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postgres/src/backend/commands/copy.c
Bruce Momjian 202e6e73e6 Add support for \x hex escapes in COPY. 
Sergey Ten
2005-06-02 01:21:22 +00:00

2800 lines
71 KiB
C
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/*-------------------------------------------------------------------------
*
* copy.c
* Implements the COPY utility command.
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.245 2005/06/02 01:21:22 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "access/genam.h"
#include "access/heapam.h"
#include "access/printtup.h"
#include "catalog/index.h"
#include "catalog/namespace.h"
#include "catalog/pg_index.h"
#include "catalog/pg_shadow.h"
#include "catalog/pg_type.h"
#include "commands/copy.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "parser/parse_coerce.h"
#include "parser/parse_relation.h"
#include "rewrite/rewriteHandler.h"
#include "storage/fd.h"
#include "tcop/pquery.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
#include "utils/syscache.h"
#define ISOCTAL(c) (((c) >= '0') && ((c) <= '7'))
#define OCTVALUE(c) ((c) - '0')
/*
* Represents the different source/dest cases we need to worry about at
* the bottom level
*/
typedef enum CopyDest
{
COPY_FILE, /* to/from file */
COPY_OLD_FE, /* to/from frontend (2.0 protocol) */
COPY_NEW_FE /* to/from frontend (3.0 protocol) */
} CopyDest;
/*
* State indicator showing what stopped CopyReadAttribute()
*/
typedef enum CopyReadResult
{
NORMAL_ATTR,
END_OF_LINE,
UNTERMINATED_FIELD
} CopyReadResult;
/*
* Represents the end-of-line terminator type of the input
*/
typedef enum EolType
{
EOL_UNKNOWN,
EOL_NL,
EOL_CR,
EOL_CRNL
} EolType;
static const char BinarySignature[11] = "PGCOPY\n\377\r\n\0";
/*
* Static communication variables ... pretty grotty, but COPY has
* never been reentrant...
*/
static CopyDest copy_dest;
static FILE *copy_file; /* used if copy_dest == COPY_FILE */
static StringInfo copy_msgbuf; /* used if copy_dest == COPY_NEW_FE */
static bool fe_eof; /* true if detected end of copy data */
static EolType eol_type; /* EOL type of input */
static int client_encoding; /* remote side's character encoding */
static int server_encoding; /* local encoding */
/* these are just for error messages, see copy_in_error_callback */
static bool copy_binary; /* is it a binary copy? */
static const char *copy_relname; /* table name for error messages */
static int copy_lineno; /* line number for error messages */
static const char *copy_attname; /* current att for error messages */
/*
* These static variables are used to avoid incurring overhead for each
* attribute processed. attribute_buf is reused on each CopyReadAttribute
* call to hold the string being read in. Under normal use it will soon
* grow to a suitable size, and then we will avoid palloc/pfree overhead
* for subsequent attributes. Note that CopyReadAttribute returns a pointer
* to attribute_buf's data buffer!
*/
static StringInfoData attribute_buf;
/*
* Similarly, line_buf holds the whole input line being processed (its
* cursor field points to the next character to be read by CopyReadAttribute).
* The input cycle is first to read the whole line into line_buf, convert it
* to server encoding, and then extract individual attribute fields into
* attribute_buf. (We used to have CopyReadAttribute read the input source
* directly, but that caused a lot of encoding issues and unnecessary logic
* complexity.)
*/
static StringInfoData line_buf;
static bool line_buf_converted;
/* non-export function prototypes */
static void DoCopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote,
char *escape, List *force_quote_atts, bool header_line, bool fe_copy);
static void CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote, char *escape,
List *force_quote_atts, bool header_line);
static void CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote, char *escape,
List *force_notnull_atts, bool header_line);
static bool CopyReadLine(char * quote, char * escape);
static char *CopyReadAttribute(const char *delim, const char *null_print,
CopyReadResult *result, bool *isnull);
static char *CopyReadAttributeCSV(const char *delim, const char *null_print,
char *quote, char *escape,
CopyReadResult *result, bool *isnull);
static Datum CopyReadBinaryAttribute(int column_no, FmgrInfo *flinfo,
Oid typioparam, bool *isnull);
static void CopyAttributeOut(char *string, char *delim);
static void CopyAttributeOutCSV(char *string, char *delim, char *quote,
char *escape, bool force_quote);
static List *CopyGetAttnums(Relation rel, List *attnamelist);
static void limit_printout_length(StringInfo buf);
/* Internal communications functions */
static void SendCopyBegin(bool binary, int natts);
static void ReceiveCopyBegin(bool binary, int natts);
static void SendCopyEnd(bool binary);
static void CopySendData(void *databuf, int datasize);
static void CopySendString(const char *str);
static void CopySendChar(char c);
static void CopySendEndOfRow(bool binary);
static void CopyGetData(void *databuf, int datasize);
static int CopyGetChar(void);
#define CopyGetEof() (fe_eof)
static int CopyPeekChar(void);
static void CopyDonePeek(int c, bool pickup);
static void CopySendInt32(int32 val);
static int32 CopyGetInt32(void);
static void CopySendInt16(int16 val);
static int16 CopyGetInt16(void);
/*
* Send copy start/stop messages for frontend copies. These have changed
* in past protocol redesigns.
*/
static void
SendCopyBegin(bool binary, int natts)
{
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
{
/* new way */
StringInfoData buf;
int16 format = (binary ? 1 : 0);
int i;
pq_beginmessage(&buf, 'H');
pq_sendbyte(&buf, format); /* overall format */
pq_sendint(&buf, natts, 2);
for (i = 0; i < natts; i++)
pq_sendint(&buf, format, 2); /* per-column formats */
pq_endmessage(&buf);
copy_dest = COPY_NEW_FE;
copy_msgbuf = makeStringInfo();
}
else if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 2)
{
/* old way */
if (binary)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY BINARY is not supported to stdout or from stdin")));
pq_putemptymessage('H');
/* grottiness needed for old COPY OUT protocol */
pq_startcopyout();
copy_dest = COPY_OLD_FE;
}
else
{
/* very old way */
if (binary)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY BINARY is not supported to stdout or from stdin")));
pq_putemptymessage('B');
/* grottiness needed for old COPY OUT protocol */
pq_startcopyout();
copy_dest = COPY_OLD_FE;
}
}
static void
ReceiveCopyBegin(bool binary, int natts)
{
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
{
/* new way */
StringInfoData buf;
int16 format = (binary ? 1 : 0);
int i;
pq_beginmessage(&buf, 'G');
pq_sendbyte(&buf, format); /* overall format */
pq_sendint(&buf, natts, 2);
for (i = 0; i < natts; i++)
pq_sendint(&buf, format, 2); /* per-column formats */
pq_endmessage(&buf);
copy_dest = COPY_NEW_FE;
copy_msgbuf = makeStringInfo();
}
else if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 2)
{
/* old way */
if (binary)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY BINARY is not supported to stdout or from stdin")));
pq_putemptymessage('G');
copy_dest = COPY_OLD_FE;
}
else
{
/* very old way */
if (binary)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY BINARY is not supported to stdout or from stdin")));
pq_putemptymessage('D');
copy_dest = COPY_OLD_FE;
}
/* We *must* flush here to ensure FE knows it can send. */
pq_flush();
}
static void
SendCopyEnd(bool binary)
{
if (copy_dest == COPY_NEW_FE)
{
if (binary)
{
/* Need to flush out file trailer word */
CopySendEndOfRow(true);
}
else
{
/* Shouldn't have any unsent data */
Assert(copy_msgbuf->len == 0);
}
/* Send Copy Done message */
pq_putemptymessage('c');
}
else
{
/* The FE/BE protocol uses \n as newline for all platforms */
CopySendData("\\.\n", 3);
pq_endcopyout(false);
}
}
/*----------
* CopySendData sends output data to the destination (file or frontend)
* CopySendString does the same for null-terminated strings
* CopySendChar does the same for single characters
* CopySendEndOfRow does the appropriate thing at end of each data row
*
* NB: no data conversion is applied by these functions
*----------
*/
static void
CopySendData(void *databuf, int datasize)
{
switch (copy_dest)
{
case COPY_FILE:
fwrite(databuf, datasize, 1, copy_file);
if (ferror(copy_file))
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not write to COPY file: %m")));
break;
case COPY_OLD_FE:
if (pq_putbytes((char *) databuf, datasize))
{
/* no hope of recovering connection sync, so FATAL */
ereport(FATAL,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("connection lost during COPY to stdout")));
}
break;
case COPY_NEW_FE:
appendBinaryStringInfo(copy_msgbuf, (char *) databuf, datasize);
break;
}
}
static void
CopySendString(const char *str)
{
CopySendData((void *) str, strlen(str));
}
static void
CopySendChar(char c)
{
CopySendData(&c, 1);
}
static void
CopySendEndOfRow(bool binary)
{
switch (copy_dest)
{
case COPY_FILE:
if (!binary)
{
/* Default line termination depends on platform */
#ifndef WIN32
CopySendChar('\n');
#else
CopySendString("\r\n");
#endif
}
break;
case COPY_OLD_FE:
/* The FE/BE protocol uses \n as newline for all platforms */
if (!binary)
CopySendChar('\n');
break;
case COPY_NEW_FE:
/* The FE/BE protocol uses \n as newline for all platforms */
if (!binary)
CopySendChar('\n');
/* Dump the accumulated row as one CopyData message */
(void) pq_putmessage('d', copy_msgbuf->data, copy_msgbuf->len);
/* Reset copy_msgbuf to empty */
copy_msgbuf->len = 0;
copy_msgbuf->data[0] = '\0';
break;
}
}
/*
* CopyGetData reads data from the source (file or frontend)
* CopyGetChar does the same for single characters
*
* CopyGetEof checks if EOF was detected by previous Get operation.
