Move log to shared component

shared/log.c

@@ -0,0 +1,48 @@
+/**
+ * Copyright 2021 Johannes Marbach
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+
+#include "log.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+
+
+/**
+ * Static variables
+ */
+
+static bb_log_level log_level = BB_LOG_LEVEL_ERROR;
+
+
+/**
+ * Public functions
+ */
+
+void bb_log_set_level(bb_log_level level) {
+    log_level = level;
+}
+
+void bb_log(bb_log_level level, const char *format, ...) {
+    if (level > log_level) {
+        return;
+    }
+
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr, format, args);
+    va_end(args);
+
+    size_t l = strlen(format);
+    if (l > 0 && format[l - 1] != '\n') {
+        fprintf(stderr, "\n");
+    }
+}
+
+void bb_log_print_cb(lv_log_level_t level, const char *msg) {
+    LV_UNUSED(level);
+    bb_log(BB_LOG_LEVEL_VERBOSE, msg);
+}