X-Git-Url: https://plomlompom.com/repos/feed.xml?a=blobdiff_plain;f=src%2Freadwrite.h;h=0dc47da9eb4a7ee404bf48892e49868d76475caf;hb=89c4ab4e0d6d7bb9d51d6714afae52603b465fc0;hp=128e44a8a3e5534e40c7a98fa8feba800d53788f;hpb=0e6c855b67e0cd3def7196396f3d1f45ff85b692;p=plomrogue

diff --git a/src/readwrite.h b/src/readwrite.h
index 128e44a..0dc47da 100644
--- a/src/readwrite.h
+++ b/src/readwrite.h
@@ -6,34 +6,50 @@
 #ifndef READWRITE_H
 #define READWRITE_H
 
-
-
 #include <stdio.h> /* for FILE typedef */
 #include <stdint.h> /* for uint8_t, uint16_t, uint32_t */
 
 
 
-/* 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).
+/* Wrappers to fopen(), fclose(), fgets() and fwrite() from function called "f",
+ * calling exit_err() upon error with appropriate error messages.
  */
-extern uint8_t textfile_sizes(FILE * file, uint16_t * linemax_p,
-                              uint16_t * n_lines_p);
+extern FILE * try_fopen(char * path, char * mode, char * f);
+extern void try_fclose(FILE * file, char * f);
+extern void try_fwrite(void * ptr, size_t size, size_t nmemb, FILE * stream,
+                       char * f);
+extern void try_fputc(uint8_t c, FILE * file, char * f);
+
+/* Wrapper to calling fgets() from function called "f". The return code of
+ * fgets() is returned unless it is NULL *and* ferror() indicates that an error
+ * occured; otherwise end of file is assumed and NULL is returned properly.
+ */
+extern char * try_fgets(char * line, int size, FILE * file, char * f);
 
+/* Wrapper to calling fgetc() from function "f", treating either
+ * (try_fgetc_noeof()) all EOF returns as errors triggering exit_trouble(), or
+ * (try_fgetc()) only those accompanied by a positive ferror() result.
+ */
+extern int try_fgetc(FILE * file, char * f);
+extern uint8_t try_fgetc_noeof(FILE * file, char * f);
 
+/* Wrapper to successive call of fclose() from function called "f" on "file",
+ * then unlink() on file at path "p2" if it exists, then rename() from path "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,
+                                     char * f);
 
-/* 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.
+/* Return largest line length from "file" the largest line length (including
+ * newline chars) and write the number of newline chars in "file" to the memory
+ * pointed to by "n_lines_p" if it is not passed as NULL.
  */
-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);
+extern uint16_t textfile_sizes(FILE * file, uint16_t * n_lines_p);
+
+/* Read/write via try_(fgetc|fputc)() uint32 values with defined endianness. */
+extern uint32_t read_uint32_bigendian(FILE * file);
+extern void write_uint32_bigendian(uint32_t x, FILE * file);
+
+
 
 #endif