From 5ca6e8e6a4e5c022a6fb5d28f30219c22c99eda8 Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Mon, 20 Feb 2017 00:05:23 -0800
Subject: Import Upstream version 4e6

---
 sc2.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 sc2.c

(limited to 'sc2.c')

diff --git a/sc2.c b/sc2.c
new file mode 100644
index 0000000..904458a
--- /dev/null
+++ b/sc2.c
@@ -0,0 +1,172 @@
+/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 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.  
+ */
+
+/* "sc2.c" R2RS and R3RS procedures not in R4RS.
+   Author: Aubrey Jaffer */
+
+#include "scm.h"
+
+static char s_last_pair[] = "last-pair";
+SCM last_pair(sx)
+     SCM sx;
+{
+  register SCM res = sx;
+  register SCM x;
+  ASSERT(NIMP(res) && CONSP(res), res, ARG1, s_last_pair);
+  while (!0) {
+    x = CDR(res);
+    if (IMP(x) || NCONSP(x)) return res;
+    res = x;
+    x = CDR(res);
+    if (IMP(x) || NCONSP(x)) return res;
+    res = x;
+    sx = CDR(sx);
+    ASSERT(x != sx, sx, ARG1, s_last_pair);
+  }
+}
+
+static char s_subml[] = "substring-move-left!";
+SCM subml(str1, start1, args)
+     SCM str1, start1, args;
+{
+  SCM end1, str2, start2;
+  long i, j, e;
+  ASSERT(3==ilength(args), args, WNA, s_subml);
+  end1 = CAR(args); args = CDR(args);
+  str2 = CAR(args); args = CDR(args);
+  start2 = CAR(args);
+  ASSERT(NIMP(str1) && STRINGP(str1), str1, ARG1, s_subml);
+  ASSERT(INUMP(start1), start1, ARG2, s_subml);
+  ASSERT(INUMP(end1), end1, ARG3, s_subml);
+  ASSERT(NIMP(str2) && STRINGP(str2), str2, ARG4, s_subml);
+  ASSERT(INUMP(start2), start2, ARG5, s_subml);
+  i = INUM(start1), j = INUM(start2), e = INUM(end1);
+  ASSERT(i <= LENGTH(str1) && i >= 0, start1, OUTOFRANGE, s_subml);
+  ASSERT(j <= LENGTH(str2) && j >= 0, start2, OUTOFRANGE, s_subml);
+  ASSERT(e <= LENGTH(str1) && e >= 0, end1, OUTOFRANGE, s_subml);
+  ASSERT(e-i+j <= LENGTH(str2), start2, OUTOFRANGE, s_subml);
+  while(i<e) CHARS(str2)[j++] = CHARS(str1)[i++];
+  return UNSPECIFIED;
+}
+static char s_submr[] = "substring-move-right!";
+SCM submr(str1, start1, args)
+     SCM str1, start1, args;
+{
+  SCM end1, str2, start2;
+  long i, j, e;
+  ASSERT(3==ilength(args), args, WNA, s_submr);
+  end1 = CAR(args); args = CDR(args);
+  str2 = CAR(args); args = CDR(args);
+  start2 = CAR(args);
+  ASSERT(NIMP(str1) && STRINGP(str1), str1, ARG1, s_submr);
+  ASSERT(INUMP(start1), start1, ARG2, s_submr);
+  ASSERT(INUMP(end1), end1, ARG3, s_submr);
+  ASSERT(NIMP(str2) && STRINGP(str2), str2, ARG4, s_submr);
+  ASSERT(INUMP(start2), start2, ARG5, s_submr);
+  i = INUM(start1), j = INUM(start2), e = INUM(end1);
+  ASSERT(i <= LENGTH(str1) && i >= 0, start1, OUTOFRANGE, s_submr);
+  ASSERT(j <= LENGTH(str2) && j >= 0, start2, OUTOFRANGE, s_submr);
+  ASSERT(e <= LENGTH(str1) && e >= 0, end1, OUTOFRANGE, s_submr);
+  ASSERT((j = e-i+j) <= LENGTH(str2), start2, OUTOFRANGE, s_submr);
+  while(i<e) CHARS(str2)[--j] = CHARS(str1)[--e];
+  return UNSPECIFIED;
+}
+static char s_subfl[] = "substring-fill!";
+SCM subfl(str, start, args)
+     SCM str, start, args;
+{
+  SCM end, fill;
+  long i, e;
+  char c;
+  ASSERT(2==ilength(args), args, WNA, s_subfl);
+  end = CAR(args); args = CDR(args);
+  fill = CAR(args);
+  ASSERT(NIMP(str) && STRINGP(str), str, ARG1, s_subfl);
+  ASSERT(INUMP(start), start, ARG2, s_subfl);
+  ASSERT(INUMP(end), end, ARG3, s_subfl);
+  ASSERT(ICHRP(fill), fill, ARG4, s_subfl);
+  i = INUM(start), e = INUM(end);c = ICHR(fill);
+  ASSERT(i <= LENGTH(str) && i >= 0, start, OUTOFRANGE, s_subfl);
+  ASSERT(e <= LENGTH(str) && e >= 0, end, OUTOFRANGE, s_subfl);
+  while(i<e) CHARS(str)[i++] = c;
+  return UNSPECIFIED;
+}
+
+static char s_strnullp[] = "string-null?";
+SCM strnullp(str)
+     SCM str;
+{
+  ASSERT(NIMP(str) && STRINGP(str), str, ARG1, s_strnullp);
+  if LENGTH(str) return BOOL_F;
+  else return BOOL_T;
+}
+
+static char s_appendb[] = "append!";
+SCM appendb(args)
+     SCM args;
+{
+  SCM arg;
+ tail:
+  if NULLP(args) return EOL;
+  arg = CAR(args);
+  ASSERT(NULLP(arg) || (NIMP(arg) && CONSP(arg)), arg, ARG1, s_appendb);
+  args = CDR(args);
+  if NULLP(args) return arg;
+  if NULLP(arg) goto tail;
+  CDR(last_pair(arg)) = appendb(args);
+  return arg;
+}
+
+static iproc lsubr2s[] = {
+  {s_subml, subml},
+  {s_submr, submr},
+  {s_subfl, subfl},
+  {0, 0}};
+
+void init_sc2()
+{
+  make_subr(s_last_pair, tc7_subr_1, last_pair);
+  make_subr(s_strnullp, tc7_subr_1, strnullp);
+  make_subr(s_appendb, tc7_lsubr, appendb);
+  init_iprocs(lsubr2s, tc7_lsubr_2);
+  add_feature("rev2-procedures");
+  add_feature("rev3-procedures");
+}
-- 
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