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354 | /* GATE PROJECT LICENSE:
+----------------------------------------------------------------------------+
| Copyright(c) 2018-2025, Stefan Meislinger <sm@opengate.at> |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions are met:|
| |
| 1. Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| 2. Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"|
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| THE POSSIBILITY OF SUCH DAMAGE. |
+----------------------------------------------------------------------------+
*/
#include "gate/libraries.h"
#include "gate/results.h"
#include "gate/platforms.h"
#if defined(GATE_SYS_WIN)
# define GATE_CORE_LIBRARIES_USE_WINAPI 1
#elif defined(GATE_SYS_POSIX)
# define GATE_CORE_LIBRARIES_USE_POSIX 1
#else
# define GATE_CORE_LIBRARIES_NO_IMPL 1
#endif
gate_result_t gate_library_get_function_name(gate_library_t lib, char const* funcname, void* ptrfunc)
{
gate_library_function_t func;
gate_string_t name;
gate_result_t res;
gate_string_create_static(&name, funcname);
res = gate_library_get_function(lib, &name, &func);
if (GATE_SUCCEEDED(res))
{
*((gate_library_function_t*)ptrfunc) = func;
}
else
{
*((gate_library_function_t*)ptrfunc) = NULL;
}
return res;
}
gate_result_t gate_library_get_data_name(gate_library_t lib, char const* entryname, void* ptr_data)
{
void* data;
gate_string_t name;
gate_result_t res;
gate_string_create_static(&name, entryname);
res = gate_library_get_data(lib, &name, &data);
if (GATE_SUCCEEDED(res))
{
*((void**)ptr_data) = data;
}
else
{
*((void**)ptr_data) = NULL;
}
return res;
}
#if defined(GATE_CORE_LIBRARIES_USE_WINAPI)
#ifndef DONT_RESOLVE_DLL_REFERENCES
#define DONT_RESOLVE_DLL_REFERENCES 0x00000001
#endif
static gate_bool_t is_hmodule_valid(HMODULE hmod)
{
#if defined(GATE_SYS_WIN16)
return (hmod > HINSTANCE_ERROR);
#else
return (hmod != NULL);
#endif
}
gate_bool_t gate_library_support()
{
return true;
}
gate_result_t gate_library_open(gate_string_t const* path, gate_library_t* lib, gate_enumint_t flags)
{
gate_result_t ret;
TCHAR libpath[GATE_MAX_FILEPATH_LENGTH];
HMODULE hmod;
DWORD dwflags = 0;
gate_size_t libpathlen = gate_win32_utf8_2_winstr(path->str, path->length, libpath, sizeof(libpath) / sizeof(libpath[0]));
if (libpathlen == 0)
{
return GATE_RESULT_INVALIDDATA;
}
if (GATE_FLAG_ENABLED(flags, GATE_LIBRARY_FLAG_DATA))
{
dwflags |= DONT_RESOLVE_DLL_REFERENCES;
}
hmod = gate_win32_load_library(libpath, dwflags);
if (is_hmodule_valid(hmod))
{
*lib = (gate_library_t)hmod;
ret = GATE_RESULT_OK;
}
else
{
gate_win32_print_lasterror(&ret, NULL, 0);
}
return ret;
}
gate_result_t gate_library_close(gate_library_t lib)
{
gate_result_t ret;
HMODULE hmod = (HMODULE)lib;
BOOL succeeded = true;
#if !defined(GATE_SYS_WIN16)
succeeded =
#endif
FreeLibrary(hmod);
if (succeeded)
{
ret = GATE_RESULT_OK;
}
else
{
gate_win32_print_lasterror(&ret, NULL, 0);
}
return ret;
}
gate_result_t gate_library_get_function(gate_library_t lib, gate_string_t const* entryname, gate_library_function_t* func)
{
gate_result_t ret;
HMODULE hmod = (HMODULE)lib;
gate_size_t procnamelen;
FARPROC proc;
#if defined(GATE_SYS_WINCE)
TCHAR procname[GATE_MAX_FILENAME_LENGTH];
procnamelen = gate_win32_utf8_2_winstr(entryname->str, entryname->length, procname, sizeof(procname) / sizeof(procname[0]));
#else
char procname[GATE_MAX_FILENAME_LENGTH];
procnamelen = gate_str_print_text(procname, sizeof(procname) / sizeof(procname[0]), entryname->str, entryname->length);
#endif
if (procnamelen == 0)
{
return GATE_RESULT_INVALIDDATA;
}
proc = GetProcAddress(hmod, procname);
if (proc == NULL)
{
gate_win32_print_lasterror(&ret, NULL, 0);
}
else
{
*func = (gate_library_function_t)proc;
ret = GATE_RESULT_OK;
}
return ret;
}
gate_result_t gate_library_get_data(gate_library_t lib, gate_string_t const* entryname, void** data)
{
gate_library_function_t ptr;
gate_result_t ret = gate_library_get_function(lib, entryname, &ptr);
if (GATE_SUCCEEDED(ret))
{
*data = (void*)ptr;
}
return ret;
}
#endif /* GATE_CORE_LIBRARIES_USE_WINAPI */
#if defined(GATE_CORE_LIBRARIES_USE_POSIX)
# include "dlfcn.h"
gate_bool_t gate_library_support()
{
static gate_bool_t volatile test_completed = false;
static gate_bool_t volatile test_result = false;
if (!test_completed)
{
void* proc_handle = gate_posix_dlopen(NULL, RTLD_LAZY);
if (NULL == proc_handle)
{
/* dlopen not supported (e.g. in a static binary) */
test_result = false;
}
else
{
test_result = true;
gate_posix_dlclose(proc_handle);
}
test_completed = true;
}
return test_result;
}
gate_result_t gate_library_open(gate_string_t const* path, gate_library_t* lib, gate_enumint_t flags)
{
gate_result_t ret;
void* handle;<--- The scope of the variable 'handle' can be reduced. [+]The scope of the variable 'handle' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:
void f(int x)
{
int i = 0;
if (x) {
// it's safe to move 'int i = 0;' here
for (int n = 0; n < 10; ++n) {
// it is possible but not safe to move 'int i = 0;' here
do_something(&i);
}
}
}
When you see this message it is always safe to reduce the variable scope 1 level.
