1 /* Header for coding system handler.
2 Copyright (C) 1995, 1997 Electrotechnical Laboratory, JAPAN.
3 Licensed to the Free Software Foundation.
5 This file is part of GNU Emacs.
7 GNU Emacs 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)
12 GNU Emacs 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.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
26 #include "../src/ccl.h"
29 /*** EMACS' INTERNAL FORMAT (emacs-mule) section ***/
31 /* All code (1-byte) of Emacs' internal format is classified into one
32 of the followings. See also `charset.h'. */
33 enum emacs_code_class_type
35 EMACS_control_code
, /* Control codes in the range
36 0x00..0x1F and 0x7F except for the
37 following two codes. */
38 EMACS_linefeed_code
, /* 0x0A (linefeed) to denote
40 EMACS_carriage_return_code
, /* 0x0D (carriage-return) to be used
41 in selective display mode. */
42 EMACS_ascii_code
, /* ASCII characters. */
43 EMACS_leading_code_composition
, /* Leading code of a composite
45 EMACS_leading_code_2
, /* Base leading code of official
47 EMACS_leading_code_3
, /* Base leading code of private TYPE9N
48 or official TYPE9Nx9N character. */
49 EMACS_leading_code_4
, /* Base leading code of private
50 TYPE9Nx9N character. */
51 EMACS_invalid_code
/* Invalid code, i.e. a base leading
52 code not yet assigned to any
53 charset, or a code of the range
57 extern enum emacs_code_class_type emacs_code_class
[256];
59 /*** ISO2022 section ***/
61 /* Macros to define code of control characters for ISO2022's functions. */
62 /* code */ /* function */
63 #define ISO_CODE_LF 0x0A /* line-feed */
64 #define ISO_CODE_CR 0x0D /* carriage-return */
65 #define ISO_CODE_SO 0x0E /* shift-out */
66 #define ISO_CODE_SI 0x0F /* shift-in */
67 #define ISO_CODE_SS2_7 0x19 /* single-shift-2 for 7-bit code */
68 #define ISO_CODE_ESC 0x1B /* escape */
69 #define ISO_CODE_SS2 0x8E /* single-shift-2 */
70 #define ISO_CODE_SS3 0x8F /* single-shift-3 */
71 #define ISO_CODE_CSI 0x9B /* control-sequence-introduce */
73 /* All code (1-byte) of ISO2022 is classified into one of the
75 enum iso_code_class_type
77 ISO_control_code
, /* Control codes in the range
78 0x00..0x1F, 0x7F, and 0x80..0x9F,
79 except for the following seven
81 ISO_carriage_return
, /* ISO_CODE_CR (0x0D) */
82 ISO_shift_out
, /* ISO_CODE_SO (0x0E) */
83 ISO_shift_in
, /* ISO_CODE_SI (0x0F) */
84 ISO_single_shift_2_7
, /* ISO_CODE_SS2_7 (0x19) */
85 ISO_escape
, /* ISO_CODE_SO (0x1B) */
86 ISO_single_shift_2
, /* ISO_CODE_SS2 (0x8E) */
87 ISO_single_shift_3
, /* ISO_CODE_SS3 (0x8F) */
88 ISO_control_sequence_introducer
, /* ISO_CODE_CSI (0x9B) */
89 ISO_0x20_or_0x7F
, /* Codes of the values 0x20 or 0x7F. */
90 ISO_graphic_plane_0
, /* Graphic codes in the range 0x21..0x7E. */
91 ISO_0xA0_or_0xFF
, /* Codes of the values 0xA0 or 0xFF. */
92 ISO_graphic_plane_1
/* Graphic codes in the range 0xA1..0xFE. */
95 /** The macros CODING_FLAG_ISO_XXX defines a flag bit of the `flags'
96 element in the structure `coding_system'. This information is used
97 while encoding a text to ISO2022. **/
99 /* If set, produce short-form designation sequence (e.g. ESC $ A)
100 instead of long-form sequence (e.g. ESC $ ( A). */
101 #define CODING_FLAG_ISO_SHORT_FORM 0x0001
103 /* If set, reset graphic planes and registers at end-of-line to the
105 #define CODING_FLAG_ISO_RESET_AT_EOL 0x0002
107 /* If set, reset graphic planes and registers before any control
108 characters to the initial state. */
109 #define CODING_FLAG_ISO_RESET_AT_CNTL 0x0004
111 /* If set, encode by 7-bit environment. */
112 #define CODING_FLAG_ISO_SEVEN_BITS 0x0008
114 /* If set, use locking-shift function. */
115 #define CODING_FLAG_ISO_LOCKING_SHIFT 0x0010
117 /* If set, use single-shift function. Overwrite
118 CODING_FLAG_ISO_LOCKING_SHIFT. */
119 #define CODING_FLAG_ISO_SINGLE_SHIFT 0x0020
