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https://github.com/mollyim/webrtc.git
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62238097c9
This is a safe cleanup change since top-level const applied to parameters in function declarations (that are not also definitions) are ignored by the compiler. Hence, such changes do not change the type of the declared functions and are simply no-ops. Bug: webrtc:13610 Change-Id: Ibafb92c45119a6d8bdb6f9109aa8dad6385163a9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249086 Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Ali Tofigh <alito@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35802}
130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_STRING_UTILS_H_
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#define RTC_BASE_STRING_UTILS_H_
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#include <ctype.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#if defined(WEBRTC_WIN)
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#include <malloc.h>
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#include <wchar.h>
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#include <windows.h>
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#endif // WEBRTC_WIN
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#if defined(WEBRTC_POSIX)
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#include <stdlib.h>
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#include <strings.h>
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#endif // WEBRTC_POSIX
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#include <string>
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namespace rtc {
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const size_t SIZE_UNKNOWN = static_cast<size_t>(-1);
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// Safe version of strncpy that always nul-terminate.
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size_t strcpyn(char* buffer,
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size_t buflen,
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const char* source,
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size_t srclen = SIZE_UNKNOWN);
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///////////////////////////////////////////////////////////////////////////////
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// UTF helpers (Windows only)
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///////////////////////////////////////////////////////////////////////////////
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#if defined(WEBRTC_WIN)
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inline std::wstring ToUtf16(const char* utf8, size_t len) {
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if (len == 0)
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return std::wstring();
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int len16 = ::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len),
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nullptr, 0);
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std::wstring ws(len16, 0);
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::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len), &*ws.begin(),
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len16);
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return ws;
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}
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inline std::wstring ToUtf16(const std::string& str) {
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return ToUtf16(str.data(), str.length());
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}
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inline std::string ToUtf8(const wchar_t* wide, size_t len) {
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if (len == 0)
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return std::string();
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int len8 = ::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len),
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nullptr, 0, nullptr, nullptr);
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std::string ns(len8, 0);
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::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len), &*ns.begin(),
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len8, nullptr, nullptr);
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return ns;
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}
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inline std::string ToUtf8(const wchar_t* wide) {
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return ToUtf8(wide, wcslen(wide));
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}
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inline std::string ToUtf8(const std::wstring& wstr) {
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return ToUtf8(wstr.data(), wstr.length());
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}
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#endif // WEBRTC_WIN
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// Remove leading and trailing whitespaces.
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std::string string_trim(const std::string& s);
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// TODO(jonasolsson): replace with absl::Hex when that becomes available.
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std::string ToHex(int i);
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// CompileTimeString comprises of a string-like object which can be used as a
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// regular const char* in compile time and supports concatenation. Useful for
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// concatenating constexpr strings in for example macro declarations.
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namespace rtc_base_string_utils_internal {
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template <int NPlus1>
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struct CompileTimeString {
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char string[NPlus1] = {0};
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constexpr CompileTimeString() = default;
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template <int MPlus1>
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explicit constexpr CompileTimeString(const char (&chars)[MPlus1]) {
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char* chars_pointer = string;
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for (auto c : chars)
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*chars_pointer++ = c;
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}
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template <int MPlus1>
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constexpr auto Concat(CompileTimeString<MPlus1> b) {
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CompileTimeString<NPlus1 + MPlus1 - 1> result;
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char* chars_pointer = result.string;
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for (auto c : string)
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*chars_pointer++ = c;
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chars_pointer = result.string + NPlus1 - 1;
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for (auto c : b.string)
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*chars_pointer++ = c;
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result.string[NPlus1 + MPlus1 - 2] = 0;
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return result;
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}
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constexpr operator const char*() { return string; }
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};
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} // namespace rtc_base_string_utils_internal
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// Makes a constexpr CompileTimeString<X> without having to specify X
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// explicitly.
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template <int N>
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constexpr auto MakeCompileTimeString(const char (&a)[N]) {
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return rtc_base_string_utils_internal::CompileTimeString<N>(a);
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}
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} // namespace rtc
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#endif // RTC_BASE_STRING_UTILS_H_
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