Initial revision

1 files changed, 1514 insertions, 0 deletions

diff --git a/src/lread.c b/src/lread.c
new file mode 100644
index 00000000000..14f05371abb
--- /dev/null
+++ b/src/lread.c
@@ -0,0 +1,1514 @@
+/* Lisp parsing and input streams.
+   Copyright (C) 1985, 1986, 1987, 1988, 1989 Free Software Foundation, Inc.
+
+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
+the Free Software Foundation; either version 1, or (at your option)
+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
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#undef NULL
+#include "config.h"
+#include "lisp.h"
+
+#ifndef standalone
+#include "buffer.h"
+#include "paths.h"
+#include "commands.h"
+#endif
+
+#ifdef lint
+#include <sys/inode.h>
+#endif /* lint */
+
+#ifndef X_OK
+#define X_OK 01
+#endif
+
+#ifdef LISP_FLOAT_TYPE
+#include <math.h>
+#endif /* LISP_FLOAT_TYPE */
+
+Lisp_Object Qread_char, Qget_file_char, Qstandard_input;
+Lisp_Object Qvariable_documentation, Vvalues, Vstandard_input, Vafter_load_alist;
+
+/* non-zero if inside `load' */
+int load_in_progress;
+
+/* Search path for files to be loaded. */
+Lisp_Object Vload_path;
+
+/* File for get_file_char to read from.  Use by load */
+static FILE *instream;
+
+/* When nonzero, read conses in pure space */
+static int read_pure;
+
+/* For use within read-from-string (this reader is non-reentrant!!) */
+static int read_from_string_index;
+static int read_from_string_limit;
+
+/* Handle unreading and rereading of characters.
+   Write READCHAR to read a character,
+   UNREAD(c) to unread c to be read again. */
+
+#define READCHAR readchar (readcharfun)
+#define UNREAD(c) unreadchar (readcharfun, c)
+
+static int
+readchar (readcharfun)
+     Lisp_Object readcharfun;
+{
+  Lisp_Object tem;
+  register struct buffer *inbuffer;
+  register int c, mpos;
+
+  if (XTYPE (readcharfun) == Lisp_Buffer)
+    {
+      inbuffer = XBUFFER (readcharfun);
+
+      if (BUF_PT (inbuffer) >= BUF_ZV (inbuffer))
+	return -1;
+      c = *(unsigned char *) BUF_CHAR_ADDRESS (inbuffer, BUF_PT (inbuffer));
+      SET_BUF_PT (inbuffer, BUF_PT (inbuffer) + 1);
+
+      return c;
+    }
+  if (XTYPE (readcharfun) == Lisp_Marker)
+    {
+      inbuffer = XMARKER (readcharfun)->buffer;
+
+      mpos = marker_position (readcharfun);
+
+      if (mpos > BUF_ZV (inbuffer) - 1)
+	return -1;
+      c = *(unsigned char *) BUF_CHAR_ADDRESS (inbuffer, mpos);
+      if (mpos != BUF_GPT (inbuffer))
+	XMARKER (readcharfun)->bufpos++;
+      else
+	Fset_marker (readcharfun, make_number (mpos + 1),
+		     Fmarker_buffer (readcharfun));
+      return c;
+    }
+  if (EQ (readcharfun, Qget_file_char))
+    return getc (instream);
+
+  if (XTYPE (readcharfun) == Lisp_String)
+    {
+      register int c;
+      /* This used to be return of a conditional expression,
+	 but that truncated -1 to a char on VMS.  */
+      if (read_from_string_index < read_from_string_limit)
+	c = XSTRING (readcharfun)->data[read_from_string_index++];
+      else
+	c = -1;
+      return c;
+    }
+
+  tem = call0 (readcharfun);
+
+  if (NULL (tem))
+    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;
+{
+  if (XTYPE (readcharfun) == Lisp_Buffer)
+    {
+      if (XBUFFER (readcharfun) == current_buffer)
+	SET_PT (point - 1);
+      else
+	SET_BUF_PT (XBUFFER (readcharfun), BUF_PT (XBUFFER (readcharfun)) - 1);
+    }
+  else if (XTYPE (readcharfun) == Lisp_Marker)
+    XMARKER (readcharfun)->bufpos--;
+  else if (XTYPE (readcharfun) == Lisp_String)
+    read_from_string_index--;
+  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 ();
+
+/* get a character from the tty */
+
+DEFUN ("read-char", Fread_char, Sread_char, 0, 0, 0,
+  "Read a character from the command input (keyboard or macro).\n\
+It is returned as a number.")
+  ()
+{
+  register Lisp_Object val;
+
+#ifndef standalone
+  val = read_char (0);
+  if (XTYPE (val) != Lisp_Int)
+    {
+      unread_command_char = val;
+      error ("Object read was not a character");
+    }
+#else
+  val = getchar ();
+#endif
+
+  return val;
+}
+
+#ifdef HAVE_X_WINDOWS
+DEFUN ("read-event", Fread_event, Sread_event, 0, 0, 0,
+  "Read an event object from the input stream.")
+  ()
+{
+  register Lisp_Object val;
+
+  val = read_char (0);
+  return val;
+}
+
+DEFUN ("read-char-exclusive", Fread_char_exclusive, Sread_char_exclusive, 0, 0, 0,
+  "Read a character from the command input (keyboard or macro).\n\
+It is returned as a number.  Non character events are ignored.")
