doorman/doorman.cpp

#include "terminal.h"
#include "utils.h"
#include <ctype.h>
#include <fcntl.h>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <map>
#include <pty.h>
#include <sstream>
#include <stdio.h>
#include <stdlib.h> // random()
#include <string.h>
#include <string>
#include <strings.h> // strcasecmp
#include <sys/select.h>
#include <sys/wait.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

/*
  `Tip the DoorMan`

  DoorMan is a BBS door manager that handles translating UTF-8 to CP437 for
  using ncurses based programs as BBS doors.

  We might start with using the quite excellent iconv library for our
  conversions, but I believe I'll eventually switch to using a map of some sort
  to do the process. (Calling a library over and over again to convert the same
  chars to the same thing over and over again just sounds "wrong".)

  -NOXLATE   (No Translation, leave UTF-8 as-is)
  -ICONV     (Use ICONV)

  (Default will be using our own table.)

  We will also need to convert the user input (which will be a BBS Terminal
  program) into whatever Linux expects from users.  Function keys, arrow keys,
  etc.

  -NOTERM   (Don't translate the terminal input)

  Logging will be a huge requirement to figure much of this out!

  -NOLOG    (Disable logging)

  We'll want to optionally capture/eat Ctrl-C, because most programs quit on
  that.

  -NOC      (No Ctrl-C, not the default)

  Anything not matching here is considered to be the program + arguments.

 */

/*

"FEATURES"

We don't understand color code 96/97.  (Bright white/bright cyan).  Maybe try
mapping those back to the original non-bright colors?

There's a possibility of missing keys (if they aren't all received in one
"packet").  ?

Unicode double lines are definitely missing!    Yikes!
Anything else that exists in unicode that maps over to high ASCII.

https://en.wikipedia.org/wiki/Code_page_437

I'm not sure, but it almost looks like it has the CP437 char and then the
unicode char below it.  That might be exactly what I need!

https://jrgraphix.net/r/Unicode/2500-257F

http://xahlee.info/comp/unicode_drawing_shapes.html

Still need to finish up function keys.

still having issues with chars (mc, pageup/pagedown -- garbled chars, that looks
like missing unicode multi-byte issues)
 */

enum TRANSLATE { NONE, ICONV, INTERNAL } translate = NONE;

/*
https://softwareengineering.stackexchange.com/questions/141973/how-do-you-achieve-a-numeric-versioning-scheme-with-git

Use tags to mark commits with version numbers:

git tag -a v2.5 -m 'Version 2.5'

Push tags upstream—this is not done by default:

git push --tags

Then use the describe command:

git describe --tags --long
*/

std::string version = "0.0.0"; // DMVERSION;

// #include <signal.h> // handle Ctrl-C/SIGINT

/* Log level guideline:
 * - ZF_LOG_FATAL - happened something impossible and absolutely unexpected.
 *   Process can't continue and must be terminated.
 *   Example: division by zero, unexpected modifications from other thread.
 * - ZF_LOG_ERROR - happened something possible, but highly unexpected. The
 *   process is able to recover and continue execution.
 *   Example: out of memory (could also be FATAL if not handled properly).
 * - ZF_LOG_WARN - happened something that *usually* should not happen and
 *   significantly changes application behavior for some period of time.
 *   Example: configuration file not found, auth error.
 * - ZF_LOG_INFO - happened significant life cycle event or major state
 *   transition.
 *   Example: app started, user logged in.
 * - ZF_LOG_DEBUG - minimal set of events that could help to reconstruct the
 *   execution path. Usually disabled in release builds.
 * - ZF_LOG_VERBOSE - all other events. Usually disabled in release builds.
 *
 * *Ideally*, log file of debugged, well tested, production ready application
 * should be empty or very small. Choosing a right log level is as important as
 * providing short and self descriptive log message.
 */
/*
#define ZF_LOG_VERBOSE 1
#define ZF_LOG_DEBUG   2
#define ZF_LOG_INFO    3
#define ZF_LOG_WARN    4
#define ZF_LOG_ERROR   5
#define ZF_LOG_FATAL   6
*/

// When debugging low-level, use this:
// #define ZF_LOG_LEVEL ZF_LOG_VERBOSE
// Except this doesn't work.  It needs to be anywere the
// zf_log.h is included.

