xemacs-beta: src/lread.c comparison

comparison src/lread.c @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	0293115a14e9

comparison

equal deleted inserted replaced

--1:000000000000
+:376386a54a3c
+/* Lisp parsing and input streams.
+Copyright (C) 1985-1989, 1992-1995 Free Software Foundation, Inc.
+Copyright (C) 1995 Tinker Systems.
+Copyright (C) 1996 Ben Wing.
+This file is part of XEmacs.
+XEmacs 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 2, or (at your option) any
+later version.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+/* Synched up with: Mule 2.0, FSF 19.30. */
+/* This file has been Mule-ized. */
+#include <config.h>
+#include "lisp.h"
+#ifndef standalone
+#include "buffer.h"
+#include "bytecode.h"
+#include "commands.h"
+#include "insdel.h"
+#include "lstream.h"
+#include "opaque.h"
+#include "paths.h"
+#endif
+#include "sysfile.h"
+#ifdef LISP_FLOAT_TYPE
+#define THIS_FILENAME lread
+#include "sysfloat.h"
+#endif /* LISP_FLOAT_TYPE */
+Lisp_Object Qread_char, Qstandard_input;
+Lisp_Object Qvariable_documentation;
+#define LISP_BACKQUOTES
+#ifdef LISP_BACKQUOTES
+/* FSFmacs says:
+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.
+But this is fucking typical Stallman bogosity.  Nested
+backquotes are perfectly legal and fail utterly with
+this silliness. */
+static int new_backquote_flag, old_backquote_flag;
+Lisp_Object Qbackquote, Qbacktick, Qcomma, Qcomma_at, Qcomma_dot;
+#endif
+Lisp_Object Qvariable_domain;	/* I18N3 */
+Lisp_Object Vvalues, Vstandard_input, Vafter_load_alist;
+Lisp_Object Qcurrent_load_list;
+Lisp_Object Qload, Qload_file_name;
+Lisp_Object Qlocate_file_hash_table;
+Lisp_Object Qfset;
+int puke_on_fsf_keys;
+/* non-zero if inside `load' */
+int load_in_progress;
+/* Whether Fload_internal() should check whether the .el is newer
+when loading .elc */
+int load_warn_when_source_newer;
+/* Whether Fload_internal() should check whether the .elc doesn't exist */
+int load_warn_when_source_only;
+/* Whether Fload_internal() should ignore .elc files when no suffix is given */
+int load_ignore_elc_files;
+/* Directory in which the sources were found.  */
+Lisp_Object Vsource_directory;
+/* Search path for files to be loaded. */
+Lisp_Object Vload_path;
+/* Search path for files when dumping. */
+/* Lisp_Object Vdump_load_path; */
+/* This is the user-visible association list that maps features to
+lists of defs in their load files. */
+Lisp_Object Vload_history;
+/* This is used to build the load history.  */
+Lisp_Object Vcurrent_load_list;
+/* Name of file actually being read by `load'.  */
+Lisp_Object Vload_file_name;
+/* Same as Vload_file_name but not Lisp-accessible.  This ensures that
+our #$ checks are reliable. */
+Lisp_Object Vload_file_name_internal;
+Lisp_Object Vload_file_name_internal_the_purecopy;
+/* Function to use for reading, in `load' and friends.  */
+Lisp_Object Vload_read_function;
+/* Nonzero means load should forcibly load all dynamic doc strings.  */
+/* Note that this always happens (with some special behavior) when
+purify_flag is set. */
+static int load_force_doc_strings;
+/* List of descriptors now open for Fload_internal.  */
+static Lisp_Object Vload_descriptor_list;
+/* In order to implement "load_force_doc_strings", we keep
+a list of all the compiled-function objects and such
+that we have created in the process of loading this file.
+See the rant below.
+We specbind this just like Vload_file_name, so there's no
+problems with recursive loading. */
+static Lisp_Object Vload_force_doc_string_list;
+/* A resizing-buffer stream used to temporarily hold data while reading */
+static Lisp_Object Vread_buffer_stream;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Lisp_Object Vcurrent_compiled_function_annotation;
+#endif
+/* An array describing all known built-in structure types */
+static Structure_type_dynarr *the_structure_type_dynarr;
+#if 0 /* FSFmacs defun hack */
+/* When nonzero, read conses in pure space */
+static int read_pure;
+#endif
+#if 0 /* FSFmacs bogosity */
+/* For use within read-from-string (this reader is non-reentrant!!)  */
+static int read_from_string_index;
+static int read_from_string_limit;
+#endif
+#if 0 /* More FSF implementation kludges. */
+/* In order to implement load-force-doc-string, FSF saves the
+#@-quoted string when it's seen, and goes back and retrieves
+it later.
+This approach is not only kludgy, but it in general won't work
+correctly because there's no stack of remembered #@-quoted-strings
+and those strings don't generally appear in the file in the same
+order as their #$ references. (Yes, that is amazingly stupid too.
+WHY IN THE FUCKING HELL CAN'T RMS EVER IMPLEMENT ANYTHING IN A SANE
+WAY?  It would be trivially easy to always encode the #@ string
+[which is a comment, anyway] in the middle of the (#$ . INT) cons
+reference.  That way, it would be really easy to implement
+load-force-doc-string in a non-kludgy way by just retrieving the
+string immediately, because it's delivered on a silver platter.)
+And finally, this stupid approach doesn't work under Mule, or
+under MS-DOS or Windows NT, or under VMS, or any other place
+where you either can't do an ftell() or don't get back a byte
+count.
+Oh, and one more lossage in this approach: If you attempt to
+dump any ELC files that were compiled with `byte-compile-dynamic'
+(as opposed to just `byte-compile-dynamic-docstring'), you
+get hosed.  FMH! (as the illustrious JWZ was prone to utter)
+The approach we use is clean, solves all of these problems, and is
+probably easier to implement anyway.  We just save a list of all
+the containing objects that have (#$ . INT) conses in them (this
+will only be compiled-function objects and lists), and when the
+file is finished loading, we go through and fill in all the
+doc strings at once. */
+/* This contains the last string skipped with #@.  */
+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;
+#endif
+static DOESNT_RETURN
+syntax_error (CONST char *string)
+{
+signal_error (Qinvalid_read_syntax,
+		list1 (build_translated_string (string)));
+}
+static Lisp_Object
+continuable_syntax_error (CONST char *string)
+{
+return Fsignal (Qinvalid_read_syntax,
+		  list1 (build_translated_string (string)));
+}
+/* Handle unreading and rereading of characters. */
+static Emchar
+readchar (Lisp_Object readcharfun)
+{
+/* This function can GC */
+if (BUFFERP (readcharfun))
+{
+Emchar c;
+struct buffer *b = XBUFFER (readcharfun);
+if (!BUFFER_LIVE_P (b))
+error ("Reading from killed buffer");
+if (BUF_PT (b) >= BUF_ZV (b))
+return -1;
+c = BUF_FETCH_CHAR (b, BUF_PT (b));
+BUF_SET_PT (b, BUF_PT (b) + 1);
+return c;
+}
+else if (LSTREAMP (readcharfun))
+{
+return Lstream_get_emchar (XLSTREAM (readcharfun));
+}
+else if (MARKERP (readcharfun))
+{
+Emchar c;
+Bufpos mpos = marker_position (readcharfun);
+struct buffer *inbuffer = XMARKER (readcharfun)->buffer;
+if (mpos >= BUF_ZV (inbuffer))
+	return -1;
+c = BUF_FETCH_CHAR (inbuffer, mpos);
+set_marker_position (readcharfun, mpos + 1);
+return c;
+}
+else
+{
+Lisp_Object tem = call0 (readcharfun);
+if (!CHAR_OR_CHAR_INTP (tem))
+	return -1;
+return XCHAR_OR_CHAR_INT (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 (Lisp_Object readcharfun, Emchar c)
+{
+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.  */
+;
+else if (BUFFERP (readcharfun))
+BUF_SET_PT (XBUFFER (readcharfun), BUF_PT (XBUFFER (readcharfun)) - 1);
+else if (LSTREAMP (readcharfun))
+{
+Lstream_unget_emchar (XLSTREAM (readcharfun), c);
+}
+else if (MARKERP (readcharfun))
+set_marker_position (readcharfun, marker_position (readcharfun) - 1);
+else
+call1 (readcharfun, make_char (c));
+}
+static Lisp_Object read0 (Lisp_Object readcharfun);
+static Lisp_Object read1 (Lisp_Object readcharfun);
+/* allow_dotted_lists means that something like (foo bar . baz)
+is acceptable.  If -1, means check for starting with defun
+and make structure pure. (not implemented, probably for very
+good reasons)
+*/
+/*
+If check_for_doc_references, look for (#$ . INT) doc references
+in the list and record if load_force_doc_strings is non-zero.
+(Such doc references will be destroyed during the loadup phase
+by replacing with Qzero, because Snarf-documentation will fill
+them in again.)
+WARNING: If you set this, you sure as hell better not call
+free_list() on the returned list here. */
+static Lisp_Object read_list (Lisp_Object readcharfun,
+Emchar terminator,
+int allow_dotted_lists,
+			      int check_for_doc_references);
+/* get a character from the tty */
+#ifdef standalone     /* This primitive is normally not defined */
+#define kludge DEFUN /* to keep this away from make-docfile... */
+kludge ("read-char", Fread_char, Sread_char, 0, 0, 0, "") ()
+{
+return getchar ();
+}
+#undef kludge
+#endif /* standalone */
+static void readevalloop (Lisp_Object readcharfun,
+Lisp_Object sourcefile,
+Lisp_Object (*evalfun) (Lisp_Object),
+int printflag);
+static Lisp_Object
+load_unwind (Lisp_Object stream)  /* used as unwind-protect function in load */
+{
+Lstream_close (XLSTREAM (stream));
+if (--load_in_progress < 0)
+load_in_progress = 0;
+return Qnil;
+}
+static Lisp_Object
+load_descriptor_unwind (Lisp_Object oldlist)
+{
+Vload_descriptor_list = oldlist;
+return Qnil;
+}
+static Lisp_Object
+load_file_name_internal_unwind (Lisp_Object oldval)
+{
+Vload_file_name_internal = oldval;
+return Qnil;
+}
+static Lisp_Object
+load_file_name_internal_the_purecopy_unwind (Lisp_Object oldval)
+{
+Vload_file_name_internal_the_purecopy = oldval;
+return Qnil;
+}
+static Lisp_Object
+pas_de_lache_ici (int fd, Lisp_Object victim)
+{
+Lisp_Object tem;
+EMACS_INT pos;
+if (!INTP (XCDR (victim)))
+signal_simple_error ("Bogus doc string reference", victim);
+pos = XINT (XCDR (victim));
+if (pos < 0)
+pos = -pos; /* kludge to mark a user variable */
+tem = unparesseuxify_doc_string (fd, pos, 0, Vload_file_name_internal);
+if (!STRINGP (tem))
+signal_error (Qerror, tem);
+return tem;
+}
+static Lisp_Object
+load_force_doc_string_unwind (Lisp_Object oldlist)
+{
+struct gcpro gcpro1;
+Lisp_Object list = Vload_force_doc_string_list;
+Lisp_Object tail;
+int fd = XINT (XCAR (Vload_descriptor_list));
+/* NOTE: If purify_flag is true, we're in-place modifying objects that
+may be in purespace (and if not, they will be).  Therefore, we have
+to be VERY careful to make sure that all objects that we create
+are purecopied -- objects in purespace are not marked for GC, and
+if we leave any impure objects inside of pure ones, we're really
+screwed. */
+GCPRO1 (list);
+/* restore the old value first just in case an error occurs. */
+Vload_force_doc_string_list = oldlist;
+LIST_LOOP (tail, list)
+{
+Lisp_Object john = Fcar (tail);
+if (CONSP (john))
+	{
+	  assert (CONSP (XCAR (john)));
+	  assert (!purify_flag); /* should have been handled in read_list() */
+	  XCAR (john) = pas_de_lache_ici (fd, XCAR (john));
+	}
+else
+	{
+	  Lisp_Object doc;
+	  assert (COMPILED_FUNCTIONP (john));
+	  if (CONSP (XCOMPILED_FUNCTION (john)->bytecodes))
+	    {
+	      struct gcpro ngcpro1;
+	      Lisp_Object juan = (pas_de_lache_ici
+				  (fd, XCOMPILED_FUNCTION (john)->bytecodes));
+	      Lisp_Object ivan;
+	      NGCPRO1 (juan);
+	      ivan = Fread (juan);
+	      if (!CONSP (ivan))
+		signal_simple_error ("invalid lazy-loaded byte code", ivan);
+	      /* Remember to purecopy; see above. */
+	      XCOMPILED_FUNCTION (john)->bytecodes = Fpurecopy (XCAR (ivan));
+	      XCOMPILED_FUNCTION (john)->constants = Fpurecopy (XCDR (ivan));
+	      NUNGCPRO;
+	    }
+	  doc = compiled_function_documentation (XCOMPILED_FUNCTION (john));
+	  if (CONSP (doc))
+	    {
+	      assert (!purify_flag); /* should have been handled in
+					read_compiled_function() */
+	      doc = pas_de_lache_ici (fd, doc);
+	      set_compiled_function_documentation (XCOMPILED_FUNCTION (john),
+						   doc);
+	    }
+	}
+}
+if (!NILP (list))
+free_list (list);
+UNGCPRO;
+return Qnil;
+}
+/* Close all descriptors in use for Fload_internal.
