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improve Path::makeUnique when mkstemp/mktemp are not available

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patch by Lasse Kärkkäinen in PR7404.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108110 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-07-12 00:09:55 +00:00
parent 7791080151
commit 1f01109254
1 changed files with 12 additions and 7 deletions
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17
lib/System/Unix/Path.inc
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@ -888,14 +888,19 @@ Path::makeUnique(bool reuse_current, std::string* ErrMsg) {
#else
// Okay, looks like we have to do it all by our lonesome.
static unsigned FCounter = 0;
unsigned offset = path.size() + 1;
while ( FCounter < 999999 && exists()) {
sprintf(FNBuffer+offset,"%06u",++FCounter);
path = FNBuffer;
}
if (FCounter > 999999)
// Try to initialize with unique value.
if (FCounter == 0) FCounter = ((unsigned)getpid() & 0xFFFF) << 8;
char* pos = strstr(FNBuffer, "XXXXXX");
do {
if (++FCounter > 0xFFFFFF) {
return MakeErrMsg(ErrMsg,
path + ": can't make unique filename: too many files");
}
sprintf(pos, "%06X", FCounter);
path = FNBuffer;
} while (exists());
// POSSIBLE SECURITY BUG: An attacker can easily guess the name and exploit
// LLVM.
#endif
return false;
}