lread.c 78.7 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Lisp parsing and input streams.
Richard M. Stallman's avatar
Richard M. Stallman committed
2
   Copyright (C) 1985, 86, 87, 88, 89, 93, 94, 95, 97, 1998
3
      Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
Jim Blandy's avatar
Jim Blandy committed
9
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
21 22


Richard M. Stallman's avatar
Richard M. Stallman committed
23
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
24 25 26 27
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
28
#include <errno.h>
Jim Blandy's avatar
Jim Blandy committed
29 30 31 32
#include "lisp.h"

#ifndef standalone
#include "buffer.h"
Karl Heuer's avatar
Karl Heuer committed
33
#include "charset.h"
34
#include <paths.h>
Jim Blandy's avatar
Jim Blandy committed
35
#include "commands.h"
Jim Blandy's avatar
Jim Blandy committed
36
#include "keyboard.h"
37
#include "termhooks.h"
Jim Blandy's avatar
Jim Blandy committed
38 39 40 41 42 43
#endif

#ifdef lint
#include <sys/inode.h>
#endif /* lint */

44 45 46 47 48 49 50
#ifdef MSDOS
#if __DJGPP__ < 2
#include <unistd.h>	/* to get X_OK */
#endif
#include "msdos.h"
#endif

Jim Blandy's avatar
Jim Blandy committed
51 52 53 54 55
#ifndef X_OK
#define X_OK 01
#endif

#ifdef LISP_FLOAT_TYPE
56 57 58
#ifdef STDC_HEADERS
#include <stdlib.h>
#endif
59

Jim Blandy's avatar
Jim Blandy committed
60 61 62
#include <math.h>
#endif /* LISP_FLOAT_TYPE */

Richard M. Stallman's avatar
Richard M. Stallman committed
63 64 65 66
#ifdef HAVE_SETLOCALE
#include <locale.h>
#endif /* HAVE_SETLOCALE */

Richard M. Stallman's avatar
Richard M. Stallman committed
67 68 69 70
#ifndef O_RDONLY
#define O_RDONLY 0
#endif

71 72
extern int errno;

73
Lisp_Object Qread_char, Qget_file_char, Qstandard_input, Qcurrent_load_list;
Jim Blandy's avatar
Jim Blandy committed
74
Lisp_Object Qvariable_documentation, Vvalues, Vstandard_input, Vafter_load_alist;
75
Lisp_Object Qascii_character, Qload, Qload_file_name;
76
Lisp_Object Qbackquote, Qcomma, Qcomma_at, Qcomma_dot, Qfunction;
77
Lisp_Object Qinhibit_file_name_operation;
78 79

extern Lisp_Object Qevent_symbol_element_mask;
80
extern Lisp_Object Qfile_exists_p;
Jim Blandy's avatar
Jim Blandy committed
81 82 83 84

/* non-zero if inside `load' */
int load_in_progress;

85 86 87
/* Directory in which the sources were found.  */
Lisp_Object Vsource_directory;

Jim Blandy's avatar
Jim Blandy committed
88 89 90
/* Search path for files to be loaded. */
Lisp_Object Vload_path;

91 92 93 94
/* This is the user-visible association list that maps features to
   lists of defs in their load files. */
Lisp_Object Vload_history;

95
/* This is used to build the load history. */
96 97
Lisp_Object Vcurrent_load_list;

98 99 100
/* List of files that were preloaded.  */
Lisp_Object Vpreloaded_file_list;

101 102 103
/* Name of file actually being read by `load'.  */
Lisp_Object Vload_file_name;

104 105 106
/* Function to use for reading, in `load' and friends.  */
Lisp_Object Vload_read_function;

107 108 109 110 111 112
/* The association list of objects read with the #n=object form.
   Each member of the list has the form (n . object), and is used to
   look up the object for the corresponding #n# construct.
   It must be set to nil before all top-level calls to read0.  */
Lisp_Object read_objects;

113 114 115
/* Nonzero means load should forcibly load all dynamic doc strings.  */
static int load_force_doc_strings;

116 117 118
/* Nonzero means read should convert strings to unibyte.  */
static int load_convert_to_unibyte;

Karl Heuer's avatar
Karl Heuer committed
119 120 121 122
/* Function to use for loading an Emacs lisp source file (not
   compiled) instead of readevalloop.  */
Lisp_Object Vload_source_file_function;

123 124 125
/* List of descriptors now open for Fload.  */
static Lisp_Object load_descriptor_list;

126
/* File for get_file_char to read from.  Use by load.  */
Jim Blandy's avatar
Jim Blandy committed
127 128 129 130 131
static FILE *instream;

/* When nonzero, read conses in pure space */
static int read_pure;

132
/* For use within read-from-string (this reader is non-reentrant!!)  */
Jim Blandy's avatar
Jim Blandy committed
133
static int read_from_string_index;
134
static int read_from_string_index_byte;
Jim Blandy's avatar
Jim Blandy committed
135
static int read_from_string_limit;
136

137 138 139 140
/* Number of bytes left to read in the buffer character
   that `readchar' has already advanced over.  */
static int readchar_backlog;

141 142
/* This contains the last string skipped with #@, but only on some systems.
     On other systems we can't put the string here.  */
143 144 145 146 147 148 149 150
static char *saved_doc_string;
/* Length of buffer allocated in saved_doc_string.  */
static int saved_doc_string_size;
/* Length of actual data in saved_doc_string.  */
static int saved_doc_string_length;
/* This is the file position that string came from.  */
static int saved_doc_string_position;

151 152 153 154 155
/* Nonzero means inside a new-style backquote
   with no surrounding parentheses.
   Fread initializes this to zero, so we need not specbind it
   or worry about what happens to it when there is an error.  */
static int new_backquote_flag;
Jim Blandy's avatar
Jim Blandy committed
156 157 158

/* Handle unreading and rereading of characters.
   Write READCHAR to read a character,
Karl Heuer's avatar
Karl Heuer committed
159 160 161 162 163
   UNREAD(c) to unread c to be read again.

