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MISRA Discussion Forums > MISRA C > MISRA C:2012 and MISRA C:2023 guidelines > 8.11 Pointer type conversions > Rule 11.3
Full Version: Rule 11.3
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schileboh

31-01-2014, 09:47 AM
hello guys

i've a problem. i'm not sure if the following code is compliant to the Rule 11.3:

Code:
typedef struct SomeHeaderType
{
   uint8_t type;
   uint32_t timestamp;
   uint16_t some_attribute;
}SomeHeaderType;

void foo(uint8_t *buffer_ptr)
{
   SomeHeaderType *headerPtr = (SomeHeaderType*)buffer_ptr;
   if(headerPtr->type == 3)
   {
      uint16_t attribute = headerPtr->some_attribute;
      ...
   }
   ...
}

is it allowed to cast a 8-bit buffer pointer to a struct pointer? from my point of view, this code is not compliant, but i have some code examples here that do this and the code suggests to be MISRA conform...

thanks for clarification.

misra-c

20-02-2014, 08:46 AM
You are correct in saying that the cast from "pointer to unsigned 8-bit" to "pointer to struct" is not compliant with rule 11.3.
MISRA Discussion Forums > MISRA C > MISRA C:2012 and MISRA C:2023 guidelines > 8.11 Pointer type conversions > Rule 11.3