6 /* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004,
7 * 2006, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public License
11 * as published by the Free Software Foundation; either version 3 of
12 * the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
27 #include "libguile/__scm.h"
30 #include "libguile/print.h"
31 #include "libguile/struct.h"
32 #include "libguile/threads.h"
33 #include "libguile/strings.h"
37 #define SCM_INITIAL_PUTBACK_BUF_SIZE 4
39 /* values for the rw_active flag. */
40 typedef enum scm_t_port_rw_active
{
44 } scm_t_port_rw_active
;
46 /* C representation of a Scheme port. */
50 SCM port
; /* Link back to the port object. */
51 int revealed
; /* 0 not revealed, > 1 revealed.
52 * Revealed ports do not get GC'd.
54 /* data for the underlying port implementation as a raw C value. */
57 SCM file_name
; /* debugging support. */
58 long line_number
; /* debugging support. */
59 int column_number
; /* debugging support. */
61 /* Character encoding support */
63 scm_t_string_failed_conversion_handler ilseq_handler
;
65 /* port buffers. the buffer(s) are set up for all ports.
66 in the case of string ports, the buffer is the string itself.
67 in the case of unbuffered file ports, the buffer is a
68 single char: shortbuf. */
70 /* this buffer is filled from read_buf to read_end using the ptob
71 buffer_fill. then input requests are taken from read_pos until
72 it reaches read_end. */
74 unsigned char *read_buf
; /* buffer start. */
75 const unsigned char *read_pos
;/* the next unread char. */
76 unsigned char *read_end
; /* pointer to last buffered char + 1. */
77 scm_t_off read_buf_size
; /* size of the buffer. */
79 /* when chars are put back into the buffer, e.g., using peek-char or
80 unread-string, the read-buffer pointers are switched to cbuf.
81 the original pointers are saved here and restored when the put-back
82 chars have been consumed. */
83 unsigned char *saved_read_buf
;
84 const unsigned char *saved_read_pos
;
85 unsigned char *saved_read_end
;
86 scm_t_off saved_read_buf_size
;
88 /* write requests are saved into this buffer at write_pos until it
89 reaches write_buf + write_buf_size, then the ptob flush is
92 unsigned char *write_buf
; /* buffer start. */
93 unsigned char *write_pos
; /* pointer to last buffered char + 1. */
94 unsigned char *write_end
; /* pointer to end of buffer + 1. */
95 scm_t_off write_buf_size
; /* size of the buffer. */
97 unsigned char shortbuf
; /* buffer for "unbuffered" streams. */
99 int rw_random
; /* true if the port is random access.
100 implies that the buffers must be
101 flushed before switching between
102 reading and writing, seeking, etc. */
104 scm_t_port_rw_active rw_active
; /* for random access ports,
105 indicates which of the buffers
106 is currently in use. can be
107 SCM_PORT_WRITE, SCM_PORT_READ,
108 or SCM_PORT_NEITHER. */
111 /* a buffer for un-read chars and strings. */
112 unsigned char *putback_buf
;
113 size_t putback_buf_size
; /* allocated size of putback_buf. */
115 /* input/output iconv conversion descriptors */
121 SCM_INTERNAL scm_i_pthread_mutex_t scm_i_port_table_mutex
;
122 SCM_INTERNAL SCM scm_i_port_weak_hash
;
125 #define SCM_READ_BUFFER_EMPTY_P(c_port) (c_port->read_pos >= c_port->read_end)
129 #define SCM_EOF_OBJECT_P(x) (scm_is_eq ((x), SCM_EOF_VAL))
132 * A set of flags characterizes a port.
133 * Note that we reserve the bits 1 << 24 and above for use by the
134 * routines in the port's scm_ptobfuns structure.
