tar/patches/tar-1.15.1-vfatTruncate.patch

   1 --- tar-1.15.1/src/system.c.vfatTruncate        2004-09-06 07:31:00.000000000 -0400
   2 +++ tar-1.15.1/src/system.c     2006-02-03 14:40:51.000000000 -0500
   3 @@ -272,8 +272,25 @@
   4  int
   5  sys_truncate (int fd)
   6  {
   7 +  struct stat st;
   8    off_t pos = lseek (fd, (off_t) 0, SEEK_CUR);
   9 -  return pos < 0 ? -1 : ftruncate (fd, pos);
  10 +
  11 +  if ( pos < 0)
  12 +    return -1;
  13 +
  14 +  if ( ftruncate(fd, pos) && errno == EPERM ) {
  15 +    /* wrapper around ftruncate:
  16 +     * ftruncate may fail to grow the size of a file with some OS and filesystem
  17 +     * combinations. Linux and vfat/fat is one example. If this is the case do
  18 +     * a write to grow the file to the desired length.
  19 +     */
  20 +    if( (fstat( fd, &st ) == -1) ||
  21 +        (st.st_size >= pos)  ||
  22 +        (lseek( fd, pos - 1, SEEK_SET) == (off_t)-1) ||
  23 +        (write( fd, "\0", 1) == -1) )
  24 +       return -1;
  25 +  }
  26 +  return 0;
  27  }
  28
  29  /* Return nonzero if NAME is the name of a regular file, or if the file