Move log to shared component

shared/cursor/cursor.h

@@ -4,12 +4,12 @@
  */
 
 
-#ifndef UL_CURSOR_H
-#define UL_CURSOR_H
+#ifndef BB_CURSOR_H
+#define BB_CURSOR_H
 
 #include "lvgl/lvgl.h"
 
 /* Image description of the mouse cursor */
 extern const lv_img_dsc_t bb_cursor_img_dsc;
 
-#endif /* UL_CURSOR_H */
+#endif /* BB_CURSOR_H */

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);
+}

shared/log.h

@@ -0,0 +1,48 @@
+/**
+ * Copyright 2021 Johannes Marbach
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+
+#ifndef BB_LOG_H
+#define BB_LOG_H
+
+#include "lvgl/lvgl.h"
+
+/**
+ * Log levels
+ */
+typedef enum {
+    /* Errors only */
+    BB_LOG_LEVEL_ERROR   = 0,
+    /* Warnings and errors */
+    BB_LOG_LEVEL_WARNING = 1,
+    /* Include non-errors in log */
+    BB_LOG_LEVEL_VERBOSE = 2
+} bb_log_level;
+
+/**
+ * Set the log level.
+ * 
+ * @param level new log level value
+ */
+void bb_log_set_level(bb_log_level level);
+
+/**
+ * Log a message. A newline character is appended unless the message ends in one.
+ * 
+ * @param level log level of the message
+ * @param format message format string
+ * @param ... parameters to fill into the format string
+ */
+void bb_log(bb_log_level level, const char *format, ...);
+
+/**
+ * Handle an LVGL log message.
+ *
+ * @param level LVGL log level
+ * @param msg message to print
+ */
+void bb_log_print_cb(lv_log_level_t level, const char *msg);
+
+#endif /* BB_LOG_H */