+This is used when starting a subprocess.  */
+void
+close_load_descs (void)
+{
+Lisp_Object tail;
+LIST_LOOP (tail, Vload_descriptor_list)
+close (XINT (XCAR (tail)));
+}
+#ifdef I18N3
+Lisp_Object Vfile_domain;
+Lisp_Object
+restore_file_domain (Lisp_Object val)
+{
+Vfile_domain = val;
+return Qnil;
+}
+#endif /* I18N3 */
+DEFUN ("load-internal", Fload_internal, Sload_internal, 1, 4, 0 /*
+Execute a file of Lisp code named FILE.
+First try FILE with `.elc' appended, then try with `.el',
+then try FILE unmodified.
+This function searches the directories in `load-path'.
+If optional second arg NOERROR is non-nil,
+report no error if FILE doesn't exist.
+Print messages at start and end of loading unless
+optional third arg NOMESSAGE is non-nil (ignored in -batch mode).
+If optional fourth arg NOSUFFIX is non-nil, don't try adding
+suffixes `.elc' or `.el' to the specified name FILE.
+Return t if file exists.
+*/ )
+(file, no_error, nomessage, nosuffix)
+Lisp_Object file, no_error, nomessage, nosuffix;
+{
+/* This function can GC */
+int fd = -1;
+int speccount = specpdl_depth ();
+int source_only = 0;
+Lisp_Object newer   = Qnil;
+Lisp_Object handler = Qnil;
+Lisp_Object found   = Qnil;
+struct gcpro gcpro1, gcpro2, gcpro3;
+#ifdef DEBUG_XEMACS
+int pure_usage = 0;
+#endif
+#ifdef DOS_NT
+int dosmode = O_TEXT;
+#endif /* DOS_NT */
+GCPRO3 (file, newer, found);
+CHECK_STRING (file);
+#ifdef DEBUG_XEMACS
+if (purify_flag && noninteractive)
+pure_usage = purespace_usage ();
+#endif
+/* If file name is magic, call the handler.  */
+handler = Ffind_file_name_handler (file, Qload);
+if (!NILP (handler))
+{
+RETURN_UNGCPRO (call5 (handler, Qload, file, no_error, nomessage,
+			     nosuffix));
+}
+/* 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.)  */
+file = Fsubstitute_in_file_name (file);
+/* Avoid weird lossage with null string as arg,
+since it would try to load a directory as a Lisp file.
+Unix truly sucks. */
+if (string_length (XSTRING (file)) > 0)
+{
+char *foundstr;
+int foundlen;
+fd = locate_file (Vload_path, file,
+((!NILP (nosuffix)) ? "" :
+			 load_ignore_elc_files ? ".el:" :
+			 ".elc:.el:"),
+&found,
+-1);
+if (fd < 0)
+	{
+	  if (NILP (no_error))
+	    signal_file_error ("Cannot open load file", file);
+	  else
+	    {
+	      UNGCPRO;
+	      return Qnil;
+	    }
+	}
+foundstr = (char *) alloca (string_length (XSTRING (found)) + 1);
+strcpy (foundstr, (char *) string_data (XSTRING (found)));
+foundlen = strlen (foundstr);
+/* The omniscient JWZ thinks this is worthless, but I beg to
+	 differ. --ben */
+if (load_ignore_elc_files)
+	{
+	  newer = Ffile_name_nondirectory (found);
+	}
+else if (load_warn_when_source_newer &&
+	       !memcmp (".elc", foundstr + foundlen - 4, 4))
+	{
+	  struct stat s1, s2;
+	  if (! fstat (fd, &s1))	/* can't fail, right? */
+	    {
+	      int result;
+	      /* temporarily hack the 'c' off the end of the filename */
+	      foundstr[foundlen - 1] = '\0';
+	      result = stat (foundstr, &s2);
+	      if (result >= 0 &&
+		  (unsigned) s1.st_mtime < (unsigned) s2.st_mtime)
+{
+		Lisp_Object newer_name = make_string ((Bufbyte *) foundstr,
+						      foundlen - 1);
+struct gcpro nngcpro1;
+NNGCPRO1 (newer_name);
+		newer = Ffile_name_nondirectory (newer_name);
+NNUNGCPRO;
+}
+	      /* put the 'c' back on (kludge-o-rama) */
+	      foundstr[foundlen - 1] = 'c';
+	    }
+	}
+else if (load_warn_when_source_only &&
+	       /* `found' ends in ".el" */
+	       !memcmp (".el", foundstr + foundlen - 3, 3) &&
+	       /* `file' does not end in ".el" */
+	       memcmp (".el",
+		       string_data (XSTRING (file)) +
+		       string_length (XSTRING (file)) - 3,
+		       3))
+	{
+	  source_only = 1;
+	}
+}
+#ifdef DOS_NT
+/* The file was opened as binary, because that's what we'll
+encounter most of the time.  If we're loading a .el, we need
+to reopen it in text mode. */
+if (!memcmp (".elc", foundstr + foundlen - 4, 4))
+;
+else
+fd = open (foundstr, O_RDONLY | O_TEXT);
+#endif /* not DOS_NT */
+if (load_ignore_elc_files)
+{
+if (noninteractive || NILP (nomessage))
+	message ("Loading %s...", string_data (XSTRING (newer)));
+}
+else if (!NILP (newer))
+{
+message ("Loading %s...  (file %s is newer)",
+	       string_data (XSTRING (file)),
+	       string_data (XSTRING (newer)));
+nomessage = Qnil; /* we printed the first one, so print "done" too */
+}
+else if (source_only)
+{
+message ("Loading %s...  (file %s.elc does not exist)",
+	       string_data (XSTRING (file)),
+	       string_data (XSTRING (Ffile_name_nondirectory (file))));
+nomessage = Qnil;
+}
+else if (noninteractive || NILP (nomessage))
+message ("Loading %s...", string_data (XSTRING (file)));
+{
+/* Lisp_Object's must be malloc'ed, not stack-allocated */
+Lisp_Object lispstream = Qnil;
+CONST int block_size = 8192;
+struct gcpro ngcpro1;
+NGCPRO1 (lispstream);
+lispstream = make_filedesc_input_stream (fd, 0, -1, LSTR_CLOSING);
+/* 64K is used for normal files; 8K should be OK here because Lisp
+files aren't really all that big. */
+Lstream_set_buffering (XLSTREAM (lispstream), LSTREAM_BLOCKN_BUFFERED,
+			   block_size);
+/* NOTE: Order of these is very important.  Don't rearrange them. */
+record_unwind_protect (load_unwind, lispstream);
+record_unwind_protect (load_descriptor_unwind, Vload_descriptor_list);
+record_unwind_protect (load_file_name_internal_unwind,
+			   Vload_file_name_internal);
+record_unwind_protect (load_file_name_internal_the_purecopy_unwind,
+			   Vload_file_name_internal_the_purecopy);
+record_unwind_protect (load_force_doc_string_unwind,
+			   Vload_force_doc_string_list);
+Vload_file_name_internal = found;
+Vload_file_name_internal_the_purecopy = Qnil;
+specbind (Qload_file_name, found);
+Vload_descriptor_list
+= Fcons (make_int (fd), Vload_descriptor_list);
+Vload_force_doc_string_list = Qnil;
+#ifdef I18N3
+record_unwind_protect (restore_file_domain, Vfile_domain);
+Vfile_domain = Qnil; /* set it to nil; a call to #'domain will set it. */
+#endif
+load_in_progress++;
+readevalloop (lispstream, file, Feval, 0);
+unbind_to (speccount, Qnil);
+NUNGCPRO;
+}
+{
+Lisp_Object tem;
+/* #### Disgusting kludge */
+/* Run any load-hooks for this file.  */
+tem = Fassoc (file, Vafter_load_alist);
+if (!NILP (tem))
+{
+	struct gcpro ngcpro1;
+	NGCPRO1 (tem);
+	/* Use eval so that errors give a semi-meaningful backtrace.  --Stig */
+	tem = Fcons (Qprogn, Fcdr (tem));
+	Feval (tem);
+	NUNGCPRO;
+}
+}
+#ifdef DEBUG_XEMACS
+if (noninteractive && purify_flag)
+{
+int this_pure_usage = purespace_usage () - pure_usage;
+message_append (" (%d)", this_pure_usage);
+}
+#endif
+if (noninteractive || !NILP (nomessage))
+;
+else if (!NILP (newer))
+message ("Loading %s...done  (file %s is newer)",
+	     string_data (XSTRING (file)),
+	     string_data (XSTRING (newer)));
+else
+message ("Loading %s...done", string_data (XSTRING (file)));
+UNGCPRO;
+return Qt;
+}
+#if 0 /* FSFmacs */
+/* not used */
+static int
+complete_filename_p (Lisp_Object pathname)
+{
+REGISTER unsigned char *s = string_data (XSTRING (pathname));
+return (IS_DIRECTORY_SEP (s[0])
+	  || (string_length (XSTRING (pathname)) > 2
+	      && IS_DEVICE_SEP (s[1]) && IS_DIRECTORY_SEP (s[2]))
+#ifdef ALTOS
+	  || *s == '@'
+#endif
+#ifdef VMS
+	  || strchr (s, ':')
+#endif /* VMS */
+	  );
+}
+#endif /* 0 */
+DEFUN ("locate-file", Flocate_file, Slocate_file, 2, 4, 0 /*
+Search for FILENAME through PATH-LIST, expanded by one of the optional
+SUFFIXES (string of suffixes separated by \":\"s), checking for access
+MODE (0|1|2|4 = exists|executable|writeable|readable), default readable.
