[bpt/guile.git] / libguile / ports.h

/* classes: h_files */

#ifndef PORTSH
#define PORTSH
/*	Copyright (C) 1995,1996,1997,1998,1999 Free Software Foundation, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 * As a special exception, the Free Software Foundation gives permission
 * for additional uses of the text contained in its release of GUILE.
 *
 * The exception is that, if you link the GUILE library with other files
 * to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the GUILE library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the
 * Free Software Foundation under the name GUILE.  If you copy
 * code from other Free Software Foundation releases into a copy of
 * GUILE, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for GUILE, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.  */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
\f
#include "libguile/__scm.h"

#include "libguile/print.h"
#include "libguile/struct.h"

/* Not sure if this is a good idea.  We need it for off_t.  */
#include <sys/types.h>

\f

#define SCM_INITIAL_PUTBACK_BUF_SIZE 4

/* values for the rw_active flag.  */
enum scm_port_rw_active {
  SCM_PORT_NEITHER = 0,
  SCM_PORT_READ = 1,
  SCM_PORT_WRITE = 2
};

/* C representation of a Scheme port.  */

typedef struct 
{
  SCM port;			/* Link back to the port object.  */
  int entry;			/* Index in port table. */
  int revealed;			/* 0 not revealed, > 1 revealed.
				 * Revealed ports do not get GC'd.
				 */
  /* data for the underlying port implementation.  may be an SCM cell or 
     cast to a pointer to C data.  */
  SCM stream;

  SCM file_name;		/* debugging support.  */
  int line_number;		/* debugging support.  */
  int column_number;		/* debugging support.  */

  /* port buffers.  the buffer(s) are set up for all ports.  
     in the case of string ports, the buffer is the string itself.
     in the case of unbuffered file ports, the buffer is a
     single char: shortbuf.  */

  /* this buffer is filled from read_buf to read_end using the ptob 
     buffer_fill.  then input requests are taken from read_pos until
     it reaches read_end.  */

  unsigned char *read_buf;	/* buffer start.  */
  const unsigned char *read_pos;/* the next unread char.  */
  unsigned char *read_end;      /* pointer to last buffered char + 1.  */
  off_t read_buf_size;		/* size of the buffer.  */

  /* when chars are put back into the buffer, e.g., using peek-char or
     unread-string, the read-buffer pointers are switched to cbuf.
     the original pointers are saved here and restored when the put-back
     chars have been consumed.  */
  unsigned char *saved_read_buf;
  const unsigned char *saved_read_pos;
  unsigned char *saved_read_end;
  off_t saved_read_buf_size;

  /* write requests are saved into this buffer at write_pos until it
     reaches write_buf + write_buf_size, then the ptob flush is
     called.  */

  unsigned char *write_buf;     /* buffer start.  */
  unsigned char *write_pos;     /* pointer to last buffered char + 1.  */
  unsigned char *write_end;     /* pointer to end of buffer + 1.  */
  off_t write_buf_size;		/* size of the buffer.  */

  unsigned char shortbuf;       /* buffer for "unbuffered" streams.  */

  int rw_random;                /* true if the port is random access.
				   implies that the buffers must be
				   flushed before switching between
				   reading and writing, seeking, etc.  */

  enum scm_port_rw_active rw_active; /* for random access ports,
					indicates which of the buffers
					is currently in use.  can be
					SCM_PORT_WRITE, SCM_PORT_READ,
					or SCM_PORT_NEITHER.  */


  /* a buffer for un-read chars and strings.  */
  unsigned char *putback_buf;
  int putback_buf_size;        /* allocated size of putback_buf.  */
} scm_port;

extern scm_port **scm_port_table;
extern int scm_port_table_size; /* Number of ports in scm_port_table.  */


\f

#define SCM_EOF_OBJECT_P(x) ((x) == SCM_EOF_VAL)

