xemacs-beta: src/fns.c comparison

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

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	ac2d302a0011

comparison

equal deleted inserted replaced

--1:000000000000
+:376386a54a3c
+/* Random utility Lisp functions.
+Copyright (C) 1985, 86, 87, 93, 94, 95 Free Software Foundation, Inc.
+Copyright (C) 1995, 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. */
+/* Note: FSF 19.30 has bool vectors.  We have bit vectors. */
+/* Hacked on for Mule by Ben Wing, December 1994, January 1995. */
+#include <config.h>
+/* Note on some machines this defines `vector' as a typedef,
+so make sure we don't use that name in this file.  */
+#undef vector
+#define vector *****
+#include "lisp.h"
+#include "buffer.h"
+#include "bytecode.h"
+#include "commands.h"
+#include "device.h"
+#include "events.h"
+#include "extents.h"
+#include "frame.h"
+#include "systime.h"
+Lisp_Object Qstring_lessp;
+Lisp_Object Qidentity;
+static Lisp_Object mark_bit_vector (Lisp_Object, void (*) (Lisp_Object));
+static void print_bit_vector (Lisp_Object, Lisp_Object, int);
+static int bit_vector_equal (Lisp_Object o1, Lisp_Object o2, int depth);
+static unsigned long bit_vector_hash (Lisp_Object obj, int depth);
+DEFINE_BASIC_LRECORD_IMPLEMENTATION ("bit-vector", bit_vector,
+				     mark_bit_vector, print_bit_vector, 0,
+				     bit_vector_equal, bit_vector_hash,
+				     struct Lisp_Bit_Vector);
+static Lisp_Object
+mark_bit_vector (Lisp_Object obj, void (*markobj) (Lisp_Object))
+{
+return (Qnil);
+}
+static void
+print_bit_vector (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
+{
+int i;
+struct Lisp_Bit_Vector *v = XBIT_VECTOR (obj);
+int len = bit_vector_length (v);
+int last = len;
+if (INTP (Vprint_length))
+last = min (len, XINT (Vprint_length));
+write_c_string ("#*", printcharfun);
+for (i = 0; i < last; i++)
+{
+if (bit_vector_bit (v, i))
+	write_c_string ("1", printcharfun);
+else
+	write_c_string ("0", printcharfun);
+}
+if (last != len)
+write_c_string ("...", printcharfun);
+}
+static int
+bit_vector_equal (Lisp_Object o1, Lisp_Object o2, int depth)
+{
+struct Lisp_Bit_Vector *v1 = XBIT_VECTOR (o1);
+struct Lisp_Bit_Vector *v2 = XBIT_VECTOR (o2);
+if (bit_vector_length (v1) != bit_vector_length (v2))
+return 0;
+return !memcmp (v1->bits, v2->bits,
+		  BIT_VECTOR_LONG_STORAGE (bit_vector_length (v1)) *
+		  sizeof (long));
+}
+static unsigned long
+bit_vector_hash (Lisp_Object obj, int depth)
+{
+struct Lisp_Bit_Vector *v = XBIT_VECTOR (obj);
+return HASH2 (bit_vector_length (v),
+		memory_hash (v->bits,
+			     BIT_VECTOR_LONG_STORAGE (bit_vector_length (v)) *
+			     sizeof (long)));
+}
+DEFUN ("identity", Fidentity, Sidentity, 1, 1, 0 /*
+Return the argument unchanged.
+*/ )
+(arg)
+Lisp_Object arg;
+{
+return arg;
+}
+extern long get_random (void);
+extern void seed_random (long arg);
+DEFUN ("random", Frandom, Srandom, 0, 1, 0 /*
+Return a pseudo-random number.
+All integers representable in Lisp are equally likely.\n\
+On most systems, this is 28 bits' worth.\n\
+With positive integer argument N, return random number in interval [0,N).\n\
+With argument t, set the random number seed from the current time and pid.
+*/ )
+(limit)
+Lisp_Object limit;
+{
+EMACS_INT val;
+Lisp_Object lispy_val;
+unsigned long denominator;
+if (EQ (limit, Qt))
+seed_random (getpid () + time (NULL));
+if (NATNUMP (limit) && !ZEROP (limit))
+{
+/* Try to take our random number from the higher bits of VAL,
+	 not the lower, since (says Gentzel) the low bits of `random'
+	 are less random than the higher ones.  We do this by using the
+	 quotient rather than the remainder.  At the high end of the RNG
+	 it's possible to get a quotient larger than limit; discarding
+	 these values eliminates the bias that would otherwise appear
+	 when using a large limit.  */
+denominator = ((unsigned long)1 << VALBITS) / XINT (limit);
+do
+	val = get_random () / denominator;
+while (val >= XINT (limit));
+}
+else
+val = get_random ();
+XSETINT (lispy_val, val);
+return lispy_val;
+}
+/* Random data-structure functions */
+#ifdef LOSING_BYTECODE
+/* #### Delete this shit */
+/* Charcount is a misnomer here as we might be dealing with the
+length of a vector or list, but emphasizes that we're not dealing
+with Bytecounts in strings */
+static Charcount
+length_with_bytecode_hack (Lisp_Object seq)
+{
+if (!COMPILED_FUNCTIONP (seq))
+return (XINT (Flength (seq)));
+else
+{
+struct Lisp_Compiled_Function *b = XCOMPILED_FUNCTION (seq);
+int intp = b->flags.interactivep;
+int domainp = b->flags.domainp;
+if (intp)
+	return (COMPILED_INTERACTIVE + 1);
+else if (domainp)
+	return (COMPILED_DOMAIN + 1);
+else
+	return (COMPILED_DOC_STRING + 1);
+}
+}
+#endif /* LOSING_BYTECODE */
+void
+check_losing_bytecode (CONST char *function, Lisp_Object seq)
+{
+if (COMPILED_FUNCTIONP (seq))
+error_with_frob
+(seq,
+"As of 19.14, `%s' no longer works with compiled-function objects",
+function);
+}
+DEFUN ("length", Flength, Slength, 1, 1, 0 /*
+Return the length of vector, bit vector, list or string SEQUENCE.
+*/ )
+(obj)
+Lisp_Object obj;
+{
+Lisp_Object tail;
+int i;
+retry:
+if (STRINGP (obj))
+return (make_int (string_char_length (XSTRING (obj))));
+else if (VECTORP (obj))
+return (make_int (vector_length (XVECTOR (obj))));
+else if (BIT_VECTORP (obj))
+return (make_int (bit_vector_length (XBIT_VECTOR (obj))));
+else if (CONSP (obj))
+{
+for (i = 0, tail = obj; !NILP (tail); i++)
+	{
+	  QUIT;
+	  tail = Fcdr (tail);
+	}
+return (make_int (i));
+}
+else if (NILP (obj))
+{
+return (Qzero);
+}
+else
+{
+check_losing_bytecode ("length", obj);
+obj = wrong_type_argument (Qsequencep, obj);
+goto retry;
+}
+}
+/* This does not check for quits.  That is safe
+since it must terminate.  */
+DEFUN ("safe-length", Fsafe_length, Ssafe_length, 1, 1, 0 /*
+Return the length of a list, but avoid error or infinite loop.
+This function never gets an error.  If LIST is not really a list,
+it returns 0.  If LIST is circular, it returns a finite value
+which is at least the number of distinct elements.
+*/ )
+(list)
+Lisp_Object list;
+{
+Lisp_Object tail, halftail, length;
+int len = 0;
+/* halftail is used to detect circular lists.  */
+halftail = list;
+for (tail = list; CONSP (tail); tail = XCDR (tail))
+{
+if (EQ (tail, halftail) && len != 0)
+	break;
+len++;
+if ((len & 1) == 0)
+	halftail = XCDR (halftail);
+}
+XSETINT (length, len);
+return length;
+}
+/*** string functions. ***/
+DEFUN ("string-equal", Fstring_equal, Sstring_equal, 2, 2, 0 /*
+T if two strings have identical contents.
+Case is significant.  Text properties are ignored.
+(Under XEmacs, `equal' also ignores text properties and extents in
+strings, but this is not the case under FSF Emacs.)
+Symbols are also allowed; their print names are used instead.
+*/ )
+(s1, s2)
+Lisp_Object s1, s2;
+{
+int len;
+if (SYMBOLP (s1))
+XSETSTRING (s1, XSYMBOL (s1)->name);
+if (SYMBOLP (s2))
+XSETSTRING (s2, XSYMBOL (s2)->name);
+CHECK_STRING (s1);
+CHECK_STRING (s2);
+len = string_length (XSTRING (s1));
+if (len != string_length (XSTRING (s2)) ||
+memcmp (string_data (XSTRING (s1)), string_data (XSTRING (s2)), len))
+return Qnil;
+return Qt;
+}
+DEFUN ("string-lessp", Fstring_lessp, Sstring_lessp, 2, 2, 0 /*
+T if first arg string is less than second in lexicographic order.
+If I18N2 support was compiled in, ordering is determined by the locale.
+Case is significant for the default C locale.
+Symbols are also allowed; their print names are used instead.
+*/ )
+(s1, s2)
+Lisp_Object s1, s2;
+{
+struct Lisp_String *p1, *p2;
+Charcount end, len2;
+if (SYMBOLP (s1))
+XSETSTRING (s1, XSYMBOL (s1)->name);
+if (SYMBOLP (s2))
+XSETSTRING (s2, XSYMBOL (s2)->name);
+CHECK_STRING (s1);
+CHECK_STRING (s2);
+p1 = XSTRING (s1);
+p2 = XSTRING (s2);
+end = string_char_length (XSTRING (s1));
+len2 = string_char_length (XSTRING (s2));
+if (end > len2)
+end = len2;
+{
+int i;
+#ifdef I18N2
+Bytecount bcend = charcount_to_bytecount (string_data (p1), end);
+/* Compare strings using collation order of locale. */
+/* Need to be tricky to handle embedded nulls. */
+for (i = 0; i < bcend; i += strlen((char *) string_data (p1) + i) + 1)
+{
+	int val = strcoll ((char *) string_data (p1) + i,
+			   (char *) string_data (p2) + i);
+	if (val < 0)
+	  return Qt;
+	if (val > 0)
+	  return Qnil;
+}
+#else /* not I18N2 */
+for (i = 0; i < end; i++)
+{
+if (string_char (p1, i) != string_char (p2, i))
+return string_char (p1, i) < string_char (p2, i) ? Qt : Qnil;
+}
+#endif /* not I18N2 */
+/* Can't do i < len2 because then comparison between "foo" and "foo^@"
+won't work right in I18N2 case */
+return ((end < len2) ? Qt : Qnil);
+}
+}
+DEFUN ("string-modified-tick", Fstring_modified_tick, Sstring_modified_tick,
+1, 1, 0 /*
+Return STRING's tick counter, incremented for each change to the string.
+Each string has a tick counter which is incremented each time the contents
+of the string are changed (e.g. with `aset').  It wraps around occasionally.
+*/ )
+(string)
+Lisp_Object string;
+{
+struct Lisp_String *s;
+CHECK_STRING (string);
+s = XSTRING (string);
+if (CONSP (s->plist) && INTP (XCAR (s->plist)))
+return XCAR (s->plist);
+else
+return Qzero;
+}
+void
+bump_string_modiff (Lisp_Object str)
+{
+struct Lisp_String *s = XSTRING (str);
+Lisp_Object *ptr = &s->plist;
+#ifdef I18N3
+/* #### remove the `string-translatable' property from the string,
+if there is one. */
+#endif
+/* skip over extent info if it's there */
+if (CONSP (*ptr) && EXTENT_INFOP (XCAR (*ptr)))
+ptr = &XCDR (*ptr);
+if (CONSP (*ptr) && INTP (XCAR (*ptr)))
+XSETINT (XCAR (*ptr), 1+XINT (XCAR (*ptr)));
+else
+*ptr = Fcons (make_int (1), *ptr);
+}
+enum  concat_target_type { c_cons, c_string, c_vector, c_bit_vector };
+static Lisp_Object concat (int nargs, Lisp_Object *args,
+enum concat_target_type target_type,
+int last_special);
+Lisp_Object
+concat2 (Lisp_Object s1, Lisp_Object s2)
+{
+Lisp_Object args[2];
+args[0] = s1;
+args[1] = s2;
+return concat (2, args, c_string, 0);
+}
+Lisp_Object
+concat3 (Lisp_Object s1, Lisp_Object s2, Lisp_Object s3)
+{
+Lisp_Object args[3];
+args[0] = s1;
+args[1] = s2;
+args[2] = s3;
+return concat (3, args, c_string, 0);
+}
+Lisp_Object
+vconcat2 (Lisp_Object s1, Lisp_Object s2)
+{
+Lisp_Object args[2];
+args[0] = s1;
+args[1] = s2;
+return concat (2, args, c_vector, 0);
+}
+Lisp_Object
+vconcat3 (Lisp_Object s1, Lisp_Object s2, Lisp_Object s3)
+{
+Lisp_Object args[3];
+args[0] = s1;
+args[1] = s2;
+args[2] = s3;
+return concat (3, args, c_vector, 0);
+}
+DEFUN ("append", Fappend, Sappend, 0, MANY, 0 /*
+Concatenate all the arguments and make the result a list.