+  ()
+{
+  register Lisp_Object val;
+
+#ifndef standalone
+  val = read_char (0);
+  while (XTYPE (val) != Lisp_Int)
+    val = read_char (0);
+#else
+  val = getchar ();
+#endif
+
+  return val;
+}
+#endif	/* HAVE_X_WINDOWS */
+
+DEFUN ("get-file-char", Fget_file_char, Sget_file_char, 0, 0, 0,
+  "Don't use this yourself.")
+  ()
+{
+  register Lisp_Object val;
+  XSET (val, Lisp_Int, getc (instream));
+  return val;
+}
+
+static void readevalloop ();
+static Lisp_Object load_unwind ();
+
+DEFUN ("load", Fload, Sload, 1, 4, 0,
+  "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\
+Return t if file exists.")
+  (str, noerror, nomessage, nosuffix)
+     Lisp_Object str, noerror, nomessage, nosuffix;
+{
+  register FILE *stream;
+  register int fd = -1;
+  register Lisp_Object lispstream;
+  register FILE **ptr;
+  int count = specpdl_ptr - specpdl;
+  Lisp_Object temp;
+  struct gcpro gcpro1;
+  Lisp_Object found;
+
+  CHECK_STRING (str, 0);
+  str = Fsubstitute_in_file_name (str);
+
+  /* Avoid weird lossage with null string as arg,
+     since it would try to load a directory as a Lisp file */
+  if (XSTRING (str)->size > 0)
+    {
+      fd = openp (Vload_path, str, !NULL (nosuffix) ? "" : ".elc:.el:",
+		  &found, 0);
+    }
+
+  if (fd < 0)
+    {
+      if (NULL (noerror))
+	while (1)
+	  Fsignal (Qfile_error, Fcons (build_string ("Cannot open load file"),
+				       Fcons (str, Qnil)));
+      else
+	return Qnil;
+    }
+
+  if (!bcmp (&(XSTRING (found)->data[XSTRING (found)->size - 4]),
+	     ".elc", 4))
+    {
+      struct stat s1, s2;
+      int result;
+
+      stat (XSTRING (found)->data, &s1);
+      XSTRING (found)->data[XSTRING (found)->size - 1] = 0;
+      result = stat (XSTRING (found)->data, &s2);
+      if (result >= 0 && (unsigned) s1.st_mtime < (unsigned) s2.st_mtime)
+	message ("Source file `%s' newer than byte-compiled file",
+		 XSTRING (found)->data);
+      XSTRING (found)->data[XSTRING (found)->size - 1] = 'c';
+    }
+
+  stream = fdopen (fd, "r");
+  if (stream == 0)
+    {
+      close (fd);
+      error ("Failure to create stdio stream for %s", XSTRING (str)->data);
+    }
+
+  if (NULL (nomessage))
+    message ("Loading %s...", XSTRING (str)->data);
+
+  GCPRO1 (str);
+  /* We may not be able to store STREAM itself as a Lisp_Object pointer
+     since that is guaranteed to work only for data that has been malloc'd.
+     So malloc a full-size pointer, and record the address of that pointer.  */
+  ptr = (FILE **) xmalloc (sizeof (FILE *));
+  *ptr = stream;
+  XSET (lispstream, Lisp_Internal_Stream, (int) ptr);
+  record_unwind_protect (load_unwind, lispstream);
+  load_in_progress++;
+  readevalloop (Qget_file_char, stream, Feval, 0);
+  unbind_to (count, Qnil);
+
+  /* Run any load-hooks for this file.  */
+  temp = Fassoc (str, Vafter_load_alist);
+  if (!NULL (temp))
+    Fprogn (Fcdr (temp));
+  UNGCPRO;
+
+  if (!noninteractive && NULL (nomessage))
+    message ("Loading %s...done", XSTRING (str)->data);
+  return Qt;
+}
+
+static Lisp_Object
+load_unwind (stream)  /* used as unwind-protect function in load */
+     Lisp_Object stream;
+{
+  fclose (*(FILE **) XSTRING (stream));
+  free (XPNTR (stream));
+  if (--load_in_progress < 0) load_in_progress = 0;
+  return Qnil;
+}
+
+
+static int
+complete_filename_p (pathname)
+     Lisp_Object pathname;
+{
+  register unsigned char *s = XSTRING (pathname)->data;
+  return (*s == '/'
+#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.
