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Windows/Path.inc: [PR8460] Get rid of ScopedNullTerminator. Thanks to Zvi Rackover!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142785 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2011-10-24 03:27:19 +00:00
parent b068bbbaec
commit 5d0700786d
1 changed files with 9 additions and 18 deletions
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27
lib/Support/Windows/Path.inc
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@ -66,29 +66,20 @@ Path::operator=(StringRef that) {
return *this;
}
// push_back 0 on create, and pop_back on delete.
struct ScopedNullTerminator {
std::string &str;
ScopedNullTerminator(std::string &s) : str(s) { str.push_back(0); }
~ScopedNullTerminator() {
// str.pop_back(); But wait, C++03 doesn't have this...
assert(!str.empty() && str[str.size() - 1] == 0
&& "Null char not present!");
str.resize(str.size() - 1);
}
};
bool
Path::isValid() const {
if (path.empty())
return false;
size_t len = path.size();
// If there is a null character, it and all its successors are ignored.
size_t pos = path.find_first_of('\0');
if (pos != std::string::npos)
len = pos;
// If there is a colon, it must be the second character, preceded by a letter
// and followed by something.
size_t len = path.size();
// This code assumes that path is null terminated, so make sure it is.
ScopedNullTerminator snt(path);
size_t pos = path.rfind(':',len);
pos = path.rfind(':',len);
size_t rootslash = 0;
if (pos != std::string::npos) {
if (pos != 1 || !isalpha(path[0]) || len < 3)
@ -118,13 +109,13 @@ Path::isValid() const {
for (pos = 0; pos < len; ++pos) {
// A component may not end in a space.
if (path[pos] == ' ') {
if (path[pos+1] == '/' || path[pos+1] == '\0')
if (pos+1 == len || path[pos+1] == '/' || path[pos+1] == '\0')
return false;
}
// A component may not end in a period.
if (path[pos] == '.') {
if (path[pos+1] == '/' || path[pos+1] == '\0') {
if (pos+1 == len || path[pos+1] == '/') {
// Unless it is the pseudo-directory "."...
if (pos == 0 || path[pos-1] == '/' || path[pos-1] == ':')
return true;