   These macros actually read/unread a byte code, multibyte characters
   are not handled here.  The caller should manage them if necessary.
 */
Jim Blandy's avatar
Jim Blandy committed
164 165 166 167 168 169 170 171 172 173 174

#define READCHAR readchar (readcharfun)
#define UNREAD(c) unreadchar (readcharfun, c)

static int
readchar (readcharfun)
     Lisp_Object readcharfun;
{
  Lisp_Object tem;
  register int c, mpos;

175
  if (BUFFERP (readcharfun))
Jim Blandy's avatar
Jim Blandy committed
176
    {
177
      register struct buffer *inbuffer = XBUFFER (readcharfun);
Jim Blandy's avatar
Jim Blandy committed
178

179 180
      int pt_byte = BUF_PT_BYTE (inbuffer);
      int orig_pt_byte = pt_byte;
181

182 183
      if (pt_byte >= BUF_ZV_BYTE (inbuffer))
	return -1;
Jim Blandy's avatar
Jim Blandy committed
184

185 186 187 188 189 190 191 192 193 194
      if (! NILP (inbuffer->enable_multibyte_characters))
	{
	  unsigned char *p = BUF_BYTE_ADDRESS (inbuffer, pt_byte);
	  BUF_INC_POS (inbuffer, pt_byte);
	  c = STRING_CHAR (p, pt_byte - orig_pt_byte);
	}
      else
	{
	  c = BUF_FETCH_BYTE (inbuffer, pt_byte);
	  pt_byte++;
195
	}
196
      SET_BUF_PT_BOTH (inbuffer, BUF_PT (inbuffer) + 1, pt_byte);
197

198
      return c;
Jim Blandy's avatar
Jim Blandy committed
199
    }
200
  if (MARKERP (readcharfun))
Jim Blandy's avatar
Jim Blandy committed
201
    {
202
      register struct buffer *inbuffer = XMARKER (readcharfun)->buffer;
Jim Blandy's avatar
Jim Blandy committed
203

204 205
      int bytepos = marker_byte_position (readcharfun);
      int orig_bytepos = bytepos;
206

207 208
      if (bytepos >= BUF_ZV_BYTE (inbuffer))
	return -1;
209

210 211 212 213 214 215 216 217 218 219
      if (! NILP (inbuffer->enable_multibyte_characters))
	{
	  unsigned char *p = BUF_BYTE_ADDRESS (inbuffer, bytepos);
	  BUF_INC_POS (inbuffer, bytepos);
	  c = STRING_CHAR (p, bytepos - orig_bytepos);
	}
      else
	{
	  c = BUF_FETCH_BYTE (inbuffer, bytepos);
	  bytepos++;
220 221
	}

222 223 224 225
      XMARKER (readcharfun)->bytepos = bytepos;
      XMARKER (readcharfun)->charpos++;

      return c;
Jim Blandy's avatar
Jim Blandy committed
226 227
    }
  if (EQ (readcharfun, Qget_file_char))
228 229 230 231 232 233 234 235 236 237 238 239
    {
      c = getc (instream);
#ifdef EINTR
      /* Interrupted reads have been observed while reading over the network */
      while (c == EOF && ferror (instream) && errno == EINTR)
	{
	  clearerr (instream);
	  c = getc (instream);
	}
#endif
      return c;
    }
Jim Blandy's avatar
Jim Blandy committed
240

241
  if (STRINGP (readcharfun))
Jim Blandy's avatar
Jim Blandy committed
242
    {
243
      if (read_from_string_index >= read_from_string_limit)
Jim Blandy's avatar
Jim Blandy committed
244
	c = -1;
245 246 247 248 249 250
      else if (STRING_MULTIBYTE (readcharfun))
	FETCH_STRING_CHAR_ADVANCE (c, readcharfun,
				   read_from_string_index,
				   read_from_string_index_byte);
      else
	c = XSTRING (readcharfun)->data[read_from_string_index++];
251

Jim Blandy's avatar
Jim Blandy committed
252 253 254 255 256
      return c;
    }

  tem = call0 (readcharfun);

Jim Blandy's avatar
Jim Blandy committed
257
  if (NILP (tem))
Jim Blandy's avatar
Jim Blandy committed
258 259 260 261 262 263 264 265 266 267 268 269
    return -1;
  return XINT (tem);
}

/* Unread the character C in the way appropriate for the stream READCHARFUN.
   If the stream is a user function, call it with the char as argument.  */

static void
unreadchar (readcharfun, c)
     Lisp_Object readcharfun;
     int c;
{
270 271 272 273
  if (c == -1)
    /* Don't back up the pointer if we're unreading the end-of-input mark,
       since readchar didn't advance it when we read it.  */
    ;
274
  else if (BUFFERP (readcharfun))
275
    {
276 277
      struct buffer *b = XBUFFER (readcharfun);
      int bytepos = BUF_PT_BYTE (b);
278

279 280 281 282 283
      BUF_PT (b)--;
      if (! NILP (b->enable_multibyte_characters))
	BUF_DEC_POS (b, bytepos);
      else
	bytepos--;
284

285
      BUF_PT_BYTE (b) = bytepos;
286
    }
287
  else if (MARKERP (readcharfun))
288
    {
289 290
      struct buffer *b = XMARKER (readcharfun)->buffer;
      int bytepos = XMARKER (readcharfun)->bytepos;
291

292 293 294 295 296
      XMARKER (readcharfun)->charpos--;
      if (! NILP (b->enable_multibyte_characters))
	BUF_DEC_POS (b, bytepos);
      else
	bytepos--;
297

298
      XMARKER (readcharfun)->bytepos = bytepos;
299
    }
300
  else if (STRINGP (readcharfun))
301 302 303 304 305
    {
      read_from_string_index--;
      read_from_string_index_byte
	= string_char_to_byte (readcharfun, read_from_string_index);
    }
Jim Blandy's avatar
Jim Blandy committed
306 307 308 309 310 311 312
  else if (EQ (readcharfun, Qget_file_char))
    ungetc (c, instream);
  else
    call1 (readcharfun, make_number (c));
}

static Lisp_Object read0 (), read1 (), read_list (), read_vector ();
313
static int read_multibyte ();
Jim Blandy's avatar
Jim Blandy committed
314

315
/* Get a character from the tty.  */
Jim Blandy's avatar
Jim Blandy committed
316

317 318
extern Lisp_Object read_char ();

319 320 321 322 323 324 325 326 327 328 329 330 331 332
/* Read input events until we get one that's acceptable for our purposes.

