264 lines
7.6 KiB
C++
264 lines
7.6 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#include "cmFileTimeComparison.h"
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// Use a hash table to avoid duplicate file time checks from disk.
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
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#include <unordered_map>
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#else
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#include <cmsys/hash_map.hxx>
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#endif
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#endif
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#include <cmsys/Encoding.hxx>
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// Use a platform-specific API to get file times efficiently.
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#if !defined(_WIN32) || defined(__CYGWIN__)
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#define cmFileTimeComparison_Type struct stat
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#include <ctype.h>
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#include <sys/stat.h>
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#else
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#define cmFileTimeComparison_Type FILETIME
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#include <windows.h>
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#endif
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class cmFileTimeComparisonInternal
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{
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public:
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// Internal comparison method.
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inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
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bool FileTimesDiffer(const char* f1, const char* f2);
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private:
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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// Use a hash table to efficiently map from file name to modification time.
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class HashString
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{
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public:
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size_t operator()(const std::string& s) const { return h(s.c_str()); }
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#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
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std::hash<const char*> h;
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#else
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cmsys::hash<const char*> h;
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#endif
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};
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#ifdef CMake_HAVE_CXX11_UNORDERED_MAP
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typedef std::unordered_map<std::string,
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#else
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typedef cmsys::hash_map<std::string,
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#endif
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cmFileTimeComparison_Type, HashString>
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FileStatsMap;
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FileStatsMap Files;
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#endif
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// Internal methods to lookup and compare modification times.
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inline bool Stat(const char* fname, cmFileTimeComparison_Type* st);
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inline int Compare(cmFileTimeComparison_Type* st1,
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cmFileTimeComparison_Type* st2);
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inline bool TimesDiffer(cmFileTimeComparison_Type* st1,
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cmFileTimeComparison_Type* st2);
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};
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bool cmFileTimeComparisonInternal::Stat(const char* fname,
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cmFileTimeComparison_Type* st)
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{
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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// Use the stored time if available.
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cmFileTimeComparisonInternal::FileStatsMap::iterator fit =
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this->Files.find(fname);
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if (fit != this->Files.end()) {
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*st = fit->second;
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return true;
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}
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#endif
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#if !defined(_WIN32) || defined(__CYGWIN__)
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// POSIX version. Use the stat function.
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int res = ::stat(fname, st);
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if (res != 0) {
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return false;
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}
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#else
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// Windows version. Get the modification time from extended file
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// attributes.
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WIN32_FILE_ATTRIBUTE_DATA fdata;
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if (!GetFileAttributesExW(cmsys::Encoding::ToWide(fname).c_str(),
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GetFileExInfoStandard, &fdata)) {
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return false;
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}
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// Copy the file time to the output location.
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*st = fdata.ftLastWriteTime;
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#endif
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#if defined(CMAKE_BUILD_WITH_CMAKE)
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// Store the time for future use.
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this->Files[fname] = *st;
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#endif
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return true;
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}
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cmFileTimeComparison::cmFileTimeComparison()
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{
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this->Internals = new cmFileTimeComparisonInternal;
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}
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cmFileTimeComparison::~cmFileTimeComparison()
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{
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delete this->Internals;
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}
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bool cmFileTimeComparison::FileTimeCompare(const char* f1, const char* f2,
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int* result)
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{
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return this->Internals->FileTimeCompare(f1, f2, result);
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}
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bool cmFileTimeComparison::FileTimesDiffer(const char* f1, const char* f2)
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{
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return this->Internals->FileTimesDiffer(f1, f2);
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}
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int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
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cmFileTimeComparison_Type* s2)
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{
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#if !defined(_WIN32) || defined(__CYGWIN__)
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#if CMake_STAT_HAS_ST_MTIM
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// Compare using nanosecond resolution.
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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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} else if (s1->st_mtim.tv_sec > s2->st_mtim.tv_sec) {
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return 1;
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} else if (s1->st_mtim.tv_nsec < s2->st_mtim.tv_nsec) {
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return -1;
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} else if (s1->st_mtim.tv_nsec > s2->st_mtim.tv_nsec) {
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return 1;
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}
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#elif CMake_STAT_HAS_ST_MTIMESPEC
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// Compare using nanosecond resolution.
