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Improve current_zone().

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Fixes #454
This commit is contained in:
Howard Hinnant 2019-09-05 18:12:35 -04:00
parent e6d2c08159
commit 4481c75192
1 changed files with 19 additions and 9 deletions
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28
src/tz.cpp
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@ -3692,16 +3692,26 @@ tzdb::current_zone() const
CONSTDATA auto timezone = "/etc/localtime";
if (lstat(timezone, &sb) == 0 && S_ISLNK(sb.st_mode) && sb.st_size > 0) {
using namespace std;
string result;
char rp[PATH_MAX+1] = {};
if (readlink(timezone, rp, sizeof(rp)-1) > 0)
result = string(rp);
else
throw system_error(errno, system_category(), "readlink() failed");
const size_t pos = result.find(get_tz_dir());
if (pos != result.npos)
result.erase(0, get_tz_dir().size() + 1 + pos);
if (realpath(timezone, rp) == nullptr)
throw system_error(errno, system_category(), "realpath() failed");
#if HAS_STRING_VIEW
string_view result = rp;
CONSTDATA string_view zoneinfo = "/zoneinfo/";
const size_t pos = result.rfind(zoneinfo);
if (pos == result.npos)
throw runtime_error(
"current_zone() failed to find \"/zoneinfo/\" in " + string(result));
result.remove_prefix(pos + zoneinfo.size());
#else
string result = rp;
CONSTDATA char zoneinfo[] = "/zoneinfo/";
const size_t pos = result.rfind(zoneinfo);
if (pos == result.npos)
throw runtime_error(
"current_zone() failed to find \"/zoneinfo/\" in " + result);
result.erase(0, pos + sizeof(zoneinfo) - 1);
#endif
return locate_zone(result);
}
}