// LOGGING with file output

#include "zf_log.h"

FILE *g_log_file;

static void file_output_callback(const zf_log_message *msg, void *arg) {
  (void)arg;
  *msg->p = '\n';
  fwrite(msg->buf, msg->p - msg->buf + 1, 1, g_log_file);
  fflush(g_log_file);
}

static void file_output_close(void) { fclose(g_log_file); }

static int file_output_open(const char *const log_path) {
  g_log_file = fopen(log_path, "a");
  if (!g_log_file) {
    ZF_LOGW("Failed to open log file %s", log_path);
    return 0;
  }
  atexit(file_output_close);
  zf_log_set_output_v(ZF_LOG_PUT_STD, 0, file_output_callback);
  return 1;
}

void log_flush(void) { fflush(g_log_file); }

// END LOGGING

/*

This is done.  :D  My buffering system works with stack'em.

TO FIX:  Stop using c strings, must use char * buffer + int length.
MAY CONTAIN NULL VALUES.

Rework some things here.

Here's the "plan":

  if buffer is EMPTY:
      time_idle = 1;
      // setup for "random timeout value mess"
        // we're in luck!  The last parameter is time interval/timeout.  :D
      timeout.tv_sec = 10; // randrange(10-25)
      timeout.tv_usec = 0;

  NOT EMPTY:
      // we're in luck!  The last parameter is time interval/timeout.  :D
      timeout.tv_sec = 0;
      timeout.tv_usec = 10;   // Wild Guess Here?  Maybe higher, maybe
lower? time_idle = 0;

  ON READ:
    read/append to current buffer.
    We can't use nulls -- what if they are using ZModem, there's nulls in
the file! Look for trailing  / the very last "\r\n".

    (I could mangle/chunk it line by line.  But I'm not sure I'd need to do
that.)

    Optional "mangle" buffer up to that very point -- and send up to that
point.

    Option #2:  Maybe we send everything if program has been running for
under 20 seconds.  This would allow the ANSI detect to not get screwed up by
this new idea.

  ON TIMEOUT:
    if time_idle:
      Activate funny harry timeout events.
    else:
      Ok, we *STILL* haven't received any more characters into the buffer --
      even after waiting.  (Maybe we haven't waited long enough?)
      send the pending information in the buffer and clear it out.
      Maybe this is a prompt, and there won't be a \r\n.

This allows for cleaner process of "lines" of buffer.  We shouldn't break
in the midDLE OF A WORD.  Downside is that we sit on buffer contents a
little while / some amount of time -- which will add some lag to prompts
showing up.

(LAG?  Are you kidding?)


ZModem:

    start:  "rz^M**"...

    05-12 18:12:15.916 >> rz^M**^XB00000000000000^M<8A>^Q
    05-12 18:12:15.928 << **\x18B0100000023be50\r\n\x11
    05-12 18:12:15.928 >> *^XC^D
    05-12 18:12:15.939 << **\x18B0900000000a87c\r\n\x11
    05-12 18:12:15.940 >> *^XC
    # Start of PK zipfile.
    05-12 18:12:15.941 >> PK^C^D^T

    end:
    05-12 18:26:38.700 << **\x18B0100000023be50\r\n\x11
    05-12 18:26:38.700 >> **^XB0823a77600344c^M<8A>
    05-12 18:26:38.711 << **\x18B0800000000022d\r\n
    05-12 18:26:38.712 >> OO^MESC[0m

 */

// TODO:  Get everything above this -- into another file.

