Split copy.c into four files.

Copy.c has grown really large. Split it into more manageable parts:

- copy.c now contains only a few functions that are common to COPY FROM
  and COPY TO.

- copyto.c contains code for COPY TO.

- copyfrom.c contains code for initializing COPY FROM, and inserting the
  tuples to the correct table.

- copyfromparse.c contains code for reading from the client/file/program,
  and parsing the input text/CSV/binary format into tuples.

All of these parts are fairly complicated, and fairly independent of each
other. There is a patch being discussed to implement parallel COPY FROM,
which will add a lot of new code to the COPY FROM path, and another patch
which would allow INSERTs to use the same multi-insert machinery as COPY
FROM, both of which will require refactoring that code. With those two
patches, there's going to be a lot of code churn in copy.c anyway, so now
seems like a good time to do this refactoring.

The CopyStateData struct is also split. All the formatting options, like
FORMAT, QUOTE, ESCAPE, are put in a new CopyFormatOption struct, which
is used by both COPY FROM and TO. Other state data are kept in separate
CopyFromStateData and CopyToStateData structs.

Reviewed-by: Soumyadeep Chakraborty, Erik Rijkers, Vignesh C, Andres Freund
Discussion: https://www.postgresql.org/message-id/8e15b560-f387-7acc-ac90-763986617bfb%40iki.fi

1 files changed, 1616 insertions, 0 deletions

diff --git a/src/backend/commands/copyfromparse.c b/src/backend/commands/copyfromparse.c
new file mode 100644
index 00000000000..2eb08a260ca
--- /dev/null
+++ b/src/backend/commands/copyfromparse.c
@@ -0,0 +1,1616 @@
+/*-------------------------------------------------------------------------
+ *
+ * copyfromparse.c
+ *		Parse CSV/text/binary format for COPY FROM.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/commands/copyfromparse.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <ctype.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "commands/copy.h"
+#include "commands/copyfrom_internal.h"
+#include "executor/executor.h"
+#include "libpq/libpq.h"
+#include "libpq/pqformat.h"
+#include "mb/pg_wchar.h"
+#include "miscadmin.h"
+#include "port/pg_bswap.h"
+#include "utils/memutils.h"
+#include "utils/rel.h"
+
+#define ISOCTAL(c) (((c) >= '0') && ((c) <= '7'))
+#define OCTVALUE(c) ((c) - '0')
+
+/*
+ * These macros centralize code used to process line_buf and raw_buf buffers.
+ * They are macros because they often do continue/break control and to avoid
+ * function call overhead in tight COPY loops.
+ *
+ * We must use "if (1)" because the usual "do {...} while(0)" wrapper would
+ * prevent the continue/break processing from working.  We end the "if (1)"
+ * with "else ((void) 0)" to ensure the "if" does not unintentionally match
+ * any "else" in the calling code, and to avoid any compiler warnings about
+ * empty statements.  See http://www.cit.gu.edu.au/~anthony/info/C/C.macros.
+ */
+
+/*
+ * This keeps the character read at the top of the loop in the buffer
+ * even if there is more than one read-ahead.
+ */
+#define IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(extralen) \
+if (1) \
+{ \
+	if (raw_buf_ptr + (extralen) >= copy_buf_len && !hit_eof) \
+	{ \
+		raw_buf_ptr = prev_raw_ptr; /* undo fetch */ \
+		need_data = true; \
+		continue; \
+	} \
+} else ((void) 0)
+
+/* This consumes the remainder of the buffer and breaks */
+#define IF_NEED_REFILL_AND_EOF_BREAK(extralen) \
+if (1) \
+{ \
+	if (raw_buf_ptr + (extralen) >= copy_buf_len && hit_eof) \
+	{ \
+		if (extralen) \
+			raw_buf_ptr = copy_buf_len; /* consume the partial character */ \
+		/* backslash just before EOF, treat as data char */ \
+		result = true; \
+		break; \
+	} \
+} else ((void) 0)
+
+/*
+ * Transfer any approved data to line_buf; must do this to be sure
+ * there is some room in raw_buf.
+ */
+#define REFILL_LINEBUF \
+if (1) \
+{ \
+	if (raw_buf_ptr > cstate->raw_buf_index) \
+	{ \
+		appendBinaryStringInfo(&cstate->line_buf, \
+							 cstate->raw_buf + cstate->raw_buf_index, \
+							   raw_buf_ptr - cstate->raw_buf_index); \
+		cstate->raw_buf_index = raw_buf_ptr; \
+	} \
+} else ((void) 0)
+
+/* Undo any read-ahead and jump out of the block. */
+#define NO_END_OF_COPY_GOTO \
+if (1) \
+{ \
+	raw_buf_ptr = prev_raw_ptr + 1; \
+	goto not_end_of_copy; \
+} else ((void) 0)
+
+/* NOTE: there's a copy of this in copyto.c */
+static const char BinarySignature[11] = "PGCOPY\n\377\r\n\0";
+
+
+/* non-export function prototypes */
+static bool CopyReadLine(CopyFromState cstate);
+static bool CopyReadLineText(CopyFromState cstate);
+static int	CopyReadAttributesText(CopyFromState cstate);
+static int	CopyReadAttributesCSV(CopyFromState cstate);
+static Datum CopyReadBinaryAttribute(CopyFromState cstate, FmgrInfo *flinfo,
+									 Oid typioparam, int32 typmod,
+									 bool *isnull);
+
+
+/* Low-level communications functions */
+static int	CopyGetData(CopyFromState cstate, void *databuf,
+						int minread, int maxread);
+static bool CopyGetInt32(CopyFromState cstate, int32 *val);
+static bool CopyGetInt16(CopyFromState cstate, int16 *val);
+static bool CopyLoadRawBuf(CopyFromState cstate);
+static int	CopyReadBinaryData(CopyFromState cstate, char *dest, int nbytes);
+
+void
+ReceiveCopyBegin(CopyFromState cstate)
+{
+	if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
+	{
+		/* new way */
+		StringInfoData buf;
+		int			natts = list_length(cstate->attnumlist);
+		int16		format = (cstate->opts.binary ? 1 : 0);
+		int			i;
+
+		pq_beginmessage(&buf, 'G');
+		pq_sendbyte(&buf, format);	/* overall format */
+		pq_sendint16(&buf, natts);
+		for (i = 0; i < natts; i++)
+			pq_sendint16(&buf, format); /* per-column formats */
+		pq_endmessage(&buf);
+		cstate->copy_src = COPY_NEW_FE;
+		cstate->fe_msgbuf = makeStringInfo();
+	}
+	else
+	{
+		/* old way */
+		if (cstate->opts.binary)
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("COPY BINARY is not supported to stdout or from stdin")));
+		pq_putemptymessage('G');
+		/* any error in old protocol will make us lose sync */
+		pq_startmsgread();
+		cstate->copy_src = COPY_OLD_FE;
+	}
+	/* We *must* flush here to ensure FE knows it can send. */
+	pq_flush();
+}
+
+void
+ReceiveCopyBinaryHeader(CopyFromState cstate)
+{
+	char		readSig[11];
+	int32		tmp;
+
+	/* Signature */
+	if (CopyReadBinaryData(cstate, readSig, 11) != 11 ||
+		memcmp(readSig, BinarySignature, 11) != 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("COPY file signature not recognized")));
+	/* Flags field */
+	if (!CopyGetInt32(cstate, &tmp))
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("invalid COPY file header (missing flags)")));
+	if ((tmp & (1 << 16)) != 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("invalid COPY file header (WITH OIDS)")));
+	tmp &= ~(1 << 16);
+	if ((tmp >> 16) != 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("unrecognized critical flags in COPY file header")));
+	/* Header extension length */
+	if (!CopyGetInt32(cstate, &tmp) ||
+		tmp < 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("invalid COPY file header (missing length)")));
+	/* Skip extension header, if present */
+	while (tmp-- > 0)
+	{
+		if (CopyReadBinaryData(cstate, readSig, 1) != 1)
+			ereport(ERROR,
+					(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+					 errmsg("invalid COPY file header (wrong length)")));
+	}
+}
+
+/*
+ * CopyGetData reads data from the source (file or frontend)
+ *
+ * We attempt to read at least minread, and at most maxread, bytes from
+ * the source.  The actual number of bytes read is returned; if this is
+ * less than minread, EOF was detected.