121 /* If set, designate JISX0201-Roman instead of ASCII. */
122 #define CODING_FLAG_ISO_USE_ROMAN 0x0040
124 /* If set, designate JISX0208-1978 instead of JISX0208-1983. */
125 #define CODING_FLAG_ISO_USE_OLDJIS 0x0080
127 /* If set, do not produce ISO6429's direction specifying sequence. */
128 #define CODING_FLAG_ISO_NO_DIRECTION 0x0100
130 /* If set, assume designation states are reset at beginning of line on
132 #define CODING_FLAG_ISO_INIT_AT_BOL 0x0200
134 /* If set, designation sequence should be placed at beginning of line
136 #define CODING_FLAG_ISO_DESIGNATE_AT_BOL 0x0400
138 /* If set, do not encode unsafe charactes on output. */
139 #define CODING_FLAG_ISO_SAFE 0x0800
141 /* If set, extra latin codes (128..159) are accepted as a valid code
143 #define CODING_FLAG_ISO_LATIN_EXTRA 0x1000
145 /* If set, use designation escape sequence. */
146 #define CODING_FLAG_ISO_DESIGNATION 0x10000
148 /* A character to be produced on output if encoding of the original
149 character is prohibited by CODING_FLAG_ISO_SAFE. */
150 #define CODING_INHIBIT_CHARACTER_SUBSTITUTION 077 /* 077 == `?' */
152 /* Structure of the field `spec.iso2022' in the structure `coding_system'. */
155 /* The current graphic register invoked to each graphic plane. */
156 int current_invocation
[2];
158 /* The current charset designated to each graphic register. */
159 int current_designation
[4];
161 /* A charset initially designated to each graphic register. */
162 int initial_designation
[4];
164 /* If not -1, it is a graphic register specified in an invalid
165 designation sequence. */
166 int last_invalid_designation_register
;
168 /* A graphic register to which each charset should be designated. */
169 unsigned char requested_designation
[MAX_CHARSET
+ 1];
171 /* A revision number to be specified for each charset on encoding.
172 The value 255 means no revision number for the corresponding
174 unsigned char charset_revision_number
[MAX_CHARSET
+ 1];
176 /* Set to 1 temporarily only when graphic register 2 or 3 is invoked
177 by single-shift while encoding. */
180 /* Set to 1 temporarily only when processing at beginning of line. */
184 /* Macros to access each field in the structure `spec.iso2022'. */
185 #define CODING_SPEC_ISO_INVOCATION(coding, plane) \
186 (coding)->spec.iso2022.current_invocation[plane]
187 #define CODING_SPEC_ISO_DESIGNATION(coding, reg) \
188 (coding)->spec.iso2022.current_designation[reg]
189 #define CODING_SPEC_ISO_INITIAL_DESIGNATION(coding, reg) \
190 (coding)->spec.iso2022.initial_designation[reg]
191 #define CODING_SPEC_ISO_REQUESTED_DESIGNATION(coding, charset) \
192 (coding)->spec.iso2022.requested_designation[charset]
193 #define CODING_SPEC_ISO_REVISION_NUMBER(coding, charset) \
194 (coding)->spec.iso2022.charset_revision_number[charset]
195 #define CODING_SPEC_ISO_SINGLE_SHIFTING(coding) \
196 (coding)->spec.iso2022.single_shifting
197 #define CODING_SPEC_ISO_BOL(coding) \
198 (coding)->spec.iso2022.bol
200 /* A value which may appear in
201 coding->spec.iso2022.requested_designation indicating that the
202 corresponding charset does not request any graphic register to be
204 #define CODING_SPEC_ISO_NO_REQUESTED_DESIGNATION 4
206 /* Return a charset which is currently designated to the graphic plane
207 PLANE in the coding-system CODING. */
208 #define CODING_SPEC_ISO_PLANE_CHARSET(coding, plane) \
209 ((CODING_SPEC_ISO_INVOCATION (coding, plane) < 0) \
211 : CODING_SPEC_ISO_DESIGNATION (coding, \
212 CODING_SPEC_ISO_INVOCATION (coding, plane)))
214 /*** BIG5 section ***/
216 /* Macros to denote each type of BIG5 coding system. */
217 #define CODING_FLAG_BIG5_HKU 0x00 /* BIG5-HKU is one of variants of
218 BIG5 developed by Hong Kong
220 #define CODING_FLAG_BIG5_ETEN 0x01 /* BIG5_ETen is one of variants
221 of BIG5 developed by the
222 company ETen in Taiwan. */
