1/*-------------------------------------------------------------------------
2 *
3 * libpq-fe.h
4 * This file contains definitions for structures and
5 * externs for functions used by frontend postgres applications.
6 *
7 * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
8 * Portions Copyright (c) 1994, Regents of the University of California
9 *
10 * src/interfaces/libpq/libpq-fe.h
11 *
12 *-------------------------------------------------------------------------
13 */
14
15#ifndef LIBPQ_FE_H
16#define LIBPQ_FE_H
17
18#ifdef __cplusplus
19extern "C"
20{
21#endif
22
23#include <stdio.h>
24
25/*
26 * postgres_ext.h defines the backend's externally visible types,
27 * such as Oid.
28 */
29#include "postgres_ext.h"
30
31/*
32 * Option flags for PQcopyResult
33 */
34#define PG_COPYRES_ATTRS 0x01
35#define PG_COPYRES_TUPLES 0x02 /* Implies PG_COPYRES_ATTRS */
36#define PG_COPYRES_EVENTS 0x04
37#define PG_COPYRES_NOTICEHOOKS 0x08
38
39/* Application-visible enum types */
40
41/*
42 * Although it is okay to add to these lists, values which become unused
43 * should never be removed, nor should constants be redefined - that would
44 * break compatibility with existing code.
45 */
46
47typedef enum
48{
49 CONNECTION_OK,
50 CONNECTION_BAD,
51 /* Non-blocking mode only below here */
52
53 /*
54 * The existence of these should never be relied upon - they should only
55 * be used for user feedback or similar purposes.
56 */
57 CONNECTION_STARTED, /* Waiting for connection to be made. */
58 CONNECTION_MADE, /* Connection OK; waiting to send. */
59 CONNECTION_AWAITING_RESPONSE, /* Waiting for a response from the
60 * postmaster. */
61 CONNECTION_AUTH_OK, /* Received authentication; waiting for
62 * backend startup. */
63 CONNECTION_SETENV, /* Negotiating environment. */
64 CONNECTION_SSL_STARTUP, /* Negotiating SSL. */
65 CONNECTION_NEEDED, /* Internal state: connect() needed */
66 CONNECTION_CHECK_WRITABLE, /* Check if we could make a writable
67 * connection. */
68 CONNECTION_CONSUME, /* Wait for any pending message and consume
69 * them. */
70 CONNECTION_GSS_STARTUP /* Negotiating GSSAPI. */
71} ConnStatusType;
72
73typedef enum
74{
75 PGRES_POLLING_FAILED = 0,
76 PGRES_POLLING_READING, /* These two indicate that one may */
77 PGRES_POLLING_WRITING, /* use select before polling again. */
78 PGRES_POLLING_OK,
79 PGRES_POLLING_ACTIVE /* unused; keep for awhile for backwards
80 * compatibility */
81} PostgresPollingStatusType;
82
83typedef enum
84{
85 PGRES_EMPTY_QUERY = 0, /* empty query string was executed */
86 PGRES_COMMAND_OK, /* a query command that doesn't return
87 * anything was executed properly by the
88 * backend */
89 PGRES_TUPLES_OK, /* a query command that returns tuples was
90 * executed properly by the backend, PGresult
91 * contains the result tuples */
92 PGRES_COPY_OUT, /* Copy Out data transfer in progress */
93 PGRES_COPY_IN, /* Copy In data transfer in progress */
94 PGRES_BAD_RESPONSE, /* an unexpected response was recv'd from the
95 * backend */
96 PGRES_NONFATAL_ERROR, /* notice or warning message */
97 PGRES_FATAL_ERROR, /* query failed */
98 PGRES_COPY_BOTH, /* Copy In/Out data transfer in progress */
99 PGRES_SINGLE_TUPLE /* single tuple from larger resultset */
100} ExecStatusType;
101
102typedef enum
103{
104 PQTRANS_IDLE, /* connection idle */
105 PQTRANS_ACTIVE, /* command in progress */
106 PQTRANS_INTRANS, /* idle, within transaction block */
107 PQTRANS_INERROR, /* idle, within failed transaction */
108 PQTRANS_UNKNOWN /* cannot determine status */
109} PGTransactionStatusType;
110
111typedef enum
112{
113 PQERRORS_TERSE, /* single-line error messages */
114 PQERRORS_DEFAULT, /* recommended style */
115 PQERRORS_VERBOSE, /* all the facts, ma'am */
116 PQERRORS_SQLSTATE /* only error severity and SQLSTATE code */
117} PGVerbosity;
118
119typedef enum
120{
121 PQSHOW_CONTEXT_NEVER, /* never show CONTEXT field */
122 PQSHOW_CONTEXT_ERRORS, /* show CONTEXT for errors only (default) */
123 PQSHOW_CONTEXT_ALWAYS /* always show CONTEXT field */
124} PGContextVisibility;
125
126/*
127 * PGPing - The ordering of this enum should not be altered because the
128 * values are exposed externally via pg_isready.