+ *
+ * Note: when copying from the frontend, we expect a proper EOF mark per
+ * protocol; if the frontend simply drops the connection, we raise error.
+ * It seems unwise to allow the COPY IN to complete normally in that case.
+ *
+ * NB: no data conversion is applied here.
+ */
+static int
+CopyGetData(CopyFromState cstate, void *databuf, int minread, int maxread)
+{
+	int			bytesread = 0;
+
+	switch (cstate->copy_src)
+	{
+		case COPY_FILE:
+			bytesread = fread(databuf, 1, maxread, cstate->copy_file);
+			if (ferror(cstate->copy_file))
+				ereport(ERROR,
+						(errcode_for_file_access(),
+						 errmsg("could not read from COPY file: %m")));
+			if (bytesread == 0)
+				cstate->reached_eof = true;
+			break;
+		case COPY_OLD_FE:
+
+			/*
+			 * We cannot read more than minread bytes (which in practice is 1)
+			 * because old protocol doesn't have any clear way of separating
+			 * the COPY stream from following data.  This is slow, but not any
+			 * slower than the code path was originally, and we don't care
+			 * much anymore about the performance of old protocol.
+			 */
+			if (pq_getbytes((char *) databuf, minread))
+			{
+				/* Only a \. terminator is legal EOF in old protocol */
+				ereport(ERROR,
+						(errcode(ERRCODE_CONNECTION_FAILURE),
+						 errmsg("unexpected EOF on client connection with an open transaction")));
+			}
+			bytesread = minread;
+			break;
+		case COPY_NEW_FE:
+			while (maxread > 0 && bytesread < minread && !cstate->reached_eof)
+			{
+				int			avail;
+
+				while (cstate->fe_msgbuf->cursor >= cstate->fe_msgbuf->len)
+				{
+					/* Try to receive another message */
+					int			mtype;
+
+			readmessage:
+					HOLD_CANCEL_INTERRUPTS();
+					pq_startmsgread();
+					mtype = pq_getbyte();
+					if (mtype == EOF)
+						ereport(ERROR,
+								(errcode(ERRCODE_CONNECTION_FAILURE),
+								 errmsg("unexpected EOF on client connection with an open transaction")));
+					if (pq_getmessage(cstate->fe_msgbuf, 0))
+						ereport(ERROR,
+								(errcode(ERRCODE_CONNECTION_FAILURE),
+								 errmsg("unexpected EOF on client connection with an open transaction")));
+					RESUME_CANCEL_INTERRUPTS();
+					switch (mtype)
+					{
+						case 'd':	/* CopyData */
+							break;
+						case 'c':	/* CopyDone */
+							/* COPY IN correctly terminated by frontend */
+							cstate->reached_eof = true;
+							return bytesread;
+						case 'f':	/* CopyFail */
+							ereport(ERROR,
+									(errcode(ERRCODE_QUERY_CANCELED),
+									 errmsg("COPY from stdin failed: %s",
+											pq_getmsgstring(cstate->fe_msgbuf))));
+							break;
+						case 'H':	/* Flush */
+						case 'S':	/* Sync */
+
+							/*
+							 * Ignore Flush/Sync for the convenience of client
+							 * libraries (such as libpq) that may send those
+							 * without noticing that the command they just
+							 * sent was COPY.
+							 */
+							goto readmessage;
+						default:
+							ereport(ERROR,
+									(errcode(ERRCODE_PROTOCOL_VIOLATION),
+									 errmsg("unexpected message type 0x%02X during COPY from stdin",
+											mtype)));
+							break;
+					}
+				}
+				avail = cstate->fe_msgbuf->len - cstate->fe_msgbuf->cursor;
+				if (avail > maxread)
+					avail = maxread;
+				pq_copymsgbytes(cstate->fe_msgbuf, databuf, avail);
+				databuf = (void *) ((char *) databuf + avail);
+				maxread -= avail;
+				bytesread += avail;
+			}
+			break;
+		case COPY_CALLBACK:
+			bytesread = cstate->data_source_cb(databuf, minread, maxread);
+			break;
+	}
+
+	return bytesread;
+}
+
+
+/*
+ * These functions do apply some data conversion
+ */
+
+/*
+ * CopyGetInt32 reads an int32 that appears in network byte order
+ *
+ * Returns true if OK, false if EOF
+ */
+static inline bool
+CopyGetInt32(CopyFromState cstate, int32 *val)
+{
+	uint32		buf;
+
+	if (CopyReadBinaryData(cstate, (char *) &buf, sizeof(buf)) != sizeof(buf))
+	{
+		*val = 0;				/* suppress compiler warning */
+		return false;
+	}
+	*val = (int32) pg_ntoh32(buf);
+	return true;
+}
+
+/*
+ * CopyGetInt16 reads an int16 that appears in network byte order
+ */
+static inline bool
+CopyGetInt16(CopyFromState cstate, int16 *val)
+{
+	uint16		buf;
+
+	if (CopyReadBinaryData(cstate, (char *) &buf, sizeof(buf)) != sizeof(buf))
+	{
+		*val = 0;				/* suppress compiler warning */
+		return false;
+	}
+	*val = (int16) pg_ntoh16(buf);
+	return true;
+}
+
+
+/*
+ * CopyLoadRawBuf loads some more data into raw_buf
+ *
+ * Returns true if able to obtain at least one more byte, else false.