224 /*** GENERAL section ***/
226 /* Types of coding system. */
229 coding_type_no_conversion
, /* A coding system which requires no
230 conversion for reading and writing
231 including end-of-line format. */
232 coding_type_emacs_mule
, /* A coding system used in Emacs'
233 buffer and string. Requires no
234 conversion for reading and writing
235 except for end-of-line format. */
236 coding_type_undecided
, /* A coding system which requires
237 automatic detection of a real
239 coding_type_sjis
, /* SJIS coding system for Japanese. */
240 coding_type_iso2022
, /* Any coding system of ISO2022
242 coding_type_big5
, /* BIG5 coding system for Chinese. */
243 coding_type_ccl
, /* The coding system of which decoder
244 and encoder are written in CCL. */
245 coding_type_raw_text
/* A coding system for a text
246 containing ramdom 8-bit code which
247 does not require code conversion
248 except for end-of-line format. */
251 /* Formats of end-of-line. */
252 #define CODING_EOL_LF 0 /* Line-feed only, same as Emacs'
254 #define CODING_EOL_CRLF 1 /* Sequence of carriage-return and
256 #define CODING_EOL_CR 2 /* Carriage-return only. */
257 #define CODING_EOL_UNDECIDED 3 /* This value is used to denote the
258 eol-type is not yet decided. */
259 #define CODING_EOL_INCONSISTENT 4 /* This value is used to denote the
260 eol-type is not consistent
263 /* Character composition status while encoding/decoding. */
264 #define COMPOSING_NO 0 /* not composing */
265 #define COMPOSING_WITH_RULE_HEAD 1 /* 1st char of with-rule composing follow */
266 #define COMPOSING_NO_RULE_HEAD 2 /* 1st char of no-rule composing follow */
267 #define COMPOSING_WITH_RULE_TAIL 3 /* Nth char of with-rule composing follow */
268 #define COMPOSING_NO_RULE_TAIL 4 /* Nth char of no-rule composing follow */
269 #define COMPOSING_WITH_RULE_RULE 5 /* composition rule follow */
271 /* 1 iff composing. */
272 #define COMPOSING_P(composing) (composing)
273 /* 1 iff 1st char of composing element follows. */
274 #define COMPOSING_HEAD_P(composing) \
275 ((composing) && (composing) <= COMPOSING_NO_RULE_HEAD)
276 /* 1 iff composing with embeded composition rule. */
277 #define COMPOSING_WITH_RULE_P(composing) ((composing) & 1)
279 /* Macros used for the member finish_status of the struct
281 #define CODING_FINISH_NORMAL 0
282 #define CODING_FINISH_INSUFFICIENT_SRC 1
283 #define CODING_FINISH_INSUFFICIENT_DST 2
284 #define CODING_FINISH_INCONSISTENT_EOL 3
286 /* Macros used for the member `mode' of the struct coding_system. */
288 /* If set, recover the original CR or LF of the already decoded text
289 when the decoding routine encounters an inconsistent eol format. */
290 #define CODING_MODE_INHIBIT_INCONSISTENT_EOL 0x01
292 /* If set, the decoding/encoding routines treat the current data as
293 the last block of the whole text to be converted, and do
294 appropriate fisishing job. */
295 #define CODING_MODE_LAST_BLOCK 0x02
297 /* If set, it means that the current source text is in a buffer which
298 enables selective display. */
299 #define CODING_MODE_SELECTIVE_DISPLAY 0x04
301 /* This flag is used by the decoding/encoding routines on the fly. If
302 set, it means that right-to-left text is being processed. */
303 #define CODING_MODE_DIRECTION 0x08
307 /* Type of the coding system. */
308 enum coding_type type
;
310 /* Type of end-of-line format (LF, CRLF, or CR) of the coding system. */
313 /* Flag bits of the coding system. The meaning of each bit is common
314 to all types of coding systems. */
315 unsigned int common_flags
;
317 /* Flag bits of the coding system. The meaning of each bit depends
318 on the type of the coding system. */
321 /* Mode bits of the coding system. See the comments of the macros
325 /* Table of safe character sets for this coding system. If the Nth
326 element is 0, the charset of ID N is not a safe character set.
