LANG.STRUCT.LOOP.NOSTEP : Missing for-loop Step

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CodeSonar^® 9.2p0

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C and C++

LANG.STRUCT.LOOP.NOSTEP : Missing for-loop Step

Summary

The third ("step") clause of a for loop header is empty.

If all three clauses in the for loop header are empty, a Missing for-loop Step warning will not be issued.

Properties

Class Name

Missing for-loop Step

Significance

style

Mnemonic

LANG.STRUCT.LOOP.NOSTEP

Categories

MisraC2025	MisraC2025:14.2	A for loop shall be well-formed
MisraC2023	MisraC2023:14.2	A for loop shall be well-formed
Misra2012	Misra2012:14.2	A for loop shall be well-formed
Misra2004	Misra2004:13.5	The three expressions of a for statement shall be concerned only with loop control
	Misra2004:13.6	Numeric variables being used within a for loop for iteration counting shall not be modified in the body of the loop
MisraC++2023	MisraC++2023:9.5.1	Legacy for statements should be simple
JSF++	JSF++:200	Null initialize or increment expressions in for loops will not be used; a while loop will be used instead.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Missing for-loop Step"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

void g(void){return;}

int lang_struct_loop_nostep(void){
    int i;
    int rv=0;

    for ( ; ; ) {rv++; break;}                        /* specific exception */

    for (i = 0; i < 10; i++){ rv++; }                 /* third clause is present */

    for (i = 0; i < 10; g()){ i++; rv++; }            /* third clause is present */

    for (i = 0; i < 10; ){ i++; rv++; } /* 'Missing for-loop Step' warning issued here */

    for (i = 0; ; ){ rv++; break; }     /* 'Missing for-loop Step' warning issued here
                                         * ('Missing for-loop Termination' warning also issued if enabled)
                                         */
    return rv;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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