*
* 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 by these functions
*/
static void
CopyGetData(void *databuf, int datasize)
{
switch (copy_dest)
{
case COPY_FILE:
fread(databuf, datasize, 1, copy_file);
if (feof(copy_file))
fe_eof = true;
break;
case COPY_OLD_FE:
if (pq_getbytes((char *) databuf, datasize))
{
/* Only a \. terminator is legal EOF in old protocol */
ereport(ERROR,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("unexpected EOF on client connection")));
}
break;
case COPY_NEW_FE:
while (datasize > 0 && !fe_eof)
{
int avail;
while (copy_msgbuf->cursor >= copy_msgbuf->len)
{
/* Try to receive another message */
int mtype;
readmessage:
mtype = pq_getbyte();
if (mtype == EOF)
ereport(ERROR,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("unexpected EOF on client connection")));
if (pq_getmessage(copy_msgbuf, 0))
ereport(ERROR,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("unexpected EOF on client connection")));
switch (mtype)
{
case 'd': /* CopyData */
break;
case 'c': /* CopyDone */
/* COPY IN correctly terminated by frontend */
fe_eof = true;
return;
case 'f': /* CopyFail */
ereport(ERROR,
(errcode(ERRCODE_QUERY_CANCELED),
errmsg("COPY from stdin failed: %s",
pq_getmsgstring(copy_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 = copy_msgbuf->len - copy_msgbuf->cursor;
if (avail > datasize)
avail = datasize;
pq_copymsgbytes(copy_msgbuf, databuf, avail);
databuf = (void *) ((char *) databuf + avail);
datasize -= avail;
}
break;
}
}
static int
CopyGetChar(void)
{
int ch;
switch (copy_dest)
{
case COPY_FILE:
ch = getc(copy_file);
break;
case COPY_OLD_FE:
ch = pq_getbyte();
if (ch == EOF)
{
/* Only a \. terminator is legal EOF in old protocol */
ereport(ERROR,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("unexpected EOF on client connection")));
}
break;
case COPY_NEW_FE:
{
unsigned char cc;
CopyGetData(&cc, 1);
if (fe_eof)
ch = EOF;
else
ch = cc;
break;
}
default:
ch = EOF;
break;
}
if (ch == EOF)
fe_eof = true;
return ch;
}
/*
* CopyPeekChar reads a byte in "peekable" mode.
*
* after each call to CopyPeekChar, a call to CopyDonePeek _must_
* follow, unless EOF was returned.
*
* CopyDonePeek will either take the peeked char off the stream
* (if pickup is true) or leave it on the stream (if pickup is false).
*/
static int
CopyPeekChar(void)
{
int ch;
switch (copy_dest)
{
case COPY_FILE:
ch = getc(copy_file);
break;
case COPY_OLD_FE:
ch = pq_peekbyte();
if (ch == EOF)
{
/* Only a \. terminator is legal EOF in old protocol */
ereport(ERROR,
(errcode(ERRCODE_CONNECTION_FAILURE),
errmsg("unexpected EOF on client connection")));
}
break;
case COPY_NEW_FE:
{
unsigned char cc;
CopyGetData(&cc, 1);
if (fe_eof)
ch = EOF;
else
ch = cc;
break;
}
default:
ch = EOF;
break;
}
if (ch == EOF)
fe_eof = true;
return ch;
}
static void
CopyDonePeek(int c, bool pickup)
{
if (fe_eof)
return; /* can't unget an EOF */
switch (copy_dest)
{
case COPY_FILE:
if (!pickup)
{
/* We don't want to pick it up - so put it back in there */
ungetc(c, copy_file);
}
/* If we wanted to pick it up, it's already done */
break;
case COPY_OLD_FE:
if (pickup)
{
/* We want to pick it up */
(void) pq_getbyte();
}
/*
* If we didn't want to pick it up, just leave it where it
* sits
*/
break;
case COPY_NEW_FE:
if (!pickup)
{
/* We don't want to pick it up - so put it back in there */
copy_msgbuf->cursor--;
}
/* If we wanted to pick it up, it's already done */
break;
}
}
/*
* These functions do apply some data conversion
*/
/*
* CopySendInt32 sends an int32 in network byte order
*/
static void
CopySendInt32(int32 val)
{
uint32 buf;
buf = htonl((uint32) val);
CopySendData(&buf, sizeof(buf));
}
/*
* CopyGetInt32 reads an int32 that appears in network byte order
*/
static int32
CopyGetInt32(void)
{
uint32 buf;
CopyGetData(&buf, sizeof(buf));
return (int32) ntohl(buf);
}
/*
* CopySendInt16 sends an int16 in network byte order
*/
static void
CopySendInt16(int16 val)
{
uint16 buf;
buf = htons((uint16) val);
CopySendData(&buf, sizeof(buf));
}
/*
* CopyGetInt16 reads an int16 that appears in network byte order
*/
static int16
CopyGetInt16(void)
{
uint16 buf;
CopyGetData(&buf, sizeof(buf));
return (int16) ntohs(buf);
}
/*
* DoCopy executes the SQL COPY statement.
*
* Either unload or reload contents of table <relation>, depending on <from>.
* (<from> = TRUE means we are inserting into the table.)
*
* If <pipe> is false, transfer is between the table and the file named
* <filename>. Otherwise, transfer is between the table and our regular
* input/output stream. The latter could be either stdin/stdout or a
* socket, depending on whether we're running under Postmaster control.
*
* Iff <binary>, unload or reload in the binary format, as opposed to the
* more wasteful but more robust and portable text format.
*
* Iff <oids>, unload or reload the format that includes OID information.
* On input, we accept OIDs whether or not the table has an OID column,
* but silently drop them if it does not. On output, we report an error
* if the user asks for OIDs in a table that has none (not providing an
* OID column might seem friendlier, but could seriously confuse programs).
*
* If in the text format, delimit columns with delimiter <delim> and print
* NULL values as <null_print>.
*
* When loading in the text format from an input stream (as opposed to
* a file), recognize a "." on a line by itself as EOF. Also recognize
* a stream EOF. When unloading in the text format to an output stream,
* write a "." on a line by itself at the end of the data.
*
* Do not allow a Postgres user without superuser privilege to read from
* or write to a file.
*
* Do not allow the copy if user doesn't have proper permission to access
* the table.
