linux/scripts/coccinelle/api/kstrdup.cocci
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   1/// Use kstrdup rather than duplicating its implementation
   2///
   3// Confidence: High
   4// Copyright: (C) 2010 Nicolas Palix, DIKU.  GPLv2.
   5// Copyright: (C) 2010 Julia Lawall, DIKU.  GPLv2.
   6// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6.  GPLv2.
   7// URL: http://coccinelle.lip6.fr/
   8// Comments:
   9// Options: -no_includes -include_headers
  10
  11virtual patch
  12
  13@@
  14expression from,to;
  15expression flag,E1,E2;
  16statement S;
  17@@
  18
  19-  to = kmalloc(strlen(from) + 1,flag);
  20+  to = kstrdup(from, flag);
  21   ... when != \(from = E1 \| to = E1 \)
  22   if (to==NULL || ...) S
  23   ... when != \(from = E2 \| to = E2 \)
  24-  strcpy(to, from);
  25
  26@@
  27expression x,from,to;
  28expression flag,E1,E2,E3;
  29statement S;
  30@@
  31
  32-   x = strlen(from) + 1;
  33    ... when != \( x = E1 \| from = E1 \)
  34-   to = \(kmalloc\|kzalloc\)(x,flag);
  35+   to = kstrdup(from, flag);
  36    ... when != \(x = E2 \| from = E2 \| to = E2 \)
  37    if (to==NULL || ...) S
  38    ... when != \(x = E3 \| from = E3 \| to = E3 \)
  39-   memcpy(to, from, x);
  40