#include <iomanip>
#include <iostream>
#include <sstream>
-#include <streambuf>
#include "misc.h"
#include "thread.h"
}
-/// Our fancy logging facility. The trick here is to replace cout.rdbuf() with
-/// this one that sends the output both to console and to a file, this allow us
-/// to toggle the logging of std::cout to a file while preserving output to
-/// stdout and without changing a single line of code! Idea and code from:
-/// http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
+/// Our fancy logging facility. The trick here is to replace cin.rdbuf() and
+/// cout.rdbuf() with this one that tees cin and cout to a file stream. We can
+/// toggle the logging of std::cout and std:cin at runtime while preserving i/o
+/// functionality and without changing a single line of code!
+/// Idea from http://groups.google.com/group/comp.lang.c++/msg/1d941c0f26ea0d81
-class Tee: public streambuf {
-public:
- typedef char_traits<char> traits_type;
- typedef traits_type::int_type int_type;
-
- Tee(ios& s, ofstream& f) : stream(s), file(f), stream_buf(s.rdbuf()) {}
- ~Tee() { set(false); }
-
- void set(bool b) { stream.rdbuf(b ? this : stream_buf); }
-
-private:
- int_type overflow(int_type c) {
-
- if (traits_type::eq_int_type(c, traits_type::eof()))
- return traits_type::not_eof(c);
-
- c = stream_buf->sputc(traits_type::to_char_type(c));
+class Logger: public streambuf {
- if (!traits_type::eq_int_type(c, traits_type::eof()))
- c = file.rdbuf()->sputc(traits_type::to_char_type(c));
+ Logger() : cinbuf(cin.rdbuf()), coutbuf(cout.rdbuf()) {}
+ ~Logger() { start(false); }
- return c;
- }
-
- int sync() {
-
- int c = stream_buf->pubsync();
+public:
+ static void start(bool b) {
- if (c != -1)
- c = file.rdbuf()->pubsync();
+ static Logger l;
- return c;
+ if (b && !l.file.is_open())
+ {
+ l.file.open("io_log.txt", ifstream::out | ifstream::app);
+ cin.rdbuf(&l);
+ cout.rdbuf(&l);
+ }
+ else if (!b && l.file.is_open())
+ {
+ cout.rdbuf(l.coutbuf);
+ cin.rdbuf(l.cinbuf);
+ l.file.close();
+ }
}
- int underflow() { return traits_type::not_eof(stream_buf->sgetc()); }
-
- int uflow() {
-
- int c = stream_buf->sbumpc();
-
- if (!traits_type::eq_int_type(c, traits_type::eof()))
- file.rdbuf()->sputc(traits_type::to_char_type(c));
-
- return traits_type::not_eof(c);
- }
+private:
+ int sync() { return file.rdbuf()->pubsync(), coutbuf->pubsync(); }
+ int overflow(int c) { return log(coutbuf->sputc((char)c), "<< ") ; }
+ int underflow() { return cinbuf->sgetc(); }
+ int uflow() { return log(cinbuf->sbumpc(), ">> "); }
- ios& stream;
- ofstream& file;
- streambuf* stream_buf;
-};
+ int log(int c, const char* prefix) {
-class Logger {
-public:
- Logger() : in(cin, file), out(cout, file) {}
- ~Logger() { set(false); }
+ static int last = '\n';
- void set(bool b) {
+ if (last == '\n')
+ file.rdbuf()->sputn(prefix, 3);
- if (b && !file.is_open())
- {
- file.open("io_log.txt", ifstream::out | ifstream::app);
- in.set(true);
- out.set(true);
- }
- else if (!b && file.is_open())
- {
- out.set(false);
- in.set(false);
- file.close();
- }
+ return last = file.rdbuf()->sputc((char)c);
}
private:
- Tee in, out;
ofstream file;
+ streambuf *cinbuf, *coutbuf;
};
-void logger_set(bool b) {
- static Logger l;
- l.set(b);
-}
+/// Trampoline helper to avoid moving Logger to misc.h header
+void start_logger(bool b) { Logger::start(b); }
/// cpu_count() tries to detect the number of CPU cores