136 #define SCM_OPN (1L<<16) /* Is the port open? */
137 #define SCM_RDNG (2L<<16) /* Is it a readable port? */
138 #define SCM_WRTNG (4L<<16) /* Is it writable? */
139 #define SCM_BUF0 (8L<<16) /* Is it unbuffered? */
140 #define SCM_BUFLINE (64L<<16) /* Is it line-buffered? */
142 #define SCM_PORTP(x) (!SCM_IMP (x) && (SCM_TYP7 (x) == scm_tc7_port))
143 #define SCM_OPPORTP(x) (!SCM_IMP(x) && (((0x7f | SCM_OPN) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN)))
144 #define SCM_OPINPORTP(x) (!SCM_IMP(x) && (((0x7f | SCM_OPN | SCM_RDNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN | SCM_RDNG)))
145 #define SCM_OPOUTPORTP(x) (!SCM_IMP(x) && (((0x7f | SCM_OPN | SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_OPN | SCM_WRTNG)))
146 #define SCM_INPUT_PORT_P(x) \
148 && (((0x7f | SCM_RDNG) & SCM_CELL_WORD_0(x)) == (scm_tc7_port | SCM_RDNG)))
149 #define SCM_OUTPUT_PORT_P(x) \
151 && (((0x7f | SCM_WRTNG) & SCM_CELL_WORD_0(x))==(scm_tc7_port | SCM_WRTNG)))
152 #define SCM_OPENP(x) (!SCM_IMP(x) && (SCM_OPN & SCM_CELL_WORD_0 (x)))
153 #define SCM_CLOSEDP(x) (!SCM_OPENP(x))
154 #define SCM_CLR_PORT_OPEN_FLAG(p) \
155 SCM_SET_CELL_WORD_0 ((p), SCM_CELL_WORD_0 (p) & ~SCM_OPN)
157 #define SCM_PTAB_ENTRY(x) ((scm_t_port *) SCM_CELL_WORD_1 (x))
158 #define SCM_SETPTAB_ENTRY(x, ent) (SCM_SET_CELL_WORD_1 ((x), (scm_t_bits) (ent)))
159 #define SCM_STREAM(x) (SCM_PTAB_ENTRY(x)->stream)
160 #define SCM_SETSTREAM(x, s) (SCM_PTAB_ENTRY(x)->stream = (scm_t_bits) (s))
161 #define SCM_FILENAME(x) (SCM_PTAB_ENTRY(x)->file_name)
162 #define SCM_SET_FILENAME(x, n) (SCM_PTAB_ENTRY(x)->file_name = (n))
163 #define SCM_LINUM(x) (SCM_PTAB_ENTRY(x)->line_number)
164 #define SCM_COL(x) (SCM_PTAB_ENTRY(x)->column_number)
165 #define SCM_REVEALED(x) (SCM_PTAB_ENTRY(x)->revealed)
166 #define SCM_SETREVEALED(x, s) (SCM_PTAB_ENTRY(x)->revealed = (s))
168 #define SCM_INCLINE(port) do {SCM_LINUM (port) += 1; SCM_COL (port) = 0;} while (0)
169 #define SCM_ZEROCOL(port) do {SCM_COL (port) = 0;} while (0)
170 #define SCM_INCCOL(port) do {SCM_COL (port) += 1;} while (0)
171 #define SCM_DECCOL(port) do {if (SCM_COL (port) > 0) SCM_COL (port) -= 1;} while (0)
172 #define SCM_TABCOL(port) do {SCM_COL (port) += 8 - SCM_COL (port) % 8;} while (0)
174 /* Maximum number of port types. */
175 #define SCM_I_MAX_PORT_TYPE_COUNT 256
179 /* port-type description. */
180 typedef struct scm_t_ptob_descriptor
184 size_t (*free
) (SCM
);
185 int (*print
) (SCM exp
, SCM port
, scm_print_state
*pstate
);
186 SCM (*equalp
) (SCM
, SCM
);
187 int (*close
) (SCM port
);
189 void (*write
) (SCM port
, const void *data
, size_t size
);
190 void (*flush
) (SCM port
);
192 void (*end_input
) (SCM port
, int offset
);
193 int (*fill_input
) (SCM port
);
194 int (*input_waiting
) (SCM port
);
196 scm_t_off (*seek
) (SCM port
, scm_t_off OFFSET
, int WHENCE
);
197 void (*truncate
) (SCM port
, scm_t_off length
);
199 } scm_t_ptob_descriptor
;
201 #define SCM_TC2PTOBNUM(x) (0x0ff & ((x) >> 8))
202 #define SCM_PTOBNUM(x) (SCM_TC2PTOBNUM (SCM_CELL_TYPE (x)))
203 /* SCM_PTOBNAME can be 0 if name is missing */
204 #define SCM_PTOBNAME(ptobnum) scm_ptobs[ptobnum].name
208 /* Hey you! Yes you, reading the header file! We're going to deprecate
209 scm_ptobs in 2.2, so please don't write any new code that uses it.
