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+/* 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");
+}