Pitfall for Developers: HFS+ Case-Sensitive

#include <CoreServices/CoreServices.h>

OSStatus getVRefNumFromPath (unsigned char * utf8Path, short * outVRefNum);

int main (int argc, const char * argv[]) {
OSStatus status;
HIOParam HFSParameterBlock;
GetVolParmsInfoBuffer volParamsInfoBuffer;
short vRefNum;

if (argc < 2) // If no parameters were given on the command line...
vRefNum = 0; // take the default volume
else
{
// Get the vRefnum from the paths.
// There are many other ways to get the vRefNum
// I leave that as an excercise to the reader
status = getVRefNumFromPath((unsigned char *)argv[1], &vRefNum);
if (status != noErr)
return status;
}

HFSParameterBlock.ioNamePtr = NULL;
HFSParameterBlock.ioVRefNum = vRefNum;
HFSParameterBlock.ioBuffer = (void*)&volParamsInfoBuffer;
HFSParameterBlock.ioReqCount = sizeof(GetVolParmsInfoBuffer);

status = PBHGetVolParmsSync ((HParmBlkPtr)&HFSParameterBlock);

if (status == noErr)
{
if (volParamsInfoBuffer.vMAttrib & bIsCaseSensitive == bIsCaseSensitive)
puts ("Volume is case-sensitive");
else
puts ("Volume is case-insensitive");
}
else
printf ("Error occured: %d", status);

return status;
}

OSStatus getVRefNumFromPath (unsigned char * utf8Path, short * outVRefNum)
{
OSStatus status;
FSRef myRef;
FSCatalogInfo myCatInfo;
FSSpec myFSSpec;

status = FSPathMakeRef (utf8Path, &myRef, NULL);
if (status == noErr)
status = FSGetCatalogInfo (&myRef, kFSCatInfoVolume, &myCatInfo, NULL, &myFSSpec, NULL);

if (status == noErr && outVRefNum != NULL)
*outVRefNum = myFSSpec.vRefNum; // Or myCatInfo.volume, they are the same

return status;
}