*/
void
DoCopy(const CopyStmt *stmt)
{
RangeVar *relation = stmt->relation;
char *filename = stmt->filename;
bool is_from = stmt->is_from;
bool pipe = (stmt->filename == NULL);
ListCell *option;
List *attnamelist = stmt->attlist;
List *attnumlist;
bool fe_copy = false;
bool binary = false;
bool oids = false;
bool csv_mode = false;
bool header_line = false;
char *delim = NULL;
char *quote = NULL;
char *escape = NULL;
char *null_print = NULL;
List *force_quote = NIL;
List *force_notnull = NIL;
List *force_quote_atts = NIL;
List *force_notnull_atts = NIL;
Relation rel;
AclMode required_access = (is_from ? ACL_INSERT : ACL_SELECT);
AclResult aclresult;
/* Extract options from the statement node tree */
foreach(option, stmt->options)
{
DefElem *defel = (DefElem *) lfirst(option);
if (strcmp(defel->defname, "binary") == 0)
{
if (binary)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
binary = intVal(defel->arg);
}
else if (strcmp(defel->defname, "oids") == 0)
{
if (oids)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
oids = intVal(defel->arg);
}
else if (strcmp(defel->defname, "delimiter") == 0)
{
if (delim)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
delim = strVal(defel->arg);
}
else if (strcmp(defel->defname, "null") == 0)
{
if (null_print)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
null_print = strVal(defel->arg);
}
else if (strcmp(defel->defname, "csv") == 0)
{
if (csv_mode)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
csv_mode = intVal(defel->arg);
}
else if (strcmp(defel->defname, "header") == 0)
{
if (header_line)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
header_line = intVal(defel->arg);
}
else if (strcmp(defel->defname, "quote") == 0)
{
if (quote)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
quote = strVal(defel->arg);
}
else if (strcmp(defel->defname, "escape") == 0)
{
if (escape)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
escape = strVal(defel->arg);
}
else if (strcmp(defel->defname, "force_quote") == 0)
{
if (force_quote)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
force_quote = (List *) defel->arg;
}
else if (strcmp(defel->defname, "force_notnull") == 0)
{
if (force_notnull)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("conflicting or redundant options")));
force_notnull = (List *) defel->arg;
}
else
elog(ERROR, "option \"%s\" not recognized",
defel->defname);
}
if (binary && delim)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot specify DELIMITER in BINARY mode")));
if (binary && csv_mode)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot specify CSV in BINARY mode")));
if (binary && null_print)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot specify NULL in BINARY mode")));
/* Set defaults */
if (!delim)
delim = csv_mode ? "," : "\t";
if (!null_print)
null_print = csv_mode ? "" : "\\N";
if (csv_mode)
{
if (!quote)
quote = "\"";
if (!escape)
escape = quote;
}
/* Only single-character delimiter strings are supported. */
if (strlen(delim) != 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY delimiter must be a single character")));
/* Check header */
if (!csv_mode && header_line)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY HEADER available only in CSV mode")));
/* Check quote */
if (!csv_mode && quote != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY quote available only in CSV mode")));
if (csv_mode && strlen(quote) != 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY quote must be a single character")));
/* Check escape */
if (!csv_mode && escape != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY escape available only in CSV mode")));
if (csv_mode && strlen(escape) != 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY escape must be a single character")));
/* Check force_quote */
if (!csv_mode && force_quote != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY force quote available only in CSV mode")));
if (force_quote != NIL && is_from)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY force quote only available using COPY TO")));
/* Check force_notnull */
if (!csv_mode && force_notnull != NIL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY force not null available only in CSV mode")));
if (force_notnull != NIL && !is_from)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY force not null only available using COPY FROM")));
/* Don't allow the delimiter to appear in the null string. */
if (strchr(null_print, delim[0]) != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("COPY delimiter must not appear in the NULL specification")));
/* Don't allow the csv quote char to appear in the null string. */
if (csv_mode && strchr(null_print, quote[0]) != NULL)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("CSV quote character must not appear in the NULL specification")));
/* Open and lock the relation, using the appropriate lock type. */
rel = heap_openrv(relation, (is_from ? RowExclusiveLock : AccessShareLock));
/* check read-only transaction */
if (XactReadOnly && !is_from && !isTempNamespace(RelationGetNamespace(rel)))
ereport(ERROR,
(errcode(ERRCODE_READ_ONLY_SQL_TRANSACTION),
errmsg("transaction is read-only")));
/* Check permissions. */
aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
required_access);
if (aclresult != ACLCHECK_OK)
aclcheck_error(aclresult, ACL_KIND_CLASS,
RelationGetRelationName(rel));
if (!pipe && !superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("must be superuser to COPY to or from a file"),
errhint("Anyone can COPY to stdout or from stdin. "
"psql's \\copy command also works for anyone.")));
/* Don't allow COPY w/ OIDs to or from a table without them */
if (oids && !rel->rd_rel->relhasoids)
ereport(ERROR,
(errcode(ERRCODE_UNDEFINED_COLUMN),
errmsg("table \"%s\" does not have OIDs",
RelationGetRelationName(rel))));
/* Generate or convert list of attributes to process */
attnumlist = CopyGetAttnums(rel, attnamelist);
/* Check that FORCE QUOTE references valid COPY columns */
if (force_quote)
{
TupleDesc tupDesc = RelationGetDescr(rel);
Form_pg_attribute *attr = tupDesc->attrs;
ListCell *cur;
force_quote_atts = CopyGetAttnums(rel, force_quote);
foreach(cur, force_quote_atts)
{
int attnum = lfirst_int(cur);
if (!list_member_int(attnumlist, attnum))
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("FORCE QUOTE column \"%s\" not referenced by COPY",
NameStr(attr[attnum - 1]->attname))));
}
}
/* Check that FORCE NOT NULL references valid COPY columns */
if (force_notnull)
{
ListCell *cur;
TupleDesc tupDesc = RelationGetDescr(rel);
Form_pg_attribute *attr = tupDesc->attrs;
force_notnull_atts = CopyGetAttnums(rel, force_notnull);
foreach(cur, force_notnull_atts)
{
int attnum = lfirst_int(cur);
if (!list_member_int(attnumlist, attnum))
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("FORCE NOT NULL column \"%s\" not referenced by COPY",
NameStr(attr[attnum - 1]->attname))));
}
}
/* Set up variables to avoid per-attribute overhead. */
initStringInfo(&attribute_buf);
initStringInfo(&line_buf);
line_buf_converted = false;
client_encoding = pg_get_client_encoding();
server_encoding = GetDatabaseEncoding();
copy_dest = COPY_FILE; /* default */
copy_file = NULL;
copy_msgbuf = NULL;
fe_eof = false;
if (is_from)
{ /* copy from file to database */
if (rel->rd_rel->relkind != RELKIND_RELATION)
{
if (rel->rd_rel->relkind == RELKIND_VIEW)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy to view \"%s\"",
RelationGetRelationName(rel))));
else if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy to sequence \"%s\"",
RelationGetRelationName(rel))));
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy to non-table relation \"%s\"",
RelationGetRelationName(rel))));
}
if (pipe)
{
if (whereToSendOutput == Remote)
ReceiveCopyBegin(binary, list_length(attnumlist));
else
copy_file = stdin;
}
else
{
struct stat st;
copy_file = AllocateFile(filename, PG_BINARY_R);
if (copy_file == NULL)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open file \"%s\" for reading: %m",
filename)));
fstat(fileno(copy_file), &st);
if (S_ISDIR(st.st_mode))
{
FreeFile(copy_file);
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is a directory", filename)));
}
}
CopyFrom(rel, attnumlist, binary, oids, delim, null_print, csv_mode,
quote, escape, force_notnull_atts, header_line);
}
else
{ /* copy from database to file */
if (rel->rd_rel->relkind != RELKIND_RELATION)
{
if (rel->rd_rel->relkind == RELKIND_VIEW)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy from view \"%s\"",
RelationGetRelationName(rel))));
else if (rel->rd_rel->relkind == RELKIND_SEQUENCE)
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy from sequence \"%s\"",
RelationGetRelationName(rel))));
else
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("cannot copy from non-table relation \"%s\"",
RelationGetRelationName(rel))));
}
if (pipe)
{
if (whereToSendOutput == Remote)
fe_copy = true;
else
copy_file = stdout;
}
else
{
mode_t oumask; /* Pre-existing umask value */
struct stat st;
/*
* Prevent write to relative path ... too easy to shoot
* oneself in the foot by overwriting a database file ...