+`locate-file' keeps hash tables of the directories it searches through,
+in order to speed things up.  It tries valiantly to not get confused in
+the face of a changing and unpredictable environment, but can occasionally
+get tripped up.  In this case, you will have to call
+`locate-file-clear-hashing' to get it back on track.  See that function
+for details.
+*/ )
+(filename, path_list, suffixes, mode)
+Lisp_Object filename, path_list, suffixes, mode;
+{
+/* This function can GC */
+Lisp_Object tp;
+CHECK_STRING (filename);
+if (!NILP (suffixes))
+{
+CHECK_STRING (suffixes);
+}
+if (!(NILP (mode) || (INTP (mode) && XINT (mode) >= 0)))
+mode = wrong_type_argument (Qnatnump, mode);
+locate_file (path_list, filename,
+((NILP (suffixes)) ? "" :
+		(char *) (string_data (XSTRING (suffixes)))),
+	       &tp, (NILP (mode) ? R_OK : XINT (mode)));
+return tp;
+}
+/* recalculate the hash table for the given string */
+static Lisp_Object
+locate_file_refresh_hashing (Lisp_Object str)
+{
+Lisp_Object hash =
+make_directory_hash_table ((char *) string_data (XSTRING (str)));
+Fput (str, Qlocate_file_hash_table, hash);
+return hash;
+}
+/* find the hash table for the given string, recalculating if necessary */
+static Lisp_Object
+locate_file_find_directory_hash_table (Lisp_Object str)
+{
+Lisp_Object hash = Fget (str, Qlocate_file_hash_table, Qnil);
+if (NILP (Fhashtablep (hash)))
+return locate_file_refresh_hashing (str);
+return hash;
+}
+/* look for STR in PATH, optionally adding suffixes in SUFFIX */
+static int
+locate_file_in_directory (Lisp_Object path, Lisp_Object str,
+			  CONST char *suffix, Lisp_Object *storeptr,
+			  int mode)
+{
+/* This function can GC */
+int fd;
+int fn_size = 100;
+char buf[100];
+char *fn = buf;
+int want_size;
+struct stat st;
+Lisp_Object filename = Qnil;
+struct gcpro gcpro1, gcpro2, gcpro3;
+CONST char *nsuffix;
+GCPRO3 (path, str, filename);
+filename = Fexpand_file_name (str, path);
+if (NILP (filename) || NILP (Ffile_name_absolute_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 ... */
+{
+if (NILP (filename))
+	/* NIL means current dirctory */
+	filename = current_buffer->directory;
+else
+	filename = Fexpand_file_name (filename,
+				      current_buffer->directory);
+if (NILP (Ffile_name_absolute_p (filename)))
+	{
+	  /* Give up on this path element! */
+	  UNGCPRO;
+	  return -1;
+	}
+}
+/* Calculate maximum size of any filename made from
+this path element/specified file name and any possible suffix.  */
+want_size = strlen (suffix) +
+string_length (XSTRING (filename)) + 1;
+if (fn_size < want_size)
+fn = (char *) alloca (fn_size = 100 + want_size);
+nsuffix = suffix;
+/* Loop over suffixes.  */
+while (1)
+{
+char *esuffix = (char *) strchr (nsuffix, ':');
+int lsuffix = ((esuffix) ? (esuffix - nsuffix) : strlen (nsuffix));
+/* Concatenate path element/specified name with the suffix.  */
+strncpy (fn, (char *) string_data (XSTRING (filename)),
+	       string_length (XSTRING (filename)));
+fn[string_length (XSTRING (filename))] = 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 (mode >= 0)
+	    fd = access (fn, mode);
+	  else
+#ifdef DOS_NT
+	    fd = open (fn, O_RDONLY | O_BINARY, 0);
+#else
+	    fd = open (fn, O_RDONLY, 0);
+#endif
+	  if (fd >= 0)
+	    {
+	      /* We succeeded; return this descriptor and filename.  */
+	      if (storeptr)
+		*storeptr = build_string (fn);
+	      UNGCPRO;
+	      /* If we actually opened the file, set close-on-exec flag
+		 on the new descriptor so that subprocesses can't whack
+		 at it.  */
+	      if (mode < 0)
+		(void) fcntl (fd, F_SETFD, FD_CLOEXEC);
+	      return fd;
+	    }
+	}
+/* Advance to next suffix.  */
+if (esuffix == 0)
+	break;
+nsuffix += lsuffix + 1;
+}
+UNGCPRO;
+return -1;
+}
+/* do the same as locate_file() but don't use any hash tables. */
+static int
+locate_file_without_hash (Lisp_Object path, Lisp_Object str,
+			  CONST char *suffix, Lisp_Object *storeptr,
+			  int mode)
+{
+/* This function can GC */
+int absolute;
+struct gcpro gcpro1;
+/* is this necessary? */
+GCPRO1 (path);
+absolute = !NILP (Ffile_name_absolute_p (str));
+for (; !NILP (path); path = Fcdr (path))
+{
+int val = locate_file_in_directory (Fcar (path), str, suffix,
+					  storeptr, mode);
+if (val >= 0)
+	{
+	  UNGCPRO;
+	  return val;
+	}
+if (absolute)
+	break;
+}
+UNGCPRO;
+return -1;
+}
+/* Construct a list of all files to search for. */
+static Lisp_Object
+locate_file_construct_suffixed_files (Lisp_Object str, CONST char *suffix)
+{
+int want_size;
+int fn_size = 100;
+char buf[100];
+char *fn = buf;
+CONST char *nsuffix;
+Lisp_Object suffixtab = Qnil;
+/* Calculate maximum size of any filename made from
+this path element/specified file name and any possible suffix.  */
+want_size = strlen (suffix) + string_length (XSTRING (str)) + 1;
+if (fn_size < want_size)
+fn = (char *) alloca (fn_size = 100 + want_size);
+nsuffix = suffix;
+while (1)
+{
+char *esuffix = (char *) strchr (nsuffix, ':');
+int lsuffix = ((esuffix) ? (esuffix - nsuffix) : strlen (nsuffix));
+/* Concatenate path element/specified name with the suffix.  */
+strncpy (fn, (char *) string_data (XSTRING (str)),
+	       string_length (XSTRING (str)));
+fn[string_length (XSTRING (str))] = 0;
+if (lsuffix != 0)  /* Bug happens on CCI if lsuffix is 0.  */
+	strncat (fn, nsuffix, lsuffix);
+suffixtab = Fcons (build_string (fn), suffixtab);
+/* Advance to next suffix.  */
+if (esuffix == 0)
+	break;
+nsuffix += lsuffix + 1;
+}
+return Fnreverse (suffixtab);
+}
+/* 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.
+MODE nonnegative means don't open the files,
+just look for one for which access(file,MODE) succeeds.  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.
+Called openp() in FSFmacs. */
+int
+locate_file (Lisp_Object path, Lisp_Object str, CONST char *suffix,
+	     Lisp_Object *storeptr, int mode)
+{
+/* This function can GC */
+Lisp_Object suffixtab = Qnil;
+Lisp_Object pathtail;
+int val;
+struct gcpro gcpro1, gcpro2, gcpro3;
+if (storeptr)
+*storeptr = Qnil;
+/* if this filename has directory components, it's too complicated
+to try and use the hash tables. */
+if (!NILP (Ffile_name_directory (str)))
+return locate_file_without_hash (path, str, suffix, storeptr,
+				     mode);
+/* Is it really necessary to gcpro path and str?  It shouldn't be
+unless some caller has fucked up. */
+GCPRO3 (path, str, suffixtab);
+suffixtab = locate_file_construct_suffixed_files (str, suffix);
+for (pathtail = path; !NILP (pathtail); pathtail = Fcdr (pathtail))
+{
+Lisp_Object pathel = Fcar (pathtail);
+Lisp_Object hashtab;
+Lisp_Object tail;
+int found;
+/* If this path element is relative, we have to look by hand.
+Can't set string property in a pure string. */
+if (NILP (pathel) || NILP (Ffile_name_absolute_p (pathel)) ||
+	  purified (pathel))
+	{
+	  val = locate_file_in_directory (pathel, str, suffix, storeptr,
+					  mode);
+	  if (val >= 0)
+	    {
+	      UNGCPRO;
+	      return val;
+	    }
+	  continue;
+	}
+hashtab = locate_file_find_directory_hash_table (pathel);
+/* Loop over suffixes.  */
+for (tail = suffixtab, found = 0; !NILP (tail) && !found;
+	   tail = Fcdr (tail))
+	{
+	  if (!NILP (Fgethash (Fcar (tail), hashtab, Qnil)))
+	    found = 1;
+	}
+if (found)
+	{
+	  /* This is a likely candidate.  Look by hand in this directory
+	     so we don't get thrown off if someone byte-compiles a file. */
+	  val = locate_file_in_directory (pathel, str, suffix, storeptr,
+					  mode);
+	  if (val >= 0)
+	    {
+	      UNGCPRO;
+	      return val;
+	    }
+	  /* Hmm ...  the file isn't actually there. (Or possibly it's
+	     a directory ...)  So refresh our hashing. */
+	  locate_file_refresh_hashing (pathel);
+	}
+}
+/* File is probably not there, but check the hard way just in case. */
+val = locate_file_without_hash (path, str, suffix, storeptr,
+				  mode);
+if (val >= 0)
+{
+/* Sneaky user added a file without telling us. */
+Flocate_file_clear_hashing (path);
+}
+UNGCPRO;
+return val;
+}
+DEFUN ("locate-file-clear-hashing", Flocate_file_clear_hashing,
+Slocate_file_clear_hashing, 1, 1, 0 /*
+Clear the hash records for the specified list of directories.
+`locate-file' uses a hashing scheme to speed lookup, and will correctly
+track the following environmental changes:
+-- changes of any sort to the list of directories to be searched.
+-- addition and deletion of non-shadowing files (see below) from the
+directories in the list.
+-- byte-compilation of a .el file into a .elc file.
+`locate-file' will primarily get confused if you add a file that shadows
+(i.e. has the same name as) another file further down in the directory list.
+In this case, you must call `locate-file-clear-hashing'.
