src/lisp.h

   1 /* Fundamental definitions for GNU Emacs Lisp interpreter.
   2    Copyright (C) 1985, 1986, 1987, 1992 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 2, 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 #define NILP(x)  (XFASTINT (x) == XFASTINT (Qnil))
 510
 511 #ifdef LISP_FLOAT_TYPE
 512 #define NUMBERP(x) (XTYPE (x) == Lisp_Int || XTYPE (x) == Lisp_Float)
 513 #else
 514 #define NUMBERP(x) (XTYPE (x) == Lisp_Int)
 515 #endif
 516
 517 /* #define LISTP(x) (XTYPE ((x)) == Lisp_Cons)*/
 518 #define CONSP(x) (XTYPE ((x)) == Lisp_Cons)
 519 #define EQ(x, y) (XFASTINT (x) == XFASTINT (y))
 520
 521
 522 #define CHECK_LIST(x, i) \
 523   { if ((XTYPE ((x)) != Lisp_Cons) && !NILP (x)) x = wrong_type_argument (Qlistp, (x)); }
 524
 525 #define CHECK_STRING(x, i) \
 526   { if (XTYPE ((x)) != Lisp_String) x = wrong_type_argument (Qstringp, (x)); }
 527
 528 #define CHECK_CONS(x, i) \
 529   { if (XTYPE ((x)) != Lisp_Cons) x = wrong_type_argument (Qconsp, (x)); }
 530
 531 #define CHECK_SYMBOL(x, i) \
 532   { if (XTYPE ((x)) != Lisp_Symbol) x = wrong_type_argument (Qsymbolp, (x)); }
 533
 534 #define CHECK_VECTOR(x, i) \
 535   { if (XTYPE ((x)) != Lisp_Vector) x = wrong_type_argument (Qvectorp, (x)); }
 536
 537 #define CHECK_BUFFER(x, i) \
 538   { if (XTYPE ((x)) != Lisp_Buffer) x = wrong_type_argument (Qbufferp, (x)); }
 539
 540 #define CHECK_WINDOW(x, i) \
 541   { if (XTYPE ((x)) != Lisp_Window) x = wrong_type_argument (Qwindowp, (x)); }
 542
 543 #define CHECK_PROCESS(x, i) \
 544   { if (XTYPE ((x)) != Lisp_Process) x = wrong_type_argument (Qprocessp, (x)); }
 545
 546 #define CHECK_NUMBER(x, i) \
 547   { if (XTYPE ((x)) != Lisp_Int) x = wrong_type_argument (Qintegerp, (x)); }
 548
 549 #define CHECK_NATNUM(x, i) \
 550   { if (XTYPE ((x)) != Lisp_Int || XINT ((x)) < 0)      \
 551       x = wrong_type_argument (Qnatnump, (x)); }
 552
 553 #define CHECK_MARKER(x, i) \
 554   { if (XTYPE ((x)) != Lisp_Marker) x = wrong_type_argument (Qmarkerp, (x)); }
 555
 556 #define CHECK_NUMBER_COERCE_MARKER(x, i) \
 557   { if (XTYPE ((x)) == Lisp_Marker) XFASTINT (x) = marker_position (x); \
 558     else if (XTYPE ((x)) != Lisp_Int) x = wrong_type_argument (Qinteger_or_marker_p, (x)); }
 559
 560 #ifdef LISP_FLOAT_TYPE
 561
 562 #ifndef DBL_DIG
 563 #define DBL_DIG 20
 564 #endif
 565
 566 #define XFLOATINT(n) extract_float((n))
 567
 568 #define CHECK_FLOAT(x, i)               \
 569 { if (XTYPE (x) != Lisp_Float)  \
 570     x = wrong_type_argument (Qfloatp, (x)); }
 571
 572 #define CHECK_NUMBER_OR_FLOAT(x, i)     \
 573 { if (XTYPE (x) != Lisp_Float && XTYPE (x) != Lisp_Int) \
 574     x = wrong_type_argument (Qinteger_or_floatp, (x)); }
 575
 576 #define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER(x, i) \
 577 { if (XTYPE (x) == Lisp_Marker) XFASTINT (x) = marker_position (x);     \
 578   else if (XTYPE (x) != Lisp_Int && XTYPE (x) != Lisp_Float)            \
 579     x = wrong_type_argument (Qinteger_or_float_or_marker_p, (x)); }
 580
 581 #else  /* Not LISP_FLOAT_TYPE */
 582
 583 #define CHECK_NUMBER_OR_FLOAT CHECK_NUMBER
 584
 585 #define CHECK_NUMBER_OR_FLOAT_COERCE_MARKER CHECK_NUMBER_COERCE_MARKER
 586
 587 #define XFLOATINT(n) XINT((n))
 588 #endif /* LISP_FLOAT_TYPE */
 589
 590 /* Cast pointers to this type to compare them.  Some machines want int.  */
 591 #ifndef PNTR_COMPARISON_TYPE
 592 #define PNTR_COMPARISON_TYPE unsigned int
 593 #endif
 594 \f
 595 /* Define a built-in function for calling from Lisp.
