src/character.h

   1 /* Header for multibyte character handler.
   2    Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN.
   3    Licensed to the Free Software Foundation.
   4    Copyright (C) 2001, 2002
   5      National Institute of Advanced Industrial Science and Technology (AIST)
   6      Registration Number H13PRO009
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs; see the file COPYING.  If not, write to
  22 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 Boston, MA 02111-1307, USA.  */
  24
  25 #ifndef EMACS_CHARACTER_H
  26 #define EMACS_CHARACTER_H
  27
  28 /* character code       1st byte   byte sequence
  29    --------------       --------   -------------
  30         0-7F            00..7F     0xxxxxxx
  31        80-7FF           C2..DF     110xxxxx 10xxxxxx
  32       800-FFFF          E0..EF     1110xxxx 10xxxxxx 10xxxxxx
  33     10000-1FFFFF        F0..F7     11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
  34    200000-3FFF7F        F8         11111000 1000xxxx 10xxxxxx 10xxxxxx 10xxxxxx
  35       invalid           F9..FF
  36
  37    raw-8-bit
  38    3FFF80-3FFFFF        C0..C1     1100000x 10xxxxxx
  39 */
  40
  41 /* Maximum character code ((1 << CHARACTERBITS) - 1).  */
  42 #define MAX_CHAR  0x3FFFFF
  43
  44 /* Maximum Unicode character code.  */
  45 #define MAX_UNICODE_CHAR 0x10FFFF
  46
  47 /* Maximum N-byte character codes.  */
  48 #define MAX_1_BYTE_CHAR 0x7F
  49 #define MAX_2_BYTE_CHAR 0x7FF
  50 #define MAX_3_BYTE_CHAR 0xFFFF
  51 #define MAX_4_BYTE_CHAR 0x1FFFFF
  52 #define MAX_5_BYTE_CHAR 0x3FFF7F
  53
  54 /* Return the character code for raw 8-bit byte BYTE.  */
  55 #define BYTE8_TO_CHAR(byte) ((byte) + 0x3FFF00)
  56
  57 /* Return the raw 8-bit byte for character C.  */
  58 #define CHAR_TO_BYTE8(c) ((c) - 0x3FFF00)
  59
  60 /* Nonzero iff C is a character that corresponds to a raw 8-bit
  61    byte.  */
  62 #define CHAR_BYTE8_P(c) ((c) > MAX_5_BYTE_CHAR)
  63
  64 /* Nonzero iff BYTE is the 1st byte of a multibyte form of a character
  65    that corresponds to a raw 8-bit byte.  */
  66 #define CHAR_BYTE8_HEAD_P(byte) ((byte) == 0xC0 || (byte) == 0xC1)
  67
  68 /* This is the maximum byte length of multibyte form.  */
  69 #define MAX_MULTIBYTE_LENGTH 5
  70
  71 /* Return a Lisp character whose character code is C. */
  72 #define make_char(c) make_number (c)
  73
  74 /* Nonzero iff C is an ASCII byte.  */
  75 #define ASCII_BYTE_P(c) ((unsigned) (c) < 0x80)
  76
  77 /* Nonzero iff X is a character.  */
  78 #define CHARACTERP(x) (NATNUMP (x) && XFASTINT (x) <= MAX_CHAR)
  79
  80 /* Nozero iff C is valid as a charater code.  GENERICP is not used
  81    now.  */
  82 #define CHAR_VALID_P(c, genericp) ((unsigned) (c) <= MAX_CHAR)
  83
  84 /* Check if Lisp object X is a character or not.  */
  85 #define CHECK_CHARACTER(x)                                              \
  86   do {                                                                  \
  87     if (! CHARACTERP(x)) x = wrong_type_argument (Qcharacterp, (x));    \
  88   } while (0)
  89
  90 /* Nonzero iff C is an ASCII character.  */
  91 #define ASCII_CHAR_P(c) ((unsigned) (c) < 0x80)
  92
  93 /* Nonzero iff C is a character of code less than 0x100.  */
