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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"
#define dlsym_and_check(dest, name) \
dest->name = dlsym(dest->dl_handle, #name); \
if ((!dest->name) || (dest->name == dest->dl_handle)) { \
char *msg = dlerror(); \
fprintf(stderr, "calculer: %s\n", msg); \
dlclose(dest->dl_handle); \
free(dest); \
return -1; \
}
static int
load_symbols(struct disp *disp)
{
void *handle = dlopen(disp->so_path, RTLD_LAZY);
if (!handle)
{
fprintf(stderr, "calculer: %s\n", dlerror());
exit(1);
}
#ifndef NDEBUG
printf("INFO: successfully loaded symbols from \"%s\"\n", disp->so_path);
#endif
disp->dl_handle = handle;
dlsym_and_check(disp, init);
dlsym_and_check(disp, display_calc);
dlsym_and_check(disp, read_input);
dlsym_and_check(disp, display_res);
dlsym_and_check(disp, destroy);
#ifndef NDEBUG
dlsym_and_check(disp, pre_reload);
dlsym_and_check(disp, post_reload);
#endif
return 0;
}
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);
return load_symbols(disp) == 0 ? disp : NULL;
#else
# error "not available yet"
#endif
return NULL;
}
void
destroy_disp(struct disp *disp)
{
disp->destroy();
dlclose(disp->dl_handle);
free(disp->so_path);
free(disp);
}
#ifndef NDEBUG
void
disp_reload(struct disp *disp)
{
int status;
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");
status = load_symbols(disp);
if (status == -1)
{
printf("calculer: %s\n", dlerror());
exit(1);
}
printf("INFO: loading state\n");
disp->post_reload(state);
printf("INFO: reloading done\n");
}
#endif
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