 596  `lname' should be the name to give the function in Lisp,
 597     as a null-terminated C string.
 598  `fnname' should be the name of the function in C.
 599     By convention, it starts with F.
 600  `sname' should be the name for the C constant structure
 601     that records information on this function for internal use.
 602     By convention, it should be the same as `fnname' but with S instead of F.
 603     It's too bad that C macros can't compute this from `fnname'.
 604  `minargs' should be a number, the minimum number of arguments allowed.
 605  `maxargs' should be a number, the maximum number of arguments allowed,
 606     or else MANY or UNEVALLED.
 607     MANY means pass a vector of evaluated arguments,
 608          in the form of an integer number-of-arguments
 609          followed by the address of a vector of Lisp_Objects
 610          which contains the argument values.
 611     UNEVALLED means pass the list of unevaluated arguments
 612  `prompt' says how to read arguments for an interactive call.
 613     This can be zero or a C string.
 614     Zero means that interactive calls are not allowed.
 615     A string is interpreted in a hairy way:
 616      it should contain one line for each argument to be read, terminated by \n.
 617      The first character of the line controls the type of parsing:
 618        s  --  read a string.
 619        S  --  read a symbol.
 620        k  --  read a key sequence and return it as a string.
 621        a  --  read a function name (symbol) with completion.
 622        C  --  read a command name (symbol) with completion.
 623        v  --  read a variable name (symbol) with completion.
 624        b  --  read a buffer name (a string) with completion.
 625        B  --  buffer name, may be existing buffer or may not be.
 626        f  --  read a file name, file must exist.
 627        F  --  read a file name, file need not exist.
 628        n  --  read a number.
 629        c  --  read a character and return it as a number.
 630        p  --  use the numeric value of the prefix argument.
 631        P  --  use raw value of prefix - can be nil, -, (NUMBER) or NUMBER.
 632        x  --  read a Lisp object from the minibuffer.
 633        X  --  read a Lisp form from the minibuffer and use its value.
 634     A null string means call interactively with no arguments.
 635  `doc' is documentation for the user.
 636 */
 637
 638 #define DEFUN(lname, fnname, sname, minargs, maxargs, prompt, doc) \
 639   Lisp_Object fnname (); \
 640   struct Lisp_Subr sname = {fnname, minargs, maxargs, lname, prompt, 0}; \
 641   Lisp_Object fnname
 642
 643 /* defsubr (Sname);
 644  is how we define the symbol for function `name' at start-up time. */
 645 extern void defsubr ();
 646
 647 #define MANY -2
 648 #define UNEVALLED -1
 649
 650 extern void defvar_lisp ();
 651 extern void defvar_bool ();
 652 extern void defvar_int ();
 653
 654 /* Macros we use to define forwarded Lisp variables.
