src/lisp.h

   1 /* Fundamental definitions for GNU Emacs Lisp interpreter.
   2    Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* Define the fundamental Lisp data structures */
  22
  23 /* This is the set of Lisp data types */
  24
  25 enum Lisp_Type
  26   {
  27     /* Integer.  XINT(obj) is the integer value. */
  28     Lisp_Int,
  29
  30     /* Symbol.  XSYMBOL (object) points to a struct Lisp_Symbol. */
  31     Lisp_Symbol,
  32
  33     /* Marker (buffer ptr).  XMARKER(object) points to a struct Lisp_Marker. */
  34     Lisp_Marker,
  35
  36     /* String.  XSTRING (object) points to a struct Lisp_String.
  37        The length of the string, and its contents, are stored therein. */
  38     Lisp_String,
  39
  40     /* Vector of Lisp objects.  XVECTOR(object) points to a struct Lisp_Vector.
  41        The length of the vector, and its contents, are stored therein. */
  42     Lisp_Vector,
  43
  44     /* Cons.  XCONS (object) points to a struct Lisp_Cons. */
  45     Lisp_Cons,
  46
  47     /* Byte-compiled function.  A vector of 4 to 6 elements which are the
  48        arglist, bytecode-string, constant vector, stack size,
  49        (optional) doc string, and (optional) interactive spec.  */
  50     Lisp_Compiled,
  51
  52     /* Editor buffer.  XBUFFER(obj) points to a struct buffer.  */
  53     Lisp_Buffer,
  54
  55     /* Built-in function.  XSUBR(obj) points to a struct Lisp_Subr
  56        which describes how to call the function, and its documentation,
  57        as well as pointing to the code. */
  58     Lisp_Subr,
  59
  60     /* Internal value return by subroutines of read.
  61        The user never sees this data type.
  62        Its value is just a number. */
  63     Lisp_Internal,
  64
  65     /* Forwarding pointer to an int variable.
  66        This is allowed only in the value cell of a symbol,
  67        and it means that the symbol's value really lives in the
  68        specified int variable.
  69        XINTPTR(obj) points to the int variable. */
  70     Lisp_Intfwd,
  71
  72     /* Boolean forwarding pointer to an int variable.
  73        This is like Lisp_Intfwd except that the ostensible
  74        "value" of the symbol is t if the int variable is nonzero,
  75        nil if it is zero.  XINTPTR(obj) points to the int variable. */
  76     Lisp_Boolfwd,
  77
  78     /* Object describing a connection to a subprocess.
  79        It points to storage of type  struct Lisp_Process  */
  80     Lisp_Process,
  81
  82     /* Forwarding pointer to a Lisp_Object variable.
  83        This is allowed only in the value cell of a symbol,
  84        and it means that the symbol's value really lives in the
  85        specified variable.
  86        XOBJFWD(obj) points to the Lisp_Object variable. */
  87     Lisp_Objfwd,
  88
  89     /* Pointer to a vector-like object describing a display screen
  90        on which Emacs can display a window hierarchy.  */
  91     Lisp_Screen,
  92
  93     /* Used when a FILE * value needs to be passed
  94        in an argument of type Lisp_Object.
  95        You must do *(FILE **) XPNTR(obj) to get the value.
  96        The user will never see this data type. */
  97     Lisp_Internal_Stream,
  98
  99     /* Used in a symbol value cell when the symbol's value is per-buffer.
 100         The actual contents are a cons cell which starts a list like this:
 101         (REALVALUE BUFFER CURRENT-ALIST-ELEMENT . DEFAULT-VALUE)).
 102
 103         BUFFER is the last buffer for which this symbol's value was
 104         made up to date.
 105
 106         CURRENT-ALIST-ELEMENT is a pointer to an element of BUFFER's
 107         b_local_var_alist, that being the element whose car is this variable.
 108         Or it can be a pointer to the (CURRENT-ALIST-ELEMENT . DEFAULT-VALUE), if BUFFER
 109         does not have an element in its alist for this variable
 110         (that is, if BUFFER sees the default value of this variable).
 111
 112         If we want to examine or set the value and BUFFER is current,
 113         we just examine or set REALVALUE.
 114         If BUFFER is not current, we store the current REALVALUE value into
 115         CURRENT-ALIST-ELEMENT, then find the appropriate alist element for
 116         the buffer now current and set up CURRENT-ALIST-ELEMENT.
 117         Then we set REALVALUE out of that element, and store into BUFFER.
 118
 119         If we are setting the variable and the current buffer does not have
 120         an alist entry for this variable, an alist entry is created.
 121
 122         Note that REALVALUE can be a forwarding pointer.
 123         Each time it is examined or set, forwarding must be done.  */
 124     Lisp_Buffer_Local_Value,
 125
 126     /* Like Lisp_Buffer_Local_Value with one difference:
 127         merely setting the variable while some buffer is current
 128         does not cause that buffer to have its own local value of this variable.
 129         Only make-local-variable does that.  */
 130     Lisp_Some_Buffer_Local_Value,
 131
 132
 133     /* Like Lisp_Objfwd except that value lives in a slot
 134        in the current buffer.  Value is byte index of slot within buffer */
 135     Lisp_Buffer_Objfwd,
 136
 137     /* In symbol value cell, means var is unbound.
 138        In symbol function cell, means function name is undefined. */
 139     Lisp_Void,
 140
 141     /* Window used for Emacs display.
