util/AllocatedString: std::string_view support

src/fs/Charset.cxx

@@ -99,7 +99,7 @@ PathToUTF8(PathTraitsFS::const_pointer path_fs)
 
 #ifdef _WIN32
 	const auto buffer = WideCharToMultiByte(CP_UTF8, path_fs);
-	return FixSeparators(PathTraitsUTF8::string(buffer.c_str()));
+	return FixSeparators(PathTraitsUTF8::string(buffer));
 #else
 #ifdef HAVE_FS_CHARSET
 	if (fs_converter == nullptr)
@@ -108,7 +108,7 @@ PathToUTF8(PathTraitsFS::const_pointer path_fs)
 #ifdef HAVE_FS_CHARSET
 
 	const auto buffer = fs_converter->ToUTF8(path_fs);
-	return FixSeparators(PathTraitsUTF8::string(buffer.c_str()));
+	return FixSeparators(PathTraitsUTF8::string(buffer));
 #endif
 #endif
 }
@@ -125,13 +125,13 @@ PathFromUTF8(PathTraitsUTF8::const_pointer path_utf8)
 
 #ifdef _WIN32
 	const auto buffer = MultiByteToWideChar(CP_UTF8, path_utf8);
-	return PathTraitsFS::string(buffer.c_str());
+	return PathTraitsFS::string(buffer);
 #else
 	if (fs_converter == nullptr)
 		return path_utf8;
 
 	const auto buffer = fs_converter->FromUTF8(path_utf8);
-	return PathTraitsFS::string(buffer.c_str());
+	return PathTraitsFS::string(buffer);
 #endif
 }
 

src/lib/icu/Compare.hxx

@@ -38,12 +38,12 @@ public:
 
 	IcuCompare(const IcuCompare &src) noexcept
 		:needle(src
-			? AllocatedString<>::Duplicate(src.needle.c_str())
+			? AllocatedString<>::Duplicate(src.needle)
 			: nullptr) {}
 
 	IcuCompare &operator=(const IcuCompare &src) noexcept {
 		needle = src
-			? AllocatedString<>::Duplicate(src.needle.c_str())
+			? AllocatedString<>::Duplicate(src.needle)
 			: nullptr;
 		return *this;
 	}

src/lib/icu/Converter.cxx

@@ -95,7 +95,7 @@ DoConvert(iconv_t conv, const char *src)
 	if (in_left > 0)
 		throw std::runtime_error("Charset conversion failed");
 
-	return AllocatedString<>::Duplicate(buffer, sizeof(buffer) - out_left);
+	return AllocatedString<>::Duplicate({buffer, sizeof(buffer) - out_left});
 }
 
 #endif
@@ -151,7 +151,7 @@ IcuConverter::FromUTF8(const char *s) const
 		throw std::runtime_error(FormatString("Failed to convert from Unicode: %s",
 						      u_errorName(code)).c_str());
 
-	return AllocatedString<>::Duplicate(buffer, target);
+	return AllocatedString<>::Duplicate({buffer, size_t(target - buffer)});
 
 #elif defined(HAVE_ICONV)
 	return DoConvert(from_utf8, s);

src/util/AllocatedString.cxx

-/*
- * Copyright (C) 2015 Max Kellermann <max.kellermann@gmail.com>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
- * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "AllocatedString.hxx"
-#include "StringAPI.hxx"
-
-template<>
-AllocatedString<char>
-AllocatedString<char>::Duplicate(const_pointer src)
-{
-	return Duplicate(src, StringLength(src));
-}
-
-#ifdef _UNICODE
-
-template<>
-AllocatedString<wchar_t>
-AllocatedString<wchar_t>::Duplicate(const_pointer src)
-{
-	return Duplicate(src, StringLength(src));
-}
-
-#endif

src/util/AllocatedString.hxx

@@ -34,6 +34,7 @@
 
 #include <algorithm>
 #include <cstddef>
+#include <string_view>
 
 /**
  * A string pointer whose memory is managed by this class.
@@ -48,6 +49,7 @@ public:
 	using const_reference = typename StringPointer<T>::const_reference;
 	using pointer = typename StringPointer<T>::pointer;
 	using const_pointer = typename StringPointer<T>::const_pointer;
+	using string_view = std::basic_string_view<T>;
 	using size_type = std::size_t;
 
 	static constexpr value_type SENTINEL = '\0';
@@ -83,19 +85,9 @@ public:
 		return Donate(p);
 	}
 
-	static AllocatedString Duplicate(const_pointer src);
-
-	static AllocatedString Duplicate(const_pointer begin,
-					 const_pointer end) {
-		auto p = new value_type[end - begin + 1];
-		*std::copy(begin, end, p) = SENTINEL;
-		return Donate(p);
-	}
-
-	static AllocatedString Duplicate(const_pointer begin,
-					 size_type length) {
-		auto p = new value_type[length + 1];
-		*std::copy_n(begin, length, p) = SENTINEL;
+	static AllocatedString Duplicate(string_view src) {
+		auto p = new value_type[src.size() + 1];
+		*std::copy_n(src.data(), src.size(), p) = SENTINEL;
 		return Donate(p);
 	}
 
@@ -116,6 +108,10 @@ public:
 		return value == nullptr;
 	}
 
+	operator string_view() const noexcept {
+		return value;
+	}
+
 	constexpr const_pointer c_str() const noexcept {
 		return value;
 	}
@@ -141,7 +137,7 @@ public:
 	}
 
 	AllocatedString Clone() const {
-		return Duplicate(c_str());
+		return Duplicate(*this);
 	}
 };
 

src/util/meson.build

@@ -7,7 +7,6 @@ util = static_library(
   'MimeType.cxx',
   'NumberParser.cxx',
   'StringView.cxx',
-  'AllocatedString.cxx',
   'TruncateString.cxx',
   'StringStrip.cxx',
   'StringUtil.cxx',