* ioext.c (scm_do_read_line): Rewritten to use memchr to find the

	* ioext.c (scm_do_read_line): Rewritten to use memchr to find the
	newline.  A bit faster, and definitely hairier.
	(scm_read_line): Count newlines here instead.
	* strings.c (scm_take_str): New function.
	(scm_take0str): Reimplement in terms of scm_take_str.  * strings.h
	(scm_take_str): New declaration.  * ioext.c (scm_read_line): Use
	scm_take_str, to avoid copying the string.
	Add some simple-minded support for line buffered ports.
	* ports.h (SCM_BUFLINE): New flag for ports.
	* init.c (scm_init_standard_ports): Request line-buffering on
	the standard output port.
*	* ports.c (scm_mode_bits): Recognize 'l' as a request for line
	buffering.
	(scm_putc, scm_puts, scm_lfwrite): If the port is line-buffered,
	and there's a newline to be written, flush the port.
	* ports.c: (scm_lseek): clear buffers even if just reading current
	position.
	* fports.c (local_fclose): call local_fflush unconditionally.
	(various): don't use the scm_must... memory procs.
	* ports.h (scm_port): make read_pos a pointer to const.
	strports.c: take care of rw_active and rw_randow.
	fports.c: scm_fport_drain_input: removed.  do it all in ports.c.
	strports.c (scm_mkstrport): check that pos is reasonable.
	ioext.c (scm_ftell, scm_fseek): use lseek.
	(SCM_CLEAR_BUFFERS): macro deleted.
	ioext.c (redirect_port: use ptob fflush, read_flush.
	ports.h (scm_ptobfuns): add ftruncate.
	ports.c (scm_newptob): set ftruncate.
	adjust ptob tables.
*	ports.c (scm_ftruncate): new procedure.
	fports.c (local_ftrunate), strports.c (str_ftruncate): new procs.
	strports.c (st_seek, st_grow_port): new procs.
	fports.h (scm_port): change size types from int to off_t.
	ports.c (scm_init_ports): initialise the seek symbols here
	instead of in ioext.c.
	strports.c (scm_call_with_output_string): start with an empty
	string, so seek and ftruncate can be used.
	* ports.h (scm_ptobfuns): add a read_flush procedure which is the
	equivalent to fflush for the read buffer.
	* ports.c (scm_newptob): set read_flush.
	ports.c (void_port_ptob): set read_flush.
	fports.c (local_read_flush): new proc.  add to ptob.
	strport.c (st_read_flush): likewise.
	vport.c (sf_read_flush): likewise.
	fports.h (struct scm_fport): remove random member.  there's nothing
	left but fdes.  leaving it as a struct to allow for future changes.
	fports.c: replace usage of scm_fport::random with scm_port::rw_random.
	ports.c: (scm_putc, scm_puts, scm_lfwrite): call the read_flush
	ptob proc if the read buffer is filled.
	* ports.h (scm_port): add a rw_random member and replace
	reading and writing members with rw_active member.
	SCM_PORT_READ/SCM_PORT_WRITE: new values.
	* ports.h (struct scm_port_table): add writing and reading members
	to replace write_needs_seek: it isn't good enough for non-fports.
	ports.c, ioext.c, fports.c: corresponding changes.
	(struct scm_port_table): give it a typedef and rename to scm_port.
	ports.c, fports.c, strports.c, vports.c, ioext.c, ports.h:
	corresponding changes.
	* ports.c (scm_newptob): bugfix: set seek member.
*	* (scm_lseek): new procedure, using code from ioext.c:scm_fseek
	and generalised to all port types.
	* scmsigs.c (scm_init_scmsigs): set the SA_RESTART flag for all
	signals (it was only being done for handlers installed from Scheme).
	Otherwise (for example) SIGSTOP followed by SIGCONT on an interpreter
	waiting for input caused an EINTR error from read.
	* ports.h (struct scm_port_table): make all the char members
	unsigned, so they convert to int without becoming negative if large.
	* fports.c (scm_fdes_wait_for_input): forgot to check compilation
	with threads enabled.  rename this procedure to
	fport_wait_for_input and take a port instead of a fdes.
	use scm_fport_input_waiting_p instead of scm_fdes_waiting_p.
	* readline.c (scm_readline): Applied a patch from Greg Harvey to
	get readline support working again: use fdopen to get FILE objects.
	* gc.c (scm_init_storage): install an atexit proc to flush the
	ports.
	(cleanup): the new proc.  it sets a global variable which can be
	checked by the ptob flush procs to avoid trying to throw
	exceptions during exit.  not very pleasant but it seems more reliable.
	* fports.c (local_fflush): check terminating variable and if set
	don't throw exception.
	* CHECKME: that the atexit proc is installed if unexec used.
	* throw.c (scm_handle_by_message): don't flush all ports here.
	it still causes bus errors.
	* fports.h (SCM_FPORT_CLEAR_BUFFERS): rename to SCM_CLEAR_BUFFERS
	and move to ioext.c.