211 SCM_API scm_t_ptob_descriptor
*scm_ptobs
;
212 SCM_API
long scm_numptob
;
216 SCM_API SCM
scm_markstream (SCM ptr
);
217 SCM_API scm_t_bits
scm_make_port_type (char *name
,
218 int (*fill_input
) (SCM port
),
219 void (*write
) (SCM port
,
222 SCM_API
void scm_set_port_mark (scm_t_bits tc
, SCM (*mark
) (SCM
));
223 SCM_API
void scm_set_port_free (scm_t_bits tc
, size_t (*free
) (SCM
));
224 SCM_API
void scm_set_port_print (scm_t_bits tc
,
225 int (*print
) (SCM exp
,
227 scm_print_state
*pstate
));
228 SCM_API
void scm_set_port_equalp (scm_t_bits tc
, SCM (*equalp
) (SCM
, SCM
));
229 SCM_API
void scm_set_port_close (scm_t_bits tc
, int (*close
) (SCM
));
231 SCM_API
void scm_set_port_flush (scm_t_bits tc
,
232 void (*flush
) (SCM port
));
233 SCM_API
void scm_set_port_end_input (scm_t_bits tc
,
234 void (*end_input
) (SCM port
,
236 SCM_API
void scm_set_port_seek (scm_t_bits tc
,
237 scm_t_off (*seek
) (SCM port
,
240 SCM_API
void scm_set_port_truncate (scm_t_bits tc
,
241 void (*truncate
) (SCM port
,
243 SCM_API
void scm_set_port_input_waiting (scm_t_bits tc
, int (*input_waiting
) (SCM
));
244 SCM_API SCM
scm_char_ready_p (SCM port
);
245 size_t scm_take_from_input_buffers (SCM port
, char *dest
, size_t read_len
);
246 SCM_API SCM
scm_drain_input (SCM port
);
247 SCM_API SCM
scm_current_input_port (void);
248 SCM_API SCM
scm_current_output_port (void);
249 SCM_API SCM
scm_current_error_port (void);
250 SCM_API SCM
scm_current_warning_port (void);
251 SCM_API SCM
scm_current_load_port (void);
252 SCM_API SCM
scm_set_current_input_port (SCM port
);
253 SCM_API SCM
scm_set_current_output_port (SCM port
);
254 SCM_API SCM
scm_set_current_error_port (SCM port
);
255 SCM_API SCM
scm_set_current_warning_port (SCM port
);
256 SCM_API
void scm_dynwind_current_input_port (SCM port
);
257 SCM_API
void scm_dynwind_current_output_port (SCM port
);
258 SCM_API
void scm_dynwind_current_error_port (SCM port
);
259 SCM_API SCM
scm_new_port_table_entry (scm_t_bits tag
);
260 SCM_API
void scm_grow_port_cbuf (SCM port
, size_t requested
);
261 SCM_API SCM
scm_pt_size (void);
262 SCM_API SCM
scm_pt_member (SCM member
);
263 SCM_API
void scm_port_non_buffer (scm_t_port
*pt
);
264 SCM_API
int scm_revealed_count (SCM port
);
265 SCM_API SCM
scm_port_revealed (SCM port
);
266 SCM_API SCM
scm_set_port_revealed_x (SCM port
, SCM rcount
);
267 SCM_API
long scm_mode_bits (char *modes
);
268 SCM_API SCM
scm_port_mode (SCM port
);
269 SCM_API SCM
scm_close_input_port (SCM port
);
270 SCM_API SCM
scm_close_output_port (SCM port
);
271 SCM_API SCM
scm_close_port (SCM port
);
272 SCM_API SCM
scm_port_for_each (SCM proc
);
273 SCM_API
void scm_c_port_for_each (void (*proc
)(void *data
, SCM p
), void *data
);
274 SCM_API SCM
scm_input_port_p (SCM x
);
275 SCM_API SCM
scm_output_port_p (SCM x
);