   If NO_SWITCH_FRAME is non-zero, switch-frame events are stashed
   until we get a character we like, and then stuffed into
   unread_switch_frame.

   If ASCII_REQUIRED is non-zero, we check function key events to see
   if the unmodified version of the symbol has a Qascii_character
   property, and use that character, if present.

   If ERROR_NONASCII is non-zero, we signal an error if the input we
   get isn't an ASCII character with modifiers.  If it's zero but
   ASCII_REQUIRED is non-zero, we just re-read until we get an ASCII
   character.  */
333

334 335 336 337 338 339 340
Lisp_Object
read_filtered_event (no_switch_frame, ascii_required, error_nonascii)
     int no_switch_frame, ascii_required, error_nonascii;
{
#ifdef standalone
  return make_number (getchar ());
#else
341 342 343
  register Lisp_Object val, delayed_switch_frame;

  delayed_switch_frame = Qnil;
344 345 346 347 348

  /* Read until we get an acceptable event.  */
 retry:
  val = read_char (0, 0, 0, Qnil, 0);

349
  if (BUFFERP (val))
350 351
    goto retry;

352
  /* switch-frame events are put off until after the next ASCII
Karl Heuer's avatar
Karl Heuer committed
353
     character.  This is better than signaling an error just because
354 355 356 357 358 359 360 361 362 363 364 365 366 367
     the last characters were typed to a separate minibuffer frame,
     for example.  Eventually, some code which can deal with
     switch-frame events will read it and process it.  */
  if (no_switch_frame
      && EVENT_HAS_PARAMETERS (val)
      && EQ (EVENT_HEAD (val), Qswitch_frame))
    {
      delayed_switch_frame = val;
      goto retry;
    }

  if (ascii_required)
    {
      /* Convert certain symbols to their ASCII equivalents.  */
368
      if (SYMBOLP (val))
369 370 371 372 373 374 375 376 377
	{
	  Lisp_Object tem, tem1, tem2;
	  tem = Fget (val, Qevent_symbol_element_mask);
	  if (!NILP (tem))
	    {
	      tem1 = Fget (Fcar (tem), Qascii_character);
	      /* Merge this symbol's modifier bits
		 with the ASCII equivalent of its basic code.  */
	      if (!NILP (tem1))
378
		XSETFASTINT (val, XINT (tem1) | XINT (Fcar (Fcdr (tem))));
379 380 381 382
	    }
	}
	  
      /* If we don't have a character now, deal with it appropriately.  */
383
      if (!INTEGERP (val))
384 385 386
	{
	  if (error_nonascii)
	    {
387
	      Vunread_command_events = Fcons (val, Qnil);
388 389 390 391 392 393 394 395 396 397 398 399 400 401
	      error ("Non-character input-event");
	    }
	  else
	    goto retry;
	}
    }

  if (! NILP (delayed_switch_frame))
    unread_switch_frame = delayed_switch_frame;

  return val;
#endif
}

Jim Blandy's avatar
Jim Blandy committed
402 403
DEFUN ("read-char", Fread_char, Sread_char, 0, 0, 0,
  "Read a character from the command input (keyboard or macro).\n\
Jim Blandy's avatar
Jim Blandy committed
404 405
It is returned as a number.\n\
If the user generates an event which is not a character (i.e. a mouse\n\
Jim Blandy's avatar
Jim Blandy committed
406 407 408 409 410
click or function key event), `read-char' signals an error.  As an\n\
exception, switch-frame events are put off until non-ASCII events can\n\
be read.\n\
If you want to read non-character events, or ignore them, call\n\
`read-event' or `read-char-exclusive' instead.")
Jim Blandy's avatar
Jim Blandy committed
411 412
  ()
{
413
  return read_filtered_event (1, 1, 1);
Jim Blandy's avatar
Jim Blandy committed
414 415 416 417 418 419
}

DEFUN ("read-event", Fread_event, Sread_event, 0, 0, 0,
  "Read an event object from the input stream.")
  ()
{
420
  return read_filtered_event (0, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
421 422 423 424
}

DEFUN ("read-char-exclusive", Fread_char_exclusive, Sread_char_exclusive, 0, 0, 0,
  "Read a character from the command input (keyboard or macro).\n\
425
It is returned as a number.  Non-character events are ignored.")
Jim Blandy's avatar
Jim Blandy committed
426 427
  ()
{
428
  return read_filtered_event (1, 1, 0);
Jim Blandy's avatar
Jim Blandy committed
429 430 431 432 433 434 435
}

DEFUN ("get-file-char", Fget_file_char, Sget_file_char, 0, 0, 0,
  "Don't use this yourself.")
  ()
{
  register Lisp_Object val;
436
  XSETINT (val, getc (instream));
Jim Blandy's avatar
Jim Blandy committed
437 438 439 440 441
  return val;
}

static void readevalloop ();
static Lisp_Object load_unwind ();
442
static Lisp_Object load_descriptor_unwind ();
Jim Blandy's avatar
Jim Blandy committed
443