/*

void display_line(const char *line) {
  char input[1024];
  char output[1024];

  strcpy(input, line);
  converter.convert(input, output, sizeof(output));
  printf("%s\n", output);
}
*/

void terminal_output(TRANSLATE xlate, std::string &buffer) {
  /*
  The current problem is this.  The unichoad characters are getting spilt by
  buffer breaks.
   */
  static Terminal term;
  // static IConv converter("UTF-8", "CP437");

  // static IConv converter("CP437", "UTF-8"); // TO, FROM

  ZF_LOGV_MEM(buffer.data(), buffer.size(), "Buffer now:");
  ZF_LOGD("Buffer: %s", repr(buffer.c_str()));

  if (xlate == NONE) {
    // no translation
    write(STDOUT_FILENO, buffer.data(), buffer.size());
    buffer.clear();
  } else {

    std::string ansi;
    int dcs_mode = term.dcs();

    // The Hunt for Red Unichoad
    // https://en.wikipedia.org/wiki/UTF-8
    /*
    Number
    of bytes 	First
              code point 	Last
                          code point 	Byte 1 	Byte 2 	Byte 3 	Byte 4
    1 	      U+0000 	    U+007F 	0xxxxxxx
    2 	      U+0080 	    U+07FF 	110xxxxx 	10xxxxxx
    3 	      U+0800 	    U+FFFF 	1110xxxx 	10xxxxxx 	10xxxxxx
    4 	      U+10000 	  U+10FFFF[18] 	11110xxx 	10xxxxxx 10xxxxxx
    10xxxxxx
     */

    int length = buffer.size();
    int save = 0; // default to saving zero characters.

    char uchoad;
    // 1 char searches:
    if (length >= 1) {
      uchoad = buffer[length - 1];
      if ((uchoad & 0xe0) == 0xc0) {
        // CHOAD!
        save = 1;
      } else {
        if ((uchoad & 0xf0) == 0xe0) {
          save = 1;
        }
      }
    }

    if (length >= 2) {
      uchoad = buffer[length - 2];
      if ((uchoad & 0xf0) == 0xe0) {
        // CHOAD
        save = 2;
      }
    }

    /*  // if we're going back 3 chars, and the len=3 chars, leave it along. :P
    if (length >= 3) {
      uchoad = buffer[length - 3];
      if ((uchoad & 0xf0) == 0xe0) {
        // CHOAD
        save = 3;
      }
    }
    */

    std::string saved;

    if (save) {
      ZF_LOGE("Saving %d chars", save);
      ZF_LOGV_MEM(buffer.data(), buffer.size(), "PRE-SAVE:");
      saved = buffer.substr(length - save, save);
      buffer = buffer.substr(0, length - save);
      ZF_LOGV_MEM(buffer.data(), buffer.size(), "After Save:");
      ZF_LOGV_MEM(saved.data(), saved.size(), "SAVED:");
    }

