Reimplementing everything is not an option in C. But one should be able to pass string views directly to printf. The allocating version is what string_dup does

Reimplementing everything is not an option in C. But one should be able to pass string views directly to printf. The allocating version is what string_dup does. strv2cstr is certainly more dangerous. But as since the size is encoded in the return type, compilers can add bounds checking (and partially already do so).