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

/* classes: h_files */

#ifndef PORTSH
#define PORTSH
/*	Copyright (C) 1995,1996,1997,1998,1999, 2000 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 as a raw C value. */
  scm_bits_t 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) (SCM_EQ_P ((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_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_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN)))
#define SCM_OPINPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_OPN | SCM_RDNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN | SCM_RDNG)))
#define SCM_OPOUTPORTP(x) (SCM_NIMP(x) && (((0x7f | SCM_OPN | SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN | SCM_WRTNG)))
#define SCM_INPUT_PORT_P(x) \
  (SCM_NIMP(x) \
   && (((0x7f | SCM_RDNG) & SCM_CELL_WORD_0(x)) == (scm_tc7_port | SCM_RDNG)))
#define SCM_OUTPUT_PORT_P(x) \
  (SCM_NIMP(x) \
   && (((0x7f | SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_WRTNG)))
#define SCM_OPENP(x) (SCM_NIMP(x) && (SCM_OPN & SCM_CELL_WORD_0 (x)))
#define SCM_CLOSEDP(x) (!SCM_OPENP(x))

#define SCM_PTAB_ENTRY(x)         ((scm_port *) SCM_CELL_WORD_1 (x))
#define SCM_SETPTAB_ENTRY(x,ent)  (SCM_SET_CELL_WORD_1 ((x), (scm_bits_t) (ent)))
#define SCM_STREAM(x)             (SCM_PTAB_ENTRY(x)->stream)
#define SCM_SETSTREAM(x,s)        (SCM_PTAB_ENTRY(x)->stream = (scm_bits_t) (s))
#define SCM_FILENAME(x)           (SCM_PTAB_ENTRY(x)->file_name)
#define SCM_SET_FILENAME(x, n)    (SCM_PTAB_ENTRY(x)->file_name = (n))
#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, const 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_CELL_TYPE (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, const 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 void scm_port_non_buffer (scm_port *pt);
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_input_port (SCM port);
extern SCM scm_close_output_port (SCM port);
extern SCM scm_close_port (SCM port);
extern SCM scm_port_for_each (SCM proc);
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_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 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 */

\f

#if (SCM_DEBUG_DEPRECATED == 0)

/* #define SCM_CRDY	(32L<<16)  obsolete, for pushed back characters  */
#define SCM_INPORTP(x) SCM_INPUT_PORT_P (x)
#define SCM_OUTPORTP(x) SCM_OUTPUT_PORT_P (x)