  94 #define SINGLE_BYTE_CHAR_P(c) ((unsigned) (c) < 0x100)
  95
  96 /* Nonzero if character C has a printable glyph.  */
  97 #define CHAR_PRINTABLE_P(c)     \
  98   (((c) >= 32 && ((c) < 127)    \
  99     || ! NILP (CHAR_TABLE_REF (Vprintable_chars, (c)))))
 100
 101 /* Return byte length of multibyte form for character C.  */
 102 #define CHAR_BYTES(c)                   \
 103   ( (c) <= MAX_1_BYTE_CHAR ? 1          \
 104     : (c) <= MAX_2_BYTE_CHAR ? 2        \
 105     : (c) <= MAX_3_BYTE_CHAR ? 3        \
 106     : (c) <= MAX_4_BYTE_CHAR ? 4        \
 107     : (c) <= MAX_5_BYTE_CHAR ? 5        \
 108     : 2)
 109
 110 /* Store multibyte form of the character C in P.  The caller should
 111    allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
 112    Returns the length of the multibyte form.  */
 113
 114 #define CHAR_STRING(c, p)                       \
 115   ((unsigned) (c) <= MAX_1_BYTE_CHAR            \
 116    ? ((p)[0] = (c),                             \
 117       1)                                        \
 118    : (unsigned) (c) <= MAX_2_BYTE_CHAR          \
 119    ? ((p)[0] = (0xC0 | ((c) >> 6)),             \
 120       (p)[1] = (0x80 | ((c) & 0x3F)),           \
 121       2)                                        \
 122    : (unsigned) (c) <= MAX_3_BYTE_CHAR          \
 123    ? ((p)[0] = (0xE0 | ((c) >> 12)),            \
 124       (p)[1] = (0x80 | (((c) >> 6) & 0x3F)),    \
 125       (p)[2] = (0x80 | ((c) & 0x3F)),           \
 126       3)                                        \
 127    : (unsigned) (c) <= MAX_5_BYTE_CHAR          \
 128    ? char_string_with_unification (c, p)        \
 129    : ((p)[0] = (0xC0 | (((c) >> 6) & 0x01)),    \
 130       (p)[1] = (0x80 | ((c) & 0x3F)),           \
 131       2))
 132
 133
 134 /* Store multibyte form of the character C in P.  The caller should
 135    allocate at least MAX_MULTIBYTE_LENGTH bytes area at P in advance.
 136    And, advance P to the end of the multibyte form.  */
 137
 138 #define CHAR_STRING_ADVANCE(c, p)                       \
 139   do {                                                  \
 140     if ((c) <= MAX_1_BYTE_CHAR)                         \
 141       *(p)++ = (c);                                     \
 142     else if ((c) <= MAX_2_BYTE_CHAR)                    \
 143       *(p)++ = (0xC0 | ((c) >> 6)),                     \
 144         *(p)++ = (0x80 | ((c) & 0x3F));                 \
 145     else if ((c) <= MAX_3_BYTE_CHAR)                    \
 146       *(p)++ = (0xE0 | ((c) >> 12)),                    \
 147         *(p)++ = (0x80 | (((c) >> 6) & 0x3F)),          \
 148         *(p)++ = (0x80 | ((c) & 0x3F));                 \
 149     else if ((c) <= MAX_5_BYTE_CHAR)                    \
 150       (p) += char_string_with_unification ((c), (p));   \
 151     else                                                \
 152       *(p)++ = (0xC0 | (((c) >> 6) & 0x01)),            \
 153         *(p)++ = (0x80 | ((c) & 0x3F));                 \
 154   } while (0)
 155
 156 /* Nonzero iff BYTE starts a non-ASCII character in a multibyte
 157    form.  */
 158 #define LEADING_CODE_P(byte) (((byte) & 0xC0) == 0xC0)
 159
 160 /* Nonzero iff BYTE starts a character in a multibyte form.
