/*

 Package: dyncall
 Library: dynload
 File: dynload/dynload_darwin.c
 Description: dynload module for .dylib (mach-o darwin/OS X) files
 License:

   Copyright (c) 2007-2015 Olivier Chafik <olivier.chafik@gmail.com>
                           Minor bug-fix modifications by Daniel Adler.

   Permission to use, copy, modify, and distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/



/*

  dynload_darwin.c

  dynload module for .dylib (mach-o darwin/OS X) files

*/


#include "dynload.h"
#include "dynload_alloc.h"
#include <dlfcn.h>
#include <string.h>

struct DLLib_
{
	char* libPath;
	void* handle;
};


DLLib* dlLoadLibrary(const char* libPath)
{
	void* handle;
	size_t len;
	DLLib* lib;
	
	handle = dlopen(libPath, RTLD_LAZY);
	if (!handle)
		return NULL;

      
        lib = (DLLib*)dlAllocMem(sizeof(DLLib));
        lib->handle = handle;
        /* libPath might be null (self reference on image) [Daniel] */
        if (libPath != NULL) {
                len = strlen(libPath);
                lib->libPath = (char*)dlAllocMem(len + 1);
                strcpy(lib->libPath, libPath);
                lib->libPath[len] = '\0';
        } else {
                lib->libPath = NULL;
        }
        return lib;
}

void* dlFindSymbol(DLLib* libHandle, const char* symbol)
{
  return dlsym(libHandle && libHandle->handle ? libHandle->handle : RTLD_DEFAULT, symbol);
}


void  dlFreeLibrary(DLLib* libHandle)
{
	if (!libHandle)
		return;
	
	dlclose(libHandle->handle);
        if (libHandle->libPath)
	        dlFreeMem(libHandle->libPath);
	dlFreeMem(libHandle);
}