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) 1996-2017, 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 19 extern "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 47 typedef 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 } ConnStatusType; 71 72 typedef enum 73 { 74 PGRES_POLLING_FAILED = 0, 75 PGRES_POLLING_READING, /* These two indicate that one may */ 76 PGRES_POLLING_WRITING, /* use select before polling again. */ 77 PGRES_POLLING_OK, 78 PGRES_POLLING_ACTIVE /* unused; keep for awhile for backwards 79 * compatibility */ 80 } PostgresPollingStatusType; 81 82 typedef enum 83 { 84 PGRES_EMPTY_QUERY = 0, /* empty query string was executed */ 85 PGRES_COMMAND_OK, /* a query command that doesn't return 86 * anything was executed properly by the 87 * backend */ 88 PGRES_TUPLES_OK, /* a query command that returns tuples was 89 * executed properly by the backend, PGresult 90 * contains the result tuples */ 91 PGRES_COPY_OUT, /* Copy Out data transfer in progress */ 92 PGRES_COPY_IN, /* Copy In data transfer in progress */ 93 PGRES_BAD_RESPONSE, /* an unexpected response was recv'd from the 94 * backend */ 95 PGRES_NONFATAL_ERROR, /* notice or warning message */ 96 PGRES_FATAL_ERROR, /* query failed */ 97 PGRES_COPY_BOTH, /* Copy In/Out data transfer in progress */ 98 PGRES_SINGLE_TUPLE /* single tuple from larger resultset */ 99 } ExecStatusType; 100 101 typedef enum 102 { 103 PQTRANS_IDLE, /* connection idle */ 104 PQTRANS_ACTIVE, /* command in progress */ 105 PQTRANS_INTRANS, /* idle, within transaction block */ 106 PQTRANS_INERROR, /* idle, within failed transaction */ 107 PQTRANS_UNKNOWN /* cannot determine status */ 108 } PGTransactionStatusType; 109 110 typedef enum 111 { 112 PQERRORS_TERSE, /* single-line error messages */ 113 PQERRORS_DEFAULT, /* recommended style */ 114 PQERRORS_VERBOSE /* all the facts, ma'am */ 115 } PGVerbosity; 116 117 typedef enum 118 { 119 PQSHOW_CONTEXT_NEVER, /* never show CONTEXT field */ 120 PQSHOW_CONTEXT_ERRORS, /* show CONTEXT for errors only (default) */ 121 PQSHOW_CONTEXT_ALWAYS /* always show CONTEXT field */ 122 } PGContextVisibility; 123 124 /* 125 * PGPing - The ordering of this enum should not be altered because the 126 * values are exposed externally via pg_isready. 127 */ 128 129 typedef enum 130 { 131 PQPING_OK, /* server is accepting connections */ 132 PQPING_REJECT, /* server is alive but rejecting connections */ 133 PQPING_NO_RESPONSE, /* could not establish connection */ 134 PQPING_NO_ATTEMPT /* connection not attempted (bad params) */ 135 } PGPing; 136 137 /* PGconn encapsulates a connection to the backend. 138 * The contents of this struct are not supposed to be known to applications. 139 */ 140 typedef struct pg_conn PGconn; 141 142 /* PGresult encapsulates the result of a query (or more precisely, of a single 143 * SQL command --- a query string given to PQsendQuery can contain multiple 144 * commands and thus return multiple PGresult objects). 145 * The contents of this struct are not supposed to be known to applications. 146 */ 147 typedef struct pg_result PGresult; 148 149 /* PGcancel encapsulates the information needed to cancel a running 150 * query on an existing connection. 151 * The contents of this struct are not supposed to be known to applications. 152 */ 153 typedef struct pg_cancel PGcancel; 154 155 /* PGnotify represents the occurrence of a NOTIFY message. 156 * Ideally this would be an opaque typedef, but it's so simple that it's 157 * unlikely to change. 