last inserted \0 (null characters) shouldn't be ignored (fix #328)

include/ctll/fixed_string.hpp

@@ -55,7 +55,6 @@ CTLL_EXPORT template <size_t N> struct fixed_string {
 			#ifdef CTRE_STRING_IS_UTF8
 				size_t out{0};
 				for (size_t i{0}; i < N; ++i) {
-					if ((i == (N-1)) && (input[i] == 0)) break;
 					length_value_t info = length_and_value_of_utf8_code_point(input[i]);
 					switch (info.length) {
 						case 6:
@@ -85,15 +84,13 @@ CTLL_EXPORT template <size_t N> struct fixed_string {
 			#else
 				for (size_t i{0}; i < N; ++i) {
 					content[i] = static_cast<uint8_t>(input[i]);
-					if ((i == (N-1)) && (input[i] == 0)) break;
 					real_size++;
 				}
 			#endif
 		#if __cpp_char8_t
 		} else if constexpr (std::is_same_v<T, char8_t>) {
 			size_t out{0};
 			for (size_t i{0}; i < N; ++i) {
-				if ((i == (N-1)) && (input[i] == 0)) break;
 				length_value_t info = length_and_value_of_utf8_code_point(input[i]);
 				switch (info.length) {
 					case 6:
@@ -135,15 +132,13 @@ CTLL_EXPORT template <size_t N> struct fixed_string {
 						}
 					}
 				} else {
-					if ((i == (N-1)) && (input[i] == 0)) break;
 					content[out++] = info.value;
 				}
 			}
 			real_size = out;
 		} else if constexpr (std::is_same_v<T, wchar_t> || std::is_same_v<T, char32_t>) {
 			for (size_t i{0}; i < N; ++i) {
 				content[i] = static_cast<char32_t>(input[i]);
-				if ((i == (N-1)) && (input[i] == 0)) break;
 				real_size++;
 			}
 		}

tests/string.cpp

@@ -0,0 +1,25 @@
+#include <ctll/fixed_string.hpp>
+
+template <ctll::fixed_string Str> struct helper {
+	consteval bool correct() const noexcept {
+		return Str.correct();
+	}
+	consteval size_t size() const noexcept {
+		return Str.size();
+	}
+};
+
+constexpr auto a = helper<"\0\0">{};
+
+static_assert(a.correct());
+static_assert(a.size() == 2u);
+
+constexpr auto b = helper<"\0">{};
+
+static_assert(b.correct());
+static_assert(b.size() == 1u);
+
+constexpr auto c = helper<"">{};
+
+static_assert(c.correct());
+static_assert(c.size() == 0u);