Previously to allocate a string with explicit length (ie. one which may contain \0 characters) in C code we have used:
strv = caml_alloc_string (count); memcpy (String_val (strv), str, count);
In OCaml 4.10 this doesn’t compile because String_val returns a ‘const char *’.
I could change String_val to Bytes_val, but that feels wrong. The runtime seems to use ‘&Byte_u (strv, 0)’.
It’s a shame there’s not a caml_copy_string_len function, but what is the proper way to do this for OCaml 4.10+, especially a way that won’t break in future and will be compatible with multicore?