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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmTimestamp.h"
#include <cstdlib>
#include <cstring>
#include <sstream>
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
std::string cmTimestamp::CurrentTime(const std::string& formatString,
bool utcFlag)
{
time_t currentTimeT = time(nullptr);
std::string source_date_epoch;
cmSystemTools::GetEnv("SOURCE_DATE_EPOCH", source_date_epoch);
if (!source_date_epoch.empty()) {
std::istringstream iss(source_date_epoch);
iss >> currentTimeT;
if (iss.fail() || !iss.eof()) {
cmSystemTools::Error("Cannot parse SOURCE_DATE_EPOCH as integer");
exit(27);
}
}
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)
{
std::string real_path =
cmSystemTools::GetRealPathResolvingWindowsSubst(path);
if (!cmsys::SystemTools::FileExists(real_path)) {
return std::string();
}
time_t mtime = cmsys::SystemTools::ModifiedTime(real_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 = nullptr;
if (utcFlag) {
ptr = gmtime(&timeT);
} else {
ptr = localtime(&timeT);
}
if (ptr == nullptr) {
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;
bool const tz_was_set = cmSystemTools::GetEnv("TZ", tz_old);
tz_old = "TZ=" + tz_old;
// 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);
# ifndef CMAKE_BOOTSTRAP
if (tz_was_set) {
cmSystemTools::PutEnv(tz_old);
} else {
cmSystemTools::UnsetEnv("TZ");
}
# else
// No UnsetEnv during bootstrap. This is good enough for CMake itself.
cmSystemTools::PutEnv(tz_old);
static_cast<void>(tz_was_set);
# endif
tzset();
return result;
#endif
}
std::string cmTimestamp::AddTimestampComponent(char flag,
struct tm& timeStruct,
const time_t timeT) const
{
std::string formatString = cmStrCat('%', flag);
switch (flag) {
case 'a':
case 'A':
case 'b':
case 'B':
case 'd':
case 'H':
case 'I':
case 'j':
case 'm':
case 'M':
case 'S':
case 'U':
case 'w':
case 'y':
case 'Y':
case '%':
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 against CMake");
return std::string();
}
return std::to_string(static_cast<long int>(difftime(timeT, unixEpoch)));
}
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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