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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2012 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmTimestamp.h"
#include <cstring>
#include <cstdlib>
#include <sys/types.h>
#include <sys/stat.h>
#include <sstream>
//----------------------------------------------------------------------------
std::string cmTimestamp::CurrentTime(
const std::string& formatString, bool utcFlag)
{
time_t currentTimeT = time(0);
if(currentTimeT == time_t(-1))
{
return std::string();
}
return CreateTimestampFromTimeT(currentTimeT, formatString, utcFlag);
}
//----------------------------------------------------------------------------
std::string cmTimestamp::FileModificationTime(const char* path,
const std::string& formatString, bool utcFlag)
{
if(!cmsys::SystemTools::FileExists(path))
{
return std::string();
}
time_t mtime = cmsys::SystemTools::ModifiedTime(path);
return CreateTimestampFromTimeT(mtime, formatString, utcFlag);
}
//----------------------------------------------------------------------------
std::string cmTimestamp::CreateTimestampFromTimeT(time_t timeT,
std::string formatString, bool utcFlag) const
{
if(formatString.empty())
{
formatString = "%Y-%m-%dT%H:%M:%S";
if(utcFlag)
{
formatString += "Z";
}
}
struct tm timeStruct;
memset(&timeStruct, 0, sizeof(timeStruct));
struct tm* ptr = (struct tm*) 0;
if(utcFlag)
{
ptr = gmtime(&timeT);
}
else
{
ptr = localtime(&timeT);
}
if(ptr == 0)
{
return std::string();
}
timeStruct = *ptr;
std::string result;
for(std::string::size_type i = 0; i < formatString.size(); ++i)
{
char c1 = formatString[i];
char c2 = (i + 1 < formatString.size()) ?
formatString[i + 1] : static_cast<char>(0);
if(c1 == '%' && c2 != 0)
{
result += AddTimestampComponent(c2, timeStruct, timeT);
++i;
}
else
{
result += c1;
}
}
return result;
}
//----------------------------------------------------------------------------
time_t cmTimestamp::CreateUtcTimeTFromTm(struct tm &tm) const
{
#if defined(_MSC_VER) && _MSC_VER >= 1400
return _mkgmtime(&tm);
#else
// From Linux timegm() manpage.
std::string tz_old = "TZ=";
if (const char* tz = cmSystemTools::GetEnv("TZ"))
{
tz_old += tz;
}
// The standard says that "TZ=" or "TZ=[UNRECOGNIZED_TZ]" means UTC.
// It seems that "TZ=" does NOT work, at least under Windows
// with neither MSVC nor MinGW, so let's use explicit "TZ=UTC"
cmSystemTools::PutEnv("TZ=UTC");
tzset();
time_t result = mktime(&tm);
cmSystemTools::PutEnv(tz_old);
tzset();
return result;
#endif
}
//----------------------------------------------------------------------------
std::string cmTimestamp::AddTimestampComponent(
char flag, struct tm& timeStruct, const time_t timeT) const
{
std::string formatString = "%";
formatString += flag;
switch(flag)
{
case 'd':
case 'H':
case 'I':
case 'j':
case 'm':
case 'M':
case 'S':
case 'U':
case 'w':
case 'y':
case 'Y':
break;
case 's': // Seconds since UNIX epoch (midnight 1-jan-1970)
{
// Build a time_t for UNIX epoch and substract from the input "timeT":
struct tm tmUnixEpoch;
memset(&tmUnixEpoch, 0, sizeof(tmUnixEpoch));
tmUnixEpoch.tm_mday = 1;
tmUnixEpoch.tm_year = 1970-1900;
const time_t unixEpoch = this->CreateUtcTimeTFromTm(tmUnixEpoch);
if (unixEpoch == -1)
{
cmSystemTools::Error("Error generating UNIX epoch in "
"STRING(TIMESTAMP ...). Please, file a bug report aginst CMake");
return std::string();
}
std::stringstream ss;
ss << static_cast<long int>(difftime(timeT, unixEpoch));
return ss.str();
}
default:
{
return formatString;
}
}
char buffer[16];
size_t size = strftime(buffer, sizeof(buffer),
formatString.c_str(), &timeStruct);
return std::string(buffer, size);
}
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