/* PORT FLAGS
 * A set of flags characterizes a port.
 * Note that we reserve the bits 1 << 24 and above for use by the
 * routines in the port's scm_ptobfuns structure.
 */
#define SCM_OPN		(1L<<16) /* Is the port open? */
#define SCM_RDNG	(2L<<16) /* Is it a readable port? */
#define SCM_WRTNG	(4L<<16) /* Is it writable? */
#define SCM_BUF0	(8L<<16) /* Is it unbuffered? */
/* #define SCM_CRDY	(32L<<16)  obsolete, for pushed back characters  */
#define SCM_BUFLINE     (64L<<16) /* Is it line-buffered? */

#define SCM_PORTP(x) (SCM_NIMP(x) && (SCM_TYP7(x)==scm_tc7_port))
#define SCM_OPPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_OPN) & SCM_CAR(x))==(scm_tc7_port | SCM_OPN)))
#define SCM_OPINPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_OPN | SCM_RDNG) & SCM_CAR(x))==(scm_tc7_port | SCM_OPN | SCM_RDNG)))
#define SCM_OPOUTPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_OPN | SCM_WRTNG) & SCM_CAR(x))==(scm_tc7_port | SCM_OPN | SCM_WRTNG)))
#define SCM_INPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_RDNG) & SCM_CAR(x))==(scm_tc7_port | SCM_RDNG)))
#define SCM_OUTPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_WRTNG) & SCM_CAR(x))==(scm_tc7_port | SCM_WRTNG)))
#define SCM_OPENP(x) (SCM_NIMP(x) && (SCM_OPN & SCM_CAR(x)))
#define SCM_CLOSEDP(x) (!SCM_OPENP(x))
#define SCM_PTAB_ENTRY(x) ((scm_port *) SCM_CDR(x))
#define SCM_SETPTAB_ENTRY(x,ent) SCM_SETCDR ((x), (SCM)(ent))
#define SCM_STREAM(x) SCM_PTAB_ENTRY(x)->stream
#define SCM_SETSTREAM(x,s) (SCM_PTAB_ENTRY(x)->stream = (SCM) s)
#define SCM_FILENAME(x) SCM_PTAB_ENTRY(x)->file_name
#define SCM_LINUM(x) SCM_PTAB_ENTRY(x)->line_number
#define SCM_COL(x) SCM_PTAB_ENTRY(x)->column_number
#define SCM_REVEALED(x) SCM_PTAB_ENTRY(x)->revealed
#define SCM_SETREVEALED(x,s) (SCM_PTAB_ENTRY(x)->revealed = s)

#define SCM_INCLINE(port)  	{SCM_LINUM (port) += 1; SCM_COL (port) = 0;}
#define SCM_INCCOL(port)  	{SCM_COL (port) += 1;}
#define SCM_TABCOL(port)  	{SCM_COL (port) += 8 - SCM_COL (port) % 8;}

\f

/* port-type description.  */
typedef struct scm_ptob_descriptor
{
  char *name;
  SCM (*mark) (SCM);
  scm_sizet (*free) (SCM);
  int (*print) (SCM exp, SCM port, scm_print_state *pstate);
  SCM (*equalp) (SCM, SCM);
  int (*close) (SCM port);

  void (*write) (SCM port, void *data, size_t size);
  void (*flush) (SCM port);

  void (*end_input) (SCM port, int offset);
  int (*fill_input) (SCM port);
  int (*input_waiting) (SCM port);

  off_t (*seek) (SCM port, off_t OFFSET, int WHENCE);
  void (*truncate) (SCM port, off_t length);

} scm_ptob_descriptor;

#define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
#define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CAR (x)))
/* SCM_PTOBNAME can be 0 if name is missing */
#define SCM_PTOBNAME(ptobnum) scm_ptobs[ptobnum].name

\f

extern scm_ptob_descriptor *scm_ptobs;
extern int scm_numptob;
extern int scm_port_table_room;