+The result is a list whose elements are the elements of all the arguments.
+Each argument may be a list, vector, bit vector, or string.
+The last argument is not copied, just used as the tail of the new list.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+return concat (nargs, args, c_cons, 1);
+}
+DEFUN ("concat", Fconcat, Sconcat, 0, MANY, 0 /*
+Concatenate all the arguments and make the result a string.
+The result is a string whose elements are the elements of all the arguments.
+Each argument may be a string or a list or vector of characters (integers).
+Do not use individual integers as arguments!
+The behavior of `concat' in that case will be changed later!
+If your program passes an integer as an argument to `concat',
+you should change it right away not to do so.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+return concat (nargs, args, c_string, 0);
+}
+DEFUN ("vconcat", Fvconcat, Svconcat, 0, MANY, 0 /*
+Concatenate all the arguments and make the result a vector.
+The result is a vector whose elements are the elements of all the arguments.
+Each argument may be a list, vector, bit vector, or string.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+return concat (nargs, args, c_vector, 0);
+}
+DEFUN ("bvconcat", Fbvconcat, Sbvconcat, 0, MANY, 0 /*
+Concatenate all the arguments and make the result a bit vector.
+The result is a bit vector whose elements are the elements of all the
+arguments.  Each argument may be a list, vector, bit vector, or string.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+return concat (nargs, args, c_bit_vector, 0);
+}
+DEFUN ("copy-sequence", Fcopy_sequence, Scopy_sequence, 1, 1, 0 /*
+Return a copy of a list, vector, bit vector or string.
+The elements of a list or vector are not copied; they are shared
+with the original.
+*/ )
+(arg)
+Lisp_Object arg;
+{
+again:
+if (NILP (arg)) return arg;
+/* We handle conses separately because concat() is big and hairy and
+doesn't handle (copy-sequence '(a b . c)) and it's easier to redo this
+than to fix concat() without worrying about breaking other things.
+*/
+if (CONSP (arg))
+{
+Lisp_Object rest = arg;
+Lisp_Object head, tail;
+tail = Qnil;
+while (CONSP (rest))
+	{
+	  Lisp_Object new = Fcons (XCAR (rest), XCDR (rest));
+	  if (NILP (tail))
+	    head = tail = new;
+	  else
+	    XCDR (tail) = new, tail = new;
+	  rest = XCDR (rest);
+	  QUIT;
+	}
+if (!NILP (tail))
+	XCDR (tail) = rest;
+return head;
+}
+else if (STRINGP (arg))
+return concat (1, &arg, c_string, 0);
+else if (VECTORP (arg))
+return concat (1, &arg, c_vector, 0);
+else if (BIT_VECTORP (arg))
+return concat (1, &arg, c_bit_vector, 0);
+else
+{
+check_losing_bytecode ("copy-sequence", arg);
+arg = wrong_type_argument (Qsequencep, arg);
+goto again;
+}
+}
+struct merge_string_extents_struct
+{
+Lisp_Object string;
+Bytecount entry_offset;
+Bytecount entry_length;
+};
+static Lisp_Object
+concat (int nargs, Lisp_Object *args,
+enum concat_target_type target_type,
+int last_special)
+{
+Lisp_Object val;
+Lisp_Object tail = Qnil;
+int toindex;
+int argnum;
+Lisp_Object last_tail;
+Lisp_Object prev;
+struct merge_string_extents_struct *args_mse = 0;
+Bufbyte *string_result = 0;
+Bufbyte *string_result_ptr = 0;
+struct gcpro gcpro1;
+/* The modus operandi in Emacs is "caller gc-protects args".
+However, concat is called many times in Emacs on freshly
+created stuff.  So we help those callers out by protecting
+the args ourselves to save them a lot of temporary-variable
+grief. */
+GCPRO1 (args[0]);
+gcpro1.nvars = nargs;
+#ifdef I18N3
+/* #### if the result is a string and any of the strings have a string
+for the `string-translatable' property, then concat should also
+concat the args but use the `string-translatable' strings, and store
+the result in the returned string's `string-translatable' property. */
+#endif
+if (target_type == c_string)
+{
+args_mse = ((struct merge_string_extents_struct *)
+		  alloca (nargs *
+			  sizeof (struct merge_string_extents_struct)));
+}
+/* In append, the last arg isn't treated like the others */
+if (last_special && nargs > 0)
+{
+nargs--;
+last_tail = args[nargs];
+}
+else
+last_tail = Qnil;
+/* Check and coerce the arguments. */
+for (argnum = 0; argnum < nargs; argnum++)
+{
+Lisp_Object seq = args[argnum];
+if (CONSP (seq) || NILP (seq))
+;
+else if (VECTORP (seq) || STRINGP (seq) || BIT_VECTORP (seq))
+;
+#ifdef LOSING_BYTECODE
+else if (COMPILED_FUNCTIONP (seq))
+/* Urk!  We allow this, for "compatibility"... */
+;
+#endif
+else if (INTP (seq))
+/* This is too revolting to think about but maintains
+compatibility with FSF (and lots and lots of old code). */
+args[argnum] = Fnumber_to_string (seq);
+else
+	{
+check_losing_bytecode ("concat", seq);
+args[argnum] = wrong_type_argument (Qsequencep, seq);
+	}
+if (args_mse)
+{
+if (STRINGP (seq))
+args_mse[argnum].string = seq;
+else
+args_mse[argnum].string = Qnil;
+}
+}
+{
+/* Charcount is a misnomer here as we might be dealing with the
+length of a vector or list, but emphasizes that we're not dealing
+with Bytecounts in strings */
+Charcount total_length;
+for (argnum = 0, total_length = 0; argnum < nargs; argnum++)
+{
+#ifdef LOSING_BYTECODE
+Charcount thislen = length_with_bytecode_hack (args[argnum]);
+#else
+Charcount thislen = XINT (Flength (args[argnum]));
+#endif
+total_length += thislen;
+}
+switch (target_type)
+{
+case c_cons:
+if (total_length == 0)
+/* In append, if all but last arg are nil, return last arg */
+RETURN_UNGCPRO (last_tail);
+val = Fmake_list (make_int (total_length), Qnil);
+break;
+case c_vector:
+val = make_vector (total_length, Qnil);
+break;
+case c_bit_vector:
+val = make_bit_vector (total_length, Qzero);
+break;
+case c_string:
+	/* We don't make the string yet because we don't know the
+	   actual number of bytes.  This loop was formerly written
+	   to call Fmake_string() here and then call set_string_char()
+	   for each char.  This seems logical enough but is waaaaaaaay
+	   slow -- set_string_char() has to scan the whole string up
+	   to the place where the substitution is called for in order
+	   to find the place to change, and may have to do some
+	   realloc()ing in order to make the char fit properly.
+	   O(N^2) yuckage. */
+val = Qnil;
+	string_result = (Bufbyte *) alloca (total_length * MAX_EMCHAR_LEN);
+	string_result_ptr = string_result;
+break;
+default:
+abort ();
+}
+}
+if (CONSP (val))
+tail = val, toindex = -1;	/* -1 in toindex is flag we are
+				    making a list */
+else
+toindex = 0;
+prev = Qnil;
+for (argnum = 0; argnum < nargs; argnum++)
+{
+Charcount thisleni = 0;
+Charcount thisindex = 0;
+Lisp_Object seq = args[argnum];
+Bufbyte *string_source_ptr = 0;
+Bufbyte *string_prev_result_ptr = string_result_ptr;
+if (!CONSP (seq))
+	{
+#ifdef LOSING_BYTECODE
+	  thisleni = length_with_bytecode_hack (seq);
+#else
+	  thisleni = XINT (Flength (seq));
+#endif
+	}
+if (STRINGP (seq))
+	string_source_ptr = string_data (XSTRING (seq));
+while (1)
+	{
+	  Lisp_Object elt;
+	  /* We've come to the end of this arg, so exit. */
+	  if (NILP (seq))
+	    break;
+	  /* Fetch next element of `seq' arg into `elt' */
+	  if (CONSP (seq))
+{
+elt = Fcar (seq);
+seq = Fcdr (seq);
+}
+	  else
+	    {
+	      if (thisindex >= thisleni)
+		break;
+	      if (STRINGP (seq))
+		{
+		  elt = make_char (charptr_emchar (string_source_ptr));
+		  INC_CHARPTR (string_source_ptr);
+		}
+	      else if (VECTORP (seq))
+elt = vector_data (XVECTOR (seq))[thisindex];
+	      else if (BIT_VECTORP (seq))
+		elt = make_int (bit_vector_bit (XBIT_VECTOR (seq),
+						thisindex));
+else
+		elt = Felt (seq, make_int (thisindex));
+thisindex++;
+	    }
+	  /* Store into result */
+	  if (toindex < 0)
+	    {
+	      /* toindex negative means we are making a list */
+	      XCAR (tail) = elt;
+	      prev = tail;
+	      tail = XCDR (tail);
+	    }
+	  else if (VECTORP (val))
+	    vector_data (XVECTOR (val))[toindex++] = elt;
+	  else if (BIT_VECTORP (val))
+	    {
+	      CHECK_BIT (elt);
+	      set_bit_vector_bit (XBIT_VECTOR (val), toindex++, XINT (elt));
+	    }
+	  else
+	    {
+	      CHECK_CHAR_COERCE_INT (elt);
+	      string_result_ptr += set_charptr_emchar (string_result_ptr,
+						       XCHAR (elt));
+	    }
+	}
+if (args_mse)
+	{
+	  args_mse[argnum].entry_offset =
+	    string_prev_result_ptr - string_result;
+	  args_mse[argnum].entry_length =
+	    string_result_ptr - string_prev_result_ptr;
+	}
+}
+/* Now we finally make the string. */
+if (target_type == c_string)
+{
+val = make_string (string_result, string_result_ptr - string_result);
+for (argnum = 0; argnum < nargs; argnum++)
+	{
+	  if (STRINGP (args_mse[argnum].string))
+	    copy_string_extents (val, args_mse[argnum].string,
+				 args_mse[argnum].entry_offset, 0,
+				 args_mse[argnum].entry_length);
+	}
+}
+if (!NILP (prev))
+XCDR (prev) = last_tail;
+RETURN_UNGCPRO (val);
+}
+DEFUN ("copy-alist", Fcopy_alist, Scopy_alist, 1, 1, 0 /*
+Return a copy of ALIST.
+This is an alist which represents the same mapping from objects to objects,
+but does not share the alist structure with ALIST.
+The objects mapped (cars and cdrs of elements of the alist)
+are shared, however.
+Elements of ALIST that are not conses are also shared.
+*/ )
+(alist)
+Lisp_Object alist;
+{
+Lisp_Object tem;
+CHECK_LIST (alist);
+if (NILP (alist))
+return alist;
+alist = concat (1, &alist, c_cons, 0);
+for (tem = alist; CONSP (tem); tem = XCDR (tem))
+{
+Lisp_Object car;
+car = XCAR (tem);
+if (CONSP (car))
+	XCAR (tem) = Fcons (XCAR (car), XCDR (car));
+}
+return alist;
+}
+DEFUN ("copy-tree", Fcopy_tree, Scopy_tree, 1, 2, 0 /*
+Return a copy of a list and substructures.
+The argument is copied, and any lists contained within it are copied
+recursively.  Circularities and shared substructures are not preserved.
+Second arg VECP causes vectors to be copied, too.  Strings and bit vectors
+are not copied.