129 */
130
131typedef enum
132{
133 PQPING_OK, /* server is accepting connections */
134 PQPING_REJECT, /* server is alive but rejecting connections */
135 PQPING_NO_RESPONSE, /* could not establish connection */
136 PQPING_NO_ATTEMPT /* connection not attempted (bad params) */
137} PGPing;
138
139/* PGconn encapsulates a connection to the backend.
140 * The contents of this struct are not supposed to be known to applications.
141 */
142typedef struct pg_conn PGconn;
143
144/* PGresult encapsulates the result of a query (or more precisely, of a single
145 * SQL command --- a query string given to PQsendQuery can contain multiple
146 * commands and thus return multiple PGresult objects).
147 * The contents of this struct are not supposed to be known to applications.
148 */
149typedef struct pg_result PGresult;
150
151/* PGcancel encapsulates the information needed to cancel a running
152 * query on an existing connection.
153 * The contents of this struct are not supposed to be known to applications.
154 */
155typedef struct pg_cancel PGcancel;
156
157/* PGnotify represents the occurrence of a NOTIFY message.
158 * Ideally this would be an opaque typedef, but it's so simple that it's
159 * unlikely to change.
160 * NOTE: in Postgres 6.4 and later, the be_pid is the notifying backend's,
161 * whereas in earlier versions it was always your own backend's PID.
162 */
163typedef struct pgNotify
164{
165 char *relname; /* notification condition name */
166 int be_pid; /* process ID of notifying server process */
167 char *extra; /* notification parameter */
168 /* Fields below here are private to libpq; apps should not use 'em */
169 struct pgNotify *next; /* list link */
170} PGnotify;
171
172/* Function types for notice-handling callbacks */
173typedef void (*PQnoticeReceiver) (void *arg, const PGresult *res);
174typedef void (*PQnoticeProcessor) (void *arg, const char *message);
175
176/* Print options for PQprint() */
177typedef char pqbool;
178
179typedef struct _PQprintOpt
180{
181 pqbool header; /* print output field headings and row count */
182 pqbool align; /* fill align the fields */
183 pqbool standard; /* old brain dead format */
184 pqbool html3; /* output html tables */
185 pqbool expanded; /* expand tables */
186 pqbool pager; /* use pager for output if needed */
187 char *fieldSep; /* field separator */
188 char *tableOpt; /* insert to HTML <table ...> */
189 char *caption; /* HTML <caption> */
190 char **fieldName; /* null terminated array of replacement field
191 * names */
192} PQprintOpt;
193
194/* ----------------
195 * Structure for the conninfo parameter definitions returned by PQconndefaults
196 * or PQconninfoParse.
197 *
198 * All fields except "val" point at static strings which must not be altered.
199 * "val" is either NULL or a malloc'd current-value string. PQconninfoFree()
200 * will release both the val strings and the PQconninfoOption array itself.
