According to MISRA 08, concatenation of wide and narrow string literals leads to undefined behavior.

Noncompliant Code Example

This noncompliant code example concatenates wide and narrow string literals. The behavior is undefined in this case.

wchar_t *msg = L"This message is very long, so I want to devide it "
                "into two parts.";

Compliant Solution (wide string literals)

This compliant solution concatenates wide string literals only.

wchar_t *msg = L"This message is very long, so I want to devide it "
               L"into two parts.";

Compliant Solution (narrow string literals)

If wide string literals are not necessary, it is better to use narrow string literals.

char* msg = "This message is very long, so I want to devide it "
            "into two parts.";

Risk Assessment

Concatenation of wide and narrow string literals leads to undefined behavior.

Rule

Severity

Likelihood

Remediation Cost

Priority

Level

ENV30-C

low

probable

medium

P4

L3

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

References

MISRA 08 Rule 2-13-5
ISO/IEC 14882-2003 2.13.4 String literals