From 4fd287655a72b9aea14cdac715ad5b90ed082ed2 Mon Sep 17 00:00:00 2001
From: Raghuram Subramani <raghus2247@gmail.com>
Date: Sun, 19 Jun 2022 19:47:51 +0530
Subject: add circuitpython code

---
 circuitpython/lib/re1.5/recursiveloop.c | 87 +++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 circuitpython/lib/re1.5/recursiveloop.c

(limited to 'circuitpython/lib/re1.5/recursiveloop.c')

diff --git a/circuitpython/lib/re1.5/recursiveloop.c b/circuitpython/lib/re1.5/recursiveloop.c
new file mode 100644
index 0000000..f8cb926
--- /dev/null
+++ b/circuitpython/lib/re1.5/recursiveloop.c
@@ -0,0 +1,87 @@
+// Copyright 2007-2009 Russ Cox.  All Rights Reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "re1.5.h"
+
+static int
+recursiveloop(char *pc, const char *sp, Subject *input, const char **subp, int nsubp)
+{
+	const char *old;
+	int off;
+
+	re1_5_stack_chk();
+
+	for(;;) {
+		if(inst_is_consumer(*pc)) {
+			// If we need to match a character, but there's none left, it's fail
+			if(sp >= input->end)
+				return 0;
+		}
+		switch(*pc++) {
+		case Char:
+			if(*sp != *pc++)
+				return 0;
+			MP_FALLTHROUGH
+		case Any:
+			sp++;
+			continue;
+		case Class:
+		case ClassNot:
+			if (!_re1_5_classmatch(pc, sp))
+				return 0;
+			pc += *(unsigned char*)pc * 2 + 1;
+			sp++;
+			continue;
+                case NamedClass:
+			if (!_re1_5_namedclassmatch(pc, sp))
+				return 0;
+			pc++;
+			sp++;
+			continue;
+		case Match:
+			return 1;
+		case Jmp:
+			off = (signed char)*pc++;
+			pc = pc + off;
+			continue;
+		case Split:
+			off = (signed char)*pc++;
+			if(recursiveloop(pc, sp, input, subp, nsubp))
+				return 1;
+			pc = pc + off;
+			continue;
+		case RSplit:
+			off = (signed char)*pc++;
+			if(recursiveloop(pc + off, sp, input, subp, nsubp))
+				return 1;
+			continue;
+		case Save:
+			off = (unsigned char)*pc++;
+			if(off >= nsubp) {
+				continue;
+			}
+			old = subp[off];
+			subp[off] = sp;
+			if(recursiveloop(pc, sp, input, subp, nsubp))
+				return 1;
+			subp[off] = old;
+			return 0;
+		case Bol:
+			if(sp != input->begin)
+				return 0;
+			continue;
+		case Eol:
+			if(sp != input->end)
+				return 0;
+			continue;
+		}
+		re1_5_fatal("recursiveloop");
+	}
+}
+
+int
+re1_5_recursiveloopprog(ByteProg *prog, Subject *input, const char **subp, int nsubp, int is_anchored)
+{
+	return recursiveloop(HANDLE_ANCHORED(prog->insts, is_anchored), input->begin, input, subp, nsubp);
+}
-- 
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