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+/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
+ *
+ * This program 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.
+ *
+ * This program 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 this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * As a special exception, the Free Software Foundation gives permission
+ * for additional uses of the text contained in its release of GUILE.
+ *
+ * The exception is that, if you link the GUILE library with other files
+ * to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the GUILE library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by the
+ * Free Software Foundation under the name GUILE. If you copy
+ * code from other Free Software Foundation releases into a copy of
+ * GUILE, as the General Public License permits, the exception does
+ * not apply to the code that you add in this way. To avoid misleading
+ * anyone as to the status of such modified files, you must delete
+ * this exception notice from them.
+ *
+ * If you write modifications of your own for GUILE, it is your choice
+ * whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice.
+ */
+
+/* "continue.h" Scheme Continuations for C.
+ Author: Aubrey Jaffer. */
+
+#ifdef vms
+# ifndef CHEAP_CONTINUATIONS
+
+ typedef int jmp_buf[17];
+ extern int setjump(jmp_buf env);
+ extern int longjump(jmp_buf env, int ret);
+
+# define setjmp setjump
+# define longjmp longjump
+# else
+# include <setjmp.h>
+# endif
+#else /* ndef vms */
+# ifdef _CRAY1
+ typedef int jmp_buf[112];
+ extern int setjump(jmp_buf env);
+ extern int longjump(jmp_buf env, int ret);
+
+# define setjmp setjump
+# define longjmp longjump
+# else /* ndef _CRAY1 */
+# include <setjmp.h>
+# endif /* ndef _CRAY1 */
+#endif /* ndef vms */
+
+/* `other' is a CONTINUATION slot for miscellaneous data of type
+ CONTINUATION_OTHER. */
+
+#ifndef CONTINUATION_OTHER
+# define CONTINUATION_OTHER int
+#endif
+
+/* If stack is not longword aligned then */
+
+/* #define SHORT_ALIGN */
+#ifdef THINK_C
+# define SHORT_ALIGN
+#endif
+#ifdef MSDOS
+# define SHORT_ALIGN
+#endif
+#ifdef atarist
+# define SHORT_ALIGN
+#endif
+
+#ifdef SHORT_ALIGN
+typedef short STACKITEM;
+#else
+typedef long STACKITEM;
+#endif
+
+struct Continuation {jmp_buf jmpbuf;
+ long thrwval;
+ long length;
+ STACKITEM *stkbse;
+ CONTINUATION_OTHER other;
+ struct Continuation *parent;
+ };
+typedef struct Continuation CONTINUATION;
+
+#ifndef P
+# ifdef USE_ANSI_PROTOTYPES
+# define P(s) s
+# else
+# define P(s) ()
+# endif
+#endif
+
+extern long thrown_value;
+long stack_size P((STACKITEM *start));
+CONTINUATION *make_root_continuation P((STACKITEM *stack_base));
+CONTINUATION *make_continuation P((CONTINUATION *parent_cont));
+void free_continuation P((CONTINUATION *cont));
+void dynthrow P((long *a));
+void grow_throw P((long *a));
+void throw_to_continuation P((CONTINUATION *cont, long val,
+ CONTINUATION *root_cont));
+
+/* how to get the local definition for malloc */
+
+#ifndef STDC_HEADERS
+# ifndef malloc
+ char *malloc P((sizet size));
+# endif
+ char *realloc P((char *ptr, sizet size));
+#endif
+
+/* PTR_LT defines how to compare two addresses (which may not be in
+ the same array). */
+
+#if defined(__TURBOC__) && !defined(__TOS__)
+# ifdef PROT386
+# define PTR_LT(x, y) (((long)(x)) < ((long)(y)))
+# else
+# define PTR_LT(x, y) ((x) < (y))
+# endif
+#else /* not __TURBOC__ */
+# ifdef nosve
+# define PTR_MASK 0xffffffffffff
+# define PTR_LT(x, y) (((int)(x)&PTR_MASK) < ((int)(y)&PTR_MASK))
+# else
+# define PTR_LT(x, y) ((x) < (y))
+# endif
+#endif
+
+#define PTR_GT(x, y) PTR_LT(y, x)
+#define PTR_LE(x, y) (!PTR_GT(x, y))
+#define PTR_GE(x, y) (!PTR_LT(x, y))
+
+/* James Clark came up with this neat one instruction fix for
+ continuations on the SPARC. It flushes the register windows so
+ that all the state of the process is contained in the stack. */
+
+#ifdef sparc
+# define FLUSH_REGISTER_WINDOWS asm("ta 3")
+#else
+# define FLUSH_REGISTER_WINDOWS /* empty */
+#endif
+
+/* If stacks grow up then */
+
+/* #define STACK_GROWS_UP */
+#ifdef hp9000s800
+# define STACK_GROWS_UP
+#endif
+#ifdef pyr
+# define STACK_GROWS_UP
+#endif
+#ifdef nosve
+# define STACK_GROWS_UP
+#endif
+#ifdef _UNICOS
+# define STACK_GROWS_UP
+#endif