+   Nil is stored there on failure.  */
+
+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;
+  register Lisp_Object filename;
+  struct stat st;
+
+  if (storeptr)
+    *storeptr = Qnil;
+
+  if (complete_filename_p (str))
+    absolute = 1;
+
+  for (; !NULL (path); path = Fcdr (path))
+    {
+      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);
+
+	  /* Concatenate path element/specified name with the suffix.  */
+	  strncpy (fn, XSTRING (filename)->data, XSTRING (filename)->size);
+	  fn[XSTRING (filename)->size] = 0;
+	  if (lsuffix != 0)  /* Bug happens on CCI if lsuffix is 0.  */
+	    strncat (fn, nsuffix, lsuffix);
+
+	  /* Ignore file if it's a directory.  */
+	  if (stat (fn, &st) >= 0
+	      && (st.st_mode & S_IFMT) != S_IFDIR)
+	    {
+	      /* Check that we can access or open it.  */
+	      if (exec_only)
+		fd = (access (fn, X_OK) == 0) ? 1 : -1;
+	      else
+		fd = open (fn, 0, 0);
+
+	      if (fd >= 0)
+		{
+		  /* We succeeded; return this descriptor and filename.  */
+		  if (storeptr)
+		    *storeptr = build_string (fn);
+		  return fd;
+		}
+	    }
+
+	  /* Advance to next suffix.  */
+	  if (esuffix == 0)
+	    break;
+	  nsuffix += lsuffix + 1;
+	}
+      if (absolute) return -1;
+    }
+
+  return -1;
+}
+
+
+Lisp_Object
+unreadpure ()	/* Used as unwind-protect function in readevalloop */
+{
+  read_pure = 0;
+  return Qnil;
+}
+
+static void
+readevalloop (readcharfun, stream, evalfun, printflag)
+     Lisp_Object readcharfun;
+     FILE *stream;     
+     Lisp_Object (*evalfun) ();
+     int printflag;
+{
+  register int c;
+  register Lisp_Object val;
+  int count = specpdl_ptr - specpdl;
+
+  specbind (Qstandard_input, readcharfun);
+
+  while (1)
+    {
+      instream = stream;
+      c = READCHAR;
+      if (c == ';')
+	{
+	  while ((c = READCHAR) != '\n' && c != -1);
+	  continue;
+	}
+      if (c < 0) break;
+      if (c == ' ' || c == '\t' || c == '\n' || c == '\f') continue;
+
+      if (!NULL (Vpurify_flag) && c == '(')
+	{
+	  record_unwind_protect (unreadpure, Qnil);
+	  val = read_list (-1, readcharfun);
+	  unbind_to (count + 1, Qnil);
+	}
+      else
+	{
+	  UNREAD (c);
+	  val = read0 (readcharfun);
+	}
+
+      val = (*evalfun) (val);
+      if (printflag)
+	{
+	  Vvalues = Fcons (val, Vvalues);
+	  if (EQ (Vstandard_output, Qt))
+	    Fprin1 (val, Qnil);
+	  else
+	    Fprint (val, Qnil);
+	}
+    }
+
+  unbind_to (count, Qnil);
+}
+
+#ifndef standalone
+
+DEFUN ("eval-current-buffer", Feval_current_buffer, Seval_current_buffer, 0, 1, "",
+  "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;
+  Lisp_Object tem;
+
+  if (NULL (printflag))
+    tem = Qsymbolp;
+  else
+    tem = printflag;
+  specbind (Qstandard_output, tem);
+  record_unwind_protect (save_excursion_restore, save_excursion_save ());
+  SET_PT (BEGV);
+  readevalloop (Fcurrent_buffer (), 0, Feval, !NULL (printflag));
+  return unbind_to (count, Qnil);
+}
+
+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\
+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.")
+  (b, e, printflag)
+     Lisp_Object b, e, printflag;
+{
+  int count = specpdl_ptr - specpdl;
+  Lisp_Object tem;
+
+  if (NULL (printflag))
+    tem = Qsymbolp;
+  else
+    tem = printflag;
+  specbind (Qstandard_output, tem);
+
+  if (NULL (printflag))
+    record_unwind_protect (save_excursion_restore, save_excursion_save ());
+  record_unwind_protect (save_restriction_restore, save_restriction_save ());
+
+  /* This both uses b and checks its type.  */
+  Fgoto_char (b);
+  Fnarrow_to_region (make_number (BEGV), e);
+  readevalloop (Fcurrent_buffer (), 0, Feval, !NULL (printflag));
+
+  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).")
+  (readcharfun)
+     Lisp_Object readcharfun;
+{
+  extern Lisp_Object Fread_minibuffer ();
+
+  if (NULL (readcharfun))
+    readcharfun = Vstandard_input;
+  if (EQ (readcharfun, Qt))
+    readcharfun = Qread_char;
+
+#ifndef standalone
+  if (EQ (readcharfun, Qread_char))
+    return Fread_minibuffer (build_string ("Lisp expression: "), Qnil);
+#endif
+
+  if (XTYPE (readcharfun) == Lisp_String)
+    return Fcar (Fread_from_string (readcharfun, Qnil, Qnil));
+
+  return read0 (readcharfun);
+}
+
+DEFUN ("read-from-string", Fread_from_string, Sread_from_string, 1, 3, 0,
+  "Read one Lisp expression which is represented as text by STRING.\n\
+Returns a cons: (OBJECT-READ . FINAL-STRING-INDEX).\n\
+START and END optionally delimit a substring of STRING from which to read;\n\
+ they default to 0 and (length STRING) respectively.")