 655    These are used in the syms_of_FILENAME functions.  */
 656
 657 #define DEFVARLISP(lname, vname, doc) defvar_lisp (lname, vname)
 658 #define DEFVARBOOL(lname, vname, doc) defvar_bool (lname, vname)
 659 #define DEFVARINT(lname, vname, doc) defvar_int (lname, vname)
 660 #define DEFVARPERBUFFER(lname, vname, doc)  \
 661  defvar_per_buffer (lname, vname)
 662
 663 #define DEFVAR_LISP(lname, vname, doc) defvar_lisp (lname, vname)
 664 #define DEFVAR_LISP_NOPRO(lname, vname, doc) defvar_lisp_nopro (lname, vname)
 665 #define DEFVAR_BOOL(lname, vname, doc) defvar_bool (lname, vname)
 666 #define DEFVAR_INT(lname, vname, doc) defvar_int (lname, vname)
 667 #define DEFVAR_PER_BUFFER(lname, vname, doc)  \
 668  defvar_per_buffer (lname, vname)
 669 \f
 670 /* Structure for recording Lisp call stack for backtrace purposes */
 671
 672 struct specbinding
 673   {
 674     Lisp_Object symbol, old_value;
 675     Lisp_Object (*func) ();
 676     Lisp_Object unused;         /* Dividing by 16 is faster than by 12 */
 677   };
 678
 679 extern struct specbinding *specpdl;
 680 extern struct specbinding *specpdl_ptr;
 681 extern int specpdl_size;
 682
 683 struct handler
 684   {
 685     Lisp_Object handler;
 686     Lisp_Object var;
 687     int poll_suppress_count;    /* No error should exit a piece of code
 688                                    in which polling is suppressed.  */
 689     struct catchtag *tag;
 690     struct handler *next;
 691   };
 692
 693 extern struct handler *handlerlist;
 694
 695 extern struct catchtag *catchlist;
 696 extern struct backtrace *backtrace_list;
 697
 698 /* An address near the bottom of the stack.
 699    Tells GC how to save a copy of the stack.  */
 700 extern char *stack_bottom;
 701
 702 /* Check quit-flag and quit if it is non-nil. */
 703
 704 #define QUIT \
 705   if (!NILP (Vquit_flag) && NILP (Vinhibit_quit)) \
 706     { Vquit_flag = Qnil; Fsignal (Qquit, Qnil); }
 707
 708 /* Nonzero if ought to quit now.  */
 709
 710 #define QUITP (!NILP (Vquit_flag) && NILP (Vinhibit_quit))
 711 \f
 712 /* 1 if CH is upper case.  */
 713
 714 #define UPPERCASEP(CH) \
 715   (XSTRING (current_buffer->downcase_table)->data[CH] != (CH))
 716
 717 /* 1 if CH is lower case.  */
 718
 719 #define LOWERCASEP(CH) \
 720   (!UPPERCASEP (CH) \
 721    && XSTRING (current_buffer->upcase_table)->data[CH] != (CH))
 722
 723 /* 1 if CH is neither upper nor lower case.  */
 724
 725 #define NOCASEP(CH) (XSTRING (current_buffer->upcase_table)->data[CH] == (CH))
 726
 727 /* Upcase a character, or make no change if that cannot be done.  */
 728
 729 #define UPCASE(CH) \
 730   (XSTRING (current_buffer->downcase_table)->data[CH] == (CH) \
 731    ? UPCASE1 (CH) : (CH))
 732
 733 /* Upcase a character known to be not upper case.  */
 734
 735 #define UPCASE1(CH) (XSTRING (current_buffer->upcase_table)->data[CH])
 736
 737 /* Downcase a character, or make no change if that cannot be done. */
 738
 739 #define DOWNCASE(CH) (XSTRING (current_buffer->downcase_table)->data[CH])
 740
 741 /* Current buffer's map from characters to lower-case characters.  */
 742
 743 #define DOWNCASE_TABLE XSTRING (current_buffer->downcase_table)->data
 744
 745 /* Table mapping each char to the next char with the same lowercase version.
