Function CopyConversionError

src/backend/commands/copyfromparse.c:501–550

* Report an encoding or conversion error. */

 * Report an encoding or conversion error.
 */
static void
CopyConversionError(CopyFromState cstate)
{
	Assert(cstate->raw_buf_len > 0);
	Assert(cstate->input_reached_error);

	if (!cstate->need_transcoding)
	{
		/*
		 * Everything up to input_buf_len was successfully verified, and
		 * input_buf_len points to the invalid or incomplete character.
		 */
		report_invalid_encoding(cstate->file_encoding,
								cstate->raw_buf + cstate->input_buf_len,
								cstate->raw_buf_len - cstate->input_buf_len);
	}
	else
	{
		/*
		 * raw_buf_index points to the invalid or untranslatable character. We
		 * let the conversion routine report the error, because it can provide
		 * a more specific error message than we could here.  An earlier call
		 * to the conversion routine in CopyConvertBuf() detected that there
		 * is an error, now we call the conversion routine again with
		 * noError=false, to have it throw the error.
		 */
		unsigned char *src;
		int			srclen;
		unsigned char *dst;
		int			dstlen;

		src = (unsigned char *) cstate->raw_buf + cstate->raw_buf_index;
		srclen = cstate->raw_buf_len - cstate->raw_buf_index;
		dst = (unsigned char *) cstate->input_buf + cstate->input_buf_len;
		dstlen = INPUT_BUF_SIZE - cstate->input_buf_len + 1;

		(void) pg_do_encoding_conversion_buf(cstate->conversion_proc,
											 cstate->file_encoding,
											 GetDatabaseEncoding(),
											 src, srclen,
											 dst, dstlen,
											 false);

		/*
		 * The conversion routine should have reported an error, so this
		 * should not be reached.
		 */
		elog(ERROR, "encoding conversion failed without error");
	}
}

/*
 * Load more data from data source to raw_buf.