X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.h;h=bebcdc058c39ee6c1298f0b37acf8fec2858efbe;hb=550d22ec0c3f530f5d317746f3f7e75251a1de4b;hp=42a7c3a5c4c6e1968e9a0b8b6b5dc9dffa467801;hpb=b9082c113c43afe5c6a11c2b72f845ee2f8c6aea;p=plomrogue

diff --git a/src/readwrite.h b/src/readwrite.h
index 42a7c3a..bebcdc0 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -1,7 +1,6 @@
 /* readwrite.h:
  *
- * Routines for reading/writing (multi-)byte data from/to files. They ensure a
- * defined endianness.
+ * Routines for reading and writing files.
  */
 
 #ifndef READWRITE_H
@@ -10,13 +9,55 @@
 
 
 #include <stdio.h> /* for FILE typedef */
-#include <stdint.h> /* for uint16_t, uint32_t */
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
+struct World;
 
 
 
-/* Each function returns 0 on success and 1 on failure. "x" is the value to be
- * written to "file" for write_* functions and for read_* functions the pointer
- * to where the value read from "file" is to be written.
+/* Wrappers to calling from function called "f" of fopen(), fclose(), fgets()
+ * and fwrite() and calling exit_err() with appropriate error messages.
+ */
+extern FILE * try_fopen(char * path, char * mode, struct World * w, char * f);
+extern void try_fclose(FILE * file, struct World * w, char * f);
+extern void try_fgets(char * line, int size, FILE * file,
+                      struct World * w, char * f);
+extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
+                       struct World * w, char * f);
+
+
+
+/* Wrapper to successive call of fclose() from function called "f" on "file",
+ * then unlink() on file at "p2" if it exists, then rename() on "p1" to "p2".
+ * Used for handling atomic saving of files via temp files.
+ */
+extern void try_fclose_unlink_rename(FILE * file, char * p1, char * p2,
+                                     struct World * w, char * f);
+
+
+
+/* Wrapper: Call textfile_sizes() from function called "f" to get max line
+ * length of "file", exit via exit_err() with trouble_msg()-generated error
+ * message on failure.
+ */
+extern uint16_t get_linemax(FILE * file, struct World * w, char * f);
+
+
+
+/* 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).
+ */
+extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
+                              uint16_t * n_lines_p);
+
+
+
+/* These routines for reading values "x" from / writing values to "file" ensure
+ * a defined endianness and consistent error codes: return 0 on success and 1 on
+ * fgetc()/fputc() failure.
  */
 extern uint8_t read_uint8(FILE * file, uint8_t * x);
 extern uint8_t read_uint16_bigendian(FILE * file, uint16_t * x);