 746    This mapping is a no-op only for characters that don't have case.  */
 747 #define UPCASE_TABLE XSTRING (current_buffer->upcase_table)->data
 748
 749 extern Lisp_Object Vascii_downcase_table, Vascii_upcase_table;
 750 \f
 751 /* number of bytes of structure consed since last GC */
 752
 753 extern int consing_since_gc;
 754
 755 /* threshold for doing another gc */
 756
 757 extern int gc_cons_threshold;
 758
 759 /* Structure for recording stack slots that need marking */
 760
 761 /* This is a chain of structures, each of which points at a Lisp_Object variable
 762  whose value should be marked in garbage collection.
 763  Normally every link of the chain is an automatic variable of a function,
 764  and its `val' points to some argument or local variable of the function.
 765  On exit to the function, the chain is set back to the value it had on entry.
 766  This way, no link remains in the chain when the stack frame containing the link disappears.
 767
 768  Every function that can call Feval must protect in this fashion all
 769  Lisp_Object variables whose contents will be used again. */
 770
 771 extern struct gcpro *gcprolist;
 772
 773 struct gcpro
 774   {
 775     struct gcpro *next;
 776     Lisp_Object *var;           /* Address of first protected variable */
 777     int nvars;                  /* Number of consecutive protected variables */
 778   };
 779
 780 #define GCPRO1(varname) \
 781  {gcpro1.next = gcprolist; gcpro1.var = &varname; gcpro1.nvars = 1; \
 782   gcprolist = &gcpro1; }
 783
 784 #define GCPRO2(varname1, varname2) \
 785  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 786   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 787   gcprolist = &gcpro2; }
 788
 789 #define GCPRO3(varname1, varname2, varname3) \
 790  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 791   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 792   gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
 793   gcprolist = &gcpro3; }
 794
 795 #define GCPRO4(varname1, varname2, varname3, varname4) \
 796  {gcpro1.next = gcprolist; gcpro1.var = &varname1; gcpro1.nvars = 1; \
 797   gcpro2.next = &gcpro1; gcpro2.var = &varname2; gcpro2.nvars = 1; \
 798   gcpro3.next = &gcpro2; gcpro3.var = &varname3; gcpro3.nvars = 1; \
 799   gcpro4.next = &gcpro3; gcpro4.var = &varname4; gcpro4.nvars = 1; \
 800   gcprolist = &gcpro4; }
 801
 802 /* Call staticpro (&var) to protect static variable `var'. */
 803
 804 void staticpro();
 805
 806 #define UNGCPRO (gcprolist = gcpro1.next)
 807
 808 /* Evaluate expr, UNGCPRO, and then return the value of expr.  */
 809 #define RETURN_UNGCPRO(expr)            \
 810   do                                    \
 811     {                                   \
 812       Lisp_Object ret_ungc_val;         \
 813       ret_ungc_val = (expr);            \
 814       UNGCPRO;                          \
 815       return ret_ungc_val;              \
 816     }                                   \
 817   while (0)
 818 \f
 819 /* Defined in data.c */
 820 extern Lisp_Object Qnil, Qt, Qquote, Qlambda, Qsubr, Qunbound;
 821 extern Lisp_Object Qerror_conditions, Qerror_message, Qtop_level;