 161    This is equivalent to:
 162         (ASCII_BYTE_P (byte) || LEADING_CODE_P (byte))  */
 163 #define CHAR_HEAD_P(byte) (((byte) & 0xC0) != 0x80)
 164
 165 /* Just kept for backward compatibility.  This macro will be removed
 166    in the future.  */
 167 #define BASE_LEADING_CODE_P LEADING_CODE_P
 168
 169 /* How many bytes a character that starts with BYTE occupies in a
 170    multibyte form.  */
 171 #define BYTES_BY_CHAR_HEAD(byte)        \
 172   (!((byte) & 0x80) ? 1                 \
 173    : !((byte) & 0x20) ? 2               \
 174    : !((byte) & 0x10) ? 3               \
 175    : !((byte) & 0x08) ? 4               \
 176    : 5)
 177
 178
 179 /* Return the length of the multi-byte form at string STR of length
 180    LEN while assuming that STR points a valid multi-byte form.  As
 181    this macro isn't necessary anymore, all callers will be changed to
 182    use BYTES_BY_CHAR_HEAD directly in the future.  */
 183
 184 #define MULTIBYTE_FORM_LENGTH(str, len)         \
 185   BYTES_BY_CHAR_HEAD (*(str))
 186
 187 /* Parse multibyte string STR of length LENGTH and set BYTES to the
 188    byte length of a character at STR while assuming that STR points a
 189    valid multibyte form.  As this macro isn't necessary anymore, all
 190    callers will be changed to use BYTES_BY_CHAR_HEAD directly in the
 191    future.  */
 192
 193 #define PARSE_MULTIBYTE_SEQ(str, length, bytes) \
 194   (bytes) = BYTES_BY_CHAR_HEAD (*(str))
 195
 196 /* The byte length of multibyte form at unibyte string P ending at
 197    PEND.  If STR doesn't point a valid multibyte form, return 0.  */
 198
 199 #define MULTIBYTE_LENGTH(p, pend)                               \
 200   (p >= pend ? 0                                                \
 201    : !((p)[0] & 0x80) ? 1                                       \
 202    : ((p + 1 >= pend) || (((p)[1] & 0xC0) != 0x80)) ? 0         \
 203    : ((p)[0] & 0xE0) == 0xC0 ? 2                                \
 204    : ((p + 2 >= pend) || (((p)[2] & 0xC0) != 0x80)) ? 0         \
 205    : ((p)[0] & 0xF0) == 0xE0 ? 3                                \
 206    : ((p + 3 >= pend) || (((p)[3] & 0xC0) != 0x80)) ? 0         \
 207    : ((p)[0] & 0xF8) == 0xF0 ? 4                                \
 208    : ((p + 4 >= pend) || (((p)[4] & 0xC0) != 0x80)) ? 0         \
 209    : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5              \
 210    : 0)
 211
 212
 213 /* Like MULTIBYTE_LENGTH but don't check the ending address.  */
 214
 215 #define MULTIBYTE_LENGTH_NO_CHECK(p)                    \
 216   (!((p)[0] & 0x80) ? 1                                 \
 217    : ((p)[1] & 0xC0) != 0x80 ? 0                        \
 218    : ((p)[0] & 0xE0) == 0xC0 ? 2                        \
 219    : ((p)[2] & 0xC0) != 0x80 ? 0                        \
 220    : ((p)[0] & 0xF0) == 0xE0 ? 3                        \
 221    : ((p)[3] & 0xC0) != 0x80 ? 0                        \
 222    : ((p)[0] & 0xF8) == 0xF0 ? 4                        \
 223    : ((p)[4] & 0xC0) != 0x80 ? 0                        \
 224    : (p)[0] == 0xF8 && ((p)[1] & 0xF0) == 0x80 ? 5      \
 225    : 0)
 226
 227
 228 /* Return the character code of character whose multibyte form is at
 229    P.  The argument LEN is ignored.  It will be removed in the
 230    future.  */
 231
 232 #define STRING_CHAR(p, len)                                     \
 233   (!((p)[0] & 0x80)                                             \
 234    ? (p)[0]                                                     \
 235    : ! ((p)[0] & 0x20)                                          \
 236    ? (((((p)[0] & 0x1F) << 6)                                   \
 237        | ((p)[1] & 0x3F))                                       \
 238       + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0))       \
 239    : ! ((p)[0] & 0x10)                                          \
 240    ? ((((p)[0] & 0x0F) << 12)                                   \
 241       | (((p)[1] & 0x3F) << 6)                                  \
 242       | ((p)[2] & 0x3F))                                        \
 243    : string_char_with_unification ((p), NULL, NULL))
 244
 245
 246 /* Like STRING_CHAR but set ACTUAL_LEN to the length of multibyte
 247    form.  The argument LEN is ignored.  It will be removed in the
 248    future.  */
 249
 250 #define STRING_CHAR_AND_LENGTH(p, len, actual_len)              \
 251   (!((p)[0] & 0x80)                                             \
 252    ? ((actual_len) = 1, (p)[0])                                 \
 253    : ! ((p)[0] & 0x20)                                          \
 254    ? ((actual_len) = 2,                                         \
 255       (((((p)[0] & 0x1F) << 6)                                  \
 256         | ((p)[1] & 0x3F))                                      \
 257        + (((unsigned char) (p)[0]) < 0xC2 ? 0x3FFF80 : 0)))     \
 258    : ! ((p)[0] & 0x10)                                          \
 259    ? ((actual_len) = 3,                                         \