+ *
+ * If RAW_BUF_BYTES(cstate) > 0, the unprocessed bytes are moved to the start
+ * of the buffer and then we load more data after that.  This case occurs only
+ * when a multibyte character crosses a bufferload boundary.
+ */
+static bool
+CopyLoadRawBuf(CopyFromState cstate)
+{
+	int			nbytes = RAW_BUF_BYTES(cstate);
+	int			inbytes;
+
+	/* Copy down the unprocessed data if any. */
+	if (nbytes > 0)
+		memmove(cstate->raw_buf, cstate->raw_buf + cstate->raw_buf_index,
+				nbytes);
+
+	inbytes = CopyGetData(cstate, cstate->raw_buf + nbytes,
+						  1, RAW_BUF_SIZE - nbytes);
+	nbytes += inbytes;
+	cstate->raw_buf[nbytes] = '\0';
+	cstate->raw_buf_index = 0;
+	cstate->raw_buf_len = nbytes;
+	return (inbytes > 0);
+}
+
+/*
+ * CopyReadBinaryData
+ *
+ * Reads up to 'nbytes' bytes from cstate->copy_file via cstate->raw_buf
+ * and writes them to 'dest'.  Returns the number of bytes read (which
+ * would be less than 'nbytes' only if we reach EOF).
+ */
+static int
+CopyReadBinaryData(CopyFromState cstate, char *dest, int nbytes)
+{
+	int			copied_bytes = 0;
+
+	if (RAW_BUF_BYTES(cstate) >= nbytes)
+	{
+		/* Enough bytes are present in the buffer. */
+		memcpy(dest, cstate->raw_buf + cstate->raw_buf_index, nbytes);
+		cstate->raw_buf_index += nbytes;
+		copied_bytes = nbytes;
+	}
+	else
+	{
+		/*
+		 * Not enough bytes in the buffer, so must read from the file.  Need
+		 * to loop since 'nbytes' could be larger than the buffer size.
+		 */
+		do
+		{
+			int			copy_bytes;
+
+			/* Load more data if buffer is empty. */
+			if (RAW_BUF_BYTES(cstate) == 0)
+			{
+				if (!CopyLoadRawBuf(cstate))
+					break;		/* EOF */
+			}
+
+			/* Transfer some bytes. */
+			copy_bytes = Min(nbytes - copied_bytes, RAW_BUF_BYTES(cstate));
+			memcpy(dest, cstate->raw_buf + cstate->raw_buf_index, copy_bytes);
+			cstate->raw_buf_index += copy_bytes;
+			dest += copy_bytes;
+			copied_bytes += copy_bytes;
+		} while (copied_bytes < nbytes);
+	}
+
+	return copied_bytes;
+}
+
+/*
+ * Read raw fields in the next line for COPY FROM in text or csv mode.
+ * Return false if no more lines.
+ *
+ * An internal temporary buffer is returned via 'fields'. It is valid until
+ * the next call of the function. Since the function returns all raw fields
+ * in the input file, 'nfields' could be different from the number of columns
+ * in the relation.
+ *
+ * NOTE: force_not_null option are not applied to the returned fields.
+ */
+bool
+NextCopyFromRawFields(CopyFromState cstate, char ***fields, int *nfields)
+{
+	int			fldct;
+	bool		done;
+
+	/* only available for text or csv input */
+	Assert(!cstate->opts.binary);
+
+	/* on input just throw the header line away */
+	if (cstate->cur_lineno == 0 && cstate->opts.header_line)
+	{
+		cstate->cur_lineno++;
+		if (CopyReadLine(cstate))
+			return false;		/* done */
+	}
+
+	cstate->cur_lineno++;
+
+	/* Actually read the line into memory here */
+	done = CopyReadLine(cstate);
+
+	/*
+	 * EOF at start of line means we're done.  If we see EOF after some
+	 * characters, we act as though it was newline followed by EOF, ie,
+	 * process the line and then exit loop on next iteration.
+	 */
+	if (done && cstate->line_buf.len == 0)
+		return false;
+
+	/* Parse the line into de-escaped field values */
+	if (cstate->opts.csv_mode)
+		fldct = CopyReadAttributesCSV(cstate);
+	else
+		fldct = CopyReadAttributesText(cstate);
+
+	*fields = cstate->raw_fields;
+	*nfields = fldct;
+	return true;
+}
+
+/*
+ * Read next tuple from file for COPY FROM. Return false if no more tuples.
+ *
+ * 'econtext' is used to evaluate default expression for each columns not
+ * read from the file. It can be NULL when no default values are used, i.e.
+ * when all columns are read from the file.
+ *
+ * 'values' and 'nulls' arrays must be the same length as columns of the
+ * relation passed to BeginCopyFrom. This function fills the arrays.
+ * Oid of the tuple is returned with 'tupleOid' separately.
+ */
+bool
+NextCopyFrom(CopyFromState cstate, ExprContext *econtext,
+			 Datum *values, bool *nulls)
+{
+	TupleDesc	tupDesc;
+	AttrNumber	num_phys_attrs,
+				attr_count,
+				num_defaults = cstate->num_defaults;
+	FmgrInfo   *in_functions = cstate->in_functions;
+	Oid		   *typioparams = cstate->typioparams;
+	int			i;
+	int		   *defmap = cstate->defmap;
+	ExprState **defexprs = cstate->defexprs;
+
+	tupDesc = RelationGetDescr(cstate->rel);
+	num_phys_attrs = tupDesc->natts;
+	attr_count = list_length(cstate->attnumlist);
+
+	/* Initialize all values for row to NULL */
+	MemSet(values, 0, num_phys_attrs * sizeof(Datum));
+	MemSet(nulls, true, num_phys_attrs * sizeof(bool));
+
+	if (!cstate->opts.binary)
+	{
+		char	  **field_strings;
+		ListCell   *cur;
+		int			fldct;
+		int			fieldno;
+		char	   *string;
+
+		/* read raw fields in the next line */
+		if (!NextCopyFromRawFields(cstate, &field_strings, &fldct))
+			return false;
+
+		/* check for overflowing fields */
+		if (attr_count > 0 && fldct > attr_count)
+			ereport(ERROR,
+					(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+					 errmsg("extra data after last expected column")));
+
+		fieldno = 0;
+
+		/* Loop to read the user attributes on the line. */
+		foreach(cur, cstate->attnumlist)
+		{
+			int			attnum = lfirst_int(cur);
+			int			m = attnum - 1;
+			Form_pg_attribute att = TupleDescAttr(tupDesc, m);
+
+			if (fieldno >= fldct)
+				ereport(ERROR,
+						(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+						 errmsg("missing data for column \"%s\"",
+								NameStr(att->attname))));
+			string = field_strings[fieldno++];
+
+			if (cstate->convert_select_flags &&
+				!cstate->convert_select_flags[m])
+			{
+				/* ignore input field, leaving column as NULL */
+				continue;
+			}
+
+			if (cstate->opts.csv_mode)
+			{
+				if (string == NULL &&
+					cstate->opts.force_notnull_flags[m])
+				{
+					/*
+					 * FORCE_NOT_NULL option is set and column is NULL -
+					 * convert it to the NULL string.