444
DEFUN ("load", Fload, Sload, 1, 5, 0,
Jim Blandy's avatar
Jim Blandy committed
445 446 447 448 449 450 451 452 453 454
  "Execute a file of Lisp code named FILE.\n\
First try FILE with `.elc' appended, then try with `.el',\n\
 then try FILE unmodified.\n\
This function searches the directories in `load-path'.\n\
If optional second arg NOERROR is non-nil,\n\
 report no error if FILE doesn't exist.\n\
Print messages at start and end of loading unless\n\
 optional third arg NOMESSAGE is non-nil.\n\
If optional fourth arg NOSUFFIX is non-nil, don't try adding\n\
 suffixes `.elc' or `.el' to the specified name FILE.\n\
455
If optional fifth arg MUST-SUFFIX is non-nil, insist on\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
456
 the suffix `.elc' or `.el'; don't accept just FILE unless\n\
457
 it ends in one of those suffixes or includes a directory name.\n\
Jim Blandy's avatar
Jim Blandy committed
458
Return t if file exists.")
459 460
  (file, noerror, nomessage, nosuffix, must_suffix)
     Lisp_Object file, noerror, nomessage, nosuffix, must_suffix;
Jim Blandy's avatar
Jim Blandy committed
461 462 463 464 465 466 467 468
{
  register FILE *stream;
  register int fd = -1;
  register Lisp_Object lispstream;
  int count = specpdl_ptr - specpdl;
  Lisp_Object temp;
  struct gcpro gcpro1;
  Lisp_Object found;
469 470 471 472
  /* 1 means we printed the ".el is newer" message.  */
  int newer = 0;
  /* 1 means we are loading a compiled file.  */
  int compiled = 0;
473
  Lisp_Object handler;
474
#ifdef DOS_NT
475
  char *dosmode = "rt";
476
#endif /* DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
477

478
  CHECK_STRING (file, 0);
Jim Blandy's avatar
Jim Blandy committed
479

480
  /* If file name is magic, call the handler.  */
481
  handler = Ffind_file_name_handler (file, Qload);
482
  if (!NILP (handler))
483
    return call5 (handler, Qload, file, noerror, nomessage, nosuffix);
484

485 486 487
  /* Do this after the handler to avoid
     the need to gcpro noerror, nomessage and nosuffix.
     (Below here, we care only whether they are nil or not.)  */
488
  file = Fsubstitute_in_file_name (file);
489

Jim Blandy's avatar
Jim Blandy committed
490 491
  /* Avoid weird lossage with null string as arg,
     since it would try to load a directory as a Lisp file */
492
  if (XSTRING (file)->size > 0)
Jim Blandy's avatar
Jim Blandy committed
493
    {
494 495
      int size = XSTRING (file)->size;

496
      GCPRO1 (file);
497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512

      if (! NILP (must_suffix))
	{
	  /* Don't insist on adding a suffix if FILE already ends with one.  */
	  if (size > 3
	      && !strcmp (XSTRING (file)->data + size - 3, ".el"))
	    must_suffix = Qnil;
	  else if (size > 4
		   && !strcmp (XSTRING (file)->data + size - 4, ".elc"))
	    must_suffix = Qnil;
	  /* Don't insist on adding a suffix
	     if the argument includes a directory name.  */
	  else if (! NILP (Ffile_name_directory (file)))
	    must_suffix = Qnil;
	}

513 514 515 516
      fd = openp (Vload_path, file,
		  (!NILP (nosuffix) ? ""
		   : ! NILP (must_suffix) ? ".elc:.el"
		   : ".elc:.el:"),
Jim Blandy's avatar
Jim Blandy committed
517
		  &found, 0);
518
      UNGCPRO;
Jim Blandy's avatar
Jim Blandy committed
519 520 521 522
    }

  if (fd < 0)
    {
Jim Blandy's avatar
Jim Blandy committed
523
      if (NILP (noerror))
Jim Blandy's avatar
Jim Blandy committed
524 525
	while (1)
	  Fsignal (Qfile_error, Fcons (build_string ("Cannot open load file"),
526
				       Fcons (file, Qnil)));
Jim Blandy's avatar
Jim Blandy committed
527 528 529 530
      else
	return Qnil;
    }

531 532 533 534 535 536 537
  /* If FD is 0, that means openp found a remote file.  */
  if (fd == 0)
    {
      handler = Ffind_file_name_handler (found, Qload);
      return call5 (handler, Qload, found, noerror, nomessage, Qt);
    }

Jim Blandy's avatar
Jim Blandy committed
538 539 540 541 542 543
  if (!bcmp (&(XSTRING (found)->data[XSTRING (found)->size - 4]),
	     ".elc", 4))
    {
      struct stat s1, s2;
      int result;

544 545
      compiled = 1;

546
#ifdef DOS_NT
547
      dosmode = "rb";
548
#endif /* DOS_NT */
549
      stat ((char *)XSTRING (found)->data, &s1);
Jim Blandy's avatar
Jim Blandy committed
550
      XSTRING (found)->data[XSTRING (found)->size - 1] = 0;
551
      result = stat ((char *)XSTRING (found)->data, &s2);
Jim Blandy's avatar
Jim Blandy committed
552
      if (result >= 0 && (unsigned) s1.st_mtime < (unsigned) s2.st_mtime)
553
	{
554 555 556 557 558
	  /* Make the progress messages mention that source is newer.  */
	  newer = 1;

	  /* If we won't print another message, mention this anyway.  */
	  if (! NILP (nomessage))
559 560
	    message_with_string ("Source file `%s' newer than byte-compiled file",
				 found, 1);
561
	}
Jim Blandy's avatar
Jim Blandy committed
562 563
      XSTRING (found)->data[XSTRING (found)->size - 1] = 'c';
    }
Karl Heuer's avatar
Karl Heuer committed
564 565 566 567 568 569
  else
    {
      /* We are loading a source file (*.el).  */
      if (!NILP (Vload_source_file_function))
	{
	  close (fd);
570
	  return call4 (Vload_source_file_function, found, file,
Karl Heuer's avatar
Karl Heuer committed
571 572 573 574
			NILP (noerror) ? Qnil : Qt,
			NILP (nomessage) ? Qnil : Qt);
	}
    }
Jim Blandy's avatar
Jim Blandy committed
575