+*/ )
+(path)
+Lisp_Object path;
+{
+Lisp_Object pathtail;
+for (pathtail = path; !NILP (pathtail); pathtail = Fcdr (pathtail))
+{
+Lisp_Object pathel = Fcar (pathtail);
+if (!purified (pathel))
+	Fput (pathel, Qlocate_file_hash_table, Qnil);
+}
+return Qnil;
+}
+#ifdef LOADHIST
+/* 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 (int loading, Lisp_Object source)
+{
+REGISTER Lisp_Object tail, prev, newelt;
+REGISTER Lisp_Object tem, tem2;
+int foundit;
+/* Don't bother recording anything for preloaded files.  */
+if (purify_flag)
+return;
+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;
+}
+/* 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);
+}
+#else /* !LOADHIST */
+#define build_load_history(x,y)
+#endif /* !LOADHIST */
+#if 0 /* FSFmacs defun hack */
+Lisp_Object
+unreadpure (void)	/* Used as unwind-protect function in readevalloop */
+{
+read_pure = 0;
+return Qnil;
+}
+#endif /* 0 */
+static void
+readevalloop (Lisp_Object readcharfun,
+Lisp_Object sourcename,
+Lisp_Object (*evalfun) (Lisp_Object),
+int printflag)
+{
+/* This function can GC */
+REGISTER Emchar c;
+REGISTER Lisp_Object val;
+int speccount = specpdl_depth ();
+struct gcpro gcpro1;
+struct buffer *b = 0;
+if (BUFFERP (readcharfun))
+b = XBUFFER (readcharfun);
+else if (MARKERP (readcharfun))
+b = XMARKER (readcharfun)->buffer;
+specbind (Qstandard_input, readcharfun);
+specbind (Qcurrent_load_list, Qnil);
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Vcurrent_compiled_function_annotation = Qnil;
+#endif
+GCPRO1 (sourcename);
+LOADHIST_ATTACH (sourcename);
+while (1)
+{
+QUIT;
+if (b != 0 && !BUFFER_LIVE_P (b))
+	error ("Reading from killed buffer");
+c = readchar (readcharfun);
+if (c == ';')
+	{
+/* Skip comment */
+	  while ((c = readchar (readcharfun)) != '\n' && c != -1)
+QUIT;
+	  continue;
+	}
+if (c < 0)
+break;
+/* Ignore whitespace here, so we can detect eof.  */
+if (c == ' ' || c == '\t' || c == '\n' || c == '\f' || c == '\r')
+continue;
+#if 0 /* FSFmacs defun hack */
+if (purify_flag && c == '(')
+	{
+	  int count1 = specpdl_depth ();
+	  record_unwind_protect (unreadpure, Qnil);
+	  val = read_list (readcharfun, ')', -1, 1);
+	  unbind_to (count1, Qnil);
+	}
+else
+#else /* No "defun hack" -- Emacs 19 uses read-time syntax for bytecodes */
+	{
+	  unreadchar (readcharfun, c);
+	  if (NILP (Vload_read_function))
+	    val = read0 (readcharfun);
+	  else
+	    val = call1 (Vload_read_function, readcharfun);
+	}
+#endif
+val = (*evalfun) (val);
+if (printflag)
+	{
+	  Vvalues = Fcons (val, Vvalues);
+	  if (EQ (Vstandard_output, Qt))
+	    Fprin1 (val, Qnil);
+	  else
+	    Fprint (val, Qnil);
+	}
+}
+build_load_history (LSTREAMP (readcharfun) ||
+		      /* This looks weird, but it's what's in FSFmacs */
+		      (b ? BUF_NARROWED (b) : BUF_NARROWED (current_buffer)),
+sourcename);
+UNGCPRO;
+unbind_to (speccount, Qnil);
+}
+#ifndef standalone
+DEFUN ("eval-buffer", Feval_buffer, Seval_buffer, 0, 2, "bBuffer: " /*
+Execute BUFFER as Lisp code.
+Programs can pass two arguments, BUFFER and PRINTFLAG.
+BUFFER is the buffer to evaluate (nil means use current buffer).
+PRINTFLAG controls printing of output:
+nil means discard it; anything else is stream for print.
+If there is no error, point does not move.  If there is an error,
+point remains at the end of the last character read from the buffer.
+Execute BUFFER as Lisp code.
+*/ )
+(bufname, printflag)
+Lisp_Object bufname, printflag;
+{
+/* This function can GC */
+int speccount = specpdl_depth ();
+Lisp_Object tem, buf;
+if (NILP (bufname))
+buf = Fcurrent_buffer ();
+else
+buf = Fget_buffer (bufname);
+if (NILP (buf))
+error ("No such buffer.");
+if (NILP (printflag))
+tem = Qsymbolp;             /* #### #@[]*&$#*[& SI:NULL-STREAM */
+else
+tem = printflag;
+specbind (Qstandard_output, tem);
+record_unwind_protect (save_excursion_restore, save_excursion_save ());
+BUF_SET_PT (XBUFFER (buf), BUF_BEGV (XBUFFER (buf)));
+readevalloop (buf, XBUFFER (buf)->filename, Feval,
+		!NILP (printflag));
+return unbind_to (speccount, Qnil);
+}
+#if 0
+xxDEFUN ("eval-current-buffer", Feval_current_buffer, Seval_current_buffer, 0, 1, "" /*
+Execute the current buffer as Lisp code.
+Programs can pass argument PRINTFLAG which controls printing of output:
+nil means discard it; anything else is stream for print.
+If there is no error, point does not move.  If there is an error,
+point remains at the end of the last character read from the buffer.
+*/ )
+(printflag)
+Lisp_Object printflag;
+{
+code omitted;
+}
+#endif
+DEFUN ("eval-region", Feval_region, Seval_region, 2, 3, "r" /*
+Execute the region as Lisp code.
+When called from programs, expects two arguments,
+giving starting and ending indices in the current buffer
+of the text to be executed.
+Programs can pass third argument PRINTFLAG which controls output:
+nil means discard it; anything else is stream for printing it.
+If there is no error, point does not move.  If there is an error,
+point remains at the end of the last character read from the buffer.
+Note:  Before evaling the region, this function narrows the buffer to it.
+If the code being eval'd should happen to trigger a redisplay you may
+see some text temporarily disappear because of this.
+*/ )
+(b, e, printflag)
+Lisp_Object b, e, printflag;
+{
+/* This function can GC */
+int speccount = specpdl_depth ();
+Lisp_Object tem;
+Lisp_Object cbuf = Fcurrent_buffer ();
+if (NILP (printflag))
+tem = Qsymbolp;             /* #### #@[]*&$#*[& SI:NULL-STREAM */
+else
+tem = printflag;
+specbind (Qstandard_output, tem);
+if (NILP (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, cbuf);
+Fnarrow_to_region (make_int (BUF_BEGV (current_buffer)), e, cbuf);
+readevalloop (cbuf, XBUFFER (cbuf)->filename, Feval,
+		!NILP (printflag));
+return unbind_to (speccount, Qnil);
+}
+#endif /* standalone */
+DEFUN ("read", Fread, Sread, 0, 1, 0 /*
+Read one Lisp expression as text from STREAM, return as Lisp object.
+If STREAM is nil, use the value of `standard-input' (which see).
+STREAM or the value of `standard-input' may be:
+a buffer (read from point and advance it)
+a marker (read from where it points and advance it)
+a function (call it with no arguments for each character,
+call it with a char as argument to push a char back)
+a string (takes text from string, starting at the beginning)
+t (read text line using minibuffer and use it).
+*/ )
+(stream)
+Lisp_Object stream;
+{
+if (NILP (stream))
+stream = Vstandard_input;
+if (EQ (stream, Qt))
+stream = Qread_char;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Vcurrent_compiled_function_annotation = Qnil;
+#endif
+#ifndef standalone
+if (EQ (stream, Qread_char))
+{
+Lisp_Object val = call1 (Qread_from_minibuffer,
+			       build_translated_string ("Lisp expression: "));
+return (Fcar (Fread_from_string (val, Qnil, Qnil)));
+}
+#endif
+if (STRINGP (stream))
+return Fcar (Fread_from_string (stream, Qnil, Qnil));
+return read0 (stream);
+}
+DEFUN ("read-from-string", Fread_from_string, Sread_from_string, 1, 3, 0 /*
+Read one Lisp expression which is represented as text by STRING.
+Returns a cons: (OBJECT-READ . FINAL-STRING-INDEX).
+START and END optionally delimit a substring of STRING from which to read;
+they default to 0 and (length STRING) respectively.
+*/ )
+(string, start, end)
+Lisp_Object string, start, end;
+{
+Bytecount startval, endval;
+Lisp_Object tem;
+Lisp_Object lispstream = Qnil;
+struct gcpro gcpro1;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Vcurrent_compiled_function_annotation = Qnil;
+#endif
+GCPRO1 (lispstream);
+CHECK_STRING (string);
+get_string_range_byte (string, start, end, &startval, &endval,
+			 GB_HISTORICAL_STRING_BEHAVIOR);
+lispstream = make_lisp_string_input_stream (string, startval,
+					      endval - startval);
+tem = read0 (lispstream);
+/* Yeah, it's ugly.  Gonna make something of it?
+At least our reader is reentrant ... */
+tem =
+(Fcons (tem, make_int
+	    (bytecount_to_charcount
+	     (string_data (XSTRING (string)),
+	      startval + Lstream_byte_count (XLSTREAM (lispstream))))));
+Lstream_delete (XLSTREAM (lispstream));
+UNGCPRO;
+return tem;
+}
+#ifdef LISP_BACKQUOTES
+static Lisp_Object
+backquote_unwind (Lisp_Object ptr)
+{  /* used as unwind-protect function in read0() */
+int *counter = (int *) get_opaque_ptr (ptr);
+if (--*counter < 0)
+*counter = 0;
+free_opaque_ptr (ptr);
+return Qnil;
+}
+#endif
+/* Use this for recursive reads, in contexts where internal tokens
+are not allowed.  See also read1(). */
+static Lisp_Object
+read0 (Lisp_Object readcharfun)
+{
+Lisp_Object val;
+val = read1 (readcharfun);
+if (CONSP (val) && UNBOUNDP (XCAR (val)))
+{
+Emchar c = XCHAR (XCDR (val));
+free_cons (XCONS (val));
+return Fsignal (Qinvalid_read_syntax,
+		      list1 (Fchar_to_string (make_char (c))));
+}
+return val;
+}
+static Emchar
+read_escape (Lisp_Object readcharfun)
+{
+/* This function can GC */
+Emchar c = readchar (readcharfun);
+switch (c)
+{
+case 'a': return '\007';
+case 'b': return '\b';
+case 'd': return 0177;
+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 (readcharfun);
+if (c != '-')
+	error ("Invalid escape character syntax");
+c = readchar (readcharfun);
+if (c == '\\')
+	c = read_escape (readcharfun);
+return c | 0200;
+#define FSF_KEYS
+#ifdef FSF_KEYS
+#define alt_modifier   (0x040000)
+#define super_modifier (0x080000)
+#define hyper_modifier (0x100000)
+#define shift_modifier (0x200000)
+/* fsf uses a different modifiers for meta and control.  Possibly
+byte_compiled code will still work fsfmacs, though... --Stig
+#define ctl_modifier   (0x400000)
+#define meta_modifier  (0x800000)
+*/
+#define FSF_LOSSAGE(mask)						\
+if (puke_on_fsf_keys || ((c = readchar (readcharfun)) != '-'))	\
+	error ("Invalid escape character syntax");			\
+if ((c =  readchar (readcharfun)) == '\\')			\
+	c = read_escape (readcharfun);					\
+return c | mask
+case 'S': FSF_LOSSAGE (shift_modifier);
+case 'H': FSF_LOSSAGE (hyper_modifier);
+case 'A': FSF_LOSSAGE (alt_modifier);
+case 's': FSF_LOSSAGE (super_modifier);
+#undef alt_modifier
+#undef super_modifier
+#undef hyper_modifier
+#undef shift_modifier
+#undef FSF_LOSSAGE
+#endif /* FSF_KEYS */
+case 'C':
+c = readchar (readcharfun);
+if (c != '-')
+	error ("Invalid escape character syntax");
+case '^':
+c = readchar (readcharfun);
+if (c == '\\')
+	c = read_escape (readcharfun);
+/* FSFmacs junk for non-ASCII controls.
