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disk/partfs: minor bugfixes

--- a/sys/src/cmd/disk/partfs.c

+++ b/sys/src/cmd/disk/partfs.c

@@ -49,7 +49,7 @@

 	for (p = tab; p < tab + nelem(tab); p++)

 		if (p->inuse)

 			fmtprint(&fmt, "part %s %lld %lld\n",

-				p->name, p->offset, p->length);

+				p->name, p->offset, p->offset + p->length);

 	return fmtstrflush(&fmt);

 }

@@ -67,11 +67,14 @@

 		werrstr("partition name already in use");

 		return -1;

 	}

-	for (p = tab; p < tab + nelem(tab) && p->inuse; p++)

-		if (strcmp(p->name, name) == 0) {

+	for (p = tab; p < tab + nelem(tab); p++)

+		if (p->inuse && strcmp(p->name, name) == 0) {

 			werrstr("partition name already in use");

 			return -1;

 		}

+	for (p = tab; p < tab + nelem(tab); p++)

+		if (!p->inuse) 

+			break;

 	if(p == tab + nelem(tab)){

 		werrstr("no free partition slots");

 		return -1;