8 mkwidth(Disk *disk)  in mkwidth()  argument
12 	snprint(buf, sizeof buf, "%lld", disk->size);  in mkwidth()
13 	disk->width = strlen(buf);  in mkwidth()
14 	return disk;  in mkwidth()
59 partitiongeometry(Disk *disk)  in partitiongeometry()  argument
66 	if(disk->c == 0 || disk->h == 0 || disk->s == 0)  in partitiongeometry()
75 	rawname = malloc(strlen(disk->prefix) + 5);	/* prefix + "data" + nul */  in partitiongeometry()
79 	strcpy(rawname, disk->prefix);  in partitiongeometry()
92 		if(seek(disk->fd, 0, 0) < 0  in partitiongeometry()
93 		|| readn(disk->fd, buf, 512) != 512  in partitiongeometry()
122 	disk->h = h+1;	/* heads count from 0 */  in partitiongeometry()
123 	disk->s = s;	/* sectors count from 1 */  in partitiongeometry()
124 	disk->c = disk->secs / (disk->h*disk->s);  in partitiongeometry()
125 	disk->chssrc = Gpart;  in partitiongeometry()
133 drivergeometry(Disk *disk)  in drivergeometry()  argument
137 	if(disk->c == 0 || disk->h == 0 || disk->s == 0)  in drivergeometry()
140 	disk->chssrc = Gdisk;  in drivergeometry()
141 	if(disk->c < 1024)  in drivergeometry()
144 	switch(disk->h) {  in drivergeometry()
146 		disk->h = 255;  in drivergeometry()
147 		disk->c /= 17;  in drivergeometry()
151 		for(m = 2; m*disk->h < 256; m *= 2) {  in drivergeometry()
152 			if(disk->c/m < 1024) {  in drivergeometry()
153 				disk->c /= m;  in drivergeometry()
154 				disk->h *= m;  in drivergeometry()
160 		disk->h = 255;  in drivergeometry()
161 		disk->s = 63;  in drivergeometry()
162 		disk->c = disk->secs / (disk->h * disk->s);  in drivergeometry()
181 guessgeometry(Disk *disk)  in guessgeometry()  argument
186 	disk->chssrc = Gguess;  in guessgeometry()
189 		if(c*guess[i].h*guess[i].s >= disk->secs) {  in guessgeometry()
190 			disk->h = guess[i].h;  in guessgeometry()
191 			disk->s = guess[i].s;  in guessgeometry()
192 			disk->c = disk->secs / (disk->h * disk->s);  in guessgeometry()
197 	disk->h = 255;  in guessgeometry()
198 	disk->s = 63;  in guessgeometry()
199 	disk->c = disk->secs / (disk->h * disk->s);  in guessgeometry()
204 findgeometry(Disk *disk)  in findgeometry()  argument
206 	if(partitiongeometry(disk) < 0  in findgeometry()
207 	&& drivergeometry(disk) < 0  in findgeometry()
208 	&& guessgeometry(disk) < 0) {	/* can't happen */  in findgeometry()
215 openfile(Disk *disk)  in openfile()  argument
219 	if((d = dirfstat(disk->fd)) == nil){  in openfile()
220 		free(disk);  in openfile()
224 	disk->secsize = 512;  in openfile()
225 	disk->size = d->length;  in openfile()
226 	disk->secs = disk->size / disk->secsize;  in openfile()
227 	disk->offset = 0;  in openfile()
230 	findgeometry(disk);  in openfile()
231 	return mkwidth(disk);  in openfile()
235 opensd(Disk *disk)  in opensd()  argument
241 	Binit(&b, disk->ctlfd, OREAD);  in opensd()
246 			disk->secsize = strtoll(f[2], 0, 0);  in opensd()
248 				disk->c = strtol(f[3], 0, 0);  in opensd()
249 				disk->h = strtol(f[4], 0, 0);  in opensd()
250 				disk->s = strtol(f[5], 0, 0);  in opensd()
253 		if(nf >= 4 && strcmp(f[0], "part") == 0 && strcmp(f[1], disk->part) == 0) {  in opensd()
254 			disk->offset = strtoll(f[2], 0, 0);  in opensd()
255 			disk->secs = strtoll(f[3], 0, 0) - disk->offset;  in opensd()
260 	disk->size = disk->secs * disk->secsize;  in opensd()
261 	if(disk->size <= 0) {  in opensd()
262 		strcpy(disk->part, "");  in opensd()
263 		disk->type = Tfile;  in opensd()
264 		return openfile(disk);  in opensd()
267 	findgeometry(disk);  in opensd()
268 	return mkwidth(disk);  in opensd()
272 opendisk(char *disk, int rdonly, int noctl)  in opendisk()  argument
284 	d->fd = open(disk, OREAD);  in opendisk()
292 		d->wfd = open(disk, OWRITE);  in opendisk()
300 	p = malloc(strlen(disk) + 4);	/* 4: slop for "ctl\0" */  in opendisk()
307 	strcpy(p, disk);  in opendisk()
334 		d->part = strdup(disk+(q-p));  in opendisk()