sys/src/cmd/hgfs/hgdb.c

   1 /* hg debug stuff, just dumps dirstate database right now */
   2
   3 #include <u.h>
   4 #include <libc.h>
   5 #include <thread.h>
   6 #include "dat.h"
   7 #include "fns.h"
   8
   9 char dothg[MAXPATH];
  10
  11 void
  12 main(int argc, char *argv[])
  13 {
  14         char buf[MAXPATH];
  15         uchar hdr[1+4+4+4+4];
  16         int n, fd;
  17
  18         ARGBEGIN {
  19         } ARGEND;
  20
  21         if(getdothg(dothg, *argv) < 0)
  22                 sysfatal("can't find .hg: %r");
  23
  24         snprint(buf, sizeof(buf), "%s/dirstate", dothg);
  25         if((fd = open(buf, OREAD)) < 0)
  26                 sysfatal("can't open dirstate: %r");
  27
  28         if(seek(fd, 0x28LL, 0) != 0x28LL)
  29                 sysfatal("can't seek dirstate: %r");
  30
  31         for(;;){
  32                 char state;
  33                 int mode, len;
  34                 vlong size;
  35                 long mtime;
  36
  37                 if((n = read(fd, hdr, sizeof(hdr))) == 0)
  38                         break;
  39                 if(n < 0)
  40                         sysfatal("read error: %r");
  41                 if(n < sizeof(hdr))
  42                         sysfatal("dirstate truncated");
  43
  44                 state = hdr[0];
  45                 mode = hdr[4] | hdr[3]<<8 | hdr[2]<<16 | hdr[1]<<24;
  46                 size = hdr[8] | hdr[7]<<8 | hdr[6]<<16 | hdr[5]<<24;
  47                 mtime = hdr[12] | hdr[11]<<8 | hdr[10]<<16 | hdr[9]<<24;
  48                 len = hdr[16] | hdr[15]<<8 | hdr[14]<<16 | hdr[13]<<24;
  49                 USED(mtime);
  50
  51                 if(len >= sizeof(buf))
  52                         sysfatal("invalid name length %d", len);
  53
  54                 n = read(fd, buf, len);
  55                 if(n < 0)
  56                         sysfatal("read error: %r");
  57                 if(n < len)
  58                         sysfatal("dirstate name truncated");
  59                 buf[n] = 0;
  60
  61
  62                 print("%c\t%o\t%lld\t%s\n", state, mode, size, buf);
  63         }
  64
  65         exits(0);
  66 }