1 6f4d00ee 2013-09-23 0intro #include <u.h>
2 6f4d00ee 2013-09-23 0intro #include <libc.h>
5 6f4d00ee 2013-09-23 0intro usage(void)
7 6f4d00ee 2013-09-23 0intro fprint(2, "usage: fossil/last disk\n");
8 6f4d00ee 2013-09-23 0intro exits("usage");
12 6f4d00ee 2013-09-23 0intro main(int argc, char **argv)
14 6f4d00ee 2013-09-23 0intro int fd, bs, addr;
15 6f4d00ee 2013-09-23 0intro char buf[20];
22 6f4d00ee 2013-09-23 0intro if(argc != 1)
25 6f4d00ee 2013-09-23 0intro if((fd = open(argv[0], OREAD)) < 0)
26 6f4d00ee 2013-09-23 0intro sysfatal("open %s: %r", argv[0]);
28 6f4d00ee 2013-09-23 0intro werrstr("end of file");
29 6f4d00ee 2013-09-23 0intro if(seek(fd, 131072, 0) < 0 || readn(fd, buf, 20) != 20)
30 6f4d00ee 2013-09-23 0intro sysfatal("error reading %s: %r", argv[0]);
31 6f4d00ee 2013-09-23 0intro fmtinstall('H', encodefmt);
32 6f4d00ee 2013-09-23 0intro if(memcmp(buf, "\x37\x76\xAE\x89", 4) != 0)
33 6f4d00ee 2013-09-23 0intro sysfatal("bad magic %.4H != 3776AE89", buf);
34 6f4d00ee 2013-09-23 0intro bs = buf[7]|(buf[6]<<8);
35 6f4d00ee 2013-09-23 0intro addr = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11];
36 6f4d00ee 2013-09-23 0intro if(seek(fd, (vlong)bs*addr+34, 0) < 0 || readn(fd, buf, 20) != 20)
37 6f4d00ee 2013-09-23 0intro sysfatal("error reading %s: %r", argv[0]);
38 6f4d00ee 2013-09-23 0intro print("vac:%.20lH\n", buf);