201 * ----------------
202 */
203typedef struct _PQconninfoOption
204{
205 char *keyword; /* The keyword of the option */
206 char *envvar; /* Fallback environment variable name */
207 char *compiled; /* Fallback compiled in default value */
208 char *val; /* Option's current value, or NULL */
209 char *label; /* Label for field in connect dialog */
210 char *dispchar; /* Indicates how to display this field in a
211 * connect dialog. Values are: "" Display
212 * entered value as is "*" Password field -
213 * hide value "D" Debug option - don't show
214 * by default */
215 int dispsize; /* Field size in characters for dialog */
216} PQconninfoOption;
217
218/* ----------------
219 * PQArgBlock -- structure for PQfn() arguments
220 * ----------------
221 */
222typedef struct
223{
224 int len;
225 int isint;
226 union
227 {
228 int *ptr; /* can't use void (dec compiler barfs) */
229 int integer;
230 } u;
231} PQArgBlock;
232
233/* ----------------
234 * PGresAttDesc -- Data about a single attribute (column) of a query result
235 * ----------------
236 */
237typedef struct pgresAttDesc
238{
239 char *name; /* column name */
240 Oid tableid; /* source table, if known */
241 int columnid; /* source column, if known */
242 int format; /* format code for value (text/binary) */
243 Oid typid; /* type id */
244 int typlen; /* type size */
245 int atttypmod; /* type-specific modifier info */
246} PGresAttDesc;
247
248/* ----------------
249 * Exported functions of libpq
250 * ----------------
251 */
252
253/* === in fe-connect.c === */
254
255/* make a new client connection to the backend */
256/* Asynchronous (non-blocking) */
257extern PGconn *PQconnectStart(const char *conninfo);
258extern PGconn *PQconnectStartParams(const char *const *keywords,
259 const char *const *values, int expand_dbname);
260extern PostgresPollingStatusType PQconnectPoll(PGconn *conn);
261
262/* Synchronous (blocking) */
263extern PGconn *PQconnectdb(const char *conninfo);
264extern PGconn *PQconnectdbParams(const char *const *keywords,
265 const char *const *values, int expand_dbname);
266extern PGconn *PQsetdbLogin(const char *pghost, const char *pgport,
267 const char *pgoptions, const char *pgtty,
268 const char *dbName,
269 const char *login, const char *pwd);
270
271#define PQsetdb(M_PGHOST,M_PGPORT,M_PGOPT,M_PGTTY,M_DBNAME) \
272 PQsetdbLogin(M_PGHOST, M_PGPORT, M_PGOPT, M_PGTTY, M_DBNAME, NULL, NULL)
273
274/* close the current connection and free the PGconn data structure */
275extern void PQfinish(PGconn *conn);
276
277/* get info about connection options known to PQconnectdb */
278extern PQconninfoOption *PQconndefaults(void);
279
280/* parse connection options in same way as PQconnectdb */
281extern PQconninfoOption *PQconninfoParse(const char *conninfo, char **errmsg);
282
283/* return the connection options used by a live connection */
284extern PQconninfoOption *PQconninfo(PGconn *conn);
285
286/* free the data structure returned by PQconndefaults() or PQconninfoParse() */
287extern void PQconninfoFree(PQconninfoOption *connOptions);
288
289/*
290 * close the current connection and restablish a new one with the same
291 * parameters
292 */
293/* Asynchronous (non-blocking) */
294extern int PQresetStart(PGconn *conn);
295extern PostgresPollingStatusType PQresetPoll(PGconn *conn);
296
297/* Synchronous (blocking) */
298extern void PQreset(PGconn *conn);
299
300/* request a cancel structure */
301extern PGcancel *PQgetCancel(PGconn *conn);
302
303/* free a cancel structure */
304extern void PQfreeCancel(PGcancel *cancel);
305
306/* issue a cancel request */
307extern int PQcancel(PGcancel *cancel, char *errbuf, int errbufsize);
308
309/* backwards compatible version of PQcancel; not thread-safe */
310extern int PQrequestCancel(PGconn *conn);
311
312/* Accessor functions for PGconn objects */
313extern char *PQdb(const PGconn *conn);
314extern char *PQuser(const PGconn *conn);
315extern char *PQpass(const PGconn *conn);
316extern char *PQhost(const PGconn *conn);
317extern char *PQhostaddr(const PGconn *conn);
318extern char *PQport(const PGconn *conn);
319extern char *PQtty(const PGconn *conn);
