From e24186fc1917c5e8b91924af0c3c7c55816ff5d6 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Mon, 25 Jan 2021 22:01:00 +0100
Subject: Introducing MIC

---
 src/platform_posix.c | 171 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 src/platform_posix.c

(limited to 'src/platform_posix.c')

diff --git a/src/platform_posix.c b/src/platform_posix.c
new file mode 100644
index 0000000..7c2fb6c
--- /dev/null
+++ b/src/platform_posix.c
@@ -0,0 +1,171 @@
+#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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