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authorBoris Kolpackov <boris@codesynthesis.com>2015-11-25 12:50:09 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2015-11-25 12:50:09 +0200
commit6a15c8431f8fbf078003a8f000f21e1968cb7da8 (patch)
tree311b4da467b406394ed66b09fd0af2eceaf2a983 /butl/fdstream
parent21a271ad96d1be5653c94fa81e32fcf3e2a957f1 (diff)
Implement ofdstream
Diffstat (limited to 'butl/fdstream')
-rw-r--r--butl/fdstream50
1 files changed, 38 insertions, 12 deletions
diff --git a/butl/fdstream b/butl/fdstream
index 01a19b7..2814d4b 100644
--- a/butl/fdstream
+++ b/butl/fdstream
@@ -6,18 +6,19 @@
#define BUTL_FDSTREAM
#include <istream>
+#include <ostream>
namespace butl
{
- // An input stream that is initialized with a file descriptor
- // rather than a file name.
+ // An iostream that is initialized with a file descriptor rather than
+ // a file name.
//
// Notes and limitations:
//
// - char only
- // - input only
+ // - input or output but not both
// - no support for put back
- // - throws std::system_error in case of a read() error
+ // - throws std::system_error in case of a read()/write() error
// - not movable, though can be easily supported
//
class fdbuf: public std::basic_streambuf<char>
@@ -35,17 +36,18 @@ namespace butl
close ();
void
- open (int fd) {close (); fd_ = fd; setg (buf_, buf_, buf_);}
+ open (int fd);
bool
is_open () const {return fd_ != -1;}
- // basic_streambuf input interface.
- //
public:
using int_type = std::basic_streambuf<char>::int_type;
using traits_type = std::basic_streambuf<char>::traits_type;
+ // basic_streambuf input interface.
+ //
+ public:
virtual std::streamsize
showmanyc ();
@@ -56,26 +58,50 @@ namespace butl
bool
load ();
+ // basic_streambuf output interface.
+ //
+ public:
+ virtual int_type
+ overflow (int_type);
+
+ virtual int
+ sync ();
+
+ private:
+ bool
+ save ();
+
private:
int fd_ = -1;
char buf_[2048];
};
- class ifdstream_base
+ class fdstream_base
{
protected:
- ifdstream_base () = default;
- ifdstream_base (int fd): buf_ (fd) {}
+ fdstream_base () = default;
+ fdstream_base (int fd): buf_ (fd) {}
protected:
fdbuf buf_;
};
- class ifdstream: ifdstream_base, public std::istream
+ class ifdstream: fdstream_base, public std::istream
{
public:
ifdstream (): std::istream (&buf_) {}
- ifdstream (int fd): ifdstream_base (fd), std::istream (&buf_) {}
+ ifdstream (int fd): fdstream_base (fd), std::istream (&buf_) {}
+
+ void close () {buf_.close ();}
+ void open (int fd) {buf_.open (fd);}
+ bool is_open () const {return buf_.is_open ();}
+ };
+
+ class ofdstream: fdstream_base, public std::ostream
+ {
+ public:
+ ofdstream (): std::ostream (&buf_) {}
+ ofdstream (int fd): fdstream_base (fd), std::ostream (&buf_) {}
void close () {buf_.close ();}
void open (int fd) {buf_.open (fd);}