576
#ifdef DOS_NT
577 578
  close (fd);
  stream = fopen ((char *) XSTRING (found)->data, dosmode);
579
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
580
  stream = fdopen (fd, "r");
581
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
582 583 584
  if (stream == 0)
    {
      close (fd);
585
      error ("Failure to create stdio stream for %s", XSTRING (file)->data);
Jim Blandy's avatar
Jim Blandy committed
586 587
    }

588 589 590
  if (! NILP (Vpurify_flag))
    Vpreloaded_file_list = Fcons (file, Vpreloaded_file_list);

591 592
  if (NILP (nomessage))
    {
593
      if (!compiled)
594
	message_with_string ("Loading %s (source)...", file, 1);
595
      else if (newer)
596 597
	message_with_string ("Loading %s (compiled; note, source file is newer)...",
		 file, 1);
598
      else /* The typical case; compiled file newer than source file.  */
599
	message_with_string ("Loading %s...", file, 1);
600
    }
Jim Blandy's avatar
Jim Blandy committed
601

602
  GCPRO1 (file);
603 604 605
  lispstream = Fcons (Qnil, Qnil);
  XSETFASTINT (XCONS (lispstream)->car, (EMACS_UINT)stream >> 16);
  XSETFASTINT (XCONS (lispstream)->cdr, (EMACS_UINT)stream & 0xffff);
Jim Blandy's avatar
Jim Blandy committed
606
  record_unwind_protect (load_unwind, lispstream);
607
  record_unwind_protect (load_descriptor_unwind, load_descriptor_list);
608
  specbind (Qload_file_name, found);
609
  specbind (Qinhibit_file_name_operation, Qnil);
610 611
  load_descriptor_list
    = Fcons (make_number (fileno (stream)), load_descriptor_list);
Jim Blandy's avatar
Jim Blandy committed
612
  load_in_progress++;
613
  readevalloop (Qget_file_char, stream, file, Feval, 0, Qnil);
Jim Blandy's avatar
Jim Blandy committed
614 615 616
  unbind_to (count, Qnil);

  /* Run any load-hooks for this file.  */
617
  temp = Fassoc (file, Vafter_load_alist);
Jim Blandy's avatar
Jim Blandy committed
618
  if (!NILP (temp))
Jim Blandy's avatar
Jim Blandy committed
619 620 621
    Fprogn (Fcdr (temp));
  UNGCPRO;

622 623 624 625 626
  if (saved_doc_string)
    free (saved_doc_string);
  saved_doc_string = 0;
  saved_doc_string_size = 0;

Jim Blandy's avatar
Jim Blandy committed
627
  if (!noninteractive && NILP (nomessage))
628
    {
629
      if (!compiled)
630
	message_with_string ("Loading %s (source)...done", file, 1);
631
      else if (newer)
632 633
	message_with_string ("Loading %s (compiled; note, source file is newer)...done",
		 file, 1);
634
      else /* The typical case; compiled file newer than source file.  */
635
	message_with_string ("Loading %s...done", file, 1);
636
    }
Jim Blandy's avatar
Jim Blandy committed
637 638 639 640 641 642 643
  return Qt;
}

static Lisp_Object
load_unwind (stream)  /* used as unwind-protect function in load */
     Lisp_Object stream;
{
644 645
  fclose ((FILE *) (XFASTINT (XCONS (stream)->car) << 16
		    | XFASTINT (XCONS (stream)->cdr)));
Jim Blandy's avatar
Jim Blandy committed
646 647 648 649
  if (--load_in_progress < 0) load_in_progress = 0;
  return Qnil;
}

650 651 652 653 654
static Lisp_Object
load_descriptor_unwind (oldlist)
     Lisp_Object oldlist;
{
  load_descriptor_list = oldlist;
655
  return Qnil;
656 657 658 659 660 661 662 663
}

/* Close all descriptors in use for Floads.
   This is used when starting a subprocess.  */

void
close_load_descs ()
{
664
#ifndef WINDOWSNT
665 666 667
  Lisp_Object tail;
  for (tail = load_descriptor_list; !NILP (tail); tail = XCONS (tail)->cdr)
    close (XFASTINT (XCONS (tail)->car));
668
#endif
669
}
Jim Blandy's avatar
Jim Blandy committed
670 671 672 673 674 675

static int
complete_filename_p (pathname)
     Lisp_Object pathname;
{
  register unsigned char *s = XSTRING (pathname)->data;
676 677 678
  return (IS_DIRECTORY_SEP (s[0])
	  || (XSTRING (pathname)->size > 2
	      && IS_DEVICE_SEP (s[1]) && IS_DIRECTORY_SEP (s[2]))
Jim Blandy's avatar
Jim Blandy committed
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
#ifdef ALTOS
	  || *s == '@'
#endif
#ifdef VMS
	  || index (s, ':')
#endif /* VMS */
	  );
}

/* Search for a file whose name is STR, looking in directories
   in the Lisp list PATH, and trying suffixes from SUFFIX.
   SUFFIX is a string containing possible suffixes separated by colons.
   On success, returns a file descriptor.  On failure, returns -1.

   EXEC_ONLY nonzero means don't open the files,
   just look for one that is executable.  In this case,
   returns 1 on success.

   If STOREPTR is nonzero, it points to a slot where the name of
   the file actually found should be stored as a Lisp string.
699 700 701 702 703
   nil is stored there on failure.

