RfileFd.cpp

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// $Id: RfileFd.cpp 1180 2019-07-08 15:46:59Z mueller $
// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright 2019- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
//
// Revision History: 
// Date         Rev Version  Comment
// 2019-07-08  1180   1.1    add Open(fnam,flags,mode,emsg)
// 2019-06-15  1163   1.0    Initial version
// ---------------------------------------------------------------------------
 
#include <errno.h>
 
#include "RfileFd.hpp"
 
using namespace std;
 
// all method definitions in namespace Retro
namespace Retro {
 
//------------------------------------------+-----------------------------------
 
RfileFd::RfileFd()
  : RfileFd("RfileFd::")
{}
 
//------------------------------------------+-----------------------------------
 
RfileFd::RfileFd(const char* cnam)
  : Rfd(cnam)
{}
 
//------------------------------------------+-----------------------------------
 
bool RfileFd::Open(const char* fname, int flags, RerrMsg& emsg)
{
  Close();
  if (!SetFd(::open(fname, flags))) {
    emsg.InitErrno(fCnam+"Open()", 
                   string("open() for '") + fname + "' failed: ", errno);
  }
  return IsOpen();
}
 
//------------------------------------------+-----------------------------------
 
bool RfileFd::Open(const char* fname, int flags, mode_t mode, RerrMsg& emsg)
{
  Close();
  if (!SetFd(::open(fname, flags, mode))) {
    emsg.InitErrno(fCnam+"Open()", 
                   string("open() for '") + fname + "' failed: ", errno);
  }
  return IsOpen();
}
 
//------------------------------------------+-----------------------------------
 
bool RfileFd::Stat(struct stat *sbuf, RerrMsg& emsg)
{
  if (::fstat(fFd, sbuf) < 0) {
    emsg.InitErrno(fCnam+"Stat()", "stat() failed: ", errno);
    return false;
  }
  return true;
}
 
//------------------------------------------+-----------------------------------
 
off_t RfileFd::Seek(off_t offset, int whence, RerrMsg& emsg)
{
  if (::lseek(fFd, offset, whence) < 0) {
    emsg.InitErrno(fCnam+"Seek()", "seek() failed: ", errno);
    return false;
  }
  return true;
}
  
//------------------------------------------+-----------------------------------
 
bool RfileFd::Truncate(off_t length, RerrMsg& emsg)
{
  if (::ftruncate(fFd, length) < 0) {
    emsg.InitErrno(fCnam+"Truncate()", "ftruncate() failed: ", errno);
    return false;
  }
  return true;
}
 
//------------------------------------------+-----------------------------------
 
ssize_t RfileFd::Read(void *buf, size_t count, RerrMsg& emsg)
{
  ssize_t irc = ::read(fFd, buf, count);
  if (irc < 0) {
    emsg.InitErrno(fCnam+"Read()", "read() failed: ", errno);
  }
  return irc;
}
 
//------------------------------------------+-----------------------------------
 
bool RfileFd::WriteAll(const void *buf, size_t count, RerrMsg& emsg)
{
  ssize_t irc = ::write(fFd, buf, count);
  if (irc < ssize_t(count)) {
    emsg.InitErrno("WriteAll()", "write() failed: ", errno);
    return false;
  }
  return true;
}
 
} // end namespace Retro