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/*
Copyright (C) 2008 Andreas Baumann <abaumann@yahoo.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "library/loader.h"
#include <stdlib.h> /* for EXIT_SUCCESS, EXIT_FAILURE */
#include <stdio.h> /* for fprintf */
#include <assert.h> /* for assert */
#ifdef _WIN32
#define LIBRARY_NAME "testlib.dll"
#else
#define LIBRARY_NAME "./testlib.so.0.0.0"
#endif
#define LIBRARY_FUNC "multiply_by_two"
#define LIBRARY_VAR "seven"
#define LIBRARY_STRUCT "mod_descr"
typedef int (*multiply_by_two_func)( int );
typedef struct {
int major;
int minor;
multiply_by_two_func func;
} module_descriptor_t;
int main( void ) {
wolf_library_p library;
wolf_error_t error;
char errbuf[512];
WOLF_LIBRARY_FUNCPTR symbol;
multiply_by_two_func func;
int res = 0;
int *var;
module_descriptor_t *mod_descr;
/* open the libray */
library = wolf_library_load( LIBRARY_NAME, &error );
if( error != WOLF_OK ) {
fprintf( stderr, "Error %d (%s) loading library '%s':\n",
error, wolf_error_msg( error, errbuf, 512 ), LIBRARY_NAME );
fprintf( stderr, "Internal loader error: %s\n",
wolf_library_error_msg( library, errbuf, 512 ) );
(void)wolf_library_unload( library );
return EXIT_FAILURE;
}
/* fetch a known function symbol (multiply_by_two) */
symbol = wolf_library_get( library, LIBRARY_FUNC, &error );
if( error != WOLF_OK ) {
fprintf( stderr, "Error %d (%s) fetching function '%s' from the library\n",
error, wolf_error_msg( error, errbuf, 512 ), LIBRARY_FUNC );
fprintf( stderr, "Internal loader error: %s\n",
wolf_library_error_msg( library, errbuf, 512 ) );
(void)wolf_library_unload( library );
return EXIT_FAILURE;
}
WOLF_LIBRARY_FUNC_CAST( symbol, multiply_by_two_func, func );
/* call it */
res = func( 7 );
printf( "func(7) = %d\n", res );
assert( res == 14 );
/* fetch address as address to a variable (seven) */
var = (int *)wolf_library_get( library, LIBRARY_VAR, &error );
if( error != WOLF_OK ) {
fprintf( stderr, "Error %d (%s) fetching variable '%s' from the library\n",
error, wolf_error_msg( error, errbuf, 512 ), LIBRARY_VAR );
fprintf( stderr, "Internal loader error: %s\n",
wolf_library_error_msg( library, errbuf, 512 ) );
(void)wolf_library_unload( library );
return EXIT_FAILURE;
}
printf( "var = %d\n", *var );
assert( *var == 7 );
/* fetch something complex (in this case something like a module descriptor) */
mod_descr = (module_descriptor_t *)wolf_library_get( library, LIBRARY_STRUCT, &error );
if( error != WOLF_OK ) {
fprintf( stderr, "Error %d (%s) fetching structure '%s' from the library\n",
error, wolf_error_msg( error, errbuf, 512 ), LIBRARY_STRUCT );
fprintf( stderr, "Internal loader error: %s\n",
wolf_library_error_msg( library, errbuf, 512 ) );
(void)wolf_library_unload( library );
return EXIT_FAILURE;
}
printf( "module version: %d.%d\n", mod_descr->major, mod_descr->minor );
assert( mod_descr->major == 1 && mod_descr->minor == 0 );
/* close library */
error = wolf_library_unload( library );
if( error != WOLF_OK ) {
fprintf( stderr, "Error %d (%s) unloading the library\n",
error, wolf_error_msg( error, errbuf, 512 ) );
fprintf( stderr, "Internal loader error: %s\n",
wolf_library_error_msg( library, errbuf, 512 ) );
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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