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man/reference-cfg-format.md: Update text about <not-uninit/>. When 'indirect' the indirection will be implicit according to our old rules.

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Daniel Marjamäki 2020-05-09 09:24:44 +02:00
parent 2c23a81470
commit 296a0adc97
1 changed files with 19 additions and 4 deletions
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man/reference-cfg-format.md
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@ -156,24 +156,39 @@ If you provide a configuration file then Cppcheck detects the bug:
Checking uninit.c... Checking uninit.c...
[uninit.c:5]: (error) Uninitialized variable: buffer2 [uninit.c:5]: (error) Uninitialized variable: buffer2
Note that this implies for pointers that the memory they point at has to be initialized, too. Below windows.cfg is shown:
Here is the minimal windows.cfg: Version 1:
<?xml version="1.0"?> <?xml version="1.0"?>
<def> <def>
<function name="CopyMemory"> <function name="CopyMemory">
<arg nr="1"/> <arg nr="1"/>
<arg nr="2"> <arg nr="2">
<not-null/>
<not-uninit/> <not-uninit/>
</arg> </arg>
<arg nr="3"/> <arg nr="3"/>
</function> </function>
</def> </def>
The `indirect` attribute can be set to control the indirection of uninitialized memory allowed. Setting `indirect` to `0` means no uninitialized memory is allowed. Setting it to `1` allows a pointer to uninitialized memory. Setting it to `2` allows a pointer to pointer to uninitialized memory. Version 2:
By default, cppcheck will use an indirect value of `0` unless `not-null` is used. When `not-null` is used, then `indirect` will default to `1`. <?xml version="1.0"?>
<def>
<function name="CopyMemory">
<arg nr="1"/>
<arg nr="2">
<not-uninit indirect="2"/>
</arg>
<arg nr="3"/>
</function>
</def>
Version 1: If `indirect` attribute is not used then the level of indirection is determined automatically. The `<not-null/>` tells Cppcheck that the pointer must be initialized. The `<not-uninit/>` tells Cppcheck to check 1 extra level. This configuration means that both the pointer and the data must be initialized.
Version 2: The `indirect` attribute can be set to explicitly control the level of indirection used in checking. Setting `indirect` to `0` means no uninitialized memory is allowed. Setting it to `1` allows a pointer to uninitialized memory. Setting it to `2` allows a pointer to pointer to uninitialized memory.
### Null pointers ### Null pointers