+*/ )
+(arg, vecp)
+Lisp_Object arg, vecp;
+{
+if (CONSP (arg))
+{
+Lisp_Object rest;
+rest = arg = Fcopy_sequence (arg);
+while (CONSP (rest))
+	{
+	  Lisp_Object elt = XCAR (rest);
+	  QUIT;
+	  if (CONSP (elt) || VECTORP (elt))
+	    XCAR (rest) = Fcopy_tree (elt, vecp);
+	  if (VECTORP (XCDR (rest))) /* hack for (a b . [c d]) */
+	    XCDR (rest) = Fcopy_tree (XCDR (rest), vecp);
+	  rest = XCDR (rest);
+	}
+}
+else if (VECTORP (arg) && ! NILP (vecp))
+{
+int i = vector_length (XVECTOR (arg));
+int j;
+arg = Fcopy_sequence (arg);
+for (j = 0; j < i; j++)
+	{
+	  Lisp_Object elt = vector_data (XVECTOR (arg)) [j];
+	  QUIT;
+	  if (CONSP (elt) || VECTORP (elt))
+	    vector_data (XVECTOR (arg)) [j] = Fcopy_tree (elt, vecp);
+	}
+}
+return arg;
+}
+DEFUN ("substring", Fsubstring, Ssubstring, 2, 3, 0 /*
+Return a substring of STRING, starting at index FROM and ending before TO.
+TO may be nil or omitted; then the substring runs to the end of STRING.
+If FROM or TO is negative, it counts from the end.
+Relevant parts of the string-extent-data are copied in the new string.
+*/ )
+(string, from, to)
+Lisp_Object string;
+Lisp_Object from, to;
+{
+Charcount ccfr, ccto;
+Bytecount bfr, bto;
+Lisp_Object val;
+CHECK_STRING (string);
+/* Historically, FROM could not be omitted.  Whatever ... */
+CHECK_INT (from);
+get_string_range_char (string, from, to, &ccfr, &ccto,
+			 GB_HISTORICAL_STRING_BEHAVIOR);
+bfr = charcount_to_bytecount (string_data (XSTRING (string)), ccfr);
+bto = charcount_to_bytecount (string_data (XSTRING (string)), ccto);
+val = make_string (string_data (XSTRING (string)) + bfr, bto - bfr);
+/* Copy any applicable extent information into the new string: */
+copy_string_extents (val, string, 0, bfr, bto - bfr);
+return (val);
+}
+DEFUN ("subseq", Fsubseq, Ssubseq, 2, 3, 0 /*
+Return a subsequence of SEQ, starting at index FROM and ending before TO.
+TO may be nil or omitted; then the subsequence runs to the end of SEQ.
+If FROM or TO is negative, it counts from the end.
+The resulting subsequence is always the same type as the original
+sequence.
+If SEQ is a string, relevant parts of the string-extent-data are copied
+in the new string.
+*/ )
+(seq, from, to)
+Lisp_Object seq;
+Lisp_Object from, to;
+{
+int len, f, t;
+if (STRINGP (seq))
+return Fsubstring (seq, from, to);
+if (CONSP (seq) || NILP (seq))
+;
+else if (VECTORP (seq) || BIT_VECTORP (seq))
+;
+else
+{
+check_losing_bytecode ("subseq", seq);
+seq = wrong_type_argument (Qsequencep, seq);
+}
+len = XINT (Flength (seq));
+CHECK_INT (from);
+f = XINT (from);
+if (f < 0)
+f = len + f;
+if (NILP (to))
+t = len;
+else
+{
+CHECK_INT (to);
+t = XINT (to);
+if (t < 0)
+	t = len + t;
+}
+if (!(0 <= f && f <= t && t <= len))
+args_out_of_range_3 (seq, make_int (f), make_int (t));
+if (VECTORP (seq))
+{
+Lisp_Object result = make_vector (t - f, Qnil);
+int i;
+Lisp_Object *in_elts = vector_data (XVECTOR (seq));
+Lisp_Object *out_elts = vector_data (XVECTOR (result));
+for (i = f; i < t; i++)
+	out_elts[i - f] = in_elts[i];
+return result;
+}
+if (CONSP (seq))
+{
+Lisp_Object result = Qnil;
+int i;
+seq = Fnthcdr (make_int (f), seq);
+for (i = f; i < t; i++)
+	{
+	  result = Fcons (Fcar (seq), result);
+	  seq = Fcdr (seq);
+	}
+return Fnreverse (result);
+}
+/* bit vector */
+{
+Lisp_Object result = make_bit_vector (t - f, Qzero);
+int i;
+for (i = f; i < t; i++)
+set_bit_vector_bit (XBIT_VECTOR (result), i - f,
+			  bit_vector_bit (XBIT_VECTOR (seq), i));
+return result;
+}
+}
+DEFUN ("nthcdr", Fnthcdr, Snthcdr, 2, 2, 0 /*
+Take cdr N times on LIST, returns the result.
+*/ )
+(n, list)
+Lisp_Object n;
+Lisp_Object list;
+{
+REGISTER int i, num;
+CHECK_INT (n);
+num = XINT (n);
+for (i = 0; i < num && !NILP (list); i++)
+{
+QUIT;
+list = Fcdr (list);
+}
+return list;
+}
+DEFUN ("nth", Fnth, Snth, 2, 2, 0 /*
+Return the Nth element of LIST.
+N counts from zero.  If LIST is not that long, nil is returned.
+*/ )
+(n, list)
+Lisp_Object n, list;
+{
+return Fcar (Fnthcdr (n, list));
+}
+DEFUN ("elt", Felt, Selt, 2, 2, 0 /*
+Return element of SEQUENCE at index N.
+*/ )
+(seq, n)
+Lisp_Object seq, n;
+{
+retry:
+CHECK_INT_COERCE_CHAR (n); /* yuck! */
+if (CONSP (seq) || NILP (seq))
+{
+Lisp_Object tem = Fnthcdr (n, seq);
+/* #### Utterly, completely, fucking disgusting.
+* #### The whole point of "elt" is that it operates on
+* #### sequences, and does error- (bounds-) checking.
+*/
+if (CONSP (tem))
+	return (XCAR (tem));
+else
+#if 1
+	/* This is The Way It Has Always Been. */
+	return Qnil;
+#else
+/* This is The Way Mly Says It Should Be. */
+args_out_of_range (seq, n);
+#endif
+}
+else if (STRINGP (seq)
+|| VECTORP (seq)
+|| BIT_VECTORP (seq))
+return (Faref (seq, n));
+#ifdef LOSING_BYTECODE
+else if (COMPILED_FUNCTIONP (seq))
+{
+int idx = XINT (n);
+if (idx < 0)
+{
+lose:
+args_out_of_range (seq, n);
+}
+/* Utter perversity */
+{
+struct Lisp_Compiled_Function *b = XCOMPILED_FUNCTION (seq);
+switch (idx)
+{
+case COMPILED_ARGLIST:
+return (b->arglist);
+case COMPILED_BYTECODE:
+return (b->bytecodes);
+case COMPILED_CONSTANTS:
+return (b->constants);
+case COMPILED_STACK_DEPTH:
+return (make_int (b->maxdepth));
+case COMPILED_DOC_STRING:
+	    return (compiled_function_documentation (b));
+case COMPILED_DOMAIN:
+	    return (compiled_function_domain (b));
+case COMPILED_INTERACTIVE:
+	    if (b->flags.interactivep)
+	      return (compiled_function_interactive (b));
+	    /* if we return nil, can't tell interactive with no args
+	       from noninteractive. */
+	    goto lose;
+default:
+goto lose;
+}
+}
+}
+#endif /* LOSING_BYTECODE */
+else
+{
+check_losing_bytecode ("elt", seq);
+seq = wrong_type_argument (Qsequencep, seq);
+goto retry;
+}
+}
+DEFUN ("member", Fmember, Smember, 2, 2, 0 /*
+Return non-nil if ELT is an element of LIST.  Comparison done with `equal'.
+The value is actually the tail of LIST whose car is ELT.
+*/ )
+(elt, list)
+Lisp_Object elt;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, tem;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+tem = Fcar (tail);
+if (! NILP (Fequal (elt, tem)))
+	return tail;
+QUIT;
+}
+return Qnil;
+}
+DEFUN ("memq", Fmemq, Smemq, 2, 2, 0 /*
+Return non-nil if ELT is an element of LIST.  Comparison done with `eq'.
+The value is actually the tail of LIST whose car is ELT.
+*/ )
+(elt, list)
+Lisp_Object elt;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, tem;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+tem = Fcar (tail);
+if (HACKEQ_UNSAFE (elt, tem)) return tail;
+QUIT;
+}
+return Qnil;
+}
+Lisp_Object
+memq_no_quit (Lisp_Object elt, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, tem;
+for (tail = list; CONSP (tail); tail = XCDR (tail))
+{
+tem = XCAR (tail);
+if (HACKEQ_UNSAFE (elt, tem)) return tail;
+}
+return Qnil;
+}
+DEFUN ("assoc", Fassoc, Sassoc, 2, 2, 0 /*
+Return non-nil if KEY is `equal' to the car of an element of LIST.
+The value is actually the element of LIST whose car equals KEY.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+/* This function can GC. */
+REGISTER Lisp_Object tail, elt, tem;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+elt = Fcar (tail);
+if (!CONSP (elt)) continue;
+tem = Fequal (Fcar (elt), key);
+if (!NILP (tem)) return elt;
+QUIT;
+}
+return Qnil;
+}
+Lisp_Object
+assoc_no_quit (Lisp_Object key, Lisp_Object list)
+{
+int speccount = specpdl_depth ();
+specbind (Qinhibit_quit, Qt);
+return (unbind_to (speccount, Fassoc (key, list)));
+}
+DEFUN ("assq", Fassq, Sassq, 2, 2, 0 /*
+Return non-nil if KEY is `eq' to the car of an element of LIST.
+The value is actually the element of LIST whose car is KEY.
+Elements of LIST that are not conses are ignored.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, elt, tem;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+elt = Fcar (tail);
+if (!CONSP (elt)) continue;
+tem = Fcar (elt);
+if (HACKEQ_UNSAFE (key, tem)) return elt;
+QUIT;
+}
+return Qnil;
+}
+/* Like Fassq but never report an error and do not allow quits.
+Use only on lists known never to be circular.  */
+Lisp_Object
+assq_no_quit (Lisp_Object key, Lisp_Object list)
+{
+/* This cannot GC. */
+REGISTER Lisp_Object tail, elt, tem;
+for (tail = list; CONSP (tail); tail = XCDR (tail))
+{
+elt = XCAR (tail);
+if (!CONSP (elt)) continue;
+tem = XCAR (elt);
+if (HACKEQ_UNSAFE (key, tem)) return elt;
+}
+return Qnil;
+}
+DEFUN ("rassoc", Frassoc, Srassoc, 2, 2, 0 /*
+Return non-nil if KEY is `equal' to the cdr of an element of LIST.
+The value is actually the element of LIST whose cdr equals KEY.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+REGISTER Lisp_Object elt, tem;
+elt = Fcar (tail);
+if (!CONSP (elt)) continue;
+tem = Fequal (Fcdr (elt), key);
+if (!NILP (tem)) return elt;
+QUIT;
+}
+return Qnil;
+}
+DEFUN ("rassq", Frassq, Srassq, 2, 2, 0 /*
+Return non-nil if KEY is `eq' to the cdr of an element of LIST.
+The value is actually the element of LIST whose cdr is KEY.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, elt, tem;
+for (tail = list; !NILP (tail); tail = Fcdr (tail))
+{
+elt = Fcar (tail);
+if (!CONSP (elt)) continue;
+tem = Fcdr (elt);
+if (HACKEQ_UNSAFE (key, tem)) return elt;
+QUIT;
+}
+return Qnil;
+}
+Lisp_Object
+rassq_no_quit (Lisp_Object key, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, elt, tem;
+for (tail = list; CONSP (tail); tail = XCDR (tail))
+{
+elt = XCAR (tail);
+if (!CONSP (elt)) continue;
+tem = XCDR (elt);
+if (HACKEQ_UNSAFE (key, tem)) return elt;
+}
+return Qnil;
+}
+DEFUN ("delete", Fdelete, Sdelete, 2, 2, 0 /*
+Delete by side effect any occurrences of ELT as a member of LIST.
+The modified LIST is returned.  Comparison is done with `equal'.
+If the first member of LIST is ELT, there is no way to remove it by side
+effect; therefore, write `(setq foo (delete element foo))' to be sure
+of changing the value of `foo'.
