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https://github.com/postgres/postgres.git
synced 2025-07-23 03:21:12 +03:00
As proposed,
following is the patch to libpq's large object interface that
removes the requirement to include fmgr.h into fe-lobj.c.
The large object interface now ask's the backend to tell the
OID's of all the required functions in pg_proc.
From: wieck@sapserv.debis.de (Jan Wieck)
This commit is contained in:
Marc G. Fournier
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-lobj.c,v 1.3 1996/11/08 06:02:28 momjian Exp $
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* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-lobj.c,v 1.4 1996/11/11 12:16:56 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -18,7 +18,6 @@
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#include <sys/types.h>
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#include "postgres.h"
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#include "libpq-fe.h"
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#include "fmgr.h"
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#include "libpq/libpq-fs.h"
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#ifndef MAXPATHLEN
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@ -27,6 +26,8 @@
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#define LO_BUFSIZE 1024
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static int lo_initialize(PGconn *conn);
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/*
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* lo_open
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* opens an existing large object
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@ -49,8 +50,14 @@ lo_open(PGconn* conn, Oid lobjId, int mode)
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argv[1].isint = 1;
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argv[1].len = 4;
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argv[1].u.integer = mode;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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res = PQfn(conn, F_LO_OPEN,&fd,&result_len,1,argv,2);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_open,&fd,&result_len,1,argv,2);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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@ -78,10 +85,17 @@ lo_close(PGconn *conn, int fd)
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int retval;
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int result_len;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = fd;
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res = PQfn(conn, F_LO_CLOSE,&retval,&result_len,1,argv,1);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_close,
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&retval,&result_len,1,argv,1);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return retval;
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@ -104,6 +118,12 @@ lo_read(PGconn *conn, int fd, char *buf, int len)
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PGresult *res;
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int result_len;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = fd;
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@ -112,7 +132,8 @@ lo_read(PGconn *conn, int fd, char *buf, int len)
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argv[1].len = 4;
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argv[1].u.integer = len;
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res = PQfn(conn, F_LOREAD,(int*)buf,&result_len,0,argv,2);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_read,
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(int*)buf,&result_len,0,argv,2);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return result_len;
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@ -133,6 +154,12 @@ lo_write(PGconn *conn, int fd, char *buf, int len)
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int result_len;
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int retval;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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if (len <= 0)
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return 0;
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@ -144,7 +171,8 @@ lo_write(PGconn *conn, int fd, char *buf, int len)
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argv[1].len = len;
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argv[1].u.ptr = (int*)buf;
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res = PQfn(conn, F_LOWRITE,&retval,&result_len,1,argv,2);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_write,
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&retval,&result_len,1,argv,2);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return retval;
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@ -167,6 +195,12 @@ lo_lseek(PGconn *conn, int fd, int offset, int whence)
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int retval;
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int result_len;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = fd;
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@ -179,7 +213,8 @@ lo_lseek(PGconn *conn, int fd, int offset, int whence)
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argv[2].len = 4;
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argv[2].u.integer = whence;
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res = PQfn(conn, F_LO_LSEEK,&retval,&result_len,1,argv,3);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_lseek,
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&retval,&result_len,1,argv,3);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return retval;
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@ -204,10 +239,17 @@ lo_creat(PGconn *conn, int mode)
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int retval;
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int result_len;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = mode;
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res = PQfn(conn, F_LO_CREAT,&retval,&result_len,1,argv,1);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_creat,
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&retval,&result_len,1,argv,1);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return (Oid)retval;
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@ -230,11 +272,18 @@ lo_tell(PGconn *conn, int fd)
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PGresult *res;
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int result_len;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = fd;
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res = PQfn(conn, F_LO_TELL,&retval,&result_len,1,argv,1);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_tell,
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&retval,&result_len,1,argv,1);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return retval;
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@ -256,11 +305,18 @@ lo_unlink(PGconn *conn, Oid lobjId)
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int result_len;
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int retval;
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if(conn->lobjfuncs == (PGlobjfuncs *)NULL) {
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if(lo_initialize(conn) < 0) {
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return -1;
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}
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}
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argv[0].isint = 1;
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argv[0].len = 4;
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argv[0].u.integer = lobjId;
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res = PQfn(conn, F_LO_UNLINK,&retval,&result_len,1,argv,1);
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res = PQfn(conn, conn->lobjfuncs->fn_lo_unlink,
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&retval,&result_len,1,argv,1);
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if (PQresultStatus(res) == PGRES_COMMAND_OK) {
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PQclear(res);
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return retval;
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@ -380,3 +436,157 @@ lo_export(PGconn *conn, Oid lobjId, char *filename)
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return 1;
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}
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/* ----------------
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* lo_initialize
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*
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* Initialize the large object interface for an existing connection.