+  (string, start, end)
+     Lisp_Object string, start, end;
+{
+  int startval, endval;
+  Lisp_Object tem;
+
+  CHECK_STRING (string,0);
+
+  if (NULL (end))
+    endval = XSTRING (string)->size;
+  else
+    { CHECK_NUMBER (end,2);
+      endval = XINT (end);
+      if (endval < 0 || endval > XSTRING (string)->size)
+	args_out_of_range (string, end);
+    }
+
+  if (NULL (start))
+    startval = 0;
+  else
+    { CHECK_NUMBER (start,1);
+      startval = XINT (start);
+      if (startval < 0 || startval > endval)
+	args_out_of_range (string, start);
+    }
+
+  read_from_string_index = startval;
+  read_from_string_limit = endval;
+
+  tem = read0 (string);
+  return Fcons (tem, make_number (read_from_string_index));
+}
+
+/* Use this for recursive reads, in contexts where internal tokens are not allowed. */
+
+static Lisp_Object
+read0 (readcharfun)
+     Lisp_Object readcharfun;
+{
+  register Lisp_Object val;
+  char c;
+
+  val = read1 (readcharfun);
+  if (XTYPE (val) == Lisp_Internal)
+    {
+      c = XINT (val);
+      return Fsignal (Qinvalid_read_syntax, Fcons (make_string (&c, 1), Qnil));
+    }
+
+  return val;
+}
+
+static int read_buffer_size;
+static char *read_buffer;
+
+static int
+read_escape (readcharfun)
+     Lisp_Object readcharfun;
+{
+  register int c = READCHAR;
+  switch (c)
+    {
+    case 'a':
+      return '\a';
+    case 'b':
+      return '\b';
+    case 'e':
+      return 033;
+    case 'f':
+      return '\f';
+    case 'n':
+      return '\n';
+    case 'r':
+      return '\r';
+    case 't':
+      return '\t';
+    case 'v':
+      return '\v';
+    case '\n':
+      return -1;
+
+    case 'M':
+      c = READCHAR;
+      if (c != '-')
+	error ("Invalid escape character syntax");
+      c = READCHAR;
+      if (c == '\\')
+	c = read_escape (readcharfun);
+      return c | 0200;
+
+    case 'C':
+      c = READCHAR;
+      if (c != '-')
+	error ("Invalid escape character syntax");
+    case '^':
+      c = READCHAR;
+      if (c == '\\')
+	c = read_escape (readcharfun);
+      if (c == '?')
+	return 0177;
+      else
+	return (c & (0200 | 037));
+
+    case '0':
+    case '1':
+    case '2':
+    case '3':
+    case '4':
+    case '5':
+    case '6':
+    case '7':
+      /* An octal escape, as in ANSI C.  */
+      {
+	register int i = c - '0';
+	register int count = 0;
+	while (++count < 3)
+	  {
+	    if ((c = READCHAR) >= '0' && c <= '7')
+	      {
+		i *= 8;
+		i += c - '0';
+	      }
+	    else
+	      {
+		UNREAD (c);
+		break;
+	      }
+	  }
+	return i;
+      }
+
+    case 'x':
+      /* A hex escape, as in ANSI C.  */
+      {
+	int i = 0;
+	while (1)
+	  {
+	    c = READCHAR;
+	    if (c >= '0' && c <= '9')
+	      {
+		i *= 16;
+		i += c - '0';
+	      }
+	    else if ((c >= 'a' && c <= 'f')
+		     || (c >= 'A' && c <= 'F'))
+	      {
+		i *= 16;
+		if (c >= 'a' && c <= 'f')
+		  i += c - 'a' + 10;
+		else
+		  i += c - 'A' + 10;
+	      }
+	    else
+	      {
+		UNREAD (c);
+		break;
+	      }
+	  }
+	return i;
+      }
+
+    default:
+      return c;
+    }
+}
+
+static Lisp_Object
+read1 (readcharfun)
+     register Lisp_Object readcharfun;
+{
+  register int c;
+
+ retry:
+
+  c = READCHAR;
+  if (c < 0) return Fsignal (Qend_of_file, Qnil);
+
+  switch (c)
+    {
+    case '(':
+      return read_list (0, readcharfun);
+
+    case '[':
+      return read_vector (readcharfun);
+
+    case ')':
+    case ']':
+    case '.':
+      {
+	register Lisp_Object val;
+	XSET (val, Lisp_Internal, c);
+	return val;
+      }
+
+    case '#':
+      return Fsignal (Qinvalid_read_syntax, Fcons (make_string ("#", 1), Qnil));
+
+    case ';':
+      while ((c = READCHAR) >= 0 && c != '\n');
+      goto retry;
+
+    case '\'':
+      {
+	return Fcons (Qquote, Fcons (read0 (readcharfun), Qnil));
+      }
+
+    case '?':
+      {
+	register Lisp_Object val;
+
+	c = READCHAR;
+	if (c < 0) return Fsignal (Qend_of_file, Qnil);
+
+	if (c == '\\')
+	  XSET (val, Lisp_Int, read_escape (readcharfun));
+	else
+	  XSET (val, Lisp_Int, c);
+
+	return val;
+      }
+
+    case '\"':
+      {
+	register char *p = read_buffer;
+	register char *end = read_buffer + read_buffer_size;
+	register int c;
+	int cancel = 0;
+
+	while ((c = READCHAR) >= 0
+	       && c != '\"')
+	  {
+	    if (p == end)
+	      {
+		char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
+		p += new - read_buffer;
+		read_buffer += new - read_buffer;
+		end = read_buffer + read_buffer_size;
+	      }
+	    if (c == '\\')
+	      c = read_escape (readcharfun);
+	    /* c is -1 if \ newline has just been seen */
+	    if (c < 0)
+	      {
+		if (p == read_buffer)
+		  cancel = 1;
+	      }
+	    else
+	      *p++ = c;
+	  }
+	if (c < 0) return Fsignal (Qend_of_file, Qnil);
+
+	/* If purifying, and string starts with \ newline,
+	   return zero instead.  This is for doc strings
+	   that we are really going to find in etc/DOC.nn.nn  */
+	if (!NULL (Vpurify_flag) && NULL (Vdoc_file_name) && cancel)
+	  return make_number (0);
+
+	if (read_pure)
+	  return make_pure_string (read_buffer, p - read_buffer);
+	else
+	  return make_string (read_buffer, p - read_buffer);
+      }
+
+    default:
+      if (c <= 040) goto retry;
+      {
+	register char *p = read_buffer;
+
+	{
+	  register char *end = read_buffer + read_buffer_size;
+
+	  while (c > 040 && 
+		 !(c == '\"' || c == '\'' || c == ';' || c == '?'
