1 files changed, 79 insertions, 0 deletions
diff --git a/lib/isc/parseint.c b/lib/isc/parseint.c
new file mode 100644
index 0000000..da6c281
--- /dev/null
+++ b/lib/isc/parseint.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <ctype.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdlib.h>
+
+#include <isc/parseint.h>
+#include <isc/result.h>
+
+isc_result_t
+isc_parse_uint32(uint32_t *uip, const char *string, int base) {
+	unsigned long n;
+	uint32_t r;
+	char *e;
+	if (!isalnum((unsigned char)(string[0]))) {
+		return (ISC_R_BADNUMBER);
+	}
+	errno = 0;
+	n = strtoul(string, &e, base);
+	if (*e != '\0') {
+		return (ISC_R_BADNUMBER);
+	}
+	/*
+	 * Where long is 64 bits we need to convert to 32 bits then test for
+	 * equality.  This is a no-op on 32 bit machines and a good compiler
+	 * will optimise it away.
+	 */
+	r = (uint32_t)n;
+	if ((n == ULONG_MAX && errno == ERANGE) || (n != (unsigned long)r)) {
+		return (ISC_R_RANGE);
+	}
+	*uip = r;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_parse_uint16(uint16_t *uip, const char *string, int base) {
+	uint32_t val;
+	isc_result_t result;
+	result = isc_parse_uint32(&val, string, base);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+	if (val > 0xFFFF) {
+		return (ISC_R_RANGE);
+	}
+	*uip = (uint16_t)val;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_parse_uint8(uint8_t *uip, const char *string, int base) {
+	uint32_t val;
+	isc_result_t result;
+	result = isc_parse_uint32(&val, string, base);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+	if (val > 0xFF) {
+		return (ISC_R_RANGE);
+	}
+	*uip = (uint8_t)val;
+	return (ISC_R_SUCCESS);
+}