iostream

UC Library Extensions UnderC comes with a pocket implementation of the standard C++ libraries, wh

// IOSTREAM
// 'fake' or 'pocket' iostreams...
// UnderC Development Project, 2001.
                               
#ifndef _IOSTREAM_H
#define _IOSTREAM_H
#ifdef _CONSOLE
  const bool USES_WCON = false;
#else
  const bool USES_WCON = true;
#endif

#ifdef __UNDERC__
 typedef void *FHandle; // this is the exported type of FILE *...
#else
 #include <stdio.h>
 #include <string.h> 
 typedef FILE *FHandle;	
 #define wcon_fscanf fscanf
#endif

const int MAX_LINE = 512;

namespace std {

namespace ios {
  enum { in=1,out=2,binary=4,app=8,ate=16,trunc=32,
         beg=0,end=2,cur=1
  };
}

typedef unsigned long streampos;

class base_stream {
public:
// these fields need to be public until friendship is sorted out!
  FHandle hand;
  bool m_redirect;

  bool open_file(const char *file, int access=ios::in)
  {
   if (file) {
      char mode[5],ch;
      int i = 0;
      if (access & ios::in) ch = 'r'; 
      if (access & ios::out) ch = 'w';
      if (access & ios::app)  ch = 'a';
      mode[i++] = ch;
      // *fix 1.2.3 ios::in | ios::out case not handled properly!
      // *fix 1.2.3b it's && not || !
      if (ch == 'r' && access & ios::out) {
           mode[i++] = 'w';
           mode[i++] = '+';
      }
      if (access & ios::binary) mode[i++] = 'b';
      mode[i] = '\0';
      hand = fopen(file,mode);
      m_redirect = false;
   } else hand = 0;
   return hand ? true : false;
  }

  void close()
   { if (hand) fclose(hand); }

  virtual void flush()
  { fflush(hand); }
};

class ostream: public base_stream { 
public:
  ostream(FHandle h=0)
  { hand = h; }  

  ostream& write(char *buff, int sz) {
    fwrite(buff,1,sz,hand);
    return *this;
  }
  
  bool good()
  { return hand ? true : false;  }
  
  bool bad()
  { return ! good(); }

  ostream& seekp(streampos pos, int which=ios::beg)
  { fseek(hand,pos,which); return *this; }

  streampos tellp()
  { return ftell(hand); }

};

class ofstream: public ostream {
public:
 bool open(const char *file, int access=0) {
   return open_file(file,access | ios::out);
 }

 ofstream(const char *file=0, int access=0)
 { open(file,access); }

 ~ofstream()
 { close(); }
};

class istream: public base_stream {
private:
  int m_no_read;
public:
  
  istream(FHandle h=0)
  { hand = h; m_redirect = USES_WCON; }

  istream& getline(char *buff,int sz)
  { char *s = fgets(buff,sz,hand);
    if (! m_redirect && s) s[strlen(s)-1] = '\0'; // remove \n!
    return *this;
  }

  istream& read(char *buff, int sz) {
    m_no_read = fread(buff,1,sz,hand);
    return *this;
  }

  istream& putback(char ch) {
    ungetc(ch, hand);
    return *this;
  }
  
  int gcount() { return m_no_read; }

  istream& write(char *buff, int sz) { // have to say ios::out as well!
    fwrite(buff,1,sz,hand);
    return *this;
  }

  istream& seekg(streampos pos, int which=ios::beg)
  { fseek(hand,pos,which); return *this; }

  streampos tellg()
  { return ftell(hand); }

  virtual bool eof()
  { return feof(hand); }

  bool good()
  { return hand ? (! eof()) : false;  }

  bool bad()
  { return ! good(); }

  bool operator! ()
  { return ! good(); }

  operator int () { return good(); }
}; 


class ifstream: public istream {
public:
  bool open(const char *str, int access=0) {
   return open_file(str,access | ios::in);
  }

 ifstream(const char *file=0, int access=0)
 {
   open(file,access);
 }

 ~ifstream()
 { close();    }
};

struct _Endl_ 
{ int t;  };

#ifdef __UNDERC__
ostream cout(_get_std_stream(2));
ostream cerr(_get_std_stream(3));
istream cin(_get_std_stream(1));
#else
ostream cout(stdout);
ostream cerr(stderr);
istream cin(stdin);
#endif

_Endl_ endl;

} // namespace std

// *fiddle 0.9.4  All operator overloading must be kept in global
// until we've sorted out cross-namespace overloading.

std::ostream& operator<< (std::ostream& os, int val)
{ fprintf(os.hand,"%d",val); return os; }

std::ostream& operator<< (std::ostream& os, long val)
{ fprintf(os.hand,"%d",val); return os; }

std::ostream& operator<< (std::ostream& os, unsigned int val)
{ fprintf(os.hand,"%u",val); return os; }

std::ostream& operator<< (std::ostream& os, unsigned long val)
{ fprintf(os.hand,"%u",val); return os; }

std::ostream& operator<< (std::ostream& os, bool val)
{ fprintf(os.hand,"%s",val ? "true" : "false"); return os; }

std::ostream& operator<< (std::ostream& os, double val)
{ fprintf(os.hand,"%lf",val); return os; }

//*SJD* Curious that printf() is expecting a float as a double...

std::ostream& operator<< (std::ostream& os, float val)
{ fprintf(os.hand,"%lf",(double)val); return os; }

std::ostream& operator<< (std::ostream& os, const char *val)
{ fprintf(os.hand,"%s",val); return os; }

std::ostream& operator << (std::ostream& os, std::_Endl_& e)
{ 
 fprintf(os.hand,"\n");
 os.flush();
 return os;
}

std::ostream& operator<< (std::ostream& os, void *val)
{ fprintf(os.hand,"%x",val); return os; }

std::ostream& operator<< (std::ostream& os, char ch)
{ fprintf(os.hand,"%c",ch);  return os; }

std::istream& operator>> (std::istream& is, int& val)
{ 
if (is.m_redirect) wcon_fscanf(is.hand,"%d",&val);
else
 fscanf(is.hand,"%d",&val);
return is;
}

std::istream& operator>> (std::istream& is, double& val)
{
 if (is.m_redirect) wcon_fscanf(is.hand,"%lf",&val);
 else
 fscanf(is.hand,"%lf",&val);
 return is;
}

std::istream& operator>> (std::istream& is, float& val)
{
 if (is.m_redirect) wcon_fscanf(is.hand,"%f",&val);
 else
 fscanf(is.hand,"%f",&val);
 return is;
}

std::istream& operator>> (std::istream& is, const char *val)
{
 if (is.m_redirect) wcon_fscanf(is.hand,"%s",val);
 else
 fscanf(is.hand,"%s",val);
 return is;
}

std::istream& operator>> (std::istream& is, char& ch)
{ 
 if (is.m_redirect) wcon_fscanf(is.hand,"%c",&ch);
 else
 fscanf(is.hand,"%c",&ch);
 return is;
}

std::istream& operator>> (std::istream& is, void*& ptr)
{
 if (is.m_redirect) wcon_fscanf(is.hand,"%x",&ptr);
 else
 fscanf(is.hand,"%x",&ptr);
 return is;
}


#endif