/*-
 * Copyright (c) 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)ppt.c    8.1 (Berkeley) 5/31/93
 * $NetBSD: ppt.c,v 1.4 1995/03/23 08:35:40 cgd Exp $
 * $OpenBSD: ppt.c,v 1.17 2016/03/07 12:07:56 mestre Exp $
 */

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>


#define EDGE    "___________"

static void     usage(void);
static void     putppt(int);
static int      getppt(const char *buf);

void
usage(void)
{
        fprintf(stderr, "usage: %s [string ...]\n", getprogname());
        fprintf(stderr, "usage: %s -d [-b]\n", getprogname());
        exit(1);
}

int
main(int argc, char **argv)
{
        char *p, buf[132];
        int c, start, seenl, dflag, bflag;

        /* revoke setgid privileges */
        setgid(getgid());

        dflag = bflag = 0;
        while ((c = getopt(argc, argv, "bdh")) != -1)
                switch(c) {
                case 'd':
                        dflag = 1;
                        break;
                case 'b':
                        bflag = 1;
                        break;
                case 'h':
                default:
                        usage();
                }
        if (bflag && !dflag)
                usage();
        argc -= optind;
        argv += optind;

        if (dflag) {
                if (argc > 0)
                        usage();

                seenl = start = 0;
                while (fgets(buf, sizeof(buf), stdin) != NULL) {
                        c = getppt(buf);
                        if (c == -2)
                                continue;
                        if (c == -1) {
                                if (start)
                                        /* lost sync */
                                        putchar('x');
                                continue;
                        }
                        start = 1;
                        if (bflag)
                                putchar(c);
                        else {
                                char vbuf[5];
                                vis(vbuf, c, VIS_NOSLASH, 0);
                                fputs(vbuf, stdout);
                        }
                        seenl = (c == '\n');
                }
                if (!feof(stdin))
                        err(1, "fgets");
                if (!seenl && !bflag)
                        putchar('\n');
        } else {
                puts(EDGE);
                if (argc > 0)
                        while ((p = *argv++)) {
                                for (; *p != '\0'; ++p)
                                        putppt((int)*p);
                                if (*argv)
                                        putppt((int)' ');
                        }
                else while ((c = getchar()) != EOF)
                        putppt(c);
                puts(EDGE);
        }
        return 0;
}

void
putppt(int c)
{
        int i;

        putchar('|');
        for (i = 7; i >= 0; i--) {
                if (i == 2)
                        putchar('.');   /* feed hole */
                if ((c & (1 << i)) != 0)
                        putchar('o');
                else
                        putchar(' ');
        }
        putchar('|');
        putchar('\n');
}

int
getppt(const char *buf)
{
        int c;

        /* Demand left-aligned paper tape, but allow comments to the right */
        if (strncmp(buf, EDGE, strlen(EDGE)) == 0)
            return (-2);
        if (strlen(buf) < 12 || buf[0] != '|' || buf[10] != '|' ||
            buf[6] != '.' || strspn(buf, "| o.") < 11)
                return (-1);

        c = 0;
        if (buf[1] != ' ')
                c |= 0200;
        if (buf[2] != ' ')
                c |= 0100;
        if (buf[3] != ' ')
                c |= 0040;
        if (buf[4] != ' ')
                c |= 0020;
        if (buf[5] != ' ')
                c |= 0010;
        if (buf[7] != ' ')
                c |= 0004;
        if (buf[8] != ' ')
                c |= 0002;
        if (buf[9] != ' ')
                c |= 0001;

        return (c);
}