demos/proc_info.cocci

   1 @ rule1 @
   2 identifier buffer, start, offset, length, inout, hostno;
   3 identifier hostptr;
   4 identifier proc_info_func;
   5 @@
   6   proc_info_func (
   7 +      struct Scsi_Host *hostptr,
   8        char *buffer, char **start, off_t offset, int length,
   9 -      int hostno,
  10        int inout) {
  11     ...
  12 -   struct Scsi_Host *hostptr;
  13     ...
  14 -   hostptr = scsi_host_hn_get(hostno);
  15     ...
  16 ?-  if (!hostptr) { ... return ...; }
  17     ...
  18 ?-  scsi_host_put(hostptr);
  19     ...
  20   }
  21
  22 //alt:
  23 //-  proc_info_func(char *buffer, char **start, off_t offset, int length,
  24 //-                 int hostno, int inout)
  25 //+ proc_info_func(struct Scsi_Host *hostptr, char *buffer, char **start,
  26 //+                off_t offset, int length, int inout)
  27 //{
  28
  29
  30
  31 @@
  32 identifier rule1.proc_info_func;
  33 identifier rule1.hostno;
  34 @@
  35   proc_info_func(...) {
  36     <...
  37 -   hostno
  38 +   hostptr->host_no
  39     ...>
  40   }
  41
  42 @@
  43 identifier func;
  44 expression buffer, start, offset, length, inout, hostno;
  45 identifier hostptr;
  46 identifier rule1.proc_info_func;
  47 @@
  48
  49  func(..., struct Scsi_Host *hostptr, ...) {
  50   <...
  51    proc_info_func(
  52 +       hostptr,
  53         buffer, start, offset, length,
  54 -       hostno,
  55         inout)
  56    ...>
  57  }