 260       ((((p)[0] & 0x0F) << 12)                                  \
 261        | (((p)[1] & 0x3F) << 6)                                 \
 262        | ((p)[2] & 0x3F)))                                      \
 263    : string_char_with_unification ((p), NULL, &actual_len))
 264
 265
 266 /* Like STRING_CHAR but advacen P to the end of multibyte form.  */
 267
 268 #define STRING_CHAR_ADVANCE(p)                                  \
 269   (!((p)[0] & 0x80)                                             \
 270    ? *(p)++                                                     \
 271    : ! ((p)[0] & 0x20)                                          \
 272    ? ((p) += 2,                                                 \
 273       ((((p)[-2] & 0x1F) << 6)                                  \
 274        | ((p)[-1] & 0x3F)                                       \
 275        | (((unsigned char) (p)[-2]) < 0xC2 ? 0x3FFF80 : 0)))    \
 276    : ! ((p)[0] & 0x10)                                          \
 277    ? ((p) += 3,                                                 \
 278       ((((p)[-3] & 0x0F) << 12)                                 \
 279        | (((p)[-2] & 0x3F) << 6)                                \
 280        | ((p)[-1] & 0x3F)))                                     \
 281    : string_char_with_unification ((p), &(p), NULL))
 282
 283
 284 /* Fetch the "next" character from Lisp string STRING at byte position
 285    BYTEIDX, character position CHARIDX.  Store it into OUTPUT.
 286
 287    All the args must be side-effect-free.
 288    BYTEIDX and CHARIDX must be lvalues;
 289    we increment them past the character fetched.  */
 290
 291 #define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX)     \
 292   if (1)                                                                \
 293     {                                                                   \
 294       CHARIDX++;                                                        \
 295       if (STRING_MULTIBYTE (STRING))                                    \
 296         {                                                               \
 297           unsigned char *ptr = &XSTRING (STRING)->data[BYTEIDX];        \
 298           int len;                                                      \
 299                                                                         \
 300           OUTPUT = STRING_CHAR_AND_LENGTH (ptr, 0, len);                \
 301           BYTEIDX += len;                                               \
 302         }                                                               \
 303       else                                                              \
 304         OUTPUT = XSTRING (STRING)->data[BYTEIDX++];                     \
 305     }                                                                   \
 306   else
 307
 308
 309 /* Like FETCH_STRING_CHAR_ADVANCE but assumes STRING is multibyte.  */
 310
 311 #define FETCH_STRING_CHAR_ADVANCE_NO_CHECK(OUTPUT, STRING, CHARIDX, BYTEIDX) \
 312   if (1)                                                                     \
 313     {                                                                        \
 314       unsigned char *ptr = &XSTRING (STRING)->data[BYTEIDX];                 \
 315       int len;                                                               \
 316                                                                              \
 317       OUTPUT = STRING_CHAR_AND_LENGTH (ptr, 0, len);                         \
 318       BYTEIDX += len;                                                        \
 319       CHARIDX++;                                                             \
 320     }                                                                        \
 321   else
 322
 323
 324 /* Like FETCH_STRING_CHAR_ADVANCE but fetch character from the current
 325    buffer.  */
 326
 327 #define FETCH_CHAR_ADVANCE(OUTPUT, CHARIDX, BYTEIDX)            \
 328   if (1)                                                        \
 329     {                                                           \
 330       CHARIDX++;                                                \
 331       if (!NILP (current_buffer->enable_multibyte_characters))  \
 332         {                                                       \
 333           unsigned char *ptr = BYTE_POS_ADDR (BYTEIDX);         \
 334           int len;                                              \
 335                                                                 \
 336           OUTPUT= STRING_CHAR_AND_LENGTH (ptr, 0, len);         \
 337           BYTEIDX += len;                                       \
 338         }                                                       \
 339       else                                                      \
 340         {                                                       \
 341           OUTPUT = *(BYTE_POS_ADDR (BYTEIDX));                  \