#endif  /* SCM_DEBUG_DEPRECATED == 0 */

#endif  /* PORTSH */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
Commit	Line	Data
0f2d19dd JB	1	/* classes: h_files */
	2
	3	#ifndef PORTSH
	4	#define PORTSH
df97587f	5	/* Copyright (C) 1995,1996,1997,1998,1999, 2000 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	*/
74a16888 DH	77	/* data for the underlying port implementation as a raw C value. */
74a16888 DH	78	scm_bits_t stream;
0f2d19dd	79
0855ef71	80	SCM file_name; /* debugging support. */
ebf7394e GH	81	int line_number; /* debugging support. */
ebf7394e GH	82	int column_number; /* debugging support. */
0855ef71	83
ee149d03 JB	84	/* port buffers. the buffer(s) are set up for all ports.
	85	in the case of string ports, the buffer is the string itself.
	86	in the case of unbuffered file ports, the buffer is a
	87	single char: shortbuf. */
	88
	89	/* this buffer is filled from read_buf to read_end using the ptob
	90	buffer_fill. then input requests are taken from read_pos until
	91	it reaches read_end. */
	92
	93	unsigned char read_buf; / buffer start. */
840ae05d	94	const unsigned char read_pos;/ the next unread char. */
ee149d03	95	unsigned char read_end; / pointer to last buffered char + 1. */
840ae05d	96	off_t read_buf_size; /* size of the buffer. */
ee149d03	97
6c951427 GH	98	/* when chars are put back into the buffer, e.g., using peek-char or
	99	unread-string, the read-buffer pointers are switched to cbuf.
	100	the original pointers are saved here and restored when the put-back
	101	chars have been consumed. */
	102	unsigned char *saved_read_buf;
	103	const unsigned char *saved_read_pos;
	104	unsigned char *saved_read_end;
	105	off_t saved_read_buf_size;
	106
ee149d03 JB	107	/* write requests are saved into this buffer at write_pos until it
	108	reaches write_buf + write_buf_size, then the ptob flush is
	109	called. */
	110
6c951427	111	unsigned char write_buf; / buffer start. */
ee149d03 JB	112	unsigned char write_pos; / pointer to last buffered char + 1. */
ee149d03 JB	113	unsigned char write_end; / pointer to end of buffer + 1. */
840ae05d	114	off_t write_buf_size; /* size of the buffer. */
ee149d03 JB	115
	116	unsigned char shortbuf; /* buffer for "unbuffered" streams. */
	117
0de97b83 GH	118	int rw_random; /* true if the port is random access.
	119	implies that the buffers must be
	120	flushed before switching between
	121	reading and writing, seeking, etc. */
	122
	123	enum scm_port_rw_active rw_active; /* for random access ports,
	124	indicates which of the buffers
	125	is currently in use. can be
	126	SCM_PORT_WRITE, SCM_PORT_READ,
	127	or SCM_PORT_NEITHER. */
ee149d03	128
61e452ba	129
6c951427 GH	130	/* a buffer for un-read chars and strings. */
	131	unsigned char *putback_buf;
	132	int putback_buf_size; /* allocated size of putback_buf. */
840ae05d JB	133	} scm_port;
840ae05d JB	134
840ae05d	135	extern scm_port **scm_port_table;
0f82baf6	136	extern int scm_port_table_size; /* Number of ports in scm_port_table. */
0f2d19dd JB	137
	138
	139	\f
	140
54778cd3	141	#define SCM_EOF_OBJECT_P(x) (SCM_EQ_P ((x), SCM_EOF_VAL))
0c32d76c	142
0f2d19dd	143	/* PORT FLAGS
dbece3a2	144	* A set of flags characterizes a port.
571031dc JB	145	* Note that we reserve the bits 1 << 24 and above for use by the
571031dc JB	146	* routines in the port's scm_ptobfuns structure.
0f2d19dd JB	147	*/
	148	#define SCM_OPN (1L<<16) /* Is the port open? */
	149	#define SCM_RDNG (2L<<16) /* Is it a readable port? */
	150	#define SCM_WRTNG (4L<<16) /* Is it writable? */
ee149d03	151	#define SCM_BUF0 (8L<<16) /* Is it unbuffered? */
ee149d03	152	#define SCM_BUFLINE (64L<<16) /* Is it line-buffered? */
0f2d19dd	153
d3a6bc94	154	#define SCM_PORTP(x) (SCM_NIMP(x) && (SCM_TYP7(x)==scm_tc7_port))
f9a64404 DH	155	#define SCM_OPPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN) & SCM_CELL_WORD_0(x))==(scm_tc7_port \| SCM_OPN)))
	156	#define SCM_OPINPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN \| SCM_RDNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port \| SCM_OPN \| SCM_RDNG)))