	* fports.c (scm_fdes_waiting_p): merged into fport_input_waiting_p.
	* ports.c (scm_char_ready_p): check the port buffer and call the
	ptob entry if needed.
	* ports.h (scm_ptobfuns): input_waiting_p added.  change all the
	ptob initialisers.  use it in char-ready
	* ioext.c (scm_do_read_line): moved from ports.c.  make it static.
	* vports.c (sfflush): modified to write a char (since softports
	currently use shortbuf.)
	* fports.c (scm_standard_stream_to_port): moved to init.c and
	made static.
	* init.c (scm_init_standard_ports): make stdout and stderr
	unbuffered if connected to a terminal.  with stdio they
	were line-buffered by default.
	* ports.h (scm_ptobfuns): change fflush return to void.
	change flush proc definitions.
	* strports.c (scm_call_with_output_string): get size from
	buffer instead of port stream.
	(scm_strprint_obj): likewise.
	(st_flush): new proc.
	* ports.h (struct scm_port_table): added write_end member,
	as an optimisation.  set it where write_buf_size is set.
	* ports.h (struct scm_port_table): change stream from void *
	back to SCM.  SCM presumably must be large enough to hold a
	pointer (and probably vice versa but who knows.)
	(SCM_SSTREAM): deleted.  change users back to SCM_STREAM.
	(scm_puts): rewritten
	* fports.c (local_ffwrite, local_fputs): removed.
	* strports.c (stputc, stputs, stwrite): dyked out (FIXME)
	* vports.c (sfputc, sfputs, sfwrite) likewise.
	* ports.c (write_void_port, puts_void_port): removed.
	(putc_void_port, getc_void_port, fgets_void_port): likewise.
	* ports.c (scm_lfwrite): rewritten using fport.c version.
	* fports.c (local_fputc): deleted.
	* ports.c (scm_add_to_port_table): initialise write_needs_seek.
	* ports.h (scm_ptobfuns): add seek function pointer.
	* fports.c: set it to local_seek, new procedure.
	* fports.h (SCM_MAYBE_DRAIN_INPUT): moved to ports.c.
	use ptob for seek. take ptob instead of fport arg.
	* ports.h (struct scm_port_table): new member write_needs_seek,
	replaces reading member in fport struct.
	* vports.c (sfgetc): store the getted char into the buffer.
	rename to sf_fill_buffer and install it for fill-buffer in ptob.
	the Scheme interface is still a	procedure that gets a char.
	(scm_make_soft_port): set up the port buffer (shortbuf).
	* fports.c (local_fgetc, local_fgets): deleted.
	* strports.c (stgetc): likewise.
	* ports.c: scm_generic_fgets: likewise.
	* ports.h (scm_ptobfuns): add fill_buffer.
	* ports.c (scm_newptob): assign it.
	* strports.c (scm_mkstrport): set up the buffer.
	put just the string into the stream, not cons (pos stream).
	(stfill_buffer): new proc.
	* ports.h: fport buffer moved into port table: to be
	used for all port types.
	* throw.c (scm_handle_by_message): flush ports at exit.
	* socket.c (scm_sock_fd_to_port): use scm_fdes_to_port.
	(scm_getsockopt, scm_setsockopt, scm_shutdown, scm_connect,
	scm_bind, scm_listen, scm_accept, scm_getsockname,
	scm_getpeername, scm_recv, scm_send, scm_recvfrom,
	scm_sendto,
	use SCM_FPORT_FDES.  use SCM_OPFPORTP not SCM_FPORTP.
	* posix.c (scm_getgroups): use SCM_ALLOW/DEFER_INTS.
	(scm_ttyname): use SCM_FPORT_FDES.
	(scm_tcgetpgrp, scm_tcsetpgrp): likewise.
	* ioext.c (scm_isatty_p): use SCM_FPORT_FDES.
	(scm_fdes_to_ports): modified.
	(scm_fdopen): use scm_fdes_to_port.
	* ports.c (scm_init_ports): don't try to flush ports using
	atexit().  it's too late, errors will cause SEGV.
	* fports.c (scm_fport_buffer_add): new procedure.
	* fports.h (SCM_FDES_RANDOM_P): new macro.  use it in
	scm_fdes_to_port and scm_redirect_port.
	* ioext.c (scm_redirect_port): use setvbuf to set buffers in the
	new port.  reset fp->random.
	* fports.c (scm_fdes_to_port), ports.c (scm_void_port),
	filesys.c (scm_opendir):
	restore defer interrupts while the port is constructed.
*	(scm_setvbuf): if mode is _IOFBF and size is not supplied,
	derive buffer size from fdes or use a default.
	(scm_fdes_to_port): use setvbuf instead of creating the buffers
	directly.
	vports.c (various places): use SCM_SSTREAM.
	strports.c: likewise.
	* gdbint.c: likewise.
	* ports.h (SCM_SSTREAM): new macro.