\f

extern SCM scm_markstream (SCM ptr);
extern long scm_make_port_type (char *name,
				int (*fill_input) (SCM port),
				void (*write) (SCM port, void *data,
					       size_t size));
extern void scm_set_port_mark (long tc, SCM (*mark) (SCM));
extern void scm_set_port_free (long tc, scm_sizet (*free) (SCM));
extern void scm_set_port_print (long tc,
				int (*print) (SCM exp,
					      SCM port,
					      scm_print_state *pstate));
extern void scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM));
extern void scm_set_port_close (long tc, int (*close) (SCM));

extern void scm_set_port_flush (long tc, 
				void (*flush) (SCM port));
extern void scm_set_port_end_input (long tc,
				    void (*end_input) (SCM port,
						       int offset));
extern void scm_set_port_seek (long tc,
			       off_t (*seek) (SCM port,
					      off_t OFFSET,
					      int WHENCE));
extern void scm_set_port_truncate (long tc,
				   void (*truncate) (SCM port,
						     off_t length));
extern void scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM));
extern SCM scm_char_ready_p (SCM port);
extern SCM scm_drain_input (SCM port);
extern SCM scm_current_input_port (void);
extern SCM scm_current_output_port (void);
extern SCM scm_current_error_port (void);
extern SCM scm_current_load_port (void);
extern SCM scm_set_current_input_port (SCM port);
extern SCM scm_set_current_output_port (SCM port);
extern SCM scm_set_current_error_port (SCM port);
extern scm_port * scm_add_to_port_table (SCM port);
extern void scm_remove_from_port_table (SCM port);
extern void scm_grow_port_cbuf (SCM port, size_t requested);
extern SCM scm_pt_size (void);
extern SCM scm_pt_member (SCM member);
extern int scm_revealed_count (SCM port);
extern SCM scm_port_revealed (SCM port);
extern SCM scm_set_port_revealed_x (SCM port, SCM rcount);
extern long scm_mode_bits (char *modes);
extern SCM scm_port_mode (SCM port);
extern SCM scm_close_port (SCM port);
extern SCM scm_close_all_ports_except (SCM ports);
extern SCM scm_input_port_p (SCM x);
extern SCM scm_output_port_p (SCM x);
extern SCM scm_port_closed_p (SCM port);
extern SCM scm_eof_object_p (SCM x);
extern SCM scm_force_output (SCM port);
extern SCM scm_flush_all_ports (void);
extern SCM scm_read_char (SCM port);
extern void scm_putc (char c, SCM port);
extern void scm_puts (const char *str_data, SCM port);
extern void scm_lfwrite (const char *ptr, scm_sizet size, SCM port);
extern void scm_flush (SCM port);
extern void scm_end_input (SCM port);
extern int scm_fill_input (SCM port);
extern int scm_getc (SCM port);
extern void scm_ungetc (int c, SCM port);
extern void scm_ungets (const char *s, int n, SCM port);
extern SCM scm_peek_char (SCM port);
extern SCM scm_unread_char (SCM cobj, SCM port);
extern SCM scm_unread_string (SCM str, SCM port);
extern char *scm_generic_fgets (SCM port, int *len);
extern SCM scm_seek (SCM object, SCM offset, SCM whence);
extern SCM scm_truncate_file (SCM object, SCM length);
extern SCM scm_port_line (SCM port);
extern SCM scm_set_port_line_x (SCM port, SCM line);
extern SCM scm_port_column (SCM port);
extern SCM scm_set_port_column_x (SCM port, SCM line);
extern SCM scm_port_filename (SCM port);
extern SCM scm_set_port_filename_x (SCM port, SCM filename);
extern int scm_port_print (SCM exp, SCM port, scm_print_state *);
extern void scm_print_port_mode (SCM exp, SCM port);
extern void scm_ports_prehistory (void);
extern SCM scm_void_port (char * mode_str);
extern SCM scm_sys_make_void_port (SCM mode);
extern void scm_init_ports (void);

#ifdef GUILE_DEBUG
extern SCM scm_pt_size (void);
extern SCM scm_pt_member (SCM member);
#endif /* GUILE_DEBUG */

