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/*
* Copyright (C) 2024 Tristan Riehs
*
* 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 "config.h"
#include <dlfcn.h>
#include <limits.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "disp.h"
static void *
load_generic_symbol(struct disp *disp, char *base_name)
{
char full_name[64] = {0};
void *ptr;
strcpy(full_name, disp->name);
strcat(full_name, "_");
strcat(full_name, base_name);
ptr = dlsym(disp->dl_handle, full_name);
if (!ptr)
{
fprintf(stderr, "calculer: %s\n", dlerror());
destroy_disp(disp);
exit(1);
}
return ptr;
}
static void
load_symbols(struct disp *disp)
{
void *handle = dlopen(disp->so_path, RTLD_LAZY);
if (!handle)
{
fprintf(stderr, "calculer: %s\n", dlerror());
destroy_disp(disp);
exit(1);
}
disp->dl_handle = handle;
disp->init = load_generic_symbol(disp, "init");
disp->display_calc = load_generic_symbol(disp, "display_calc");
disp->read_input = load_generic_symbol(disp, "read_input");
disp->display_res = load_generic_symbol(disp, "display_res");
disp->destroy = load_generic_symbol(disp, "destroy");
disp->pre_reload = load_generic_symbol(disp, "pre_reload");
disp->post_reload = load_generic_symbol(disp, "post_reload");
printf("INFO: successfully loaded symbols from \"%s\"\n",
disp->so_path);
}
struct disp *
get_disp(char *disp_name)
{
#ifndef NDEBUG
/* displays are shared libraries */
char so_path[64] = {0};
strcpy(so_path, "./src/.libs/");
strcat(so_path, disp_name);
strcat(so_path, ".so.0.0.0");
struct disp *disp = malloc(sizeof(*disp));
disp->so_path = strdup(so_path);
disp->name = disp_name;
load_symbols(disp);
return disp;
#else
# error "not available yet"
#endif
return NULL;
}
void
destroy_disp(struct disp *disp)
{
if (disp->destroy)
disp->destroy();
if (disp->dl_handle)
dlclose(disp->dl_handle);
free(disp->so_path);
free(disp);
}
#ifndef NDEBUG
void
disp_reload(struct disp *disp)
{
printf("INFO: saving state\n");
void *state = disp->pre_reload();
printf("INFO: closing shared library\n");
dlclose(disp->dl_handle);
printf("INFO: reloading symbols\n");
load_symbols(disp);
printf("INFO: loading state\n");
disp->post_reload(state);
printf("INFO: reloading done\n");
}
#endif
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