	* fports.c (scm_input_waiting_p): use scm_return_first, since port
	may be removed from the stack by the tail call to scm_fdes_waiting_p.
	* fports.h (SCM_CLEAR_BUFFERS): new macro.
	* ports.c (scm_force_output): call scm_fflush.
	* print.c (scm_newline): don't check errno for EPIPE (it wouldn't
*	reach this point.)  don't flush port (if scm_cur_outp).
	* fports.h (SCM_FPORT_FDES): new macro.
	* vports.c (sfflush): don't need to set errno.
	* ports.c: install scm_flush_all_ports to be run on exit.
	ports.c fports.c ioext.c posix.c socket.c net_db.c filesys.c:
	removed all uses of SCM_DEFER/ALLOW ints for now.  they were mainly
	just protecting errno.  some may need to be put back.
	* scmsigs.c (take_signal): save and restore errno while this
	proc runs.
	*fports.c (print_pipe_port, local_pclose, scm_pipob): deleted.
*	open-pipe, close-pipe are emulated in (ice-9 popen)
	ports.c (scm_ports_prehistory): don't init scm_pipob.
	ports.h (scm_tc16_pipe): deleted.
	posix.c (scm_open_pipe, scm_close_pipe): deleted.
	* ioext.c (scm_primitive_move_to_fdes): use fport.
	* fport.c (scm_fport_fill_buffer): flush write buffer if needed.
	change arg type from scm_fport to SCM port.
	fport.h (SCM_SETFDES): removed.
	(SCM_MAYBE_DRAIN_INPUT): new macro.
	* ioext.c (scm_dup_to_fdes): use SCM_FSTREAM.
	(scm_ftell): always use lseek and account for the buffer.
	(scm_fileno): use fport buffer.
	(scm_fseek): clear fport buffers.  always use lseek.
	* posix.c (scm_pipe): use fport buffer.
	* unif.c: include fports.h instead of genio.h.
	* fports.c (scm_fdes_wait_for_input, scm_fport_fill_buffer): new
	procedures.
	(local_fgetc): use them.
	(local_ffwrite): use buffer.
	(local_fgets): use buffer.
	(scm_setbuf0): deleted.
	(scm_setvbuf): set the buffer.
	(scm_setfileno): deleted.
	(scm_evict_ports): set fdes directly.
*	(scm_freopen): deleted.  doesn't seem useful in Guile.
	(scm_stdio_to_port): deleted.
	fports.h (struct scm_fport): add shortbuf member to avoid separate
	code for unbuffered ports.
	(SCM_FPORTP, SCM_OPFPORTP, SCM_OPINFPORTP, SCM_OPOUTFPORTP): moved
	from ports.h.
	* genio.c, genio.h: move contents into ports.c, ports.h.  The
	division wasn't useful.
	* fports.c, fports.h (scm_fport_drain_input): new procedure.
	* ports.c (scm_drain_input): call scm_fport_drain_input.
	* scm_fdes_waiting_p: new procedure.
	* fports.c (scm_fdes_to_port): allocate read and/or write buffers.
	(scm_input_waiting_p): check the buffer.
	(local_fgetc, local_fflush, local_fputc): likewise.
	* fports.h (scm_fport): read/write_buf,_pos,_buf_end,,_buf_size:
	new members.
	* init.c (scm_init_standard_ports): pass fdes instead of FILE *.
*	* ports.c (scm_drain_input): new procedure.
	ports.h: prototype.
	* fports.c (FPORT_READ_SAFE, FPORT_WRITE_SAFE, FPORT_ALL_OKAY,
	pre_read, pre_write): removed.
	(local_fputc, local_fputs, local_ffwrite): use write, not stdio.
	(scm_standard_stream_to_port): change first arg from FILE * to
	int fdes.
	(local_fflush): flush fdes, not FILE *.
	* fports.h (SCM_NOFTELL): removed.
	* genio.c, ports.c: don't include filesys.h.
	* genio.c (scm_getc): don't use scm_internal_select if FPORT.
	do it in fports.c:local_fgetc.
	* genio.c: don't use SCM_SYSCALL when calling ptob procedures.
	do it where it's needed in the port smobs.
	* filesys.c (scm_input_waiting_p): moved to fports.c, stdio
	  buffer support removed.  take SCM arg, not FILE *.
	* filesys.h: prototype moved too.
	* fports.c (scm_fdes_to_port): new procedure.
	(local_fgetc): use read not fgetc.
	(local_fclose): use close, not fclose.
	(local_fgets): use read, not fgets
	* fports.h: prototype for scm_fdes_to_port.
	* fports.h (scm_fport): new struct.
	* fports.c (scm_open_file): use open, not fopen.
	#include fcntl.h
	* ports.h (struct scm_port_table): change stream from SCM to void *.
	* ports.c (scm_add_to_port_table): check for memory allocation error.
	(scm_prinport): remove MSDOS hair.
	(scm_void_port): set stream to 0 instead of SCM_BOOL_F.
	(scm_close_port): don't throw errors: do it in fports.c.