CMake/Source/cmFileTimeComparison.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
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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.
============================================================================*/
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#include "cmFileTimeComparison.h"
#include <cmConfigure.h>
#include <string>
#include <time.h>
#include <utility>
// Use a hash table to avoid duplicate file time checks from disk.
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#if defined(CMAKE_BUILD_WITH_CMAKE)
#ifdef CMake_HAVE_CXX_UNORDERED_MAP
#include <unordered_map>
#else
#include <cmsys/hash_map.hxx>
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#endif
#endif
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// Use a platform-specific API to get file times efficiently.
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#if !defined(_WIN32) || defined(__CYGWIN__)
#include <sys/stat.h>
#define cmFileTimeComparison_Type struct stat
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#else
#include <cmsys/Encoding.hxx>
#include <windows.h>
#define cmFileTimeComparison_Type FILETIME
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#endif
class cmFileTimeComparisonInternal
{
public:
// Internal comparison method.
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inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
bool FileTimesDiffer(const char* f1, const char* f2);
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private:
#if defined(CMAKE_BUILD_WITH_CMAKE)
// Use a hash table to efficiently map from file name to modification time.
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class HashString
{
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public:
size_t operator()(const std::string& s) const { return h(s.c_str()); }
#ifdef CMake_HAVE_CXX_UNORDERED_MAP
std::hash<const char*> h;
#else
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cmsys::hash<const char*> h;
#endif
};
#ifdef CMake_HAVE_CXX_UNORDERED_MAP
typedef std::unordered_map<std::string,
#else
typedef cmsys::hash_map<std::string,
#endif
cmFileTimeComparison_Type, HashString>
FileStatsMap;
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FileStatsMap Files;
#endif
// Internal methods to lookup and compare modification times.
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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);
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};
bool cmFileTimeComparisonInternal::Stat(const char* fname,
cmFileTimeComparison_Type* st)
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{
#if defined(CMAKE_BUILD_WITH_CMAKE)
// Use the stored time if available.
cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
this->Files.find(fname);
if (fit != this->Files.end()) {
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*st = fit->second;
return true;
}
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#endif
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#if !defined(_WIN32) || defined(__CYGWIN__)
// POSIX version. Use the stat function.
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int res = ::stat(fname, st);
if (res != 0) {
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return false;
}
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#else
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// 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)) {
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return false;
}
// Copy the file time to the output location.
*st = fdata.ftLastWriteTime;
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#endif
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#if defined(CMAKE_BUILD_WITH_CMAKE)
// Store the time for future use.
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this->Files[fname] = *st;
#endif
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return true;
}
cmFileTimeComparison::cmFileTimeComparison()
{
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this->Internals = new cmFileTimeComparisonInternal;
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}
cmFileTimeComparison::~cmFileTimeComparison()
{
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delete this->Internals;
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}
bool cmFileTimeComparison::FileTimeCompare(const char* f1, const char* f2,
int* result)
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{
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return this->Internals->FileTimeCompare(f1, f2, result);
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}
bool cmFileTimeComparison::FileTimesDiffer(const char* f1, const char* f2)
{
return this->Internals->FileTimesDiffer(f1, f2);
}
int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
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cmFileTimeComparison_Type* s2)
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{
#if !defined(_WIN32) || defined(__CYGWIN__)
#if CMake_STAT_HAS_ST_MTIM
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// Compare using nanosecond resolution.
if (s1->st_mtim.tv_sec < s2->st_mtim.tv_sec) {
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return -1;
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}
if (s1->st_mtim.tv_sec > s2->st_mtim.tv_sec) {
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return 1;
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}
if (s1->st_mtim.tv_nsec < s2->st_mtim.tv_nsec) {
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return -1;
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}
if (s1->st_mtim.tv_nsec > s2->st_mtim.tv_nsec) {
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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;
} else if (s1->st_mtimespec.tv_sec > s2->st_mtimespec.tv_sec) {
return 1;
} else if (s1->st_mtimespec.tv_nsec < s2->st_mtimespec.tv_nsec) {
return -1;
} else if (s1->st_mtimespec.tv_nsec > s2->st_mtimespec.tv_nsec) {
return 1;
}
#else
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// Compare using 1 second resolution.
if (s1->st_mtime < s2->st_mtime) {
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return -1;
} else if (s1->st_mtime > s2->st_mtime) {
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return 1;
}
#endif
// Files have the same time.
return 0;
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#else
// Compare using system-provided function.
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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;
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}
if (t2 < t1) {
return (t1 - t2) >= bil;
}
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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;
} else if (t2 < t1) {
return (t1 - t2) >= bil;
} else {
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;
} else if (s1->st_mtime > s2->st_mtime) {
return (s1->st_mtime - s2->st_mtime) >= 1;
} else {
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)
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{
// Get the modification time for each file.
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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;
}
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// No comparison available. Default to the same time.
*result = 0;
return false;
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}
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);
}
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// No comparison available. Default to different times.
return true;
}