    static std::map<const char *, int> utf8cp437 = {

        {"\xe2\x98\xba", 1},
        {"\xe2\x98\xbb", 2},
        {"\xe2\x99\xa5", 3},
        {"\xe2\x99\xa6", 4},
        {"\xe2\x99\xa3", 5},
        {"\xe2\x99\xa0", 6},
        // {"\xe2\x80\xa2", 7},    {"\xe2\x97\x98", 8},
        {"\xe2\x97\x8b", 9},
        //{"\xe2\x97\x99", 0x0a},
        {"\xe2\x99\x82", 0x0b},
        {"\xe2\x99\x80", 0x0c},
        //{"\xe2\x99\xaa", 0x0d},
        {"\xe2\x99\xab", 0x0e},
        {"\xe2\x98\xbc", 0x0f},
        {"\xe2\x96\xba", 0x10},
        {"\xe2\x97\x84", 0x11},
        {"\xe2\x86\x95", 0x12},
        {"\xe2\x80\xbc", 0x13},
        {"\xc2\xb6", 0x14},
        {"\xc2\xa7", 0x15},
        {"\xe2\x96\xac", 0x16},
        {"\xe2\x86\xa8", 0x17},
        {"\xe2\x86\x91", 0x18},
        {"\xe2\x86\x93", 0x19},
        {"\xe2\x86\x92", 0x1a},
        {"\xe2\x86\x90", 0x1b},
        {"\xe2\x88\x9f", 0x1c},
        {"\xe2\x86\x94", 0x1d},
        {"\xe2\x96\xb2", 0x1e},
        {"\xe2\x96\xbc", 0x1f},
        {"\xe2\x8c\x82", 0x7f},
        {"\xc3\x87", 0x80},
        {"\xc3\xbc", 0x81},
        {"\xc3\xa9", 0x82},
        {"\xc3\xa2", 0x83},
        {"\xc3\xa4", 0x84},
        {"\xc3\xa0", 0x85},
        {"\xc3\xa5", 0x86},
        {"\xc3\xa7", 0x87},
        {"\xc3\xaa", 0x88},
        {"\xc3\xab", 0x89},
        {"\xc3\xa8", 0x8a},
        {"\xc3\xaf", 0x8b},
        {"\xc3\xae", 0x8c},
        {"\xc3\xac", 0x8d},
        {"\xc3\x84", 0x8e},
        {"\xc3\x85", 0x8f},
        {"\xc3\x89", 0x90},
        {"\xc3\xa6", 0x91},
        {"\xc3\x86", 0x92},
        {"\xc3\xb4", 0x93},
        {"\xc3\xb6", 0x94},
        {"\xc3\xb2", 0x95},
        {"\xc3\xbb", 0x96},
        {"\xc3\xb9", 0x97},
        {"\xc3\xbf", 0x98},
        {"\xc3\x96", 0x99},
        {"\xc3\x9c", 0x9a},
        {"\xc2\xa2", 0x9b},
        {"\xc2\xa3", 0x9c},
        {"\xc2\xa5", 0x9d},
        {"\xe2\x82\xa7", 0x9e},
        {"\xc6\x92", 0x9f},
        {"\xc3\xa1", 0xa0},
        {"\xc3\xad", 0xa1},
        {"\xc3\xb3", 0xa2},
        {"\xc3\xba", 0xa3},
        {"\xc3\xb1", 0xa4},
        {"\xc3\x91", 0xa5},
        {"\xc2\xaa", 0xa6},
        {"\xc2\xba", 0xa7},
        {"\xc2\xbf", 0xa8},
        {"\xe2\x8c\x90", 0xa9},
        {"\xc2\xac", 0xaa},
        {"\xc2\xbd", 0xab},
        {"\xc2\xbc", 0xac},
        {"\xc2\xa1", 0xad},
        {"\xc2\xab", 0xae},
        {"\xc2\xbb", 0xaf},
        {"\xe2\x96\x91", 0xb0},
        {"\xe2\x96\x92", 0xb1},
        {"\xe2\x96\x93", 0xb2},
        {"\xe2\x94\x82", 0xb3},
        {"\xe2\x94\xa4", 0xb4},
        {"\xe2\x95\xa1", 0xb5},
        {"\xe2\x95\xa2", 0xb6},
        {"\xe2\x95\x96", 0xb7},
        {"\xe2\x95\x95", 0xb8},
        {"\xe2\x95\xa3", 0xb9},
        {"\xe2\x95\x91", 0xba},
        {"\xe2\x95\x97", 0xbb},
        {"\xe2\x95\x9d", 0xbc},
        {"\xe2\x95\x9c", 0xbd},
        {"\xe2\x95\x9b", 0xbe},
        {"\xe2\x94\x90", 0xbf},
        {"\xe2\x94\x94", 0xc0},
        {"\xe2\x94\xb4", 0xc1},
        {"\xe2\x94\xac", 0xc2},
        {"\xe2\x94\x9c", 0xc3},
        {"\xe2\x94\x80", 0xc4},
        {"\xe2\x94\xbc", 0xc5},
        {"\xe2\x95\x9e", 0xc6},
        {"\xe2\x95\x9f", 0xc7},
        {"\xe2\x95\x9a", 0xc8},
        {"\xe2\x95\x94", 0xc9},
        {"\xe2\x95\xa9", 0xca},
        {"\xe2\x95\xa6", 0xcb},
        {"\xe2\x95\xa0", 0xcc},
        {"\xe2\x95\x90", 0xcd},
        {"\xe2\x95\xac", 0xce},
        {"\xe2\x95\xa7", 0xcf},
        {"\xe2\x95\xa8", 0xd0},
        {"\xe2\x95\xa4", 0xd1},
        {"\xe2\x95\xa5", 0xd2},
        {"\xe2\x95\x99", 0xd3},
        {"\xe2\x95\x98", 0xd4},
        {"\xe2\x95\x92", 0xd5},
        {"\xe2\x95\x93", 0xd6},
        {"\xe2\x95\xab", 0xd7},
        {"\xe2\x95\xaa", 0xd8},
        {"\xe2\x94\x98", 0xd9},
        {"\xe2\x94\x8c", 0xda},
        {"\xe2\x96\x88", 0xdb},
        {"\xe2\x96\x84", 0xdc},
        {"\xe2\x96\x8c", 0xdd},
        {"\xe2\x96\x90", 0xde},
        {"\xe2\x96\x80", 0xdf},
        {"\xce\xb1", 0xe0},
        {"\xc3\x9f", 0xe1},
        {"\xce\x93", 0xe2},
        {"\xcf\x80", 0xe3},
        {"\xce\xa3", 0xe4},
        {"\xcf\x83", 0xe5},
        {"\xc2\xb5", 0xe6},
        {"\xcf\x84", 0xe7},
        {"\xce\xa6", 0xe8},
        {"\xce\x98", 0xe9},
        {"\xce\xa9", 0xea},
        {"\xce\xb4", 0xeb},
        {"\xe2\x88\x9e", 0xec},
        {"\xcf\x86", 0xed},
        {"\xce\xb5", 0xee},
        {"\xe2\x88\xa9", 0xef},
        {"\xe2\x89\xa1", 0xf0},
        {"\xc2\xb1", 0xf1},
        {"\xe2\x89\xa5", 0xf2},
        {"\xe2\x89\xa4", 0xf3},
        {"\xe2\x8c\xa0", 0xf4},
        {"\xe2\x8c\xa1", 0xf5},
        {"\xc3\xb7", 0xf6},
        {"\xe2\x89\x88", 0xf7},
        {"\xc2\xb0", 0xf8},
        {"\xe2\x88\x99", 0xf9},
        {"\xc2\xb7", 0xfa},
        {"\xe2\x88\x9a", 0xfb},
        {"\xe2\x81\xbf", 0xfc},
        {"\xc2\xb2", 0xfd},
        {"\xe2\x96\xa0", 0xfe},
        {"\xc2\xa0", 0xff}};