+					 */
+					string = cstate->opts.null_print;
+				}
+				else if (string != NULL && cstate->opts.force_null_flags[m]
+						 && strcmp(string, cstate->opts.null_print) == 0)
+				{
+					/*
+					 * FORCE_NULL option is set and column matches the NULL
+					 * string. It must have been quoted, or otherwise the
+					 * string would already have been set to NULL. Convert it
+					 * to NULL as specified.
+					 */
+					string = NULL;
+				}
+			}
+
+			cstate->cur_attname = NameStr(att->attname);
+			cstate->cur_attval = string;
+			values[m] = InputFunctionCall(&in_functions[m],
+										  string,
+										  typioparams[m],
+										  att->atttypmod);
+			if (string != NULL)
+				nulls[m] = false;
+			cstate->cur_attname = NULL;
+			cstate->cur_attval = NULL;
+		}
+
+		Assert(fieldno == attr_count);
+	}
+	else
+	{
+		/* binary */
+		int16		fld_count;
+		ListCell   *cur;
+
+		cstate->cur_lineno++;
+
+		if (!CopyGetInt16(cstate, &fld_count))
+		{
+			/* EOF detected (end of file, or protocol-level EOF) */
+			return false;
+		}
+
+		if (fld_count == -1)
+		{
+			/*
+			 * Received EOF marker.  In a V3-protocol copy, wait for the
+			 * protocol-level EOF, and complain if it doesn't come
+			 * immediately.  This ensures that we correctly handle CopyFail,
+			 * if client chooses to send that now.
+			 *
+			 * Note that we MUST NOT try to read more data in an old-protocol
+			 * copy, since there is no protocol-level EOF marker then.  We
+			 * could go either way for copy from file, but choose to throw
+			 * error if there's data after the EOF marker, for consistency
+			 * with the new-protocol case.
+			 */
+			char		dummy;
+
+			if (cstate->copy_src != COPY_OLD_FE &&
+				CopyReadBinaryData(cstate, &dummy, 1) > 0)
+				ereport(ERROR,
+						(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+						 errmsg("received copy data after EOF marker")));
+			return false;
+		}
+
+		if (fld_count != attr_count)
+			ereport(ERROR,
+					(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+					 errmsg("row field count is %d, expected %d",
+							(int) fld_count, attr_count)));
+
+		foreach(cur, cstate->attnumlist)
+		{
+			int			attnum = lfirst_int(cur);
+			int			m = attnum - 1;
+			Form_pg_attribute att = TupleDescAttr(tupDesc, m);
+
+			cstate->cur_attname = NameStr(att->attname);
+			values[m] = CopyReadBinaryAttribute(cstate,
+												&in_functions[m],
+												typioparams[m],
+												att->atttypmod,
+												&nulls[m]);
+			cstate->cur_attname = NULL;
+		}
+	}
+
+	/*
+	 * Now compute and insert any defaults available for the columns not
+	 * provided by the input data.  Anything not processed here or above will
+	 * remain NULL.
+	 */
+	for (i = 0; i < num_defaults; i++)
+	{
+		/*
+		 * The caller must supply econtext and have switched into the
+		 * per-tuple memory context in it.
+		 */
+		Assert(econtext != NULL);
+		Assert(CurrentMemoryContext == econtext->ecxt_per_tuple_memory);
+
+		values[defmap[i]] = ExecEvalExpr(defexprs[i], econtext,
+										 &nulls[defmap[i]]);
+	}
+
+	return true;
+}
+
+/*
+ * Read the next input line and stash it in line_buf, with conversion to
+ * server encoding.
+ *
+ * Result is true if read was terminated by EOF, false if terminated
+ * by newline.  The terminating newline or EOF marker is not included
+ * in the final value of line_buf.
+ */
+static bool
+CopyReadLine(CopyFromState cstate)
+{
+	bool		result;
+
+	resetStringInfo(&cstate->line_buf);
+	cstate->line_buf_valid = true;
+
+	/* Mark that encoding conversion hasn't occurred yet */
+	cstate->line_buf_converted = false;
+
+	/* Parse data and transfer into line_buf */
+	result = CopyReadLineText(cstate);
+
+	if (result)
+	{
+		/*
+		 * Reached EOF.  In protocol version 3, we should ignore anything
+		 * after \. up to the protocol end of copy data.  (XXX maybe better
+		 * not to treat \. as special?)
+		 */
+		if (cstate->copy_src == COPY_NEW_FE)
+		{
+			do
+			{
+				cstate->raw_buf_index = cstate->raw_buf_len;
+			} while (CopyLoadRawBuf(cstate));
+		}
+	}
+	else
+	{
+		/*
+		 * If we didn't hit EOF, then we must have transferred the EOL marker
+		 * to line_buf along with the data.  Get rid of it.
+		 */
+		switch (cstate->eol_type)
+		{
+			case EOL_NL:
+				Assert(cstate->line_buf.len >= 1);
+				Assert(cstate->line_buf.data[cstate->line_buf.len - 1] == '\n');
+				cstate->line_buf.len--;
+				cstate->line_buf.data[cstate->line_buf.len] = '\0';
+				break;
+			case EOL_CR:
+				Assert(cstate->line_buf.len >= 1);
+				Assert(cstate->line_buf.data[cstate->line_buf.len - 1] == '\r');
+				cstate->line_buf.len--;
+				cstate->line_buf.data[cstate->line_buf.len] = '\0';
+				break;
+			case EOL_CRNL:
+				Assert(cstate->line_buf.len >= 2);
+				Assert(cstate->line_buf.data[cstate->line_buf.len - 2] == '\r');
+				Assert(cstate->line_buf.data[cstate->line_buf.len - 1] == '\n');
+				cstate->line_buf.len -= 2;
+				cstate->line_buf.data[cstate->line_buf.len] = '\0';
+				break;
+			case EOL_UNKNOWN:
+				/* shouldn't get here */
+				Assert(false);
+				break;
+		}
+	}
+
+	/* Done reading the line.  Convert it to server encoding. */
+	if (cstate->need_transcoding)
+	{
+		char	   *cvt;
+
+		cvt = pg_any_to_server(cstate->line_buf.data,
+							   cstate->line_buf.len,
+							   cstate->file_encoding);
+		if (cvt != cstate->line_buf.data)
+		{
+			/* transfer converted data back to line_buf */
+			resetStringInfo(&cstate->line_buf);
+			appendBinaryStringInfo(&cstate->line_buf, cvt, strlen(cvt));
+			pfree(cvt);
+		}
+	}
+
+	/* Now it's safe to use the buffer in error messages */
+	cstate->line_buf_converted = true;
+
+	return result;
+}
+
+/*
+ * CopyReadLineText - inner loop of CopyReadLine for text mode
+ */
+static bool
+CopyReadLineText(CopyFromState cstate)
+{
+	char	   *copy_raw_buf;
+	int			raw_buf_ptr;
+	int			copy_buf_len;
+	bool		need_data = false;
+	bool		hit_eof = false;
+	bool		result = false;
+	char		mblen_str[2];
+
+	/* CSV variables */
+	bool		first_char_in_line = true;
+	bool		in_quote = false,
+				last_was_esc = false;
+	char		quotec = '\0';
+	char		escapec = '\0';
+
+	if (cstate->opts.csv_mode)
+	{
+		quotec = cstate->opts.quote[0];
+		escapec = cstate->opts.escape[0];
+		/* ignore special escape processing if it's the same as quotec */
+		if (quotec == escapec)
+			escapec = '\0';
+	}
+
+	mblen_str[1] = '\0';
+
+	/*
+	 * The objective of this loop is to transfer the entire next input line
+	 * into line_buf.  Hence, we only care for detecting newlines (\r and/or
+	 * \n) and the end-of-copy marker (\.).