158 * NOTE: in Postgres 6.4 and later, the be_pid is the notifying backend's, 159 * whereas in earlier versions it was always your own backend's PID. 160 */ 161 typedef struct pgNotify 162 { 163 char *relname; /* notification condition name */ 164 int be_pid; /* process ID of notifying server process */ 165 char *extra; /* notification parameter */ 166 /* Fields below here are private to libpq; apps should not use 'em */ 167 struct pgNotify *next; /* list link */ 168 } PGnotify; 169 170 /* Function types for notice-handling callbacks */ 171 typedef void (*PQnoticeReceiver) (void *arg, const PGresult *res); 172 typedef void (*PQnoticeProcessor) (void *arg, const char *message); 173 174 /* Print options for PQprint() */ 175 typedef char pqbool; 176 177 typedef struct _PQprintOpt 178 { 179 pqbool header; /* print output field headings and row count */ 180 pqbool align; /* fill align the fields */ 181 pqbool standard; /* old brain dead format */ 182 pqbool html3; /* output html tables */ 183 pqbool expanded; /* expand tables */ 184 pqbool pager; /* use pager for output if needed */ 185 char *fieldSep; /* field separator */ 186 char *tableOpt; /* insert to HTML <table ...> */ 187 char *caption; /* HTML <caption> */ 188 char **fieldName; /* null terminated array of replacement field 189 * names */ 190 } PQprintOpt; 191 192 /* ---------------- 193 * Structure for the conninfo parameter definitions returned by PQconndefaults 194 * or PQconninfoParse. 195 * 196 * All fields except "val" point at static strings which must not be altered. 197 * "val" is either NULL or a malloc'd current-value string. PQconninfoFree() 198 * will release both the val strings and the PQconninfoOption array itself. 199 * ---------------- 200 */ 201 typedef struct _PQconninfoOption 202 { 203 char *keyword; /* The keyword of the option */ 204 char *envvar; /* Fallback environment variable name */ 205 char *compiled; /* Fallback compiled in default value */ 206 char *val; /* Option's current value, or NULL */ 207 char *label; /* Label for field in connect dialog */ 208 char *dispchar; /* Indicates how to display this field in a 209 * connect dialog. Values are: "" Display 210 * entered value as is "*" Password field - 211 * hide value "D" Debug option - don't show 212 * by default */ 213 int dispsize; /* Field size in characters for dialog */ 214 } PQconninfoOption; 215 216 /* ---------------- 217 * PQArgBlock -- structure for PQfn() arguments 218 * ---------------- 219 */ 220 typedef struct 221 { 222 int len; 223 int isint; 224 union 225 { 226 int *ptr; /* can't use void (dec compiler barfs) */ 227 int integer; 228 } u; 229 } PQArgBlock; 230 231 /* ---------------- 232 * PGresAttDesc -- Data about a single attribute (column) of a query result 233 * ---------------- 234 */ 235 typedef struct pgresAttDesc 236 { 237 char *name; /* column name */ 238 Oid tableid; /* source table, if known */ 239 int columnid; /* source column, if known */ 240 int format; /* format code for value (text/binary) */ 241 Oid typid; /* type id */ 242 int typlen; /* type size */ 243 int atttypmod; /* type-specific modifier info */ 244 } PGresAttDesc; 245 246 /* ---------------- 247 * Exported functions of libpq 248 * ---------------- 249 */ 250 251 /* === in fe-connect.c === */ 252 253 /* make a new client connection to the backend */ 254 /* Asynchronous (non-blocking) */ 255 extern PGconn *PQconnectStart(const char *conninfo); 256 extern PGconn *PQconnectStartParams(const char *const *keywords, 257 const char *const *values, int expand_dbname); 258 extern PostgresPollingStatusType PQconnectPoll(PGconn *conn); 259 260 /* Synchronous (blocking) */ 261 extern PGconn *PQconnectdb(const char *conninfo); 262 extern PGconn *PQconnectdbParams(const char *const *keywords, 263 const char *const *values, int expand_dbname); 264 extern PGconn *PQsetdbLogin(const char *pghost, const char *pgport, 265 const char *pgoptions, const char *pgtty, 266 const char *dbName, 267 const char *login, const char *pwd); 268 269 #define PQsetdb(M_PGHOST,M_PGPORT,M_PGOPT,M_PGTTY,M_DBNAME) \ 270 PQsetdbLogin(M_PGHOST, M_PGPORT, M_PGOPT, M_PGTTY, M_DBNAME, NULL, NULL) 271 272 /* close the current connection and free the PGconn data structure */ 273 extern void PQfinish(PGconn *conn); 274 275 /* get info about connection options known to PQconnectdb */ 276 extern PQconninfoOption *PQconndefaults(void); 277 278 /* parse connection options in same way as PQconnectdb */ 279 extern PQconninfoOption *PQconninfoParse(const char *conninfo, char **errmsg); 280 281 /* return the connection options used by a live connection */ 282 extern PQconninfoOption *PQconninfo(PGconn *conn); 283 284 /* free the data structure returned by PQconndefaults() or PQconninfoParse() */ 285 extern void PQconninfoFree(PQconninfoOption *connOptions); 286 287 /* 288 * close the current connection and restablish a new one with the same 289 * parameters 290 */ 291 /* Asynchronous (non-blocking) */ 292 extern int PQresetStart(PGconn *conn); 293 extern PostgresPollingStatusType PQresetPoll(PGconn *conn); 294 295 /* Synchronous (blocking) */ 296 extern void PQreset(PGconn *conn); 297 298 /* request a cancel structure */ 299 extern PGcancel *PQgetCancel(PGconn *conn); 300 301 /* free a cancel structure */ 302 extern void PQfreeCancel(PGcancel *cancel); 303 304 /* issue a cancel request */ 305 extern int PQcancel(PGcancel *cancel, char *errbuf, int errbufsize); 306 307 /* backwards compatible version of PQcancel; not thread-safe */ 308 extern int PQrequestCancel(PGconn *conn); 309 310 /* Accessor functions for PGconn objects */ 311 extern char *PQdb(const PGconn *conn); 312 extern char *PQuser(const PGconn *conn); 313 extern char *PQpass(const PGconn *conn); 314 extern char *PQhost(const PGconn *conn); 315 extern char *PQport(const PGconn *conn); 316 extern char *PQtty(const PGconn *conn); 317 extern char *PQoptions(const PGconn *conn); 318 extern ConnStatusType PQstatus(const PGconn *conn); 319 extern PGTransactionStatusType PQtransactionStatus(const PGconn *conn); 320 extern const char *PQparameterStatus(const PGconn *conn, 321 const char *paramName); 322 extern int PQprotocolVersion(const PGconn *conn); 323 extern int PQserverVersion(const PGconn *conn); 324 extern char *PQerrorMessage(const PGconn *conn); 325 extern int PQsocket(const PGconn *conn); 326 extern int PQbackendPID(const PGconn *conn); 327 extern int PQconnectionNeedsPassword(const PGconn *conn); 328 extern int PQconnectionUsedPassword(const PGconn *conn); 329 extern int PQclientEncoding(const PGconn *conn); 330 extern int PQsetClientEncoding(PGconn *conn, const char *encoding); 331 332 /* SSL information functions */ 333 extern int PQsslInUse(PGconn *conn); 334 extern void *PQsslStruct(PGconn *conn, const char *struct_name); 335 extern const char *PQsslAttribute(PGconn *conn, const char *attribute_name); 336 extern const char *const *PQsslAttributeNames(PGconn *conn); 337 338 /* Get the OpenSSL structure associated with a connection. Returns NULL for 339 * unencrypted connections or if any other TLS library is in use. */ 340 extern void *PQgetssl(PGconn *conn); 341 342 /* Tell libpq whether it needs to initialize OpenSSL */ 343 extern void PQinitSSL(int do_init); 344 345 /* More detailed way to tell libpq whether it needs to initialize OpenSSL */ 346 extern void