sprintf

What it does

Multiple checks for sprintf():

checks whether the fmt argument is a constant string (in which case sprintf() is not needed);
checks whether there is a mismatch between the number of special characters and the number of arguments;
checks whether the fmt argument contains invalid special characters.

For 1, using sprintf() with a constant string, e.g. sprintf("abc"), is useless and less readable. This has a safe fix that extracts the string.

For 2, a mismatch between the number of special characters and the number of arguments would generate a runtime error or a warning:

if the number of special characters > number of arguments, it errors, e.g. sprintf("%s %s", "a");
otherwise, it warns, e.g. sprintf("%s", "a", "b").

For 3, passing invalid special characters would error at runtime, e.g. sprintf("%y", "a").

Cases 2 and 3 do not have an automatic fix.

sprintf("abc")
sprintf("%s %s", "a") # would error
sprintf("%y", "a") # would error

Use instead:

"abc"

See ?sprintf