int dlflags = 0;
char libpath[GATE_MAX_FILEPATH_LENGTH];
gate_size_t libpathlen = gate_str_print_text(libpath, sizeof(libpath) / sizeof(libpath[0]), path->str, path->length);
do
{
if (libpathlen == 0)
{
ret = GATE_RESULT_INVALIDARG;
break;
}
if (GATE_FLAG_ENABLED(flags, GATE_LIBRARY_FLAG_DATA))
{
dlflags |= RTLD_LAZY;
}
else
{
dlflags |= RTLD_NOW;
}
if (GATE_FLAG_ENABLED(flags, GATE_LIBRARY_FLAG_LOCAL))
{
dlflags |= RTLD_LOCAL;
}
else
{
dlflags |= RTLD_GLOBAL;
}
handle = gate_posix_dlopen(libpath, dlflags);
if (handle == NULL)
{
ret = GATE_RESULT_FAILED;
break;
}
/* success: */
*lib = (gate_library_t)handle;
ret = GATE_RESULT_OK;
} while (0);
return ret;
}
gate_result_t gate_library_close(gate_library_t lib)
{
void* handle = (void*)lib;
int errcode = gate_posix_dlclose(handle);
return ((errcode == 0) ? GATE_RESULT_OK : GATE_RESULT_FAILED);
}
gate_result_t gate_library_get_function(gate_library_t lib, gate_string_t const* entryname, gate_library_function_t* func)
{
gate_result_t ret;
void* dataptr;
ret = gate_library_get_data(lib, entryname, &dataptr);
if (GATE_SUCCEEDED(ret) && (func != NULL))
{
*func = (gate_library_function_t)dataptr;
}
return ret;
}
gate_result_t gate_library_get_data(gate_library_t lib, gate_string_t const* entryname, void** data)
{
gate_result_t ret;
void* handle = (void*)lib;
void* dataptr;
char name[GATE_MAX_FILENAME_LENGTH];
gate_size_t entrylen = gate_str_print_text(name, sizeof(name) / sizeof(name[0]), entryname->str, entryname->length);
do
{
if ((handle == NULL) || (entrylen == 0))
{
ret = GATE_RESULT_INVALIDARG;
break;
}
dataptr = gate_posix_dlsym(handle, name);
if (dataptr == NULL)
{
ret = GATE_RESULT_FAILED;
break;
}
/*success case*/
if (data != NULL)
{
*data = dataptr;
}
ret = GATE_RESULT_OK;
} while (0);
return ret;
}
#endif /* GATE_SYS_POSIX */
#if defined(GATE_CORE_LIBRARIES_NO_IMPL)
gate_bool_t gate_library_support()
{
return false;
}
gate_result_t gate_library_open(gate_string_t const* path, gate_library_t* lib, gate_enumint_t flags)
{
(void)path;
(void)lib;
(void)flags;
return GATE_RESULT_NOTSUPPORTED;
}
gate_result_t gate_library_close(gate_library_t lib)
{
(void)lib;
return GATE_RESULT_NOTSUPPORTED;
}
gate_result_t gate_library_get_function(gate_library_t lib, gate_string_t const* entryname, gate_library_function_t* ptr_func)
{
(void)lib;
(void)entryname;
(void)ptr_func;
return GATE_RESULT_NOTSUPPORTED;
}
gate_result_t gate_library_get_data(gate_library_t lib, gate_string_t const* entryname, void** ptr_data)
{
(void)lib;
(void)entryname;
(void)ptr_data;
return GATE_RESULT_NOTSUPPORTED;
}
#endif /* GATE_CORE_LIBRARIES_NO_IMPL */
|