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instance method
IO#external_encoding
external_encoding → encoding or nil
io.c
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static VALUE
rb_io_external_encoding(VALUE io)
{
rb_io_t *fptr = rb_io_get_fptr(rb_io_taint_check(io));
if (fptr->encs.enc2) {
return rb_enc_from_encoding(fptr->encs.enc2);
}
if (fptr->mode & FMODE_WRITABLE) {
if (fptr->encs.enc)
return rb_enc_from_encoding(fptr->encs.enc);
return Qnil;
}
return rb_enc_from_encoding(io_read_encoding(fptr));
}