 142        Data inside looks like a Lisp_Vector.  */
 143     Lisp_Window,
 144
 145     /* Used by save,set,restore-window-configuration */
 146     Lisp_Window_Configuration
 147
 148 #ifdef LISP_FLOAT_TYPE
 149       ,
 150     Lisp_Float
 151 #endif /* LISP_FLOAT_TYPE */
 152   };
 153
 154 #ifndef NO_UNION_TYPE
 155
 156 #ifndef BIG_ENDIAN
 157
 158 /* Definition of Lisp_Object for little-endian machines.  */
 159
 160 typedef
 161 union Lisp_Object
 162   {
 163     /* Used for comparing two Lisp_Objects;
 164        also, positive integers can be accessed fast this way. */
 165     int i;
 166
 167     struct
 168       {
 169         int val: 24;
 170         char type;
 171       } s;
 172     struct
 173       {
 174         unsigned int val: 24;
 175         char type;
 176       } u;
 177     struct
 178       {
 179         unsigned int val: 24;
 180         enum Lisp_Type type: 7;
 181         /* The markbit is not really part of the value of a Lisp_Object,
 182            and is always zero except during garbage collection.  */
 183         unsigned int markbit: 1;
 184       } gu;
 185   }
 186 Lisp_Object;
 187
 188 #else /* If BIG_ENDIAN */
 189
 190 typedef
 191 union Lisp_Object
 192   {
 193     /* Used for comparing two Lisp_Objects;
 194        also, positive integers can be accessed fast this way. */
 195     int i;
 196
 197     struct
 198       {
 199         char type;
 200         int val: 24;
 201       } s;
 202     struct
 203       {
 204         char type;
 205         unsigned int val: 24;
 206       } u;
 207     struct
 208       {
 209         /* The markbit is not really part of the value of a Lisp_Object,
 210            and is always zero except during garbage collection.  */
 211         unsigned int markbit: 1;
 212         enum Lisp_Type type: 7;
 213         unsigned int val: 24;
 214       } gu;
 215   }
 216 Lisp_Object;
 217
 218 #endif /* BIG_ENDIAN */
 219
 220 #endif /* NO_UNION_TYPE */
 221
 222
 223 /* If union type is not wanted, define Lisp_Object as just a number
 224    and define the macros below to extract fields by shifting */
 225
 226 #ifdef NO_UNION_TYPE
 227
 228 #define Lisp_Object int
 229
 230 /* These values are overridden by the m- file on some machines.  */
 231 #ifndef VALBITS
 232 #define VALBITS 24
 233 #endif
 234
 235 #ifndef GCTYPEBITS
 236 #define GCTYPEBITS 7
 237 #endif
 238
 239 #ifndef VALMASK
 240 #define VALMASK ((1<<VALBITS) - 1)
 241 #endif
 242 #define GCTYPEMASK ((1<<GCTYPEBITS) - 1)
 243 #define MARKBIT (1 << (VALBITS + GCTYPEBITS))
 244
 245 #endif /* NO_UNION_TYPE */
 246 \f
 247 /* These macros extract various sorts of values from a Lisp_Object.
 248  For example, if tem is a Lisp_Object whose type is Lisp_Cons,
 249  XCONS (tem) is the struct Lisp_Cons * pointing to the memory for that cons. */
 250
 251 #ifdef NO_UNION_TYPE
 252
 253 /* One need to override this if there must be high bits set in data space
 254    (doing the result of the below & ((1 << (GCTYPE + 1)) - 1) would work
 255     on all machines, but would penalise machines which don't need it)
 256  */
 257 #ifndef XTYPE
 258 #define XTYPE(a) ((enum Lisp_Type) ((a) >> VALBITS))
 259 #endif
 260
 261 #ifndef XSETTYPE
 262 #define XSETTYPE(a, b) ((a)  =  XUINT (a) | ((int)(b) << VALBITS))
 263 #endif
 264
 265 /* Use XFASTINT for fast retrieval and storage of integers known
 266   to be positive.  This takes advantage of the fact that Lisp_Int is 0.  */
 267 #define XFASTINT(a) (a)
 268
 269 /* Extract the value of a Lisp_Object as a signed integer.  */
 270
 271 #ifndef XINT   /* Some machines need to do this differently.  */
 272 #define XINT(a) (((a) << INTBITS-VALBITS) >> INTBITS-VALBITS)
 273 #endif
 274
 275 /* Extract the value as an unsigned integer.  This is a basis
 276    for extracting it as a pointer to a structure in storage.  */
 277
 278 #ifndef XUINT
 279 #define XUINT(a) ((a) & VALMASK)
 280 #endif
 281
 282 #ifndef XPNTR
 283 #ifdef HAVE_SHM
 284 /* In this representation, data is found in two widely separated segments.  */
 285 extern int pure_size;
 286 #define XPNTR(a) \
 287   (XUINT (a) | (XUINT (a) > pure_size ? DATA_SEG_BITS : PURE_SEG_BITS))
 288 #else /* not HAVE_SHM */
 289 #ifdef DATA_SEG_BITS
 290 /* This case is used for the rt-pc.
 291    In the diffs I was given, it checked for ptr = 0
 292    and did not adjust it in that case.
 293    But I don't think that zero should ever be found
 294    in a Lisp object whose data type says it points to something.  */
 295 #define XPNTR(a) (XUINT (a) | DATA_SEG_BITS)
 296 #else
 297 #define XPNTR(a) XUINT (a)
 298 #endif
 299 #endif /* not HAVE_SHM */
 300 #endif /* no XPNTR */
 301
 302 #ifndef XSETINT
 303 #define XSETINT(a, b)  ((a) = ((a) & ~VALMASK) |  ((b) & VALMASK))
 304 #endif
 305
 306 #ifndef XSETUINT
 307 #define XSETUINT(a, b) XSETINT (a, b)
 308 #endif
 309
 310 #ifndef XSETPNTR
 311 #define XSETPNTR(a, b) XSETINT (a, b)
 312 #endif
 313
 314 #ifndef XSET
 315 #define XSET(var, type, ptr) \
 316    ((var) = ((int)(type) << VALBITS) + ((int) (ptr) & VALMASK))
 317 #endif
 318
 319 /* During garbage collection, XGCTYPE must be used for extracting types
 320  so that the mark bit is ignored.  XMARKBIT accesses the markbit.
