Category : C++ Source Code
Archive : VCCRT1.ZIP
Filename : OFSTREAM.CXX
Output of file : OFSTREAM.CXX contained in archive : VCCRT1.ZIP
*ofstream.cxx -
*
* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Contains the member functions for the ofstream class.
*
*******************************************************************************/
#include
#include
#include
#include
#include
#include
#pragma hdrstop
#include
/***
*ofstream::ofstream() - ofstream default constructor
*
*Purpose:
* Default constructor for ofstream objects.
*
*Entry:
* None.
*
*Exit:
* None.
*
*Exceptions:
*
*******************************************************************************/
ofstream::ofstream()
: ostream(new filebuf)
{
delbuf(1);
// CONSIDER: do anything else?
}
/***
*ofstream::ofstream(const char * name, int mode, int prot) - ofstream ctor
*
*Purpose:
* Constructor for ofstream objects. Creates an associated filebuf object,
* opens a named file and attaches it to the new filebuf.
*
*Entry:
* name = filename to open.
* mode = see filebuf::open mode argument. ios::out is implied.
* prot = see filebuf::open share argument
*
*Exit:
* None.
*
*Exceptions:
* Sets failbit if open fails.
*
*******************************************************************************/
ofstream::ofstream(const char * name, int mode, int prot)
: ostream(new filebuf)
{
delbuf(1);
if (!(rdbuf()->open(name, (mode|ios::out), prot)))
state |= ios::failbit;
}
/***
*ofstream::ofstream(filedesc fd) - ofstream constructor
*
*Purpose:
* Constructor for ofstream objects. Creates an associated filebuf object
* and attaches it to the given file descriptor.
*
*Entry:
* fd = file descriptor of file previously opened using _open or _sopen.
*
*Exit:
* None.
*
*Exceptions:
*
*******************************************************************************/
ofstream::ofstream(filedesc _fd)
: ostream(new filebuf(_fd))
{
delbuf(1);
}
/***
*ofstream::ofstream(filedesc fd, char * sbuf, int len) - ofstream constructor
*
*Purpose:
* Constructor for ofstream objects. Creates an associated filebuf object
* and attaches it to the given file descriptor. Filebuf object uses
* user-supplied buffer or is unbuffered if sbuf or len = 0.
*
*Entry:
* fd = file descriptor of file previously opened using _open or _sopen.
* sbuf = pointer to character buffer or NULL if request for unbuffered.
* len = lenght of character buffer sbuf or 0 if request for unbuffered.
*
*Exit:
* None.
*
*Exceptions:
*
*******************************************************************************/
ofstream::ofstream(filedesc _fd, char * sbuf, int len)
: ostream(new filebuf(_fd, sbuf, len))
{
delbuf(1);
}
/***
*ofstream::~ofstream() - ofstream destructor
*
*Purpose:
* ofstream destructor.
*
*Entry:
* None.
*
*Exit:
* None.
*
*Exceptions:
*
*******************************************************************************/
ofstream::~ofstream()
{
// CONSIDER: do anything else?
}
/***
*streambuf* ofstream::setbuf(char * ptr, int len) - setbuf function
*
*Purpose:
* ofstream setbuf function
*
*Entry:
* ptr = pointer to buffer or NULL for unbuffered.
* len = length of buffer or zero for unbuffered.
*
*Exit:
* Returns rdbuf() or NULL if error.
*
*Exceptions:
* If ofstream is already open or if rdbuf()->setbuf fails, sets failbit
* and returns NULL.
*
*******************************************************************************/
streambuf * ofstream::setbuf(char * ptr, int len)
{
if ((is_open()) || (!(rdbuf()->setbuf(ptr, len))))
{
state |= ios::failbit;
return NULL;
}
// UNDONE: turn off input buffer??
return rdbuf();
}
/***
*void ofstream::attach(filedesc _fd) - attach member function
*
*Purpose:
* ofstream attach member function. Just calls rdbuf()->attach().
*
*Entry:
* _fd = file descriptor of previously opened file.
*
*Exit:
* None.
*
*Exceptions:
* Sets failbit if rdbuf()->attach fails.
*
*******************************************************************************/
void ofstream::attach(filedesc _fd) // CONSIDER: inline?
{
if (!(rdbuf()->attach(_fd)))
state |= ios::failbit;
}
/***
*void ofstream::open(const char * name, int mode, int prot) - ofstream open()
*
*Purpose:
* Opens a named file and attaches it to the associated filebuf.
* Just calls rdbuf()->open().
*
*Entry:
* name = filename to open.
* mode = see filebuf::open mode argument. ios::out is implied.
* prot = see filebuf::open share argument
*
*Exit:
* None.
*
*Exceptions:
* Sets failbit if already open or rdbuf()->open() fails.
*
*******************************************************************************/
void ofstream::open(const char * name, int mode, int prot)
{
if (is_open() || !(rdbuf()->open(name, (mode|ios::out), prot)))
state |= ios::failbit;
}
/***
*void ofstream::close() - close member function
*
*Purpose:
* ofstream close member function. Just calls rdbuf()->close().
* Clears rdstate() error bits if successful.
*
*Entry:
* None.
*
*Exit:
* None.
*
*Exceptions:
* Sets failbit if rdbuf()->close fails.
*
*******************************************************************************/
void ofstream::close()
{
if (rdbuf()->close())
clear();
else
state |= ios::failbit;
}
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