    if ((buffer.find('\xe2') != std::string::npos) ||
        (buffer.find('\xc2') != std::string::npos) ||
        (buffer.find('\xc3') != std::string::npos) ||
        (buffer.find('\xce') != std::string::npos) ||
        (buffer.find('\xcf') != std::string::npos)) {
      int c = 0;

      for (auto it = utf8cp437.begin(); it != utf8cp437.end(); ++it) {
        while (replace(buffer, it->first, std::string(1, char(it->second)))) {
          c++;
        }
      }
      if (c) {
        ZF_LOGE("Replaced %d", c);
        ZF_LOGV_MEM(buffer.data(), buffer.size(), "After Replace:");
      }
    }

    // Convert bright to bold.
    while (replace(buffer, "\x1b[90m", "\x1b[1;30m")) {
    };
    while (replace(buffer, "\x1b[91m", "\x1b[1;31m")) {
    };
    while (replace(buffer, "\x1b[92m", "\x1b[1;32m")) {
    };
    while (replace(buffer, "\x1b[93m", "\x1b[1;33m")) {
    };
    while (replace(buffer, "\x1b[94m", "\x1b[1;34m")) {
    };
    while (replace(buffer, "\x1b[95m", "\x1b[1;35m")) {
    };
    while (replace(buffer, "\x1b[96m", "\x1b[1;36m")) {
    };
    while (replace(buffer, "\x1b[97m", "\x1b[1;37m")) {
    };