 822 extern Lisp_Object Qerror, Qquit, Qwrong_type_argument, Qargs_out_of_range;
 823 extern Lisp_Object Qvoid_variable, Qvoid_function;
 824 extern Lisp_Object Qsetting_constant, Qinvalid_read_syntax;
 825 extern Lisp_Object Qinvalid_function, Qwrong_number_of_arguments, Qno_catch;
 826 extern Lisp_Object Qend_of_file, Qarith_error;
 827 extern Lisp_Object Qbeginning_of_buffer, Qend_of_buffer, Qbuffer_read_only;
 828
 829 extern Lisp_Object Qintegerp, Qnatnump, Qsymbolp, Qlistp, Qconsp;
 830 extern Lisp_Object Qstringp, Qarrayp, Qsequencep, Qbufferp;
 831 extern Lisp_Object Qchar_or_string_p, Qmarkerp, Qvectorp;
 832 extern Lisp_Object Qinteger_or_marker_p, Qboundp, Qfboundp;
 833 extern Lisp_Object Qcdr;
 834
 835 #ifdef LISP_FLOAT_TYPE
 836 extern Lisp_Object Qfloatp, Qinteger_or_floatp, Qinteger_or_float_or_marker_p;
 837 #endif /* LISP_FLOAT_TYPE */
 838
 839 extern Lisp_Object Qscreenp;
 840
 841 extern Lisp_Object Feq (), Fnull (), Flistp (), Fconsp (), Fatom (), Fnlistp ();
 842 extern Lisp_Object Fintegerp (), Fnatnump (), Fsymbolp ();
 843 extern Lisp_Object Fvectorp (), Fstringp (), Farrayp (), Fsequencep ();
 844 extern Lisp_Object Fbufferp (), Fmarkerp (), Fsubrp (), Fchar_or_string_p ();
 845 extern Lisp_Object Finteger_or_marker_p ();
 846 #ifdef LISP_FLOAT_TYPE
 847 extern Lisp_Object Ffloatp(), Finteger_or_floatp();
 848 extern Lisp_Object Finteger_or_float_or_marker_p(), Ftruncate();
 849 #endif /* LISP_FLOAT_TYPE */
 850
 851 extern Lisp_Object Fcar (), Fcar_safe(), Fcdr (), Fcdr_safe();
 852 extern Lisp_Object Fsetcar (), Fsetcdr ();
 853 extern Lisp_Object Fboundp (), Ffboundp (), Fmakunbound (), Ffmakunbound ();
 854 extern Lisp_Object Fsymbol_function (), Fsymbol_plist (), Fsymbol_name ();
 855 extern Lisp_Object indirect_function (), Findirect_function ();
 856 extern Lisp_Object Ffset (), Fsetplist ();
 857 extern Lisp_Object Fsymbol_value (), find_symbol_value (), Fset ();
 858 extern Lisp_Object Fdefault_value (), Fset_default ();
 859
 860 extern Lisp_Object Faref (), Faset (), Farray_length ();
 861
 862 extern Lisp_Object Fstring_to_int (), Fint_to_string ();
 863 extern Lisp_Object Feqlsign (), Fgtr (), Flss (), Fgeq (), Fleq (), Fneq (), Fzerop ();
 864 extern Lisp_Object Fplus (), Fminus (), Ftimes (), Fquo (), Frem (), Fmax (), Fmin ();
 865 extern Lisp_Object Flogand (), Flogior (), Flogxor (), Flognot (), Flsh (), Fash ();
 866 extern Lisp_Object Fadd1 (), Fsub1 ();
 867
 868 extern Lisp_Object make_number ();
 869 extern void args_out_of_range ();
 870 extern void args_out_of_range_3 ();
 871 extern Lisp_Object wrong_type_argument ();
 872 #ifdef LISP_FLOAT_TYPE
 873 extern Lisp_Object Ffloat_to_int(), Fint_to_float();
 874 extern double extract_float();
 875 #endif /* LISP_FLOAT_TYPE */
 876
 877 /* Defined in fns.c */
 878 extern Lisp_Object Qstring_lessp;
 879 extern Lisp_Object Vfeatures;
 880 extern Lisp_Object Fidentity (), Frandom ();
 881 extern Lisp_Object Flength ();
 882 extern Lisp_Object Fappend (), Fconcat (), Fvconcat (), Fcopy_sequence ();
 883 extern Lisp_Object Fsubstring ();
 884 extern Lisp_Object Fnthcdr (), Fmemq (), Fassq (), Fassoc ();
 885 extern Lisp_Object Frassq (), Fdelq (), Fsort ();
 886 extern Lisp_Object Freverse (), Fnreverse (), Fget (), Fput (), Fequal ();
