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/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (dylib.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include <dynamic/dylib.h>
#ifdef NEED_DYNAMIC
#ifdef _WIN32
#include <compat/posix_string.h>
#include <windows.h>
#else
#include <dlfcn.h>
#endif
#ifdef _WIN32
static char last_dyn_error[512];
static void set_dl_error(void)
{
DWORD err = GetLastError();
if (FormatMessage(FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
err,
MAKELANGID(LANG_ENGLISH, SUBLANG_DEFAULT),
last_dyn_error,
sizeof(last_dyn_error) - 1,
NULL) == 0)
snprintf(last_dyn_error, sizeof(last_dyn_error) - 1,
"unknown error %lu", err);
}
#endif
/**
* dylib_load:
* @path : Path to libretro core library.
*
* Platform independent dylib loading.
*
* Returns: library handle on success, otherwise NULL.
**/
dylib_t dylib_load(const char *path)
{
#ifdef _WIN32
int prevmode = SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOOPENFILEERRORBOX);
dylib_t lib = LoadLibrary(path);
SetErrorMode(prevmode);
if (!lib)
{
set_dl_error();
return NULL;
}
last_dyn_error[0] = 0;
#else
dylib_t lib = dlopen(path, RTLD_LAZY);
#endif
return lib;
}
char *dylib_error(void)
{
#ifdef _WIN32
if (last_dyn_error[0])
return last_dyn_error;
return NULL;
#else
return (char*)dlerror();
#endif
}
function_t dylib_proc(dylib_t lib, const char *proc)
{
function_t sym;
#ifdef _WIN32
sym = (function_t)GetProcAddress(lib ?
(HMODULE)lib : GetModuleHandle(NULL), proc);
if (!sym)
{
set_dl_error();
return NULL;
}
last_dyn_error[0] = 0;
#else
void *ptr_sym = NULL;
if (lib)
ptr_sym = dlsym(lib, proc);
else
{
void *handle = dlopen(NULL, RTLD_LAZY);
if (handle)
{
ptr_sym = dlsym(handle, proc);
dlclose(handle);
}
}
/* Dirty hack to workaround the non-legality of
* (void*) -> fn-pointer casts. */
memcpy(&sym, &ptr_sym, sizeof(void*));
#endif
return sym;
}
/**
* dylib_close:
* @lib : Library handle.
*
* Frees library handle.
**/
void dylib_close(dylib_t lib)
{
#ifdef _WIN32
if (!FreeLibrary((HMODULE)lib))
set_dl_error();
last_dyn_error[0] = 0;
#else
#ifndef NO_DLCLOSE
dlclose(lib);
#endif
#endif
}
#endif
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