#endif  /* PORTSH */
Commit	Line	Data
0f2d19dd JB	1	/* classes: h_files */
	2
	3	#ifndef PORTSH
	4	#define PORTSH
840ae05d	5	/* Copyright (C) 1995,1996,1997,1998,1999 Free Software Foundation, Inc.
0f2d19dd JB	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2, or (at your option)
	10	* any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this software; see the file COPYING. If not, write to
82892bed JB	19	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
82892bed JB	20	* Boston, MA 02111-1307 USA
0f2d19dd JB	21	*
	22	* As a special exception, the Free Software Foundation gives permission
	23	* for additional uses of the text contained in its release of GUILE.
	24	*
	25	* The exception is that, if you link the GUILE library with other files
	26	* to produce an executable, this does not by itself cause the
	27	* resulting executable to be covered by the GNU General Public License.
	28	* Your use of that executable is in no way restricted on account of
	29	* linking the GUILE library code into it.
	30	*
	31	* This exception does not however invalidate any other reasons why
	32	* the executable file might be covered by the GNU General Public License.
	33	*
	34	* This exception applies only to the code released by the
	35	* Free Software Foundation under the name GUILE. If you copy
	36	* code from other Free Software Foundation releases into a copy of
	37	* GUILE, as the General Public License permits, the exception does
	38	* not apply to the code that you add in this way. To avoid misleading
	39	* anyone as to the status of such modified files, you must delete
	40	* this exception notice from them.
	41	*
	42	* If you write modifications of your own for GUILE, it is your choice
	43	* whether to permit this exception to apply to your modifications.
82892bed	44	* If you do not wish that, delete this exception notice. */
d3a6bc94 GB	45
	46	/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
	47	gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
0f2d19dd	48	\f
b4309c3c	49	#include "libguile/__scm.h"
0f2d19dd	50
e0d86ad2	51	#include "libguile/print.h"
78446828	52	#include "libguile/struct.h"
e0d86ad2	53
acdb12da JB	54	/* Not sure if this is a good idea. We need it for off_t. */
	55	#include <sys/types.h>
	56
0f2d19dd JB	57	\f
0f2d19dd JB	58
6c951427	59	#define SCM_INITIAL_PUTBACK_BUF_SIZE 4
0855ef71	60
61e452ba JB	61	/* values for the rw_active flag. */
	62	enum scm_port_rw_active {
	63	SCM_PORT_NEITHER = 0,
	64	SCM_PORT_READ = 1,
	65	SCM_PORT_WRITE = 2
	66	};
	67
840ae05d JB	68	/* C representation of a Scheme port. */
	69
	70	typedef struct
0f2d19dd	71	{
ee149d03	72	SCM port; /* Link back to the port object. */
0855ef71	73	int entry; /* Index in port table. */
0f2d19dd JB	74	int revealed; /* 0 not revealed, > 1 revealed.
	75	* Revealed ports do not get GC'd.
	76	*/
840ae05d JB	77	/* data for the underlying port implementation. may be an SCM cell or
840ae05d JB	78	cast to a pointer to C data. */
0f2d19dd	79	SCM stream;
0f2d19dd	80
0855ef71	81	SCM file_name; /* debugging support. */
ebf7394e GH	82	int line_number; /* debugging support. */
ebf7394e GH	83	int column_number; /* debugging support. */
0855ef71	84
ee149d03 JB	85	/* port buffers. the buffer(s) are set up for all ports.
	86	in the case of string ports, the buffer is the string itself.
	87	in the case of unbuffered file ports, the buffer is a
	88	single char: shortbuf. */
	89