276 SCM_API SCM
scm_port_p (SCM x
);
277 SCM_API SCM
scm_port_closed_p (SCM port
);
278 SCM_API SCM
scm_eof_object_p (SCM x
);
279 SCM_API SCM
scm_force_output (SCM port
);
280 SCM_API SCM
scm_flush_all_ports (void);
281 SCM_API SCM
scm_read_char (SCM port
);
282 SCM_API scm_t_wchar
scm_getc (SCM port
);
283 SCM_API
size_t scm_c_read (SCM port
, void *buffer
, size_t size
);
284 SCM_API
void scm_c_write (SCM port
, const void *buffer
, size_t size
);
285 SCM_API
void scm_lfwrite (const char *ptr
, size_t size
, SCM port
);
286 SCM_INTERNAL
void scm_lfwrite_substr (SCM str
, size_t start
, size_t end
,
288 SCM_API
void scm_flush (SCM port
);
289 SCM_API
void scm_end_input (SCM port
);
290 SCM_API
int scm_fill_input (SCM port
);
291 SCM_API
void scm_unget_byte (int c
, SCM port
);
292 SCM_API
void scm_ungetc (scm_t_wchar c
, SCM port
);
293 SCM_API
void scm_ungets (const char *s
, int n
, SCM port
);
294 SCM_API SCM
scm_peek_char (SCM port
);
295 SCM_API SCM
scm_unread_char (SCM cobj
, SCM port
);
296 SCM_API SCM
scm_unread_string (SCM str
, SCM port
);
297 SCM_API SCM
scm_seek (SCM object
, SCM offset
, SCM whence
);
298 SCM_API SCM
scm_truncate_file (SCM object
, SCM length
);
299 SCM_API SCM
scm_port_line (SCM port
);
300 SCM_API SCM
scm_set_port_line_x (SCM port
, SCM line
);
301 SCM_API SCM
scm_port_column (SCM port
);
302 SCM_API SCM
scm_set_port_column_x (SCM port
, SCM line
);
303 SCM_API SCM
scm_port_filename (SCM port
);
304 SCM_API SCM
scm_set_port_filename_x (SCM port
, SCM filename
);
305 SCM_INTERNAL
const char *scm_i_default_port_encoding (void);
306 SCM_INTERNAL
void scm_i_set_default_port_encoding (const char *);
307 SCM_INTERNAL
void scm_i_set_port_encoding_x (SCM port
, const char *str
);
308 SCM_API SCM
scm_port_encoding (SCM port
);
309 SCM_API SCM
scm_set_port_encoding_x (SCM port
, SCM encoding
);
310 SCM_INTERNAL scm_t_string_failed_conversion_handler
scm_i_get_conversion_strategy (SCM port
);
311 SCM_INTERNAL
void scm_i_set_conversion_strategy_x (SCM port
,
312 scm_t_string_failed_conversion_handler h
);
313 SCM_API SCM
scm_port_conversion_strategy (SCM port
);
314 SCM_API SCM
scm_set_port_conversion_strategy_x (SCM port
, SCM behavior
);
315 SCM_API
int scm_port_print (SCM exp
, SCM port
, scm_print_state
*);
316 SCM_API
void scm_print_port_mode (SCM exp
, SCM port
);
317 SCM_API SCM
scm_void_port (char * mode_str
);
318 SCM_API SCM
scm_sys_make_void_port (SCM mode
);
319 SCM_INTERNAL
void scm_init_ports (void);
321 #if SCM_ENABLE_DEPRECATED==1
322 SCM_DEPRECATED scm_t_port
* scm_add_to_port_table (SCM port
);
326 SCM_API SCM
scm_pt_size (void);
327 SCM_API SCM
scm_pt_member (SCM member
);
328 #endif /* GUILE_DEBUG */
332 SCM_INTERNAL
long scm_i_mode_bits (SCM modes
);
333 SCM_INTERNAL
void scm_i_dynwind_current_load_port (SCM port
);
336 #endif /* SCM_PORTS_H */