327 Such a character set is not encoded when CODING_ISO_FLAG_SAFE is
329 unsigned char safe_charsets
[MAX_CHARSET
+ 1];
331 /* Non-zero means that characters are being composed currently while
332 decoding or encoding. See macros COMPOSING_XXXX above for the
333 meaing of each non-zero value. */
336 /* Detailed information specific to each type of coding system. */
339 struct iso2022_spec iso2022
;
340 struct ccl_spec ccl
; /* Defined in ccl.h. */
343 /* Index number of coding category of the coding system. */
346 /* How may heading bytes we can skip for decoding. This is set to
347 -1 in setup_coding_system, and updated by detect_coding. So,
348 when this is equal to the byte length of the text being
349 converted, we can skip the actual conversion process. */
352 /* The following members are set by encoding/decoding routine. */
353 int produced
, produced_char
, consumed
, consumed_char
;
355 /* Encoding routines set this to 1 when they produce a byte sequence
356 which can be parsed as a multibyte character. Decoding routines
357 set this to 1 when they encounter an invalid code and, as the
358 result, produce an unexpected multibyte character. */
361 /* The following members are all Lisp symbols. We don't have to
362 protect them from GC because the current garbage collection
363 doesn't relocate Lisp symbols. But, when it is changed, we must
364 find a way to protect them. */
366 /* Backward pointer to the Lisp symbol of the coding system. */
369 /* Lisp function (symbol) to be called after decoding to do
370 additional conversion, or nil. */
371 Lisp_Object post_read_conversion
;
373 /* Lisp function (symbol) to be called before encoding to do
374 additional conversion, or nil. */
375 Lisp_Object pre_write_conversion
;
377 /* Character unification tables to look up, or nil. */
378 Lisp_Object character_unification_table_for_decode
;
379 Lisp_Object character_unification_table_for_encode
;
382 #define CODING_REQUIRE_FLUSHING_MASK 1
383 #define CODING_REQUIRE_DECODING_MASK 2
384 #define CODING_REQUIRE_ENCODING_MASK 4
385 #define CODING_REQUIRE_DETECTION_MASK 8
387 /* Return 1 if the coding system CODING requires specific code to be
388 attached at the tail of converted text. */
389 #define CODING_REQUIRE_FLUSHING(coding) \
390 ((coding)->common_flags & CODING_REQUIRE_FLUSHING_MASK)
392 /* Return 1 if the coding system CODING requires code conversion on
394 #define CODING_REQUIRE_DECODING(coding) \
395 ((coding)->common_flags & CODING_REQUIRE_DECODING_MASK)
397 /* Return 1 if the coding system CODING requires code conversion on
399 #define CODING_REQUIRE_ENCODING(coding) \
400 ((coding)->common_flags & CODING_REQUIRE_ENCODING_MASK)
402 /* Return 1 if the coding system CODING requires some kind of code
404 #define CODING_REQUIRE_DETECTION(coding) \
405 ((coding)->common_flags & CODING_REQUIRE_DETECTION_MASK)
407 #define CODING_MAY_REQUIRE_DECODING(coding) \
408 ((coding)->common_flags \
409 & (CODING_REQUIRE_DETECTION_MASK | CODING_REQUIRE_DECODING_MASK))
411 /* Index for each coding category in `coding_category_table' */
412 #define CODING_CATEGORY_IDX_EMACS_MULE 0
413 #define CODING_CATEGORY_IDX_SJIS 1
414 #define CODING_CATEGORY_IDX_ISO_7 2
415 #define CODING_CATEGORY_IDX_ISO_7_TIGHT 3
