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#define _DEFAULT_SOURCE
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include "app.h"
//
// PlatformAPI Implementation.
//
size_t
platform_read_file(const char *path, char *memory) {
size_t file_size = 0;
FILE *fp = fopen(path, "rb");
if (!fp) {
return 0;
}
fseek(fp, 0, SEEK_END);
file_size = ftell(fp);
rewind(fp);
fread(memory, 1, file_size, fp);
fclose(fp);
memory[file_size] = '\0';
return file_size;
}
void
platform_log(const char *format, ...) {
// Print date.
time_t raw_time = time(NULL);
struct tm *tm = localtime(&raw_time);
char date[64];
strftime(date, sizeof(date), "%Y-%M-%d | %H:%M:%S", tm);
printf("%s | ", date);
// Print message.
va_list args;
va_start(args, format);
vprintf(format, args);
printf("\n");
va_end(args);
}
void
platform_sleep(size_t microseconds) {
usleep(microseconds);
}
#if defined(LIB_NAME) && defined(LIB_DIR)
//
// Dynamic linking with hot code reload.
//
#include <dlfcn.h>
#include <sys/stat.h>
#include <sys/types.h>
static ino_t lib_id;
static void * lib_handle;
static const char *lib_path = LIB_DIR "/" LIB_NAME;
static bool
load_lib(AppAPI *api) {
struct stat st;
if (stat(lib_path, &st) != 0) {
return false;
}
if (lib_id != st.st_ino) {
void *handle = dlopen(lib_path, RTLD_NOW);
if (!handle) {
lib_handle = NULL;
lib_id = 0;
return false;
}
lib_handle = handle;
lib_id = st.st_ino;
const AppAPI *app_api = dlsym(lib_handle, "APP_API");
if (app_api == NULL) {
dlclose(lib_handle);
lib_handle = NULL;
lib_id = 0;
return false;
}
*api = *app_api;
}
return true;
}
static bool
_app_reload(AppAPI *api, AppState *state, PlatformAPI platform) {
struct stat st;
if (stat(lib_path, &st) == 0 && lib_id != st.st_ino) {
if (lib_handle) {
api->unload(state, platform);
dlclose(lib_handle);
}
if (!load_lib(api)) {
return false;
}
api->reload(state, platform);
}
return true;
}
static bool
_app_init(AppAPI *api, AppState *state, PlatformAPI platform) {
if (!load_lib(api)) {
fprintf(stderr, "error: can't open app library file: %s\n", lib_path);
return false;
}
api->init(state, platform);
return true;
}
static void
_app_destroy(AppAPI *api, AppState *state, PlatformAPI platform) {
api->destroy(state, platform);
if (lib_handle) {
dlclose(lib_handle);
lib_handle = NULL;
lib_id = 0;
}
}
#else
//
// Static linking of app code.
//
extern const AppAPI APP_API;
static bool
_app_reload() {
return true;
}
static bool
_app_init(AppAPI *api, AppState *state, PlatformAPI platform) {
*api = APP_API;
api->init(state, platform);
return true;
}
static void
_app_destroy(AppAPI *api, AppState *state, PlatformAPI platform) {
api->destroy(state, platform);
}
#endif
const PlatformAPI PLATFORM_API = {
.read_file = platform_read_file,
.malloc = malloc,
.free = free,
.calloc = calloc,
.realloc = realloc,
.log = platform_log,
.sleep = platform_sleep,
};
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