[previous] 4471 [next] A non-constant expression of 'essentially unsigned' type (%1s) is being passed to a function parameter of wider unsigned type, '%2s'.
Arithmetic type - Assignment

This message is issued whenever a non-constant expression of essentially unsigned type is bound to a function parameter of a wider unsigned integer type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4471 --*/

void foo (unsigned b);

void f4471 (unsigned short a)
{
  foo (a);                  /* 4471 */

  foo (a - 1);              /* 4471 */
}

For the purposes of QAC conversion messages, types are ordered according to the configured size (-s option), by default; hence for a typical 32 bit configuration, types int and long will be considered equivalent. However, when the -strictrank option is specified, types will be ordered according to their rank; consequently int will be considered narrower than long.

MISRA-C:2004 Rules applicable to message 4471:

Rule  10.1  (Required) The value of an expression of integer type shall not be implicitly converted to a different underlying type if: a) it is not a conversion to a wider integer type of the same signedness, or b) the expression is complex, or c) the expression is not constant and is a function argument, or d) the expression is not constant and is a return expression

QA·C Source Code Analyser 8.1
MISRA-C:2004 Compliance Module 3.2
© 2012 Programming Research.
www.programmingresearch.com 		Personality Groups | Glossary | Message Index | MISRA-C:2004 Rule Index Contents