 887 extern Lisp_Object Ffillarray (), Fnconc (), Fmapcar (), Fmapconcat ();
 888 extern Lisp_Object Fy_or_n_p (), do_yes_or_no_p ();
 889 extern Lisp_Object Ffeaturep (), Frequire () , Fprovide ();
 890 extern Lisp_Object concat2 (), nconc2 ();
 891 extern Lisp_Object assq_no_quit ();
 892
 893 /* Defined in alloc.c */
 894 extern Lisp_Object Vpurify_flag;
 895 extern Lisp_Object Fcons (), Flist(), Fmake_list ();
 896 extern Lisp_Object Fmake_vector (), Fvector (), Fmake_symbol (), Fmake_marker ();
 897 extern Lisp_Object Fmake_string (), build_string (), make_string ();
 898 extern Lisp_Object make_array (), make_uninit_string ();
 899 extern Lisp_Object Fpurecopy (), make_pure_string ();
 900 extern Lisp_Object pure_cons (), make_pure_vector ();
 901 extern Lisp_Object Fgarbage_collect ();
 902
 903 /* Defined in print.c */
 904 extern Lisp_Object Vprin1_to_string_buffer;
 905 extern Lisp_Object Fprin1 (), Fprin1_to_string (), Fprinc ();
 906 extern Lisp_Object Fterpri (), Fprint ();
 907 extern Lisp_Object Vstandard_output, Qstandard_output;
 908 extern Lisp_Object Qexternal_debugging_output;
 909 extern void temp_output_buffer_setup (), temp_output_buffer_show ();
 910 extern int print_level, print_escape_newlines;
 911 extern Lisp_Object Qprint_escape_newlines;
 912
 913 /* Defined in lread.c */
 914 extern Lisp_Object Qvariable_documentation, Qstandard_input;
 915 extern Lisp_Object Vobarray, Vstandard_input;
 916 extern Lisp_Object Fread (), Fread_from_string ();
 917 extern Lisp_Object Fintern (), Fintern_soft (), Fload ();
 918 extern Lisp_Object Fget_file_char (), Fread_char ();
 919 extern Lisp_Object Feval_current_buffer (), Feval_region ();
 920 extern Lisp_Object intern (), oblookup ();
 921
 922 /* Defined in eval.c */
 923 extern Lisp_Object Qautoload, Qexit, Qinteractive, Qcommandp, Qdefun, Qmacro;
 924 extern Lisp_Object Vinhibit_quit, Qinhibit_quit, Vquit_flag;
 925 extern Lisp_Object Vmocklisp_arguments, Qmocklisp, Qmocklisp_arguments;
 926 extern Lisp_Object Vautoload_queue;
 927 extern Lisp_Object Vrun_hooks;
 928 extern Lisp_Object Fand (), For (), Fif (), Fprogn (), Fprog1 (), Fprog2 ();
 929 extern Lisp_Object Fsetq (), Fquote ();
 930 extern Lisp_Object Fuser_variable_p (), Finteractive_p ();
 931 extern Lisp_Object Fdefun (), Flet (), FletX (), Fwhile ();
 932 extern Lisp_Object Fcatch (), Fthrow (), Funwind_protect ();
 933 extern Lisp_Object Fcondition_case (), Fsignal ();
 934 extern Lisp_Object Ffunction_type (), Fautoload (), Fcommandp ();
 935 extern Lisp_Object Feval (), Fapply (), Ffuncall ();
 936 extern Lisp_Object Fglobal_set (), Fglobal_value (), Fbacktrace ();
 937 extern Lisp_Object apply1 (), call0 (), call1 (), call2 (), call3 ();
 938 extern Lisp_Object apply_lambda ();
 939 extern Lisp_Object internal_catch ();
 940 extern Lisp_Object internal_condition_case ();
 941 extern Lisp_Object unbind_to ();
 942 extern void error ();
 943 extern Lisp_Object un_autoload ();
 944
 945 /* Defined in editfns.c */
 946 extern Lisp_Object Vprefix_arg, Qminus, Vcurrent_prefix_arg;
 947 extern Lisp_Object Fgoto_char ();
 948 extern Lisp_Object Fpoint_min_marker (), Fpoint_max_marker ();
 949 extern Lisp_Object Fpoint_min (), Fpoint_max ();