416 #define CODING_CATEGORY_IDX_ISO_8_1 4
417 #define CODING_CATEGORY_IDX_ISO_8_2 5
418 #define CODING_CATEGORY_IDX_ISO_7_ELSE 6
419 #define CODING_CATEGORY_IDX_ISO_8_ELSE 7
420 #define CODING_CATEGORY_IDX_BIG5 8
421 #define CODING_CATEGORY_IDX_RAW_TEXT 9
422 #define CODING_CATEGORY_IDX_BINARY 10
423 #define CODING_CATEGORY_IDX_MAX 11
425 /* Definitions of flag bits returned by the function
426 detect_coding_mask (). */
427 #define CODING_CATEGORY_MASK_EMACS_MULE (1 << CODING_CATEGORY_IDX_EMACS_MULE)
428 #define CODING_CATEGORY_MASK_SJIS (1 << CODING_CATEGORY_IDX_SJIS)
429 #define CODING_CATEGORY_MASK_ISO_7 (1 << CODING_CATEGORY_IDX_ISO_7)
430 #define CODING_CATEGORY_MASK_ISO_7_TIGHT (1 << CODING_CATEGORY_IDX_ISO_7_TIGHT)
431 #define CODING_CATEGORY_MASK_ISO_8_1 (1 << CODING_CATEGORY_IDX_ISO_8_1)
432 #define CODING_CATEGORY_MASK_ISO_8_2 (1 << CODING_CATEGORY_IDX_ISO_8_2)
433 #define CODING_CATEGORY_MASK_ISO_7_ELSE (1 << CODING_CATEGORY_IDX_ISO_7_ELSE)
434 #define CODING_CATEGORY_MASK_ISO_8_ELSE (1 << CODING_CATEGORY_IDX_ISO_8_ELSE)
435 #define CODING_CATEGORY_MASK_BIG5 (1 << CODING_CATEGORY_IDX_BIG5)
436 #define CODING_CATEGORY_MASK_RAW_TEXT (1 << CODING_CATEGORY_IDX_RAW_TEXT)
437 #define CODING_CATEGORY_MASK_BINARY (1 << CODING_CATEGORY_IDX_BINARY)
439 /* This value is returned if detect_coding_mask () find nothing other
440 than ASCII characters. */
441 #define CODING_CATEGORY_MASK_ANY \
442 ( CODING_CATEGORY_MASK_EMACS_MULE \
443 | CODING_CATEGORY_MASK_SJIS \
444 | CODING_CATEGORY_MASK_ISO_7 \
445 | CODING_CATEGORY_MASK_ISO_7_TIGHT \
446 | CODING_CATEGORY_MASK_ISO_8_1 \
447 | CODING_CATEGORY_MASK_ISO_8_2 \
448 | CODING_CATEGORY_MASK_ISO_7_ELSE \
449 | CODING_CATEGORY_MASK_ISO_8_ELSE \
450 | CODING_CATEGORY_MASK_BIG5)
452 #define CODING_CATEGORY_MASK_ISO_7BIT \
453 (CODING_CATEGORY_MASK_ISO_7 | CODING_CATEGORY_MASK_ISO_7_TIGHT)
455 #define CODING_CATEGORY_MASK_ISO_8BIT \
456 (CODING_CATEGORY_MASK_ISO_8_1 | CODING_CATEGORY_MASK_ISO_8_2)
458 #define CODING_CATEGORY_MASK_ISO_SHIFT \
459 (CODING_CATEGORY_MASK_ISO_7_ELSE | CODING_CATEGORY_MASK_ISO_8_ELSE)
461 #define CODING_CATEGORY_MASK_ISO \
462 ( CODING_CATEGORY_MASK_ISO_7BIT \
463 | CODING_CATEGORY_MASK_ISO_SHIFT \
464 | CODING_CATEGORY_MASK_ISO_8BIT)
466 /* Macros to decode or encode a character of JISX0208 in SJIS. S1 and
467 S2 are the 1st and 2nd position-codes of JISX0208 in SJIS coding
468 system. C1 and C2 are the 1st and 2nd position codes of Emacs'
471 #define DECODE_SJIS(s1, s2, c1, c2) \
474 c1 = s1 * 2 - (s1 >= 0xE0 ? 0x160 : 0xE0), \
477 c1 = s1 * 2 - ((s1 >= 0xE0) ? 0x161 : 0xE1), \
478 c2 = s2 - ((s2 >= 0x7F) ? 0x20 : 0x1F); \
481 #define ENCODE_SJIS(c1, c2, s1, s2) \
484 s1 = c1 / 2 + ((c1 < 0x5F) ? 0x71 : 0xB1), \
485 s2 = c2 + ((c2 >= 0x60) ? 0x20 : 0x1F); \
487 s1 = c1 / 2 + ((c1 < 0x5F) ? 0x70 : 0xB0), \
491 /* Encode the file name NAME using the specified coding system
492 for file names, if any. */
493 #define ENCODE_FILE(name) \
494 (! NILP (Vfile_name_coding_system) \
495 && XFASTINT (Vfile_name_coding_system) != 0 \
496 ? Fencode_coding_string (name, Vfile_name_coding_system, Qt) \
497 : (! NILP (Vdefault_file_name_coding_system) \
498 && XFASTINT (Vdefault_file_name_coding_system) \
499 ? Fencode_coding_string (name, Vdefault_file_name_coding_system, Qt) \