320extern char *PQoptions(const PGconn *conn);
321extern ConnStatusType PQstatus(const PGconn *conn);
322extern PGTransactionStatusType PQtransactionStatus(const PGconn *conn);
323extern const char *PQparameterStatus(const PGconn *conn,
324 const char *paramName);
325extern int PQprotocolVersion(const PGconn *conn);
326extern int PQserverVersion(const PGconn *conn);
327extern char *PQerrorMessage(const PGconn *conn);
328extern int PQsocket(const PGconn *conn);
329extern int PQbackendPID(const PGconn *conn);
330extern int PQconnectionNeedsPassword(const PGconn *conn);
331extern int PQconnectionUsedPassword(const PGconn *conn);
332extern int PQclientEncoding(const PGconn *conn);
333extern int PQsetClientEncoding(PGconn *conn, const char *encoding);
334
335/* SSL information functions */
336extern int PQsslInUse(PGconn *conn);
337extern void *PQsslStruct(PGconn *conn, const char *struct_name);
338extern const char *PQsslAttribute(PGconn *conn, const char *attribute_name);
339extern const char *const *PQsslAttributeNames(PGconn *conn);
340
341/* Get the OpenSSL structure associated with a connection. Returns NULL for
342 * unencrypted connections or if any other TLS library is in use. */
343extern void *PQgetssl(PGconn *conn);
344
345/* Tell libpq whether it needs to initialize OpenSSL */
346extern void PQinitSSL(int do_init);
347
348/* More detailed way to tell libpq whether it needs to initialize OpenSSL */
349extern void PQinitOpenSSL(int do_ssl, int do_crypto);
350
351/* Return true if GSSAPI encryption is in use */
352extern int PQgssEncInUse(PGconn *conn);
353
354/* Returns GSSAPI context if GSSAPI is in use */
355extern void *PQgetgssctx(PGconn *conn);
356
357/* Set verbosity for PQerrorMessage and PQresultErrorMessage */
358extern PGVerbosity PQsetErrorVerbosity(PGconn *conn, PGVerbosity verbosity);
359
360/* Set CONTEXT visibility for PQerrorMessage and PQresultErrorMessage */
361extern PGContextVisibility PQsetErrorContextVisibility(PGconn *conn,
362 PGContextVisibility show_context);
363
364/* Enable/disable tracing */
365extern void PQtrace(PGconn *conn, FILE *debug_port);
366extern void PQuntrace(PGconn *conn);
367
368/* Override default notice handling routines */
369extern PQnoticeReceiver PQsetNoticeReceiver(PGconn *conn,
370 PQnoticeReceiver proc,
371 void *arg);
372extern PQnoticeProcessor PQsetNoticeProcessor(PGconn *conn,
373 PQnoticeProcessor proc,
374 void *arg);
375
376/*
377 * Used to set callback that prevents concurrent access to
378 * non-thread safe functions that libpq needs.
379 * The default implementation uses a libpq internal mutex.
380 * Only required for multithreaded apps that use kerberos
381 * both within their app and for postgresql connections.
382 */
383typedef void (*pgthreadlock_t) (int acquire);
384
385extern pgthreadlock_t PQregisterThreadLock(pgthreadlock_t newhandler);
386
387/* === in fe-exec.c === */
388
389/* Simple synchronous query */
390extern PGresult *PQexec(PGconn *conn, const char *query);
391extern PGresult *PQexecParams(PGconn *conn,
392 const char *command,
393 int nParams,
394 const Oid *paramTypes,
395 const char *const *paramValues,
396 const int *paramLengths,
397 const int *paramFormats,
398 int resultFormat);
399extern PGresult *PQprepare(PGconn *conn, const char *stmtName,
400 const char *query, int nParams,
401 const Oid *paramTypes);
402extern PGresult *PQexecPrepared(PGconn *conn,
403 const char *stmtName,
404 int nParams,
405 const char *const *paramValues,
406 const int *paramLengths,
407 const int *paramFormats,
408 int resultFormat);
409
410/* Interface for multiple-result or asynchronous queries */
411extern int PQsendQuery(PGconn *conn, const char *query);
412extern int PQsendQueryParams(PGconn *conn,
413 const char *command,
414 int nParams,
415 const Oid *paramTypes,
416 const char *const *paramValues,
417 const int *paramLengths,
418 const int *paramFormats,
419 int resultFormat);
420extern int PQsendPrepare(PGconn *conn, const char *stmtName,
421 const char *query, int nParams,
422 const Oid *paramTypes);
423extern int PQsendQueryPrepared(PGconn *conn,
424 const char *stmtName,
