-#include <stdint.h> /* for uint8_t, uint16_t */
-#include <stdio.h> /* for FILE typedef */
+#include <stdlib.h> /* for size_t */
+#include <stdint.h> /* for uint16_t */
#include "yx_uint16.h" /* for yx_uint16 coordinates */
struct World;
struct Map;
-/* Learn from "file" the largest line length (pointed to by "linemax_p"; length
- * includes newline chars) and (pointed to by "n_lines_p" if it is not set to
- * NULL) the number of lines (= number of newline chars).
- *
- * Returns 0 on success, 1 on error of fseek() (called to return to initial file
- * reading position).
+/* Returns message: "Trouble in ".parent." with ".child."." (try_*() helper) */
+extern char * trouble_msg(struct World * w, char * parent, char * child);
+
+/* Wrappers to malloc(), calloc() from function called "f" calling exit_err()
+ * with trouble_msg() error message if necessary.
*/
-extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
- uint16_t * n_lines_p);
+extern void * try_malloc(size_t size, struct World * w, char * f);
+extern void * try_calloc(size_t nmemb, size_t size,
+ struct World * w, char * f);
+
+
+
+/* Check if tempfile "path" exists, and if so, exit with explanation that. */
+extern void check_tempfile(char * path, struct World * f);
+
+/* If one and only one of files at "p1", "p2" exists, fail with explanation. */
+extern void check_files_xor(char * p1, char * p2, struct World * w);