+*/ )
+(elt, list)
+Lisp_Object elt;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+if (!NILP (Fequal (elt, Fcar (tail))))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+DEFUN ("delq", Fdelq, Sdelq, 2, 2, 0 /*
+Delete by side effect any occurrences of ELT as a member of LIST.
+The modified LIST is returned.  Comparison is done with `eq'.
+If the first member of LIST is ELT, there is no way to remove it by side
+effect; therefore, write `(setq foo (delq element foo))' to be sure of
+changing the value of `foo'.
+*/ )
+(elt, list)
+Lisp_Object elt;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+REGISTER Lisp_Object tem;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+tem = Fcar (tail);
+if (HACKEQ_UNSAFE (elt, tem))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+/* no quit, no errors; be careful */
+Lisp_Object
+delq_no_quit (Lisp_Object elt, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, prev;
+REGISTER Lisp_Object tem;
+tail = list;
+prev = Qnil;
+while (CONSP (tail))
+{
+tem = XCAR (tail);
+if (HACKEQ_UNSAFE (elt, tem))
+	{
+	  if (NILP (prev))
+	    list = XCDR (tail);
+	  else
+	    XCDR (prev) = XCDR (tail);
+	}
+else
+	prev = tail;
+tail = XCDR (tail);
+}
+return list;
+}
+/* Be VERY careful with this.  This is like delq_no_quit() but
+also calls free_cons() on the removed conses.  You must be SURE
+that no pointers to the freed conses remain around (e.g.
+someone else is pointing to part of the list).  This function
+is useful on internal lists that are used frequently and where
+the actual list doesn't escape beyond known code bounds. */
+Lisp_Object
+delq_no_quit_and_free_cons (Lisp_Object elt, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, prev;
+REGISTER Lisp_Object tem;
+tail = list;
+prev = Qnil;
+while (CONSP (tail))
+{
+Lisp_Object cons_to_free = Qnil;
+tem = XCAR (tail);
+if (HACKEQ_UNSAFE (elt, tem))
+	{
+	  if (NILP (prev))
+	    list = XCDR (tail);
+	  else
+	    XCDR (prev) = XCDR (tail);
+	  cons_to_free = tail;
+	}
+else
+	prev = tail;
+tail = XCDR (tail);
+if (!NILP (cons_to_free))
+	free_cons (XCONS (cons_to_free));
+}
+return list;
+}
+DEFUN ("remassoc", Fremassoc, Sremassoc, 2, 2, 0 /*
+Delete by side effect any elements of LIST whose car is `equal' to KEY.
+The modified LIST is returned.  If the first member of LIST has a car
+that is `equal' to KEY, there is no way to remove it by side effect;
+therefore, write `(setq foo (remassoc key foo))' to be sure of changing
+the value of `foo'.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+Lisp_Object elt = Fcar (tail);
+if (CONSP (elt) && ! NILP (Fequal (key, Fcar (elt))))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+Lisp_Object
+remassoc_no_quit (Lisp_Object key, Lisp_Object list)
+{
+int speccount = specpdl_depth ();
+specbind (Qinhibit_quit, Qt);
+return (unbind_to (speccount, Fremassoc (key, list)));
+}
+DEFUN ("remassq", Fremassq, Sremassq, 2, 2, 0 /*
+Delete by side effect any elements of LIST whose car is `eq' to KEY.
+The modified LIST is returned.  If the first member of LIST has a car
+that is `eq' to KEY, there is no way to remove it by side effect;
+therefore, write `(setq foo (remassq key foo))' to be sure of changing
+the value of `foo'.
+*/ )
+(key, list)
+Lisp_Object key;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+Lisp_Object elt = Fcar (tail);
+if (CONSP (elt) && HACKEQ_UNSAFE (key, Fcar (elt)))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+/* no quit, no errors; be careful */
+Lisp_Object
+remassq_no_quit (Lisp_Object key, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, prev;
+REGISTER Lisp_Object tem;
+tail = list;
+prev = Qnil;
+while (CONSP (tail))
+{
+tem = XCAR (tail);
+if (CONSP (tem) && HACKEQ_UNSAFE (key, XCAR (tem)))
+	{
+	  if (NILP (prev))
+	    list = XCDR (tail);
+	  else
+	    XCDR (prev) = XCDR (tail);
+	}
+else
+	prev = tail;
+tail = XCDR (tail);
+}
+return list;
+}
+DEFUN ("remrassoc", Fremrassoc, Sremrassoc, 2, 2, 0 /*
+Delete by side effect any elements of LIST whose cdr is `equal' to VALUE.
+The modified LIST is returned.  If the first member of LIST has a car
+that is `equal' to VALUE, there is no way to remove it by side effect;
+therefore, write `(setq foo (remrassoc value foo))' to be sure of changing
+the value of `foo'.
+*/ )
+(value, list)
+Lisp_Object value;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+Lisp_Object elt = Fcar (tail);
+if (CONSP (elt) && ! NILP (Fequal (value, Fcdr (elt))))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+DEFUN ("remrassq", Fremrassq, Sremrassq, 2, 2, 0 /*
+Delete by side effect any elements of LIST whose cdr is `eq' to VALUE.
+The modified LIST is returned.  If the first member of LIST has a car
+that is `eq' to VALUE, there is no way to remove it by side effect;
+therefore, write `(setq foo (remrassq value foo))' to be sure of changing
+the value of `foo'.
+*/ )
+(value, list)
+Lisp_Object value;
+Lisp_Object list;
+{
+REGISTER Lisp_Object tail, prev;
+tail = list;
+prev = Qnil;
+while (!NILP (tail))
+{
+Lisp_Object elt = Fcar (tail);
+if (CONSP (elt) && HACKEQ_UNSAFE (value, Fcdr (elt)))
+	{
+	  if (NILP (prev))
+	    list = Fcdr (tail);
+	  else
+	    Fsetcdr (prev, Fcdr (tail));
+	}
+else
+	prev = tail;
+tail = Fcdr (tail);
+QUIT;
+}
+return list;
+}
+/* no quit, no errors; be careful */
+Lisp_Object
+remrassq_no_quit (Lisp_Object value, Lisp_Object list)
+{
+REGISTER Lisp_Object tail, prev;
+REGISTER Lisp_Object tem;
+tail = list;
+prev = Qnil;
+while (CONSP (tail))
+{
+tem = XCAR (tail);
+if (CONSP (tem) && HACKEQ_UNSAFE (value, XCDR (tem)))
+	{
+	  if (NILP (prev))
+	    list = XCDR (tail);
+	  else
+	    XCDR (prev) = XCDR (tail);
+	}
+else
+	prev = tail;
+tail = XCDR (tail);
+}
+return list;
+}
+DEFUN ("nreverse", Fnreverse, Snreverse, 1, 1, 0 /*
+Reverse LIST by modifying cdr pointers.
+Returns the beginning of the reversed list.
+*/ )
+(list)
+Lisp_Object list;
+{
+Lisp_Object prev, tail, next;
+struct gcpro gcpro1, gcpro2;
+/* We gcpro our args; see `nconc' */
+prev = Qnil;
+tail = list;
+GCPRO2 (prev, tail);
+while (!NILP (tail))
+{
+QUIT;
+next = Fcdr (tail);
+Fsetcdr (tail, prev);
+prev = tail;
+tail = next;
+}
+UNGCPRO;
+return prev;
+}
+DEFUN ("reverse", Freverse, Sreverse, 1, 1, 0 /*
+Reverse LIST, copying.  Returns the beginning of the reversed list.
+See also the function `nreverse', which is used more often.
+*/ )
+(list)
+Lisp_Object list;
+{
+Lisp_Object length;
+Lisp_Object *vec;
+Lisp_Object tail;
+REGISTER int i;
+length = Flength (list);
+vec = (Lisp_Object *) alloca (XINT (length) * sizeof (Lisp_Object));
+for (i = XINT (length) - 1, tail = list; i >= 0; i--, tail = Fcdr (tail))
+vec[i] = Fcar (tail);
+return Flist (XINT (length), vec);
+}
+static Lisp_Object list_merge (Lisp_Object org_l1, Lisp_Object org_l2,
+Lisp_Object lisp_arg,
+int (*pred_fn) (Lisp_Object, Lisp_Object,
+Lisp_Object lisp_arg));
+Lisp_Object
+list_sort (Lisp_Object list,
+Lisp_Object lisp_arg,
+int (*pred_fn) (Lisp_Object, Lisp_Object,
+Lisp_Object lisp_arg))
+{
+Lisp_Object front, back;
+Lisp_Object len, tem;
+struct gcpro gcpro1, gcpro2, gcpro3;
+int length;
+front = list;
+len = Flength (list);
+length = XINT (len);
+if (length < 2)
+return list;
+XSETINT (len, (length / 2) - 1);
+tem = Fnthcdr (len, list);
+back = Fcdr (tem);
+Fsetcdr (tem, Qnil);
+GCPRO3 (front, back, lisp_arg);
+front = list_sort (front, lisp_arg, pred_fn);
+back = list_sort (back, lisp_arg, pred_fn);
+UNGCPRO;
+return list_merge (front, back, lisp_arg, pred_fn);
+}
+static int
+merge_pred_function (Lisp_Object obj1, Lisp_Object obj2,
+Lisp_Object pred)
+{
+Lisp_Object tmp;
+/* prevents the GC from happening in call2 */
+int speccount = specpdl_depth ();
+/* Emacs' GC doesn't actually relocate pointers, so this probably
+isn't strictly necessary */
+record_unwind_protect (restore_gc_inhibit,
+make_int (gc_currently_forbidden));
+gc_currently_forbidden = 1;
+tmp = call2 (pred, obj1, obj2);
+unbind_to (speccount, Qnil);
+if (NILP (tmp))
+return -1;
+else
+return 1;
+}
+DEFUN ("sort", Fsort, Ssort, 2, 2, 0 /*
+Sort LIST, stably, comparing elements using PREDICATE.
+Returns the sorted list.  LIST is modified by side effects.
+PREDICATE is called with two elements of LIST, and should return T
+if the first element is \"less\" than the second.
+*/ )
+(list, pred)
+Lisp_Object list, pred;
+{
+return list_sort (list, pred, merge_pred_function);
+}
+Lisp_Object
+merge (Lisp_Object org_l1, Lisp_Object org_l2,
+Lisp_Object pred)
+{
+return list_merge (org_l1, org_l2, pred, merge_pred_function);
+}
+static Lisp_Object
+list_merge (Lisp_Object org_l1, Lisp_Object org_l2,
+Lisp_Object lisp_arg,
+int (*pred_fn) (Lisp_Object, Lisp_Object, Lisp_Object lisp_arg))
+{
+Lisp_Object value;
+Lisp_Object tail;
+Lisp_Object tem;
+Lisp_Object l1, l2;
+struct gcpro gcpro1, gcpro2, gcpro3, gcpro4;
+l1 = org_l1;
+l2 = org_l2;
+tail = Qnil;
+value = Qnil;
+/* It is sufficient to protect org_l1 and org_l2.
+When l1 and l2 are updated, we copy the new values
+back into the org_ vars.  */
+GCPRO4 (org_l1, org_l2, lisp_arg, value);
+while (1)
+{
+if (NILP (l1))
+	{
+	  UNGCPRO;
+	  if (NILP (tail))
+	    return l2;
+	  Fsetcdr (tail, l2);
+	  return value;
+	}
+if (NILP (l2))
+	{
+	  UNGCPRO;
+	  if (NILP (tail))
+	    return l1;
+	  Fsetcdr (tail, l1);
+	  return value;
+	}
+if (((*pred_fn) (Fcar (l2), Fcar (l1), lisp_arg)) < 0)
+	{
+	  tem = l1;
+	  l1 = Fcdr (l1);
+	  org_l1 = l1;
+	}
+else
+	{
+	  tem = l2;
+	  l2 = Fcdr (l2);
+	  org_l2 = l2;
+	}
+if (NILP (tail))
+	value = tem;
+else
+	Fsetcdr (tail, tem);
+tail = tem;
+}
+}
+/************************************************************************/
+/*	  	        property-list functions				*/
+/************************************************************************/
+/* For properties of text, we need to do order-insensitive comparison of
+plists.  That is, we need to compare two plists such that they are the
+same if they have the same set of keys, and equivalent values.
+So (a 1 b 2) would be equal to (b 2 a 1).
+NIL_MEANS_NOT_PRESENT is as in `plists-eq' etc.
