Category : C++ Source Code
Archive : VCCRT1.ZIP
Filename : FILEBUF1.CXX
Output of file : FILEBUF1.CXX contained in archive : VCCRT1.ZIP
*filebuf1.cxx - non-core filebuf member functions.
*
* Copyright (c) 1991-1992, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Contains optional member functions for filebuf class.
*
*******************************************************************************/
#include
#include
#include
#include
#include
#include
#include
#include
#pragma hdrstop
#include
/***
*filebuf* filebuf::attach(filedesc fd) - filebuf attach function
*
*Purpose:
* filebuf attach() member function. Attach filebuf object to the
* given file descriptor previously obtained from _open() or _sopen().
*
*Entry:
* fd = file descriptor.
*
*Exit:
* Returns this pointer or NULL if error.
*
*Exceptions:
* Returns NULL if fd = -1.
*
*******************************************************************************/
filebuf* filebuf::attach(filedesc fd)
{
if (x_fd!=-1)
return NULL; // error if already attached
x_fd = fd;
if ((fd!=-1) && (!unbuffered()) && (!ebuf()))
{
char * sbuf = new char[BUFSIZ];
if (!sbuf)
{
unbuffered(1);
}
else
{
streambuf::setb(sbuf,sbuf+BUFSIZ,1);
}
}
return this;
}
/***
*filebuf* filebuf::open(const char* name, int mode, int share) - filebuf open
*
*Purpose:
* filebuf open() member function. Open a file and attach to filebuf
* object.
*
*Entry:
* name = file name string.
* mode = open mode: Combination of ios:: in, out, binary, nocreate, app,
* ate, noreplace and trunc. See spec. for details on behavior.
* share = share mode (optional). sh_compat, sh_none, sh_read, sh_write.
*
*Exit:
* Returns this pointer or NULL if error.
*
*Exceptions:
* Returns NULL if filebuf is already attached to an open file, or if
* invalid mode options, or if call to _sopen or filebuf::seekoff() fails.
*
*******************************************************************************/
filebuf* filebuf::open(const char* name, int mode, int share)
{
int dos_mode;
int smode;
if (x_fd!=-1)
return NULL; // error if already open
// translate mode argument
dos_mode = (mode & ios::binary) ? O_BINARY : O_TEXT;
if (!(mode & ios::nocreate))
dos_mode |= O_CREAT;
if (mode & ios::noreplace)
dos_mode |= O_EXCL;
if (mode & ios::app)
{
mode |= ios::out;
dos_mode |= O_APPEND;
}
if (mode & ios::trunc)
{
mode |= ios::out; // IMPLIED
dos_mode |= O_TRUNC;
}
if (mode & ios::out)
{
if (mode & ios::in)
{
dos_mode |= O_RDWR;
}
else
{
dos_mode |= O_WRONLY;
}
// CONSIDER: a bit weaker treatment than in spec.
if (!(mode & (ios::in|ios::app|ios::ate)))
{
mode |= ios::trunc; // IMPLIED
dos_mode |= O_TRUNC;
}
}
else if (mode & ios::in)
dos_mode |= O_RDONLY;
else
return NULL; // error if not ios:in or ios::out
smode = (_osmode==_OS2_MODE) ? _SH_DENYNO : _SH_COMPAT; // default
share &= (sh_read|sh_write|sh_none|sh_compat); // ignore other bits
if (share) // optimization openprot serves as default
{
switch (share)
{
// case sh_compat :
case 03000 :
smode = _SH_COMPAT;
break;
// case sh_none :
case 04000 :
smode = _SH_DENYRW;
break;
// case sh_read :
case 05000 :
smode = _SH_DENYWR;
break;
// case sh_write :
case 06000 :
smode = _SH_DENYRD;
break;
// case (sh_read|sh_write) :
case 07000 :
smode = _SH_DENYNO;
break;
default : // unrecognized value same as default
break;
};
}
x_fd = _sopen(name, dos_mode, smode, S_IREAD|S_IWRITE);
if (x_fd==-1)
return NULL;
x_fOpened = 1;
if ((!unbuffered()) && (!ebuf()))
{
char * sbuf = new char[BUFSIZ];
if (!sbuf)
{
unbuffered(1);
}
else
{
streambuf::setb(sbuf,sbuf+BUFSIZ,1);
}
}
if (mode & ios::ate)
if (seekoff(0,ios::end,mode)==EOF)
{
close();
return NULL;
}
return this;
}
/***
*int filebuf::setmode(int mode) - filebuf setmode function
*
*Purpose:
* filebuf setmode() member function. Set binary or text access mode.
* Calls _setmode().
*
* MS-specific extension.
*
*Entry:
* mode = filebuf::binary or filebuf::text.
*
*Exit:
* Returns previous mode, or -1 error.
*
*Exceptions:
* Return -1 (EOF) if invalid argument or _setmode fails.
*
*******************************************************************************/
int filebuf::setmode(int mode)
{
if ((mode!=filebuf::binary) && (mode!=filebuf::text))
return -1;
if ((x_fd==-1) || (sync()==EOF))
return -1;
return _setmode(x_fd,mode);
}
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