*/
if (!is_absolute_path(filename))
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("relative path not allowed for COPY to file")));
oumask = umask((mode_t) 022);
copy_file = AllocateFile(filename, PG_BINARY_W);
umask(oumask);
if (copy_file == NULL)
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not open file \"%s\" for writing: %m",
filename)));
fstat(fileno(copy_file), &st);
if (S_ISDIR(st.st_mode))
{
FreeFile(copy_file);
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("\"%s\" is a directory", filename)));
}
}
DoCopyTo(rel, attnumlist, binary, oids, delim, null_print, csv_mode,
quote, escape, force_quote_atts, header_line, fe_copy);
}
if (!pipe)
{
/* we assume only the write case could fail here */
if (FreeFile(copy_file))
ereport(ERROR,
(errcode_for_file_access(),
errmsg("could not write to file \"%s\": %m",
filename)));
}
pfree(attribute_buf.data);
pfree(line_buf.data);
/*
* Close the relation. If reading, we can release the AccessShareLock
* we got; if writing, we should hold the lock until end of
* transaction to ensure that updates will be committed before lock is
* released.
*/
heap_close(rel, (is_from ? NoLock : AccessShareLock));
}
/*
* This intermediate routine just exists to localize the effects of setjmp
* so we don't need to plaster a lot of variables with "volatile".
*/
static void
DoCopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote,
char *escape, List *force_quote_atts, bool header_line, bool fe_copy)
{
PG_TRY();
{
if (fe_copy)
SendCopyBegin(binary, list_length(attnumlist));
CopyTo(rel, attnumlist, binary, oids, delim, null_print, csv_mode,
quote, escape, force_quote_atts, header_line);
if (fe_copy)
SendCopyEnd(binary);
}
PG_CATCH();
{
/*
* Make sure we turn off old-style COPY OUT mode upon error. It is
* okay to do this in all cases, since it does nothing if the mode
* is not on.
*/
pq_endcopyout(true);
PG_RE_THROW();
}
PG_END_TRY();
}
/*
* Copy from relation TO file.
*/
static void
CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote,
char *escape, List *force_quote_atts, bool header_line)
{
HeapTuple tuple;
TupleDesc tupDesc;
HeapScanDesc scandesc;
int num_phys_attrs;
int attr_count;
Form_pg_attribute *attr;
FmgrInfo *out_functions;
bool *force_quote;
char *string;
ListCell *cur;
MemoryContext oldcontext;
MemoryContext mycontext;
tupDesc = rel->rd_att;
attr = tupDesc->attrs;
num_phys_attrs = tupDesc->natts;
attr_count = list_length(attnumlist);
/* Get info about the columns we need to process. */
out_functions = (FmgrInfo *) palloc(num_phys_attrs * sizeof(FmgrInfo));
force_quote = (bool *) palloc(num_phys_attrs * sizeof(bool));
foreach(cur, attnumlist)
{
int attnum = lfirst_int(cur);
Oid out_func_oid;
bool isvarlena;
if (binary)
getTypeBinaryOutputInfo(attr[attnum - 1]->atttypid,
&out_func_oid,
&isvarlena);
else
getTypeOutputInfo(attr[attnum - 1]->atttypid,
&out_func_oid,
&isvarlena);
fmgr_info(out_func_oid, &out_functions[attnum - 1]);
if (list_member_int(force_quote_atts, attnum))
force_quote[attnum - 1] = true;
else
force_quote[attnum - 1] = false;
}
/*
* Create a temporary memory context that we can reset once per row to
* recover palloc'd memory. This avoids any problems with leaks
* inside datatype output routines, and should be faster than retail
* pfree's anyway. (We don't need a whole econtext as CopyFrom does.)
*/
mycontext = AllocSetContextCreate(CurrentMemoryContext,
"COPY TO",
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE);
if (binary)
{
/* Generate header for a binary copy */
int32 tmp;
/* Signature */
CopySendData((char *) BinarySignature, 11);
/* Flags field */
tmp = 0;
if (oids)
tmp |= (1 << 16);
CopySendInt32(tmp);
/* No header extension */
tmp = 0;
CopySendInt32(tmp);
}
else
{
/*
* For non-binary copy, we need to convert null_print to client
* encoding, because it will be sent directly with CopySendString.
*/
if (server_encoding != client_encoding)
null_print = (char *)
pg_server_to_client((unsigned char *) null_print,
strlen(null_print));
/* if a header has been requested send the line */
if (header_line)
{
bool hdr_delim = false;
char *colname;
foreach(cur, attnumlist)
{
int attnum = lfirst_int(cur);
if (hdr_delim)
CopySendChar(delim[0]);
hdr_delim = true;
colname = NameStr(attr[attnum - 1]->attname);
CopyAttributeOutCSV(colname, delim, quote, escape,
strcmp(colname, null_print) == 0);
}
CopySendEndOfRow(binary);
}
}
scandesc = heap_beginscan(rel, ActiveSnapshot, 0, NULL);
while ((tuple = heap_getnext(scandesc, ForwardScanDirection)) != NULL)
{
bool need_delim = false;
CHECK_FOR_INTERRUPTS();
MemoryContextReset(mycontext);
oldcontext = MemoryContextSwitchTo(mycontext);
if (binary)
{
/* Binary per-tuple header */
CopySendInt16(attr_count);
/* Send OID if wanted --- note attr_count doesn't include it */
if (oids)
{
Oid oid = HeapTupleGetOid(tuple);
/* Hack --- assume Oid is same size as int32 */
CopySendInt32(sizeof(int32));
CopySendInt32(oid);
}
}
else
{
/* Text format has no per-tuple header, but send OID if wanted */
if (oids)
{
string = DatumGetCString(DirectFunctionCall1(oidout,
ObjectIdGetDatum(HeapTupleGetOid(tuple))));
CopySendString(string);
need_delim = true;
}
}
foreach(cur, attnumlist)
{
int attnum = lfirst_int(cur);
Datum value;
bool isnull;
value = heap_getattr(tuple, attnum, tupDesc, &isnull);
if (!binary)
{
if (need_delim)
CopySendChar(delim[0]);
need_delim = true;
}
if (isnull)
{
if (!binary)
CopySendString(null_print); /* null indicator */
else
CopySendInt32(-1); /* null marker */
}
else
{
if (!binary)
{
string = DatumGetCString(FunctionCall1(&out_functions[attnum - 1],
value));
if (csv_mode)
{
CopyAttributeOutCSV(string, delim, quote, escape,
(strcmp(string, null_print) == 0 ||
force_quote[attnum - 1]));
}
else
CopyAttributeOut(string, delim);
}
else
{
bytea *outputbytes;
outputbytes = DatumGetByteaP(FunctionCall1(&out_functions[attnum - 1],
value));
/* We assume the result will not have been toasted */
CopySendInt32(VARSIZE(outputbytes) - VARHDRSZ);
CopySendData(VARDATA(outputbytes),
VARSIZE(outputbytes) - VARHDRSZ);
}
}
}
CopySendEndOfRow(binary);
MemoryContextSwitchTo(oldcontext);
}
heap_endscan(scandesc);
if (binary)
{
/* Generate trailer for a binary copy */
CopySendInt16(-1);
}
MemoryContextDelete(mycontext);
pfree(out_functions);
pfree(force_quote);
}
/*
* error context callback for COPY FROM
*/
static void
copy_in_error_callback(void *arg)
{
if (copy_binary)
{
/* can't usefully display the data */
if (copy_attname)
errcontext("COPY %s, line %d, column %s",
copy_relname, copy_lineno, copy_attname);
else
errcontext("COPY %s, line %d", copy_relname, copy_lineno);
}
else
{
if (copy_attname)
{
/* error is relevant to a particular column */
limit_printout_length(&attribute_buf);
errcontext("COPY %s, line %d, column %s: \"%s\"",
copy_relname, copy_lineno, copy_attname,
attribute_buf.data);
}
else
{
/* error is relevant to a particular line */
if (line_buf_converted ||
client_encoding == server_encoding)
{
limit_printout_length(&line_buf);
errcontext("COPY %s, line %d: \"%s\"",
copy_relname, copy_lineno,
line_buf.data);
}
else
{
/*
* Here, the line buffer is still in a foreign encoding,
* and indeed it's quite likely that the error is precisely
* a failure to do encoding conversion (ie, bad data). We
* dare not try to convert it, and at present there's no way
* to regurgitate it without conversion. So we have to punt
* and just report the line number.