PQinitOpenSSL(int do_ssl, int do_crypto); 347 348 /* Set verbosity for PQerrorMessage and PQresultErrorMessage */ 349 extern PGVerbosity PQsetErrorVerbosity(PGconn *conn, PGVerbosity verbosity); 350 351 /* Set CONTEXT visibility for PQerrorMessage and PQresultErrorMessage */ 352 extern PGContextVisibility PQsetErrorContextVisibility(PGconn *conn, 353 PGContextVisibility show_context); 354 355 /* Enable/disable tracing */ 356 extern void PQtrace(PGconn *conn, FILE *debug_port); 357 extern void PQuntrace(PGconn *conn); 358 359 /* Override default notice handling routines */ 360 extern PQnoticeReceiver PQsetNoticeReceiver(PGconn *conn, 361 PQnoticeReceiver proc, 362 void *arg); 363 extern PQnoticeProcessor PQsetNoticeProcessor(PGconn *conn, 364 PQnoticeProcessor proc, 365 void *arg); 366 367 /* 368 * Used to set callback that prevents concurrent access to 369 * non-thread safe functions that libpq needs. 370 * The default implementation uses a libpq internal mutex. 371 * Only required for multithreaded apps that use kerberos 372 * both within their app and for postgresql connections. 373 */ 374 typedef void (*pgthreadlock_t) (int acquire); 375 376 extern pgthreadlock_t PQregisterThreadLock(pgthreadlock_t newhandler); 377 378 /* === in fe-exec.c === */ 379 380 /* Simple synchronous query */ 381 extern PGresult *PQexec(PGconn *conn, const char *query); 382 extern PGresult *PQexecParams(PGconn *conn, 383 const char *command, 384 int nParams, 385 const Oid *paramTypes, 386 const char *const *paramValues, 387 const int *paramLengths, 388 const int *paramFormats, 389 int resultFormat); 390 extern PGresult *PQprepare(PGconn *conn, const char *stmtName, 391 const char *query, int nParams, 392 const Oid *paramTypes); 393 extern PGresult *PQexecPrepared(PGconn *conn, 394 const char *stmtName, 395 int nParams, 396 const char *const *paramValues, 397 const int *paramLengths, 398 const int *paramFormats, 399 int resultFormat); 400 401 /* Interface for multiple-result or asynchronous queries */ 402 extern int PQsendQuery(PGconn *conn, const char *query); 403 extern int PQsendQueryParams(PGconn *conn, 404 const char *command, 405 int nParams, 406 const Oid *paramTypes, 407 const char *const *paramValues, 408 const int *paramLengths, 409 const int *paramFormats, 410 int resultFormat); 411 extern int PQsendPrepare(PGconn *conn, const char *stmtName, 412 const char *query, int nParams, 413 const Oid *paramTypes); 414 extern int PQsendQueryPrepared(PGconn *conn, 415 const char *stmtName, 416 int nParams, 417 const char *const *paramValues, 418 const int *paramLengths, 419 const int *paramFormats, 420 int resultFormat); 421 extern int PQsetSingleRowMode(PGconn *conn); 422 extern PGresult *PQgetResult(PGconn *conn); 423 424 /* Routines for managing an asynchronous query */ 425 extern int PQisBusy(PGconn *conn); 426 extern int PQconsumeInput(PGconn *conn); 427 428 /* LISTEN/NOTIFY support */ 429 extern PGnotify *PQnotifies(PGconn *conn); 430 431 /* Routines for copy in/out */ 432 extern int PQputCopyData(PGconn *conn, const char *buffer, int nbytes); 433 extern int PQputCopyEnd(PGconn *conn, const char *errormsg); 434 extern int PQgetCopyData(PGconn *conn, char **buffer, int async); 435 436 /* Deprecated routines for copy in/out */ 437 extern int PQgetline(PGconn *conn, char *string, int length); 438 extern int PQputline(PGconn *conn, const char *string); 439 extern int PQgetlineAsync(PGconn *conn, char *buffer, int bufsize); 440 extern int PQputnbytes(PGconn *conn, const char *buffer, int nbytes); 441 extern int PQendcopy(PGconn *conn); 442 443 /* Set blocking/nonblocking