[previous] 1851 [next] The %1s operand is 'essentially unsigned' (%2s) but will be implicitly converted to a signed type (%3s) in this bitwise operation.
Arithmetic type - Balancing

This message is issued whenever an expression of essentially unsigned type has been used as an operand of either &, | or ^ operators, and undergoes a usual arithmetic conversion to a signed integer type (the type of the other operand).

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 1851 --*/

int f1851 (unsigned char a, int b)
{
  b = b & a;                /* 1851 */

  return ((a - 1) | b) ;    /* 1851 */
}

MISRA-C:2004 Rules applicable to message 1851:

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
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