70 	u_char *buffer;  in checkdirty()  local
80 	buffer = malloc(len = boot->bpbBytesPerSec);  in checkdirty()
81 	if (buffer == NULL) {  in checkdirty()
91 	if ((size_t)read(fs, buffer, boot->bpbBytesPerSec) !=  in checkdirty()
101 	if (buffer[0] != boot->bpbMedia || buffer[1] != 0xff)  in checkdirty()
104 		if ((buffer[2] & 0xf8) != 0xf8 || (buffer[3] & 0x3f) != 0x3f)  in checkdirty()
107 		if (buffer[2] != 0xff || (buffer[3] & 0x0f) != 0x0f  in checkdirty()
108 		    || (buffer[4] & 0xf8) != 0xf8 || buffer[5] != 0xff  in checkdirty()
109 		    || buffer[6] != 0xff || (buffer[7] & 0x03) != 0x03)  in checkdirty()
117 		if ((buffer[3] & 0xc0) == 0xc0)  in checkdirty()
120 		if ((buffer[7] & 0x0c) == 0x0c)  in checkdirty()
125 	free(buffer);  in checkdirty()
164 _readfat(int fs, struct bootblock *boot, u_int no, u_char **buffer)  in _readfat()  argument
169 	*buffer = malloc(len = boot->FATsecs * boot->bpbBytesPerSec);  in _readfat()
170 	if (*buffer == NULL) {  in _readfat()
183 	if ((size_t)read(fs, *buffer, boot->FATsecs * boot->bpbBytesPerSec)  in _readfat()
192 	free(*buffer);  in _readfat()
203 	u_char *buffer, *p;  in readfat()  local
210 	if (!_readfat(fs, boot, no, &buffer))  in readfat()
216 		free(buffer);  in readfat()
221 	if (buffer[0] != boot->bpbMedia  in readfat()
222 	    || buffer[1] != 0xff || buffer[2] != 0xff  in readfat()
223 	    || (boot->ClustMask == CLUST16_MASK && buffer[3] != 0xff)  in readfat()
225 		&& ((buffer[3]&0x0f) != 0x0f  in readfat()
226 		    || buffer[4] != 0xff || buffer[5] != 0xff  in readfat()
227 		    || buffer[6] != 0xff || (buffer[7]&0x0f) != 0x0f))) {  in readfat()
235 		if (buffer[0] == boot->bpbMedia && buffer[1] == 0xff  in readfat()
236 		    && buffer[2] == 0xff  in readfat()
237 		    && ((boot->ClustMask == CLUST16_MASK && buffer[3] == 0x7f)  in readfat()
239 			    && buffer[3] == 0x0f && buffer[4] == 0xff  in readfat()
240 			    && buffer[5] == 0xff && buffer[6] == 0xff  in readfat()
241 			    && buffer[7] == 0x07)))  in readfat()
250 				      buffer[0], buffer[1], buffer[2], buffer[3],  in readfat()
251 				      buffer[4], buffer[5], buffer[6], buffer[7]);  in readfat()
256 				    buffer[0], buffer[1], buffer[2], buffer[3]);  in readfat()
261 				    buffer[0], buffer[1], buffer[2]);  in readfat()
272 		p = buffer + 8;  in readfat()
275 		p = buffer + 4;  in readfat()
278 		p = buffer + 3;  in readfat()
311 	free(buffer);  in readfat()
560 	u_char *buffer, *p;  in writefat()  local
567 	buffer = malloc(fatsz = boot->FATsecs * boot->bpbBytesPerSec);  in writefat()
568 	if (buffer == NULL) {  in writefat()
572 	memset(buffer, 0, fatsz);  in writefat()
574 	p = buffer;  in writefat()
610 			free(buffer);  in writefat()
655 		    || (size_t)write(fs, buffer, fatsz) != fatsz) {  in writefat()
660 	free(buffer);  in writefat()