	90	/* this buffer is filled from read_buf to read_end using the ptob
	91	buffer_fill. then input requests are taken from read_pos until
	92	it reaches read_end. */
	93
	94	unsigned char read_buf; / buffer start. */
840ae05d	95	const unsigned char read_pos;/ the next unread char. */
ee149d03	96	unsigned char read_end; / pointer to last buffered char + 1. */
840ae05d	97	off_t read_buf_size; /* size of the buffer. */
ee149d03	98
6c951427 GH	99	/* when chars are put back into the buffer, e.g., using peek-char or
	100	unread-string, the read-buffer pointers are switched to cbuf.
	101	the original pointers are saved here and restored when the put-back
	102	chars have been consumed. */
	103	unsigned char *saved_read_buf;
	104	const unsigned char *saved_read_pos;
	105	unsigned char *saved_read_end;
	106	off_t saved_read_buf_size;
	107
ee149d03 JB	108	/* write requests are saved into this buffer at write_pos until it
	109	reaches write_buf + write_buf_size, then the ptob flush is
	110	called. */
	111
6c951427	112	unsigned char write_buf; / buffer start. */
ee149d03 JB	113	unsigned char write_pos; / pointer to last buffered char + 1. */
ee149d03 JB	114	unsigned char write_end; / pointer to end of buffer + 1. */
840ae05d	115	off_t write_buf_size; /* size of the buffer. */
ee149d03 JB	116
	117	unsigned char shortbuf; /* buffer for "unbuffered" streams. */
	118
0de97b83 GH	119	int rw_random; /* true if the port is random access.
	120	implies that the buffers must be
	121	flushed before switching between
	122	reading and writing, seeking, etc. */
	123
	124	enum scm_port_rw_active rw_active; /* for random access ports,
	125	indicates which of the buffers
	126	is currently in use. can be
	127	SCM_PORT_WRITE, SCM_PORT_READ,
	128	or SCM_PORT_NEITHER. */
ee149d03	129
61e452ba	130
6c951427 GH	131	/* a buffer for un-read chars and strings. */
	132	unsigned char *putback_buf;
	133	int putback_buf_size; /* allocated size of putback_buf. */
840ae05d JB	134	} scm_port;
840ae05d JB	135
840ae05d	136	extern scm_port **scm_port_table;
0f82baf6	137	extern int scm_port_table_size; /* Number of ports in scm_port_table. */
0f2d19dd JB	138
	139
	140	\f
	141
0c32d76c MD	142	#define SCM_EOF_OBJECT_P(x) ((x) == SCM_EOF_VAL)
0c32d76c MD	143
0f2d19dd	144	/* PORT FLAGS
dbece3a2	145	* A set of flags characterizes a port.
571031dc JB	146	* Note that we reserve the bits 1 << 24 and above for use by the
571031dc JB	147	* routines in the port's scm_ptobfuns structure.
0f2d19dd JB	148	*/
	149	#define SCM_OPN (1L<<16) /* Is the port open? */
	150	#define SCM_RDNG (2L<<16) /* Is it a readable port? */
	151	#define SCM_WRTNG (4L<<16) /* Is it writable? */
ee149d03	152	#define SCM_BUF0 (8L<<16) /* Is it unbuffered? */
6c951427	153	/* #define SCM_CRDY (32L<<16) obsolete, for pushed back characters */
ee149d03	154	#define SCM_BUFLINE (64L<<16) /* Is it line-buffered? */
0f2d19dd	155
d3a6bc94 GB	156	#define SCM_PORTP(x) (SCM_NIMP(x) && (SCM_TYP7(x)==scm_tc7_port))
	157	#define SCM_OPPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN) & SCM_CAR(x))==(scm_tc7_port \| SCM_OPN)))
	158	#define SCM_OPINPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN \| SCM_RDNG) & SCM_CAR(x))==(scm_tc7_port \| SCM_OPN \| SCM_RDNG)))
	159	#define SCM_OPOUTPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN \| SCM_WRTNG) & SCM_CAR(x))==(scm_tc7_port \| SCM_OPN \| SCM_WRTNG)))
