QA·C Help - 2110

	2110	Default argument promotion : unsigned char promoted to signed int.

Arithmetic type - Integral promotion		REFERENCE - ISO:C90-6.3.2.2 Function Calls, 6.5.4.3 Function Declarators, 7.8.1 Variable argument list access macros

An expression of type unsigned char is being used as an argument in a function call and is being converted to type signed int according to the rules of default argument promotion.

This message will be generated if the function has not been declared or has been declared with an old style declaration. It will not be generated when default argument promotion results from a call to a function declared with a variable argument list.

For example:


/*PRQA S 1302,1303,3200,3209,3227,3408,3447,3602 ++*/

extern void f1(int n, unsigned char p);         /*              - new style function declaration   */
extern void f3();                               /* Message 3001 - old style function declaration   */
extern void f4(int n, ...);                     /*              - new style with variable arg list */

extern void foo(unsigned char uc)
{
    f1(1, uc);                                  /*                                      */
    f2(1, uc);                                  /* Message 2110 + 3335 - no declaration */
    f3(1, uc);                                  /* Message 2110                         */
    f4(1, uc);                                  /*                                      */
}

No MISRA C:2012 Rules applicable to message 2110