#ifndef __EXCEPTIONS_H__
#define __EXCEPTIONS_H__
#ifdef __cplusplus

#include <stdio.h>
#include <unistd.h>
#include <stddef.h>
#include <string.h>
#include <stdlib.h>

class GeneralException;

char * xstrdup(const char *);
void * xmalloc(size_t) throw (GeneralException);
void xfree(void *&);
void * xrealloc(void *, size_t);
int xpipe(int *, int = 0) throw (GeneralException);
pid_t xfork() throw (GeneralException);

class String;

class Base {
  public:
    static char * strdup(const char * s) {
	return xstrdup(s);
    }
    static void * malloc(ssize_t s) {
	return xmalloc(s);
    }
    static void * realloc(void * p, size_t s) {
	return xrealloc(p, s);
    }
    static void * calloc(size_t n, size_t s) {
	return xmalloc(n * s);
    }
    void * operator new(size_t s) {
	return xmalloc(s);
    }
    void * operator new(size_t s, void * p) {
	return memset(p, 0, s);
    }
    void operator delete(void * p) {
	xfree(p);
    }
    static void free(void *& p) {
	xfree(p);
    }
    static void free(char *& p) {
	xfree((void *) p);
    }
    static int pipe(int * p, int flag = 0) {
	return xpipe(p, flag);
    }
    static pid_t fork() {
	return xfork();
    }
};

class GeneralException : public Base {
  public:
      GeneralException(String);
      GeneralException(const GeneralException &);
      ~GeneralException();
    char * GetMsg();

  protected:
      GeneralException();
    char * msg;
    static char t[BUFSIZ];
};

class MemoryException : public GeneralException {
  public:
      MemoryException(ssize_t);
};

enum op_t {
  IO_WRITE = 1,
  IO_READ
};

class IOGeneral : public GeneralException {
  public:
      IOGeneral(String);
  protected:
      IOGeneral();
};

class IOException : public IOGeneral {
  public:
      IOException(String, op_t, ssize_t);
};

class IOAgain : public IOGeneral {
  public:
      IOAgain();
};

class TaskSwitch : public GeneralException {
  public:
      TaskSwitch();
};

#include <String.h>

#else
#error This only works with a C++ compiler
#endif
#endif