	160	#define SCM_INPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_RDNG) & SCM_CAR(x))==(scm_tc7_port \| SCM_RDNG)))
	161	#define SCM_OUTPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_WRTNG) & SCM_CAR(x))==(scm_tc7_port \| SCM_WRTNG)))
	162	#define SCM_OPENP(x) (SCM_NIMP(x) && (SCM_OPN & SCM_CAR(x)))
0f2d19dd	163	#define SCM_CLOSEDP(x) (!SCM_OPENP(x))
840ae05d	164	#define SCM_PTAB_ENTRY(x) ((scm_port *) SCM_CDR(x))
0f2d19dd JB	165	#define SCM_SETPTAB_ENTRY(x,ent) SCM_SETCDR ((x), (SCM)(ent))
0f2d19dd JB	166	#define SCM_STREAM(x) SCM_PTAB_ENTRY(x)->stream
ee149d03	167	#define SCM_SETSTREAM(x,s) (SCM_PTAB_ENTRY(x)->stream = (SCM) s)
d14af9f2	168	#define SCM_FILENAME(x) SCM_PTAB_ENTRY(x)->file_name
0f2d19dd JB	169	#define SCM_LINUM(x) SCM_PTAB_ENTRY(x)->line_number
	170	#define SCM_COL(x) SCM_PTAB_ENTRY(x)->column_number
	171	#define SCM_REVEALED(x) SCM_PTAB_ENTRY(x)->revealed
	172	#define SCM_SETREVEALED(x,s) (SCM_PTAB_ENTRY(x)->revealed = s)
0f2d19dd JB	173
	174	#define SCM_INCLINE(port) {SCM_LINUM (port) += 1; SCM_COL (port) = 0;}
	175	#define SCM_INCCOL(port) {SCM_COL (port) += 1;}
d14af9f2	176	#define SCM_TABCOL(port) {SCM_COL (port) += 8 - SCM_COL (port) % 8;}
0f2d19dd	177
0f2d19dd JB	178	\f
0f2d19dd JB	179
affc96b5	180	/* port-type description. */
f12733c9	181	typedef struct scm_ptob_descriptor
0f82baf6	182	{
f12733c9	183	char *name;
0c0669cc	184	SCM (*mark) (SCM);
f12733c9	185	scm_sizet (*free) (SCM);
0c0669cc JB	186	int (print) (SCM exp, SCM port, scm_print_state pstate);
0c0669cc JB	187	SCM (*equalp) (SCM, SCM);
affc96b5 GH	188	int (*close) (SCM port);
affc96b5 GH	189
31703ab8	190	void (write) (SCM port, void data, size_t size);
affc96b5 GH	191	void (*flush) (SCM port);
	192
	193	void (*end_input) (SCM port, int offset);
	194	int (*fill_input) (SCM port);
	195	int (*input_waiting) (SCM port);
	196
ee149d03	197	off_t (*seek) (SCM port, off_t OFFSET, int WHENCE);
affc96b5 GH	198	void (*truncate) (SCM port, off_t length);
affc96b5 GH	199
f12733c9	200	} scm_ptob_descriptor;
0f82baf6	201
f12733c9 MD	202	#define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
	203	#define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CAR (x)))
	204	/* SCM_PTOBNAME can be 0 if name is missing */
	205	#define SCM_PTOBNAME(ptobnum) scm_ptobs[ptobnum].name
0f82baf6 JB	206
	207	\f
	208
f12733c9	209	extern scm_ptob_descriptor *scm_ptobs;
a1c95c45	210	extern int scm_numptob;
0f2d19dd JB	211	extern int scm_port_table_room;
	212
	213	\f
0f2d19dd	214
60d0643d	215	extern SCM scm_markstream (SCM ptr);
f12733c9	216	extern long scm_make_port_type (char *name,
affc96b5 GH	217	int (*fill_input) (SCM port),
	218	void (write) (SCM port, void data,
	219	size_t size));
6c747373 MD	220	extern void scm_set_port_mark (long tc, SCM (*mark) (SCM));
	221	extern void scm_set_port_free (long tc, scm_sizet (*free) (SCM));
	222	extern void scm_set_port_print (long tc,
f12733c9 MD	223	int (*print) (SCM exp,
	224	SCM port,
	225	scm_print_state *pstate));
6c747373	226	extern void scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM));
6c747373	227	extern void scm_set_port_close (long tc, int (*close) (SCM));
affc96b5 GH	228
	229	extern void scm_set_port_flush (long tc,
	230	void (*flush) (SCM port));
	231	extern void scm_set_port_end_input (long tc,
	232	void (*end_input) (SCM port,
	233	int offset));
6c747373	234	extern void scm_set_port_seek (long tc,
f12733c9 MD	235	off_t (*seek) (SCM port,
	236	off_t OFFSET,