   If the file we find is remote, return 0
   but store the found remote file name in *STOREPTR.
   We do not check for remote files if EXEC_ONLY is nonzero.  */
Jim Blandy's avatar
Jim Blandy committed
704 705 706 707 708 709 710 711 712 713 714 715 716 717

int
openp (path, str, suffix, storeptr, exec_only)
     Lisp_Object path, str;
     char *suffix;
     Lisp_Object *storeptr;
     int exec_only;
{
  register int fd;
  int fn_size = 100;
  char buf[100];
  register char *fn = buf;
  int absolute = 0;
  int want_size;
718
  Lisp_Object filename;
Jim Blandy's avatar
Jim Blandy committed
719
  struct stat st;
720
  struct gcpro gcpro1;
Jim Blandy's avatar
Jim Blandy committed
721

722
  GCPRO1 (str);
Jim Blandy's avatar
Jim Blandy committed
723 724 725 726 727 728
  if (storeptr)
    *storeptr = Qnil;

  if (complete_filename_p (str))
    absolute = 1;

Jim Blandy's avatar
Jim Blandy committed
729
  for (; !NILP (path); path = Fcdr (path))
Jim Blandy's avatar
Jim Blandy committed
730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757
    {
      char *nsuffix;

      filename = Fexpand_file_name (str, Fcar (path));
      if (!complete_filename_p (filename))
	/* If there are non-absolute elts in PATH (eg ".") */
	/* Of course, this could conceivably lose if luser sets
	   default-directory to be something non-absolute... */
	{
	  filename = Fexpand_file_name (filename, current_buffer->directory);
	  if (!complete_filename_p (filename))
	    /* Give up on this path element! */
	    continue;
	}

      /* Calculate maximum size of any filename made from
	 this path element/specified file name and any possible suffix.  */
      want_size = strlen (suffix) + XSTRING (filename)->size + 1;
      if (fn_size < want_size)
	fn = (char *) alloca (fn_size = 100 + want_size);

      nsuffix = suffix;

      /* Loop over suffixes.  */
      while (1)
	{
	  char *esuffix = (char *) index (nsuffix, ':');
	  int lsuffix = esuffix ? esuffix - nsuffix : strlen (nsuffix);
758
	  Lisp_Object handler;
Jim Blandy's avatar
Jim Blandy committed
759

760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775
	  /* Concatenate path element/specified name with the suffix.
	     If the directory starts with /:, remove that.  */
	  if (XSTRING (filename)->size > 2
	      && XSTRING (filename)->data[0] == '/'
	      && XSTRING (filename)->data[1] == ':')
	    {
	      strncpy (fn, XSTRING (filename)->data + 2,
		       XSTRING (filename)->size - 2);
	      fn[XSTRING (filename)->size - 2] = 0;
	    }
	  else
	    {
	      strncpy (fn, XSTRING (filename)->data, XSTRING (filename)->size);
	      fn[XSTRING (filename)->size] = 0;
	    }

Jim Blandy's avatar
Jim Blandy committed
776 777 778
	  if (lsuffix != 0)  /* Bug happens on CCI if lsuffix is 0.  */
	    strncat (fn, nsuffix, lsuffix);

779 780 781 782 783 784
	  /* Check that the file exists and is not a directory.  */
	  if (absolute)
	    handler = Qnil;
	  else
	    handler = Ffind_file_name_handler (filename, Qfile_exists_p);
	  if (! NILP (handler) && ! exec_only)
Jim Blandy's avatar
Jim Blandy committed
785
	    {
786 787
	      Lisp_Object string;
	      int exists;
Jim Blandy's avatar
Jim Blandy committed
788

789 790 791 792 793 794 795 796
	      string = build_string (fn);
	      exists = ! NILP (exec_only ? Ffile_executable_p (string)
			       : Ffile_readable_p (string));
	      if (exists
		  && ! NILP (Ffile_directory_p (build_string (fn))))
		exists = 0;

	      if (exists)
Jim Blandy's avatar
Jim Blandy committed
797 798 799 800
		{
		  /* We succeeded; return this descriptor and filename.  */
		  if (storeptr)
		    *storeptr = build_string (fn);
801
		  UNGCPRO;
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
		  return 0;
		}
	    }
	  else
	    {
	      int exists = (stat (fn, &st) >= 0
			    && (st.st_mode & S_IFMT) != S_IFDIR);
	      if (exists)
		{
		  /* Check that we can access or open it.  */
		  if (exec_only)
		    fd = (access (fn, X_OK) == 0) ? 1 : -1;
		  else
		    fd = open (fn, O_RDONLY, 0);

		  if (fd >= 0)
		    {
		      /* We succeeded; return this descriptor and filename.  */
		      if (storeptr)
			*storeptr = build_string (fn);
		      UNGCPRO;
		      return fd;
		    }
Jim Blandy's avatar
Jim Blandy committed
825 826 827 828 829 830 831 832
		}
	    }

	  /* Advance to next suffix.  */
	  if (esuffix == 0)
	    break;
	  nsuffix += lsuffix + 1;
	}
833
      if (absolute)
834
	break;
Jim Blandy's avatar
Jim Blandy committed
835 836
    }

837 838
  UNGCPRO;
  return -1;
Jim Blandy's avatar
Jim Blandy committed
839 840 841
}


842 843 844 845 846 847 848 849 850 851 852 853 854
/* Merge the list we've accumulated of globals from the current input source
   into the load_history variable.  The details depend on whether
   the source has an associated file name or not. */

static void
build_load_history (stream, source)
     FILE *stream;
     Lisp_Object source;
{
  register Lisp_Object tail, prev, newelt;
  register Lisp_Object tem, tem2;
  register int foundit, loading;

855 856 857 858
  /* Don't bother recording anything for preloaded files.  */
  if (!NILP (Vpurify_flag))
    return;

859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905
  loading = stream || !NARROWED;

  tail = Vload_history;
  prev = Qnil;
  foundit = 0;
  while (!NILP (tail))
    {
      tem = Fcar (tail);

      /* Find the feature's previous assoc list... */
      if (!NILP (Fequal (source, Fcar (tem))))
	{
	  foundit = 1;

