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// file : butl/timestamp.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <butl/timestamp>
#include <unistd.h> // stat
#include <sys/types.h> // stat
#include <sys/stat.h> // stat
#include <time.h> // localtime, gmtime, strftime
#include <ostream>
#include <system_error>
using namespace std;
namespace butl
{
// Figuring out whether we have the nanoseconds in some form.
//
template <typename S>
constexpr auto nsec (const S* s) -> decltype(s->st_mtim.tv_nsec)
{
return s->st_mtim.tv_nsec; // POSIX (GNU/Linux, Solaris).
}
template <typename S>
constexpr auto nsec (const S* s) -> decltype(s->st_mtimespec.tv_nsec)
{
return s->st_mtimespec.tv_nsec; // MacOS X.
}
template <typename S>
constexpr auto nsec (const S* s) -> decltype(s->st_mtime_n)
{
return s->st_mtime_n; // AIX 5.2 and later.
}
template <typename S>
constexpr int nsec (...) {return 0;}
timestamp
path_mtime (const path& p)
{
struct stat s;
if (stat (p.string ().c_str (), &s) != 0)
{
if (errno == ENOENT || errno == ENOTDIR)
return timestamp_nonexistent;
else
throw system_error (errno, system_category ());
}
return system_clock::from_time_t (s.st_mtime) +
chrono::duration_cast<duration> (
chrono::nanoseconds (nsec<struct stat> (&s)));
}
ostream&
operator<< (ostream& os, const timestamp& ts)
{
// @@ replace with put_time()
//
time_t t (system_clock::to_time_t (ts));
if (t == 0)
return os << "<nonexistent>";
std::tm tm;
if (localtime_r (&t, &tm) == nullptr)
throw system_error (errno, system_category ());
// If year is greater than 9999, we will overflow.
//
char buf[20]; // YYYY-MM-DD HH:MM:SS\0
if (strftime (buf, sizeof (buf), "%Y-%m-%d %H:%M:%S", &tm) == 0)
return os << "<beyond year 9999>";
os << buf;
using namespace chrono;
timestamp sec (system_clock::from_time_t (t));
nanoseconds ns (duration_cast<nanoseconds> (ts - sec));
if (ns != nanoseconds::zero ())
{
os << '.';
os.width (9);
os.fill ('0');
os << ns.count ();
}
return os;
}
ostream&
operator<< (ostream& os, const duration& d)
{
// @@ replace with put_time()
//
timestamp ts; // Epoch.
ts += d;
time_t t (system_clock::to_time_t (ts));
const char* fmt (nullptr);
const char* unt ("nanoseconds");
if (t >= 365 * 12 * 24 * 60 * 60)
{
fmt = "%Y-%m-%d %H:%M:%S";
unt = "years";
}
else if (t >= 12 * 24 * 60* 60)
{
fmt = "%m-%d %H:%M:%S";
unt = "months";
}
else if (t >= 24 * 60* 60)
{
fmt = "%d %H:%M:%S";
unt = "days";
}
else if (t >= 60 * 60)
{
fmt = "%H:%M:%S";
unt = "hours";
}
else if (t >= 60)
{
fmt = "%M:%S";
unt = "minutes";
}
else if (t >= 1)
{
fmt = "%S";
unt = "seconds";
}
if (fmt != nullptr)
{
std::tm tm;
if (gmtime_r (&t, &tm) == nullptr)
throw system_error (errno, system_category ());
char buf[20]; // YYYY-MM-DD HH:MM:SS\0
if (strftime (buf, sizeof (buf), fmt, &tm) == 0)
return os << "<beyond 9999>";
os << buf;
}
using namespace chrono;
timestamp sec (system_clock::from_time_t (t));
nanoseconds ns (duration_cast<nanoseconds> (ts - sec));
if (ns != nanoseconds::zero ())
{
if (fmt != nullptr)
{
os << '.';
os.width (9);
os.fill ('0');
}
os << ns.count () << ' ' << unt;
}
else if (fmt == 0)
os << '0';
return os;
}
}
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