 321  Markbits are used only in particular slots of particular structure types.
 322  Other markbits are always zero.
 323  Outside of garbage collection, all mark bits are always zero.  */
 324
 325 #ifndef XGCTYPE
 326 #define XGCTYPE(a) ((enum Lisp_Type) (((a) >> VALBITS) & GCTYPEMASK))
 327 #endif
 328
 329 #if VALBITS + GCTYPEBITS == INTBITS - 1
 330 /* Make XMARKBIT faster if mark bit is sign bit.  */
 331 #ifndef XMARKBIT
 332 #define XMARKBIT(a) ((a) < 0)
 333 #endif
 334 #endif /* markbit is sign bit */
 335
 336 #ifndef XMARKBIT
 337 #define XMARKBIT(a) ((a) & MARKBIT)
 338 #endif
 339
 340 #ifndef XSETMARKBIT
 341 #define XSETMARKBIT(a,b) ((a) = ((a) & ~MARKBIT) | ((b) ? MARKBIT : 0))
 342 #endif
 343
 344 #ifndef XMARK
 345 #define XMARK(a) ((a) |= MARKBIT)
 346 #endif
 347
 348 #ifndef XUNMARK
 349 #define XUNMARK(a) ((a) &= ~MARKBIT)
 350 #endif
 351
 352 #endif /* NO_UNION_TYPE */
 353
 354 #ifndef NO_UNION_TYPE
 355
 356 #define XTYPE(a) ((enum Lisp_Type) (a).u.type)
 357 #define XSETTYPE(a, b) ((a).u.type = (char) (b))
 358
 359 /* Use XFASTINT for fast retrieval and storage of integers known
 360   to be positive.  This takes advantage of the fact that Lisp_Int is 0.  */
 361 #define XFASTINT(a) ((a).i)
 362
 363 #ifdef EXPLICIT_SIGN_EXTEND
 364 /* Make sure we sign-extend; compilers have been known to fail to do so.  */
 365 #define XINT(a) (((a).i << 8) >> 8)
 366 #else
 367 #define XINT(a) ((a).s.val)
 368 #endif /* EXPLICIT_SIGN_EXTEND */
 369
 370 #define XUINT(a) ((a).u.val)
 371 #define XPNTR(a) ((a).u.val)
 372 #define XSETINT(a, b) ((a).s.val = (int) (b))
 373 #define XSETUINT(a, b) ((a).s.val = (int) (b))
 374 #define XSETPNTR(a, b) ((a).s.val = (int) (b))
 375
 376 #define XSET(var, vartype, ptr) \
 377    (((var).s.type = ((char) (vartype))), ((var).s.val = ((int) (ptr))))
 378
 379 /* During garbage collection, XGCTYPE must be used for extracting types
 380  so that the mark bit is ignored.  XMARKBIT access the markbit.
 381  Markbits are used only in particular slots of particular structure types.
 382  Other markbits are always zero.
 383  Outside of garbage collection, all mark bits are always zero.  */
 384
 385 #define XGCTYPE(a) ((a).gu.type)
 386 #define XMARKBIT(a) ((a).gu.markbit)
 387 #define XSETMARKBIT(a,b) (XMARKBIT(a) = (b))
 388 #define XMARK(a) (XMARKBIT(a) = 1)
 389 #define XUNMARK(a) (XMARKBIT(a) = 0)
 390
 391 #endif /* NO_UNION_TYPE */
 392
 393
 394 #define XCONS(a) ((struct Lisp_Cons *) XPNTR(a))
 395 #define XBUFFER(a) ((struct buffer *) XPNTR(a))
 396 #define XVECTOR(a) ((struct Lisp_Vector *) XPNTR(a))
 397 #define XSUBR(a) ((struct Lisp_Subr *) XPNTR(a))
 398 #define XSTRING(a) ((struct Lisp_String *) XPNTR(a))
 399 #define XSYMBOL(a) ((struct Lisp_Symbol *) XPNTR(a))
 400 #define XFUNCTION(a) ((Lisp_Object (*)()) XPNTR(a))
 401 #define XMARKER(a) ((struct Lisp_Marker *) XPNTR(a))
 402 #define XOBJFWD(a) ((Lisp_Object *) XPNTR(a))
 403 #define XINTPTR(a) ((int *) XPNTR(a))
 404 #define XWINDOW(a) ((struct window *) XPNTR(a))
 405 #define XPROCESS(a) ((struct Lisp_Process *) XPNTR(a))
 406 #define XFLOAT(a) ((struct Lisp_Float *) XPNTR(a))
 407
 408 #define XSETCONS(a, b) XSETPNTR(a, (int) (b))
 409 #define XSETBUFFER(a, b) XSETPNTR(a, (int) (b))
 410 #define XSETVECTOR(a, b) XSETPNTR(a, (int) (b))
 411 #define XSETSUBR(a, b) XSETPNTR(a, (int) (b))
 412 #define XSETSTRING(a, b) XSETPNTR(a, (int) (b))
 413 #define XSETSYMBOL(a, b) XSETPNTR(a, (int) (b))
 414 #define XSETFUNCTION(a, b) XSETPNTR(a, (int) (b))
 415 #define XSETMARKER(a, b) XSETPNTR(a, (int) (b))
 416 #define XSETOBJFWD(a, b) XSETPNTR(a, (int) (b))
 417 #define XSETINTPTR(a, b) XSETPNTR(a, (int) (b))
 418 #define XSETWINDOW(a, b) XSETPNTR(a, (int) (b))
 419 #define XSETPROCESS(a, b) XSETPNTR(a, (int) (b))
 420 #define XSETFLOAT(a, b) XSETPNTR(a, (int) (b))
 421 \f
 422 /* In a cons, the markbit of the car is the gc mark bit */
 423
 424 struct Lisp_Cons
 425   {
 426     Lisp_Object car, cdr;
 427   };
 428
 429 /* Like a cons, but records info on where the text lives that it was read from */
 430 /* This is not really in use now */
 431
 432 struct Lisp_Buffer_Cons
 433   {
 434     Lisp_Object car, cdr;
 435     struct buffer *buffer;
 436     int bufpos;
 437   };
 438
 439 /* In a string or vector, the sign bit of the `size' is the gc mark bit */
 440
 441 struct Lisp_String
 442   {
 443     int size;
 444     unsigned char data[1];
 445   };
 446
 447 struct Lisp_Vector
 448   {
 449     int size;
 450     struct Lisp_Vector *next;
 451     Lisp_Object contents[1];
 452   };
 453
 454 /* In a symbol, the markbit of the plist is used as the gc mark bit */
 455
 456 struct Lisp_Symbol
 457   {
 458     struct Lisp_String *name;
 459     Lisp_Object value;
 460     Lisp_Object function;
 461     Lisp_Object plist;
 462     struct Lisp_Symbol *next;   /* -> next symbol in this obarray bucket */
 463   };
 464
 465 struct Lisp_Subr
 466   {
 467     Lisp_Object (*function) ();
 468     short min_args, max_args;
 469     char *symbol_name;
 470     char *prompt;
 471     char *doc;
 472   };
 473
 474 /* In a marker, the markbit of the chain field is used as the gc mark bit */