 950 extern Lisp_Object Fpoint (), Fpoint_marker (), Fmark_marker ();
 951 extern Lisp_Object Ffollowing_char (), Fprevious_char (), Fchar_after ();
 952 extern Lisp_Object Finsert ();
 953 extern Lisp_Object Feolp (), Feobp (), Fbolp (), Fbobp ();
 954 extern Lisp_Object Fformat (), format1 ();
 955 extern Lisp_Object make_buffer_string (), Fbuffer_substring ();
 956 extern Lisp_Object Fbuffer_string ();
 957 extern Lisp_Object Fstring_equal (), Fstring_lessp (), Fbuffer_substring_lessp ();
 958 extern Lisp_Object save_excursion_save (), save_restriction_save ();
 959 extern Lisp_Object save_excursion_restore (), save_restriction_restore ();
 960 extern Lisp_Object Fchar_to_string ();
 961
 962 /* defined in buffer.c */
 963 extern Lisp_Object Vbuffer_alist;
 964 extern Lisp_Object Fget_buffer (), Fget_buffer_create (), Fset_buffer ();
 965 extern Lisp_Object Fbarf_if_buffer_read_only ();
 966 extern Lisp_Object Fcurrent_buffer (), Fswitch_to_buffer (), Fpop_to_buffer ();
 967 extern Lisp_Object Fother_buffer ();
 968 extern struct buffer *all_buffers;
 969
 970 /* defined in marker.c */
 971
 972 extern Lisp_Object Fmarker_position (), Fmarker_buffer ();
 973 extern Lisp_Object Fcopy_marker ();
 974
 975 /* Defined in fileio.c */
 976
 977 extern Lisp_Object Qfile_error;
 978 extern Lisp_Object Ffile_name_as_directory ();
 979 extern Lisp_Object Fexpand_file_name (), Ffile_name_nondirectory ();
 980 extern Lisp_Object Fsubstitute_in_file_name ();
 981 extern Lisp_Object Ffile_symlink_p ();
 982
 983 /* Defined in abbrev.c */
 984
 985 extern Lisp_Object Vfundamental_mode_abbrev_table;
 986
 987 /* defined in search.c */
 988 extern Lisp_Object Fstring_match ();
 989 extern Lisp_Object Fscan_buffer ();
 990
 991 /* defined in minibuf.c */
 992
 993 extern Lisp_Object last_minibuf_string;
 994 extern Lisp_Object read_minibuf (), Fcompleting_read ();
 995 extern Lisp_Object Fread_from_minibuffer ();
 996 extern Lisp_Object Fread_variable (), Fread_buffer (), Fread_key_sequence ();
 997 extern Lisp_Object Fread_minibuffer (), Feval_minibuffer ();
 998 extern Lisp_Object Fread_string (), Fread_file_name ();
 999 extern Lisp_Object Fread_no_blanks_input ();
1000
1001 /* Defined in callint.c */
1002
1003 extern Lisp_Object Vcommand_history;
1004 extern Lisp_Object Qcall_interactively;
1005 extern Lisp_Object Fcall_interactively ();
1006 extern Lisp_Object Fprefix_numeric_value ();
1007
1008 /* defined in casefiddle.c */
1009
1010 extern Lisp_Object Fdowncase (), Fupcase (), Fcapitalize ();
1011
1012 /* defined in keyboard.c */
1013
1014 extern Lisp_Object Qdisabled;
1015 extern Lisp_Object Vhelp_form, Vtop_level;
1016 extern Lisp_Object Fdiscard_input (), Frecursive_edit ();
1017 extern Lisp_Object Fcommand_execute (), Finput_pending_p ();
1018
1019 /* defined in keymap.c */
1020
1021 extern Lisp_Object Qkeymap;
1022 extern Lisp_Object current_global_map;
1023 extern Lisp_Object Fkey_description (), Fsingle_key_description ();
1024 extern Lisp_Object Fwhere_is_internal ();
1025 extern Lisp_Object access_keymap (), store_in_keymap ();
1026 extern Lisp_Object get_keyelt (), get_keymap();
1027
1028 /* defined in indent.c */
1029 extern Lisp_Object Fvertical_motion (), Findent_to (), Fcurrent_column ();