+	 *
+	 * In CSV mode, \r and \n inside a quoted field are just part of the data
+	 * value and are put in line_buf.  We keep just enough state to know if we
+	 * are currently in a quoted field or not.
+	 *
+	 * These four characters, and the CSV escape and quote characters, are
+	 * assumed the same in frontend and backend encodings.
+	 *
+	 * For speed, we try to move data from raw_buf to line_buf in chunks
+	 * rather than one character at a time.  raw_buf_ptr points to the next
+	 * character to examine; any characters from raw_buf_index to raw_buf_ptr
+	 * have been determined to be part of the line, but not yet transferred to
+	 * line_buf.
+	 *
+	 * For a little extra speed within the loop, we copy raw_buf and
+	 * raw_buf_len into local variables.
+	 */
+	copy_raw_buf = cstate->raw_buf;
+	raw_buf_ptr = cstate->raw_buf_index;
+	copy_buf_len = cstate->raw_buf_len;
+
+	for (;;)
+	{
+		int			prev_raw_ptr;
+		char		c;
+
+		/*
+		 * Load more data if needed.  Ideally we would just force four bytes
+		 * of read-ahead and avoid the many calls to
+		 * IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(), but the COPY_OLD_FE protocol
+		 * does not allow us to read too far ahead or we might read into the
+		 * next data, so we read-ahead only as far we know we can.  One
+		 * optimization would be to read-ahead four byte here if
+		 * cstate->copy_src != COPY_OLD_FE, but it hardly seems worth it,
+		 * considering the size of the buffer.
+		 */
+		if (raw_buf_ptr >= copy_buf_len || need_data)
+		{
+			REFILL_LINEBUF;
+
+			/*
+			 * Try to read some more data.  This will certainly reset
+			 * raw_buf_index to zero, and raw_buf_ptr must go with it.
+			 */
+			if (!CopyLoadRawBuf(cstate))
+				hit_eof = true;
+			raw_buf_ptr = 0;
+			copy_buf_len = cstate->raw_buf_len;
+
+			/*
+			 * If we are completely out of data, break out of the loop,
+			 * reporting EOF.
+			 */
+			if (copy_buf_len <= 0)
+			{
+				result = true;
+				break;
+			}
+			need_data = false;
+		}
+
+		/* OK to fetch a character */
+		prev_raw_ptr = raw_buf_ptr;
+		c = copy_raw_buf[raw_buf_ptr++];
+
+		if (cstate->opts.csv_mode)
+		{
+			/*
+			 * If character is '\\' or '\r', we may need to look ahead below.
+			 * Force fetch of the next character if we don't already have it.
+			 * We need to do this before changing CSV state, in case one of
+			 * these characters is also the quote or escape character.
+			 *
+			 * Note: old-protocol does not like forced prefetch, but it's OK
+			 * here since we cannot validly be at EOF.
+			 */
+			if (c == '\\' || c == '\r')
+			{
+				IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(0);
+			}
+
+			/*
+			 * Dealing with quotes and escapes here is mildly tricky. If the
+			 * quote char is also the escape char, there's no problem - we
+			 * just use the char as a toggle. If they are different, we need
+			 * to ensure that we only take account of an escape inside a
+			 * quoted field and immediately preceding a quote char, and not
+			 * the second in an escape-escape sequence.
+			 */
+			if (in_quote && c == escapec)
+				last_was_esc = !last_was_esc;
+			if (c == quotec && !last_was_esc)
+				in_quote = !in_quote;
+			if (c != escapec)
+				last_was_esc = false;
+
+			/*
+			 * Updating the line count for embedded CR and/or LF chars is
+			 * necessarily a little fragile - this test is probably about the
+			 * best we can do.  (XXX it's arguable whether we should do this
+			 * at all --- is cur_lineno a physical or logical count?)
+			 */
+			if (in_quote && c == (cstate->eol_type == EOL_NL ? '\n' : '\r'))
+				cstate->cur_lineno++;
+		}
+
+		/* Process \r */
+		if (c == '\r' && (!cstate->opts.csv_mode || !in_quote))
+		{
+			/* Check for \r\n on first line, _and_ handle \r\n. */
+			if (cstate->eol_type == EOL_UNKNOWN ||
+				cstate->eol_type == EOL_CRNL)
+			{
+				/*
+				 * If need more data, go back to loop top to load it.
+				 *
+				 * Note that if we are at EOF, c will wind up as '\0' because
+				 * of the guaranteed pad of raw_buf.
+				 */
+				IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(0);
+
+				/* get next char */
+				c = copy_raw_buf[raw_buf_ptr];
+
+				if (c == '\n')
+				{
+					raw_buf_ptr++;	/* eat newline */
+					cstate->eol_type = EOL_CRNL;	/* in case not set yet */
+				}
+				else
+				{
+					/* found \r, but no \n */
+					if (cstate->eol_type == EOL_CRNL)
+						ereport(ERROR,
+								(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+								 !cstate->opts.csv_mode ?
+								 errmsg("literal carriage return found in data") :
+								 errmsg("unquoted carriage return found in data"),
+								 !cstate->opts.csv_mode ?
+								 errhint("Use \"\\r\" to represent carriage return.") :
+								 errhint("Use quoted CSV field to represent carriage return.")));
+
+					/*
+					 * if we got here, it is the first line and we didn't find
+					 * \n, so don't consume the peeked character
+					 */
+					cstate->eol_type = EOL_CR;
+				}
+			}
+			else if (cstate->eol_type == EOL_NL)
+				ereport(ERROR,
+						(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+						 !cstate->opts.csv_mode ?
