sys/src/cmd/hgfs/info.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <thread.h>
   4 #include "dat.h"
   5 #include "fns.h"
   6
   7 Revinfo*
   8 loadrevinfo(Revlog *changelog, int rev)
   9 {
  10         char buf[BUFSZ], *p, *e;
  11         int fd, line, eof, inmsg, n;
  12         Revinfo *ri;
  13         vlong off;
  14
  15         if((fd = revlogopentemp(changelog, rev)) < 0)
  16                 return nil;
  17
  18         off = fmetaheader(fd);
  19         seek(fd, off, 0);
  20
  21         ri = malloc(sizeof(*ri));
  22         memset(ri, 0, sizeof(*ri));
  23
  24         memmove(ri->chash, changelog->map[rev].hash, HASHSZ);
  25
  26         eof = 0;
  27         line = 0;
  28         inmsg = 0;
  29         p = buf;
  30         e = buf + BUFSZ;
  31         while(eof == 0){
  32                 if((n = read(fd, p, e - p)) < 0)
  33                         break;
  34                 if(n == 0){
  35                         eof = 1;
  36                         *p = '\n';
  37                         n++;
  38                 }
  39                 p += n;
  40                 while((p > buf) && (e = memchr(buf, '\n', p - buf))){
  41                         *e++ = 0;
  42
  43                         switch(line++){
  44                         case 0:
  45                                 hex2hash(buf, ri->mhash);
  46                                 break;
  47                         case 1:
  48                                 ri->who = strdup(buf);
  49                                 break;
  50                         case 2:
  51                                 ri->when = strtol(buf, nil, 10);
  52                                 break;
  53                         case 3:
  54                                 ri->logoff = off;
  55                         default:
  56                                 if(!inmsg){
  57                                         if(*buf == 0){
  58                                                 ri->loglen = off - ri->logoff;
  59                                                 inmsg = 1;
  60                                         }
  61                                 } else {
  62                                         n = ri->why ? strlen(ri->why) : 0;
  63                                         ri->why = realloc(ri->why, n + strlen(buf)+2);
  64                                         if(n > 0) ri->why[n++] = '\n';
  65                                         strcpy(ri->why + n, buf);
  66                                 }
  67                         }
  68                         n = e - buf;
  69                         p -= n;
  70                         if(p > buf)
  71                                 memmove(buf, e, p - buf);
  72                         off += n;
  73                 }
  74                 e = buf + BUFSZ;
  75         }
  76         close(fd);
  77
  78         return ri;
  79 }