425 int nParams,
426 const char *const *paramValues,
427 const int *paramLengths,
428 const int *paramFormats,
429 int resultFormat);
430extern int PQsetSingleRowMode(PGconn *conn);
431extern PGresult *PQgetResult(PGconn *conn);
432
433/* Routines for managing an asynchronous query */
434extern int PQisBusy(PGconn *conn);
435extern int PQconsumeInput(PGconn *conn);
436
437/* LISTEN/NOTIFY support */
438extern PGnotify *PQnotifies(PGconn *conn);
439
440/* Routines for copy in/out */
441extern int PQputCopyData(PGconn *conn, const char *buffer, int nbytes);
442extern int PQputCopyEnd(PGconn *conn, const char *errormsg);
443extern int PQgetCopyData(PGconn *conn, char **buffer, int async);
444
445/* Deprecated routines for copy in/out */
446extern int PQgetline(PGconn *conn, char *string, int length);
447extern int PQputline(PGconn *conn, const char *string);
448extern int PQgetlineAsync(PGconn *conn, char *buffer, int bufsize);
449extern int PQputnbytes(PGconn *conn, const char *buffer, int nbytes);
450extern int PQendcopy(PGconn *conn);
451
452/* Set blocking/nonblocking connection to the backend */
453extern int PQsetnonblocking(PGconn *conn, int arg);
454extern int PQisnonblocking(const PGconn *conn);
455extern int PQisthreadsafe(void);
456extern PGPing PQping(const char *conninfo);
457extern PGPing PQpingParams(const char *const *keywords,
458 const char *const *values, int expand_dbname);
459
460/* Force the write buffer to be written (or at least try) */
461extern int PQflush(PGconn *conn);
462
463/*
464 * "Fast path" interface --- not really recommended for application
465 * use
466 */
467extern PGresult *PQfn(PGconn *conn,
468 int fnid,
469 int *result_buf,
470 int *result_len,
471 int result_is_int,
472 const PQArgBlock *args,
473 int nargs);
474
475/* Accessor functions for PGresult objects */
476extern ExecStatusType PQresultStatus(const PGresult *res);
477extern char *PQresStatus(ExecStatusType status);
478extern char *PQresultErrorMessage(const PGresult *res);
479extern char *PQresultVerboseErrorMessage(const PGresult *res,
480 PGVerbosity verbosity,
481 PGContextVisibility show_context);
482extern char *PQresultErrorField(const PGresult *res, int fieldcode);
483extern int PQntuples(const PGresult *res);
484extern int PQnfields(const PGresult *res);
485extern int PQbinaryTuples(const PGresult *res);
486extern char *PQfname(const PGresult *res, int field_num);
487extern int PQfnumber(const PGresult *res, const char *field_name);
488extern Oid PQftable(const PGresult *res, int field_num);
489extern int PQftablecol(const PGresult *res, int field_num);
490extern int PQfformat(const PGresult *res, int field_num);
491extern Oid PQftype(const PGresult *res, int field_num);
492extern int PQfsize(const PGresult *res, int field_num);
493extern int PQfmod(const PGresult *res, int field_num);
494extern char *PQcmdStatus(PGresult *res);
495extern char *PQoidStatus(const PGresult *res); /* old and ugly */
496extern Oid PQoidValue(const PGresult *res); /* new and improved */
497extern char *PQcmdTuples(PGresult *res);
498extern char *PQgetvalue(const PGresult *res, int tup_num, int field_num);
499extern int PQgetlength(const PGresult *res, int tup_num, int field_num);
500extern int PQgetisnull(const PGresult *res, int tup_num, int field_num);
501extern int PQnparams(const PGresult *res);
502extern Oid PQparamtype(const PGresult *res, int param_num);
503
504/* Describe prepared statements and portals */
505extern PGresult *PQdescribePrepared(PGconn *conn, const char *stmt);
506extern PGresult *PQdescribePortal(PGconn *conn, const char *portal);
507extern int PQsendDescribePrepared(PGconn *conn, const char *stmt);
508extern int PQsendDescribePortal(PGconn *conn, const char *portal);
509
510/* Delete a PGresult */
511extern void PQclear(PGresult *res);
512
513/* For freeing other alloc'd results, such as PGnotify structs */
514extern void PQfreemem(void *ptr);
515
516/* Exists for backward compatibility. bjm 2003-03-24 */
517#define PQfreeNotify(ptr) PQfreemem(ptr)
518
519/* Error when no password was given. */
520/* Note: depending on this is deprecated; use PQconnectionNeedsPassword(). */