+						 errmsg("literal carriage return found in data") :
+						 errmsg("unquoted carriage return found in data"),
+						 !cstate->opts.csv_mode ?
+						 errhint("Use \"\\r\" to represent carriage return.") :
+						 errhint("Use quoted CSV field to represent carriage return.")));
+			/* If reach here, we have found the line terminator */
+			break;
+		}
+
+		/* Process \n */
+		if (c == '\n' && (!cstate->opts.csv_mode || !in_quote))
+		{
+			if (cstate->eol_type == EOL_CR || cstate->eol_type == EOL_CRNL)
+				ereport(ERROR,
+						(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+						 !cstate->opts.csv_mode ?
+						 errmsg("literal newline found in data") :
+						 errmsg("unquoted newline found in data"),
+						 !cstate->opts.csv_mode ?
+						 errhint("Use \"\\n\" to represent newline.") :
+						 errhint("Use quoted CSV field to represent newline.")));
+			cstate->eol_type = EOL_NL;	/* in case not set yet */
+			/* If reach here, we have found the line terminator */
+			break;
+		}
+
+		/*
+		 * In CSV mode, we only recognize \. alone on a line.  This is because
+		 * \. is a valid CSV data value.
+		 */
+		if (c == '\\' && (!cstate->opts.csv_mode || first_char_in_line))
+		{
+			char		c2;
+
+			IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(0);
+			IF_NEED_REFILL_AND_EOF_BREAK(0);
+
+			/* -----
+			 * get next character
+			 * Note: we do not change c so if it isn't \., we can fall
+			 * through and continue processing for file encoding.
+			 * -----
+			 */
+			c2 = copy_raw_buf[raw_buf_ptr];
+
+			if (c2 == '.')
+			{
+				raw_buf_ptr++;	/* consume the '.' */
+
+				/*
+				 * Note: if we loop back for more data here, it does not
+				 * matter that the CSV state change checks are re-executed; we
+				 * will come back here with no important state changed.
+				 */
+				if (cstate->eol_type == EOL_CRNL)
+				{
+					/* Get the next character */
+					IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(0);
+					/* if hit_eof, c2 will become '\0' */
+					c2 = copy_raw_buf[raw_buf_ptr++];
+
+					if (c2 == '\n')
+					{
+						if (!cstate->opts.csv_mode)
+							ereport(ERROR,
+									(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+									 errmsg("end-of-copy marker does not match previous newline style")));
+						else
+							NO_END_OF_COPY_GOTO;
+					}
+					else if (c2 != '\r')
+					{
+						if (!cstate->opts.csv_mode)
+							ereport(ERROR,
+									(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+									 errmsg("end-of-copy marker corrupt")));
+						else
+							NO_END_OF_COPY_GOTO;
+					}
+				}
+
+				/* Get the next character */
+				IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(0);
+				/* if hit_eof, c2 will become '\0' */
+				c2 = copy_raw_buf[raw_buf_ptr++];
+
+				if (c2 != '\r' && c2 != '\n')
+				{
+					if (!cstate->opts.csv_mode)
+						ereport(ERROR,
+								(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+								 errmsg("end-of-copy marker corrupt")));
+					else
+						NO_END_OF_COPY_GOTO;
+				}
+
+				if ((cstate->eol_type == EOL_NL && c2 != '\n') ||
+					(cstate->eol_type == EOL_CRNL && c2 != '\n') ||
+					(cstate->eol_type == EOL_CR && c2 != '\r'))
+				{
+					ereport(ERROR,
+							(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+							 errmsg("end-of-copy marker does not match previous newline style")));
+				}
+
+				/*
+				 * Transfer only the data before the \. into line_buf, then
+				 * discard the data and the \. sequence.
+				 */
+				if (prev_raw_ptr > cstate->raw_buf_index)
+					appendBinaryStringInfo(&cstate->line_buf,
+										   cstate->raw_buf + cstate->raw_buf_index,
+										   prev_raw_ptr - cstate->raw_buf_index);
+				cstate->raw_buf_index = raw_buf_ptr;
+				result = true;	/* report EOF */
+				break;
+			}
+			else if (!cstate->opts.csv_mode)
+
+				/*
+				 * If we are here, it means we found a backslash followed by
+				 * something other than a period.  In non-CSV mode, anything
+				 * after a backslash is special, so we skip over that second
+				 * character too.  If we didn't do that \\. would be
+				 * considered an eof-of copy, while in non-CSV mode it is a
+				 * literal backslash followed by a period.  In CSV mode,
+				 * backslashes are not special, so we want to process the
+				 * character after the backslash just like a normal character,
+				 * so we don't increment in those cases.
+				 */
+				raw_buf_ptr++;
+		}
+
+		/*
+		 * This label is for CSV cases where \. appears at the start of a
+		 * line, but there is more text after it, meaning it was a data value.
+		 * We are more strict for \. in CSV mode because \. could be a data
+		 * value, while in non-CSV mode, \. cannot be a data value.
+		 */
+not_end_of_copy:
+
+		/*
+		 * Process all bytes of a multi-byte character as a group.
+		 *
+		 * We only support multi-byte sequences where the first byte has the
+		 * high-bit set, so as an optimization we can avoid this block
+		 * entirely if it is not set.
+		 */
+		if (cstate->encoding_embeds_ascii && IS_HIGHBIT_SET(c))
+		{
+			int			mblen;
+
+			/*
+			 * It is enough to look at the first byte in all our encodings, to
+			 * get the length.  (GB18030 is a bit special, but still works for
+			 * our purposes; see comment in pg_gb18030_mblen())
+			 */
+			mblen_str[0] = c;
+			mblen = pg_encoding_mblen(cstate->file_encoding, mblen_str);
+
+			IF_NEED_REFILL_AND_NOT_EOF_CONTINUE(mblen - 1);
+			IF_NEED_REFILL_AND_EOF_BREAK(mblen - 1);
+			raw_buf_ptr += mblen - 1;
+		}
+		first_char_in_line = false;
+	}							/* end of outer loop */
+
+	/*
+	 * Transfer any still-uncopied data to line_buf.
+	 */
+	REFILL_LINEBUF;
+
+	return result;
+}
+
+/*
+ *	Return decimal value for a hexadecimal digit
+ */
+static int
+GetDecimalFromHex(char hex)
+{
+	if (isdigit((unsigned char) hex))
+		return hex - '0';
+	else
+		return tolower((unsigned char) hex) - 'a' + 10;
+}
+
+/*
+ * Parse the current line into separate attributes (fields),
+ * performing de-escaping as needed.
