Ndef types: Add functions that convert a C-string into a span consumable by the API.

features/nfc/nfc/common/util.h

@@ -0,0 +1,67 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FEATURES_NFC_SOURCE_NFC_COMMON_UTIL_H_
+#define FEATURES_NFC_SOURCE_NFC_COMMON_UTIL_H_
+
+#include "platform/Span.h"
+
+namespace mbed {
+namespace nfc {
+namespace common {
+
+/**
+ * @addtogroup nfc
+ * @{
+ */
+
+/**
+ * Convert a C-string into a Span<const uint8_t>.
+ *
+ * @note The NULL charactere is not present in the resulting object.
+ *
+ * @param cstr The cstr to convert into a Span.
+ *
+ * @return A Span that views cstr but doesn't include the NULL terminator
+ * character.
+ */
+template<size_t N>
+Span<const uint8_t, N-1> span_from_cstr(const char (&cstr)[N])
+{
+    return Span<const uint8_t, N-1>((const uint8_t*)cstr, N-1);
+}
+
+/**
+ * Convert a C-string into a Span<const uint8_t>.
+ *
+ * @note The NULL charactere is not present in the resulting object.
+ *
+ * @param cstr The cstr to convert into a Span.
+ *
+ * @return A Span that views cstr but doesn't include the NULL terminator
+ * character.
+ */
+Span<const uint8_t> span_from_cstr(const char *cstr);
+
+/**
+ * @}
+ */
+
+} // namespace common
+} // namespace nfc
+} // namespace mbed
+
+#endif /* FEATURES_NFC_SOURCE_NFC_COMMON_UTIL_H_ */

features/nfc/source/nfc/common/util.cpp

@@ -0,0 +1,37 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2018 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "nfc/common/util.h"
+
+#include <cstring>
+
+namespace mbed {
+namespace nfc {
+namespace common {
+
+Span<const uint8_t> span_from_cstr(const char *cstr)
+{
+    return Span<const uint8_t>((const uint8_t*)cstr, strlen(cstr));
+}
+
+/**
+ * @}
+ */
+
+} // namespace common
+} // namespace nfc
+} // namespace mbed
+