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-rw-r--r--lib/isc/parseint.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/lib/isc/parseint.c b/lib/isc/parseint.c
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--- /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);
+}