LANG.STRUCT.SW.IF : Too Few Cases in switch

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CodeSonar^® 9.2p0

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CodeSecure Inc

C and C++

LANG.STRUCT.SW.IF : Too Few Cases in switch

Summary

A switch statement has fewer than two clauses.

This class is a strict subset of Malformed switch Statement.

If a switch statement exhibits multiple issues from the following list, the analysis may report only a subset of them.

Properties

Class Name

Too Few Cases in switch

Significance

style

Mnemonic

LANG.STRUCT.SW.IF

Categories

MisraC2025	MisraC2025:16.6	Every switch statement shall have at least two switch-clauses
MisraC2023	MisraC2023:16.6	Every switch statement shall have at least two switch-clauses
Misra2012	Misra2012:16.6	Every switch statement shall have at least two switch-clauses
Misra2004	Misra2004:15.5	Every switch statement shall have at least one case clause
AUTOSARC++14	AUTOSARC++14:A6-4-1	A switch statement shall have at least two case-clauses, distinct from the default label.
MisraC++2008	MisraC++2008:6-4-8	Every switch statement shall have at least one case-clause.
JSF++	JSF++:196	Every switch statement will have at least two cases and a potential default.

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="Too Few Cases in switch"

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

int lang_struct_sw_if(int i){
    int a = 0;

    switch (i){}               /* 'Too Few Cases in switch' warning issued here
                                * ('Empty switch Statement' also issued because body is empty)
                                */

    switch (i){                /* 'Too Few Cases in switch' warning issued here */
        case 1: {a++; break;}
    }

    switch (i){                /* 'Too Few Cases in switch' warning issued here
                                * ('Empty switch Statement' also issued because all cases share the same code)
                                */
        default:{ a++; break;}
    }
 
    switch (i){                                      /* contains two clauses */
        case 1: {a +=3; break;}
        default: {a++; break;}
    }

    return a;
}

Relevant Configuration File Parameters

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

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