windows commandline tool to list (removable) drives

lsd.c

/* list drives */
/* Christoph Maurer */
/* 22.05.2009 */

#include <windows.h>
#include <stdio.h>

char * driveTypeText(char drive)
{
	char *rv = NULL;
	int drive_type = 0;
	char root_path[4];
	root_path[0] = drive;
	root_path[1] = ':';
	root_path[2] = '\\';
	root_path[3] = '\0';
	drive_type = GetDriveTypeA(root_path);
	switch (drive_type) {
		case DRIVE_UNKNOWN:
			rv = "UNKNOWN";
			break;
		case DRIVE_NO_ROOT_DIR:
			rv = "NO_ROOT_DIR";
			break;
		case DRIVE_REMOVABLE:
			rv = "REMOVEABLE";
			break;
		case DRIVE_FIXED:
			rv = "FIXED";
			break;
		case DRIVE_REMOTE:
			rv = "REMOTE";
			break;
		case DRIVE_CDROM:
			rv = "CDROM";
			break;
		case DRIVE_RAMDISK:
			rv = "RAMDISK";
			break;
		default:
			rv = "UNKNOWN";
			break;
	}
	return rv;
}

void usage(void)
{
	puts("Usage: lsd [/type]");
	puts("lsd - list drives\n");
	exit(0);
}

int main(int argc,char **argv)
{
	unsigned int drives_mask = GetLogicalDrives();
	unsigned int act_bit = 0;
	char drive_letter = 'A';
	int type = FALSE;

	if (argc==2) {
		if (!strcmp(argv[1],"/type")) {
			type = TRUE;
		} else  {
			usage();
		}
	} else if (argc>2) {
		usage();
	}
	
	if (drives_mask) {
		for (;act_bit<26;drive_letter++,act_bit++) {
			if (drives_mask & (1<<act_bit)) {
				if (type)
					printf("%c:\\\t%s\n",drive_letter,driveTypeText(drive_letter));
				else 
					printf("%c:\\\n",drive_letter);
			}
		}
	} else {
		fprintf(stderr,"Error calling GetLogicalDrives: GetLastError()=%d\n",GetLastError());
	}

	return 0;
}