connection to the backend */ 444 extern int PQsetnonblocking(PGconn *conn, int arg); 445 extern int PQisnonblocking(const PGconn *conn); 446 extern int PQisthreadsafe(void); 447 extern PGPing PQping(const char *conninfo); 448 extern PGPing PQpingParams(const char *const *keywords, 449 const char *const *values, int expand_dbname); 450 451 /* Force the write buffer to be written (or at least try) */ 452 extern int PQflush(PGconn *conn); 453 454 /* 455 * "Fast path" interface --- not really recommended for application 456 * use 457 */ 458 extern PGresult *PQfn(PGconn *conn, 459 int fnid, 460 int *result_buf, 461 int *result_len, 462 int result_is_int, 463 const PQArgBlock *args, 464 int nargs); 465 466 /* Accessor functions for PGresult objects */ 467 extern ExecStatusType PQresultStatus(const PGresult *res); 468 extern char *PQresStatus(ExecStatusType status); 469 extern char *PQresultErrorMessage(const PGresult *res); 470 extern char *PQresultVerboseErrorMessage(const PGresult *res, 471 PGVerbosity verbosity, 472 PGContextVisibility show_context); 473 extern char *PQresultErrorField(const PGresult *res, int fieldcode); 474 extern int PQntuples(const PGresult *res); 475 extern int PQnfields(const PGresult *res); 476 extern int PQbinaryTuples(const PGresult *res); 477 extern char *PQfname(const PGresult *res, int field_num); 478 extern int PQfnumber(const PGresult *res, const char *field_name); 479 extern Oid PQftable(const PGresult *res, int field_num); 480 extern int PQftablecol(const PGresult *res, int field_num); 481 extern int PQfformat(const PGresult *res, int field_num); 482 extern Oid PQftype(const PGresult *res, int field_num); 483 extern int PQfsize(const PGresult *res, int field_num); 484 extern int PQfmod(const PGresult *res, int field_num); 485 extern char *PQcmdStatus(PGresult *res); 486 extern char *PQoidStatus(const PGresult *res); /* old and ugly */ 487 extern Oid PQoidValue(const PGresult *res); /* new and improved */ 488 extern char *PQcmdTuples(PGresult *res); 489 extern char *PQgetvalue(const PGresult *res, int tup_num, int field_num); 490 extern int PQgetlength(const PGresult *res, int tup_num, int field_num); 491 extern int PQgetisnull(const PGresult *res, int tup_num, int field_num); 492 extern int PQnparams(const PGresult *res); 493 extern Oid PQparamtype(const PGresult *res, int param_num); 494 495 /* Describe prepared statements and portals */ 496 extern PGresult *PQdescribePrepared(PGconn *conn, const char *stmt); 497 extern PGresult *PQdescribePortal(PGconn *conn, const char *portal); 498 extern int PQsendDescribePrepared(PGconn *conn, const char *stmt); 499 extern int PQsendDescribePortal(PGconn *conn, const char *portal); 500 501 /* Delete a PGresult */ 502 extern void PQclear(PGresult *res); 503 504 /* For freeing other alloc'd results, such as PGnotify structs */ 505 extern void PQfreemem(void *ptr); 506 507 /* Exists for backward compatibility. bjm 2003-03-24 */ 508 #define PQfreeNotify(ptr) PQfreemem(ptr) 509 510 /* Error when no password was given. */ 511 /* Note: depending on this is deprecated; use PQconnectionNeedsPassword(). */ 512 #define PQnoPasswordSupplied "fe_sendauth: no password supplied\n" 513 514 /* Create and manipulate PGresults */ 515 extern PGresult *PQmakeEmptyPGresult(PGconn *conn, ExecStatusType status); 516 extern PGresult *PQcopyResult(const PGresult *src, int flags); 517 extern int PQsetResultAttrs(PGresult *res, int numAttributes, PGresAttDesc *attDescs); 518 extern void *PQresultAlloc(PGresult *res, size_t nBytes); 519 extern int PQsetvalue(PGresult *res, int tup_num, int field_num, char *value, int