+	 Not used here. */
+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 Emchar i = c - '0';
+	REGISTER int count = 0;
+	while (++count < 3)
+	  {
+	    if ((c = readchar (readcharfun)) >= '0' && c <= '7')
+i = (i << 3) + (c - '0');
+	    else
+	      {
+		unreadchar (readcharfun, c);
+		break;
+	      }
+	  }
+	return i;
+}
+case 'x':
+/* A hex escape, as in ANSI C.  */
+{
+	REGISTER Emchar i = 0;
+	while (1)
+	  {
+	    c = readchar (readcharfun);
+	    /* Remember, can't use isdigit(), isalpha() etc. on Emchars */
+	    if      (c >= '0' && c <= '9')  i = (i << 4) + (c - '0');
+	    else if (c >= 'a' && c <= 'f')  i = (i << 4) + (c - 'a') + 10;
+else if (c >= 'A' && c <= 'F')  i = (i << 4) + (c - 'A') + 10;
+	    else
+	      {
+		unreadchar (readcharfun, c);
+		break;
+	      }
+	  }
+	return i;
+}
+default:
+	return c;
+}
+}
+/* read symbol-constituent stuff into `Vread_buffer_stream'. */
+static Bytecount
+read_atom_0 (Lisp_Object readcharfun, Emchar firstchar, int *saw_a_backslash)
+{
+/* This function can GC */
+Emchar c = ((firstchar) >= 0 ? firstchar : readchar (readcharfun));
+Lstream_rewind (XLSTREAM (Vread_buffer_stream));
+*saw_a_backslash = 0;
+while (c > 040	/* #### - comma should be here as should backquote */
+&& !(c == '\"' || c == '\'' || c == ';'
+|| c == '(' || c == ')'
+#ifndef LISP_FLOAT_TYPE
+	      /* If we have floating-point support, then we need
+		 to allow <digits><dot><digits>.  */
+	      || c =='.'
+#endif /* not LISP_FLOAT_TYPE */
+|| c == '[' || c == ']' || c == '#'
+))
+{
+if (c == '\\')
+	{
+	  c = readchar (readcharfun);
+	  *saw_a_backslash = 1;
+	}
+Lstream_put_emchar (XLSTREAM (Vread_buffer_stream), c);
+QUIT;
+c = readchar (readcharfun);
+}
+if (c >= 0)
+unreadchar (readcharfun, c);
+/* blasted terminating 0 */
+Lstream_put_emchar (XLSTREAM (Vread_buffer_stream), 0);
+Lstream_flush (XLSTREAM (Vread_buffer_stream));
+return (Lstream_byte_count (XLSTREAM (Vread_buffer_stream)) - 1);
+}
+static Lisp_Object parse_integer (CONST Bufbyte *buf, Bytecount len, int base);
+static Lisp_Object
+read_atom (Lisp_Object readcharfun,
+Emchar firstchar,
+int uninterned_symbol)
+{
+/* This function can GC */
+int saw_a_backslash;
+Bytecount len = read_atom_0 (readcharfun, firstchar, &saw_a_backslash);
+char *read_ptr = (char *)
+resizing_buffer_stream_ptr (XLSTREAM (Vread_buffer_stream));
+/* Is it an integer? */
+if (! (saw_a_backslash || uninterned_symbol))
+{
+/* If a token had any backslashes in it, it is disqualified from
+	 being an integer or a float.  This means that 123\456 is a
+	 symbol, as is \123 (which is the way (intern "123") prints).
+	 Also, if token was preceeded by #:, it's always a symbol.
+*/
+char *p = read_ptr + len;
+char *p1 = read_ptr;
+if (*p1 == '+' || *p1 == '-') p1++;
+if (p1 != p)
+	{
+int c;
+while (p1 != p && (c = *p1) >= '0' && c <= '9')
+p1++;
+#ifdef LISP_FLOAT_TYPE
+	  /* Integers can have trailing decimal points.  */
+	  if (p1 > read_ptr && p1 < p && *p1 == '.')
+	    p1++;
+#endif
+if (p1 == p)
+{
+/* It is an integer. */
+#ifdef LISP_FLOAT_TYPE
+	      if (p1[-1] == '.')
+		p1[-1] = '\0';
+#endif
+#if 0
+	      {
+		int number = 0;
+		if (sizeof (int) == sizeof (EMACS_INT))
+		  number = atoi (read_buffer);
+		else if (sizeof (long) == sizeof (EMACS_INT))
+		  number = atol (read_buffer);
+		else
+		  abort ();
+		return (make_int (number));
+	      }
+#else
+return (parse_integer ((Bufbyte *) read_ptr, len, 10));
+#endif
+	    }
+	}
+#ifdef LISP_FLOAT_TYPE
+if (isfloat_string (read_ptr))
+	return make_float (atof (read_ptr));
+#endif
+}
+{
+Lisp_Object sym;
+if (uninterned_symbol)
+sym = (Fmake_symbol ((purify_flag)
+			   ? make_pure_pname ((Bufbyte *) read_ptr, len, 0)
+			   : make_string ((Bufbyte *) read_ptr, len)));
+else
+{
+	/* intern will purecopy pname if necessary */
+	Lisp_Object name = make_string ((Bufbyte *) read_ptr, len);
+	sym = Fintern (name, Qnil);
+}
+if (SYMBOL_IS_KEYWORD (sym))
+{
+	/* the LISP way is to put keywords in their own package, but we don't
+	   have packages, so we do something simpler.  Someday, maybe we'll
+	   have packages and then this will be reworked.  --Stig. */
+	XSYMBOL (sym)->value = sym;
+}
+return (sym);
+}
+}
+static Lisp_Object
+parse_integer (CONST Bufbyte *buf, Bytecount len, int base)
+{
+CONST Bufbyte *lim = buf + len;
+CONST Bufbyte *p = buf;
+unsigned EMACS_INT num = 0;
+int negativland = 0;
+if (*p == '-')
+{
+negativland = 1;
+p++;
+}
+else if (*p == '+')
+{
+p++;
+}
+if (p == lim)
+goto loser;
+for (; p < lim; p++)
+{
+int c = *p;
+unsigned EMACS_INT onum;
+if (isdigit (c))
+	c = c - '0';
+else if (isupper (c))
+	c = c - 'A' + 10;
+else if (islower (c))
+	c = c - 'a' + 10;
+else
+	goto loser;
+if (c < 0 || c >= base)
+	goto loser;
+onum = num;
+num = num * base + c;
+if (num < onum)
+	goto overflow;
+}
+{
+Lisp_Object result = make_int ((negativland) ? -num : num);
+if (num && ((XINT (result) < 0) != negativland))
+goto overflow;
+if (XINT (result) != ((negativland) ? -num : num))
+goto overflow;
+return (result);
+}
+overflow:
+return Fsignal (Qinvalid_read_syntax,
+list3 (build_translated_string
+			 ("Integer constant overflow in reader"),
+make_string (buf, len),
+make_int (base)));
+loser:
+return Fsignal (Qinvalid_read_syntax,
+list3 (build_translated_string
+			 ("Invalid integer constant in reader"),
+make_string (buf, len),
+make_int (base)));
+}
+static Lisp_Object
+read_integer (Lisp_Object readcharfun, int base)
+{
+/* This function can GC */
+int saw_a_backslash;
+Bytecount len = read_atom_0 (readcharfun, -1, &saw_a_backslash);
+return (parse_integer
+	  (resizing_buffer_stream_ptr (XLSTREAM (Vread_buffer_stream)),
+	   ((saw_a_backslash)
+	    ? 0 /* make parse_integer signal error */
+	    : len),
+	   base));
+}
+static Lisp_Object
+read_bit_vector (Lisp_Object readcharfun)
+{
+unsigned_char_dynarr *dyn = Dynarr_new (unsigned char);
+Emchar c;
+while (1)
+{
+c = readchar (readcharfun);
+if (c != '0' && c != '1')
+	break;
+Dynarr_add (dyn, (unsigned char) (c - '0'));
+}
+if (c >= 0)
+unreadchar (readcharfun, c);
+return make_bit_vector_from_byte_vector (Dynarr_atp (dyn, 0),
+					   Dynarr_length (dyn));
+}
+/* structures */
+struct structure_type *
+define_structure_type (Lisp_Object type,
+		       int (*validate) (Lisp_Object data,
+					Error_behavior errb),
+		       Lisp_Object (*instantiate) (Lisp_Object data))
+{
+struct structure_type st;
+st.type = type;
+st.keywords = Dynarr_new (struct structure_keyword_entry);
+st.validate = validate;
+st.instantiate = instantiate;
+Dynarr_add (the_structure_type_dynarr, st);
+return Dynarr_atp (the_structure_type_dynarr,
+		     Dynarr_length (the_structure_type_dynarr) - 1);
+}
+void
+define_structure_type_keyword (struct structure_type *st, Lisp_Object keyword,
+			       int (*validate) (Lisp_Object keyword,
+						Lisp_Object value,
+						Error_behavior errb))
+{
+struct structure_keyword_entry en;
+en.keyword = keyword;
+en.validate = validate;
+Dynarr_add (st->keywords, en);
+}
+static struct structure_type *
+recognized_structure_type (Lisp_Object type)
+{
+int i;
+for (i = 0; i < Dynarr_length (the_structure_type_dynarr); i++)
+{
+struct structure_type *st = Dynarr_atp (the_structure_type_dynarr, i);
+if (EQ (st->type, type))
+	return st;
+}
+return 0;
+}
+static Lisp_Object
+read_structure (Lisp_Object readcharfun)
+{
+Emchar c = readchar (readcharfun);
+Lisp_Object list = Qnil;
+Lisp_Object orig_list = Qnil;
+Lisp_Object already_seen = Qnil;
+struct structure_type *st;
+struct gcpro gcpro1, gcpro2;
+GCPRO2 (orig_list, already_seen);
+if (c != '(')
+RETURN_UNGCPRO (continuable_syntax_error ("#s not followed by paren"));
+list = read_list (readcharfun, ')', 0, 0);
+orig_list = list;
+{
+int len = XINT (Flength (list));
+if (len == 0)
+RETURN_UNGCPRO (continuable_syntax_error
+		      ("structure type not specified"));
+if (!(len & 1))
+RETURN_UNGCPRO
+	(continuable_syntax_error
+	 ("structures must have alternating keyword/value pairs"));
+}
+st = recognized_structure_type (XCAR (list));
+if (!st)
+{
+RETURN_UNGCPRO (Fsignal (Qinvalid_read_syntax,
+			       list2 (build_translated_string
+				      ("unrecognized structure type"),
+				      XCAR (list))));
+}
+list = Fcdr (list);
+while (!NILP (list))
+{
+Lisp_Object keyword, value;
+int i;
+struct structure_keyword_entry *en;
+keyword = Fcar (list);
+list = Fcdr (list);
+value = Fcar (list);
+list = Fcdr (list);
+if (!NILP (memq_no_quit (keyword, already_seen)))
+	{
+	  RETURN_UNGCPRO (Fsignal (Qinvalid_read_syntax,
+				   list2 (build_translated_string
+					  ("structure keyword already seen"),
+					  keyword)));
+	}
+for (i = 0; i < Dynarr_length (st->keywords); i++)
+	{
+	  en = Dynarr_atp (st->keywords, i);
+	  if (EQ (keyword, en->keyword))
+	    break;
+	}
+if (i == Dynarr_length (st->keywords))
+	RETURN_UNGCPRO (Fsignal (Qinvalid_read_syntax,
+				   list2 (build_translated_string
+					  ("unrecognized structure keyword"),
+					  keyword)));
+if (en->validate && ! (en->validate) (keyword, value, ERROR_ME))
+	RETURN_UNGCPRO
+	  (Fsignal (Qinvalid_read_syntax,
+		    list3 (build_translated_string
+			   ("invalid value for structure keyword"),
+			   keyword, value)));
+already_seen = Fcons (keyword, already_seen);
+}
+if (st->validate && ! (st->validate) (orig_list, ERROR_ME))
+RETURN_UNGCPRO
+(Fsignal (Qinvalid_read_syntax,
+		list2 (build_translated_string
+		       ("invalid structure initializer"),
+		       orig_list)));
+RETURN_UNGCPRO ((st->instantiate) (XCDR (orig_list)));
+}
+static Lisp_Object read_compiled_function (Lisp_Object readcharfun,
+					   int terminator);
+static Lisp_Object read_vector (Lisp_Object readcharfun, int terminator);
+/* Get the next character; filter out whitespace and comments */
+static Emchar
+reader_nextchar (Lisp_Object readcharfun)
+{
+/* This function can GC */
+Emchar c;
+retry:
+QUIT;
+c = readchar (readcharfun);
+if (c < 0)
+{
+if (LSTREAMP (readcharfun))
+	signal_error (Qend_of_file,
+		      list1 (build_string ("internal input stream")));
+else
+	signal_error (Qend_of_file, list1 (readcharfun));
+}
+switch (c)
+{
+default:
+{
+	/* Ignore whitespace and control characters */
+	if (c <= 040)
+	  goto retry;
+	return (c);
+}
+case ';':
+{
+/* Comment */
+while ((c = readchar (readcharfun)) >= 0 && c != '\n')
+QUIT;
+goto retry;
+}
+}
+}
+#if 0
+static Lisp_Object
+list2_pure (int pure, Lisp_Object a, Lisp_Object b)
+{
+if (pure)
+return (pure_cons (a, pure_cons (b, Qnil)));
+else
+return (list2 (a, b));
+}
+#endif
+/* Read the next Lisp object from the stream READCHARFUN and return it.
