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Jim Blandy 1998-10-09 11:50:21 +00:00
parent 0f88a8f3bd
commit 1cf84ea500
2 changed files with 39 additions and 1 deletions
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2
HACKING
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@ -138,7 +138,7 @@ the configure script.
those are vestiges of a time when Guile was meant to compile on
pre-ANSI compilers. Guile now requires ANSI C, so when you write new
functions, feel free to use ANSI declarations, and please provide
prototypes for everything.
prototypes for everything. You don't need to use SCM_P in new code.
Jim Blandy

38
NEWS
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@ -526,6 +526,44 @@ are now incorrect, since they will return early, and fail to mark any
other objects the smob refers to. Some code in the Guile library used
to work this way.
** The semantics of the I/O port functions in scm_ptobfuns have changed.
If you have implemented your own I/O port type, by writing the
functions required by the scm_ptobfuns and then calling scm_newptob,
you will need to change your functions slightly.
The functions in a scm_ptobfuns structure now expect the port itself
as their argument; they used to expect the `stream' member of the
port's scm_port_table structure. This allows functions in an
scm_ptobfuns structure to easily access the port's cell (and any flags
it its CAR), and the port's scm_port_table structure.
Guile now passes the I/O port itself as the `port' argument in the
following scm_ptobfuns functions:
int (*free) (SCM port);
int (*fputc) (int, SCM port);
int (*fputs) (char *, SCM port);
scm_sizet (*fwrite) SCM_P ((char *ptr,
scm_sizet size,
scm_sizet nitems,
SCM port));
int (*fflush) (SCM port);
int (*fgetc) (SCM port);
int (*fclose) (SCM port);
The interfaces to the `mark', `print', `equalp', and `fgets' methods
are unchanged.
If you have existing code which defines its own port types, it is easy
to convert your code to the new interface; simply apply SCM_STREAM to
the port argument to yield the value you code used to expect.
Note that since both the port and the stream have the same type in the
C code --- they are both SCM values --- the C compiler will not remind
you if you forget to update your scm_ptobfuns functions.
** Function: int scm_internal_select (int fds,
SELECT_TYPE *rfds,
SELECT_TYPE *wfds,