+		   || c == '(' || c == ')'
+#ifndef LISP_FLOAT_TYPE		/* we need to see <number><dot><number> */
+		   || c =='.'
+#endif /* not LISP_FLOAT_TYPE */
+		   || c == '[' || c == ']' || c == '#'
+		   ))
+	    {
+	      if (p == end)
+		{
+		  register char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
+		  p += new - read_buffer;
+		  read_buffer += new - read_buffer;
+		  end = read_buffer + read_buffer_size;
+		}
+	      if (c == '\\')
+		c = READCHAR;
+	      *p++ = c;
+	      c = READCHAR;
+	    }
+
+	  if (p == end)
+	    {
+	      char *new = (char *) xrealloc (read_buffer, read_buffer_size *= 2);
+	      p += new - read_buffer;
+	      read_buffer += new - read_buffer;
+/*	      end = read_buffer + read_buffer_size;  */
+	    }
+	  *p = 0;
+	  if (c >= 0)
+	    UNREAD (c);
+	}
+
+	/* Is it an integer? */
+	{
+	  register char *p1;
+	  register Lisp_Object val;
+	  p1 = read_buffer;
+	  if (*p1 == '+' || *p1 == '-') p1++;
+	  if (p1 != p)
+	    {
+	      while (p1 != p && (c = *p1) >= '0' && c <= '9') p1++;
+	      if (p1 == p)
+		/* It is. */
+		{
+		  XSET (val, Lisp_Int, atoi (read_buffer));
+		  return val;
+		}
+	    }
+#ifdef LISP_FLOAT_TYPE
+	  if (isfloat_string (read_buffer))
+	    return make_float (atof (read_buffer));
+#endif
+	}
+
+	return intern (read_buffer);
+      }
+    }
+}
+
+#ifdef LISP_FLOAT_TYPE
+
+#include <ctype.h>
+#define LEAD_INT 1
+#define DOT_CHAR 2
+#define TRAIL_INT 4
+#define E_CHAR 8
+#define EXP_INT 16
+
+int
+isfloat_string (cp)
+     register char *cp;
+{
+  register state;
+  
+  state = 0;
+  if (*cp == '+' || *cp == '-')
+    cp++;
+
+  if (isdigit(*cp))
+    {
+      state |= LEAD_INT;
+      while (isdigit (*cp))
+	cp ++;
+    }
+  if (*cp == '.')
+    {
+      state |= DOT_CHAR;
+      cp++;
+    }
+  if (isdigit(*cp))
+    {
+      state |= TRAIL_INT;
+      while (isdigit (*cp))
+	cp++;
+    }
+  if (*cp == 'e')
+    {
+      state |= E_CHAR;
+      cp++;
+    }
+  if ((*cp == '+') || (*cp == '-'))
+    cp++;
+
+  if (isdigit (*cp))
+    {
+      state |= EXP_INT;
+      while (isdigit (*cp))
+	cp++;
+    }
+  return (*cp == 0
+	  && (state == (LEAD_INT|DOT_CHAR|TRAIL_INT)
+	      || state == (LEAD_INT|E_CHAR|EXP_INT)
+	      || state == (LEAD_INT|DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)));
+}
+#endif /* LISP_FLOAT_TYPE */
+
+static Lisp_Object
+read_vector (readcharfun)
+     Lisp_Object readcharfun;
+{
+  register int i;
+  register int size;
+  register Lisp_Object *ptr;
+  register Lisp_Object tem, vector;
+  register struct Lisp_Cons *otem;
+  Lisp_Object len;
+
+  tem = read_list (1, readcharfun);
+  len = Flength (tem);
+  vector = (read_pure ? make_pure_vector (XINT (len)) : Fmake_vector (len, Qnil));
+
+
+  size = XVECTOR (vector)->size;
+  ptr = XVECTOR (vector)->contents;
+  for (i = 0; i < size; i++)
+    {
+      ptr[i] = read_pure ? Fpurecopy (Fcar (tem)) : Fcar (tem);
+      otem = XCONS (tem);
+      tem = Fcdr (tem);
+      free_cons (otem);
+    }
+  return vector;
+}
+  
+/* flag = 1 means check for ] to terminate rather than ) and .
+   flag = -1 means check for starting with defun
+    and make structure pure.  */
+
+static Lisp_Object
+read_list (flag, readcharfun)
+     int flag;
+     register Lisp_Object readcharfun;
+{
+  /* -1 means check next element for defun,
+     0 means don't check,
+     1 means already checked and found defun. */
+  int defunflag = flag < 0 ? -1 : 0;
+  Lisp_Object val, tail;
+  register Lisp_Object elt, tem;
+  struct gcpro gcpro1, gcpro2;
+
+  val = Qnil;
+  tail = Qnil;
+
+  while (1)
+    {
+      GCPRO2 (val, tail);
+      elt = read1 (readcharfun);
+      UNGCPRO;
+      if (XTYPE (elt) == Lisp_Internal)
+	{
+	  if (flag > 0)
+	    {
+	      if (XINT (elt) == ']')
+		return val;
+	      return Fsignal (Qinvalid_read_syntax, Fcons (make_string (") or . in a vector", 18), Qnil));
+	    }
+	  if (XINT (elt) == ')')
+	    return val;
+	  if (XINT (elt) == '.')