 342           BYTEIDX++;                                            \
 343         }                                                       \
 344     }                                                           \
 345   else
 346
 347
 348 /* Like FETCH_CHAR_ADVANCE but assumes STRING is multibyte.  */
 349
 350 #define FETCH_CHAR_ADVANCE_NO_CHECK(OUTPUT, CHARIDX, BYTEIDX)   \
 351   if (1)                                                        \
 352     {                                                           \
 353       unsigned char *ptr = BYTE_POS_ADDR (BYTEIDX);             \
 354       int len;                                                  \
 355                                                                 \
 356       OUTPUT= STRING_CHAR_AND_LENGTH (ptr, 0, len);             \
 357       BYTEIDX += len;                                           \
 358       CHARIDX++;                                                \
 359     }                                                           \
 360   else
 361
 362
 363 /* Increase the buffer byte position POS_BYTE of the current buffer to
 364    the next character boundary.  No range checking of POS.  */
 365
 366 #define INC_POS(pos_byte)                               \
 367   do {                                                  \
 368     unsigned char *p = BYTE_POS_ADDR (pos_byte);        \
 369     pos_byte += BYTES_BY_CHAR_HEAD (*p);                \
 370   } while (0)
 371
 372
 373 /* Decrease the buffer byte position POS_BYTE of the current buffer to
 374    the previous character boundary.  No range checking of POS.  */
 375
 376 #define DEC_POS(pos_byte)                       \
 377   do {                                          \
 378     unsigned char *p;                           \
 379                                                 \
 380     pos_byte--;                                 \
 381     if (pos_byte < GPT_BYTE)                    \
 382       p = BEG_ADDR + pos_byte - 1;              \
 383     else                                        \
 384       p = BEG_ADDR + GAP_SIZE + pos_byte - 1;   \
 385     while (!CHAR_HEAD_P (*p))                   \
 386       {                                         \
 387         p--;                                    \
 388         pos_byte--;                             \
 389       }                                         \
 390   } while (0)
 391
 392 /* Increment both CHARPOS and BYTEPOS, each in the appropriate way.  */
 393
 394 #define INC_BOTH(charpos, bytepos)                              \
 395   do                                                            \
 396     {                                                           \
 397       (charpos)++;                                              \
 398       if (NILP (current_buffer->enable_multibyte_characters))   \
 399         (bytepos)++;                                            \
 400       else                                                      \
 401         INC_POS ((bytepos));                                    \
 402     }                                                           \
 403   while (0)
 404
 405
 406 /* Decrement both CHARPOS and BYTEPOS, each in the appropriate way.  */
 407
 408 #define DEC_BOTH(charpos, bytepos)                              \
 409   do                                                            \
 410     {                                                           \
 411       (charpos)--;                                              \
 412       if (NILP (current_buffer->enable_multibyte_characters))   \
 413         (bytepos)--;                                            \
 414       else                                                      \
 415         DEC_POS ((bytepos));                                    \
 416     }                                                           \
 417   while (0)
 418
 419
 420 /* Increase the buffer byte position POS_BYTE of the current buffer to
 421    the next character boundary.  This macro relies on the fact that
 422    *GPT_ADDR and *Z_ADDR are always accessible and the values are
 423    '\0'.  No range checking of POS_BYTE.  */
 424
 425 #define BUF_INC_POS(buf, pos_byte)                              \
 426   do {                                                          \
 427     unsigned char *p = BUF_BYTE_ADDRESS (buf, pos_byte);        \
 428     pos_byte += BYTES_BY_CHAR_HEAD (*p);                        \
 429   } while (0)
 430
 431
 432 /* Decrease the buffer byte position POS_BYTE of the current buffer to
 433    the previous character boundary.  No range checking of POS_BYTE.  */
 434
 435 #define BUF_DEC_POS(buf, pos_byte)                                      \
 436   do {                                                                  \
 437     unsigned char *p;                                                   \
 438     pos_byte--;                                                         \
 439     if (pos_byte < BUF_GPT_BYTE (buf))                                  \