+ *
+ * The input is in line_buf.  We use attribute_buf to hold the result
+ * strings.  cstate->raw_fields[k] is set to point to the k'th attribute
+ * string, or NULL when the input matches the null marker string.
+ * This array is expanded as necessary.
+ *
+ * (Note that the caller cannot check for nulls since the returned
+ * string would be the post-de-escaping equivalent, which may look
+ * the same as some valid data string.)
+ *
+ * delim is the column delimiter string (must be just one byte for now).
+ * null_print is the null marker string.  Note that this is compared to
+ * the pre-de-escaped input string.
+ *
+ * The return value is the number of fields actually read.
+ */
+static int
+CopyReadAttributesText(CopyFromState cstate)
+{
+	char		delimc = cstate->opts.delim[0];
+	int			fieldno;
+	char	   *output_ptr;
+	char	   *cur_ptr;
+	char	   *line_end_ptr;
+
+	/*
+	 * We need a special case for zero-column tables: check that the input
+	 * line is empty, and return.
+	 */
+	if (cstate->max_fields <= 0)
+	{
+		if (cstate->line_buf.len != 0)
+			ereport(ERROR,
+					(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+					 errmsg("extra data after last expected column")));
+		return 0;
+	}
+
+	resetStringInfo(&cstate->attribute_buf);
+
+	/*
+	 * The de-escaped attributes will certainly not be longer than the input
+	 * data line, so we can just force attribute_buf to be large enough and
+	 * then transfer data without any checks for enough space.  We need to do
+	 * it this way because enlarging attribute_buf mid-stream would invalidate
+	 * pointers already stored into cstate->raw_fields[].
+	 */
+	if (cstate->attribute_buf.maxlen <= cstate->line_buf.len)
+		enlargeStringInfo(&cstate->attribute_buf, cstate->line_buf.len);
+	output_ptr = cstate->attribute_buf.data;
+
+	/* set pointer variables for loop */
+	cur_ptr = cstate->line_buf.data;
+	line_end_ptr = cstate->line_buf.data + cstate->line_buf.len;
+
+	/* Outer loop iterates over fields */
+	fieldno = 0;
+	for (;;)
+	{
+		bool		found_delim = false;
+		char	   *start_ptr;
+		char	   *end_ptr;
+		int			input_len;
+		bool		saw_non_ascii = false;
+
+		/* Make sure there is enough space for the next value */
+		if (fieldno >= cstate->max_fields)
+		{
+			cstate->max_fields *= 2;
+			cstate->raw_fields =
+				repalloc(cstate->raw_fields, cstate->max_fields * sizeof(char *));
+		}
+
+		/* Remember start of field on both input and output sides */
+		start_ptr = cur_ptr;
+		cstate->raw_fields[fieldno] = output_ptr;
+
+		/*
+		 * Scan data for field.
+		 *
+		 * Note that in this loop, we are scanning to locate the end of field
+		 * and also speculatively performing de-escaping.  Once we find the
+		 * end-of-field, we can match the raw field contents against the null
+		 * marker string.  Only after that comparison fails do we know that
+		 * de-escaping is actually the right thing to do; therefore we *must
+		 * not* throw any syntax errors before we've done the null-marker
+		 * check.
+		 */
+		for (;;)
+		{
+			char		c;
+
+			end_ptr = cur_ptr;
+			if (cur_ptr >= line_end_ptr)
+				break;
+			c = *cur_ptr++;
+			if (c == delimc)
+			{
+				found_delim = true;
+				break;
+			}
+			if (c == '\\')
+			{
+				if (cur_ptr >= line_end_ptr)
+					break;
+				c = *cur_ptr++;
+				switch (c)
+				{
+					case '0':
+					case '1':
+					case '2':
+					case '3':
+					case '4':
+					case '5':
+					case '6':
+					case '7':
+						{
+							/* handle \013 */
+							int			val;
+
+							val = OCTVALUE(c);
+							if (cur_ptr < line_end_ptr)
+							{
+								c = *cur_ptr;
+								if (ISOCTAL(c))
+								{
+									cur_ptr++;
+									val = (val << 3) + OCTVALUE(c);
+									if (cur_ptr < line_end_ptr)
+									{
+										c = *cur_ptr;
+										if (ISOCTAL(c))
+										{
+											cur_ptr++;
+											val = (val << 3) + OCTVALUE(c);
+										}
+									}
+								}
+							}
+							c = val & 0377;
+							if (c == '\0' || IS_HIGHBIT_SET(c))
+								saw_non_ascii = true;
+						}
+						break;
+					case 'x':
+						/* Handle \x3F */
+						if (cur_ptr < line_end_ptr)
+						{
+							char		hexchar = *cur_ptr;
+
+							if (isxdigit((unsigned char) hexchar))
+							{
+								int			val = GetDecimalFromHex(hexchar);
+
+								cur_ptr++;
+								if (cur_ptr < line_end_ptr)
+								{
+									hexchar = *cur_ptr;
+									if (isxdigit((unsigned char) hexchar))
+									{
+										cur_ptr++;
+										val = (val << 4) + GetDecimalFromHex(hexchar);
+									}
+								}
+								c = val & 0xff;
+								if (c == '\0' || IS_HIGHBIT_SET(c))
+									saw_non_ascii = true;
+							}
+						}
+						break;
+					case 'b':
+						c = '\b';
+						break;
+					case 'f':
+						c = '\f';
+						break;
+					case 'n':
+						c = '\n';
+						break;
+					case 'r':
+						c = '\r';
+						break;
+					case 't':
+						c = '\t';
+						break;
+					case 'v':
+						c = '\v';
+						break;
+
+						/*
+						 * in all other cases, take the char after '\'
+						 * literally
+						 */
+				}
+			}
+
+			/* Add c to output string */
+			*output_ptr++ = c;
+		}
+
+		/* Check whether raw input matched null marker */
+		input_len = end_ptr - start_ptr;
+		if (input_len == cstate->opts.null_print_len &&
+			strncmp(start_ptr, cstate->opts.null_print, input_len) == 0)
+			cstate->raw_fields[fieldno] = NULL;
+		else
+		{
+			/*
+			 * At this point we know the field is supposed to contain data.
+			 *
+			 * If we de-escaped any non-7-bit-ASCII chars, make sure the
+			 * resulting string is valid data for the db encoding.
+			 */
+			if (saw_non_ascii)
+			{
+				char	   *fld = cstate->raw_fields[fieldno];
+
+				pg_verifymbstr(fld, output_ptr - fld, false);
+			}
+		}
+
+		/* Terminate attribute value in output area */
+		*output_ptr++ = '\0';
+
+		fieldno++;
+		/* Done if we hit EOL instead of a delim */
+		if (!found_delim)
+			break;
+	}
+
+	/* Clean up state of attribute_buf */
+	output_ptr--;
+	Assert(*output_ptr == '\0');
+	cstate->attribute_buf.len = (output_ptr - cstate->attribute_buf.data);
+
+	return fieldno;
+}
+
+/*
+ * Parse the current line into separate attributes (fields),
+ * performing de-escaping as needed.  This has exactly the same API as
+ * CopyReadAttributesText, except we parse the fields according to
+ * "standard" (i.e. common) CSV usage.