	157	#define SCM_OPOUTPORTP(x) (SCM_NIMP(x) && (((0x7f \| SCM_OPN \| SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port \| SCM_OPN \| SCM_WRTNG)))
df97587f MD	158	#define SCM_INPUT_PORT_P(x) \
df97587f MD	159	(SCM_NIMP(x) \
f9a64404	160	&& (((0x7f \| SCM_RDNG) & SCM_CELL_WORD_0(x)) == (scm_tc7_port \| SCM_RDNG)))
df97587f MD	161	#define SCM_OUTPUT_PORT_P(x) \
df97587f MD	162	(SCM_NIMP(x) \
f9a64404 DH	163	&& (((0x7f \| SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port \| SCM_WRTNG)))
f9a64404 DH	164	#define SCM_OPENP(x) (SCM_NIMP(x) && (SCM_OPN & SCM_CELL_WORD_0 (x)))
0f2d19dd	165	#define SCM_CLOSEDP(x) (!SCM_OPENP(x))
843524cc DH	166
843524cc DH	167	#define SCM_PTAB_ENTRY(x) ((scm_port *) SCM_CELL_WORD_1 (x))
74a16888	168	#define SCM_SETPTAB_ENTRY(x,ent) (SCM_SET_CELL_WORD_1 ((x), (scm_bits_t) (ent)))
843524cc	169	#define SCM_STREAM(x) (SCM_PTAB_ENTRY(x)->stream)
74a16888	170	#define SCM_SETSTREAM(x,s) (SCM_PTAB_ENTRY(x)->stream = (scm_bits_t) (s))
843524cc	171	#define SCM_FILENAME(x) (SCM_PTAB_ENTRY(x)->file_name)
b24b5e13	172	#define SCM_SET_FILENAME(x, n) (SCM_PTAB_ENTRY(x)->file_name = (n))
843524cc DH	173	#define SCM_LINUM(x) (SCM_PTAB_ENTRY(x)->line_number)
	174	#define SCM_COL(x) (SCM_PTAB_ENTRY(x)->column_number)
	175	#define SCM_REVEALED(x) (SCM_PTAB_ENTRY(x)->revealed)
	176	#define SCM_SETREVEALED(x,s) (SCM_PTAB_ENTRY(x)->revealed = (s))
0f2d19dd JB	177
	178	#define SCM_INCLINE(port) {SCM_LINUM (port) += 1; SCM_COL (port) = 0;}
	179	#define SCM_INCCOL(port) {SCM_COL (port) += 1;}
d14af9f2	180	#define SCM_TABCOL(port) {SCM_COL (port) += 8 - SCM_COL (port) % 8;}
0f2d19dd	181
0f2d19dd JB	182	\f
0f2d19dd JB	183
affc96b5	184	/* port-type description. */
f12733c9	185	typedef struct scm_ptob_descriptor
0f82baf6	186	{
f12733c9	187	char *name;
0c0669cc	188	SCM (*mark) (SCM);
f12733c9	189	scm_sizet (*free) (SCM);
0c0669cc JB	190	int (print) (SCM exp, SCM port, scm_print_state pstate);
0c0669cc JB	191	SCM (*equalp) (SCM, SCM);
affc96b5 GH	192	int (*close) (SCM port);
affc96b5 GH	193
8aa011a1	194	void (write) (SCM port, const void data, size_t size);
affc96b5 GH	195	void (*flush) (SCM port);
	196
	197	void (*end_input) (SCM port, int offset);
	198	int (*fill_input) (SCM port);
	199	int (*input_waiting) (SCM port);
	200
ee149d03	201	off_t (*seek) (SCM port, off_t OFFSET, int WHENCE);
affc96b5 GH	202	void (*truncate) (SCM port, off_t length);
affc96b5 GH	203
f12733c9	204	} scm_ptob_descriptor;
0f82baf6	205
12a8b769 DH	206	#define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
12a8b769 DH	207	#define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CELL_TYPE (x)))
f12733c9 MD	208	/* SCM_PTOBNAME can be 0 if name is missing */
f12733c9 MD	209	#define SCM_PTOBNAME(ptobnum) scm_ptobs[ptobnum].name
0f82baf6 JB	210
	211	\f
	212
f12733c9	213	extern scm_ptob_descriptor *scm_ptobs;
a1c95c45	214	extern int scm_numptob;
0f2d19dd JB	215	extern int scm_port_table_room;
	216
	217	\f
0f2d19dd	218
60d0643d	219	extern SCM scm_markstream (SCM ptr);
f12733c9	220	extern long scm_make_port_type (char *name,
affc96b5	221	int (*fill_input) (SCM port),
8aa011a1	222	void (write) (SCM port, const void data,
affc96b5	223	size_t size));
6c747373 MD	224	extern void scm_set_port_mark (long tc, SCM (*mark) (SCM));
	225	extern void scm_set_port_free (long tc, scm_sizet (*free) (SCM));
	226	extern void scm_set_port_print (long tc,
f12733c9 MD	227	int (*print) (SCM exp,
	228	SCM port,
	229	scm_print_state *pstate));
6c747373	230	extern void scm_set_port_equalp (long tc, SCM (*equalp) (SCM, SCM));
6c747373	231	extern void scm_set_port_close (long tc, int (*close) (SCM));
affc96b5 GH	232
	233	extern void scm_set_port_flush (long tc,
	234	void (*flush) (SCM port));
	235	extern void scm_set_port_end_input (long tc,
	236	void (*end_input) (SCM port,
	237	int offset));
6c747373	238	extern void scm_set_port_seek (long tc,
f12733c9 MD	239	off_t (*seek) (SCM port,
	240	off_t OFFSET,
	241	int WHENCE));
