+/* The default size for file buffers. Must be at least 256. */
+#define _PDCLIB_BUFSIZ 1024
+
+/* The minimum number of files the implementation can open simultaneously. Must
+ be at least 8. Depends largely on how the bookkeeping is done by fopen() /
+ freopen() / fclose(). The example implementation limits the number of open
+ files only by available memory.
+*/
+#define _PDCLIB_FOPEN_MAX 8
+
+/* Length of the longest filename the implementation guarantees to support. */
+#define _PDCLIB_FILENAME_MAX 128
+
+/* Maximum length of filenames generated by tmpnam(). (See tmpfile.c.) */
+#define _PDCLIB_L_tmpnam 46
+
+/* Number of distinct file names that can be generated by tmpnam(). */
+#define _PDCLIB_TMP_MAX 50
+