+If the return value is a cons whose car is Qunbound, then read1()
+encountered a misplaced token (e.g. a right bracket, right paren,
+or dot followed by a non-number).  To filter this stuff out,
+use read0(). */
+static Lisp_Object
+read1 (Lisp_Object readcharfun)
+{
+Emchar c;
+retry:
+c = reader_nextchar (readcharfun);
+switch (c)
+{
+case '(':
+{
+#ifdef LISP_BACKQUOTES	/* old backquote compatibility in lisp reader */
+	/* if this is disabled, then other code in eval.c must be enabled */
+	Emchar ch = reader_nextchar (readcharfun);
+	switch (ch)
+	  {
+	  case '`':
+	    {
+	      Lisp_Object tem;
+	      int speccount = specpdl_depth ();
+	      ++old_backquote_flag;
+	      record_unwind_protect (backquote_unwind,
+				     make_opaque_ptr (&old_backquote_flag));
+	      tem = read0 (readcharfun);
+	      unbind_to (speccount, Qnil);
+	      ch = reader_nextchar (readcharfun);
+	      if (ch != ')')
+		{
+		  unreadchar (readcharfun, ch);
+		  return Fsignal (Qinvalid_read_syntax,
+				  list1 (build_string
+					 ("Weird old-backquote syntax")));
+		}
+	      return list2 (Qbacktick, tem);
+	    }
+	  case ',':
+	    {
+	      if (old_backquote_flag)
+		{
+		  Lisp_Object tem, comma_type;
+		  ch = readchar (readcharfun);
+		  if (ch == '@')
+		    comma_type = Qcomma_at;
+		  else
+		    {
+		      if (ch >= 0)
+			unreadchar (readcharfun, ch);
+		      comma_type = Qcomma;
+		    }
+		  tem = read0 (readcharfun);
+		  ch = reader_nextchar (readcharfun);
+		  if (ch != ')')
+		    {
+		      unreadchar (readcharfun, ch);
+		      return Fsignal (Qinvalid_read_syntax,
+				      list1 (build_string
+					     ("Weird old-backquote syntax")));
+		    }
+		  return list2 (comma_type, tem);
+		}
+	      else
+		{
+		  unreadchar (readcharfun, ch);
+#if 0
+		  return Fsignal (Qinvalid_read_syntax,
+		       list1 (build_string ("Comma outside of backquote")));
+#else
+		  /* #### - yuck....but this is reverse compatible. */
+		  /* mostly this is required by edebug, which does it's own
+		     annotated reading.  We need to have an annotated_read
+		     function that records (with markers) the buffer
+		     positions of the elements that make up lists, then that
+		     can be used in edebug and bytecomp and the check above
+		     can go back in. --Stig */
+		  break;
+#endif
+		}
+	    }
+	  default:
+	    unreadchar (readcharfun, ch);
+	  }			/* switch(ch) */
+#endif /* old backquote crap... */
+	return read_list (readcharfun, ')', 1, 1);
+}
+case '[':
+return (read_vector (readcharfun, ']'));
+case ')':
+case ']':
+/* #### - huh? these don't do what they seem... */
+return (noseeum_cons (Qunbound, make_char (c)));
+case '.':
+{
+#ifdef LISP_FLOAT_TYPE
+	/* If a period is followed by a number, then we should read it
+	   as a floating point number.  Otherwise, it denotes a dotted
+	   pair.
+	 */
+	c = readchar (readcharfun);
+	unreadchar (readcharfun, c);
+	/* Can't use isdigit on Emchars */
+	if (c < '0' || c > '9')
+	  return (noseeum_cons (Qunbound, make_char ('.')));
+	/* Note that read_atom will loop
+	   at least once, assuring that we will not try to UNREAD
+two characters in a row.
+	   (I think this doesn't matter anymore because there should
+	   be no more danger in unreading multiple characters) */
+return (read_atom (readcharfun, '.', 0));
+#else /* ! LISP_FLOAT_TYPE */
+	return (noseeum_cons (Qunbound, make_char ('.')));
+#endif /* ! LISP_FLOAT_TYPE */
+}
+case '#':
+{
+	c = readchar (readcharfun);
+	switch (c)
+	  {
+#if 0 /* FSFmacs silly char-table syntax */
+	  case '^':
+#endif
+#if 0 /* FSFmacs silly bool-vector syntax */
+	  case '&':
+#endif
+/* "#["-- byte-code constant syntax */
+/* purecons #[...] syntax */
+	  case '[': return (read_compiled_function (readcharfun, ']'
+/*, purify_flag */ ));
+/* "#:"-- quasi-implemented gensym syntax */
+	  case ':': return (read_atom (readcharfun, -1, 1));
+/* #'x => (function x) */
+	  case '\'': return (list2 (Qfunction, read0 (readcharfun)));
+#if 0
+	    /* RMS uses this syntax for fat-strings.
+	       If we use it for vectors, then obscure bugs happen.
+	     */
+/* "#(" -- Scheme/CL vector syntax */
+	  case '(': return (read_vector (readcharfun, ')'));
+#endif
+#if 0 /* FSFmacs */
+	  case '(':
+	    {
+	      Lisp_Object tmp;
+	      struct gcpro gcpro1;
+	      /* Read the string itself.  */
+	      tmp = read1 (readcharfun);
+	      if (!STRINGP (tmp))
+		{
+		  if (CONSP (tmp) && UNBOUNDP (XCAR (tmp)))
+		    free_cons (XCONS (tmp));
+		  return (Fsignal (Qinvalid_read_syntax,
+				   list1 (build_string ("#"))));
+		}
+	      GCPRO1 (tmp);
+	      /* Read the intervals and their properties.  */
+	      while (1)
+		{
+		  Lisp_Object beg, end, plist;
+		  Emchar ch;
+		  int invalid = 0;
+		  beg = read1 (readcharfun);
+		  if (CONSP (beg) && UNBOUNDP (XCAR (beg)))
+		    {
+		      ch = XCHAR (XCDR (beg));
+		      free_cons (XCONS (beg));
+		      if (ch == ')')
+			break;
+		      else
+			invalid = 1;
+		    }
+		  if (!invalid)
+		    {
+		      end = read1 (readcharfun);
+		      if (CONSP (end) && UNBOUNDP (XCAR (end)))
+			{
+			  free_cons (XCONS (end));
+			  invalid = 1;
+			}
+		    }
+		  if (!invalid)
+		    {
+		      plist = read1 (readcharfun);
+		      if (CONSP (plist) && UNBOUNDP (XCAR (plist)))
+			{
+			  free_cons (XCONS (plist));
+			  invalid = 1;
+			}
+		    }
+		  if (invalid)
+		    RETURN_UNGCPRO
+		      (Fsignal (Qinvalid_read_syntax,
+				list2
+				(build_string ("invalid string property list"),
+				 XCDR (plist))));
+		  Fset_text_properties (beg, end, plist, tmp);
+		}
+	      UNGCPRO;
+	      return tmp;
+	    }
+#endif /* 0 */
+	  case '@':
+	    {
+	      /* #@NUMBER is used to skip NUMBER following characters.
+		 That's used in .elc files to skip over doc strings
+		 and function definitions.  */
+	      int i, nskip = 0;
+	      /* Read a decimal integer.  */
+	      while ((c = readchar (readcharfun)) >= 0
+		     && c >= '0' && c <= '9')
+nskip = (10 * nskip) + (c - '0');
+	      if (c >= 0)
+		unreadchar (readcharfun, c);
+	      /* FSF has code here that maybe caches the skipped
+		 string.  See above for why this is totally
+		 losing.  We handle this differently. */
+	      /* Skip that many characters.  */
+	      for (i = 0; i < nskip && c >= 0; i++)
+		c = readchar (readcharfun);
+	      goto retry;
+	    }
+	  case '$': return Vload_file_name_internal;
+/* bit vectors */
+	  case '*': return (read_bit_vector (readcharfun));
+/* #o10 => 8 -- octal constant syntax */
+	  case 'o': return (read_integer (readcharfun, 8));
+/* #xdead => 57005 -- hex constant syntax */
+	  case 'x': return (read_integer (readcharfun, 16));
+/* #b010 => 2 -- binary constant syntax */
+	  case 'b': return (read_integer (readcharfun, 2));
+/* #s(foobar key1 val1 key2 val2) -- structure syntax */
+	  case 's': return (read_structure (readcharfun));
+	  case '<':
+	    {
+	      unreadchar (readcharfun, c);
+	      return Fsignal (Qinvalid_read_syntax,
+		    list1 (build_string ("Cannot read unreadable object")));
+	    }
+	  default:
+	    {
+	      unreadchar (readcharfun, c);
+	      return Fsignal (Qinvalid_read_syntax,
+			      list1 (build_string ("#")));
+	    }
+	  }
+}
+/* Quote */
+case '\'': return list2 (Qquote, read0 (readcharfun));
+#ifdef LISP_BACKQUOTES
+case '`':
+{
+	Lisp_Object tem;
+	int speccount = specpdl_depth ();
+	++new_backquote_flag;
+	record_unwind_protect (backquote_unwind,
+			       make_opaque_ptr (&new_backquote_flag));
+	tem = read0 (readcharfun);
+	unbind_to (speccount, Qnil);
+	return list2 (Qbackquote, tem);
+}
+case ',':
+{
+	if (new_backquote_flag)
+	  {
+	    Lisp_Object comma_type = Qnil;
+	    int ch = readchar (readcharfun);
+	    if (ch == '@')
+	      comma_type = Qcomma_at;
+	    else if (ch == '.')
+	      comma_type = Qcomma_dot;
+	    else
+	      {
+		if (ch >= 0)
+		  unreadchar (readcharfun, ch);
+		comma_type = Qcomma;
+	      }
+	    return list2 (comma_type, read0 (readcharfun));
+	  }
+	else
+	  {
+	    /* YUCK.  99.999% backwards compatibility.  The Right
+	       Thing(tm) is to signal an error here, because it's
+	       really invalid read syntax.  Instead, this permits
+	       commas to begin symbols (unless they're inside
+	       backquotes).  If an error is signalled here in the
+	       future, then commas should be invalid read syntax
+	       outside of backquotes anywhere they're found (i.e.