*/
errcontext("COPY %s, line %d", copy_relname, copy_lineno);
}
}
}
}
/*
* Make sure we don't print an unreasonable amount of COPY data in a message.
*
* It would seem a lot easier to just use the sprintf "precision" limit to
* truncate the string. However, some versions of glibc have a bug/misfeature
* that vsnprintf will always fail (return -1) if it is asked to truncate
* a string that contains invalid byte sequences for the current encoding.
* So, do our own truncation. We assume we can alter the StringInfo buffer
* holding the input data.
*/
static void
limit_printout_length(StringInfo buf)
{
#define MAX_COPY_DATA_DISPLAY 100
int len;
/* Fast path if definitely okay */
if (buf->len <= MAX_COPY_DATA_DISPLAY)
return;
/* Apply encoding-dependent truncation */
len = pg_mbcliplen(buf->data, buf->len, MAX_COPY_DATA_DISPLAY);
if (buf->len <= len)
return; /* no need to truncate */
buf->len = len;
buf->data[len] = '\0';
/* Add "..." to show we truncated the input */
appendStringInfoString(buf, "...");
}
/*
* Copy FROM file to relation.
*/
static void
CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
char *delim, char *null_print, bool csv_mode, char *quote,
char *escape, List *force_notnull_atts, bool header_line)
{
HeapTuple tuple;
TupleDesc tupDesc;
Form_pg_attribute *attr;
AttrNumber num_phys_attrs,
attr_count,
num_defaults;
FmgrInfo *in_functions;
FmgrInfo oid_in_function;
Oid *typioparams;
Oid oid_typioparam;
ExprState **constraintexprs;
bool *force_notnull;
bool hasConstraints = false;
int attnum;
int i;
Oid in_func_oid;
Datum *values;
char *nulls;
bool done = false;
bool isnull;
ResultRelInfo *resultRelInfo;
EState *estate = CreateExecutorState(); /* for ExecConstraints() */
TupleTableSlot *slot;
bool file_has_oids;
int *defmap;
ExprState **defexprs; /* array of default att expressions */
ExprContext *econtext; /* used for ExecEvalExpr for default atts */
MemoryContext oldcontext = CurrentMemoryContext;
ErrorContextCallback errcontext;
tupDesc = RelationGetDescr(rel);
attr = tupDesc->attrs;
num_phys_attrs = tupDesc->natts;
attr_count = list_length(attnumlist);
num_defaults = 0;
/*
* We need a ResultRelInfo so we can use the regular executor's
* index-entry-making machinery. (There used to be a huge amount of
* code here that basically duplicated execUtils.c ...)
*/
resultRelInfo = makeNode(ResultRelInfo);
resultRelInfo->ri_RangeTableIndex = 1; /* dummy */
resultRelInfo->ri_RelationDesc = rel;
resultRelInfo->ri_TrigDesc = CopyTriggerDesc(rel->trigdesc);
if (resultRelInfo->ri_TrigDesc)
resultRelInfo->ri_TrigFunctions = (FmgrInfo *)
palloc0(resultRelInfo->ri_TrigDesc->numtriggers * sizeof(FmgrInfo));
resultRelInfo->ri_TrigInstrument = NULL;
ExecOpenIndices(resultRelInfo);
estate->es_result_relations = resultRelInfo;
estate->es_num_result_relations = 1;
estate->es_result_relation_info = resultRelInfo;
/* Set up a tuple slot too */
slot = MakeSingleTupleTableSlot(tupDesc);
econtext = GetPerTupleExprContext(estate);
/*
* Pick up the required catalog information for each attribute in the
* relation, including the input function, the element type (to pass
* to the input function), and info about defaults and constraints.
* (Which input function we use depends on text/binary format choice.)
*/
in_functions = (FmgrInfo *) palloc(num_phys_attrs * sizeof(FmgrInfo));
typioparams = (Oid *) palloc(num_phys_attrs * sizeof(Oid));
defmap = (int *) palloc(num_phys_attrs * sizeof(int));
defexprs = (ExprState **) palloc(num_phys_attrs * sizeof(ExprState *));
constraintexprs = (ExprState **) palloc0(num_phys_attrs * sizeof(ExprState *));
force_notnull = (bool *) palloc(num_phys_attrs * sizeof(bool));
for (attnum = 1; attnum <= num_phys_attrs; attnum++)
{
/* We don't need info for dropped attributes */
if (attr[attnum - 1]->attisdropped)
continue;
/* Fetch the input function and typioparam info */
if (binary)
getTypeBinaryInputInfo(attr[attnum - 1]->atttypid,
&in_func_oid, &typioparams[attnum - 1]);
else
getTypeInputInfo(attr[attnum - 1]->atttypid,
&in_func_oid, &typioparams[attnum - 1]);
fmgr_info(in_func_oid, &in_functions[attnum - 1]);
if (list_member_int(force_notnull_atts, attnum))
force_notnull[attnum - 1] = true;
else
force_notnull[attnum - 1] = false;
/* Get default info if needed */
if (!list_member_int(attnumlist, attnum))
{
/* attribute is NOT to be copied from input */
/* use default value if one exists */
Node *defexpr = build_column_default(rel, attnum);
if (defexpr != NULL)
{
defexprs[num_defaults] = ExecPrepareExpr((Expr *) defexpr,
estate);
defmap[num_defaults] = attnum - 1;
num_defaults++;
}
}
/* If it's a domain type, set up to check domain constraints */
if (get_typtype(attr[attnum - 1]->atttypid) == 'd')
{
Param *prm;
Node *node;
/*
* Easiest way to do this is to use parse_coerce.c to set up
* an expression that checks the constraints. (At present,
* the expression might contain a length-coercion-function
* call and/or CoerceToDomain nodes.) The bottom of the
* expression is a Param node so that we can fill in the
* actual datum during the data input loop.
*/
prm = makeNode(Param);
prm->paramkind = PARAM_EXEC;
prm->paramid = 0;
prm->paramtype = getBaseType(attr[attnum - 1]->atttypid);
node = coerce_to_domain((Node *) prm,
prm->paramtype,
attr[attnum - 1]->atttypid,
COERCE_IMPLICIT_CAST, false, false);
constraintexprs[attnum - 1] = ExecPrepareExpr((Expr *) node,
estate);
hasConstraints = true;
}
}
/* Prepare to catch AFTER triggers. */
AfterTriggerBeginQuery();
/*
* Check BEFORE STATEMENT insertion triggers. It's debateable whether
* we should do this for COPY, since it's not really an "INSERT"
* statement as such. However, executing these triggers maintains
* consistency with the EACH ROW triggers that we already fire on
* COPY.