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* We ask the backend about the functions OID's in pg_proc for all
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* functions that are required for large object operations.
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* ----------------
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*/
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static int lo_initialize(PGconn *conn)
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{
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PGresult *res;
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PGlobjfuncs *lobjfuncs;
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int n;
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char *fname;
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Oid foid;
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/* ----------------
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* Allocate the structure to hold the functions OID's
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* ----------------
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*/
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lobjfuncs = (PGlobjfuncs *)malloc(sizeof(PGlobjfuncs));
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if (lobjfuncs == (PGlobjfuncs *)NULL) {
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strcpy(conn->errorMessage,
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"FATAL: malloc() failed in lo_initialize()\n");
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return -1;
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}
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memset((char *)lobjfuncs, 0, sizeof(PGlobjfuncs));
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/* ----------------
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* Execute the query to get all the functions at once
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* ----------------
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*/
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res = PQexec(conn, "select proname, oid from pg_proc \
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where proname = 'lo_open' \
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or proname = 'lo_close' \
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or proname = 'lo_creat' \
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or proname = 'lo_unlink' \
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or proname = 'lo_lseek' \
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or proname = 'lo_tell' \
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or proname = 'LOread' \
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or proname = 'LOwrite'");
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if (res == (PGresult *)NULL) {
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free(lobjfuncs);
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return -1;
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}
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if (res->resultStatus != PGRES_TUPLES_OK) {
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free(lobjfuncs);
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PQclear(res);
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strcpy(conn->errorMessage,
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"ERROR: SELECT didn't return data in lo_initialize()\n");
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return -1;
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}
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/* ----------------
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* Examine the result and put the OID's into the struct
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* ----------------
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*/
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for(n = 0; n < PQntuples(res); n++) {
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fname = PQgetvalue(res, n, 0);
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foid = (Oid)atoi(PQgetvalue(res, n, 1));
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if(!strcmp(fname, "lo_open")) {
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lobjfuncs->fn_lo_open = foid;
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} else
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if(!strcmp(fname, "lo_close")) {
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lobjfuncs->fn_lo_close = foid;
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} else
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if(!strcmp(fname, "lo_creat")) {
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lobjfuncs->fn_lo_creat = foid;
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} else
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if(!strcmp(fname, "lo_unlink")) {
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lobjfuncs->fn_lo_unlink = foid;
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} else
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if(!strcmp(fname, "lo_lseek")) {
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lobjfuncs->fn_lo_lseek = foid;
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} else
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if(!strcmp(fname, "lo_tell")) {
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lobjfuncs->fn_lo_tell = foid;
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} else
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if(!strcmp(fname, "LOread")) {
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lobjfuncs->fn_lo_read = foid;
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} else
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if(!strcmp(fname, "LOwrite")) {
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lobjfuncs->fn_lo_write = foid;
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}
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}
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PQclear(res);
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/* ----------------
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* Finally check that we really got all large object
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* interface functions.
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* ----------------
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*/
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if(lobjfuncs->fn_lo_open == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_open\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_close == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_close\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_creat == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_creat\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_unlink == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_unlink\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_lseek == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_lseek\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_tell == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function lo_tell\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_read == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function LOread\n");
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free(lobjfuncs);
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return -1;
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}
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if(lobjfuncs->fn_lo_write == 0) {
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strcpy(conn->errorMessage,
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"ERROR: Cannot determine OID for function LOwrite\n");
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free(lobjfuncs);
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return -1;
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}
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/* ----------------
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* Put the structure into the connection control
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* ----------------
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*/
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conn->lobjfuncs = lobjfuncs;
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return 0;
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}
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