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/*
     W32 version of 'cat' program
     Copyright (C) 2012 LRN

     cat is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     cat is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with cat; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     Boston, MA 02110-1301, USA.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

#include <stdio.h>
#include <windows.h>
#include <stdint.h>
#include <signal.h>

DWORD WINAPI
parent_control_thread(LPVOID lpParameter)
{
  HANDLE h = (HANDLE)lpParameter;

  while (TRUE)
    {
      DWORD dw;
      BOOL b;
      unsigned char c;
      b = ReadFile(h, &c, 1, &dw, NULL);
      if (!b)
        {
          ExitProcess(0);
        }
      raise((int)c);
    }
}

void
install_parent_control_handler()
{
  const char *env_buf;
  char *env_buf_end;
  uint64_t pipe_fd;
  HANDLE pipe_handle;

  env_buf = getenv("GNUNET_OS_CONTROL_PIPE");
  if ((NULL == env_buf) || (strlen(env_buf) <= 0))
    return;
  errno = 0;
  pipe_fd = strtoull(env_buf, &env_buf_end, 16);
  if ((0 != errno) || (env_buf == env_buf_end))
    return;
  /* Gcc will issue a warning here. What to do with it? */
  pipe_handle = (HANDLE)(uintptr_t)pipe_fd;
  CreateThread(NULL, 0, parent_control_thread, (LPVOID)pipe_handle, 0, NULL);
}

int
main(int argc, char **argv)
{
  HANDLE stdi, stdo;
  BOOL b;
  wchar_t *commandlinew, **argvw;
  int argcw;
  int i;

  stdo = GetStdHandle(STD_OUTPUT_HANDLE);
  if (stdo == INVALID_HANDLE_VALUE || stdo == NULL)
    return 1;

  commandlinew = GetCommandLineW();
  argvw = CommandLineToArgvW(commandlinew, &argcw);
  if (argvw == NULL)
    return 1;

  install_parent_control_handler();

  for (i = 1; i < argcw || argcw == 1; i++)
    {
      DWORD r, w;
      int is_dash = wcscmp(NULL == argvw[i] ? L"-" : argvw[i], L"-") == 0;
      if (argcw == 1 || is_dash)
        {
          stdi = GetStdHandle(STD_INPUT_HANDLE);
          if (stdi == INVALID_HANDLE_VALUE)
            {
              fprintf(stderr, "cat: Failed to obtain stdin handle.\n");
              return 4;
            }
          if (stdi == NULL)
            {
              fprintf(stderr, "cat: Have no stdin.\n");
              return 5;
            }
        }
      else
        {
          stdi = CreateFileW(argvw[i], GENERIC_READ, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL);
          if (stdi == INVALID_HANDLE_VALUE)
            {
              wchar_t *msgbuf;
              DWORD le = GetLastError();
              if (0 < FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, 0, le, 0, (wchar_t *)&msgbuf, 0, NULL))
                {
                  fprintf(stderr, "cat: Failed to open file `%S'. Error %lu.\n", argvw[i], le);
                  return 3;
                }
              fprintf(stderr, "cat: Failed to open file `%S'. Error %lu: %S\n", argvw[i], le, msgbuf);
              if (msgbuf != NULL)
                LocalFree(msgbuf);
              return 2;
            }
        }
      do
        {
          unsigned char c;
          b = ReadFile(stdi, &c, 1, &r, NULL);
          if (b && r > 0)
            {
              b = WriteFile(stdo, &c, 1, &w, NULL);
              if (b == 0)
                {
                  wchar_t *msgbuf;
                  DWORD le = GetLastError();
                  if (0 < FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM, 0, le, 0, (wchar_t *)&msgbuf, 0, NULL))
                    {
                      fprintf(stderr, "cat: Failed to write into stdout. Error %lu.\n", le);
                      return 3;
                    }
                  fprintf(stderr, "cat: Failed to write into stdout. Error %lu: %S\n", le, msgbuf);
                  if (msgbuf != NULL)
                    LocalFree(msgbuf);
                  return 6;
                }
            }
        }
      while (b && r > 0);
      if (argcw == 1)
        break;
      if (!is_dash)
        CloseHandle(stdi);
    }
  LocalFree(argvw);
  return 0;
}