 475
 476 struct Lisp_Marker
 477   {
 478     struct buffer *buffer;
 479     Lisp_Object chain;
 480     int bufpos;
 481     int modified;
 482   };
 483
 484 #ifdef LISP_FLOAT_TYPE
 485 /* Optional Lisp floating point type */
 486 struct Lisp_Float
 487   {
 488     Lisp_Object type;           /* essentially used for mark-bit
 489                                    and chaining when on free-list */
 490     double data;
 491   };
 492 #endif /* LISP_FLOAT_TYPE */
 493
 494 /* A character, declared with the following typedef, is a member
 495    of some character set associated with the current buffer. */
 496 typedef unsigned char UCHAR;
 497
 498 /* Meanings of slots in a Lisp_Compiled:  */
 499
 500 #define COMPILED_ARGLIST 0
 501 #define COMPILED_BYTECODE 1
 502 #define COMPILED_CONSTANTS 2
 503 #define COMPILED_STACK_DEPTH 3
 504 #define COMPILED_DOC_STRING 4
 505 #define COMPILED_INTERACTIVE 5
 506 \f
 507 /* Data type checking */
 508
 509 #ifdef NULL
 510 #undef NULL
 511 #endif
 512 #define NILP(x)  (XFASTINT (x) == XFASTINT (Qnil))
 513
 514 /* #define LISTP(x) (XTYPE ((x)) == Lisp_Cons)*/
 515 #define CONSP(x) (XTYPE ((x)) == Lisp_Cons)
 516 #define EQ(x, y) (XFASTINT (x) == XFASTINT (y))
 517
 518 #define CHECK_LIST(x, i) \
 519   { if ((XTYPE ((x)) != Lisp_Cons) && !NILP (x)) x = wrong_type_argument (Qlistp, (x)); }
 520
 521 #define CHECK_STRING(x, i) \
 522   { if (XTYPE ((x)) != Lisp_String) x = wrong_type_argument (Qstringp, (x)); }
 523
 524 #define CHECK_CONS(x, i) \
 525   { if (XTYPE ((x)) != Lisp_Cons) x = wrong_type_argument (Qconsp, (x)); }
 526
 527 #define CHECK_SYMBOL(x, i) \
 528   { if (XTYPE ((x)) != Lisp_Symbol) x = wrong_type_argument (Qsymbolp, (x)); }
 529
 530 #define CHECK_VECTOR(x, i) \
 531   { if (XTYPE ((x)) != Lisp_Vector) x = wrong_type_argument (Qvectorp, (x)); }
 532
 533 #define CHECK_BUFFER(x, i) \
 534   { if (XTYPE ((x)) != Lisp_Buffer) x = wrong_type_argument (Qbufferp, (x)); }
 535
 536 #define CHECK_WINDOW(x, i) \
 537   { if (XTYPE ((x)) != Lisp_Window) x = wrong_type_argument (Qwindowp, (x)); }
 538
 539 #define CHECK_PROCESS(x, i) \
 540   { if (XTYPE ((x)) != Lisp_Process) x = wrong_type_argument (Qprocessp, (x)); }
 541
 542 #define CHECK_NUMBER(x, i) \
 543   { if (XTYPE ((x)) != Lisp_Int) x = wrong_type_argument (Qintegerp, (x)); }
 544
 545 #define CHECK_NATNUM(x, i) \
 546   { if (XTYPE ((x)) != Lisp_Int || XINT ((x)) < 0)      \
 547       x = wrong_type_argument (Qnatnump, (x)); }
 548
 549 #define CHECK_MARKER(x, i) \
 550   { if (XTYPE ((x)) != Lisp_Marker) x = wrong_type_argument (Qmarkerp, (x)); }
 551
 552 #define CHECK_NUMBER_COERCE_MARKER(x, i) \
 553   { if (XTYPE ((x)) == Lisp_Marker) XFASTINT (x) = marker_position (x); \
 554     else if (XTYPE ((x)) != Lisp_Int) x = wrong_type_argument (Qinteger_or_marker_p, (x)); }
 555
 556 #ifdef LISP_FLOAT_TYPE
 557
 558 #ifndef DBL_DIG
 559 #define DBL_DIG 20
 560 #endif
 561
 562 #define XFLOATINT(n) extract_float((n))
 563
 564 #define CHECK_FLOAT(x, i)               \
 565 { if (XTYPE (x) != Lisp_Float)  \
 566     x = wrong_type_argument (Qfloatp, (x)); }
 567
 568 #define CHECK_NUMBER_OR_FLOAT(x, i)     \
 569 { if (XTYPE (x) != Lisp_Float && XTYPE (x) != Lisp_Int) \
 570     x = wrong_type_argument (Qinteger_or_floatp, (x)); }
 571
 572 #define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER(x, i) \
 573 { if (XTYPE (x) == Lisp_Marker) XFASTINT (x) = marker_position (x);     \
 574   else if (XTYPE (x) != Lisp_Int && XTYPE (x) != Lisp_Float)            \
 575     x = wrong_type_argument (Qinteger_or_float_or_marker_p, (x)); }
 576
 577 #else  /* Not LISP_FLOAT_TYPE */
 578
 579 #define CHECK_NUMBER_OR_FLOAT CHECK_NUMBER
 580
 581 #define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER CHECK_NUMBER_COERCE_MARKER
 582
 583 #define XFLOATINT(n) XINT((n))
 584 #endif /* LISP_FLOAT_TYPE */
 585
 586 /* Cast pointers to this type to compare them.  Some machines want int.  */
 587 #ifndef PNTR_COMPARISON_TYPE
 588 #define PNTR_COMPARISON_TYPE unsigned int
 589 #endif
 590 \f
 591 /* Define a built-in function for calling from Lisp.
 592  `lname' should be the name to give the function in Lisp,
 593     as a null-terminated C string.
 594  `fnname' should be the name of the function in C.
 595     By convention, it starts with F.
 596  `sname' should be the name for the C constant structure
 597     that records information on this function for internal use.
 598     By convention, it should be the same as `fnname' but with S instead of F.
 599     It's too bad that C macros can't compute this from `fnname'.
 600  `minargs' should be a number, the minimum number of arguments allowed.
 601  `maxargs' should be a number, the maximum number of arguments allowed,
 602     or else MANY or UNEVALLED.
 603     MANY means pass a vector of evaluated arguments,
 604          in the form of an integer number-of-arguments
 605          followed by the address of a vector of Lisp_Objects
 606          which contains the argument values.
 607     UNEVALLED means pass the list of unevaluated arguments
 608  `prompt' says how to read arguments for an interactive call.
