[previous] 4464 [next] A constant expression of 'essentially unsigned' type (%1s) is being converted to narrower unsigned type, '%2s' on assignment.
Arithmetic type - Assignment

This message is issued whenever a constant expression of essentially unsigned type undergoes an assigning conversion to a narrower unsigned integer type. Note that the message will not be generated for a constant.

For example: 


/*PRQA S 1-9999 ++*/
/*PRQA S 4464 --*/

void foo (unsigned char b);

unsigned char f4464 (void)
{
  unsigned char uca = (255u + 1u); /* 4464 */

  foo (255u + 1u);                 /* 4464 */

  uca = (128u * 2u);               /* 4464 */

  return (512u / 2u);              /* 4464 */
}

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 4464:

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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