X-Git-Url: https://plomlompom.com/repos/?a=blobdiff_plain;f=src%2Freadwrite.h;h=bcdf10eb20632caada30e8ee02fb35cd586ee8cf;hb=918a7b6c22411b67f5c5aa2aa4d1c166ad765aca;hp=dd4e23717d75ecb4ea04a7f2dc86b631f96d1c2a;hpb=b944d403e356e444b47b0f5768406c0527151be0;p=plomrogue

diff --git a/src/readwrite.h b/src/readwrite.h
index dd4e237..bcdf10e 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -1,12 +1,67 @@
+/* readwrite.h:
+ *
+ * Routines for reading and writing files.
+ */
+
 #ifndef READWRITE_H
 #define READWRITE_H
 
-#include <stdio.h>
-#include <stdint.h>
 
-extern uint16_t read_uint16_bigendian(FILE * file);
-extern void write_uint16_bigendian(uint16_t x, FILE * file);
-extern uint32_t read_uint32_bigendian(FILE * file);
-extern void write_uint32_bigendian(uint32_t x, FILE * file);
+
+#include <stdio.h> /* for FILE typedef */
+#include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
+struct World;
+
+
+
+/* Wrappers to calling from function called "f" of fopen(), fclose() and fgets()
+ * 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);
+
+
+
+/* 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);
+extern uint8_t read_uint32_bigendian(FILE * file, uint32_t * x);
+extern uint8_t write_uint8(uint8_t x, FILE * file);
+extern uint8_t write_uint16_bigendian(uint16_t x, FILE * file);
+extern uint8_t write_uint32_bigendian(uint32_t x, FILE * file);
 
 #endif