+	       they must be quoted in symbols) -- Stig */
+	    return (read_atom (readcharfun, c, 0));
+	  }
+}
+#endif
+case '?':
+{
+	/* Evil GNU Emacs "character" (ie integer) syntax */
+	c = readchar (readcharfun);
+	if (c < 0)
+	  return Fsignal (Qend_of_file, list1 (readcharfun));
+	if (c == '\\')
+	  c = read_escape (readcharfun);
+	return (make_char (c));
+}
+case '\"':
+{
+	/* String */
+#ifdef I18N3
+	/* #### If the input stream is translating, then the string
+	   should be marked as translatable by setting its
+	   `string-translatable' property to t.  .el and .elc files
+	   normally are translating input streams.  See Fgettext()
+	   and print_internal(). */
+#endif
+	int cancel = 0;
+	Lstream_rewind (XLSTREAM (Vread_buffer_stream));
+	while ((c = readchar (readcharfun)) >= 0
+	       && c != '\"')
+	  {
+	    if (c == '\\')
+	      c = read_escape (readcharfun);
+	    /* c is -1 if \ newline has just been seen */
+	    if (c == -1)
+	      {
+		if (Lstream_byte_count (XLSTREAM (Vread_buffer_stream)) == 0)
+		  cancel = 1;
+	      }
+	    else
+	      Lstream_put_emchar (XLSTREAM (Vread_buffer_stream), c);
+	    QUIT;
+	  }
+	if (c < 0)
+	  return Fsignal (Qend_of_file, list1 (readcharfun));
+	/* If purifying, and string starts with \ newline,
+	   return zero instead.  This is for doc strings
+	   that we are really going to find in lib-src/DOC.nn.nn  */
+	if (purify_flag && NILP (Vdoc_file_name) && cancel)
+	  return (Qzero);
+	Lstream_flush (XLSTREAM (Vread_buffer_stream));
+#if 0 /* FSFmacs defun hack */
+	if (read_pure)
+	  return
+	    make_pure_string
+	      (resizing_buffer_stream_ptr (XLSTREAM (Vread_buffer_stream)),
+	       Lstream_byte_count (XLSTREAM (Vread_buffer_stream)));
+	else
+#endif
+	  return
+	    make_string
+	      (resizing_buffer_stream_ptr (XLSTREAM (Vread_buffer_stream)),
+	       Lstream_byte_count (XLSTREAM (Vread_buffer_stream)));
+}
+default:
+{
+	/* Ignore whitespace and control characters */
+	if (c <= 040)
+	  goto retry;
+	return (read_atom (readcharfun, c, 0));
+}
+}
+}
+#ifdef LISP_FLOAT_TYPE
+#define LEAD_INT 1
+#define DOT_CHAR 2
+#define TRAIL_INT 4
+#define E_CHAR 8
+#define EXP_INT 16
+int
+isfloat_string (CONST char *cp)
+{
+int state = 0;
+CONST Bufbyte *ucp = (CONST Bufbyte *) cp;
+if (*ucp == '+' || *ucp == '-')
+ucp++;
+if (*ucp >= '0' && *ucp <= '9')
+{
+state |= LEAD_INT;
+while (*ucp >= '0' && *ucp <= '9')
+	ucp++;
+}
+if (*ucp == '.')
+{
+state |= DOT_CHAR;
+ucp++;
+}
+if (*ucp >= '0' && *ucp <= '9')
+{
+state |= TRAIL_INT;
+while (*ucp >= '0' && *ucp <= '9')
+	ucp++;
+}
+if (*ucp == 'e' || *ucp == 'E')
+{
+state |= E_CHAR;
+ucp++;
+if ((*ucp == '+') || (*ucp == '-'))
+	ucp++;
+}
+if (*ucp >= '0' && *ucp <= '9')
+{
+state |= EXP_INT;
+while (*ucp >= '0' && *ucp <= '9')
+	ucp++;
+}
+return (((*ucp == 0) || (*ucp == ' ') || (*ucp == '\t') || (*ucp == '\n')
+	   || (*ucp == '\r') || (*ucp == '\f'))
+	  && (state == (LEAD_INT|DOT_CHAR|TRAIL_INT)
+	      || state == (DOT_CHAR|TRAIL_INT)
+	      || state == (LEAD_INT|E_CHAR|EXP_INT)
+	      || state == (LEAD_INT|DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)
+	      || state == (DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)));
+}
+#endif /* LISP_FLOAT_TYPE */
+static void *
+sequence_reader (Lisp_Object readcharfun,
+Emchar terminator,
+void *state,
+void * (*conser) (Lisp_Object readcharfun,
+void *state, Charcount len))
+{
+Charcount len;
+for (len = 0; ; len++)
+{
+Emchar ch;
+QUIT;
+ch = reader_nextchar (readcharfun);
+if (ch == terminator)
+	return (state);
+else
+	unreadchar (readcharfun, ch);
+if (ch == ']')
+	syntax_error ("\"]\" in a list");
+else if (ch == ')')
+	syntax_error ("\")\" in a vector");
+state = ((conser) (readcharfun, state, len));
+}
+}
+struct read_list_state
+{
+Lisp_Object head;
+Lisp_Object tail;
+int length;
+int allow_dotted_lists;
+Emchar terminator;
+};
+static void *
+read_list_conser (Lisp_Object readcharfun, void *state, Charcount len)
+{
+struct read_list_state *s = state;
+Lisp_Object elt;
+elt = read1 (readcharfun);
+if (CONSP (elt) && UNBOUNDP (XCAR (elt)))
+{
+Lisp_Object tem = elt;
+Emchar ch;
+elt = XCDR (elt);
+free_cons (XCONS (tem));
+tem = Qnil;
+ch = XCHAR (elt);
+if (ch != '.')
+	signal_simple_error ("BUG! Internal reader error", elt);
+else if (!s->allow_dotted_lists)
+	syntax_error ("\".\" in a vector");
+else
+	{
+	  if (!NILP (s->tail))
+	    XCDR (s->tail) = read0 (readcharfun);
+else
+	    s->head = read0 (readcharfun);
+	  elt = read1 (readcharfun);
+	  if (CONSP (elt) && UNBOUNDP (XCAR (elt)))
+	    {
+	      ch = XCHAR (XCDR (elt));
+	      free_cons (XCONS (elt));
+	      if (ch == s->terminator)
+		{
+		  unreadchar (readcharfun, s->terminator);
+		  goto done;
+		}
+	    }
+	  syntax_error (". in wrong context");
+	}
+}
+#if 0 /* FSFmacs defun hack, or something ... */
+if (NILP (tail) && defun_hack && EQ (elt, Qdefun) && !read_pure)
+{
+record_unwind_protect (unreadpure, Qzero);
+read_pure = 1;
+}
+#endif
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+if (s->length == 1 && s->allow_dotted_lists && EQ (XCAR (s->head), Qfset))
+{
+if (CONSP (elt) && EQ (XCAR (elt), Qquote) && CONSP (XCDR (elt)))
+	Vcurrent_compiled_function_annotation = XCAR (XCDR (elt));
+else
+	Vcurrent_compiled_function_annotation = elt;
+}
+#endif
+elt = Fcons (elt, Qnil);
+if (!NILP (s->tail))
+XCDR (s->tail) = elt;
+else
+s->head = elt;
+s->tail = elt;
+done:
+s->length++;
+return (s);
+}
+#if 0 /* FSFmacs defun hack */
+/* -1 for allow_dotted_lists means allow_dotted_lists and check
+for starting with defun and make structure pure. */
+#endif
+static Lisp_Object
+read_list (Lisp_Object readcharfun,
+Emchar terminator,
+int allow_dotted_lists,
+	   int check_for_doc_references)
+{
+struct read_list_state s;
+struct gcpro gcpro1, gcpro2;
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Lisp_Object old_compiled_function_annotation =
+Vcurrent_compiled_function_annotation;
+#endif
+s.head = Qnil;
+s.tail = Qnil;
+s.length = 0;
+s.allow_dotted_lists = allow_dotted_lists;
+s.terminator = terminator;
+GCPRO2 (s.head, s.tail);
+(void) sequence_reader (readcharfun,
+terminator,
+&s,
+read_list_conser);
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Vcurrent_compiled_function_annotation = old_compiled_function_annotation;
+#endif
+if ((purify_flag || load_force_doc_strings) && check_for_doc_references)
+{
+/* check now for any doc string references and record them
+	 for later. */
+Lisp_Object tail;
+/* We might be dealing with an imperfect list so don't
+	 use LIST_LOOP */
+for (tail = s.head; CONSP (tail); tail = XCDR (tail))
+	{
+	  Lisp_Object holding_cons = Qnil;
+	  {
+	    Lisp_Object elem = XCAR (tail);
+	    /* elem might be (#$ . INT) ... */
+	    if (CONSP (elem) && EQ (XCAR (elem), Vload_file_name_internal))
+	      holding_cons = tail;
+	    /* or it might be (quote (#$ . INT)) i.e.
