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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 "cmFileTimeComparison.h"
#include <string>
#include <time.h>
#include <unordered_map>
#include <utility>
// Use a platform-specific API to get file times efficiently.
#if !defined(_WIN32) || defined(__CYGWIN__)
#include "cm_sys_stat.h"
#define cmFileTimeComparison_Type struct stat
#else
#include "cmsys/Encoding.hxx"
#include <windows.h>
#define cmFileTimeComparison_Type FILETIME
#endif
class cmFileTimeComparisonInternal
{
public:
// Internal comparison method.
inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
bool FileTimesDiffer(const char* f1, const char* f2);
private:
typedef std::unordered_map<std::string, cmFileTimeComparison_Type>
FileStatsMap;
FileStatsMap Files;
// Internal methods to lookup and compare modification times.
inline bool Stat(const char* fname, cmFileTimeComparison_Type* st);
inline int Compare(cmFileTimeComparison_Type* st1,
cmFileTimeComparison_Type* st2);
inline bool TimesDiffer(cmFileTimeComparison_Type* st1,
cmFileTimeComparison_Type* st2);
};
bool cmFileTimeComparisonInternal::Stat(const char* fname,
cmFileTimeComparison_Type* st)
{
// Use the stored time if available.
cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
this->Files.find(fname);
if (fit != this->Files.end()) {
*st = fit->second;
return true;
}
#if !defined(_WIN32) || defined(__CYGWIN__)
// POSIX version. Use the stat function.
int res = ::stat(fname, st);
if (res != 0) {
return false;
}
#else
// Windows version. Get the modification time from extended file
// attributes.
WIN32_FILE_ATTRIBUTE_DATA fdata;
if (!GetFileAttributesExW(cmsys::Encoding::ToWide(fname).c_str(),
GetFileExInfoStandard, &fdata)) {
return false;
}
// Copy the file time to the output location.
*st = fdata.ftLastWriteTime;
#endif
// Store the time for future use.
this->Files[fname] = *st;
return true;
}
cmFileTimeComparison::cmFileTimeComparison()
{
this->Internals = new cmFileTimeComparisonInternal;
}
cmFileTimeComparison::~cmFileTimeComparison()
{
delete this->Internals;
}
bool cmFileTimeComparison::FileTimeCompare(const char* f1, const char* f2,
int* result)
{
return this->Internals->FileTimeCompare(f1, f2, result);
}
bool cmFileTimeComparison::FileTimesDiffer(const char* f1, const char* f2)
{
return this->Internals->FileTimesDiffer(f1, f2);
}
int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
cmFileTimeComparison_Type* s2)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
#if CMake_STAT_HAS_ST_MTIM
// Compare using nanosecond resolution.
if (s1->st_mtim.tv_sec < s2->st_mtim.tv_sec) {
return -1;
}
if (s1->st_mtim.tv_sec > s2->st_mtim.tv_sec) {
return 1;
}
if (s1->st_mtim.tv_nsec < s2->st_mtim.tv_nsec) {
return -1;
}
if (s1->st_mtim.tv_nsec > s2->st_mtim.tv_nsec) {
return 1;
}
#elif CMake_STAT_HAS_ST_MTIMESPEC
// Compare using nanosecond resolution.
if (s1->st_mtimespec.tv_sec < s2->st_mtimespec.tv_sec) {
return -1;
}
if (s1->st_mtimespec.tv_sec > s2->st_mtimespec.tv_sec) {
return 1;
}
if (s1->st_mtimespec.tv_nsec < s2->st_mtimespec.tv_nsec) {
return -1;
}
if (s1->st_mtimespec.tv_nsec > s2->st_mtimespec.tv_nsec) {
return 1;
}
#else
// Compare using 1 second resolution.
if (s1->st_mtime < s2->st_mtime) {
return -1;
}
if (s1->st_mtime > s2->st_mtime) {
return 1;
}
#endif
// Files have the same time.
return 0;
#else
// Compare using system-provided function.
return (int)CompareFileTime(s1, s2);
#endif
}
bool cmFileTimeComparisonInternal::TimesDiffer(cmFileTimeComparison_Type* s1,
cmFileTimeComparison_Type* s2)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
#if CMake_STAT_HAS_ST_MTIM
// Times are integers in units of 1ns.
long long bil = 1000000000;
long long t1 = s1->st_mtim.tv_sec * bil + s1->st_mtim.tv_nsec;
long long t2 = s2->st_mtim.tv_sec * bil + s2->st_mtim.tv_nsec;
if (t1 < t2) {
return (t2 - t1) >= bil;
}
if (t2 < t1) {
return (t1 - t2) >= bil;
}
return false;
#elif CMake_STAT_HAS_ST_MTIMESPEC
// Times are integers in units of 1ns.
long long bil = 1000000000;
long long t1 = s1->st_mtimespec.tv_sec * bil + s1->st_mtimespec.tv_nsec;
long long t2 = s2->st_mtimespec.tv_sec * bil + s2->st_mtimespec.tv_nsec;
if (t1 < t2) {
return (t2 - t1) >= bil;
}
if (t2 < t1) {
return (t1 - t2) >= bil;
}
return false;
#else
// Times are integers in units of 1s.
if (s1->st_mtime < s2->st_mtime) {
return (s2->st_mtime - s1->st_mtime) >= 1;
}
if (s1->st_mtime > s2->st_mtime) {
return (s1->st_mtime - s2->st_mtime) >= 1;
}
return false;
#endif
#else
// Times are integers in units of 100ns.
LARGE_INTEGER t1;
LARGE_INTEGER t2;
t1.LowPart = s1->dwLowDateTime;
t1.HighPart = s1->dwHighDateTime;
t2.LowPart = s2->dwLowDateTime;
t2.HighPart = s2->dwHighDateTime;
if (t1.QuadPart < t2.QuadPart) {
return (t2.QuadPart - t1.QuadPart) >= static_cast<LONGLONG>(10000000);
} else if (t2.QuadPart < t1.QuadPart) {
return (t1.QuadPart - t2.QuadPart) >= static_cast<LONGLONG>(10000000);
} else {
return false;
}
#endif
}
bool cmFileTimeComparisonInternal::FileTimeCompare(const char* f1,
const char* f2, int* result)
{
// Get the modification time for each file.
cmFileTimeComparison_Type s1;
cmFileTimeComparison_Type s2;
if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
// Compare the two modification times.
*result = this->Compare(&s1, &s2);
return true;
}
// No comparison available. Default to the same time.
*result = 0;
return false;
}
bool cmFileTimeComparisonInternal::FileTimesDiffer(const char* f1,
const char* f2)
{
// Get the modification time for each file.
cmFileTimeComparison_Type s1;
cmFileTimeComparison_Type s2;
if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
// Compare the two modification times.
return this->TimesDiffer(&s1, &s2);
}
// No comparison available. Default to different times.
return true;
}
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