 609     This can be zero or a C string.
 610     Zero means that interactive calls are not allowed.
 611     A string is interpreted in a hairy way:
 612      it should contain one line for each argument to be read, terminated by \n.
 613      The first character of the line controls the type of parsing:
 614        s  --  read a string.
 615        S  --  read a symbol.
 616        k  --  read a key sequence and return it as a string.
 617        a  --  read a function name (symbol) with completion.
 618        C  --  read a command name (symbol) with completion.
 619        v  --  read a variable name (symbol) with completion.
 620        b  --  read a buffer name (a string) with completion.
 621        B  --  buffer name, may be existing buffer or may not be.
 622        f  --  read a file name, file must exist.
 623        F  --  read a file name, file need not exist.
 624        n  --  read a number.
 625        c  --  read a character and return it as a number.
 626        p  --  use the numeric value of the prefix argument.
 627        P  --  use raw value of prefix - can be nil, -, (NUMBER) or NUMBER.
 628        x  --  read a Lisp object from the minibuffer.
 629        X  --  read a Lisp form from the minibuffer and use its value.
 630     A null string means call interactively with no arguments.
 631  `doc' is documentation for the user.
 632 */
 633
 634 #define DEFUN(lname, fnname, sname, minargs, maxargs, prompt, doc) \
 635   Lisp_Object fnname (); \
 636   struct Lisp_Subr sname = {fnname, minargs, maxargs, lname, prompt, 0}; \
 637   Lisp_Object fnname
 638
 639 /* defsubr (Sname);
 640  is how we define the symbol for function `name' at start-up time. */
 641 extern void defsubr ();
 642
 643 #define MANY -2
 644 #define UNEVALLED -1
 645
 646 extern void defvar_lisp ();
 647 extern void defvar_bool ();
 648 extern void defvar_int ();
 649
 650 /* Macros we use to define forwarded Lisp variables.
 651    These are used in the syms_of_FILENAME functions.  */
 652
 653 #define DEFVARLISP(lname, vname, doc) defvar_lisp (lname, vname)
 654 #define DEFVARBOOL(lname, vname, doc) defvar_bool (lname, vname)
 655 #define DEFVARINT(lname, vname, doc) defvar_int (lname, vname)
 656 #define DEFVARPERBUFFER(lname, vname, doc)  \
 657  defvar_per_buffer (lname, vname)
 658
 659 #define DEFVAR_LISP(lname, vname, doc) defvar_lisp (lname, vname)
 660 #define DEFVAR_LISP_NOPRO(lname, vname, doc) defvar_lisp_nopro (lname, vname)
 661 #define DEFVAR_BOOL(lname, vname, doc) defvar_bool (lname, vname)
 662 #define DEFVAR_INT(lname, vname, doc) defvar_int (lname, vname)
 663 #define DEFVAR_PER_BUFFER(lname, vname, doc)  \
 664  defvar_per_buffer (lname, vname)
 665 \f
 666 /* Structure for recording Lisp call stack for backtrace purposes */
 667
 668 struct specbinding
 669   {
 670     Lisp_Object symbol, old_value;
 671     Lisp_Object (*func) ();
 672     Lisp_Object unused;         /* Dividing by 16 is faster than by 12 */
 673   };
 674
 675 extern struct specbinding *specpdl;
 676 extern struct specbinding *specpdl_ptr;
 677 extern int specpdl_size;
 678
 679 struct handler
 680   {
 681     Lisp_Object handler;
 682     Lisp_Object var;
 683     int poll_suppress_count;    /* No error should exit a piece of code
 684                                    in which polling is suppressed.  */
 685     struct catchtag *tag;
 686     struct handler *next;
 687   };
 688
 689 extern struct handler *handlerlist;
 690
 691 extern struct catchtag *catchlist;
 692 extern struct backtrace *backtrace_list;
 693
 694 /* An address near the bottom of the stack.
 695    Tells GC how to save a copy of the stack.  */
 696 extern char *stack_bottom;
 697
 698 /* Check quit-flag and quit if it is non-nil. */
 699
 700 #define QUIT \
 701   if (!NILP (Vquit_flag) && NILP (Vinhibit_quit)) \
 702     { Vquit_flag = Qnil; Fsignal (Qquit, Qnil); }
 703
 704 /* Nonzero if ought to quit now.  */
 705
 706 #define QUITP (!NILP (Vquit_flag) && NILP (Vinhibit_quit))
 707 \f
 708 /* 1 if CH is upper case.  */
 709
 710 #define UPPERCASEP(CH) \
 711   (XSTRING (current_buffer->downcase_table)->data[CH] != (CH))
 712
 713 /* 1 if CH is lower case.  */
 714
 715 #define LOWERCASEP(CH) \
 716   (!UPPERCASEP (CH) \
 717    && XSTRING (current_buffer->upcase_table)->data[CH] != (CH))
 718
 719 /* 1 if CH is neither upper nor lower case.  */
 720
 721 #define NOCASEP(CH) (XSTRING (current_buffer->upcase_table)->data[CH] == (CH))
 722
 723 /* Upcase a character, or make no change if that cannot be done.  */
 724
 725 #define UPCASE(CH) \
 726   (XSTRING (current_buffer->downcase_table)->data[CH] == (CH) \
 727    ? UPCASE1 (CH) : (CH))
 728
 729 /* Upcase a character known to be not upper case.  */
 730
 731 #define UPCASE1(CH) (XSTRING (current_buffer->upcase_table)->data[CH])
 732
 733 /* Downcase a character, or make no change if that cannot be done. */
 734
 735 #define DOWNCASE(CH) (XSTRING (current_buffer->downcase_table)->data[CH])
 736
 737 /* Current buffer's map from characters to lower-case characters.  */
 738
 739 #define DOWNCASE_TABLE XSTRING (current_buffer->downcase_table)->data
 740
 741 /* Table mapping each char to the next char with the same lowercase version.
 742    This mapping is a no-op only for characters that don't have case.  */
 743 #define UPCASE_TABLE XSTRING (current_buffer->upcase_table)->data
 744
 745 extern Lisp_Object Vascii_downcase_table, Vascii_upcase_table;
 746 \f
 747 /* number of bytes of structure consed since last GC */
 748
 749 extern int consing_since_gc;
 750
 751 /* threshold for doing another gc */
 752
 753 extern int gc_cons_threshold;
 754
 755 /* Structure for recording stack slots that need marking */
 756
 757 /* This is a chain of structures, each of which points at a Lisp_Object variable
 758  whose value should be marked in garbage collection.