502 /* Decode the file name NAME using the specified coding system
503 for file names, if any. */
504 #define DECODE_FILE(name) \
505 (! NILP (Vfile_name_coding_system) \
506 && XFASTINT (Vfile_name_coding_system) != 0 \
507 ? Fdecode_coding_string (name, Vfile_name_coding_system, Qt) \
508 : (! NILP (Vdefault_file_name_coding_system) \
509 && XFASTINT (Vdefault_file_name_coding_system) \
510 ? Fdecode_coding_string (name, Vdefault_file_name_coding_system, Qt) \
513 /* Extern declarations. */
514 extern int decode_coding
P_ ((struct coding_system
*, unsigned char *,
515 unsigned char *, int, int));
516 extern int encode_coding
P_ ((struct coding_system
*, unsigned char *,
517 unsigned char *, int, int));
518 extern int code_convert_region
P_ ((int, int, int, int, struct coding_system
*,
520 extern int decoding_buffer_size
P_ ((struct coding_system
*, int));
521 extern int encoding_buffer_size
P_ ((struct coding_system
*, int));
522 extern void detect_coding
P_ ((struct coding_system
*, unsigned char *, int));
523 extern void detect_eol
P_ ((struct coding_system
*, unsigned char *, int));
524 extern int conversion_buffer_size
;
525 extern char *conversion_buffer
;
526 extern char *get_conversion_buffer
P_ ((int));
527 extern int setup_coding_system
P_ ((Lisp_Object
, struct coding_system
*));
528 extern Lisp_Object Qcoding_system
, Qeol_type
, Qcoding_category_index
;
529 extern Lisp_Object Qraw_text
;
530 extern Lisp_Object Qbuffer_file_coding_system
;
531 extern Lisp_Object Vcoding_category_list
;
533 /* Mnemonic character to indicate each type of end-of-line. */
534 extern int eol_mnemonic_unix
, eol_mnemonic_dos
, eol_mnemonic_mac
;
535 /* Mnemonic character to indicate type of end-of-line is not yet decided. */
536 extern int eol_mnemonic_undecided
;
539 extern Lisp_Object Qfile_coding_system
;
540 extern Lisp_Object Qcall_process
, Qcall_process_region
, Qprocess_argument
;
541 extern Lisp_Object Qstart_process
, Qopen_network_stream
;
543 /* Coding-system for reading files and receiving data from process. */
544 extern Lisp_Object Vcoding_system_for_read
;
545 /* Coding-system for writing files and sending data to process. */
546 extern Lisp_Object Vcoding_system_for_write
;
547 /* Coding-system actually used in the latest I/O. */
548 extern Lisp_Object Vlast_coding_system_used
;
550 /* Coding-system to be used for encoding terminal output. This
551 structure contains information of a coding-system specified by the
552 function `set-terminal-coding-system'. */
553 extern struct coding_system terminal_coding
;
555 /* Coding system to be used to encode text for terminal display when
556 terminal coding system is nil. */
557 extern struct coding_system safe_terminal_coding
;
559 /* Coding-system of what is sent from terminal keyboard. This
560 structure contains information of a coding-system specified by the
561 function `set-keyboard-coding-system'. */
562 extern struct coding_system keyboard_coding
;
564 /* Default coding systems used for process I/O. */
565 extern Lisp_Object Vdefault_process_coding_system
;
567 /* Function to call to force a user to force select a propert coding
569 extern Lisp_Object Vselect_safe_coding_system_function
;
573 #endif /* _CODING_H */