Synopsis

Do not attempt to modify string literals.

Enabled by default

Yes

Severity/Certainty

Low/High

Full description

String literals are arrays of static storage duration. It is unspecified whether these arrays are distinct from each other. The behavior is undefined if a program attempts to modify any portion of a string literal.

Coding standards

Code examples

The following code example fails the check and will give a warning:

void example(void) {
    char *str  = "const";
    str[0] = 'C';
}

The following code example passes the check and will not give a warning about this issue:

void example(void) {
    char str[] = "string";
    str[0] = 'S';
}