 440       p = BUF_BEG_ADDR (buf) + pos_byte - 1;                            \
 441     else                                                                \
 442       p = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos_byte - 1;       \
 443     while (!CHAR_HEAD_P (*p))                                           \
 444       {                                                                 \
 445         p--;                                                            \
 446         pos_byte--;                                                     \
 447       }                                                                 \
 448   } while (0)
 449
 450
 451 #define MAYBE_UNIFY_CHAR(c)                             \
 452   if (CHAR_TABLE_P (Vchar_unify_table))                 \
 453     {                                                   \
 454       Lisp_Object val;                                  \
 455       int unified;                                      \
 456                                                         \
 457       val = CHAR_TABLE_REF (Vchar_unify_table, c);      \
 458       if (SYMBOLP (val))                                \
 459         {                                               \
 460           Funify_charset (val, Qnil);                   \
 461           val = CHAR_TABLE_REF (Vchar_unify_table, c);  \
 462         }                                               \
 463       if ((unified = XINT (val)) >= 0)                  \
 464         c = unified;                                    \
 465     }                                                   \
 466   else
 467
 468 /* Return the width of ASCII character C.  The width is measured by
 469    how many columns occupied on the screen when displayed in the
 470    current buffer.  */
 471
 472 #define ASCII_CHAR_WIDTH(c)                                             \
 473   (c < 0x20                                                             \
 474    ? (c == '\t'                                                         \
 475       ? XFASTINT (current_buffer->tab_width)                            \
 476       : (c == '\n' ? 0 : (NILP (current_buffer->ctl_arrow) ? 4 : 2)))   \
 477    : (c < 0x7f                                                          \
 478       ? 1                                                               \
 479       : ((NILP (current_buffer->ctl_arrow) ? 4 : 2))))
 480
 481 /* Return the width of character C.  The width is measured by how many
 482    columns occupied on the screen when displayed in the current
 483    buffer.  */
 484
 485 #define CHAR_WIDTH(c)           \
 486   (ASCII_CHAR_P (c)             \
 487    ? ASCII_CHAR_WIDTH (c)       \
 488    : XINT (CHAR_TABLE_REF (Vchar_width_table, c)))
 489
 490 extern int char_string_with_unification P_ ((int, unsigned char *));
 491 extern int string_char_with_unification P_ ((unsigned char *,
 492                                              unsigned char **, int *));
 493
 494 extern int translate_char P_ ((Lisp_Object, int c));
 495 extern int char_printable_p P_ ((int c));
 496 extern void parse_str_as_multibyte P_ ((unsigned char *, int, int *, int *));
 497 extern int parse_str_to_multibyte P_ ((unsigned char *, int));
 498 extern int str_as_multibyte P_ ((unsigned char *, int, int, int *));
 499 extern int str_to_multibyte P_ ((unsigned char *, int, int));
 500 extern int str_as_unibyte P_ ((unsigned char *, int));
 501 extern int strwidth P_ ((unsigned char *, int));
 502 extern int c_string_width P_ ((unsigned char *, int, int, int *, int *));
 503 extern int lisp_string_width P_ ((Lisp_Object, int, int *, int *));
 504
 505 extern Lisp_Object Vprintable_chars;
 506
 507 extern Lisp_Object Qcharacterp, Qauto_fill_chars;
 508 extern Lisp_Object Vtranslation_table_vector;
 509 extern Lisp_Object Vchar_width_table;
 510 extern Lisp_Object Vchar_direction_table;
 511 extern Lisp_Object Vchar_unify_table;
 512
 513 extern Lisp_Object string_escape_byte8 P_ ((Lisp_Object));
 514
 515 /* Return a translation table of id number ID.  */
 516 #define GET_TRANSLATION_TABLE(id) \
 517   (XCDR(XVECTOR(Vtranslation_table_vector)->contents[(id)]))
 518
 519 /* A char-table for characters which may invoke auto-filling.  */
 520 extern Lisp_Object Vauto_fill_chars;
 521
 522 /* Copy LEN bytes from FROM to TO.  This macro should be used only
 523    when a caller knows that LEN is short and the obvious copy loop is
 524    faster than calling bcopy which has some overhead.  Copying a
 525    multibyte sequence of a character is the typical case.  */
 526
 527 #define BCOPY_SHORT(from, to, len)              \
 528   do {                                          \
 529     int i = len;                                \
 530     unsigned char *from_p = from, *to_p = to;   \
 531     while (i--) *to_p++ = *from_p++;            \
 532   } while (0)
 533
 534 #define DEFSYM(sym, name)       \
 535   do { (sym) = intern ((name)); staticpro (&(sym)); } while (0)
 536
 537 #endif /* EMACS_CHARACTER_H */