+LAXP means use `equal' for comparisons.
+*/
+int
+plists_differ (Lisp_Object a, Lisp_Object b, int nil_means_not_present,
+	       int laxp, int depth)
+{
+int eqp = (depth == -1);	/* -1 as depth means us eq, not equal. */
+int la, lb, m, i, fill;
+Lisp_Object *keys, *vals;
+char *flags;
+Lisp_Object rest;
+if (NILP (a) && NILP (b))
+return 0;
+Fcheck_valid_plist (a);
+Fcheck_valid_plist (b);
+la = XINT (Flength (a));
+lb = XINT (Flength (b));
+m = (la > lb ? la : lb);
+fill = 0;
+keys = (Lisp_Object *) alloca (m * sizeof (Lisp_Object));
+vals = (Lisp_Object *) alloca (m * sizeof (Lisp_Object));
+flags = (char *) alloca (m * sizeof (char));
+/* First extract the pairs from A. */
+for (rest = a; !NILP (rest); rest = XCDR (XCDR (rest)))
+{
+Lisp_Object k = XCAR (rest);
+Lisp_Object v = XCAR (XCDR (rest));
+/* Maybe be Ebolified. */
+if (nil_means_not_present && NILP (v)) continue;
+keys [fill] = k;
+vals [fill] = v;
+flags[fill] = 0;
+fill++;
+}
+/* Now iterate over B, and stop if we find something that's not in A,
+or that doesn't match.  As we match, mark them. */
+for (rest = b; !NILP (rest); rest = XCDR (XCDR (rest)))
+{
+Lisp_Object k = XCAR (rest);
+Lisp_Object v = XCAR (XCDR (rest));
+/* Maybe be Ebolified. */
+if (nil_means_not_present && NILP (v)) continue;
+for (i = 0; i < fill; i++)
+	{
+	  if (!laxp ? EQ (k, keys [i]) : internal_equal (k, keys [i], depth))
+	    {
+	      if ((eqp
+		   /* Ebolified here too, sigh ... */
+		   ? !HACKEQ_UNSAFE (v, vals [i])
+		   : !internal_equal (v, vals [i], depth)))
+		/* a property in B has a different value than in A */
+		goto MISMATCH;
+	      flags [i] = 1;
+	      break;
+	    }
+	}
+if (i == fill)
+	/* there are some properties in B that are not in A */
+	goto MISMATCH;
+}
+/* Now check to see that all the properties in A were also in B */
+for (i = 0; i < fill; i++)
+if (flags [i] == 0)
+goto MISMATCH;
+/* Ok. */
+return 0;
+MISMATCH:
+return 1;
+}
+DEFUN ("plists-eq", Fplists_eq, Splists_eq, 2, 3, 0 /*
+Return non-nil if property lists A and B are `eq'.
+A property list is an alternating list of keywords and values.
+This function does order-insensitive comparisons of the property lists:
+For example, the property lists '(a 1 b 2) and '(b 2 a 1) are equal.
+Comparison between values is done using `eq'.  See also `plists-equal'.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is ignored.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+*/ )
+(a, b, nil_means_not_present)
+Lisp_Object a, b, nil_means_not_present;
+{
+return (plists_differ (a, b, !NILP (nil_means_not_present), 0, -1)
+	  ? Qnil : Qt);
+}
+DEFUN ("plists-equal", Fplists_equal, Splists_equal, 2, 3, 0 /*
+Return non-nil if property lists A and B are `equal'.
+A property list is an alternating list of keywords and values.  This
+function does order-insensitive comparisons of the property lists: For
+example, the property lists '(a 1 b 2) and '(b 2 a 1) are equal.
+Comparison between values is done using `equal'.  See also `plists-eq'.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is ignored.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+*/ )
+(a, b, nil_means_not_present)
+Lisp_Object a, b, nil_means_not_present;
+{
+return (plists_differ (a, b, !NILP (nil_means_not_present), 0, 1)
+	  ? Qnil : Qt);
+}
+DEFUN ("lax-plists-eq", Flax_plists_eq, Slax_plists_eq, 2, 3, 0 /*
+Return non-nil if lax property lists A and B are `eq'.
+A property list is an alternating list of keywords and values.
+This function does order-insensitive comparisons of the property lists:
+For example, the property lists '(a 1 b 2) and '(b 2 a 1) are equal.
+Comparison between values is done using `eq'.  See also `plists-equal'.
+A lax property list is like a regular one except that comparisons between
+keywords is done using `equal' instead of `eq'.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is ignored.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+*/ )
+(a, b, nil_means_not_present)
+Lisp_Object a, b, nil_means_not_present;
+{
+return (plists_differ (a, b, !NILP (nil_means_not_present), 1, -1)
+	  ? Qnil : Qt);
+}
+DEFUN ("lax-plists-equal", Flax_plists_equal, Slax_plists_equal, 2, 3, 0 /*
+Return non-nil if lax property lists A and B are `equal'.
+A property list is an alternating list of keywords and values.  This
+function does order-insensitive comparisons of the property lists: For
+example, the property lists '(a 1 b 2) and '(b 2 a 1) are equal.
+Comparison between values is done using `equal'.  See also `plists-eq'.
+A lax property list is like a regular one except that comparisons between
+keywords is done using `equal' instead of `eq'.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is ignored.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+*/ )
+(a, b, nil_means_not_present)
+Lisp_Object a, b, nil_means_not_present;
+{
+return (plists_differ (a, b, !NILP (nil_means_not_present), 1, 1)
+	  ? Qnil : Qt);
+}
+/* Return the value associated with key PROPERTY in property list PLIST.
+Return nil if key not found.  This function is used for internal
+property lists that cannot be directly manipulated by the user.
+*/
+Lisp_Object
+internal_plist_get (Lisp_Object plist, Lisp_Object property)
+{
+Lisp_Object tail = plist;
+for (; !NILP (tail); tail = XCDR (XCDR (tail)))
+{
+struct Lisp_Cons *c = XCONS (tail);
+if (EQ (c->car, property))
+	return XCAR (c->cdr);
+}
+return Qunbound;
+}
+/* Set PLIST's value for PROPERTY to VALUE.  Analogous to
+internal_plist_get(). */
+void
+internal_plist_put (Lisp_Object *plist, Lisp_Object property,
+		    Lisp_Object value)
+{
+Lisp_Object tail = *plist;
+for (; !NILP (tail); tail = XCDR (XCDR (tail)))
+{
+struct Lisp_Cons *c = XCONS (tail);
+if (EQ (c->car, property))
+	{
+	  XCAR (c->cdr) = value;
+	  return;
+	}
+}
+*plist = Fcons (property, Fcons (value, *plist));
+}
+int
+internal_remprop (Lisp_Object *plist, Lisp_Object property)
+{
+Lisp_Object tail = *plist;
+if (NILP (tail))
+return 0;
+if (EQ (XCAR (tail), property))
+{
+*plist = XCDR (XCDR (tail));
+return 1;
+}
+for (tail = XCDR (tail); !NILP (XCDR (tail));
+tail = XCDR (XCDR (tail)))
+{
+struct Lisp_Cons *c = XCONS (tail);
+if (EQ (XCAR (c->cdr), property))
+	{
+	  c->cdr = XCDR (XCDR (c->cdr));
+	  return 1;
+	}
+}
+return 0;
+}
+/* Called on a malformed property list.  BADPLACE should be some
+place where truncating will form a good list -- i.e. we shouldn't
+result in a list with an odd length. */
+static Lisp_Object
+bad_bad_bunny (Lisp_Object *plist, Lisp_Object *badplace, Error_behavior errb)
+{
+if (ERRB_EQ (errb, ERROR_ME))
+return Fsignal (Qmalformed_property_list, list2 (*plist, *badplace));
+else
+{
+if (ERRB_EQ (errb, ERROR_ME_WARN))
+	{
+	  warn_when_safe_lispobj
+	    (Qlist, Qwarning,
+	     list2 (build_string
+		    ("Malformed property list -- list has been truncated"),
+		    *plist));
+	  *badplace = Qnil;
+	}
+return Qunbound;
+}
+}
+/* Called on a circular property list.  BADPLACE should be some place
+where truncating will result in an even-length list, as above.
+If doesn't particularly matter where we truncate -- anywhere we
+truncate along the entire list will break the circularity, because
+it will create a terminus and the list currently doesn't have one.
+*/
+static Lisp_Object
+bad_bad_turtle (Lisp_Object *plist, Lisp_Object *badplace, Error_behavior errb)
+{
+if (ERRB_EQ (errb, ERROR_ME))
+/* #### Eek, this will probably result in another error
+when PLIST is printed out */
+return Fsignal (Qcircular_property_list, list1 (*plist));
+else
+{
+if (ERRB_EQ (errb, ERROR_ME_WARN))
+	{
+	  warn_when_safe_lispobj
+	    (Qlist, Qwarning,
+	     list2 (build_string
+		    ("Circular property list -- list has been truncated"),
+		    *plist));
+	  *badplace = Qnil;
+	}
+return Qunbound;
+}
+}
+/* Advance the tortoise pointer by two (one iteration of a property-list
+loop) and the hare pointer by four and verify that no malformations
+or circularities exist.  If so, return zero and store a value into
+RETVAL that should be returned by the calling function.  Otherwise,
+return 1.  See external_plist_get().
+*/
+static int
+advance_plist_pointers (Lisp_Object *plist,
+			Lisp_Object **tortoise, Lisp_Object **hare,
+			Error_behavior errb, Lisp_Object *retval)
+{
+int i;
+Lisp_Object *tortsave = *tortoise;
+/* Note that our "fixing" may be more brutal than necessary,
+but it's the user's own problem, not ours. if they went in and
+manually fucked up a plist. */
+for (i = 0; i < 2; i++)
+{
+/* This is a standard iteration of a defensive-loop-checking
+loop.  We just do it twice because we want to advance past
+	 both the property and its value.
+	 If the pointer indirection is confusing you, remember that
+	 one level of indirection on the hare and tortoise pointers
+	 is only due to pass-by-reference for this function.  The other
+	 level is so that the plist can be fixed in place. */
+/* When we reach the end of a well-formed plist, **HARE is
+	 nil.  In that case, we don't do anything at all except
+	 advance TORTOISE by one.  Otherwise, we advance HARE
+	 by two (making sure it's OK to do so), then advance
+	 TORTOISE by one (it will always be OK to do so because
+	 the HARE is always ahead of the TORTOISE and will have
+	 already verified the path), then make sure TORTOISE and
+	 HARE don't contain the same non-nil object -- if the
+	 TORTOISE and the HARE ever meet, then obviously we're
+	 in a circularity, and if we're in a circularity, then
+	 the TORTOISE and the HARE can't cross paths without
+	 meeting, since the HARE only gains one step over the
+	 TORTOISE per iteration. */
+if (!NILP (**hare))
+	{
+	  Lisp_Object *haresave = *hare;
+	  if (!CONSP (**hare))
+	    {
+	      *retval = bad_bad_bunny (plist, haresave, errb);
+	      return 0;
+	    }
+	  *hare = &XCDR (**hare);
+	  /* In a non-plist, we'd check here for a nil value for
+	     **HARE, which is OK (it just means the list has an
+	     odd number of elements).  In a plist, it's not OK
+	     for the list to have an odd number of elements. */
+	  if (!CONSP (**hare))
+	    {
+	      *retval = bad_bad_bunny (plist, haresave, errb);
+	      return 0;
+	    }
+	  *hare = &XCDR (**hare);
+	}
+*tortoise = &XCDR (**tortoise);
+if (!NILP (**hare) && EQ (**tortoise, **hare))
+	{
+	  *retval = bad_bad_turtle (plist, tortsave, errb);
+	  return 0;
+	}
+}
+return 1;
+}
+/* Return the value of PROPERTY from PLIST, or Qunbound if
+property is not on the list.
+PLIST is a Lisp-accessible property list, meaning that it
+has to be checked for malformations and circularities.
+If ERRB is ERROR_ME, an error will be signalled.  Otherwise, the
+function will never signal an error; and if ERRB is ERROR_ME_WARN,
+on finding a malformation or a circularity, it issues a warning and
+attempts to silently fix the problem.