	  /*  If we're loading, remove it. */
	  if (loading)
	    {	  
	      if (NILP (prev))
		Vload_history = Fcdr (tail);
	      else
		Fsetcdr (prev, Fcdr (tail));
	    }

	  /*  Otherwise, cons on new symbols that are not already members.  */
	  else
	    {
	      tem2 = Vcurrent_load_list;

	      while (CONSP (tem2))
		{
		  newelt = Fcar (tem2);

		  if (NILP (Fmemq (newelt, tem)))
		    Fsetcar (tail, Fcons (Fcar (tem),
					  Fcons (newelt, Fcdr (tem))));

		  tem2 = Fcdr (tem2);
		  QUIT;
		}
	    }
	}
      else
	prev = tail;
      tail = Fcdr (tail);
      QUIT;
    }

906 907 908 909 910 911
  /* If we're loading, cons the new assoc onto the front of load-history,
     the most-recently-loaded position.  Also do this if we didn't find
     an existing member for the current source.  */
  if (loading || !foundit)
    Vload_history = Fcons (Fnreverse (Vcurrent_load_list),
			   Vload_history);
912 913
}

Jim Blandy's avatar
Jim Blandy committed
914 915 916 917 918 919 920
Lisp_Object
unreadpure ()	/* Used as unwind-protect function in readevalloop */
{
  read_pure = 0;
  return Qnil;
}

921 922 923 924 925 926 927 928 929 930 931
static Lisp_Object
readevalloop_1 (old)
     Lisp_Object old;
{
  load_convert_to_unibyte = ! NILP (old);
  return Qnil;
}

/* UNIBYTE specifies how to set load_convert_to_unibyte
   for this invocation.  */

Jim Blandy's avatar
Jim Blandy committed
932
static void
933
readevalloop (readcharfun, stream, sourcename, evalfun, printflag, unibyte)
Jim Blandy's avatar
Jim Blandy committed
934
     Lisp_Object readcharfun;
935 936
     FILE *stream;
     Lisp_Object sourcename;
Jim Blandy's avatar
Jim Blandy committed
937 938
     Lisp_Object (*evalfun) ();
     int printflag;
939
     Lisp_Object unibyte;
Jim Blandy's avatar
Jim Blandy committed
940 941 942 943
{
  register int c;
  register Lisp_Object val;
  int count = specpdl_ptr - specpdl;
944
  struct gcpro gcpro1;
945 946 947 948 949 950
  struct buffer *b = 0;

  if (BUFFERP (readcharfun))
    b = XBUFFER (readcharfun);
  else if (MARKERP (readcharfun))
    b = XMARKER (readcharfun)->buffer;
Jim Blandy's avatar
Jim Blandy committed
951 952

  specbind (Qstandard_input, readcharfun);
953
  specbind (Qcurrent_load_list, Qnil);
954 955
  record_unwind_protect (readevalloop_1, load_convert_to_unibyte ? Qt : Qnil);
  load_convert_to_unibyte = !NILP (unibyte);
Jim Blandy's avatar
Jim Blandy committed
956

957 958
  readchar_backlog = 0;

959
  GCPRO1 (sourcename);
960 961 962

  LOADHIST_ATTACH (sourcename);

Jim Blandy's avatar
Jim Blandy committed
963 964
  while (1)
    {
965 966 967
      if (b != 0 && NILP (b->name))
	error ("Reading from killed buffer");

Jim Blandy's avatar
Jim Blandy committed
968 969 970 971 972 973 974 975
      instream = stream;
      c = READCHAR;
      if (c == ';')
	{
	  while ((c = READCHAR) != '\n' && c != -1);
	  continue;
	}
      if (c < 0) break;
976 977 978 979

      /* Ignore whitespace here, so we can detect eof.  */
      if (c == ' ' || c == '\t' || c == '\n' || c == '\f' || c == '\r')
	continue;
Jim Blandy's avatar
Jim Blandy committed
980

Jim Blandy's avatar
Jim Blandy committed
981
      if (!NILP (Vpurify_flag) && c == '(')
Jim Blandy's avatar
Jim Blandy committed
982
	{
983
	  int count1 = specpdl_ptr - specpdl;
Jim Blandy's avatar
Jim Blandy committed
984 985
	  record_unwind_protect (unreadpure, Qnil);
	  val = read_list (-1, readcharfun);
986
	  unbind_to (count1, Qnil);
Jim Blandy's avatar
Jim Blandy committed
987 988 989 990
	}
      else
	{
	  UNREAD (c);
991
	  read_objects = Qnil;
992 993 994 995
	  if (NILP (Vload_read_function))
	    val = read0 (readcharfun);
	  else
	    val = call1 (Vload_read_function, readcharfun);
Jim Blandy's avatar
Jim Blandy committed
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
	}

      val = (*evalfun) (val);
      if (printflag)
	{
	  Vvalues = Fcons (val, Vvalues);
	  if (EQ (Vstandard_output, Qt))
	    Fprin1 (val, Qnil);
	  else
	    Fprint (val, Qnil);
	}
    }

1009 1010 1011
  build_load_history (stream, sourcename);
  UNGCPRO;

Jim Blandy's avatar
Jim Blandy committed
1012 1013 1014 1015 1016
  unbind_to (count, Qnil);
}

#ifndef standalone

1017
DEFUN ("eval-buffer", Feval_buffer, Seval_buffer, 0, 4, "",
1018 1019 1020 1021
  "Execute the current buffer as Lisp code.\n\
Programs can pass two arguments, BUFFER and PRINTFLAG.\n\
BUFFER is the buffer to evaluate (nil means use current buffer).\n\
PRINTFLAG controls printing of output:\n\
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1022 1023
nil means discard it; anything else is stream for print.\n\
\n\
1024 1025 1026
If the optional third argument FILENAME is non-nil,\n\
it specifies the file name to use for `load-history'.\n\
\n\
Richard M. Stallman's avatar
Richard M. Stallman committed
1027
This function preserves the position of point.")
1028 1029
  (buffer, printflag, filename, unibyte)
     Lisp_Object buffer, printflag, filename, unibyte;
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1030 1031 1032 1033
{
  int count = specpdl_ptr - specpdl;
  Lisp_Object tem, buf;

