C++ refactoring (#91)

Tactility/Source/ui/LabelUtils.cpp

@@ -0,0 +1,65 @@
+#include "LabelUtils.h"
+#include "TactilityCore.h"
+
+namespace tt::lvgl {
+
+#define TAG "tt_lv_label"
+
+static long file_get_size(FILE* file) {
+    long original_offset = ftell(file);
+
+    if (fseek(file, 0, SEEK_END) != 0) {
+        TT_LOG_E(TAG, "fseek failed");
+        return -1;
+    }
+
+    long file_size = ftell(file);
+    if (file_size == -1) {
+        TT_LOG_E(TAG, "Could not get file length");
+        return -1;
+    }
+
+    if (fseek(file, original_offset, SEEK_SET) != 0) {
+        TT_LOG_E(TAG, "fseek Failed");
+        return -1;
+    }
+
+    return file_size;
+}
+
+static char* str_alloc_from_file(const char* filepath) {
+    FILE* file = fopen(filepath, "rb");
+
+    if (file == nullptr) {
+        TT_LOG_E(TAG, "Failed to open %s", filepath);
+        return nullptr;
+    }
+
+    long content_length = file_get_size(file);
+
+    auto* text_buffer = static_cast<char*>(malloc(content_length + 1));
+    if (text_buffer == nullptr) {
+        TT_LOG_E(TAG, "Insufficient memory. Failed to allocate %ldl bytes.", content_length);
+        return nullptr;
+    }
+
+    int buffer;
+    uint32_t buffer_offset = 0;
+    text_buffer[0] = 0;
+    while ((buffer = fgetc(file)) != EOF && buffer_offset < content_length) {
+        text_buffer[buffer_offset] = (char)buffer;
+        buffer_offset++;
+    }
+    text_buffer[buffer_offset] = 0;
+
+    fclose(file);
+    return text_buffer;
+}
+
+void label_set_text_file(lv_obj_t* label, const char* filepath) {
+    char* text = str_alloc_from_file(filepath);
+    lv_label_set_text(label, text);
+    free(text);
+}
+
+} // namespace