fastfetch/src/common/library.h

#pragma once

#include "fastfetch.h"
#include "common/FFcheckmacros.h"

#ifndef FF_DISABLE_DLOPEN

#    if defined(_WIN32)
#        define FF_DLOPEN_FLAGS 0
FF_C_NODISCARD void* dlopen(const char* path, int mode);
FF_C_NODISCARD void* dlsym(void* handle, const char* symbol);
int dlclose(void* handle);
#    else
#        include <dlfcn.h>
#    endif

#    ifdef _WIN32
#        define FF_LIBRARY_EXTENSION ".dll"
#    elif defined(__APPLE__)
#        define FF_LIBRARY_EXTENSION ".dylib"
#    else
#        define FF_LIBRARY_EXTENSION ".so"
#    endif

static inline void ffLibraryUnload(void** handle) {
    assert(handle);
    if (*handle) {
        dlclose(*handle);
    }
}

#    if __cplusplus
#        define __auto_type auto
#    endif

#    define FF_LIBRARY_SYMBOL(symbolName) \
        __typeof__(&symbolName) ff##symbolName;

#    define FF_LIBRARY_LOAD(libraryObjectName, returnValue, ...)                                                  \
        void* __attribute__((__cleanup__(ffLibraryUnload))) libraryObjectName = ffLibraryLoad(__VA_ARGS__, NULL); \
        if (libraryObjectName == NULL)                                                                            \
            return returnValue;

#    define FF_LIBRARY_LOAD_MESSAGE(libraryObjectName, libraryFileName, maxVersion, ...) \
        FF_LIBRARY_LOAD(libraryObjectName, "dlopen(" libraryFileName ") failed", libraryFileName, maxVersion, ##__VA_ARGS__)

#    define FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, symbolMapping, symbolName, returnValue) \
        symbolMapping = (__typeof__(&symbolName)) dlsym(library, #symbolName);              \
        if (symbolMapping == NULL)                                                          \
            return returnValue;

#    define FF_LIBRARY_LOAD_SYMBOL(library, symbolName, returnValue) \
        __auto_type FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, ff##symbolName, symbolName, returnValue);

#    define FF_LIBRARY_LOAD_SYMBOL_LAZY(library, symbolName) \
        __auto_type ff##symbolName = (__typeof__(&symbolName)) dlsym(library, #symbolName);

#    define FF_LIBRARY_LOAD_SYMBOL_MESSAGE(library, symbolName) \
        __auto_type FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, ff##symbolName, symbolName, "dlsym " #symbolName " failed");

#    define FF_LIBRARY_LOAD_SYMBOL_VAR(library, varName, symbolName, returnValue) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName).ff##symbolName, symbolName, returnValue);

#    define FF_LIBRARY_LOAD_SYMBOL_VAR_MESSAGE(library, varName, symbolName) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName).ff##symbolName, symbolName, "dlsym " #symbolName " failed");

#    define FF_LIBRARY_LOAD_SYMBOL_PTR(library, varName, symbolName, returnValue) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName)->ff##symbolName, symbolName, returnValue);

void* ffLibraryLoad(const char* path, int maxVersion, ...);

#else

#    define FF_LIBRARY_EXTENSION ""

#    define FF_LIBRARY_SYMBOL(symbolName) \
        __typeof__(&symbolName) ff##symbolName;

#    define FF_LIBRARY_LOAD(libraryObjectName, returnValue, ...) \
        FF_MAYBE_UNUSED void* libraryObjectName = NULL; // Placeholder

#    define FF_LIBRARY_LOAD_MESSAGE(libraryObjectName, libraryFileName, maxVersion, ...) \
        FF_LIBRARY_LOAD(libraryObjectName, , libraryFileName, maxVersion, ##__VA_ARGS__)

#    define FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, symbolMapping, symbolName, returnValue) \
        symbolMapping = (__typeof__(&symbolName)) &symbolName;

#    define FF_LIBRARY_LOAD_SYMBOL(library, symbolName, returnValue) \
        FF_MAYBE_UNUSED __auto_type FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, ff##symbolName, symbolName, returnValue);

#    define FF_LIBRARY_LOAD_SYMBOL_LAZY(library, symbolName) \
        FF_MAYBE_UNUSED __auto_type ff##symbolName = (__typeof__(&symbolName)) &symbolName;

#    define FF_LIBRARY_LOAD_SYMBOL_MESSAGE(library, symbolName) \
        FF_MAYBE_UNUSED __auto_type FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, ff##symbolName, symbolName, "dlsym " #symbolName " failed");

#    define FF_LIBRARY_LOAD_SYMBOL_VAR(library, varName, symbolName, returnValue) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName).ff##symbolName, symbolName, returnValue);

#    define FF_LIBRARY_LOAD_SYMBOL_VAR_MESSAGE(library, varName, symbolName) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName).ff##symbolName, symbolName, "dlsym " #symbolName " failed");

#    define FF_LIBRARY_LOAD_SYMBOL_PTR(library, varName, symbolName, returnValue) \
        FF_LIBRARY_LOAD_SYMBOL_ADDRESS(library, (varName)->ff##symbolName, symbolName, returnValue);

#endif

#if _WIN32
void* ffLibraryGetModule(const wchar_t* libraryFileName);
#endif