1 files changed, 97 insertions, 0 deletions
diff --git a/lib/isc/include/isc/region.h b/lib/isc/include/isc/region.h
new file mode 100644
index 0000000..ee01354
--- /dev/null
+++ b/lib/isc/include/isc/region.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#ifndef ISC_REGION_H
+#define ISC_REGION_H 1
+
+/*! \file isc/region.h */
+
+#include <isc/types.h>
+#include <isc/lang.h>
+
+struct isc_region {
+	unsigned char *	base;
+	unsigned int	length;
+};
+
+struct isc_textregion {
+	char *		base;
+	unsigned int	length;
+};
+
+/* XXXDCL questionable ... bears discussion.  we have been putting off
+ * discussing the region api.
+ */
+struct isc_constregion {
+	const void *	base;
+	unsigned int	length;
+};
+
+struct isc_consttextregion {
+	const char *	base;
+	unsigned int	length;
+};
+
+/*@{*/
+/*!
+ * The region structure is not opaque, and is usually directly manipulated.
+ * Some macros are defined below for convenience.
+ */
+
+#define isc_region_consume(r,l) \
+	do { \
+		isc_region_t *_r = (r); \
+		unsigned int _l = (l); \
+		INSIST(_r->length >= _l); \
+		_r->base += _l; \
+		_r->length -= _l; \
+	} while (0)
+
+#define isc_textregion_consume(r,l) \
+	do { \
+		isc_textregion_t *_r = (r); \
+		unsigned int _l = (l); \
+		INSIST(_r->length >= _l); \
+		_r->base += _l; \
+		_r->length -= _l; \
+	} while (0)
+
+#define isc_constregion_consume(r,l) \
+	do { \
+		isc_constregion_t *_r = (r); \
+		unsigned int _l = (l); \
+		INSIST(_r->length >= _l); \
+		_r->base += _l; \
+		_r->length -= _l; \
+	} while (0)
+/*@}*/
+
+ISC_LANG_BEGINDECLS
+
+int
+isc_region_compare(isc_region_t *r1, isc_region_t *r2);
+/*%<
+ * Compares the contents of two regions
+ *
+ * Requires:
+ *\li	'r1' is a valid region
+ *\li	'r2' is a valid region
+ *
+ * Returns:
+ *\li	 < 0 if r1 is lexicographically less than r2
+ *\li	 = 0 if r1 is lexicographically identical to r2
+ *\li	 > 0 if r1 is lexicographically greater than r2
+ */
+
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_REGION_H */