (now) || (t) > (now)) ? OLDFRMT : CURFRMT)

/*
 * ls_list()
 *      list the members of an archive in ls format
 */

void
ls_list(ARCHD *arcn, time_t now, FILE *fp)
{
        struct stat *sbp;
        struct tm *tm;
        char f_mode[MODELEN];
        char f_date[DATELEN];
        int term;

        term = zeroflag ? '\0' : '\n';  /* path termination character */

        /*
         * if not verbose, just print the file name
         */
        if (!vflag) {
                if (zeroflag)
                        (void)fputs(arcn->name, fp);
                else
                        safe_print(arcn->name, fp);
                (void)putc(term, fp);
                (void)fflush(fp);
                return;
        }

        /*
         * user wants long mode
         */
        sbp = &(arcn->sb);
        strmode(sbp->st_mode, f_mode);

        /*
         * print file mode, link count, uid, gid and time
         */
        if ((tm = localtime(&(sbp->st_mtime))) == NULL)
                f_date[0] = '\0';
        else if (strftime(f_date, sizeof(f_date), TIMEFMT(sbp->st_mtime, now),
            tm) == 0)
                f_date[0] = '\0';
        (void)fprintf(fp, "%s%2u %-*.*s %-*.*s ", f_mode, sbp->st_nlink,
                NAME_WIDTH, UT_NAMESIZE, user_from_uid(sbp->st_uid, 0),
                NAME_WIDTH, UT_NAMESIZE, group_from_gid(sbp->st_gid, 0));

        /*
         * print device id's for devices, or sizes for other nodes
         */
        if ((arcn->type == PAX_CHR) || (arcn->type == PAX_BLK))
                (void)fprintf(fp, "%4lu, %4lu ",
                    (unsigned long)MAJOR(sbp->st_rdev),
                    (unsigned long)MINOR(sbp->st_rdev));
        else {
                (void)fprintf(fp, "%9llu ", sbp->st_size);
        }

        /*
         * print name and link info for hard and soft links
         */
        (void)fputs(f_date, fp);
        (void)putc(' ', fp);
        safe_print(arcn->name, fp);
        if (PAX_IS_HARDLINK(arcn->type)) {
                fputs(" == ", fp);
                safe_print(arcn->ln_name, fp);
        } else if (arcn->type == PAX_SLK) {
                fputs(" -> ", fp);
                safe_print(arcn->ln_name, fp);
        }
        (void)putc(term, fp);
        (void)fflush(fp);
}

/*
 * tty_ls()
 *      print a short summary of file to tty.
 */

void
ls_tty(ARCHD *arcn)
{
        struct tm *tm;
        char f_date[DATELEN];
        char f_mode[MODELEN];
        time_t now = time(NULL);

        /*
         * convert time to string, and print
         */
        if ((tm = localtime(&(arcn->sb.st_mtime))) == NULL)
                f_date[0] = '\0';
        else if (strftime(f_date, DATELEN, TIMEFMT(arcn->sb.st_mtime, now),
            tm) == 0)
                f_date[0] = '\0';
        strmode(arcn->sb.st_mode, f_mode);
        tty_prnt("%s%s %s\n", f_mode, f_date, arcn->name);
}

void
safe_print(const char *str, FILE *fp)
{
        char visbuf[5];
        const char *cp;

        /*
         * if printing to a tty, use vis(3) to print special characters.
         */
        if (isatty(fileno(fp))) {
                for (cp = str; *cp; cp++) {
                        (void)vis(visbuf, cp[0], VIS_CSTYLE, cp[1]);
                        (void)fputs(visbuf, fp);
                }
        } else {
                (void)fputs(str, fp);
        }
}

/*
 * asc_ul()
 *      convert hex/octal character string into a u_long. We do not have to
 *      check for overflow! (the headers in all supported formats are not large
 *      enough to create an overflow).
 *      NOTE: strings passed to us are NOT TERMINATED.
 * Return:
 *      unsigned long value
 */

u_long
asc_ul(char *str, int len, int base)
{
        char *stop;
        u_long tval = 0;

        stop = str + len;

        /*
         * skip over leading blanks and zeros
         */
        while ((str < stop) && ((*str == ' ') || (*str == '0')))
                ++str;

        /*
         * for each valid digit, shift running value (tval) over to next digit
         * and add next digit
         */
        if (base == HEX) {
                while (str < stop) {
                        if ((*str >= '0') && (*str <= '9'))
                                tval = (tval << 4) + (*str++ - '0');
                        else if ((*str >= 'A') && (*str <= 'F'))
                                tval = (tval << 4) + 10 + (*str++ - 'A');
                        else if ((*str >= 'a') && (*str <= 'f'))
                                tval = (tval << 4) + 10 + (*str++ - 'a');
                        else
                                break;
                }
        } else {
                while ((str < stop) && (*str >= '0') && (*str <= '7'))
                        tval = (tval << 3) + (*str++ - '0');
        }
        return(tval);
}