 759  Normally every link of the chain is an automatic variable of a function,
 760  and its `val' points to some argument or local variable of the function.
 761  On exit to the function, the chain is set back to the value it had on entry.
 762  This way, no link remains in the chain when the stack frame containing the link disappears.
 763
 764  Every function that can call Feval must protect in this fashion all
 765  Lisp_Object variables whose contents will be used again. */
 766
 767 extern struct gcpro *gcprolist;
 768
 769 struct gcpro
 770   {
 771     struct gcpro *next;
 772     Lisp_Object *var;           /* Address of first protected variable */
 773     int nvars;                  /* Number of consecutive protected variables */
 774   };
 775
 776 #define GCPRO1(varname) \
 777  {gcpro1.next = gcprolist; gcpro1.var = &varname; gcpro1.nvars = 1; \
 778   gcprolist = &gcpro1; }
 779
 780 #define GCPRO2(varname1, varname2) \
 781  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 782   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 783   gcprolist = &gcpro2; }
 784
 785 #define GCPRO3(varname1, varname2, varname3) \
 786  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 787   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 788   gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
 789   gcprolist = &gcpro3; }
 790
 791 #define GCPRO4(varname1, varname2, varname3, varname4) \
 792  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 793   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 794   gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
 795   gcpro4.next = &gcpro3; gcpro4.var = &varname4; gcpro4.nvars = 1; \
 796   gcprolist = &gcpro4; }
 797
 798 /* Call staticpro (&var) to protect static variable `var'. */
 799
 800 void staticpro();
 801
 802 #define UNGCPRO (gcprolist = gcpro1.next)
 803
 804 /* Evaluate expr, UNGCPRO, and then return the value of expr.  */
 805 #define RETURN_UNGCPRO(expr)            \
 806   do                                    \
 807     {                                   \
 808       Lisp_Object ret_ungc_val;         \
 809       ret_ungc_val = (expr);            \
 810       UNGCPRO;                          \
 811       return ret_ungc_val;              \
 812     }                                   \
 813   while (0)
 814 \f
 815 /* Defined in data.c */
 816 extern Lisp_Object Qnil, Qt, Qquote, Qlambda, Qsubr, Qunbound;
 817 extern Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
 818 extern Lisp_Object Qerror, Qquit, Qwrong_type_argument, Qargs_out_of_range;
 819 extern Lisp_Object Qvoid_variable, Qvoid_function;
 820 extern Lisp_Object Qsetting_constant, Qinvalid_read_syntax;
 821 extern Lisp_Object Qinvalid_function, Qwrong_number_of_arguments, Qno_catch;
 822 extern Lisp_Object Qend_of_file, Qarith_error;
 823 extern Lisp_Object Qbeginning_of_buffer, Qend_of_buffer, Qbuffer_read_only;
 824
 825 extern Lisp_Object Qintegerp, Qnatnump, Qsymbolp, Qlistp, Qconsp;
 826 extern Lisp_Object Qstringp, Qarrayp, Qsequencep, Qbufferp;
 827 extern Lisp_Object Qchar_or_string_p, Qmarkerp, Qvectorp;
 828 extern Lisp_Object Qinteger_or_marker_p, Qboundp, Qfboundp;
 829 extern Lisp_Object Qcdr;
 830
 831 #ifdef LISP_FLOAT_TYPE
 832 extern Lisp_Object Qfloatp, Qinteger_or_floatp, Qinteger_or_float_or_marker_p;
 833 #endif /* LISP_FLOAT_TYPE */
 834
 835 extern Lisp_Object Qscreenp;
 836
 837 extern Lisp_Object Feq (), Fnull (), Flistp (), Fconsp (), Fatom (), Fnlistp ();
 838 extern Lisp_Object Fintegerp (), Fnatnump (), Fsymbolp ();
 839 extern Lisp_Object Fvectorp (), Fstringp (), Farrayp (), Fsequencep ();
 840 extern Lisp_Object Fbufferp (), Fmarkerp (), Fsubrp (), Fchar_or_string_p ();
 841 extern Lisp_Object Finteger_or_marker_p ();
 842 #ifdef LISP_FLOAT_TYPE
 843 extern Lisp_Object Ffloatp(), Finteger_or_floatp();
 844 extern Lisp_Object Finteger_or_float_or_marker_p(), Ftruncate();
 845 #endif /* LISP_FLOAT_TYPE */
 846
 847 extern Lisp_Object Fcar (), Fcar_safe(), Fcdr (), Fcdr_safe();
 848 extern Lisp_Object Fsetcar (), Fsetcdr ();
 849 extern Lisp_Object Fboundp (), Ffboundp (), Fmakunbound (), Ffmakunbound ();
 850 extern Lisp_Object Fsymbol_function (), Fsymbol_plist (), Fsymbol_name ();
 851 extern Lisp_Object Ffset (), Fsetplist ();
 852 extern Lisp_Object Fsymbol_value (), find_symbol_value (), Fset ();
 853 extern Lisp_Object Fdefault_value (), Fset_default ();
 854
 855 extern Lisp_Object Faref (), Faset (), Farray_length ();
 856
 857 extern Lisp_Object Fstring_to_int (), Fint_to_string ();
 858 extern Lisp_Object Feqlsign (), Fgtr (), Flss (), Fgeq (), Fleq (), Fneq (), Fzerop ();
 859 extern Lisp_Object Fplus (), Fminus (), Ftimes (), Fquo (), Frem (), Fmax (), Fmin ();
 860 extern Lisp_Object Flogand (), Flogior (), Flogxor (), Flognot (), Flsh (), Fash ();
 861 extern Lisp_Object Fadd1 (), Fsub1 ();
 862
 863 extern Lisp_Object make_number ();
 864 extern void args_out_of_range ();
 865 extern void args_out_of_range_3 ();
 866 extern Lisp_Object wrong_type_argument ();
 867 #ifdef LISP_FLOAT_TYPE
 868 extern Lisp_Object Ffloat_to_int(), Fint_to_float();
