Function htmlEncodeEntities 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn htmlEncodeEntities(
    out: *mut u8,
    outlen: *mut c_int,
    input: *const u8,
    inlen: *mut c_int,
    quoteChar: c_int,
) -> c_int

Take a block of UTF-8 chars in and try to convert it to an ASCII plus HTML entities block of chars out. Ported from archaeology/libxml2-git/HTMLparser.c htmlEncodeEntities.

Returns 0 if success, -2 if the transcoding fails, or -1 otherwise. inlen after return is the number of octets consumed; outlen the number of octets produced.

UPSTREAM-PARITY

int htmlEncodeEntities(unsigned char *out, int *outlen,
                       const unsigned char *in, int *inlen, int quoteChar);