*/
ExecBSInsertTriggers(estate, resultRelInfo);
if (!binary)
file_has_oids = oids; /* must rely on user to tell us this... */
else
{
/* Read and verify binary header */
char readSig[11];
int32 tmp;
/* Signature */
CopyGetData(readSig, 11);
if (CopyGetEof() || memcmp(readSig, BinarySignature, 11) != 0)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("COPY file signature not recognized")));
/* Flags field */
tmp = CopyGetInt32();
if (CopyGetEof())
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("invalid COPY file header (missing flags)")));
file_has_oids = (tmp & (1 << 16)) != 0;
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 */
tmp = CopyGetInt32();
if (CopyGetEof() || 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)
{
CopyGetData(readSig, 1);
if (CopyGetEof())
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("invalid COPY file header (wrong length)")));
}
}
if (file_has_oids && binary)
{
getTypeBinaryInputInfo(OIDOID,
&in_func_oid, &oid_typioparam);
fmgr_info(in_func_oid, &oid_in_function);
}
values = (Datum *) palloc(num_phys_attrs * sizeof(Datum));
nulls = (char *) palloc(num_phys_attrs * sizeof(char));
/* Make room for a PARAM_EXEC value for domain constraint checks */
if (hasConstraints)
econtext->ecxt_param_exec_vals = (ParamExecData *)
palloc0(sizeof(ParamExecData));
/* Initialize static variables */
fe_eof = false;
eol_type = EOL_UNKNOWN;
copy_binary = binary;
copy_relname = RelationGetRelationName(rel);
copy_lineno = 0;
copy_attname = NULL;
/* Set up callback to identify error line number */
errcontext.callback = copy_in_error_callback;
errcontext.arg = NULL;
errcontext.previous = error_context_stack;
error_context_stack = &errcontext;
/* on input just throw the header line away */
if (header_line)
{
copy_lineno++;
done = CopyReadLine(quote, escape) ;
}
while (!done)
{
bool skip_tuple;
Oid loaded_oid = InvalidOid;
CHECK_FOR_INTERRUPTS();
copy_lineno++;
/* Reset the per-tuple exprcontext */
ResetPerTupleExprContext(estate);
/* Switch into its memory context */
MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
/* Initialize all values for row to NULL */
MemSet(values, 0, num_phys_attrs * sizeof(Datum));
MemSet(nulls, 'n', num_phys_attrs * sizeof(char));
if (!binary)
{
CopyReadResult result = NORMAL_ATTR;
char *string;
ListCell *cur;
/* Actually read the line into memory here */
done = csv_mode ?
CopyReadLine(quote, escape) : CopyReadLine(NULL, NULL);
/*
* 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 && line_buf.len == 0)
break;
if (file_has_oids)
{
/* can't be in CSV mode here */
string = CopyReadAttribute(delim, null_print,
&result, &isnull);
if (isnull)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("null OID in COPY data")));
else
{
copy_attname = "oid";
loaded_oid = DatumGetObjectId(DirectFunctionCall1(oidin,
CStringGetDatum(string)));
if (loaded_oid == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("invalid OID in COPY data")));
copy_attname = NULL;
}
}
/* Loop to read the user attributes on the line. */
foreach(cur, attnumlist)
{
int attnum = lfirst_int(cur);
int m = attnum - 1;
/*
* If prior attr on this line was ended by newline,
* complain.
*/
if (result != NORMAL_ATTR)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("missing data for column \"%s\"",
NameStr(attr[m]->attname))));
if (csv_mode)
{
string = CopyReadAttributeCSV(delim, null_print, quote,
escape, &result, &isnull);
if (result == UNTERMINATED_FIELD)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unterminated CSV quoted field")));
}
else
string = CopyReadAttribute(delim, null_print,
&result, &isnull);
if (csv_mode && isnull && force_notnull[m])
{
string = null_print; /* set to NULL string */
isnull = false;
}
/* we read an SQL NULL, no need to do anything */
if (!isnull)
{
copy_attname = NameStr(attr[m]->attname);
values[m] = FunctionCall3(&in_functions[m],
CStringGetDatum(string),
ObjectIdGetDatum(typioparams[m]),
Int32GetDatum(attr[m]->atttypmod));
nulls[m] = ' ';
copy_attname = NULL;
}
}
/*
* Complain if there are more fields on the input line.
*
* Special case: if we're reading a zero-column table, we won't
* yet have called CopyReadAttribute() at all; so no error if
* line is empty.
*/
if (result == NORMAL_ATTR && line_buf.len != 0)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("extra data after last expected column")));
}
else
{
/* binary */
int16 fld_count;
ListCell *cur;
fld_count = CopyGetInt16();
if (CopyGetEof() || fld_count == -1)
{
done = true;
break;
}
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)));
if (file_has_oids)
{
copy_attname = "oid";
loaded_oid =
DatumGetObjectId(CopyReadBinaryAttribute(0,
&oid_in_function,
oid_typioparam,
&isnull));
if (isnull || loaded_oid == InvalidOid)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("invalid OID in COPY data")));
copy_attname = NULL;
}
i = 0;
foreach(cur, attnumlist)
{
int attnum = lfirst_int(cur);
int m = attnum - 1;
copy_attname = NameStr(attr[m]->attname);
i++;
values[m] = CopyReadBinaryAttribute(i,
&in_functions[m],
typioparams[m],
&isnull);
nulls[m] = isnull ? 'n' : ' ';
copy_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++)
{
values[defmap[i]] = ExecEvalExpr(defexprs[i], econtext,
&isnull, NULL);
if (!isnull)
nulls[defmap[i]] = ' ';
}
/* Next apply any domain constraints */
if (hasConstraints)
{
ParamExecData *prmdata = &econtext->ecxt_param_exec_vals[0];
for (i = 0; i < num_phys_attrs; i++)
{
ExprState *exprstate = constraintexprs[i];
if (exprstate == NULL)
continue; /* no constraint for this attr */
/* Insert current row's value into the Param value */
prmdata->value = values[i];
prmdata->isnull = (nulls[i] == 'n');
/*
* Execute the constraint expression. Allow the
* expression to replace the value (consider e.g. a
* timestamp precision restriction).
*/
values[i] = ExecEvalExpr(exprstate, econtext,
&isnull, NULL);
nulls[i] = isnull ? 'n' : ' ';
}
}
/* And now we can form the input tuple. */
tuple = heap_formtuple(tupDesc, values, nulls);
if (oids && file_has_oids)
HeapTupleSetOid(tuple, loaded_oid);
/* Triggers and stuff need to be invoked in query context. */
MemoryContextSwitchTo(oldcontext);
skip_tuple = false;
/* BEFORE ROW INSERT Triggers */
if (resultRelInfo->ri_TrigDesc &&
resultRelInfo->ri_TrigDesc->n_before_row[TRIGGER_EVENT_INSERT] > 0)
{
HeapTuple newtuple;
newtuple = ExecBRInsertTriggers(estate, resultRelInfo, tuple);
if (newtuple == NULL) /* "do nothing" */
skip_tuple = true;
else if (newtuple != tuple) /* modified by Trigger(s) */
{
heap_freetuple(tuple);
tuple = newtuple;
}
}
if (!skip_tuple)
{
/* Place tuple in tuple slot */
ExecStoreTuple(tuple, slot, InvalidBuffer, false);
/* Check the constraints of the tuple */
if (rel->rd_att->constr)
ExecConstraints(resultRelInfo, slot, estate);
/* OK, store the tuple and create index entries for it */
simple_heap_insert(rel, tuple);
if (resultRelInfo->ri_NumIndices > 0)
ExecInsertIndexTuples(slot, &(tuple->t_self), estate, false);
/* AFTER ROW INSERT Triggers */
ExecARInsertTriggers(estate, resultRelInfo, tuple);
}
}
/* Done, clean up */
error_context_stack = errcontext.previous;
MemoryContextSwitchTo(oldcontext);
/* Execute AFTER STATEMENT insertion triggers */
ExecASInsertTriggers(estate, resultRelInfo);
/* Handle queued AFTER triggers */
AfterTriggerEndQuery(estate);
pfree(values);
pfree(nulls);
pfree(in_functions);
pfree(typioparams);
pfree(defmap);
pfree(defexprs);
pfree(constraintexprs);
pfree(force_notnull);
ExecDropSingleTupleTableSlot(slot);
ExecCloseIndices(resultRelInfo);
FreeExecutorState(estate);
}
/*
* 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.