1034
  if (NILP (buffer))
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1035 1036
    buf = Fcurrent_buffer ();
  else
1037
    buf = Fget_buffer (buffer);
Jim Blandy's avatar
Jim Blandy committed
1038
  if (NILP (buf))
1039
    error ("No such buffer");
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1040

Jim Blandy's avatar
Jim Blandy committed
1041
  if (NILP (printflag))
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1042 1043 1044
    tem = Qsymbolp;
  else
    tem = printflag;
1045 1046 1047 1048

  if (NILP (filename))
    filename = XBUFFER (buf)->filename;

Joseph Arceneaux's avatar
Joseph Arceneaux committed
1049 1050 1051
  specbind (Qstandard_output, tem);
  record_unwind_protect (save_excursion_restore, save_excursion_save ());
  BUF_SET_PT (XBUFFER (buf), BUF_BEGV (XBUFFER (buf)));
1052
  readevalloop (buf, 0, filename, Feval, !NILP (printflag), unibyte);
1053
  unbind_to (count, Qnil);
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1054 1055 1056 1057 1058

  return Qnil;
}

#if 0
1059
XDEFUN ("eval-current-buffer", Feval_current_buffer, Seval_current_buffer, 0, 1, "",
Jim Blandy's avatar
Jim Blandy committed
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
  "Execute the current buffer as Lisp code.\n\
Programs can pass argument PRINTFLAG which controls printing of output:\n\
nil means discard it; anything else is stream for print.\n\
\n\
If there is no error, point does not move.  If there is an error,\n\
point remains at the end of the last character read from the buffer.")
  (printflag)
     Lisp_Object printflag;
{
  int count = specpdl_ptr - specpdl;
1070 1071 1072
  Lisp_Object tem, cbuf;

  cbuf = Fcurrent_buffer ()
Jim Blandy's avatar
Jim Blandy committed
1073

Jim Blandy's avatar
Jim Blandy committed
1074
  if (NILP (printflag))
Jim Blandy's avatar
Jim Blandy committed
1075 1076 1077 1078 1079 1080
    tem = Qsymbolp;
  else
    tem = printflag;
  specbind (Qstandard_output, tem);
  record_unwind_protect (save_excursion_restore, save_excursion_save ());
  SET_PT (BEGV);
1081 1082
  readevalloop (cbuf, 0, XBUFFER (cbuf)->filename, Feval,
		!NILP (printflag), Qnil);
Jim Blandy's avatar
Jim Blandy committed
1083 1084
  return unbind_to (count, Qnil);
}
Joseph Arceneaux's avatar
Joseph Arceneaux committed
1085
#endif
Jim Blandy's avatar
Jim Blandy committed
1086 1087 1088 1089 1090 1091 1092 1093 1094

DEFUN ("eval-region", Feval_region, Seval_region, 2, 3, "r",
  "Execute the region as Lisp code.\n\
When called from programs, expects two arguments,\n\
giving starting and ending indices in the current buffer\n\
of the text to be executed.\n\
Programs can pass third argument PRINTFLAG which controls output:\n\
nil means discard it; anything else is stream for printing it.\n\
\n\
1095
This function does not move point.")
1096 1097
  (start, end, printflag)
     Lisp_Object start, end, printflag;
Jim Blandy's avatar
Jim Blandy committed
1098 1099
{
  int count = specpdl_ptr - specpdl;
1100 1101 1102
  Lisp_Object tem, cbuf;

  cbuf = Fcurrent_buffer ();
Jim Blandy's avatar
Jim Blandy committed
1103

Jim Blandy's avatar
Jim Blandy committed
1104
  if (NILP (printflag))
Jim Blandy's avatar
Jim Blandy committed
1105 1106 1107 1108 1109
    tem = Qsymbolp;
  else
    tem = printflag;
  specbind (Qstandard_output, tem);

Jim Blandy's avatar
Jim Blandy committed
1110
  if (NILP (printflag))
Jim Blandy's avatar
Jim Blandy committed
1111 1112 1113
    record_unwind_protect (save_excursion_restore, save_excursion_save ());
  record_unwind_protect (save_restriction_restore, save_restriction_save ());

1114 1115 1116
  /* This both uses start and checks its type.  */
  Fgoto_char (start);
  Fnarrow_to_region (make_number (BEGV), end);
1117 1118
  readevalloop (cbuf, 0, XBUFFER (cbuf)->filename, Feval,
		!NILP (printflag), Qnil);
Jim Blandy's avatar
Jim Blandy committed
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134

  return unbind_to (count, Qnil);
}

#endif /* standalone */

DEFUN ("read", Fread, Sread, 0, 1, 0,
  "Read one Lisp expression as text from STREAM, return as Lisp object.\n\
If STREAM is nil, use the value of `standard-input' (which see).\n\
STREAM or the value of `standard-input' may be:\n\
 a buffer (read from point and advance it)\n\
 a marker (read from where it points and advance it)\n\
 a function (call it with no arguments for each character,\n\
     call it with a char as argument to push a char back)\n\
 a string (takes text from string, starting at the beginning)\n\
 t (read text line using minibuffer and use it).")
1135 1136
  (stream)
     Lisp_Object stream;
Jim Blandy's avatar
Jim Blandy committed
1137 1138 1139
{
  extern Lisp_Object Fread_minibuffer ();

1140 1141 1142 1143
  if (NILP (stream))
    stream = Vstandard_input;
  if (EQ (stream, Qt))
    stream = Qread_char;
Jim Blandy's avatar
Jim Blandy committed
1144

1145
  readchar_backlog = 0;
1146
  new_backquote_flag = 0;
1147
  read_objects = Qnil;