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const char *p;
void dont_do_this(void) {
    const char str[] = ""This will change"";
    p = str; /* dangerous */
    /* ... */
}

void innocuous(void) {
    const char str[] = ""Surprise, surprise"";
}
/* ... */
dont_do_this();
innocuous();
/* p might be pointing to ""Surprise, surprise"" */

void this_is_OK(void) {
    const char str[] = ""Everything OK"";
    const char *p = str;
    /* ... */
}
/* p is inaccessible outside the scope of string str */

const char *p;
void is_this_OK(void) {
    const char str[] = ""Everything OK?"";
    p = str;
    /* ... */
    p = NULL;
}