*/
static bool
CopyReadLine(char * quote, char * escape)
{
bool result;
bool change_encoding = (client_encoding != server_encoding);
int c;
int mblen;
int j;
unsigned char s[2];
char *cvt;
bool in_quote = false, last_was_esc = false, csv_mode = false;
char quotec = '\0', escapec = '\0';
if (quote)
{
csv_mode = true;
quotec = quote[0];
escapec = escape[0];
/* ignore special escape processing if it's the same as quotec */
if (quotec == escapec)
escapec = '\0';
}
s[1] = 0;
/* reset line_buf to empty */
line_buf.len = 0;
line_buf.data[0] = '\0';
line_buf.cursor = 0;
/* mark that encoding conversion hasn't occurred yet */
line_buf_converted = false;
/* set default status */
result = false;
/*
* In this loop we only care for detecting newlines (\r and/or \n) and
* the end-of-copy marker (\.).
*
* In Text mode, for backwards compatibility we allow
* backslashes to escape newline characters. Backslashes other than
* the end marker get put into the line_buf, since CopyReadAttribute
* does its own escape processing.
*
* In CSV mode, CR and NL inside q 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 only these four, are assumed the same in
* frontend and backend encodings.
*
* We do not assume that second and later bytes of a frontend
* multibyte character couldn't look like ASCII characters.
*/
for (;;)
{
c = CopyGetChar();
if (c == EOF)
{
result = true;
break;
}
if (csv_mode)
{
/*
* 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 a 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.
*/
if (in_quote && c == (eol_type == EOL_CR ? '\r' : '\n'))
copy_lineno++;
}
if (!in_quote && c == '\r')
{
if (eol_type == EOL_NL)
{
if (! csv_mode)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("literal carriage return found in data"),
errhint("Use \"\\r\" to represent carriage return.")));
else
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unquoted carriage return found in CSV data"),
errhint("Use quoted CSV field to represent carriage return.")));
}
/* Check for \r\n on first line, _and_ handle \r\n. */
if (eol_type == EOL_UNKNOWN || eol_type == EOL_CRNL)
{
int c2 = CopyPeekChar();
if (c2 == '\n')
{
CopyDonePeek(c2, true); /* eat newline */
eol_type = EOL_CRNL;
}
else
{
/* found \r, but no \n */
if (eol_type == EOL_CRNL)
{
if (!csv_mode)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("literal carriage return found in data"),
errhint("Use \"\\r\" to represent carriage return.")));
else
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unquoted carriage return found in data"),
errhint("Use quoted CSV field to represent carriage return.")));
}
/*
* if we got here, it is the first line and we didn't
* get \n, so put it back
*/
CopyDonePeek(c2, false);
eol_type = EOL_CR;
}
}
break;
}
if (!in_quote && c == '\n')
{
if (eol_type == EOL_CR || eol_type == EOL_CRNL)
{
if (!csv_mode)
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("literal newline found in data"),
errhint("Use \"\\n\" to represent newline.")));
else
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unquoted newline found in data"),
errhint("Use quoted CSV field to represent newline.")));
}
eol_type = EOL_NL;
break;
}
if ((line_buf.len == 0 || !csv_mode) && c == '\\')
{
int c2;
if (csv_mode)
c2 = CopyPeekChar();
else
c2 = c = CopyGetChar();
if (c2 == EOF)
{
result = true;
if (csv_mode)
CopyDonePeek(c2, true);
break;
}
if (c2 == '.')
{
if (csv_mode)
CopyDonePeek(c2, true); /* allow keep calling GetChar() */
if (eol_type == EOL_CRNL)
{
c = CopyGetChar();
if (c == '\n')
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("end-of-copy marker does not match previous newline style")));
if (c != '\r')
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("end-of-copy marker corrupt")));
}
c = CopyGetChar();
if (c != '\r' && c != '\n')
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("end-of-copy marker corrupt")));
if ((eol_type == EOL_NL && c != '\n') ||
(eol_type == EOL_CRNL && c != '\n') ||
(eol_type == EOL_CR && c != '\r'))
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("end-of-copy marker does not match previous newline style")));
/*
* 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 (copy_dest == COPY_NEW_FE)
{
while (c != EOF)
c = CopyGetChar();
}
result = true; /* report EOF */
break;
}
if (csv_mode)
CopyDonePeek(c2, false); /* not a dot, so put it back */
else
/* not EOF mark, so emit \ and following char literally */
appendStringInfoCharMacro(&line_buf, '\\');
}
appendStringInfoCharMacro(&line_buf, c);
/*
* When client encoding != server, must be careful to read the
* extra bytes of a multibyte character exactly, since the
* encoding might not ensure they don't look like ASCII. When the
* encodings are the same, we need not do this, since no server
* encoding we use has ASCII-like following bytes.
*/
if (change_encoding)
{
s[0] = c;
mblen = pg_encoding_mblen(client_encoding, s);
for (j = 1; j < mblen; j++)
{
c = CopyGetChar();
if (c == EOF)
{
result = true;
break;
}
appendStringInfoCharMacro(&line_buf, c);
}
if (result)
break; /* out of outer loop */
}
} /* end of outer loop */
/* Done reading the line. Convert it to server encoding. */
if (change_encoding)
{
cvt = (char *) pg_client_to_server((unsigned char *) line_buf.data,
line_buf.len);
if (cvt != line_buf.data)
{
/* transfer converted data back to line_buf */
line_buf.len = 0;
line_buf.data[0] = '\0';
appendBinaryStringInfo(&line_buf, cvt, strlen(cvt));
}
}
/* Now it's safe to use the buffer in error messages */
line_buf_converted = true;
return result;
}
/*
* Return decimal value for a hexadecimal digit
*/
static
int GetDecimalFromHex(char hex)
{
if (isdigit(hex))
return hex - '0';
else
return tolower(hex) - 'a' + 10;
}
/*----------
* Read the value of a single attribute, performing de-escaping as needed.
*
* 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.
*
* *result is set to indicate what terminated the read:
* NORMAL_ATTR: column delimiter
* END_OF_LINE: end of line
* In either case, the string read up to the terminator is returned.
*
* *isnull is set true or false depending on whether the input matched
* the null marker. Note that the caller cannot check this since the
* returned string will be the post-de-escaping equivalent, which may
* look the same as some valid data string.
*----------
*/
static char *
CopyReadAttribute(const char *delim, const char *null_print,
CopyReadResult *result, bool *isnull)
{
char c;
char delimc = delim[0];
int start_cursor = line_buf.cursor;
int end_cursor;
int input_len;
/* reset attribute_buf to empty */
attribute_buf.len = 0;
attribute_buf.data[0] = '\0';
/* set default status */
*result = END_OF_LINE;
for (;;)
{
end_cursor = line_buf.cursor;
if (line_buf.cursor >= line_buf.len)
break;
c = line_buf.data[line_buf.cursor++];
if (c == delimc)
{
*result = NORMAL_ATTR;
break;
}
if (c == '\\')
{
if (line_buf.cursor >= line_buf.len)
break;
c = line_buf.data[line_buf.cursor++];
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 (line_buf.cursor < line_buf.len)
{
c = line_buf.data[line_buf.cursor];
if (ISOCTAL(c))
{
line_buf.cursor++;
val = (val << 3) + OCTVALUE(c);
if (line_buf.cursor < line_buf.len)
{
c = line_buf.data[line_buf.cursor];
if (ISOCTAL(c))
{
line_buf.cursor++;
val = (val << 3) + OCTVALUE(c);
}
}
}
}
c = val & 0377;
}
break;
case 'x':
/* Handle \x3F */
if (line_buf.cursor < line_buf.len)
{
char hexchar = line_buf.data[line_buf.cursor];
if (isxdigit(hexchar))
{
int val = GetDecimalFromHex(hexchar);
line_buf.cursor++;
if (line_buf.cursor < line_buf.len)
{
hexchar = line_buf.data[line_buf.cursor];
if (isxdigit(hexchar))
{
line_buf.cursor++;
val = (val << 4) + GetDecimalFromHex(hexchar);
}
}
c = val & 0xff;
}
}
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
*/
}
}
appendStringInfoCharMacro(&attribute_buf, c);
}
/* check whether raw input matched null marker */
input_len = end_cursor - start_cursor;
if (input_len == strlen(null_print) &&
strncmp(&line_buf.data[start_cursor], null_print, input_len) == 0)
*isnull = true;
else
*isnull = false;
return attribute_buf.data;
}
/*
* Read the value of a single attribute in CSV mode,
* performing de-escaping as needed. Escaping does not follow the normal
* PostgreSQL text mode, but instead "standard" (i.e. common) CSV usage.