+ */
+static int
+CopyReadAttributesCSV(CopyFromState cstate)
+{
+	char		delimc = cstate->opts.delim[0];
+	char		quotec = cstate->opts.quote[0];
+	char		escapec = cstate->opts.escape[0];
+	int			fieldno;
+	char	   *output_ptr;
+	char	   *cur_ptr;
+	char	   *line_end_ptr;
+
+	/*
+	 * We need a special case for zero-column tables: check that the input
+	 * line is empty, and return.
+	 */
+	if (cstate->max_fields <= 0)
+	{
+		if (cstate->line_buf.len != 0)
+			ereport(ERROR,
+					(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+					 errmsg("extra data after last expected column")));
+		return 0;
+	}
+
+	resetStringInfo(&cstate->attribute_buf);
+
+	/*
+	 * The de-escaped attributes will certainly not be longer than the input
+	 * data line, so we can just force attribute_buf to be large enough and
+	 * then transfer data without any checks for enough space.  We need to do
+	 * it this way because enlarging attribute_buf mid-stream would invalidate
+	 * pointers already stored into cstate->raw_fields[].
+	 */
+	if (cstate->attribute_buf.maxlen <= cstate->line_buf.len)
+		enlargeStringInfo(&cstate->attribute_buf, cstate->line_buf.len);
+	output_ptr = cstate->attribute_buf.data;
+
+	/* set pointer variables for loop */
+	cur_ptr = cstate->line_buf.data;
+	line_end_ptr = cstate->line_buf.data + cstate->line_buf.len;
+
+	/* Outer loop iterates over fields */
+	fieldno = 0;
+	for (;;)
+	{
+		bool		found_delim = false;
+		bool		saw_quote = false;
+		char	   *start_ptr;
+		char	   *end_ptr;
+		int			input_len;
+
+		/* Make sure there is enough space for the next value */
+		if (fieldno >= cstate->max_fields)
+		{
+			cstate->max_fields *= 2;
+			cstate->raw_fields =
+				repalloc(cstate->raw_fields, cstate->max_fields * sizeof(char *));
+		}
+
+		/* Remember start of field on both input and output sides */
+		start_ptr = cur_ptr;
+		cstate->raw_fields[fieldno] = output_ptr;
+
+		/*
+		 * Scan data for field,
+		 *
+		 * The loop starts in "not quote" mode and then toggles between that
+		 * and "in quote" mode. The loop exits normally if it is in "not
+		 * quote" mode and a delimiter or line end is seen.
+		 */
+		for (;;)
+		{
+			char		c;
+
+			/* Not in quote */
+			for (;;)
+			{
+				end_ptr = cur_ptr;
+				if (cur_ptr >= line_end_ptr)
+					goto endfield;
+				c = *cur_ptr++;
+				/* unquoted field delimiter */
+				if (c == delimc)
+				{
+					found_delim = true;
+					goto endfield;
+				}
+				/* start of quoted field (or part of field) */
+				if (c == quotec)
+				{
+					saw_quote = true;
+					break;
+				}
+				/* Add c to output string */
+				*output_ptr++ = c;
+			}
+
+			/* In quote */
+			for (;;)
+			{
+				end_ptr = cur_ptr;
+				if (cur_ptr >= line_end_ptr)
+					ereport(ERROR,
+							(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+							 errmsg("unterminated CSV quoted field")));
+
+				c = *cur_ptr++;
+
+				/* escape within a quoted field */
+				if (c == escapec)
+				{
+					/*
+					 * peek at the next char if available, and escape it if it
+					 * is an escape char or a quote char
+					 */
+					if (cur_ptr < line_end_ptr)
+					{
+						char		nextc = *cur_ptr;
+
+						if (nextc == escapec || nextc == quotec)
+						{
+							*output_ptr++ = nextc;
+							cur_ptr++;
+							continue;
+						}
+					}
+				}
+
+				/*
+				 * end of quoted field. Must do this test after testing for
+				 * escape in case quote char and escape char are the same
+				 * (which is the common case).
+				 */
+				if (c == quotec)
+					break;
+
+				/* Add c to output string */
+				*output_ptr++ = c;
+			}
+		}
+endfield:
+
+		/* Terminate attribute value in output area */
+		*output_ptr++ = '\0';
+
+		/* Check whether raw input matched null marker */
+		input_len = end_ptr - start_ptr;
+		if (!saw_quote && input_len == cstate->opts.null_print_len &&
+			strncmp(start_ptr, cstate->opts.null_print, input_len) == 0)
+			cstate->raw_fields[fieldno] = NULL;
+
+		fieldno++;
+		/* Done if we hit EOL instead of a delim */
+		if (!found_delim)
+			break;
+	}
+
+	/* Clean up state of attribute_buf */
+	output_ptr--;
+	Assert(*output_ptr == '\0');
+	cstate->attribute_buf.len = (output_ptr - cstate->attribute_buf.data);
+
+	return fieldno;
+}
+
+
+/*
+ * Read a binary attribute
+ */
+static Datum
+CopyReadBinaryAttribute(CopyFromState cstate, FmgrInfo *flinfo,
+						Oid typioparam, int32 typmod,
+						bool *isnull)
+{
+	int32		fld_size;
+	Datum		result;
+
+	if (!CopyGetInt32(cstate, &fld_size))
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("unexpected EOF in COPY data")));
+	if (fld_size == -1)
+	{
+		*isnull = true;
+		return ReceiveFunctionCall(flinfo, NULL, typioparam, typmod);
+	}
+	if (fld_size < 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("invalid field size")));
+
+	/* reset attribute_buf to empty, and load raw data in it */
+	resetStringInfo(&cstate->attribute_buf);
+
+	enlargeStringInfo(&cstate->attribute_buf, fld_size);
+	if (CopyReadBinaryData(cstate, cstate->attribute_buf.data,
+						   fld_size) != fld_size)
+		ereport(ERROR,
+				(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
+				 errmsg("unexpected EOF in COPY data")));
+
+	cstate->attribute_buf.len = fld_size;
+	cstate->attribute_buf.data[fld_size] = '\0';
+
+	/* Call the column type's binary input converter */
+	result = ReceiveFunctionCall(flinfo, &cstate->attribute_buf,
+								 typioparam, typmod);
+
+	/* Trouble if it didn't eat the whole buffer */
+	if (cstate->attribute_buf.cursor != cstate->attribute_buf.len)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
+				 errmsg("incorrect binary data format")));
+
+	*isnull = false;
+	return result;
+}