+A pointer to PLIST is passed in so that PLIST can be successfully
+"fixed" even if the error is at the beginning of the plist. */
+Lisp_Object
+external_plist_get (Lisp_Object *plist, Lisp_Object property,
+		    int laxp, Error_behavior errb)
+{
+Lisp_Object *tortoise = plist;
+Lisp_Object *hare = plist;
+while (!NILP (*tortoise))
+{
+Lisp_Object *tortsave = tortoise;
+Lisp_Object retval;
+/* We do the standard tortoise/hare march.  We isolate the
+	 grungy stuff to do this in advance_plist_pointers(), though.
+	 To us, all this function does is advance the tortoise
+	 pointer by two and the hare pointer by four and make sure
+	 everything's OK.  We first advance the pointers and then
+	 check if a property matched; this ensures that our
+	 check for a matching property is safe. */
+if (!advance_plist_pointers (plist, &tortoise, &hare, errb, &retval))
+	return retval;
+if (!laxp ? EQ (XCAR (*tortsave), property)
+	  : internal_equal (XCAR (*tortsave), property, 0))
+	return XCAR (XCDR (*tortsave));
+}
+return Qunbound;
+}
+/* Set PLIST's value for PROPERTY to VALUE, given a possibly
+malformed or circular plist.  Analogous to external_plist_get(). */
+void
+external_plist_put (Lisp_Object *plist, Lisp_Object property,
+		    Lisp_Object value, int laxp, Error_behavior errb)
+{
+Lisp_Object *tortoise = plist;
+Lisp_Object *hare = plist;
+while (!NILP (*tortoise))
+{
+Lisp_Object *tortsave = tortoise;
+Lisp_Object retval;
+/* See above */
+if (!advance_plist_pointers (plist, &tortoise, &hare, errb, &retval))
+	return;
+if (!laxp ? EQ (XCAR (*tortsave), property)
+	  : internal_equal (XCAR (*tortsave), property, 0))
+	{
+	  XCAR (XCDR (*tortsave)) = value;
+	  return;
+	}
+}
+*plist = Fcons (property, Fcons (value, *plist));
+}
+int
+external_remprop (Lisp_Object *plist, Lisp_Object property,
+		  int laxp, Error_behavior errb)
+{
+Lisp_Object *tortoise = plist;
+Lisp_Object *hare = plist;
+while (!NILP (*tortoise))
+{
+Lisp_Object *tortsave = tortoise;
+Lisp_Object retval;
+/* See above */
+if (!advance_plist_pointers (plist, &tortoise, &hare, errb, &retval))
+	return 0;
+if (!laxp ? EQ (XCAR (*tortsave), property)
+	  : internal_equal (XCAR (*tortsave), property, 0))
+	{
+	  /* Now you see why it's so convenient to have that level
+	     of indirection. */
+	  *tortsave = XCDR (XCDR (*tortsave));
+	  return 1;
+	}
+}
+return 0;
+}
+DEFUN ("plist-get", Fplist_get, Splist_get, 2, 3, 0 /*
+Extract a value from a property list.
+PLIST is a property list, which is a list of the form
+\(PROP1 VALUE1 PROP2 VALUE2...).  This function returns the value
+corresponding to the given PROP, or DEFAULT if PROP is not
+one of the properties on the list.
+*/ )
+(plist, prop, defalt)           /* Cant spel in C */
+Lisp_Object plist, prop, defalt;
+{
+Lisp_Object val = external_plist_get (&plist, prop, 0, ERROR_ME);
+if (UNBOUNDP (val))
+return defalt;
+return val;
+}
+DEFUN ("plist-put", Fplist_put, Splist_put, 3, 3, 0 /*
+Change value in PLIST of PROP to VAL.
+PLIST is a property list, which is a list of the form \(PROP1 VALUE1
+PROP2 VALUE2 ...).  PROP is usually a symbol and VAL is any object.
+If PROP is already a property on the list, its value is set to VAL,
+otherwise the new PROP VAL pair is added.  The new plist is returned;
+use `(setq x (plist-put x prop val))' to be sure to use the new value.
+The PLIST is modified by side effects.
+*/ )
+(plist, prop, val)
+Lisp_Object plist, prop, val;
+{
+external_plist_put (&plist, prop, val, 0, ERROR_ME);
+return plist;
+}
+DEFUN ("plist-remprop", Fplist_remprop, Splist_remprop, 2, 2, 0 /*
+Remove from PLIST the property PROP and its value.
+PLIST is a property list, which is a list of the form \(PROP1 VALUE1
+PROP2 VALUE2 ...).  PROP is usually a symbol.  The new plist is
+returned; use `(setq x (plist-remprop x prop val))' to be sure to use
+the new value.  The PLIST is modified by side effects.
+*/ )
+(plist, prop)
+Lisp_Object plist, prop;
+{
+external_remprop (&plist, prop, 0, ERROR_ME);
+return plist;
+}
+DEFUN ("plist-member", Fplist_member, Splist_member, 2, 2, 0 /*
+Return t if PROP has a value specified in PLIST.
+*/ )
+(plist, prop)
+Lisp_Object plist, prop;
+{
+return UNBOUNDP (Fplist_get (plist, prop, Qunbound)) ? Qnil : Qt;
+}
+DEFUN ("check-valid-plist", Fcheck_valid_plist, Scheck_valid_plist,
+1, 1, 0 /*
+Given a plist, signal an error if there is anything wrong with it.
+This means that it's a malformed or circular plist.
+*/ )
+(plist)
+Lisp_Object plist;
+{
+Lisp_Object *tortoise;
+Lisp_Object *hare;
+start_over:
+tortoise = &plist;
+hare = &plist;
+while (!NILP (*tortoise))
+{
+Lisp_Object retval;
+/* See above */
+if (!advance_plist_pointers (&plist, &tortoise, &hare, ERROR_ME,
+				   &retval))
+	goto start_over;
+}
+return Qnil;
+}
+DEFUN ("valid-plist-p", Fvalid_plist_p, Svalid_plist_p,
+1, 1, 0 /*
+Given a plist, return non-nil if its format is correct.
+If it returns nil, `check-valid-plist' will signal an error when given
+the plist; that means it's a malformed or circular plist or has non-symbols
+as keywords.
+*/ )
+(plist)
+Lisp_Object plist;
+{
+Lisp_Object *tortoise;
+Lisp_Object *hare;
+tortoise = &plist;
+hare = &plist;
+while (!NILP (*tortoise))
+{
+Lisp_Object retval;
+/* See above */
+if (!advance_plist_pointers (&plist, &tortoise, &hare, ERROR_ME_NOT,
+				   &retval))
+	return Qnil;
+}
+return Qt;
+}
+DEFUN ("canonicalize-plist", Fcanonicalize_plist, Scanonicalize_plist,
+1, 2, 0 /*
+Destructively remove any duplicate entries from a plist.
+In such cases, the first entry applies.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is removed.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+The new plist is returned.  If NIL-MEANS-NOT-PRESENT is given, the
+return value may not be EQ to the passed-in value, so make sure to
+`setq' the value back into where it came from.
+*/ )
+(plist, nil_means_not_present)
+Lisp_Object plist, nil_means_not_present;
+{
+Lisp_Object head = plist;
+Fcheck_valid_plist (plist);
+while (!NILP (plist))
+{
+Lisp_Object prop = Fcar (plist);
+Lisp_Object next = Fcdr (plist);
+CHECK_CONS (next); /* just make doubly sure we catch any errors */
+if (!NILP (nil_means_not_present) && NILP (Fcar (next)))
+	{
+	  if (EQ (head, plist))
+	    head = Fcdr (next);
+	  plist = Fcdr (next);
+	  continue;
+	}
+/* external_remprop returns 1 if it removed any property.
+	 We have to loop till it didn't remove anything, in case
+	 the property occurs many times. */
+while (external_remprop (&XCDR (next), prop, 0, ERROR_ME));
+plist = Fcdr (next);
+}
+return head;
+}
+DEFUN ("lax-plist-get", Flax_plist_get, Slax_plist_get, 2, 3, 0 /*
+Extract a value from a lax property list.
+LAX-PLIST is a lax property list, which is a list of the form \(PROP1
+VALUE1 PROP2 VALUE2...), where comparions between properties is done
+using `equal' instead of `eq'.  This function returns the value
+corresponding to the given PROP, or DEFAULT if PROP is not one of the
+properties on the list.
+*/ )
+(lax_plist, prop, defalt)           /* Cant spel in C */
+Lisp_Object lax_plist, prop, defalt;
+{
+Lisp_Object val = external_plist_get (&lax_plist, prop, 1, ERROR_ME);
+if (UNBOUNDP (val))
+return defalt;
+return val;
+}
+DEFUN ("lax-plist-put", Flax_plist_put, Slax_plist_put, 3, 3, 0 /*
+Change value in LAX-PLIST of PROP to VAL.
+LAX-PLIST is a lax property list, which is a list of the form \(PROP1
+VALUE1 PROP2 VALUE2...), where comparions between properties is done
+using `equal' instead of `eq'.  PROP is usually a symbol and VAL is
+any object.  If PROP is already a property on the list, its value is
+set to VAL, otherwise the new PROP VAL pair is added.  The new plist
+is returned; use `(setq x (lax-plist-put x prop val))' to be sure to
+use the new value.  The LAX-PLIST is modified by side effects.
+*/ )
+(lax_plist, prop, val)
+Lisp_Object lax_plist, prop, val;
+{
+external_plist_put (&lax_plist, prop, val, 1, ERROR_ME);
+return lax_plist;
+}
+DEFUN ("lax-plist-remprop", Flax_plist_remprop, Slax_plist_remprop, 2, 2, 0 /*
+Remove from LAX-PLIST the property PROP and its value.
+LAX-PLIST is a lax property list, which is a list of the form \(PROP1
+VALUE1 PROP2 VALUE2...), where comparions between properties is done
+using `equal' instead of `eq'.  PROP is usually a symbol.  The new
+plist is returned; use `(setq x (lax-plist-remprop x prop val))' to be
+sure to use the new value.  The LAX-PLIST is modified by side effects.
+*/ )
+(lax_plist, prop)
+Lisp_Object lax_plist, prop;
+{
+external_remprop (&lax_plist, prop, 1, ERROR_ME);
+return lax_plist;
+}
+DEFUN ("lax-plist-member", Flax_plist_member, Slax_plist_member, 2, 2, 0 /*
+Return t if PROP has a value specified in LAX-PLIST.
+LAX-PLIST is a lax property list, which is a list of the form \(PROP1
+VALUE1 PROP2 VALUE2...), where comparions between properties is done
+using `equal' instead of `eq'.
+*/ )
+(lax_plist, prop)
+Lisp_Object lax_plist, prop;
+{
+return UNBOUNDP (Flax_plist_get (lax_plist, prop, Qunbound)) ? Qnil : Qt;
+}
+DEFUN ("canonicalize-lax-plist", Fcanonicalize_lax_plist,
+Scanonicalize_lax_plist, 1, 2, 0 /*
+Destructively remove any duplicate entries from a lax plist.
+In such cases, the first entry applies.
+If optional arg NIL-MEANS-NOT-PRESENT is non-nil, then a property with
+a nil value is removed.  This feature is a virus that has infected
+old Lisp implementations (and thus E-Lisp, due to RMS's enamorment with
+old Lisps), but should not be used except for backward compatibility.
+The new plist is returned.  If NIL-MEANS-NOT-PRESENT is given, the
+return value may not be EQ to the passed-in value, so make sure to
+`setq' the value back into where it came from.
+*/ )
+(lax_plist, nil_means_not_present)
+Lisp_Object lax_plist, nil_means_not_present;
+{
+Lisp_Object head = lax_plist;
+Fcheck_valid_plist (lax_plist);
+while (!NILP (lax_plist))
+{
+Lisp_Object prop = Fcar (lax_plist);
+Lisp_Object next = Fcdr (lax_plist);
+CHECK_CONS (next); /* just make doubly sure we catch any errors */
+if (!NILP (nil_means_not_present) && NILP (Fcar (next)))
+	{
+	  if (EQ (head, lax_plist))
+	    head = Fcdr (next);
+	  lax_plist = Fcdr (next);
+	  continue;
+	}
+/* external_remprop returns 1 if it removed any property.
+	 We have to loop till it didn't remove anything, in case
+	 the property occurs many times. */
+while (external_remprop (&XCDR (next), prop, 1, ERROR_ME));
+lax_plist = Fcdr (next);
+}
+return head;
+}
+/* In C because the frame props stuff uses it */
+DEFUN ("destructive-alist-to-plist", Fdestructive_alist_to_plist,
+Sdestructive_alist_to_plist, 1, 1, 0 /*
+Convert association list ALIST into the equivalent property-list form.
