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Fix RemoveRelatvePathComponents 

This used to return "/foo" for "../foo" when it should return the enpty
string (i.e., error removing all relative components).
This commit is contained in:
ShadowNinja 2016-12-16 17:35:58 -05:00 committed by Craig Robbins
parent 59f84ca0a0
commit f522e7351a
2 changed files with 23 additions and 17 deletions
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35
src/filesys.cpp
View File

@ -617,48 +617,51 @@ std::string RemoveRelativePathComponents(std::string path)
{
size_t pos = path.size();
size_t dotdot_count = 0;
while(pos != 0){
while (pos != 0) {
size_t component_with_delim_end = pos;
// skip a dir delimiter
while(pos != 0 && IsDirDelimiter(path[pos-1]))
while (pos != 0 && IsDirDelimiter(path[pos-1]))
pos--;
// strip a path component
size_t component_end = pos;
while(pos != 0 && !IsDirDelimiter(path[pos-1]))
while (pos != 0 && !IsDirDelimiter(path[pos-1]))
pos--;
size_t component_start = pos;
std::string component = path.substr(component_start,
component_end - component_start);
bool remove_this_component = false;
if(component == "." && component_start != 0){
if (component == ".") {
remove_this_component = true;
}
else if(component == ".."){
} else if (component == "..") {
remove_this_component = true;
dotdot_count += 1;
}
else if(dotdot_count != 0){
} else if (dotdot_count != 0) {
remove_this_component = true;
dotdot_count -= 1;
}
if(remove_this_component){
while(pos != 0 && IsDirDelimiter(path[pos-1]))
if (remove_this_component) {
while (pos != 0 && IsDirDelimiter(path[pos-1]))
pos--;
path = path.substr(0, pos) + DIR_DELIM +
path.substr(component_with_delim_end,
std::string::npos);
pos++;
if (component_start == 0) {
// We need to remove the delemiter too
path = path.substr(component_with_delim_end, std::string::npos);
} else {
path = path.substr(0, pos) + DIR_DELIM +
path.substr(component_with_delim_end, std::string::npos);
}
if (pos > 0)
pos++;
}
}
if(dotdot_count > 0)
if (dotdot_count > 0)
return "";
// remove trailing dir delimiters
pos = path.size();
while(pos != 0 && IsDirDelimiter(path[pos-1]))
while (pos != 0 && IsDirDelimiter(path[pos-1]))
pos--;
return path.substr(0, pos);
}

5
src/unittest/test_filepath.cpp
View File

@ -251,7 +251,10 @@ void TestFilePath::testRemoveRelativePathComponent()
UASSERT(result == p("/home/user/minetest/worlds/world1"));
path = p(".");
result = fs::RemoveRelativePathComponents(path);
UASSERT(result == ".");
UASSERT(result == "");
path = p("../a");
result = fs::RemoveRelativePathComponents(path);
UASSERT(result == "");
path = p("./subdir/../..");
result = fs::RemoveRelativePathComponents(path);
UASSERT(result == "");