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std::string allocating getcwd

This commit is contained in:
Jack Andersen 2015-12-15 11:55:50 -10:00
parent 4240c79b58
commit 05eda24a81
2 changed files with 48 additions and 14 deletions
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48
hecl/include/HECL/HECL.hpp
View File

@ -194,6 +194,54 @@ static inline SystemChar* Getcwd(SystemChar* buf, int maxlen)
#endif
}
static SystemString GetcwdStr()
{
/* http://stackoverflow.com/a/2869667 */
const size_t ChunkSize=255;
const int MaxChunks=10240; // 2550 KiBs of current path are more than enough
SystemChar stackBuffer[ChunkSize]; // Stack buffer for the "normal" case
if (Getcwd(stackBuffer, sizeof(stackBuffer)) != nullptr)
return stackBuffer;
if (errno != ERANGE)
{
// It's not ERANGE, so we don't know how to handle it
LogModule.report(LogVisor::FatalError, "Cannot determine the current path.");
// Of course you may choose a different error reporting method
}
// Ok, the stack buffer isn't long enough; fallback to heap allocation
for (int chunks=2 ; chunks<MaxChunks ; chunks++)
{
// With boost use scoped_ptr; in C++0x, use unique_ptr
// If you want to be less C++ but more efficient you may want to use realloc
std::unique_ptr<SystemChar[]> cwd(new SystemChar[ChunkSize*chunks]);
if (Getcwd(cwd.get(), ChunkSize*chunks) != nullptr)
return cwd.get();
if (errno != ERANGE)
{
// It's not ERANGE, so we don't know how to handle it
LogModule.report(LogVisor::FatalError, "Cannot determine the current path.");
// Of course you may choose a different error reporting method
}
}
LogModule.report(LogVisor::FatalError, "Cannot determine the current path; the path is apparently unreasonably long");
return SystemString();
}
static inline bool IsAbsolute(const SystemString& path)
{
#if WIN32
if (path.size() && (path[0] == _S('\\') || path[0] == _S('/')))
return true;
if (path.size() >= 2 && iswalpha(path[0]) && path[1] == _S(':'))
return true;
#else
if (path.size() && path[0] == _S('/'))
return true;
#endif
return false;
}
enum class FileLockType
{
None = 0,

14
hecl/lib/ProjectPath.cpp
View File

@ -8,20 +8,6 @@ static const SystemRegex regGLOB(_S("\\*"), SystemRegex::ECMAScript|SystemRegex:
static const SystemRegex regPATHCOMP(_S("[/\\\\]*([^/\\\\]+)"), SystemRegex::ECMAScript|SystemRegex::optimize);
static const SystemRegex regDRIVELETTER(_S("^([^/]*)/"), SystemRegex::ECMAScript|SystemRegex::optimize);
static bool IsAbsolute(const SystemString& path)
{
#if WIN32
if (path.size() && (path[0] == _S('\\') || path[0] == _S('/')))
return true;
if (path.size() >= 2 && iswalpha(path[0]) && path[1] == _S(':'))
return true;
#else
if (path[0] == _S('/'))
return true;
#endif
return false;
}
static SystemString CanonRelPath(const SystemString& path)
{
/* Tokenize Path */