*
* Quoted fields can span lines, in which case the line end is embedded
* in the returned string.
*
* null_print is the null marker string. Note that this is compared to
* the pre-de-escaped input string (thus if it is quoted it is not a NULL).
*
* *result is set to indicate what terminated the read:
* NORMAL_ATTR: column delimiter
* END_OF_LINE: end of line
* UNTERMINATED_FIELD no quote detected at end of a quoted field
*
* In any case, the string read up to the terminator (or end of file)
* is returned.
*
* *isnull is set true or false depending on whether the input matched
* the null marker. Note that the caller cannot check this since the
* returned string will be the post-de-escaping equivalent, which may
* look the same as some valid data string.
*----------
*/
static char *
CopyReadAttributeCSV(const char *delim, const char *null_print, char *quote,
char *escape, CopyReadResult *result, bool *isnull)
{
char delimc = delim[0];
char quotec = quote[0];
char escapec = escape[0];
char c;
int start_cursor = line_buf.cursor;
int end_cursor = start_cursor;
int input_len;
bool in_quote = false;
bool saw_quote = false;
/* reset attribute_buf to empty */
attribute_buf.len = 0;
attribute_buf.data[0] = '\0';
/* set default status */
*result = END_OF_LINE;
for (;;)
{
end_cursor = line_buf.cursor;
if (line_buf.cursor >= line_buf.len)
break;
c = line_buf.data[line_buf.cursor++];
/* unquoted field delimiter */
if (!in_quote && c == delimc)
{
*result = NORMAL_ATTR;
break;
}
/* start of quoted field (or part of field) */
if (!in_quote && c == quotec)
{
saw_quote = true;
in_quote = true;
continue;
}
/* escape within a quoted field */
if (in_quote && c == escapec)
{
/*
* peek at the next char if available, and escape it if it is
* an escape char or a quote char
*/
if (line_buf.cursor <= line_buf.len)
{
char nextc = line_buf.data[line_buf.cursor];
if (nextc == escapec || nextc == quotec)
{
appendStringInfoCharMacro(&attribute_buf, nextc);
line_buf.cursor++;
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 (in_quote && c == quotec)
{
in_quote = false;
continue;
}
appendStringInfoCharMacro(&attribute_buf, c);
}
if (in_quote)
*result = UNTERMINATED_FIELD;
/* check whether raw input matched null marker */
input_len = end_cursor - start_cursor;
if (!saw_quote && input_len == strlen(null_print) &&
strncmp(&line_buf.data[start_cursor], null_print, input_len) == 0)
*isnull = true;
else
*isnull = false;
return attribute_buf.data;
}
/*
* Read a binary attribute
*/
static Datum
CopyReadBinaryAttribute(int column_no, FmgrInfo *flinfo, Oid typioparam,
bool *isnull)
{
int32 fld_size;
Datum result;
fld_size = CopyGetInt32();
if (CopyGetEof())
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unexpected EOF in COPY data")));
if (fld_size == -1)
{
*isnull = true;
return (Datum) 0;
}
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 */
attribute_buf.len = 0;
attribute_buf.data[0] = '\0';
attribute_buf.cursor = 0;
enlargeStringInfo(&attribute_buf, fld_size);
CopyGetData(attribute_buf.data, fld_size);
if (CopyGetEof())
ereport(ERROR,
(errcode(ERRCODE_BAD_COPY_FILE_FORMAT),
errmsg("unexpected EOF in COPY data")));
attribute_buf.len = fld_size;
attribute_buf.data[fld_size] = '\0';
/* Call the column type's binary input converter */
result = FunctionCall2(flinfo,
PointerGetDatum(&attribute_buf),
ObjectIdGetDatum(typioparam));
/* Trouble if it didn't eat the whole buffer */
if (attribute_buf.cursor != attribute_buf.len)
ereport(ERROR,
(errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
errmsg("incorrect binary data format")));
*isnull = false;
return result;
}
/*
* Send text representation of one attribute, with conversion and escaping
*/
static void
CopyAttributeOut(char *server_string, char *delim)
{
char *string;
char c;
char delimc = delim[0];
bool same_encoding;
int mblen;
int i;
same_encoding = (server_encoding == client_encoding);
if (!same_encoding)
string = (char *) pg_server_to_client((unsigned char *) server_string,
strlen(server_string));
else
string = server_string;
for (; (c = *string) != '\0'; string += mblen)
{
mblen = 1;
switch (c)
{
case '\b':
CopySendString("\\b");
break;
case '\f':
CopySendString("\\f");
break;
case '\n':
CopySendString("\\n");
break;
case '\r':
CopySendString("\\r");
break;
case '\t':
CopySendString("\\t");
break;
case '\v':
CopySendString("\\v");
break;
case '\\':
CopySendString("\\\\");
break;
default:
if (c == delimc)
CopySendChar('\\');
CopySendChar(c);
/*
* We can skip pg_encoding_mblen() overhead when encoding
* is same, because in valid backend encodings, extra
* bytes of a multibyte character never look like ASCII.
*/
if (!same_encoding)
{
/* send additional bytes of the char, if any */
mblen = pg_encoding_mblen(client_encoding, string);
for (i = 1; i < mblen; i++)
CopySendChar(string[i]);
}
break;
}
}
}
/*
* Send CSV representation of one attribute, with conversion and
* CSV type escaping
*/
static void
CopyAttributeOutCSV(char *server_string, char *delim, char *quote,
char *escape, bool use_quote)
{
char *string;
char c;
char delimc = delim[0];
char quotec = quote[0];
char escapec = escape[0];
char *test_string;
bool same_encoding;
int mblen;
int i;
same_encoding = (server_encoding == client_encoding);
if (!same_encoding)
string = (char *) pg_server_to_client((unsigned char *) server_string,
strlen(server_string));
else
string = server_string;
/*
* have to run through the string twice, first time to see if it needs
* quoting, second to actually send it
*/
for (test_string = string;
!use_quote && (c = *test_string) != '\0';
test_string += mblen)
{
if (c == delimc || c == quotec || c == '\n' || c == '\r')
use_quote = true;
if (!same_encoding)
mblen = pg_encoding_mblen(client_encoding, test_string);
else
mblen = 1;
}
if (use_quote)
CopySendChar(quotec);
for (; (c = *string) != '\0'; string += mblen)
{
if (use_quote && (c == quotec || c == escapec))
CopySendChar(escapec);
CopySendChar(c);
if (!same_encoding)
{
/* send additional bytes of the char, if any */
mblen = pg_encoding_mblen(client_encoding, string);
for (i = 1; i < mblen; i++)
CopySendChar(string[i]);
}
else
mblen = 1;
}
if (use_quote)
CopySendChar(quotec);
}
/*
* CopyGetAttnums - build an integer list of attnums to be copied
*
* The input attnamelist is either the user-specified column list,
* or NIL if there was none (in which case we want all the non-dropped
* columns).
*/
static List *
CopyGetAttnums(Relation rel, List *attnamelist)
{
List *attnums = NIL;
if (attnamelist == NIL)
{
/* Generate default column list */
TupleDesc tupDesc = RelationGetDescr(rel);
Form_pg_attribute *attr = tupDesc->attrs;
int attr_count = tupDesc->natts;
int i;
for (i = 0; i < attr_count; i++)
{
if (attr[i]->attisdropped)
continue;
attnums = lappend_int(attnums, i + 1);
}
}
else
{
/* Validate the user-supplied list and extract attnums */
ListCell *l;
foreach(l, attnamelist)
{
char *name = strVal(lfirst(l));
int attnum;
/* Lookup column name, ereport on failure */
/* Note we disallow system columns here */
attnum = attnameAttNum(rel, name, false);
/* Check for duplicates */
if (list_member_int(attnums, attnum))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name)));
attnums = lappend_int(attnums, attnum);
}
}
return attnums;
}
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