/*****

 AnaGram Programming Examples

 A Dos Script Language
 Redirection Class Definition

 Copyright 1993 Parsifal Software. All Rights Reserved.

 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.

 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.

*****/

#ifndef REDIRECT_H
#define REDIRECT_H
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>

#if defined(__MSDOS__) || defined(__WINDOWS__)
#include <io.h>
#else
#include <unistd.h>
#include <stdlib.h>
#define O_TEXT 0
#define O_BINARY 0
#define tell(fd) lseek(fd, 0, SEEK_CUR)
/* This is only meant to compile, not run. (Unix) */
#define filelength(fd) ((void)(fd), 0)
#endif

#define STDIN  0
#define STDOUT 1
#define STDERR 2

class redirect {
  int handle;                               // actual handle
  int old_handle;                           // old handle
  char name[L_tmpnam];                      // temporary name, if any
  int copy_flag;                            // is it live or is it memorex?
public:

// Constructors
  redirect(int h);
  redirect(int h, char *file_name, int append_flag = 0);
  redirect(redirect &);

// Reset
  friend redirect &reset(redirect &e) {
    lseek(e.handle,0,0);
    return e;
  }

// Destructor
  ~redirect();

// Save resultant file
  friend char *save_file(redirect &s);

// Extract contents
  friend char *content(redirect &s);
};

#endif