+	    {
+	      GCPRO2 (val, tail);
+	      if (!NULL (tail))
+		XCONS (tail)->cdr = read0 (readcharfun);
+	      else
+		val = read0 (readcharfun);
+	      elt = read1 (readcharfun);
+	      UNGCPRO;
+	      if (XTYPE (elt) == Lisp_Internal && XINT (elt) == ')')
+		return val;
+	      return Fsignal (Qinvalid_read_syntax, Fcons (make_string (". in wrong context", 18), Qnil));
+	    }
+	  return Fsignal (Qinvalid_read_syntax, Fcons (make_string ("] in a list", 11), Qnil));
+	}
+      tem = (read_pure && flag <= 0
+	     ? pure_cons (elt, Qnil)
+	     : Fcons (elt, Qnil));
+      if (!NULL (tail))
+	XCONS (tail)->cdr = tem;
+      else
+	val = tem;
+      tail = tem;
+      if (defunflag < 0)
+	defunflag = EQ (elt, Qdefun);
+      else if (defunflag > 0)
+	read_pure = 1;
+    }
+}
+
+Lisp_Object Vobarray;
+Lisp_Object initial_obarray;
+
+Lisp_Object
+check_obarray (obarray)
+     Lisp_Object obarray;
+{
+  while (XTYPE (obarray) != Lisp_Vector || XVECTOR (obarray)->size == 0)
+    {
+      /* If Vobarray is now invalid, force it to be valid.  */
+      if (EQ (Vobarray, obarray)) Vobarray = initial_obarray;
+
+      obarray = wrong_type_argument (Qvectorp, obarray);
+    }
+  return obarray;
+}
+
+static int hash_string ();
+Lisp_Object oblookup ();
+
+Lisp_Object
+intern (str)
+     char *str;
+{
+  Lisp_Object tem;
+  int len = strlen (str);
+  Lisp_Object obarray = Vobarray;
+
+  if (XTYPE (obarray) != Lisp_Vector || XVECTOR (obarray)->size == 0)
+    obarray = check_obarray (obarray);
+  tem = oblookup (obarray, str, len);
+  if (XTYPE (tem) == Lisp_Symbol)
+    return tem;
+  return Fintern ((!NULL (Vpurify_flag)
+		   ? make_pure_string (str, len)
+		   : make_string (str, len)),
+		  obarray);
+}
+
+DEFUN ("intern", Fintern, Sintern, 1, 2, 0,
+  "Return the canonical symbol whose name is STRING.\n\
+If there is none, one is created by this function and returned.\n\
+A second optional argument specifies the obarray to use;\n\
+it defaults to the value of `obarray'.")
+  (str, obarray)
+     Lisp_Object str, obarray;
+{
+  register Lisp_Object tem, sym, *ptr;
+
+  if (NULL (obarray)) obarray = Vobarray;
+  obarray = check_obarray (obarray);
+
+  CHECK_STRING (str, 0);
+
+  tem = oblookup (obarray, XSTRING (str)->data, XSTRING (str)->size);
+  if (XTYPE (tem) != Lisp_Int)
+    return tem;
+
+  if (!NULL (Vpurify_flag))
+    str = Fpurecopy (str);
+  sym = Fmake_symbol (str);
+
+  ptr = &XVECTOR (obarray)->contents[XINT (tem)];
+  if (XTYPE (*ptr) == Lisp_Symbol)
+    XSYMBOL (sym)->next = XSYMBOL (*ptr);
+  else
+    XSYMBOL (sym)->next = 0;
+  *ptr = sym;
+  return sym;
+}
+
+DEFUN ("intern-soft", Fintern_soft, Sintern_soft, 1, 2, 0,
+  "Return the canonical symbol whose name is STRING, or nil if none exists.\n\
+A second optional argument specifies the obarray to use;\n\
+it defaults to the value of `obarray'.")
+  (str, obarray)
+     Lisp_Object str, obarray;
+{
+  register Lisp_Object tem;
+
+  if (NULL (obarray)) obarray = Vobarray;
+  obarray = check_obarray (obarray);
+
+  CHECK_STRING (str, 0);
+
+  tem = oblookup (obarray, XSTRING (str)->data, XSTRING (str)->size);
+  if (XTYPE (tem) != Lisp_Int)
+    return tem;
+  return Qnil;
+}
+
+Lisp_Object
+oblookup (obarray, ptr, size)
+     Lisp_Object obarray;
+     register char *ptr;
+     register int size;
+{
+  int hash, obsize;
+  register Lisp_Object tail;
+  Lisp_Object bucket, tem;
+
+  if (XTYPE (obarray) != Lisp_Vector ||
+      (obsize = XVECTOR (obarray)->size) == 0)
+    {
+      obarray = check_obarray (obarray);
+      obsize = XVECTOR (obarray)->size;
+    }
+  /* Combining next two lines breaks VMS C 2.3.  */
+  hash = hash_string (ptr, size);
+  hash %= obsize;
+  bucket = XVECTOR (obarray)->contents[hash];
+  if (XFASTINT (bucket) == 0)
+    ;
+  else if (XTYPE (bucket) != Lisp_Symbol)
+    error ("Bad data in guts of obarray"); /* Like CADR error message */
+  else for (tail = bucket; ; XSET (tail, Lisp_Symbol, XSYMBOL (tail)->next))
+      {
+	if (XSYMBOL (tail)->name->size == size &&
+	    !bcmp (XSYMBOL (tail)->name->data, ptr, size))
+	  return tail;
+	else if (XSYMBOL (tail)->next == 0)
+	  break;
+      }
+  XSET (tem, Lisp_Int, hash);
+  return tem;
+}
+
