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ENH: Add method cmFileTimeComparison::FileTimesDiffer to check if file times differ by 1 second or more.

This commit is contained in:
Brad King 2008-01-03 00:01:38 -05:00
parent 8ca81ae7bf
commit 38ed52fe14
2 changed files with 96 additions and 0 deletions
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90
Source/cmFileTimeComparison.cxx
View File

@ -38,6 +38,8 @@ public:
// Internal comparison method.
inline bool FileTimeCompare(const char* f1, const char* f2, int* result);
bool FileTimesDiffer(const char* f1, const char* f2);
private:
#if defined(CMAKE_BUILD_WITH_CMAKE)
// Use a hash table to efficiently map from file name to modification time.
@ -59,6 +61,8 @@ private:
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);
};
//----------------------------------------------------------------------------
@ -123,6 +127,12 @@ bool cmFileTimeComparison::FileTimeCompare(const char* f1,
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)
@ -165,6 +175,66 @@ int cmFileTimeComparisonInternal::Compare(cmFileTimeComparison_Type* s1,
#endif
}
//----------------------------------------------------------------------------
bool cmFileTimeComparisonInternal::TimesDiffer(cmFileTimeComparison_Type* s1,
cmFileTimeComparison_Type* s2)
{
#if !defined(_WIN32) || defined(__CYGWIN__)
# if cmsys_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;
}
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,
@ -187,3 +257,23 @@ bool cmFileTimeComparisonInternal::FileTimeCompare(const char* f1,
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);
}
else
{
// No comparison available. Default to different times.
return true;
}
}

6
Source/cmFileTimeComparison.h
View File

@ -40,6 +40,12 @@ public:
*/
bool FileTimeCompare(const char* f1, const char* f2, int* result);
/**
* Compare file modification times. Return true unless both files
* exist and have modification times less than 1 second apart.
*/
bool FileTimesDiffer(const char* f1, const char* f2);
protected:
cmFileTimeComparisonInternal* Internals;