added macro RESULT_ERROR_FMT and some filesystem functions

include/tlibc/errors.h

@@ -41,6 +41,7 @@ typedef struct Result_ {
 
 
 #define RESULT_ERROR(MSG, IS_MSG_ON_HEAP) (Result_){ .error = Error_create(MSG, IS_MSG_ON_HEAP, ErrorCallPos_here()) }
+#define RESULT_ERROR_FMT(FORMAT, ARGS...) RESULT_ERROR(sprintf_malloc(4096, FORMAT, ARGS), true)
 #define RESULT_VOID (Result_){ .error = NULL }
 #define RESULT_VALUE(FIELD, V) (Result_){ .error = NULL, .FIELD = V }
 

include/tlibc/filesystem.h

@@ -47,6 +47,15 @@ Result(FILE*) file_open(cstr file_name, cstr fopen_mode);
 
 bool file_exists(cstr path);
 
+Result(i64) file_getSize(FILE* f);
+
+typedef enum SeekOrigin {
+    SeekOrigin_Start = SEEK_SET,
+    SeekOrigin_Current = SEEK_CUR,
+    SeekOrigin_End = SEEK_END,
+} SeekOrigin;
+
+Result(void) file_seek(FILE* f, i64 offset, SeekOrigin origin);
 
 
 bool dir_exists(cstr path);