    // Search for DCS mode, and translate the line characters.

    for (auto iter = buffer.begin(); iter != buffer.end(); ++iter) {
      char c = *iter;
      Terminal::termchar tc = term.putchar(c);
      if (tc.in_ansi) {
        ansi.append(1, c);
        if (tc.ansi == Terminal::ANSI_TYPE::START)
          continue;
        // Ok, the ansi command is completed.
        if (tc.ansi ==
            Terminal::ANSI_TYPE::DCS) { // Terminal::ANSI_TYPE::DCS) {
          // Ok, EAT this command!  it's worthless to the terminal we're talking
          // to.
          dcs_mode = term.dcs();
        }
      } else {
        // Ok, we're not in any ANSI mode.
        /*
        ┌ ─ ┬ ┐
        │ │ │ │
        ├ ─ ┼ ┤
        └ ─ ┴ ┘
         */
        if (dcs_mode == 0) {
          switch (c) {
          case 'j':
            c = '\xd9'; // '┘';
            break;
          case 'k':
            c = '\xbf'; // '┐';
            break;
          case 'l':
            c = '\xda'; // '┌';
            break;
          case 'm':
            c = '\xc0'; // '└';
            break;
          case 'n':
            c = '\xc5'; // '┼';
            break;
          case 'q':
            c = '\xc4'; // '─';
            break;
          case 't':
            c = '\xc3'; // '├';
            break;
          case 'u':
            c = '\xb4'; // '┤';
            break;
          case 'v':
            c = '\xc1'; // '┴';
            break;
          case 'w':
            c = '\xc2'; // '┬';
            break;
          case 'x':
            c = '\xb3'; // '│';
            break;
          default:
            ZF_LOGE("DCS(0): I don't have translation for [%c]", c);
          }
          ZF_LOGE("DCS(0) Converted [%c] to [%c]", *iter, c);
          *iter = c;
        }
      }
    }

    write(STDOUT_FILENO, buffer.data(), buffer.size());

    buffer.clear();
    buffer.insert(0, saved);
    saved.clear();
  };
}

void help(void) {
  printf("Usage:\n");
  printf("Translate (default to internal)\n");
  printf("\t-NOXLATE\tNo translation\n");
  printf("\t-ICONV\tUse ICONV library\n");
  printf("\t-NOLOG\tNo logging\n");
  printf("\t-NOC\tDon't allow Ctrl-C\n");
}

int main(int argc, char *argv[]) {
  int master;
  pid_t pid;

  // init_harry();
  srandom(time(NULL));

  /*
    -NOXLATE   (No Translation, leave UTF-8 as-is)
    -ICONV     (Use ICONV)
    -NOTERM   (Don't translate the terminal input)
    -NOLOG    (Disable logging)
    -NOC      (No Ctrl-C, not the default)
  */

  translate =
      ICONV; // Default to internal translation map (well, not initially.)

  int CATCH_CTRLC = 0;
  int NO_LOGGING = 0;
  int TERM_XLATE = 1;

  int x;
  for (x = 1; x < argc; x++) {
    if (strcasecmp("-NOXLATE", argv[x]) == 0) {
      translate = NONE;
      continue;
    }
    if (strcasecmp("-ICONV", argv[x]) == 0) {
      translate = ICONV;
      continue;
    }
    if (strcasecmp("-NOC", argv[x]) == 0) {
      CATCH_CTRLC = 1;
      continue;
    }
    if (strcasecmp("-NOLOG", argv[x]) == 0) {
      NO_LOGGING = 1;
      continue;
    }
    if (strcasecmp("-NOTERM", argv[x]) == 0) {
      TERM_XLATE = 0;
      continue;
    }
    if ((strcasecmp("-H", argv[x]) == 0) || (strcmp("-?", argv[x]) == 0)) {
      // display help information.
      help();
      return 0;
    }
    if (argv[x][0] == '-') {
      printf("I don't understand arg %s\n", argv[x]);
      help();
      return 0;
    }
    break;
  }

