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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/libsnes/bsnes/nall/dl.hpp
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#ifndef NALL_DL_HPP

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#define NALL_DL_HPP

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//dynamic linking support

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#include <nall/intrinsics.hpp>

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#include <nall/stdint.hpp>

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#include <nall/string.hpp>

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#include <nall/utility.hpp>

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#if defined(PLATFORM_X) || defined(PLATFORM_OSX)

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  #include <dlfcn.h>

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#elif defined(PLATFORM_WINDOWS)

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  #include <windows.h>

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  #include <nall/windows/utf8.hpp>

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#endif

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namespace nall {

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  struct library {

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    bool opened() const { return handle; }

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    bool open(const char*, const char* = "");

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    bool open_absolute(const char*);

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    void* sym(const char*);

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    void close();

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    library() : handle(0) {}

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    ~library() { close(); }

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    library& operator=(const library&) = delete;

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    library(const library&) = delete;

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  private:

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    uintptr_t handle;

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  };

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  #if defined(PLATFORM_X)

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  inline bool library::open(const char *name, const char *path) {

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    if(handle) close();

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    handle = (uintptr_t)dlopen(string(path, *path && !strend(path, "/") ? "/" : "", "lib", name, ".so"), RTLD_LAZY);

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    if(!handle) handle = (uintptr_t)dlopen(string("/usr/local/lib/lib", name, ".so"), RTLD_LAZY);

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    return handle;

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  }

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  inline bool library::open_absolute(const char *name) {

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    if(handle) close();

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    handle = (uintptr_t)dlopen(name, RTLD_LAZY);

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    return handle;

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  }

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  inline void* library::sym(const char *name) {

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    if(!handle) return 0;

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    return dlsym((void*)handle, name);

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  }

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  inline void library::close() {

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    if(!handle) return;

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    dlclose((void*)handle);

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    handle = 0;

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  }

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  #elif defined(PLATFORM_OSX)

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  inline bool library::open(const char *name, const char *path) {

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    if(handle) close();

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    handle = (uintptr_t)dlopen(string(path, *path && !strend(path, "/") ? "/" : "", "lib", name, ".dylib"), RTLD_LAZY);

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    if(!handle) handle = (uintptr_t)dlopen(string("/usr/local/lib/lib", name, ".dylib"), RTLD_LAZY);

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    return handle;

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  }

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  inline bool library::open_absolute(const char *name) {

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    if(handle) close();

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    handle = (uintptr_t)dlopen(name, RTLD_LAZY);

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    return handle;

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  }

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  inline void* library::sym(const char *name) {

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    if(!handle) return 0;

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    return dlsym((void*)handle, name);

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  }

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  inline void library::close() {

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    if(!handle) return;

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    dlclose((void*)handle);

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    handle = 0;

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  }

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  #elif defined(PLATFORM_WINDOWS)

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  inline bool library::open(const char *name, const char *path) {

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    if(handle) close();

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    string filepath(path, *path && !strend(path, "/") && !strend(path, "\\") ? "\\" : "", name, ".dll");

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    handle = (uintptr_t)LoadLibraryW(utf16_t(filepath));

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    return handle;

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  }

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  inline bool library::open_absolute(const char *name) {

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    if(handle) close();

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    handle = (uintptr_t)LoadLibraryW(utf16_t(name));

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    return handle;

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  }

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  inline void* library::sym(const char *name) {

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    if(!handle) return 0;

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    return (void*)GetProcAddress((HMODULE)handle, name);

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  }

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  inline void library::close() {

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    if(!handle) return;

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    FreeLibrary((HMODULE)handle);

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    handle = 0;

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  }

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  #else

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  inline bool library::open(const char*, const char*) { return false; }

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  inline void* library::sym(const char*) { return 0; }

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  inline void library::close() {}

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  #endif

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};

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#endif

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