1 files changed, 120 insertions, 0 deletions
diff --git a/src/contrib/strtonum.h b/src/contrib/strtonum.h
new file mode 100644
index 0000000..6cfe8bb
--- /dev/null
+++ b/src/contrib/strtonum.h
@@ -0,0 +1,120 @@
+/*  Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    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 3 of the License, 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 program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+#include <assert.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "libknot/errcode.h"
+#include "contrib/ctype.h"
+
+inline static int intmax_from_str(const char *src, intmax_t *dst,
+                                  intmax_t min, intmax_t max)
+{
+	if (!is_digit(*src) && *src != '-' && *src != '+') {
+		return KNOT_EINVAL;
+	}
+
+	errno = 0;
+	char *end = NULL;
+	intmax_t result = strtoimax(src, &end, 10);
+
+	if (errno == ERANGE) {
+		return KNOT_ERANGE;
+	}
+
+	if (src == end || *end != '\0') {
+		return KNOT_EINVAL;
+	}
+
+	if (result < min || result > max) {
+		return KNOT_ERANGE;
+	}
+
+	*dst = result;
+	return KNOT_EOK;
+}
+
+inline static int uintmax_from_str(const char *src, uintmax_t *dst,
+                                   uintmax_t min, uintmax_t max)
+{
+	if (!is_digit(*src) && *src != '+') {
+		return KNOT_EINVAL;
+	}
+
+	errno = 0;
+	char *end = NULL;
+	uintmax_t result = strtoumax(src, &end, 10);
+
+	if (errno == ERANGE) {
+		return KNOT_ERANGE;
+	}
+
+	if (src == end || *end != '\0') {
+		return KNOT_EINVAL;
+	}
+
+	if (result < min || result > max) {
+		return KNOT_ERANGE;
+	}
+
+	*dst = result;
+	return KNOT_EOK;
+}
+
+#define CONVERT(prefix, type, min, max, src, dst)                 \
+{                                                                 \
+	assert(src && dst);                                       \
+	prefix##max_t value;                                      \
+	int result = prefix##max_from_str(src, &value, min, max); \
+	if (result != KNOT_EOK) {                                 \
+		return result;                                    \
+	}                                                         \
+	*dst = (type)value;                                       \
+	return KNOT_EOK;                                          \
+}
+
+inline static int str_to_int(const char *src, int *dst, int min, int max)
+{
+	CONVERT(int, int, min, max, src, dst);
+}
+
+inline static int str_to_u8(const char *src, uint8_t *dst)
+{
+	CONVERT(uint, uint8_t, 0, UINT8_MAX, src, dst);
+}
+
+inline static int str_to_u16(const char *src, uint16_t *dst)
+{
+	CONVERT(uint, uint16_t, 0, UINT16_MAX, src, dst);
+}
+
+inline static int str_to_u32(const char *src, uint32_t *dst)
+{
+	CONVERT(uint, uint32_t, 0, UINT32_MAX, src, dst);
+}
+
+inline static int str_to_size(const char *src, size_t *dst, size_t min, size_t max)
+{
+	CONVERT(uint, size_t, min, max, src, dst);
+}
+
+#undef CONVERT