uapp/fsck-msdosfs/boot.c

38 	u_char fsinfo[2 * DOSBOOTBLOCKSIZE];
97 		    || read(dosfs, fsinfo, sizeof fsinfo) != sizeof fsinfo) {
98 			perr("could not read fsinfo block");
101 		if (memcmp(fsinfo, "RRaA", 4)
102 		    || memcmp(fsinfo + 0x1e4, "rrAa", 4)
103 		    || fsinfo[0x1fc]
104 		    || fsinfo[0x1fd]
105 		    || fsinfo[0x1fe] != 0x55
106 		    || fsinfo[0x1ff] != 0xaa
107 		    || fsinfo[0x3fc]
108 		    || fsinfo[0x3fd]
109 		    || fsinfo[0x3fe] != 0x55
110 		    || fsinfo[0x3ff] != 0xaa) {
111 			pwarn("Invalid signature in fsinfo block\n");
113 				memcpy(fsinfo, "RRaA", 4);
114 				memcpy(fsinfo + 0x1e4, "rrAa", 4);
115 				fsinfo[0x1fc] = fsinfo[0x1fd] = 0;
116 				fsinfo[0x1fe] = 0x55;
117 				fsinfo[0x1ff] = 0xaa;
118 				fsinfo[0x3fc] = fsinfo[0x3fd] = 0;
119 				fsinfo[0x3fe] = 0x55;
120 				fsinfo[0x3ff] = 0xaa;
124 				    || write(dosfs, fsinfo, sizeof fsinfo)
125 				    != sizeof fsinfo) {
134 			boot->FSFree = fsinfo[0x1e8] + (fsinfo[0x1e9] << 8)
135 				       + (fsinfo[0x1ea] << 16)
136 				       + (fsinfo[0x1eb] << 24);
137 			boot->FSNext = fsinfo[0x1ec] + (fsinfo[0x1ed] << 8)
138 				       + (fsinfo[0x1ee] << 16)
139 				       + (fsinfo[0x1ef] << 24);
254 	u_char fsinfo[2 * DOSBOOTBLOCKSIZE];
258 	    || read(dosfs, fsinfo, sizeof fsinfo) != sizeof fsinfo) {
259 		perr("could not read fsinfo block");
262 	fsinfo[0x1e8] = (u_char)boot->FSFree;
263 	fsinfo[0x1e9] = (u_char)(boot->FSFree >> 8);
264 	fsinfo[0x1ea] = (u_char)(boot->FSFree >> 16);
265 	fsinfo[0x1eb] = (u_char)(boot->FSFree >> 24);
266 	fsinfo[0x1ec] = (u_char)boot->FSNext;
267 	fsinfo[0x1ed] = (u_char)(boot->FSNext >> 8);
268 	fsinfo[0x1ee] = (u_char)(boot->FSNext >> 16);
269 	fsinfo[0x1ef] = (u_char)(boot->FSNext >> 24);
272 	    || write(dosfs, fsinfo, sizeof fsinfo)
273 	    != sizeof fsinfo) {