source: trunk/src/emx/src/libdl/dlerror.c@ 234

/* $Id: dlerror.c 234 2003-05-26 09:28:55Z bird $ */
/** @file
 * dlclose - Close an dlopen'ed dynamic load library.
 *
 * Copyright (c) 2001-2003 knut st. osmundsen <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with This program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#define INCL_BASE
#include <os2.h>

#include <stdio.h>
#include <string.h>
#include <dlfcn.h>

#include "dlfcn_private.h"


/**
 * Returns the last error.
 * The last error is reset by this call.
 * @returns NULL if not error since last dlerror call.
 *          Error description string.
 */
const char *dlerror(void)
{
    if (dlfcn_ulLastError != NO_ERROR)
    {
        const char *pszOp = NULL;
        char szTmpBuffer[DLFCN_MAX_ERROR_OBJ];

        switch (dlfcn_enmLastOp)
        {
            case dlfcn_dlopen:  pszOp = "dlopen"; break;
            case dlfcn_dlclose: pszOp = "dlclose"; break;
            case dlfcn_dlsym:   pszOp = "dlerror"; break;
            default:            pszOp = "!internal error!"; break;
        }

        szTmpBuffer[0] = '\0';
        if (dlfcn_enmLastOp == dlfcn_dlopen || dlfcn_enmLastOp == dlfcn_dlclose)
            strncat(&szTmpBuffer[0], &dlfcn_szLastError[0], sizeof(szTmpBuffer));

        if (szTmpBuffer[0] != '\0')
            sprintf(&dlfcn_szLastError[0], "%s rc=%lu extra=%s", pszOp, dlfcn_ulLastError, &szTmpBuffer[0]);
        else
            sprintf(&dlfcn_szLastError[0], "%s rc=%lu", pszOp, dlfcn_ulLastError);

        dlfcn_ulLastError = NO_ERROR;
        dlfcn_enmLastOp   = dlfcn_dlerror;
        return &dlfcn_szLastError[0];
    }

    dlfcn_enmLastOp   = dlfcn_dlerror;
    return NULL;
}