Merged branch stdio_rewrite back into trunk.

[pdclib] / internals / _PDCLIB_glue.h

diff --git a/internals/_PDCLIB_glue.h b/internals/_PDCLIB_glue.h
index 96cedca1e66f0d4d6404eb20be7f61d506cc4011..3c5872bcbeab7744d215b9b765d78e9cc72ab684 100644 (file)
--- a/internals/_PDCLIB_glue.h
+++ b/internals/_PDCLIB_glue.h
@@ -15,9 +15,11 @@
 /* OS "glue", part 2                                                          */
 /* These are the functions you will have to touch, as they are where PDCLib   */
 /* interfaces with the operating system.                                      */
-/* Some operate on data types defined by _PDCLIB_config.h.                    */
+/* They operate on data types partially defined by _PDCLIB_config.h.          */
 /* -------------------------------------------------------------------------- */
 
+/* stdlib.h */
+
 /* A system call that terminates the calling process, returning a given status
    to the environment.
 */
@@ -30,23 +32,31 @@ void _PDCLIB_Exit( int status ) _PDCLIB_NORETURN;
 */
 void * _PDCLIB_allocpages( int n );
 
+
+/* stdio.h */
+
 /* A system call that opens a file identified by name in a given mode. Return 
    a file descriptor uniquely identifying that file.
    (The mode is the return value of the _PDCLIB_filemode() function.)
 */
 _PDCLIB_fd_t _PDCLIB_open( char const * const filename, unsigned int mode );
 
-/* A system call that writes up to n characters to a file identified by given
-   file descriptor. Return the number of characters actually written, or -1
-   if an error occured. Note that the number of characters may well be lower
-   than n without an error having occured.
+/* A system call that writes a stream's buffer.
+   Returns 0 on success, EOF on write error.
+   Sets stream error flags and errno appropriately on error.
 */
-int _PDCLIB_write( struct _PDCLIB_file_t * stream, char const * buffer, int n );
+int _PDCLIB_flushbuffer( struct _PDCLIB_file_t * stream );
 
-/* A system call that reads n characters into a buffer, from a file identified
-   by given file descriptor. Return the number of characters read.
+/* A system call that fills a stream's buffer.
+   Returns 0 on success, EOF on read error / EOF.
+   Sets stream EOF / error flags and errno appropriately on error.
 */
-_PDCLIB_size_t _PDCLIB_read( _PDCLIB_fd_t fd, char * buffer, _PDCLIB_size_t n );
+int _PDCLIB_fillbuffer( struct _PDCLIB_file_t * stream );
+
+/* A system call that repositions within a file. Returns new offset on success,
+   -1 / errno on error.
+*/
+_PDCLIB_int64_t _PDCLIB_seek( struct _PDCLIB_file_t * stream, _PDCLIB_int64_t offset, int whence );
 
 /* A system call that closes a file identified by given file descriptor. Return
    zero on success, non-zero otherwise.
@@ -60,12 +70,8 @@ int _PDCLIB_remove( const char * filename );
 
 /* A system call that renames a file from given old name to given new name.
    Return zero on success, non-zero otherwise. In case of failure, the file
-   must still be accessible by old name.
+   must still be accessible by old name. Any handling of open files etc. is
+   done by standard rename() already.
 */
 int _PDCLIB_rename( const char * old, const char * new );
 
-/* A system call that returns one if the given file descriptor refers to an
-   interactive device, and zero otherwise.
- */
-int _PDCLIB_isinteractive( _PDCLIB_fd_t fd );
-