+The plist is returned.  This converts from
+\((a . 1) (b . 2) (c . 3))
+into
+\(a 1 b 2 c 3)
+The original alist is destroyed in the process of constructing the plist.
+See also `alist-to-plist'.
+*/ )
+(alist)
+Lisp_Object alist;
+{
+Lisp_Object head = alist;
+while (!NILP (alist))
+{
+/* remember the alist element. */
+Lisp_Object el = Fcar (alist);
+Fsetcar (alist, Fcar (el));
+Fsetcar (el, Fcdr (el));
+Fsetcdr (el, Fcdr (alist));
+Fsetcdr (alist, el);
+alist = Fcdr (Fcdr (alist));
+}
+return head;
+}
+/* Symbol plists are directly accessible, so we need to protect against
+invalid property list structure */
+static Lisp_Object
+symbol_getprop (Lisp_Object sym, Lisp_Object propname, Lisp_Object defalt)
+{
+Lisp_Object val = external_plist_get (&XSYMBOL (sym)->plist, propname,
+					0, ERROR_ME);
+if (UNBOUNDP (val))
+return defalt;
+return val;
+}
+static void
+symbol_putprop (Lisp_Object sym, Lisp_Object propname, Lisp_Object value)
+{
+external_plist_put (&XSYMBOL (sym)->plist, propname, value, 0, ERROR_ME);
+}
+static int
+symbol_remprop (Lisp_Object symbol, Lisp_Object propname)
+{
+return external_remprop (&XSYMBOL (symbol)->plist, propname, 0, ERROR_ME);
+}
+/* We store the string's extent info as the first element of the string's
+property list; and the string's MODIFF as the first or second element
+of the string's property list (depending on whether the extent info
+is present), but only if the string has been modified.  This is ugly
+but it reduces the memory allocated for the string in the vast
+majority of cases, where the string is never modified and has no
+extent info. */
+static Lisp_Object *
+string_plist_ptr (struct Lisp_String *s)
+{
+Lisp_Object *ptr = &s->plist;
+if (CONSP (*ptr) && EXTENT_INFOP (XCAR (*ptr)))
+ptr = &XCDR (*ptr);
+if (CONSP (*ptr) && INTP (XCAR (*ptr)))
+ptr = &XCDR (*ptr);
+return ptr;
+}
+Lisp_Object
+string_getprop (struct Lisp_String *s, Lisp_Object property,
+		Lisp_Object defalt)
+{
+Lisp_Object val = external_plist_get (string_plist_ptr (s), property, 0,
+					ERROR_ME);
+if (UNBOUNDP (val))
+return defalt;
+return val;
+}
+void
+string_putprop (struct Lisp_String *s, Lisp_Object property,
+		Lisp_Object value)
+{
+external_plist_put (string_plist_ptr (s), property, value, 0, ERROR_ME);
+}
+static int
+string_remprop (struct Lisp_String *s, Lisp_Object property)
+{
+return external_remprop (string_plist_ptr (s), property, 0, ERROR_ME);
+}
+static Lisp_Object
+string_plist (struct Lisp_String *s)
+{
+return *string_plist_ptr (s);
+}
+DEFUN ("get", Fget, Sget, 2, 3, 0 /*
+Return the value of OBJECT's PROPNAME property.
+This is the last VALUE stored with `(put OBJECT PROPNAME VALUE)'.
+If there is no such property, return optional third arg DEFAULT
+(which defaults to `nil').  OBJECT can be a symbol, face, extent,
+or string.  See also `put', `remprop', and `object-plist'.
+*/ )
+(object, propname, defalt)           /* Cant spel in C */
+Lisp_Object object, propname, defalt;
+{
+Lisp_Object val;
+/* Various places in emacs call Fget() and expect it not to quit,
+so don't quit. */
+/* It's easiest to treat symbols specially because they may not
+be an lrecord */
+if (SYMBOLP (object))
+val = symbol_getprop (object, propname, defalt);
+else if (STRINGP (object))
+val = string_getprop (XSTRING (object), propname, defalt);
+else if (LRECORDP (object))
+{
+CONST struct lrecord_implementation
+	*imp = XRECORD_LHEADER (object)->implementation;
+if (imp->getprop)
+	{
+	  val = (imp->getprop) (object, propname);
+	  if (UNBOUNDP (val))
+	    val = defalt;
+	}
+else
+	goto noprops;
+}
+else
+{
+noprops:
+signal_simple_error ("Object type has no properties", object);
+}
+return val;
+}
+DEFUN ("put", Fput, Sput, 3, 3, 0 /*
+Store OBJECT's PROPNAME property with value VALUE.
+It can be retrieved with `(get OBJECT PROPNAME)'.  OBJECT can be a
+symbol, face, extent, or string.
+For a string, no properties currently have predefined meanings.
+For the predefined properties for extents, see `set-extent-property'.
+For the predefined properties for faces, see `set-face-property'.
+See also `get', `remprop', and `object-plist'.
+*/ )
+(object, propname, value)
+Lisp_Object object;
+Lisp_Object propname;
+Lisp_Object value;
+{
+CHECK_SYMBOL (propname);
+CHECK_IMPURE (object);
+if (SYMBOLP (object))
+symbol_putprop (object, propname, value);
+else if (STRINGP (object))
+string_putprop (XSTRING (object), propname, value);
+else if (LRECORDP (object))
+{
+CONST struct lrecord_implementation
+	*imp = XRECORD_LHEADER (object)->implementation;
+if (imp->putprop)
+	{
+	  if (! (imp->putprop) (object, propname, value))
+	    signal_simple_error ("Can't set property on object", propname);
+	}
+else
+	goto noprops;
+}
+else
+{
+noprops:
+signal_simple_error ("Object type has no settable properties", object);
+}
+return value;
+}
+void
+pure_put (Lisp_Object sym, Lisp_Object prop, Lisp_Object val)
+{
+Fput (sym, prop, Fpurecopy (val));
+}
+DEFUN ("remprop", Fremprop, Sremprop, 2, 2, 0 /*
+Remove from OBJECT's property list the property PROPNAME and its
+value.  OBJECT can be a symbol, face, extent, or string.  Returns
+non-nil if the property list was actually changed (i.e. if PROPNAME
+was present in the property list).  See also `get', `put', and
+`object-plist'.
+*/ )
+(object, propname)
+Lisp_Object object, propname;
+{
+int retval = 0;
+CHECK_SYMBOL (propname);
+CHECK_IMPURE (object);
+if (SYMBOLP (object))
+retval = symbol_remprop (object, propname);
+else if (STRINGP (object))
+retval = string_remprop (XSTRING (object), propname);
+else if (LRECORDP (object))
+{
+CONST struct lrecord_implementation
+	*imp = XRECORD_LHEADER (object)->implementation;
+if (imp->remprop)
+	{
+	  retval = (imp->remprop) (object, propname);
+	  if (retval == -1)
+	    signal_simple_error ("Can't remove property from object",
+				 propname);
+	}
+else
+	goto noprops;
+}
+else
+{
+noprops:
+signal_simple_error ("Object type has no removable properties", object);
+}
+return retval ? Qt : Qnil;
+}
+DEFUN ("object-plist", Fobject_plist, Sobject_plist, 1, 1, 0 /*
+Return a property list of OBJECT's props.
+For a symbol this is equivalent to `symbol-plist'.
+Do not modify the property list directly; this may or may not have
+the desired effects. (In particular, for a property with a special
+interpretation, this will probably have no effect at all.)
+*/ )
+(object)
+Lisp_Object object;
+{
+if (SYMBOLP (object))
+return Fsymbol_plist (object);
+else if (STRINGP (object))
+return string_plist (XSTRING (object));
+else if (LRECORDP (object))
+{
+CONST struct lrecord_implementation
+	*imp = XRECORD_LHEADER (object)->implementation;
+if (imp->plist)
+	return (imp->plist) (object);
+else
+	signal_simple_error ("Object type has no properties", object);
+}
+else
+signal_simple_error ("Object type has no properties", object);
+return Qnil;
+}
+int
+internal_equal (Lisp_Object o1, Lisp_Object o2, int depth)
+{
+if (depth > 200)
+error ("Stack overflow in equal");
+do_cdr:
+QUIT;
+if (HACKEQ_UNSAFE (o1, o2))
+return (1);
+/* Note that (equal 20 20.0) should be nil */
+else if (XTYPE (o1) != XTYPE (o2))
+return (0);
+else if (CONSP (o1))
+{
+if (!internal_equal (Fcar (o1), Fcar (o2), depth + 1))
+return (0);
+o1 = Fcdr (o1);
+o2 = Fcdr (o2);
+goto do_cdr;
+}
+#ifndef LRECORD_VECTOR
+else if (VECTORP (o1))
+{
+int indecks;
+int len = vector_length (XVECTOR (o1));
+if (len != vector_length (XVECTOR (o2)))
+	return (0);
+for (indecks = 0; indecks < len; indecks++)
+	{
+	  Lisp_Object v1, v2;
+	  v1 = vector_data (XVECTOR (o1)) [indecks];
+	  v2 = vector_data (XVECTOR (o2)) [indecks];
+	  if (!internal_equal (v1, v2, depth + 1))
+return (0);
+	}
+return (1);
+}
+#endif /* !LRECORD_VECTOR */
+else if (STRINGP (o1))
+{
+Bytecount len = string_length (XSTRING (o1));
+if (len != string_length (XSTRING (o2)))
+	return (0);
+if (memcmp (string_data (XSTRING (o1)), string_data (XSTRING (o2)), len))
+	return (0);
+return (1);
+}
+else if (LRECORDP (o1))
+{
+CONST struct lrecord_implementation
+	*imp1 = XRECORD_LHEADER (o1)->implementation,
+	*imp2 = XRECORD_LHEADER (o2)->implementation;
+if (imp1 != imp2)
+	return (0);
+else if (imp1->equal == 0)
+	/* EQ-ness of the objects was noticed above */
+	return (0);
+else
+	return ((imp1->equal) (o1, o2, depth));
+}
+return (0);
+}
+DEFUN ("equal", Fequal, Sequal, 2, 2, 0 /*
+T if two Lisp objects have similar structure and contents.
+They must have the same data type.
+Conses are compared by comparing the cars and the cdrs.
+Vectors and strings are compared element by element.
+Numbers are compared by value.  Symbols must match exactly.
+*/ )
+(o1, o2)
+Lisp_Object o1, o2;
+{
+return ((internal_equal (o1, o2, 0)) ? Qt : Qnil);
+}
+DEFUN ("fillarray", Ffillarray, Sfillarray, 2, 2, 0 /*
+Store each element of ARRAY with ITEM.
+ARRAY is a vector, bit vector, or string.
+*/ )
+(array, item)
+Lisp_Object array, item;
+{
+retry:
+if (VECTORP (array))
+{
+Lisp_Object *p;
+int size;
+int indecks;
+CHECK_IMPURE (array);
+size = vector_length (XVECTOR (array));
+p = vector_data (XVECTOR (array));
+for (indecks = 0; indecks < size; indecks++)
+	p[indecks] = item;
+}
+else if (VECTORP (array))
+{
+struct Lisp_Bit_Vector *v;
+int size;
+int indecks;
+CHECK_BIT (item);
+CHECK_IMPURE (array);
+v = XBIT_VECTOR (array);
+size = bit_vector_length (v);
+for (indecks = 0; indecks < size; indecks++)
+	set_bit_vector_bit (v, indecks, XINT (item));
+}
+else if (STRINGP (array))
+{
+Charcount size;
+Charcount indecks;
+Emchar charval;
+CHECK_CHAR_COERCE_INT (item);
+CHECK_IMPURE (array);
+charval = XCHAR (item);
+size = string_char_length (XSTRING (array));
+for (indecks = 0; indecks < size; indecks++)
+	set_string_char (XSTRING (array), indecks, charval);
+bump_string_modiff (array);
+}
+else
+{
+array = wrong_type_argument (Qarrayp, array);
+goto retry;
+}
+return array;
+}
+Lisp_Object
+nconc2 (Lisp_Object s1, Lisp_Object s2)
+{
+Lisp_Object args[2];
+args[0] = s1;
+args[1] = s2;
+return Fnconc (2, args);
+}
+DEFUN ("nconc", Fnconc, Snconc, 0, MANY, 0 /*
+Concatenate any number of lists by altering them.
