Create directory but only when not running from floppy-CodePudding

I'm trying to get my application to create a directory if it doesn't exist, but only if the application isn't running from a floppy drive. I'm making the assumption that drives A: and B: are floppies.

The code I'm using is as follows:

char drive[_MAX_PATH];
char dir[_MAX_DIR];
char filen[_MAX_FNAME];
char ext[_MAX_EXT];
char SourcePath[_MAX_PATH];

_splitpath( ProgramPath, drive, dir, filen, ext );
strcpy( SourcePath, drive );
strcat( SourcePath, dir );
strcat( SourcePath, "SYSBAK" );

if ( toupper( drive[0] ) != 'A' || toupper( drive[0] != 'B' ) {
    if ( !FolderExist( SourcePath ) ) {
        try {
            _mkdir( SourcePath );
        }
        catch( ... ) {
            // do nothing
        }
    }
}

I have also tried:

if ( stricmp( drive, "A:" ) != 0 || stricmp( drive, "B:" ) != 0 ) {

and:

if ( !(stricmp( drive, "A:" ) == 0) || !(stricmp( drive, "B:" ) == 0) ) {

and yet when I compile and run from a floppy, the directory still gets created. I've confirmed using printf that drive[0] is indeed equal to A when running from floppy drive A:. ProgramPath is defined earlier in the application as argv[0].

Can anybody tell me what I'm doing wrong? What is the correct code?

CodePudding user response：

You have "typos", in particular, your || should be &&:

toupper(drive[0]) != 'A' && toupper(drive[0]) != 'B'

which is equivalent to

!(toupper(drive[0]) == 'A' || toupper(drive[0]) == 'B')