  if (x == argc) {
    help();
    return 0;
  }

  std::string logfile;
  {
    std::ostringstream buffer;

    time_t now = time(NULL);
    struct tm *tmp;
    tmp = gmtime(&now);
    // tmp->tm_mon

    buffer << "doorman-" << tmp->tm_year + 1900 << "-" << std::setfill('0')
           << std::setw(2) << tmp->tm_mon + 1 << "-" << std::setfill('0')
           << std::setw(2) << tmp->tm_mday << ".log";
    logfile = buffer.str();
  };

  if (NO_LOGGING) {
    zf_log_set_output_level(ZF_LOG_NONE);
  } else {
    if (!file_output_open((const char *)logfile.c_str()))
      return 2;
  };

  ZF_LOGE("DoorMan %s", version.c_str());

  // Build the new command to run here
  char *args[20]; // max 20 args
  char *target_exec = argv[x];
  ZF_LOGE("Target: (%d) [%s]", x, target_exec);

  // build new args list
  args[0] = target_exec;

  // We have the target, skip to the next arg
  if (x < argc)
    ++x;

  int ax = 1;
  for (; x < argc; x++) {
    args[ax] = argv[x];
    ZF_LOGD("ARG %d : %s", ax, args[ax]);
    ax++;
  };

  // null term the list
  args[ax] = NULL;

  pid = forkpty(&master, NULL, NULL, NULL);

  // impossible to fork
  if (pid < 0) {
    return 1;
  }

  // child
  else if (pid == 0) {
    // This has been done up above.

    /*
    char *args[20]; // max 20 args
    int x;
    char new_exec[] = TARGET;

    // build new args list
    args[0] = new_exec;

    for (x = 1; x < argc; x++) {
      args[x] = argv[x];
    };

    // null term the list
    args[x] = NULL;
    */
    // run TARGET, run!
    /*
    for (x = 0; args[x] != nullptr; x++) {
      ZF_LOGD("%d : %s", x, args[x]);
    }
    */

    execvp(target_exec, args);
  }

  // parent
  else {
    struct termios tios, orig1;
    struct timeval timeout;

    ZF_LOGD("starting");

    tcgetattr(master, &tios);
    tios.c_lflag &= ~(ECHO | ECHONL | ICANON);
    /*
    tios.c_iflag &= ~(ICRNL | IXON | BRKINT);
    tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    tios.c_oflag &= ~(OPOST);
    */
    tcsetattr(master, TCSAFLUSH, &tios);

    tcgetattr(1, &orig1);
    tios = orig1;
    /*
    tios.c_iflag &= ~(ICRNL | IXON | BRKINT);
    tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    tios.c_oflag &= ~(OPOST);
    */

    tios.c_iflag &= ~(ICRNL | IXON | ISTRIP | BRKINT);
    tios.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
    tios.c_oflag &= ~(OPOST);
    tios.c_cflag |= (CS8);

    // https://viewsourcecode.org/snaptoken/kilo/02.enteringRawMode.html
    tcsetattr(1, TCSAFLUSH, &tios);

    /*
    This doesn't need to be static -- because it is part of
    main.  Once main ends, we're done.
    */
#define BSIZE 128

    std::string buffer;
    buffer.reserve(BSIZE);

    for (;;) {
      // define estruturas para o select, que serve para verificar qual
      // se tornou "pronto pra uso"
      fd_set read_fd;
      fd_set write_fd;
      fd_set except_fd;

      // inicializa as estruturas
      FD_ZERO(&read_fd);
      FD_ZERO(&write_fd);
      FD_ZERO(&except_fd);

      // atribui o descritor master, obtido pelo forkpty, ao read_fd
      FD_SET(master, &read_fd);
      // atribui o stdin ao read_fd
      FD_SET(STDIN_FILENO, &read_fd);