+static int
+hash_string (ptr, len)
+     unsigned char *ptr;
+     int len;
+{
+  register unsigned char *p = ptr;
+  register unsigned char *end = p + len;
+  register unsigned char c;
+  register int hash = 0;
+
+  while (p != end)
+    {
+      c = *p++;
+      if (c >= 0140) c -= 40;
+      hash = ((hash<<3) + (hash>>28) + c);
+    }
+  return hash & 07777777777;
+}
+
+void
+map_obarray (obarray, fn, arg)
+     Lisp_Object obarray;
+     int (*fn) ();
+     Lisp_Object arg;
+{
+  register int i;
+  register Lisp_Object tail;
+  CHECK_VECTOR (obarray, 1);
+  for (i = XVECTOR (obarray)->size - 1; i >= 0; i--)
+    {
+      tail = XVECTOR (obarray)->contents[i];
+      if (XFASTINT (tail) != 0)
+	while (1)
+	  {
+	    (*fn) (tail, arg);
+	    if (XSYMBOL (tail)->next == 0)
+	      break;
+	    XSET (tail, Lisp_Symbol, XSYMBOL (tail)->next);
+	  }
+    }
+}
+
+mapatoms_1 (sym, function)
+     Lisp_Object sym, function;
+{
+  call1 (function, sym);
+}
+
+DEFUN ("mapatoms", Fmapatoms, Smapatoms, 1, 2, 0,
+  "Call FUNCTION on every symbol in OBARRAY.\n\
+OBARRAY defaults to the value of `obarray'.")
+  (function, obarray)
+     Lisp_Object function, obarray;
+{
+  Lisp_Object tem;
+
+  if (NULL (obarray)) obarray = Vobarray;
+  obarray = check_obarray (obarray);
+
+  map_obarray (obarray, mapatoms_1, function);
+  return Qnil;
+}
+
+#define OBARRAY_SIZE 509
+
+void
+init_obarray ()
+{
+  Lisp_Object oblength;
+  int hash;
+  Lisp_Object *tem;
+
+  XFASTINT (oblength) = OBARRAY_SIZE;
+
+  Qnil = Fmake_symbol (make_pure_string ("nil", 3));
+  Vobarray = Fmake_vector (oblength, make_number (0));
+  initial_obarray = Vobarray;
+  staticpro (&initial_obarray);
+  /* Intern nil in the obarray */
+  /* These locals are to kludge around a pyramid compiler bug. */
+  hash = hash_string ("nil", 3);
+  /* Separate statement here to avoid VAXC bug. */
+  hash %= OBARRAY_SIZE;
+  tem = &XVECTOR (Vobarray)->contents[hash];
+  *tem = Qnil;
+
+  Qunbound = Fmake_symbol (make_pure_string ("unbound", 7));
+  XSYMBOL (Qnil)->function = Qunbound;
+  XSYMBOL (Qunbound)->value = Qunbound;
+  XSYMBOL (Qunbound)->function = Qunbound;
+
+  Qt = intern ("t");
+  XSYMBOL (Qnil)->value = Qnil;
+  XSYMBOL (Qnil)->plist = Qnil;
+  XSYMBOL (Qt)->value = Qt;
+
+  /* Qt is correct even if CANNOT_DUMP.  loadup.el will set to nil at end.  */
+  Vpurify_flag = Qt;
+
+  Qvariable_documentation = intern ("variable-documentation");
+
+  read_buffer_size = 100;
+  read_buffer = (char *) malloc (read_buffer_size);
+}
+
+void
+defsubr (sname)
+     struct Lisp_Subr *sname;
+{
+  Lisp_Object sym;
+  sym = intern (sname->symbol_name);
+  XSET (XSYMBOL (sym)->function, Lisp_Subr, sname);
+}
+
+#ifdef NOTDEF /* use fset in subr.el now */
+void
+defalias (sname, string)
+     struct Lisp_Subr *sname;
+     char *string;
+{
+  Lisp_Object sym;
+  sym = intern (string);
+  XSET (XSYMBOL (sym)->function, Lisp_Subr, sname);
+}
+#endif /* NOTDEF */
+
+/* New replacement for DefIntVar; it ignores the doc string argument
+   on the assumption that make-docfile will handle that.  */
+/* Define an "integer variable"; a symbol whose value is forwarded
+ to a C variable of type int.  Sample call: */
+  /* DEFVARINT ("indent-tabs-mode", &indent_tabs_mode, "Documentation");  */
+
+void
+defvar_int (namestring, address, doc)
+     char *namestring;
+     int *address;
+     char *doc;
+{
+  Lisp_Object sym;
+  sym = intern (namestring);
+  XSET (XSYMBOL (sym)->value, Lisp_Intfwd, address);
+}
+
+/* Similar but define a variable whose value is T if address contains 1,
+ NIL if address contains 0 */
+
+void
+defvar_bool (namestring, address, doc)
+     char *namestring;
+     int *address;
+     char *doc;
+{
+  Lisp_Object sym;
+  sym = intern (namestring);
+  XSET (XSYMBOL (sym)->value, Lisp_Boolfwd, address);
+}
+
+/* Similar but define a variable whose value is the Lisp Object stored at address. */
+
+void
+defvar_lisp (namestring, address, doc)
+     char *namestring;
+     Lisp_Object *address;
+     char *doc;
+{
+  Lisp_Object sym;
+  sym = intern (namestring);
+  XSET (XSYMBOL (sym)->value, Lisp_Objfwd, address);
+  staticpro (address);
+}
+
+/* Similar but don't request gc-marking of the C variable.