+Only the last argument is not altered, and need not be a list.
+*/ )
+(nargs, args)
+int nargs;
+Lisp_Object *args;
+{
+int argnum;
+Lisp_Object tail, tem, val;
+struct gcpro gcpro1;
+/* The modus operandi in Emacs is "caller gc-protects args".
+However, nconc (particularly nconc2 ()) is called many times
+in Emacs on freshly created stuff (e.g. you see the idiom
+nconc2 (Fcopy_sequence (foo), bar) a lot).  So we help those
+callers out by protecting the args ourselves to save them
+a lot of temporary-variable grief. */
+GCPRO1 (args[0]);
+gcpro1.nvars = nargs;
+val = Qnil;
+for (argnum = 0; argnum < nargs; argnum++)
+{
+tem = args[argnum];
+if (NILP (tem)) continue;
+if (NILP (val))
+	val = tem;
+if (argnum + 1 == nargs) break;
+if (!CONSP (tem))
+	tem = wrong_type_argument (Qlistp, tem);
+while (CONSP (tem))
+	{
+	  tail = tem;
+	  tem = Fcdr (tail);
+	  QUIT;
+	}
+tem = args[argnum + 1];
+Fsetcdr (tail, tem);
+if (NILP (tem))
+	args[argnum + 1] = tail;
+}
+RETURN_UNGCPRO (val);
+}
+/* This is the guts of all mapping functions.
+Apply fn to each element of seq, one by one,
+storing the results into elements of vals, a C vector of Lisp_Objects.
+leni is the length of vals, which should also be the length of seq.
+If VALS is a null pointer, do not accumulate the results. */
+static void
+mapcar1 (int leni, Lisp_Object *vals, Lisp_Object fn, Lisp_Object seq)
+{
+Lisp_Object tail;
+Lisp_Object dummy = Qnil;
+int i;
+struct gcpro gcpro1, gcpro2, gcpro3;
+Lisp_Object result;
+GCPRO3 (dummy, fn, seq);
+if (vals)
+{
+/* Don't let vals contain any garbage when GC happens.  */
+for (i = 0; i < leni; i++)
+	vals[i] = Qnil;
+gcpro1.var = vals;
+gcpro1.nvars = leni;
+}
+/* We need not explicitly protect `tail' because it is used only on
+lists, and 1) lists are not relocated and 2) the list is marked
+via `seq' so will not be freed */
+if (VECTORP (seq))
+{
+for (i = 0; i < leni; i++)
+	{
+	  dummy = vector_data (XVECTOR (seq))[i];
+	  result = call1 (fn, dummy);
+	  if (vals)
+	    vals[i] = result;
+	}
+}
+else if (BIT_VECTORP (seq))
+{
+struct Lisp_Bit_Vector *v = XBIT_VECTOR (seq);
+for (i = 0; i < leni; i++)
+	{
+	  XSETINT (dummy, bit_vector_bit (v, i));
+	  result = call1 (fn, dummy);
+	  if (vals)
+	    vals[i] = result;
+	}
+}
+else if (STRINGP (seq))
+{
+for (i = 0; i < leni; i++)
+	{
+	  result = call1 (fn, make_char (string_char (XSTRING (seq), i)));
+	  if (vals)
+	    vals[i] = result;
+	}
+}
+else   /* Must be a list, since Flength did not get an error */
+{
+tail = seq;
+for (i = 0; i < leni; i++)
+	{
+	  result = call1 (fn, Fcar (tail));
+	  if (vals)
+	    vals[i] = result;
+	  tail = Fcdr (tail);
+	}
+}
+UNGCPRO;
+}
+DEFUN ("mapconcat", Fmapconcat, Smapconcat, 3, 3, 0 /*
+Apply FN to each element of SEQ, and concat the results as strings.
+In between each pair of results, stick in SEP.
+Thus, \" \" as SEP results in spaces between the values returned by FN.
+*/ )
+(fn, seq, sep)
+Lisp_Object fn, seq, sep;
+{
+Lisp_Object len;
+int leni;
+int nargs;
+Lisp_Object *args;
+int i;
+struct gcpro gcpro1;
+len = Flength (seq);
+leni = XINT (len);
+nargs = leni + leni - 1;
+if (nargs < 0) return build_string ("");
+args = (Lisp_Object *) alloca (nargs * sizeof (Lisp_Object));
+GCPRO1 (sep);
+mapcar1 (leni, args, fn, seq);
+UNGCPRO;
+for (i = leni - 1; i >= 0; i--)
+args[i + i] = args[i];
+for (i = 1; i < nargs; i += 2)
+args[i] = sep;
+return Fconcat (nargs, args);
+}
+DEFUN ("mapcar", Fmapcar, Smapcar, 2, 2, 0 /*
+Apply FUNCTION to each element of SEQUENCE, and make a list of the results.
+The result is a list just as long as SEQUENCE.
+SEQUENCE may be a list, a vector, a bit vector, or a string.
+*/ )
+(fn, seq)
+Lisp_Object fn, seq;
+{
+Lisp_Object len;
+int leni;
+Lisp_Object *args;
+len = Flength (seq);
+leni = XINT (len);
+args = (Lisp_Object *) alloca (leni * sizeof (Lisp_Object));
+mapcar1 (leni, args, fn, seq);
+return Flist (leni, args);
+}
+DEFUN ("mapc-internal", Fmapc_internal, Smapc_internal, 2, 2, 0 /*
+Apply FUNCTION to each element of SEQUENCE.
+SEQUENCE may be a list, a vector, a bit vector, or a string.
+This function is like `mapcar' but does not accumulate the results,
+which is more efficient if you do not use the results.
+*/ )
+(fn, seq)
+Lisp_Object fn, seq;
+{
+Lisp_Object len;
+int leni;
+len = Flength (seq);
+leni = XINT (len);
+mapcar1 (leni, 0, fn, seq);
+return Qnil;
+}
+/* #### this function doesn't belong in this file! */
+DEFUN ("load-average", Fload_average, Sload_average, 0, 0, 0 /*
+Return list of 1 minute, 5 minute and 15 minute load averages.
+Each of the three load averages is multiplied by 100,
+then converted to integer.
+If the 5-minute or 15-minute load averages are not available, return a
+shortened list, containing only those averages which are available.
+On most systems, this won't work unless the emacs executable is installed
+as setgid kmem (assuming that /dev/kmem is in the group kmem).
+*/ )
+()
+{
+double load_ave[10]; /* hey, just in case */
+int loads = getloadavg (load_ave, 3);
+Lisp_Object ret;
+if (loads == -2)
+error ("load-average not implemented for this operating system.");
+else if (loads < 0)
+error ("could not get load-average; check permissions.");
+ret = Qnil;
+while (loads > 0)
+ret = Fcons (make_int ((int) (load_ave[--loads] * 100.0)), ret);
+return ret;
+}
+Lisp_Object Vfeatures;
+DEFUN ("featurep", Ffeaturep, Sfeaturep, 1, 1, 0 /*
+Return t if FEATURE is present in this Emacs.
+Use this to conditionalize execution of lisp code based on the presence or
+absence of emacs or environment extensions.
+Use `provide' to declare that a feature is available.
+This function looks at the value of the variable `features'.
+*/ )
+(feature)
+Lisp_Object feature;
+{
+Lisp_Object tem;
+CHECK_SYMBOL (feature);
+tem = Fmemq (feature, Vfeatures);
+return (NILP (tem)) ? Qnil : Qt;
+}
+DEFUN ("provide", Fprovide, Sprovide, 1, 1, 0 /*
+Announce that FEATURE is a feature of the current Emacs.
+*/ )
+(feature)
+Lisp_Object feature;
+{
+Lisp_Object tem;
+CHECK_SYMBOL (feature);
+if (!NILP (Vautoload_queue))
+Vautoload_queue = Fcons (Fcons (Vfeatures, Qnil), Vautoload_queue);
+tem = Fmemq (feature, Vfeatures);
+if (NILP (tem))
+Vfeatures = Fcons (feature, Vfeatures);
+LOADHIST_ATTACH (Fcons (Qprovide, feature));
+return feature;
+}
+DEFUN ("require", Frequire, Srequire, 1, 2, 0 /*
+If feature FEATURE is not loaded, load it from FILENAME.
+If FEATURE is not a member of the list `features', then the feature
+is not loaded; so load the file FILENAME.
+If FILENAME is omitted, the printname of FEATURE is used as the file name.
+*/ )
+(feature, file_name)
+Lisp_Object feature, file_name;
+{
+Lisp_Object tem;
+CHECK_SYMBOL (feature);
+tem = Fmemq (feature, Vfeatures);
+LOADHIST_ATTACH (Fcons (Qrequire, feature));
+if (!NILP (tem))
+return (feature);
+else
+{
+int speccount = specpdl_depth ();
+/* Value saved here is to be restored into Vautoload_queue */
+record_unwind_protect (un_autoload, Vautoload_queue);
+Vautoload_queue = Qt;
+call4 (Qload, NILP (file_name) ? Fsymbol_name (feature) : file_name,
+	     Qnil, Qt, Qnil);
+tem = Fmemq (feature, Vfeatures);
+if (NILP (tem))
+	error ("Required feature %s was not provided",
+	       string_data (XSYMBOL (feature)->name));
+/* Once loading finishes, don't undo it.  */
+Vautoload_queue = Qt;
+return (unbind_to (speccount, feature));
+}
+}
+Lisp_Object Qyes_or_no_p;
+void
+syms_of_fns (void)
+{
+defsymbol (&Qstring_lessp, "string-lessp");
+defsymbol (&Qidentity, "identity");
+defsymbol (&Qyes_or_no_p, "yes-or-no-p");
+defsubr (&Sidentity);
+defsubr (&Srandom);
+defsubr (&Slength);
+defsubr (&Ssafe_length);
+defsubr (&Sstring_equal);
+defsubr (&Sstring_lessp);
+defsubr (&Sstring_modified_tick);
+defsubr (&Sappend);
+defsubr (&Sconcat);
+defsubr (&Svconcat);
+defsubr (&Sbvconcat);
+defsubr (&Scopy_sequence);
+defsubr (&Scopy_alist);
+defsubr (&Scopy_tree);
+defsubr (&Ssubstring);
+defsubr (&Ssubseq);
+defsubr (&Snthcdr);
+defsubr (&Snth);
+defsubr (&Selt);
+defsubr (&Smember);
+defsubr (&Smemq);
+defsubr (&Sassoc);
+defsubr (&Sassq);
+defsubr (&Srassoc);
+defsubr (&Srassq);
+defsubr (&Sdelete);
+defsubr (&Sdelq);
+defsubr (&Sremassoc);
+defsubr (&Sremassq);
+defsubr (&Sremrassoc);
+defsubr (&Sremrassq);
+defsubr (&Snreverse);
+defsubr (&Sreverse);
+defsubr (&Ssort);
+defsubr (&Splists_eq);
+defsubr (&Splists_equal);
+defsubr (&Slax_plists_eq);
+defsubr (&Slax_plists_equal);
+defsubr (&Splist_get);
+defsubr (&Splist_put);
+defsubr (&Splist_remprop);
+defsubr (&Splist_member);
+defsubr (&Scheck_valid_plist);
+defsubr (&Svalid_plist_p);
+defsubr (&Scanonicalize_plist);
+defsubr (&Slax_plist_get);
+defsubr (&Slax_plist_put);
+defsubr (&Slax_plist_remprop);
+defsubr (&Slax_plist_member);
+defsubr (&Scanonicalize_lax_plist);
+defsubr (&Sdestructive_alist_to_plist);
+defsubr (&Sget);
+defsubr (&Sput);
+defsubr (&Sremprop);
+defsubr (&Sobject_plist);
+defsubr (&Sequal);
+defsubr (&Sfillarray);
+defsubr (&Snconc);
+defsubr (&Smapcar);
+defsubr (&Smapc_internal);
+defsubr (&Smapconcat);
+defsubr (&Sload_average);
+defsubr (&Sfeaturep);
+defsubr (&Srequire);
+defsubr (&Sprovide);
+}
+void
+init_provide_once (void)
+{
+DEFVAR_LISP ("features", &Vfeatures /*
+A list of symbols which are the features of the executing emacs.
+Used by `featurep' and `require', and altered by `provide'.
+*/ );
+Vfeatures = Qnil;
+}

Mercurial > hg > xemacs-beta

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