+	       (quote . ((#$ . INT) . nil)) in the case of
+	       `autoload' (autoload evaluates its arguments, while
+	       `defvar', `defun', etc. don't). */
+	    if (CONSP (elem) && EQ (XCAR (elem), Qquote)
+		&& CONSP (XCDR (elem)))
+	      {
+		elem = XCAR (XCDR (elem));
+		if (CONSP (elem) && EQ (XCAR (elem), Vload_file_name_internal))
+		  holding_cons = XCDR (XCAR (tail));
+	      }
+	  }
+	  if (CONSP (holding_cons))
+	    {
+	      if (purify_flag)
+		{
+		  if (NILP (Vdoc_file_name))
+		    /* We have not yet called Snarf-documentation, so
+		       assume this file is described in the DOC-MM.NN
+		       file and Snarf-documentation will fill in the
+		       right value later.  For now, replace the whole
+		       list with 0.  */
+		    XCAR (holding_cons) = Qzero;
+		  else
+		    /* We have already called Snarf-documentation, so
+		       make a relative file name for this file, so it
+		       can be found properly in the installed Lisp
+		       directory.  We don't use Fexpand_file_name
+		       because that would make the directory absolute
+		       now.  */
+		    XCAR (XCAR (holding_cons)) =
+		      concat2 (build_string ("../lisp/"),
+			       Ffile_name_nondirectory
+			       (Vload_file_name_internal));
+		}
+	      else
+		/* Not pure.  Just add to Vload_force_doc_string_list,
+		   and the string will be filled in properly in
+		   load_force_doc_string_unwind(). */
+		Vload_force_doc_string_list =
+		  /* We pass the cons that holds the (#$ . INT) so we
+		     can modify it in-place. */
+		  Fcons (holding_cons, Vload_force_doc_string_list);
+	    }
+	}
+}
+UNGCPRO;
+return (s.head);
+}
+static Lisp_Object
+read_vector (Lisp_Object readcharfun,
+Emchar terminator)
+{
+Lisp_Object tem;
+Lisp_Object *p;
+int len;
+int i;
+struct read_list_state s;
+struct gcpro gcpro1, gcpro2;
+s.head = Qnil;
+s.tail = Qnil;
+s.length = 0;
+s.allow_dotted_lists = 0;
+GCPRO2 (s.head, s.tail);
+(void) sequence_reader (readcharfun,
+terminator,
+&s,
+read_list_conser);
+UNGCPRO;
+tem = s.head;
+len = XINT (Flength (tem));
+#if 0 /* FSFmacs defun hack */
+if (read_pure)
+s.head = make_pure_vector (len, Qnil);
+else
+#endif
+s.head = make_vector (len, Qnil);
+for (i = 0, p = &(vector_data (XVECTOR (s.head))[0]);
+i < len;
+i++, p++)
+{
+struct Lisp_Cons *otem = XCONS (tem);
+#if 0 /* FSFmacs defun hack */
+if (read_pure)
+tem = Fpurecopy (Fcar (tem));
+else
+#endif
+tem = Fcar (tem);
+*p = tem;
+tem = otem->cdr;
+free_cons (otem);
+}
+return (s.head);
+}
+static Lisp_Object
+read_compiled_function (Lisp_Object readcharfun, Emchar terminator)
+{
+/* Accept compiled functions at read-time so that we don't
+have to build them at load-time. */
+Lisp_Object stuff;
+Lisp_Object make_byte_code_args[COMPILED_DOMAIN + 1];
+struct gcpro gcpro1;
+int len;
+int iii;
+int saw_a_doc_ref = 0;
+/* Note: we tell read_list not to search for doc references
+because we need to handle the "doc reference" for the
+instructions and constants differently. */
+stuff = read_list (readcharfun, terminator, 0, 0);
+len = XINT (Flength (stuff));
+if (len < COMPILED_STACK_DEPTH + 1 || len > COMPILED_DOMAIN + 1)
+return
+continuable_syntax_error ("#[...] used with wrong number of elements");
+for (iii = 0; CONSP (stuff); iii++)
+{
+struct Lisp_Cons *victim = XCONS (stuff);
+make_byte_code_args[iii] = Fcar (stuff);
+if ((purify_flag || load_force_doc_strings)
+	   && CONSP (make_byte_code_args[iii])
+	  && EQ (XCAR (make_byte_code_args[iii]), Vload_file_name_internal))
+	{
+	  if (purify_flag && iii == COMPILED_DOC_STRING)
+	    {
+	      /* same as in read_list(). */
+	      if (NILP (Vdoc_file_name))
+		make_byte_code_args[iii] = Qzero;
+	      else
+		XCAR (make_byte_code_args[iii]) =
+		  concat2 (build_string ("../lisp/"),
+			   Ffile_name_nondirectory
+			   (Vload_file_name_internal));
+	    }
+	  else
+	    saw_a_doc_ref = 1;
+	}
+stuff = Fcdr (stuff);
+free_cons (victim);
+}
+GCPRO1 (make_byte_code_args[0]);
+gcpro1.nvars = len;
+/* make-byte-code looks at purify_flag, which should have the same
+*  value as our "read-pure" argument */
+stuff = Fmake_byte_code (len, make_byte_code_args);
+if (saw_a_doc_ref)
+Vload_force_doc_string_list = Fcons (stuff, Vload_force_doc_string_list);
+UNGCPRO;
+return stuff;
+}
+void
+init_lread (void)
+{
+#ifdef PATH_LOADSEARCH
+CONST char *normal = PATH_LOADSEARCH;
+/* Don't print this warning.  If the hardcoded paths don't exist, then
+startup.el will try and deduce one.  If it fails, it knows how to
+handle things. */
+#if 0
+#ifndef WINDOWSNT
+/* When Emacs is invoked over network shares on NT, PATH_LOADSEARCH is
+almost never correct, thereby causing a warning to be printed out that
+confuses users.  Since PATH_LOADSEARCH is always overriden by the
+EMACSLOADPATH environment variable below, disable the warning on NT.  */
+/* Warn if dirs in the *standard* path don't exist.  */
+if (!turn_off_warning)
+{
+Lisp_Object normal_path = decode_env_path (0, normal);
+for (; !NILP (normal_path); normal_path = XCDR (normal_path))
+	{
+	  Lisp_Object dirfile;
+	  dirfile = Fcar (normal_path);
+	  if (!NILP (dirfile))
+	    {
+	      dirfile = Fdirectory_file_name (dirfile);
+	      if (access ((char *) string_data (XSTRING (dirfile)), 0) < 0)
+		stdout_out ("Warning: lisp library (%s) does not exist.\n",
+			    string_data (XSTRING (Fcar (normal_path))));
+	    }
+	}
+}
+#endif /* WINDOWSNT */
+#endif /* 0 */
+#else /* !PATH_LOADSEARCH */
+CONST char *normal = 0;
+#endif /* !PATH_LOADSEARCH */
+Vvalues = Qnil;
+/* further frobbed by startup.el if nil. */
+Vload_path = decode_env_path ("EMACSLOADPATH", normal);
+/*  Vdump_load_path = Qnil; */
+#ifndef CANNOT_DUMP
+if (purify_flag && NILP (Vload_path))
+{
+/* loadup.el will frob this some more. */
+/* #### unix-specific */
+Vload_path = Fcons (build_string ("../lisp/prim"), Vload_path);
+}
+#endif /* not CANNOT_DUMP */
+load_in_progress = 0;
+Vload_descriptor_list = Qnil;
+Vread_buffer_stream = make_resizing_buffer_output_stream ();
+Vload_force_doc_string_list = Qnil;
+}
+void
+syms_of_lread (void)
+{
+defsubr (&Sread);
+defsubr (&Sread_from_string);
+defsubr (&Sload_internal);
+defsubr (&Slocate_file);
+defsubr (&Slocate_file_clear_hashing);
+defsubr (&Seval_buffer);
+defsubr (&Seval_region);
+#ifdef standalone
+defsubr (&Sread_char);
+#endif
+defsymbol (&Qstandard_input, "standard-input");
+defsymbol (&Qread_char, "read-char");
+defsymbol (&Qcurrent_load_list, "current-load-list");
+defsymbol (&Qload, "load");
+defsymbol (&Qload_file_name, "load-file-name");
+defsymbol (&Qlocate_file_hash_table, "locate-file-hash-table");
+defsymbol (&Qfset, "fset");
+#ifdef LISP_BACKQUOTES
+defsymbol (&Qbackquote, "backquote");
+defsymbol (&Qbacktick, "`");
+defsymbol (&Qcomma, ",");
+defsymbol (&Qcomma_at, ",@");
+defsymbol (&Qcomma_dot, ",.");
+#endif
+}
+void
+structure_type_create (void)
+{
+the_structure_type_dynarr = Dynarr_new (struct structure_type);
+}
+void
+vars_of_lread (void)
+{
+DEFVAR_LISP ("values", &Vvalues /*
+List of values of all expressions which were read, evaluated and printed.
+Order is reverse chronological.
+*/ );
+DEFVAR_LISP ("standard-input", &Vstandard_input /*
+Stream for read to get input from.
+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.
+Each element is a string (directory name) or nil (try default directory).
+Note that the elements of this list *may not* begin with \"~\", so you must
+call `expand-file-name' on them before adding them to this list.
+Initialized based on EMACSLOADPATH environment variable, if any,
+otherwise to default specified in by file `paths.h' when XEmacs was built.
+If there were no paths specified in `paths.h', then XEmacs chooses a default
+value for this variable by looking around in the file-system near the
+directory in which the XEmacs executable resides.
+*/ );
+/*  xxxDEFVAR_LISP ("dump-load-path", &Vdump_load_path,
+"*Location of lisp files to be used when dumping ONLY."); */
+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.
+Each element looks like (FILENAME FORMS...).
+When `load' is run and the file-name argument is FILENAME,
+the FORMS in the corresponding element are executed at the end of loading.
+FILENAME must match exactly!  Normally FILENAME is the name of a library,
+with no directory specified, since that is how `load' is normally called.
+An error in FORMS does not undo the load,
+but does prevent execution of the rest of the FORMS.
+*/ );
+Vafter_load_alist = Qnil;
+DEFVAR_BOOL ("load-warn-when-source-newer", &load_warn_when_source_newer /*
+*Whether `load' should check whether the source is newer than the binary.
+If this variable is true, then when a `.elc' file is being loaded and the
+corresponding `.el' is newer, a warning message will be printed.
+*/ );
+load_warn_when_source_newer = 0;
+DEFVAR_BOOL ("load-warn-when-source-only", &load_warn_when_source_only /*
+*Whether `load' should warn when loading a `.el' file instead of an `.elc'.
+If this variable is true, then when `load' is called with a filename without
+an extension, and the `.elc' version doesn't exist but the `.el' version does,
+then a message will be printed.  If an explicit extension is passed to `load',
+no warning will be printed.
+*/ );
+load_warn_when_source_only = 0;
+DEFVAR_BOOL ("load-ignore-elc-files", &load_ignore_elc_files /*
+*Whether `load' should ignore `.elc' files when a suffix is not given.
+This is normally used only to bootstrap the `.elc' files when building XEmacs.
+*/ );
+load_ignore_elc_files = 0;
+#ifdef LOADHIST
+DEFVAR_LISP ("load-history", &Vload_history /*
+Alist mapping source file names to symbols and features.
+Each alist element is a list that starts with a file name,
+except for one element (optional) that starts with nil and describes
+definitions evaluated from buffers not visiting files.
+The remaining elements of each list are symbols defined as functions
+or variables, and cons cells `(provide . FEATURE)' and `(require . FEATURE)'.
+*/ );
+Vload_history = Qnil;
+DEFVAR_LISP ("current-load-list", &Vcurrent_load_list /*
+Used for internal purposes by `load'.
+*/ );
+Vcurrent_load_list = Qnil;
+#endif
+DEFVAR_LISP ("load-file-name", &Vload_file_name /*
+Full name of file being loaded by `load'.
+*/ );
+Vload_file_name = Qnil;
+DEFVAR_LISP ("load-read-function", &Vload_read_function /*
+"Function used by `load' and `eval-region' for reading expressions.
+The default is nil, which means use the function `read'.
+*/ );
+Vload_read_function = Qnil;
+DEFVAR_BOOL ("load-force-doc-strings", &load_force_doc_strings /*
+Non-nil means `load' should force-load all dynamic doc strings.
+This is useful when the file being loaded is a temporary copy.
+*/ );
+load_force_doc_strings = 0;
+DEFVAR_LISP ("source-directory", &Vsource_directory /*
+Directory in which XEmacs sources were found when XEmacs was built.
+You cannot count on them to still be there!
+*/ );
+Vsource_directory = Qnil;
+DEFVAR_BOOL ("fail-on-bucky-bit-character-escapes", &puke_on_fsf_keys /*
+Whether `read' should signal an error when it encounters unsupported
+character escape syntaxes or just read them incorrectly.
+*/ );
+puke_on_fsf_keys = 0;
+/* This must be initialized in init_lread otherwise it may start out
+with values saved when the image is dumped. */
+staticpro (&Vload_descriptor_list);
+/* This gets initialized in init_lread because all streams get closed
+when dumping occurs */
+staticpro (&Vread_buffer_stream);
+/* Initialized in init_lread. */
+staticpro (&Vload_force_doc_string_list);
+Vload_file_name_internal = Qnil;
+staticpro (&Vload_file_name_internal);
+Vload_file_name_internal_the_purecopy = Qnil;
+staticpro (&Vload_file_name_internal_the_purecopy);
+#ifdef COMPILED_FUNCTION_ANNOTATION_HACK
+Vcurrent_compiled_function_annotation = Qnil;
+staticpro (&Vcurrent_compiled_function_annotation);
+#endif
+/* So that early-early stuff will work */
+Ffset (Qload, intern ("load-internal"));
+#ifdef LISP_BACKQUOTES
+old_backquote_flag = new_backquote_flag = 0;
+#endif
+#ifdef I18N3
+Vfile_domain = Qnil;
+#endif
+}

Mercurial > hg > xemacs-beta

comparison src/lread.c @ 0:376386a54a3c r19-14