feedc0de/date
1
0
Fork 0
forked from HowardHinnant/date
Code Pull Requests Activity

Try to make current time zone work with Linux. e.g. Ubuntu and Fedora

Browse Source
This commit is contained in:
gm
2015-07-28 03:29:58 +12:00
committed by Howard Hinnant
parent 5c370dbfd9
commit 51864f56c1
1 changed files with 31 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
tz.cpp
View File

@@ -1627,6 +1627,33 @@ operator<<(std::ostream& os, const Info& r)
const Zone*
current_timezone()
{
// On some versions of some linux distro's (e.g. Ubuntu),
// the current timezone might be in the first line of
// the /etc/timezone file. So we check that.
#if __linux
std::ifstream timezone_file("/etc/timezone");
if (timezone_file.is_open())
{
std::string line;
std::getline(timezone_file, line);
if (!line.empty())
return locate_zone(line);
// Fall through to try other means.
}
#endif
// On some OS's a file called /etc/localtime may
// exist and it may be either a real file
// containing time zone details or a symlink to such a file.
// On MacOS and BSD Unix if this file is a symlink it
// might resolve to a path like this:
// "/usr/share/zoneinfo/America/Los_Angeles"
// If it does, we try to determine the current
// timezone from the remainder of the path by removing the prefix
// and hoping the rest resolves to valid timezone.
// It may not always work though. If it doesn't then an
// exception will be thrown by local_timezone.
// The path may also take a relative form:
// "../usr/share/zoneinfo/America/Los_Angeles".
struct stat sb;
CONSTDATA auto timezone = "/etc/localtime";
if (lstat(timezone, &sb) == -1 || sb.st_size == 0)
@@ -1642,7 +1669,10 @@ current_timezone()
if (sz <= tmp)
break;
}
result.erase(0, 20);
if (result.compare(0, 20, "/usr/share/zoneinfo/")==0)
result.erase(0, 20);
else if (result.compare(0, 22, "../usr/share/zoneinfo/")==0)
result.erase(0, 22);
return locate_zone(result);
}