check_wine_WtoA.c

   1 /*
   2  * sparse/check_template.c
   3  *
   4  * Copyright (C) 2009 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * Idea from Michael Stefaniuc and Vincent Béron's earlier WtoA
  12  * check.
  13  *
  14  * Apparently when you are coding WINE, you are not allowed to call
  15  * functions that end in capital 'A' from functions that end in
  16  * capital 'W'
  17  *
  18  */
  19
  20 #include "smatch.h"
  21
  22 static int my_id;
  23
  24 static int in_w = 0;
  25
  26 static void match_function_def(struct symbol *sym)
  27 {
  28         char *func = get_function();
  29         int len = strlen(func);
  30
  31         if (func[len - 1] == 'W' && len > 2 && func[len - 2] != 'A' )
  32                 in_w = 1;
  33         else
  34                 in_w = 0;
  35 }
  36
  37 static int allowed_func(const char *fn)
  38 {
  39         if (!strcmp("lstrcatA", fn))
  40                 return 1;
  41         if (!strcmp("lstrcpyA", fn))
  42                 return 1;
  43         if (!strcmp("lstrcpynA", fn))
  44                 return 1;
  45         if (!strcmp("lstrlenA", fn))
  46                 return 1;
  47         return 0;
  48 }
  49
  50 static void match_call(struct expression *expr)
  51 {
  52         char *fn_name;
  53         int len;
  54
  55         if (!in_w)
  56                 return;
  57
  58         fn_name = get_variable_from_expr(expr->fn, NULL);
  59         if (!fn_name)
  60                 goto free;
  61         len = strlen(fn_name);
  62         if (fn_name[len - 1] == 'A' && !allowed_func(fn_name)) {
  63                 sm_msg("warn: WtoA call %s()", fn_name);
  64         }
  65 free:
  66         free_string(fn_name);
  67 }
  68
  69 void check_wine_WtoA(int id)
  70 {
  71         if (option_project != PROJ_WINE)
  72                 return;
  73
  74         my_id = id;
  75         add_hook(&match_function_def, FUNC_DEF_HOOK);
  76         add_hook(&match_call, FUNCTION_CALL_HOOK);
  77 }