Add utilities to write strings to file

src/os/file/file.c

@@ -56,6 +56,16 @@ i64 wapp_file_write(const void *src_buf, WFile *file, u64 byte_count) {
 	return _file_write(src_buf, file, byte_count);
 }
 
+u64 wapp_file_read_str8(Str8 *str, WFile *file) {
+	wapp_debug_assert(str != NULL, "`str` should not be NULL.");
+	return wapp_file_read((void *)(str->buf), file, str->size);
+}
+
+i64 wapp_file_write_str8(Str8RO *str, WFile *file) {
+	wapp_debug_assert(str != NULL, "`str` should not be NULL.");
+	return wapp_file_write((void *)(str->buf), file, str->size);
+}
+
 u64 wapp_file_read_array(GenericArray dst_buf, WFile *file, u64 item_count) {
 	wapp_debug_assert(dst_buf != NULL && file != NULL,
 	                  "`dst_buf` and `file` should not be NULL.");

src/os/file/file.h

@@ -52,6 +52,8 @@ i64    wapp_file_seek(WFile *file, i64 offset, FileSeekOrigin origin);
 i64    wapp_file_get_length(WFile *file);
 u64    wapp_file_read(void *dst_buf, WFile *file, u64 byte_count);
 i64    wapp_file_write(const void *src_buf, WFile *file, u64 byte_count);
+u64    wapp_file_read_str8(Str8 *str, WFile *file);
+i64    wapp_file_write_str8(Str8RO *str, WFile *file);
 u64    wapp_file_read_array(GenericArray dst_buf, WFile *file, u64 item_count);
 i64    wapp_file_write_array(const GenericArray src_buf, WFile *file, u64 item_count);
 i32    wapp_file_flush(WFile *file);