len); 520 521 /* Quoting strings before inclusion in queries. */ 522 extern size_t PQescapeStringConn(PGconn *conn, 523 char *to, const char *from, size_t length, 524 int *error); 525 extern char *PQescapeLiteral(PGconn *conn, const char *str, size_t len); 526 extern char *PQescapeIdentifier(PGconn *conn, const char *str, size_t len); 527 extern unsigned char *PQescapeByteaConn(PGconn *conn, 528 const unsigned char *from, size_t from_length, 529 size_t *to_length); 530 extern unsigned char *PQunescapeBytea(const unsigned char *strtext, 531 size_t *retbuflen); 532 533 /* These forms are deprecated! */ 534 extern size_t PQescapeString(char *to, const char *from, size_t length); 535 extern unsigned char *PQescapeBytea(const unsigned char *from, size_t from_length, 536 size_t *to_length); 537 538 539 540 /* === in fe-print.c === */ 541 542 extern void PQprint(FILE *fout, /* output stream */ 543 const PGresult *res, 544 const PQprintOpt *ps); /* option structure */ 545 546 /* 547 * really old printing routines 548 */ 549 extern void PQdisplayTuples(const PGresult *res, 550 FILE *fp, /* where to send the output */ 551 int fillAlign, /* pad the fields with spaces */ 552 const char *fieldSep, /* field separator */ 553 int printHeader, /* display headers? */ 554 int quiet); 555 556 extern void PQprintTuples(const PGresult *res, 557 FILE *fout, /* output stream */ 558 int printAttName, /* print attribute names */ 559 int terseOutput, /* delimiter bars */ 560 int width); /* width of column, if 0, use variable width */ 561 562 563 /* === in fe-lobj.c === */ 564 565 /* Large-object access routines */ 566 extern int lo_open(PGconn *conn, Oid lobjId, int mode); 567 extern int lo_close(PGconn *conn, int fd); 568 extern int lo_read(PGconn *conn, int fd, char *buf, size_t len); 569 extern int lo_write(PGconn *conn, int fd, const char *buf, size_t len); 570 extern int lo_lseek(PGconn *conn, int fd, int offset, int whence); 571 extern pg_int64 lo_lseek64(PGconn *conn, int fd, pg_int64 offset, int whence); 572 extern Oid lo_creat(PGconn *conn, int mode); 573 extern Oid lo_create(PGconn *conn, Oid lobjId); 574 extern int lo_tell(PGconn *conn, int fd); 575 extern pg_int64 lo_tell64(PGconn *conn, int fd); 576 extern int lo_truncate(PGconn *conn, int fd, size_t len); 577 extern int lo_truncate64(PGconn *conn, int fd, pg_int64 len); 578 extern int lo_unlink(PGconn *conn, Oid lobjId); 579 extern Oid lo_import(PGconn *conn, const char *filename); 580 extern Oid lo_import_with_oid(PGconn *conn, const char *filename, Oid lobjId); 581 extern int lo_export(PGconn *conn, Oid lobjId, const char *filename); 582 583 /* === in fe-misc.c === */ 584 585 /* Get the version of the libpq library in use */ 586 extern int PQlibVersion(void); 587 588 /* Determine length of multibyte encoded char at *s */ 589 extern int PQmblen(const char *s, int encoding); 590 591 /* Determine display length of multibyte encoded char at *s */ 592 extern int PQdsplen(const char *s, int encoding); 593 594 /* Get encoding id from environment variable PGCLIENTENCODING */ 595 extern int PQenv2encoding(void); 596 597 /* === in fe-auth.c === */ 598 599 extern char *PQencryptPassword(const char *passwd, const char *user); 600 extern char *PQencryptPasswordConn(PGconn *conn, const char *passwd, const char *user, const char *algorithm); 601 602 /* === in encnames.c === */ 603 604 extern int pg_char_to_encoding(const char *name); 605 extern const char *pg_encoding_to_char(int encoding); 606 extern int pg_valid_server_encoding_id(int encoding); 607 608 #ifdef __cplusplus 609 } 610 #endif 611 612 #endif /* LIBPQ_FE_H */ 613