	237	int WHENCE));
6c747373	238	extern void scm_set_port_truncate (long tc,
f12733c9 MD	239	void (*truncate) (SCM port,
f12733c9 MD	240	off_t length));
affc96b5	241	extern void scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM));
60d0643d	242	extern SCM scm_char_ready_p (SCM port);
ee149d03	243	extern SCM scm_drain_input (SCM port);
60d0643d GH	244	extern SCM scm_current_input_port (void);
	245	extern SCM scm_current_output_port (void);
	246	extern SCM scm_current_error_port (void);
	247	extern SCM scm_current_load_port (void);
	248	extern SCM scm_set_current_input_port (SCM port);
	249	extern SCM scm_set_current_output_port (SCM port);
	250	extern SCM scm_set_current_error_port (SCM port);
	251	extern scm_port * scm_add_to_port_table (SCM port);
	252	extern void scm_remove_from_port_table (SCM port);
	253	extern void scm_grow_port_cbuf (SCM port, size_t requested);
	254	extern SCM scm_pt_size (void);
	255	extern SCM scm_pt_member (SCM member);
	256	extern int scm_revealed_count (SCM port);
	257	extern SCM scm_port_revealed (SCM port);
	258	extern SCM scm_set_port_revealed_x (SCM port, SCM rcount);
	259	extern long scm_mode_bits (char *modes);
	260	extern SCM scm_port_mode (SCM port);
	261	extern SCM scm_close_port (SCM port);
	262	extern SCM scm_close_all_ports_except (SCM ports);
	263	extern SCM scm_input_port_p (SCM x);
	264	extern SCM scm_output_port_p (SCM x);
	265	extern SCM scm_port_closed_p (SCM port);
	266	extern SCM scm_eof_object_p (SCM x);
	267	extern SCM scm_force_output (SCM port);
	268	extern SCM scm_flush_all_ports (void);
	269	extern SCM scm_read_char (SCM port);
	270	extern void scm_putc (char c, SCM port);
70d63753 GB	271	extern void scm_puts (const char *str_data, SCM port);
70d63753 GB	272	extern void scm_lfwrite (const char *ptr, scm_sizet size, SCM port);
60d0643d	273	extern void scm_flush (SCM port);
affc96b5 GH	274	extern void scm_end_input (SCM port);
affc96b5 GH	275	extern int scm_fill_input (SCM port);
60d0643d GH	276	extern int scm_getc (SCM port);
60d0643d GH	277	extern void scm_ungetc (int c, SCM port);
70d63753	278	extern void scm_ungets (const char *s, int n, SCM port);
60d0643d GH	279	extern SCM scm_peek_char (SCM port);
	280	extern SCM scm_unread_char (SCM cobj, SCM port);
	281	extern SCM scm_unread_string (SCM str, SCM port);
	282	extern char scm_generic_fgets (SCM port, int len);
9cd4dfbb	283	extern SCM scm_seek (SCM object, SCM offset, SCM whence);
69bc9ff3	284	extern SCM scm_truncate_file (SCM object, SCM length);
60d0643d GH	285	extern SCM scm_port_line (SCM port);
	286	extern SCM scm_set_port_line_x (SCM port, SCM line);
	287	extern SCM scm_port_column (SCM port);
	288	extern SCM scm_set_port_column_x (SCM port, SCM line);
	289	extern SCM scm_port_filename (SCM port);
	290	extern SCM scm_set_port_filename_x (SCM port, SCM filename);
f12733c9 MD	291	extern int scm_port_print (SCM exp, SCM port, scm_print_state *);
f12733c9 MD	292	extern void scm_print_port_mode (SCM exp, SCM port);
60d0643d GH	293	extern void scm_ports_prehistory (void);
	294	extern SCM scm_void_port (char * mode_str);
	295	extern SCM scm_sys_make_void_port (SCM mode);
	296	extern void scm_init_ports (void);
0f2d19dd	297
f3667f52	298	#ifdef GUILE_DEBUG
60d0643d GH	299	extern SCM scm_pt_size (void);
60d0643d GH	300	extern SCM scm_pt_member (SCM member);
be1cd096	301	#endif /* GUILE_DEBUG */
f3667f52	302
0f2d19dd	303	#endif /* PORTSH */