}
/* Implementation of mkostemp for MS-Windows, to avoid race conditions
- when using mktemp.
+ when using mktemp. Copied from w32.c.
- Standard algorithm for generating a temporary file name seems to be
- use pid or tid with a letter on the front (in place of the 6 X's)
- and cycle through the letters to find a unique name. We extend
- that to allow any reasonable character as the first of the 6 X's,
- so that the number of simultaneously used temporary files will be
- greater. */
+ This is used only in update-game-score.c. It is overkill for that
+ use case, since update-game-score renames the temporary file into
+ the game score file, which isn't atomic on MS-Windows anyway, when
+ the game score already existed before running the program, which it
+ almost always does. But using a simpler implementation just to
+ make a point is uneconomical... */
int
mkostemp (char * template, int flags)
/* Template is badly formed or else we can't generate a unique name. */
return -1;
}
+
+/* On Windows, you cannot rename into an existing file. */
+int
+sys_rename (const char *from, const char *to)
+{
+ int retval = rename (from, to);
+
+ if (retval < 0 && errno == EEXIST)
+ {
+ if (unlink (to) == 0)
+ retval = rename (from, to);
+ }
+ return retval;
+}