+   Used when that variable will be gc-marked for some other reason,
+   since marking the same slot twice can cause trouble with strings.  */
+
+void
+defvar_lisp_nopro (namestring, address, doc)
+     char *namestring;
+     Lisp_Object *address;
+     char *doc;
+{
+  Lisp_Object sym;
+  sym = intern (namestring);
+  XSET (XSYMBOL (sym)->value, Lisp_Objfwd, address);
+}
+
+#ifndef standalone
+
+/* Similar but define a variable whose value is the Lisp Object stored in
+ the current buffer.  address is the address of the slot in the buffer that is current now. */
+
+void
+defvar_per_buffer (namestring, address, doc)
+     char *namestring;
+     Lisp_Object *address;
+     char *doc;
+{
+  Lisp_Object sym;
+  int offset;
+  extern struct buffer buffer_local_symbols;
+
+  sym = intern (namestring);
+  offset = (char *)address - (char *)current_buffer;
+
+  XSET (XSYMBOL (sym)->value, Lisp_Buffer_Objfwd,
+	(Lisp_Object *) offset);
+  *(Lisp_Object *)(offset + (char *)&buffer_local_symbols) = sym;
+  if (*(int *)(offset + (char *)&buffer_local_flags) == 0)
+    /* Did a DEFVAR_PER_BUFFER without initializing the corresponding
+       slot of buffer_local_flags */
+    abort ();
+}
+
+#endif /* standalone */
+
+init_read ()
+{
+  char *normal = PATH_LOADSEARCH;
+  Lisp_Object normal_path;
+
+  /* Warn if dirs in the *standard* path don't exist.  */
+  normal_path = decode_env_path ("", normal);
+  for (; !NULL (normal_path); normal_path = XCONS (normal_path)->cdr)
+    {
+      Lisp_Object dirfile;
+      dirfile = Fcar (normal_path);
+      if (!NULL (dirfile))
+	{
+	  dirfile = Fdirectory_file_name (dirfile);
+	  if (access (XSTRING (dirfile)->data, 0) < 0)
+	    printf ("Warning: lisp library (%s) does not exist.\n",
+		    XSTRING (Fcar (normal_path))->data);
+	}
+    }
+
+  Vvalues = Qnil;
+
+  Vload_path = decode_env_path ("EMACSLOADPATH", normal);
+#ifndef CANNOT_DUMP
+  if (!NULL (Vpurify_flag))
+    Vload_path = Fcons (build_string ("../lisp"), Vload_path);
+#endif /* not CANNOT_DUMP */
+  load_in_progress = 0;
+}
+
+void
+syms_of_read ()
+{
+  defsubr (&Sread);
+  defsubr (&Sread_from_string);
+  defsubr (&Sintern);
+  defsubr (&Sintern_soft);
+  defsubr (&Sload);
+  defsubr (&Seval_current_buffer);
+  defsubr (&Seval_region);
+  defsubr (&Sread_char);
+  defsubr (&Sread_char_exclusive);
+#ifdef HAVE_X_WINDOWS
+  defsubr (&Sread_event);
+#endif /* HAVE_X_WINDOWS */
+  defsubr (&Sget_file_char);
+  defsubr (&Smapatoms);
+
+  DEFVAR_LISP ("obarray", &Vobarray,
+    "Symbol table for use by `intern' and `read'.\n\
+It is a vector whose length ought to be prime for best results.\n\
+The vector's contents don't make sense if examined from Lisp programs;\n\
+to find all the symbols in an obarray, use `mapatoms'.");
+
+  DEFVAR_LISP ("values", &Vvalues,
+    "List of values of all expressions which were read, evaluated and printed.\n\
+Order is reverse chronological.");
+
+  DEFVAR_LISP ("standard-input", &Vstandard_input,
+    "Stream for read to get input from.\n\
+See documentation of `read' for possible values.");
+  Vstandard_input = Qt;
+
+  DEFVAR_LISP ("load-path", &Vload_path,
+    "*List of directories to search for files to load.\n\
+Each element is a string (directory name) or nil (try default directory).\n\
+Initialized based on EMACSLOADPATH environment variable, if any,\n\
+otherwise to default specified in by file `paths.h' when Emacs was built.");
+
+  DEFVAR_BOOL ("load-in-progress", &load_in_progress,
+    "Non-nil iff inside of `load'.");
+
+  DEFVAR_LISP ("after-load-alist", &Vafter_load_alist,
+    "An alist of expressions to be evalled when particular files are loaded.\n\
+Each element looks like (FILENAME FORMS...).\n\
+When `load' is run and the file-name argument is FILENAME,\n\
+the FORMS in the corresponding element are executed at the end of loading.\n\n\
+FILENAME must match exactly!  Normally FILENAME is the name of a library,\n\
+with no directory specified, since that is how `load' is normally called.\n\
+An error in FORMS does not undo the load,\n\
+but does prevent execution of the rest of the FORMS.");
+  Vafter_load_alist = Qnil;
+
+  Qstandard_input = intern ("standard-input");
+  staticpro (&Qstandard_input);
+
+  Qread_char = intern ("read-char");
+  staticpro (&Qread_char);
+
+  Qget_file_char = intern ("get-file-char");
+  staticpro (&Qget_file_char);
+}