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if (s1->st_mtimespec.tv_sec < s2->st_mtimespec.tv_sec) {
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return -1;
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} else if (s1->st_mtimespec.tv_sec > s2->st_mtimespec.tv_sec) {
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return 1;
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} else if (s1->st_mtimespec.tv_nsec < s2->st_mtimespec.tv_nsec) {
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return -1;
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} else if (s1->st_mtimespec.tv_nsec > s2->st_mtimespec.tv_nsec) {
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return 1;
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}
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#else
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// Compare using 1 second resolution.
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if (s1->st_mtime < s2->st_mtime) {
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return -1;
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} else if (s1->st_mtime > s2->st_mtime) {
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return 1;
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}
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#endif
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// Files have the same time.
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return 0;
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#else
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// Compare using system-provided function.
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return (int)CompareFileTime(s1, s2);
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#endif
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}
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bool cmFileTimeComparisonInternal::TimesDiffer(cmFileTimeComparison_Type* s1,
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cmFileTimeComparison_Type* s2)
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{
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#if !defined(_WIN32) || defined(__CYGWIN__)
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#if CMake_STAT_HAS_ST_MTIM
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// Times are integers in units of 1ns.
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long long bil = 1000000000;
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long long t1 = s1->st_mtim.tv_sec * bil + s1->st_mtim.tv_nsec;
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long long t2 = s2->st_mtim.tv_sec * bil + s2->st_mtim.tv_nsec;
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if (t1 < t2) {
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return (t2 - t1) >= bil;
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} else if (t2 < t1) {
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return (t1 - t2) >= bil;
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} else {
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return false;
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}
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#elif CMake_STAT_HAS_ST_MTIMESPEC
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// Times are integers in units of 1ns.
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long long bil = 1000000000;
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long long t1 = s1->st_mtimespec.tv_sec * bil + s1->st_mtimespec.tv_nsec;
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long long t2 = s2->st_mtimespec.tv_sec * bil + s2->st_mtimespec.tv_nsec;
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if (t1 < t2) {
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return (t2 - t1) >= bil;
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} else if (t2 < t1) {
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return (t1 - t2) >= bil;
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} else {
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return false;
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}
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#else
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// Times are integers in units of 1s.
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if (s1->st_mtime < s2->st_mtime) {
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return (s2->st_mtime - s1->st_mtime) >= 1;
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} else if (s1->st_mtime > s2->st_mtime) {
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return (s1->st_mtime - s2->st_mtime) >= 1;
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} else {
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return false;
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}
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#endif
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#else
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// Times are integers in units of 100ns.
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LARGE_INTEGER t1;
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LARGE_INTEGER t2;
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t1.LowPart = s1->dwLowDateTime;
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t1.HighPart = s1->dwHighDateTime;
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t2.LowPart = s2->dwLowDateTime;
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t2.HighPart = s2->dwHighDateTime;
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if (t1.QuadPart < t2.QuadPart) {
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return (t2.QuadPart - t1.QuadPart) >= static_cast<LONGLONG>(10000000);
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} else if (t2.QuadPart < t1.QuadPart) {
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return (t1.QuadPart - t2.QuadPart) >= static_cast<LONGLONG>(10000000);
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} else {
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return false;
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}
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#endif
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}
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bool cmFileTimeComparisonInternal::FileTimeCompare(const char* f1,
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const char* f2, int* result)
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{
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// Get the modification time for each file.
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cmFileTimeComparison_Type s1;
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cmFileTimeComparison_Type s2;
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if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
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// Compare the two modification times.
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*result = this->Compare(&s1, &s2);
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return true;
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} else {
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// No comparison available. Default to the same time.
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*result = 0;
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return false;
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}
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}
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bool cmFileTimeComparisonInternal::FileTimesDiffer(const char* f1,
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const char* f2)
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{
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// Get the modification time for each file.
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cmFileTimeComparison_Type s1;
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cmFileTimeComparison_Type s2;
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if (this->Stat(f1, &s1) && this->Stat(f2, &s2)) {
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// Compare the two modification times.
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return this->TimesDiffer(&s1, &s2);
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} else {
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// No comparison available. Default to different times.
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return true;
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}
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}
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