+/* Parsing any fopen() style filemode string into a number of flags. */
+unsigned int _PDCLIB_filemode( const char * mode );
+
+/* Sanity checking and preparing of read buffer, should be called first thing
+ by any stdio read-data function.
+ Returns 0 on success, EOF on error.
+ On error, EOF / error flags and errno are set appropriately.
+*/
+int _PDCLIB_prepread( struct _PDCLIB_file_t * stream );
+
+/* Sanity checking, should be called first thing by any stdio write-data
+ function.
+ Returns 0 on success, EOF on error.
+ On error, error flags and errno are set appropriately.
+*/
+int _PDCLIB_prepwrite( struct _PDCLIB_file_t * stream );
+
+/* Closing all streams on program exit */
+void _PDCLIB_closeall( void );
+
+/* -------------------------------------------------------------------------- */
+/* errno */
+/* -------------------------------------------------------------------------- */
+
+/* If PDCLib would call its error number "errno" directly, there would be no way
+ to catch its value from underlying system calls that also use it (i.e., POSIX
+ operating systems). That is why we use an internal name, providing a means to
+ access it through <errno.h>.
+*/
+extern int _PDCLIB_errno;
+
+/* A mechanism for delayed evaluation. (Not sure if this is really necessary, so
+ no detailed documentation on the "why".)
+*/
+int * _PDCLIB_errno_func( void );
+
+/* -------------------------------------------------------------------------- */
+/* <ctype.h> lookup tables */
+/* -------------------------------------------------------------------------- */
+
+#define _PDCLIB_CTYPE_ALPHA 1
+#define _PDCLIB_CTYPE_BLANK 2
+#define _PDCLIB_CTYPE_CNTRL 4
+#define _PDCLIB_CTYPE_GRAPH 8
+#define _PDCLIB_CTYPE_PUNCT 16
+#define _PDCLIB_CTYPE_SPACE 32
+#define _PDCLIB_CTYPE_LOWER 64
+#define _PDCLIB_CTYPE_UPPER 128
+#define _PDCLIB_CTYPE_DIGIT 256
+#define _PDCLIB_CTYPE_XDIGT 512
+
+struct _PDCLIB_ctype_t
+{
+ _PDCLIB_uint16_t flags;
+ unsigned char upper;
+ unsigned char lower;
+ unsigned char collation;
+};
+
+/* -------------------------------------------------------------------------- */
+/* Sanity checks */
+/* -------------------------------------------------------------------------- */
+
+_PDCLIB_static_assert( sizeof( short ) == _PDCLIB_SHRT_BYTES, "Compiler disagrees on _PDCLIB_SHRT_BYTES." );
+_PDCLIB_static_assert( sizeof( int ) == _PDCLIB_INT_BYTES, "Compiler disagrees on _PDCLIB_INT_BYTES." );
+_PDCLIB_static_assert( sizeof( long ) == _PDCLIB_LONG_BYTES, "Compiler disagrees on _PDCLIB_LONG_BYTES." );
+_PDCLIB_static_assert( sizeof( long long ) == _PDCLIB_LLONG_BYTES, "Compiler disagrees on _PDCLIB_LLONG_BYTES." );
+
+_PDCLIB_static_assert( ( (char)-1 < 0 ) == _PDCLIB_CHAR_SIGNED, "Compiler disagrees on _PDCLIB_CHAR_SIGNED." );
+_PDCLIB_static_assert( sizeof( sizeof( int ) ) == sizeof( _PDCLIB_size ), "Compiler disagrees on _PDCLIB_size." );
+
+_PDCLIB_static_assert( sizeof( _PDCLIB_wchar ) == sizeof( L'x' ), "Compiler disagrees on _PDCLIB_wchar." );
+
+_PDCLIB_static_assert( sizeof( void * ) == sizeof( _PDCLIB_intptr ), "Compiler disagrees on _PDCLIB_intptr." );
+
+_PDCLIB_static_assert( sizeof( &_PDCLIB_digits[1] - &_PDCLIB_digits[0] ) == sizeof( _PDCLIB_ptrdiff ), "Compiler disagrees on _PDCLIB_ptrdiff." );
+
+#endif