521#define PQnoPasswordSupplied "fe_sendauth: no password supplied\n"
522
523/* Create and manipulate PGresults */
524extern PGresult *PQmakeEmptyPGresult(PGconn *conn, ExecStatusType status);
525extern PGresult *PQcopyResult(const PGresult *src, int flags);
526extern int PQsetResultAttrs(PGresult *res, int numAttributes, PGresAttDesc *attDescs);
527extern void *PQresultAlloc(PGresult *res, size_t nBytes);
528extern size_t PQresultMemorySize(const PGresult *res);
529extern int PQsetvalue(PGresult *res, int tup_num, int field_num, char *value, int len);
530
531/* Quoting strings before inclusion in queries. */
532extern size_t PQescapeStringConn(PGconn *conn,
533 char *to, const char *from, size_t length,
534 int *error);
535extern char *PQescapeLiteral(PGconn *conn, const char *str, size_t len);
536extern char *PQescapeIdentifier(PGconn *conn, const char *str, size_t len);
537extern unsigned char *PQescapeByteaConn(PGconn *conn,
538 const unsigned char *from, size_t from_length,
539 size_t *to_length);
540extern unsigned char *PQunescapeBytea(const unsigned char *strtext,
541 size_t *retbuflen);
542
543/* These forms are deprecated! */
544extern size_t PQescapeString(char *to, const char *from, size_t length);
545extern unsigned char *PQescapeBytea(const unsigned char *from, size_t from_length,
546 size_t *to_length);
547
548
549
550/* === in fe-print.c === */
551
552extern void PQprint(FILE *fout, /* output stream */
553 const PGresult *res,
554 const PQprintOpt *ps); /* option structure */
555
556/*
557 * really old printing routines
558 */
559extern void PQdisplayTuples(const PGresult *res,
560 FILE *fp, /* where to send the output */
561 int fillAlign, /* pad the fields with spaces */
562 const char *fieldSep, /* field separator */
563 int printHeader, /* display headers? */
564 int quiet);
565
566extern void PQprintTuples(const PGresult *res,
567 FILE *fout, /* output stream */
568 int printAttName, /* print attribute names */
569 int terseOutput, /* delimiter bars */
570 int width); /* width of column, if 0, use variable
571 * width */
572
573
574/* === in fe-lobj.c === */
575
576/* Large-object access routines */
577extern int lo_open(PGconn *conn, Oid lobjId, int mode);
578extern int lo_close(PGconn *conn, int fd);
579extern int lo_read(PGconn *conn, int fd, char *buf, size_t len);
580extern int lo_write(PGconn *conn, int fd, const char *buf, size_t len);
581extern int lo_lseek(PGconn *conn, int fd, int offset, int whence);
582extern pg_int64 lo_lseek64(PGconn *conn, int fd, pg_int64 offset, int whence);
583extern Oid lo_creat(PGconn *conn, int mode);
584extern Oid lo_create(PGconn *conn, Oid lobjId);
585extern int lo_tell(PGconn *conn, int fd);
586extern pg_int64 lo_tell64(PGconn *conn, int fd);
587extern int lo_truncate(PGconn *conn, int fd, size_t len);
588extern int lo_truncate64(PGconn *conn, int fd, pg_int64 len);
589extern int lo_unlink(PGconn *conn, Oid lobjId);
590extern Oid lo_import(PGconn *conn, const char *filename);
591extern Oid lo_import_with_oid(PGconn *conn, const char *filename, Oid lobjId);
592extern int lo_export(PGconn *conn, Oid lobjId, const char *filename);
593
594/* === in fe-misc.c === */
595
596/* Get the version of the libpq library in use */
597extern int PQlibVersion(void);
598
599/* Determine length of multibyte encoded char at *s */
600extern int PQmblen(const char *s, int encoding);
601
602/* Determine display length of multibyte encoded char at *s */
603extern int PQdsplen(const char *s, int encoding);
604
605/* Get encoding id from environment variable PGCLIENTENCODING */
606extern int PQenv2encoding(void);
607
608/* === in fe-auth.c === */
609
610extern char *PQencryptPassword(const char *passwd, const char *user);
611extern char *PQencryptPasswordConn(PGconn *conn, const char *passwd, const char *user, const char *algorithm);
612
613/* === in encnames.c === */
614
615extern int pg_char_to_encoding(const char *name);
616extern const char *pg_encoding_to_char(int encoding);
617extern int pg_valid_server_encoding_id(int encoding);
618
619#ifdef __cplusplus
620}
621#endif
622
623#endif /* LIBPQ_FE_H */
624