      // o descritor tem que ser unico para o programa, a documentacao
      // recomenda um calculo entre os descritores sendo usados + 1

      timeout.tv_sec = 0;
      timeout.tv_usec = 0;
      // if (select(master + 1, &read_fd, &write_fd, &except_fd, &timeout) == 0)
      // {
      if (select(master + 1, &read_fd, &write_fd, &except_fd, NULL) == 0) {
        ZF_LOGI("TIMEOUT");
        // This means timeout!
      }

      // read_fd esta atribuido com read_fd?
      if (FD_ISSET(master, &read_fd)) {
        // leia o que bc esta mandando
        // ZF_LOGD("read (%d) %d bytes", size, BSIZE - size);
        char read_buffer[BSIZE + 1];
        int total;

        // We may adjust this later on (adjusting read length).
        if ((total = read(master, read_buffer, BSIZE)) != -1) {

          // Ok, we've read more into the buffer.
          ZF_LOGV("Read %d bytes", total);
          buffer.append(read_buffer, total);

          terminal_output(translate, buffer);

          /*
          if (0) { // zmodem) {
            // ZF_LOGI("Buffer %lu bytes, zmodem...", buffer.size());

            write(STDOUT_FILENO, buffer.data(), buffer.size());
            // console_receive(&console, buffer);
            buffer.clear();
          } else {
            // ZF_LOGV_MEM(buffer + size, total, "Read %d bytes:", total);
            // size += total;
            ZF_LOGV_MEM(buffer.data(), buffer.size(), "Buffer now:");

            write(STDOUT_FILENO, buffer.data(), buffer.size());
            // console_receive(&console, buffer);
            buffer.clear();
          }
          */

        } else
          break;
      }

      // read_fd esta atribuido com a entrada padrao?
      if (FD_ISSET(STDIN_FILENO, &read_fd)) {
        // leia a entrada padrao
        char input[BSIZE];
        int r = read(STDIN_FILENO, &input, BSIZE);
        input[r] = 0;
        // e escreva no bc
        ZF_LOGI("<< %s", repr(input));

        if (CATCH_CTRLC) {
          char *cp;
          int found = 0;
          while ((cp = strchr(input, '\x03')) != NULL) {
            memmove(cp, cp + 1, strlen(cp));
            r--;
            found++;
          }
          ZF_LOGI("Removed %d ^Cs", found);
        }

        std::string input_str = input;

        if (TERM_XLATE) {
          // We're going to try it without any buffer or understanding of ANSI
          // codes.
          int c;

          while (replace(input_str, "\x1b[A", "\x1bOA")) {
            c++;
          };
          while (replace(input_str, "\x1b[B", "\x1bOB")) {
            c++;
          };
          while (replace(input_str, "\x1b[C", "\x1bOC")) {
            c++;
          };
          while (replace(input_str, "\x1b[D", "\x1bOD")) {
            c++;
          }

          while (replace(input_str, "\x1b[U", "\x1b[6\x7e")) {
            c++;
          }
          while (replace(input_str, "\x1b[V", "\x1b[5\x7e")) {
            c++;
          }
          while (replace(input_str, "\x1b[H", "\x1bOH")) {
            c++;
          }
          while (replace(input_str, "\x1b[K", "\x1bOF")) {
            c++;
          }
          while (replace(input_str, "\x1b[@", "\x1b[2\x7e")) {
            c++;
          }
          while (replace(input_str, "\x1b[1", "\x1bOR")) { // F3
            c++;
          }

          while (replace(input_str, "\r\n", "\r")) {
            c++;
          }
          if (c) {
            ZF_LOGE("Input %d now [%s]", c, repr(input_str.c_str()));
          }
        }

        // write(master, &input, r);
        write(master, input_str.data(), input_str.size());

        // This is INPUT from the USER
        // ZF_LOGI_MEM( input, strlen(input), "<< ");
      }
    }

    // Restore terminal
    tcsetattr(1, TCSAFLUSH, &orig1);
    ZF_LOGD("exit");
  }

  return 0;
}