Create libioutil, implement a filewriter

libioutil/filewriter.h

@@ -0,0 +1,36 @@
+#ifndef _LIBIOUTIL_FILEWRITER_H
+#define _LIBIOUTIL_FILEWRITER_H
+
+#include <path_defs.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#define FW_OK                0
+#define FW_VOLUME_OPEN_ERROR 1
+#define FW_DESC_ERROR        2
+#define FW_NOT_FILE          3
+#define FW_VOLUME_NOT_OPENED 4
+#define FW_WRITE_ERROR       5
+#define FW_CURSOR_OOB        6
+#define FW_CREATE_FILE_ERROR 7
+
+#define FW_CREATE_FILE (1 << 0)
+#define FW_APPEND      (1 << 1)
+#define FW_OPEN        (1 << 31)
+
+struct filewriter {
+  char volume[VOLUME_MAX];
+  char path[PATH_MAX];
+  size_t write_cursor;
+  size_t file_size;
+  uint32_t flags;
+};
+
+int filewriter_init (struct filewriter* fw, const char* volume, const char* path, uint32_t flags);
+
+int filewriter_fini (struct filewriter* fw);
+
+int filewriter_write (struct filewriter* fw, uint8_t* buffer, size_t buffer_size);
+
+#endif // _LIBIOUTIL_FILEWRITER_H