171 lines
4.2 KiB
C
171 lines
4.2 KiB
C
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/*
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* pqStubInit.c --
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*
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* Stubs tables for the foreign PostgreSQL libraries so that
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* Tcl extensions can use them without the linker's knowing about them.
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*
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* @CREATED@ 2015-06-26 12:55:15Z by genExtStubs.tcl from ../generic/pqStubDefs.txt
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*
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* Copyright (c) 2010 by Kevin B. Kenny.
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*
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* Please refer to the file, 'license.terms' for the conditions on
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* redistribution of this file and for a DISCLAIMER OF ALL WARRANTIES.
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*
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*-----------------------------------------------------------------------------
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*/
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#include <tcl.h>
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#endif
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#include "fakepq.h"
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/*
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* Static data used in this file
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*/
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/*
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* Names of the libraries that might contain the PostgreSQL API
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*/
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#if defined(__CYGWIN__) && !defined(LIBPREFIX)
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# define LIBPREFIX "cyg"
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#else
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# define LIBPREFIX "lib"
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#endif
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static const char *const pqStubLibNames[] = {
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/* @LIBNAMES@: DO NOT EDIT THESE NAMES */
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"pq", NULL
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/* @END@ */
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};
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/* ABI Version numbers of the PostgreSQL API that we can cope with */
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static const char pqSuffixes[][4] = {
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"", ".5"
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};
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/* Names of the functions that we need from PostgreSQL */
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static const char *const pqSymbolNames[] = {
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/* @SYMNAMES@: DO NOT EDIT THESE NAMES */
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"pg_encoding_to_char",
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"PQclear",
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"PQclientEncoding",
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"PQcmdTuples",
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"PQconnectdb",
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"PQerrorMessage",
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"PQdescribePrepared",
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"PQexec",
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"PQexecPrepared",
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"PQdb",
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"PQfinish",
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"PQfname",
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"PQfnumber",
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"PQftype",
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"PQgetisnull",
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"PQgetlength",
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"PQgetvalue",
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"PQhost",
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"PQnfields",
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"PQnparams",
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"PQntuples",
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"PQoptions",
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"PQparamtype",
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"PQpass",
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"PQport",
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"PQprepare",
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"PQresultErrorField",
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"PQresultStatus",
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"PQsetClientEncoding",
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"PQsetNoticeProcessor",
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"PQstatus",
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"PQuser",
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"PQtty",
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NULL
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/* @END@ */
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};
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/*
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* Table containing pointers to the functions named above.
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*/
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static pqStubDefs pqStubsTable;
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const pqStubDefs* pqStubs = &pqStubsTable;
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/*
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*-----------------------------------------------------------------------------
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*
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* PQInitStubs --
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*
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* Initialize the Stubs table for the PostgreSQL API
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*
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* Results:
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* Returns the handle to the loaded PostgreSQL client library, or NULL
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* if the load is unsuccessful. Leaves an error message in the
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* interpreter.
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*
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*-----------------------------------------------------------------------------
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*/
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MODULE_SCOPE Tcl_LoadHandle
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PostgresqlInitStubs(Tcl_Interp* interp)
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{
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int i;
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size_t j;
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int status; /* Status of Tcl library calls */
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Tcl_Obj* path; /* Path name of a module to be loaded */
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Tcl_Obj* shlibext; /* Extension to use for load modules */
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Tcl_LoadHandle handle = NULL;
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/* Handle to a load module */
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/* Determine the shared library extension */
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status = Tcl_EvalEx(interp, "::info sharedlibextension", -1,
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TCL_EVAL_GLOBAL);
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if (status != TCL_OK) return NULL;
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shlibext = Tcl_GetObjResult(interp);
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Tcl_IncrRefCount(shlibext);
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/* Walk the list of possible library names to find an PostgreSQL client */
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status = TCL_ERROR;
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for (i = 0; status == TCL_ERROR && pqStubLibNames[i] != NULL; ++i) {
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for (j = 0; status == TCL_ERROR && (j < sizeof(pqSuffixes)/sizeof(pqSuffixes[0])); ++j) {
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path = Tcl_NewStringObj(LIBPREFIX, -1);
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Tcl_AppendToObj(path, pqStubLibNames[i], -1);
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#ifdef __CYGWIN__
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if (*pqSuffixes[j]) {
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Tcl_AppendToObj(path, "-", -1);
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Tcl_AppendToObj(path, pqSuffixes[j]+1, -1);
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}
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#endif
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Tcl_AppendObjToObj(path, shlibext);
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#ifndef __CYGWIN__
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Tcl_AppendToObj(path, pqSuffixes[j], -1);
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#endif
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Tcl_IncrRefCount(path);
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/* Try to load a client library and resolve symbols within it. */
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Tcl_ResetResult(interp);
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status = Tcl_LoadFile(interp, path, pqSymbolNames, 0,
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&pqStubsTable, &handle);
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Tcl_DecrRefCount(path);
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}
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}
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/*
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* Either we've successfully loaded a library (status == TCL_OK),
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* or we've run out of library names (in which case status==TCL_ERROR
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* and the error message reflects the last unsuccessful load attempt).
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*/
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Tcl_DecrRefCount(shlibext);
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if (status != TCL_OK) {
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return NULL;
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}
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return handle;
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}
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