/*
 * ul_asc()
 *      convert an unsigned long into an hex/oct ascii string. pads with LEADING
 *      ascii 0's to fill string completely
 *      NOTE: the string created is NOT TERMINATED.
 */

int
ul_asc(u_long val, char *str, int len, int base)
{
        char *pt;
        u_long digit;

        /*
         * WARNING str is not '\0' terminated by this routine
         */
        pt = str + len - 1;

        /*
         * do a tailwise conversion (start at right most end of string to place
         * least significant digit). Keep shifting until conversion value goes
         * to zero (all digits were converted)
         */
        if (base == HEX) {
                while (pt >= str) {
                        if ((digit = (val & 0xf)) < 10)
                                *pt-- = '0' + (char)digit;
                        else
                                *pt-- = 'a' + (char)(digit - 10);
                        val >>= 4;
                        if (val == 0)
                                break;
                }
        } else {
                while (pt >= str) {
                        *pt-- = '0' + (char)(val & 0x7);
                        val >>= 3;
                        if (val == 0)
                                break;
                }
        }

        /*
         * pad with leading ascii ZEROS. We return -1 if we ran out of space.
         */
        while (pt >= str)
                *pt-- = '0';
        if (val != 0)
                return(-1);
        return(0);
}

/*
 * asc_ull()
 *      Convert hex/octal character string into a unsigned long long.
 *      We do not have to check for overflow!  (The headers in all
 *      supported formats are not large enough to create an overflow).
 *      NOTE: strings passed to us are NOT TERMINATED.
 * Return:
 *      unsigned long long value
 */

unsigned long long
asc_ull(char *str, int len, int base)
{
        char *stop;
        unsigned long long tval = 0;

        stop = str + len;

        /*
         * skip over leading blanks and zeros
         */
        while ((str < stop) && ((*str == ' ') || (*str == '0')))
                ++str;

        /*
         * for each valid digit, shift running value (tval) over to next digit
         * and add next digit
         */
        if (base == HEX) {
                while (str < stop) {
                        if ((*str >= '0') && (*str <= '9'))
                                tval = (tval << 4) + (*str++ - '0');
                        else if ((*str >= 'A') && (*str <= 'F'))
                                tval = (tval << 4) + 10 + (*str++ - 'A');
                        else if ((*str >= 'a') && (*str <= 'f'))
                                tval = (tval << 4) + 10 + (*str++ - 'a');
                        else
                                break;
                }
        } else {
                while ((str < stop) && (*str >= '0') && (*str <= '7'))
                        tval = (tval << 3) + (*str++ - '0');
        }
        return(tval);
}

/*
 * ull_asc()
 *      Convert an unsigned long long into a hex/oct ascii string.
 *      Pads with LEADING ascii 0's to fill string completely
 *      NOTE: the string created is NOT TERMINATED.
 */

int
ull_asc(unsigned long long val, char *str, int len, int base)
{
        char *pt;
        unsigned long long digit;

        /*
         * WARNING str is not '\0' terminated by this routine
         */
        pt = str + len - 1;

        /*
         * do a tailwise conversion (start at right most end of string to place
         * least significant digit). Keep shifting until conversion value goes
         * to zero (all digits were converted)
         */
        if (base == HEX) {
                while (pt >= str) {
                        if ((digit = (val & 0xf)) < 10)
                                *pt-- = '0' + (char)digit;
                        else
                                *pt-- = 'a' + (char)(digit - 10);
                        val >>= 4;
                        if (val == 0)
                                break;
                }
        } else {
                while (pt >= str) {
                        *pt-- = '0' + (char)(val & 0x7);
                        val >>= 3;
                        if (val == 0)
                                break;
                }
        }

        /*
         * pad with leading ascii ZEROS. We return -1 if we ran out of space.
         */
        while (pt >= str)
                *pt-- = '0';
        if (val != 0)
                return(-1);
        return(0);
}

/*
 * Copy at max min(bufz, fieldsz) chars from field to buf, stopping
 * at the first NUL char. NUL terminate buf if there is room left.
 */
size_t
fieldcpy(char *buf, size_t bufsz, const char *field, size_t fieldsz)
{
        char *p = buf;
        const char *q = field;
        size_t i = 0;

        if (fieldsz > bufsz)
                fieldsz = bufsz;
        while (i < fieldsz && *q != '\0') {
                *p++ = *q++;
                i++;
        }
        if (i < bufsz)
                *p = '\0';
        return(i);
}