6c747373	242	extern void scm_set_port_truncate (long tc,
f12733c9 MD	243	void (*truncate) (SCM port,
f12733c9 MD	244	off_t length));
affc96b5	245	extern void scm_set_port_input_waiting (long tc, int (*input_waiting) (SCM));
60d0643d	246	extern SCM scm_char_ready_p (SCM port);
ee149d03	247	extern SCM scm_drain_input (SCM port);
60d0643d GH	248	extern SCM scm_current_input_port (void);
	249	extern SCM scm_current_output_port (void);
	250	extern SCM scm_current_error_port (void);
	251	extern SCM scm_current_load_port (void);
	252	extern SCM scm_set_current_input_port (SCM port);
	253	extern SCM scm_set_current_output_port (SCM port);
	254	extern SCM scm_set_current_error_port (SCM port);
	255	extern scm_port * scm_add_to_port_table (SCM port);
	256	extern void scm_remove_from_port_table (SCM port);
	257	extern void scm_grow_port_cbuf (SCM port, size_t requested);
	258	extern SCM scm_pt_size (void);
	259	extern SCM scm_pt_member (SCM member);
70df8af6	260	extern void scm_port_non_buffer (scm_port *pt);
60d0643d GH	261	extern int scm_revealed_count (SCM port);
	262	extern SCM scm_port_revealed (SCM port);
	263	extern SCM scm_set_port_revealed_x (SCM port, SCM rcount);
	264	extern long scm_mode_bits (char *modes);
	265	extern SCM scm_port_mode (SCM port);
df97587f MD	266	extern SCM scm_close_input_port (SCM port);
df97587f MD	267	extern SCM scm_close_output_port (SCM port);
60d0643d	268	extern SCM scm_close_port (SCM port);
c2ca4493	269	extern SCM scm_port_for_each (SCM proc);
60d0643d GH	270	extern SCM scm_close_all_ports_except (SCM ports);
	271	extern SCM scm_input_port_p (SCM x);
	272	extern SCM scm_output_port_p (SCM x);
eb5c0a2a	273	extern SCM scm_port_p (SCM x);
60d0643d GH	274	extern SCM scm_port_closed_p (SCM port);
	275	extern SCM scm_eof_object_p (SCM x);
	276	extern SCM scm_force_output (SCM port);
	277	extern SCM scm_flush_all_ports (void);
	278	extern SCM scm_read_char (SCM port);
	279	extern void scm_putc (char c, SCM port);
70d63753 GB	280	extern void scm_puts (const char *str_data, SCM port);
70d63753 GB	281	extern void scm_lfwrite (const char *ptr, scm_sizet size, SCM port);
60d0643d	282	extern void scm_flush (SCM port);
affc96b5 GH	283	extern void scm_end_input (SCM port);
affc96b5 GH	284	extern int scm_fill_input (SCM port);
60d0643d GH	285	extern int scm_getc (SCM port);
60d0643d GH	286	extern void scm_ungetc (int c, SCM port);
70d63753	287	extern void scm_ungets (const char *s, int n, SCM port);
60d0643d GH	288	extern SCM scm_peek_char (SCM port);
	289	extern SCM scm_unread_char (SCM cobj, SCM port);
	290	extern SCM scm_unread_string (SCM str, SCM port);
9cd4dfbb	291	extern SCM scm_seek (SCM object, SCM offset, SCM whence);
69bc9ff3	292	extern SCM scm_truncate_file (SCM object, SCM length);
60d0643d GH	293	extern SCM scm_port_line (SCM port);
	294	extern SCM scm_set_port_line_x (SCM port, SCM line);
	295	extern SCM scm_port_column (SCM port);
	296	extern SCM scm_set_port_column_x (SCM port, SCM line);
	297	extern SCM scm_port_filename (SCM port);
	298	extern SCM scm_set_port_filename_x (SCM port, SCM filename);
f12733c9 MD	299	extern int scm_port_print (SCM exp, SCM port, scm_print_state *);
f12733c9 MD	300	extern void scm_print_port_mode (SCM exp, SCM port);
60d0643d GH	301	extern void scm_ports_prehistory (void);
	302	extern SCM scm_void_port (char * mode_str);
	303	extern SCM scm_sys_make_void_port (SCM mode);
	304	extern void scm_init_ports (void);
0f2d19dd	305
f3667f52	306	#ifdef GUILE_DEBUG
60d0643d GH	307	extern SCM scm_pt_size (void);
60d0643d GH	308	extern SCM scm_pt_member (SCM member);
be1cd096	309	#endif /* GUILE_DEBUG */
f3667f52	310
f5f2dcff DH	311	\f
	312
	313	#if (SCM_DEBUG_DEPRECATED == 0)
	314
	315	/* #define SCM_CRDY (32L<<16) obsolete, for pushed back characters */
	316	#define SCM_INPORTP(x) SCM_INPUT_PORT_P (x)
	317	#define SCM_OUTPORTP(x) SCM_OUTPUT_PORT_P (x)
	318
	319	#endif /* SCM_DEBUG_DEPRECATED == 0 */
	320
0f2d19dd	321	#endif /* PORTSH */
89e00824 ML	322
	323	/*
	324	Local Variables:
	325	c-file-style: "gnu"
	326	End:
	327	*/