 869 extern double extract_float();
 870 #endif /* LISP_FLOAT_TYPE */
 871
 872 /* Defined in fns.c */
 873 extern Lisp_Object Qstring_lessp;
 874 extern Lisp_Object Vfeatures;
 875 extern Lisp_Object Fidentity (), Frandom ();
 876 extern Lisp_Object Flength ();
 877 extern Lisp_Object Fappend (), Fconcat (), Fvconcat (), Fcopy_sequence ();
 878 extern Lisp_Object Fsubstring ();
 879 extern Lisp_Object Fnthcdr (), Fmemq (), Fassq (), Fassoc ();
 880 extern Lisp_Object Frassq (), Fdelq (), Fsort ();
 881 extern Lisp_Object Freverse (), Fnreverse (), Fget (), Fput (), Fequal ();
 882 extern Lisp_Object Ffillarray (), Fnconc (), Fmapcar (), Fmapconcat ();
 883 extern Lisp_Object Fy_or_n_p (), do_yes_or_no_p ();
 884 extern Lisp_Object Ffeaturep (), Frequire () , Fprovide ();
 885 extern Lisp_Object concat2 (), nconc2 ();
 886 extern Lisp_Object assq_no_quit ();
 887
 888 /* Defined in alloc.c */
 889 extern Lisp_Object Vpurify_flag;
 890 extern Lisp_Object Fcons (), Flist(), Fmake_list ();
 891 extern Lisp_Object Fmake_vector (), Fvector (), Fmake_symbol (), Fmake_marker ();
 892 extern Lisp_Object Fmake_string (), build_string (), make_string ();
 893 extern Lisp_Object make_array (), make_uninit_string ();
 894 extern Lisp_Object Fpurecopy (), make_pure_string ();
 895 extern Lisp_Object pure_cons (), make_pure_vector ();
 896 extern Lisp_Object Fgarbage_collect ();
 897
 898 /* Defined in print.c */
 899 extern Lisp_Object Vprin1_to_string_buffer;
 900 extern Lisp_Object Fprin1 (), Fprin1_to_string (), Fprinc ();
 901 extern Lisp_Object Fterpri (), Fprint ();
 902 extern Lisp_Object Vstandard_output, Qstandard_output;
 903 extern Lisp_Object Qexternal_debugging_output;
 904 extern void temp_output_buffer_setup (), temp_output_buffer_show ();
 905 extern int print_level, print_escape_newlines;
 906 extern Lisp_Object Qprint_escape_newlines;
 907
 908 /* Defined in lread.c */
 909 extern Lisp_Object Qvariable_documentation, Qstandard_input;
 910 extern Lisp_Object Vobarray, Vstandard_input;
 911 extern Lisp_Object Fread (), Fread_from_string ();
 912 extern Lisp_Object Fintern (), Fintern_soft (), Fload ();
 913 extern Lisp_Object Fget_file_char (), Fread_char ();
 914 extern Lisp_Object Feval_current_buffer (), Feval_region ();
 915 extern Lisp_Object intern (), oblookup ();
 916
 917 /* Defined in eval.c */
 918 extern Lisp_Object Qautoload, Qexit, Qinteractive, Qcommandp, Qdefun, Qmacro;
 919 extern Lisp_Object Vinhibit_quit, Qinhibit_quit, Vquit_flag;
 920 extern Lisp_Object Vmocklisp_arguments, Qmocklisp, Qmocklisp_arguments;
 921 extern Lisp_Object Vautoload_queue;
 922 extern Lisp_Object Vrun_hooks;
 923 extern Lisp_Object Fand (), For (), Fif (), Fprogn (), Fprog1 (), Fprog2 ();
 924 extern Lisp_Object Fsetq (), Fquote ();
 925 extern Lisp_Object Fuser_variable_p (), Finteractive_p ();
 926 extern Lisp_Object Fdefun (), Flet (), FletX (), Fwhile ();
 927 extern Lisp_Object Fcatch (), Fthrow (), Funwind_protect ();
 928 extern Lisp_Object Fcondition_case (), Fsignal ();
 929 extern Lisp_Object Ffunction_type (), Fautoload (), Fcommandp ();
 930 extern Lisp_Object Feval (), Fapply (), Ffuncall ();
 931 extern Lisp_Object Fglobal_set (), Fglobal_value (), Fbacktrace ();
 932 extern Lisp_Object apply1 (), call0 (), call1 (), call2 (), call3 ();
 933 extern Lisp_Object apply_lambda ();
 934 extern Lisp_Object internal_catch ();
 935 extern Lisp_Object internal_condition_case ();
 936 extern Lisp_Object unbind_to ();
 937 extern void error ();
 938 extern Lisp_Object un_autoload ();
 939
 940 /* Defined in editfns.c */
 941 extern Lisp_Object Vprefix_arg, Qminus, Vcurrent_prefix_arg;
 942 extern Lisp_Object Fgoto_char ();
 943 extern Lisp_Object Fpoint_min_marker (), Fpoint_max_marker ();
 944 extern Lisp_Object Fpoint_min (), Fpoint_max ();
 945 extern Lisp_Object Fpoint (), Fpoint_marker (), Fmark_marker ();
 946 extern Lisp_Object Ffollowing_char (), Fprevious_char (), Fchar_after ();
 947 extern Lisp_Object Finsert ();
 948 extern Lisp_Object Feolp (), Feobp (), Fbolp (), Fbobp ();
 949 extern Lisp_Object Fformat (), format1 ();
 950 extern Lisp_Object Fbuffer_substring (), Fbuffer_string ();
 951 extern Lisp_Object Fstring_equal (), Fstring_lessp (), Fbuffer_substring_lessp ();
 952 extern Lisp_Object save_excursion_save (), save_restriction_save ();
 953 extern Lisp_Object save_excursion_restore (), save_restriction_restore ();
 954 extern Lisp_Object Fchar_to_string ();
 955
 956 /* defined in buffer.c */
 957 extern Lisp_Object Vbuffer_alist;
 958 extern Lisp_Object Fget_buffer (), Fget_buffer_create (), Fset_buffer ();
 959 extern Lisp_Object Fbarf_if_buffer_read_only ();
 960 extern Lisp_Object Fcurrent_buffer (), Fswitch_to_buffer (), Fpop_to_buffer ();
 961 extern Lisp_Object Fother_buffer ();
 962 extern struct buffer *all_buffers;
 963
 964 /* defined in marker.c */
 965
 966 extern Lisp_Object Fmarker_position (), Fmarker_buffer ();
 967 extern Lisp_Object Fcopy_marker ();
 968
 969 /* Defined in fileio.c */
 970
 971 extern Lisp_Object Qfile_error;
 972 extern Lisp_Object Ffile_name_as_directory ();