1030
1031 /* defined in window.c */
1032 extern Lisp_Object Qwindowp;
1033 extern Lisp_Object Fget_buffer_window ();
1034 extern Lisp_Object Fsave_window_excursion ();
1035 extern Lisp_Object Fset_window_configuration (), Fcurrent_window_configuration ();
1036 extern Lisp_Object Fcoordinates_in_window_p ();
1037 extern Lisp_Object Fwindow_at ();
1038
1039 /* defined in screen.c */
1040 extern Lisp_Object Fscreenp ();
1041 extern Lisp_Object Fselect_screen ();
1042 extern Lisp_Object Ffocus_screen ();
1043 extern Lisp_Object Funfocus_screen ();
1044 extern Lisp_Object Fselected_screen ();
1045 extern Lisp_Object Fwindow_screen ();
1046 extern Lisp_Object Fscreen_root_window ();
1047 extern Lisp_Object Fscreen_selected_window ();
1048 extern Lisp_Object Fscreen_list ();
1049 extern Lisp_Object Fnext_screen ();
1050 extern Lisp_Object Fdelete_screen ();
1051 extern Lisp_Object Fread_mouse_position ();
1052 extern Lisp_Object Fset_mouse_position ();
1053 extern Lisp_Object Fmake_screen_visible ();
1054 extern Lisp_Object Fmake_screen_invisible ();
1055 extern Lisp_Object Ficonify_screen ();
1056 extern Lisp_Object Fdeiconify_screen ();
1057 extern Lisp_Object Fscreen_visible_p ();
1058 extern Lisp_Object Fvisible_screen_list ();
1059 extern Lisp_Object Fscreen_parameters ();
1060 extern Lisp_Object Fmodify_screen_parameters ();
1061 extern Lisp_Object Fscreen_pixel_size ();
1062 extern Lisp_Object Fscreen_height ();
1063 extern Lisp_Object Fscreen_width ();
1064 extern Lisp_Object Fset_screen_height ();
1065 extern Lisp_Object Fset_screen_width ();
1066 extern Lisp_Object Fset_screen_size ();
1067 extern Lisp_Object Fset_screen_position ();
1068 #ifndef HAVE_X11
1069 extern Lisp_Object Frubber_band_rectangle ();
1070 #endif  /* HAVE_X11 */
1071
1072 /* defined in emacs.c */
1073 extern Lisp_Object decode_env_path ();
1074 /* Nonzero means don't do interactive redisplay and don't change tty modes */
1075 extern int noninteractive;
1076 /* Nonzero means don't do use window-system-specific display code */
1077 extern int inhibit_window_system;
1078
1079 /* defined in process.c */
1080 extern Lisp_Object Fget_process (), Fget_buffer_process (), Fprocessp ();
1081 extern Lisp_Object Fprocess_status (), Fkill_process ();
1082
1083 /* defined in callproc.c */
1084 extern Lisp_Object Vexec_path, Vexec_directory, Vdata_directory;
1085
1086 /* defined in doc.c */
1087 extern Lisp_Object Vdoc_file_name;
1088 extern Lisp_Object Fsubstitute_command_keys ();
1089 extern Lisp_Object Fdocumentation (), Fdocumentation_property ();
1090
1091 /* defined in bytecode.c */
1092 extern Lisp_Object Qbytecode;
1093
1094 /* defined in macros.c */
1095 extern Lisp_Object Qexecute_kbd_macro;
1096 extern Lisp_Object Fexecute_kbd_macro ();
1097
1098 /* Nonzero means Emacs has already been initialized.
1099    Used during startup to detect startup of dumped Emacs.  */
1100 extern int initialized;
1101
1102 extern int immediate_quit;          /* Nonzero means ^G can quit instantly */
1103
1104 extern void debugger ();
1105
1106 extern char *malloc (), *realloc (), *getenv (), *ctime (), *getwd ();
1107 extern long *xmalloc (), *xrealloc ();
1108
1109 extern char *egetenv ();