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Support/FileSystem: Implement bool equivalent(file_status A, file_status B);

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146364 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2011-12-12 06:04:28 +00:00
parent c3b00e8040
commit d45fbe6227
4 changed files with 79 additions and 84 deletions
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34
lib/Support/Unix/PathV2.inc
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@@ -273,28 +273,17 @@ error_code exists(const Twine &path, bool &result) {
return success;
}
bool equivalent(file_status A, file_status B) {
assert(status_known(A) && status_known(B));
return A.st_dev == B.st_dev &&
A.st_ino == B.st_ino;
}
error_code equivalent(const Twine &A, const Twine &B, bool &result) {
// Get arguments.
SmallString<128> a_storage;
SmallString<128> b_storage;
StringRef a = A.toNullTerminatedStringRef(a_storage);
StringRef b = B.toNullTerminatedStringRef(b_storage);
struct stat stat_a, stat_b;
int error_b = ::stat(b.begin(), &stat_b);
int error_a = ::stat(a.begin(), &stat_a);
// If both are invalid, it's an error. If only one is, the result is false.
if (error_a != 0 || error_b != 0) {
if (error_a == error_b)
return error_code(errno, system_category());
result = false;
} else {
result =
stat_a.st_dev == stat_b.st_dev &&
stat_a.st_ino == stat_b.st_ino;
}
file_status fsA, fsB;
if (error_code ec = status(A, fsA)) return ec;
if (error_code ec = status(B, fsB)) return ec;
result = equivalent(fsA, fsB);
return success;
}
@@ -341,6 +330,9 @@ error_code status(const Twine &path, file_status &result) {
else
result = file_status(file_type::type_unknown);
result.st_dev = status.st_dev;
result.st_ino = status.st_ino;
return success;
}