 973 extern Lisp_Object Fexpand_file_name (), Ffile_name_nondirectory ();
 974 extern Lisp_Object Fsubstitute_in_file_name ();
 975 extern Lisp_Object Ffile_symlink_p ();
 976
 977 /* Defined in abbrev.c */
 978
 979 extern Lisp_Object Vfundamental_mode_abbrev_table;
 980
 981 /* defined in search.c */
 982 extern Lisp_Object Fstring_match ();
 983 extern Lisp_Object Fscan_buffer ();
 984
 985 /* defined in minibuf.c */
 986
 987 extern Lisp_Object last_minibuf_string;
 988 extern Lisp_Object read_minibuf (), Fcompleting_read ();
 989 extern Lisp_Object Fread_from_minibuffer ();
 990 extern Lisp_Object Fread_variable (), Fread_buffer (), Fread_key_sequence ();
 991 extern Lisp_Object Fread_minibuffer (), Feval_minibuffer ();
 992 extern Lisp_Object Fread_string (), Fread_file_name ();
 993 extern Lisp_Object Fread_no_blanks_input ();
 994
 995 /* Defined in callint.c */
 996
 997 extern Lisp_Object Vcommand_history;
 998 extern Lisp_Object Qcall_interactively;
 999 extern Lisp_Object Fcall_interactively ();
1000 extern Lisp_Object Fprefix_numeric_value ();
1001
1002 /* defined in casefiddle.c */
1003
1004 extern Lisp_Object Fdowncase (), Fupcase (), Fcapitalize ();
1005
1006 /* defined in keyboard.c */
1007
1008 extern Lisp_Object Qdisabled;
1009 extern Lisp_Object Vhelp_form, Vtop_level;
1010 extern Lisp_Object Fdiscard_input (), Frecursive_edit ();
1011 extern Lisp_Object Fcommand_execute (), Finput_pending_p ();
1012
1013 /* defined in keymap.c */
1014
1015 extern Lisp_Object Qkeymap;
1016 extern Lisp_Object current_global_map;
1017 extern Lisp_Object Fkey_description (), Fsingle_key_description ();
1018 extern Lisp_Object Fwhere_is_internal ();
1019 extern Lisp_Object access_keymap (), store_in_keymap ();
1020 extern Lisp_Object get_keyelt (), get_keymap();
1021
1022 /* defined in indent.c */
1023 extern Lisp_Object Fvertical_motion (), Findent_to (), Fcurrent_column ();
1024
1025 /* defined in window.c */
1026 extern Lisp_Object Qwindowp;
1027 extern Lisp_Object Fget_buffer_window ();
1028 extern Lisp_Object Fsave_window_excursion ();
1029 extern Lisp_Object Fset_window_configuration (), Fcurrent_window_configuration ();
1030 extern Lisp_Object Fcoordinates_in_window_p ();
1031 extern Lisp_Object Fwindow_at ();
1032
1033 /* defined in screen.c */
1034 extern Lisp_Object Fscreenp ();
1035 extern Lisp_Object Fselect_screen ();
1036 extern Lisp_Object Ffocus_screen ();
1037 extern Lisp_Object Funfocus_screen ();
1038 extern Lisp_Object Fselected_screen ();
1039 extern Lisp_Object Fwindow_screen ();
1040 extern Lisp_Object Fscreen_root_window ();
1041 extern Lisp_Object Fscreen_selected_window ();
1042 extern Lisp_Object Fscreen_list ();
1043 extern Lisp_Object Fnext_screen ();
1044 extern Lisp_Object Fdelete_screen ();
1045 extern Lisp_Object Fread_mouse_position ();
1046 extern Lisp_Object Fset_mouse_position ();
1047 extern Lisp_Object Fmake_screen_visible ();
1048 extern Lisp_Object Fmake_screen_invisible ();
1049 extern Lisp_Object Ficonify_screen ();
1050 extern Lisp_Object Fdeiconify_screen ();
1051 extern Lisp_Object Fscreen_visible_p ();
1052 extern Lisp_Object Fvisible_screen_list ();
1053 extern Lisp_Object Fscreen_parameters ();
1054 extern Lisp_Object Fmodify_screen_parameters ();
1055 extern Lisp_Object Fscreen_pixel_size ();
1056 extern Lisp_Object Fscreen_height ();
1057 extern Lisp_Object Fscreen_width ();
1058 extern Lisp_Object Fset_screen_height ();
1059 extern Lisp_Object Fset_screen_width ();
1060 extern Lisp_Object Fset_screen_size ();
1061 extern Lisp_Object Fset_screen_position ();
1062 #ifndef HAVE_X11
1063 extern Lisp_Object Frubber_band_rectangle ();
1064 #endif  /* HAVE_X11 */
1065
1066 /* defined in emacs.c */
1067 extern Lisp_Object decode_env_path ();
1068 /* Nonzero means don't do interactive redisplay and don't change tty modes */
1069 extern int noninteractive;
1070 /* Nonzero means don't do use window-system-specific display code */
1071 extern int inhibit_window_system;
1072
1073 /* defined in process.c */
1074 extern Lisp_Object Fget_process (), Fget_buffer_process (), Fprocessp ();
1075 extern Lisp_Object Fprocess_status (), Fkill_process ();
1076
1077 /* defined in callproc.c */
1078 extern Lisp_Object Vexec_path, Vexec_directory, Vdata_directory;
1079
1080 /* defined in doc.c */
1081 extern Lisp_Object Vdoc_file_name;
1082 extern Lisp_Object Fsubstitute_command_keys ();
1083 extern Lisp_Object Fdocumentation (), Fdocumentation_property ();
1084
1085 /* defined in bytecode.c */
1086 extern Lisp_Object Qbytecode;
1087
1088 /* defined in macros.c */
1089 extern Lisp_Object Qexecute_kbd_macro;
1090 extern Lisp_Object Fexecute_kbd_macro ();
1091
1092 /* Nonzero means Emacs has already been initialized.
1093    Used during startup to detect startup of dumped Emacs.  */
1094 extern int initialized;
1095
1096 extern int immediate_quit;          /* Nonzero means ^G can quit instantly */
1097
1098 extern void debugger ();
1099
1100 extern char *malloc (), *realloc (), *getenv (), *ctime (), *getwd ();
1101 extern long *xmalloc (), *xrealloc ();
1102
1103 extern char *egetenv ();