src/loadso/win32/SDL_sysloadso.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library 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 2.1 of the License, or (at your option) any later version.

    This library 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 library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifdef SDL_LOADSO_WIN32

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* System dependent library loading routines                           */

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

#include "SDL_loadso.h"

void *
SDL_LoadObject(const char *sofile)
{
    void *handle = NULL;
    const char *loaderror = "Unknown error";

#if defined(_WIN32_WCE)
    char errbuf[512];

    wchar_t *errbuf_t = SDL_malloc(512 * sizeof(wchar_t));
    wchar_t *sofile_t = SDL_malloc((MAX_PATH + 1) * sizeof(wchar_t));

    MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, sofile, -1, sofile_t,
                        MAX_PATH);
    handle = (void *) LoadLibrary(sofile_t);

    /* Generate an error message if all loads failed */
    if (handle == NULL) {
        FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
                       FORMAT_MESSAGE_FROM_SYSTEM),
                      NULL, GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                      errbuf_t, SDL_arraysize(errbuf), NULL);
        WideCharToMultiByte(CP_ACP, 0, errbuf_t, -1, errbuf, 511, NULL, NULL);
        loaderror = errbuf;
    }

    SDL_free(sofile_t);
    SDL_free(errbuf_t);

#else /*if defined(__WIN32__) */
    char errbuf[512];

    handle = (void *) LoadLibrary(sofile);

    /* Generate an error message if all loads failed */
    if (handle == NULL) {
        FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
                       FORMAT_MESSAGE_FROM_SYSTEM),
                      NULL, GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                      errbuf, SDL_arraysize(errbuf), NULL);
        loaderror = errbuf;
    }
#endif

    if (handle == NULL) {
        SDL_SetError("Failed loading %s: %s", sofile, loaderror);
    }
    return (handle);
}

void *
SDL_LoadFunction(void *handle, const char *name)
{
    void *symbol = NULL;
    const char *loaderror = "Unknown error";

#if defined(_WIN32_WCE)
    char errbuf[512];
    int length = SDL_strlen(name);

    wchar_t *name_t = SDL_malloc((length + 1) * sizeof(wchar_t));
    wchar_t *errbuf_t = SDL_malloc(512 * sizeof(wchar_t));

    MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, name, -1, name_t, length);

    symbol = (void *) GetProcAddress((HMODULE) handle, name_t);
    if (symbol == NULL) {
        FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
                       FORMAT_MESSAGE_FROM_SYSTEM),
                      NULL, GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                      errbuf_t, SDL_arraysize(errbuf), NULL);
        WideCharToMultiByte(CP_ACP, 0, errbuf_t, -1, errbuf, 511, NULL, NULL);
        loaderror = errbuf;
    }

    SDL_free(name_t);
    SDL_free(errbuf_t);

#else /*if defined(WIN32) */
    char errbuf[512];

    symbol = (void *) GetProcAddress((HMODULE) handle, name);
    if (symbol == NULL) {
        FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |
                       FORMAT_MESSAGE_FROM_SYSTEM),
                      NULL, GetLastError(),
                      MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                      errbuf, SDL_arraysize(errbuf), NULL);
        loaderror = errbuf;
    }
#endif

    if (symbol == NULL) {
        SDL_SetError("Failed loading %s: %s", name, loaderror);
    }
    return (symbol);
}

void
SDL_UnloadObject(void *handle)
{
    if (handle != NULL) {
        FreeLibrary((HMODULE) handle);
    }
}

#endif /* SDL_LOADSO_WIN32 */

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