[previous] 4414 [next] An expression of 'essentially character' type (%1s) is being converted to unsigned type, '%2s' on assignment.
Arithmetic type - Assignment

This message is issued whenever an expression of essentially character type undergoes an assigning conversion to an unsigned integer type.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4414 --*/

void foo (unsigned b);

unsigned f4414 (char a)
{
  unsigned uia = a;         /* 4414 */

  foo (a + 1);              /* 4414 */

  uia = (a - 1);            /* 4414 */

  return a;                 /* 4414 */
}

MISRA-C:2004 Rules applicable to message 4414:

Rule  6.2  (Required) Signed and unsigned char type shall be used only for the storage and use of numeric values.
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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