blob: 702bc67b7957c0721258bc219551977965478537 [file] [log] [blame]
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#if defined(WEBRTC_WIN)
#include <malloc.h>
#include <wchar.h>
#include <windows.h>
#define alloca _alloca
#endif // WEBRTC_WIN
#if defined(WEBRTC_POSIX)
#ifdef BSD
#include <stdlib.h>
#else // BSD
#include <alloca.h>
#endif // !BSD
#include <strings.h>
#endif // WEBRTC_POSIX
#include <string>
// Generic string/memory utilities
static_cast<TYPE*>(::alloca((LEN) * sizeof(TYPE)))
// Traits simplifies porting string functions to be CTYPE-agnostic
namespace rtc {
const size_t SIZE_UNKNOWN = static_cast<size_t>(-1);
// Safe version of strncpy that always nul-terminate.
size_t strcpyn(char* buffer,
size_t buflen,
const char* source,
size_t srclen = SIZE_UNKNOWN);
// UTF helpers (Windows only)
#if defined(WEBRTC_WIN)
inline std::wstring ToUtf16(const char* utf8, size_t len) {
int len16 = ::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len),
nullptr, 0);
wchar_t* ws = STACK_ARRAY(wchar_t, len16);
::MultiByteToWideChar(CP_UTF8, 0, utf8, static_cast<int>(len), ws, len16);
return std::wstring(ws, len16);
inline std::wstring ToUtf16(const std::string& str) {
return ToUtf16(, str.length());
inline std::string ToUtf8(const wchar_t* wide, size_t len) {
int len8 = ::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len),
nullptr, 0, nullptr, nullptr);
char* ns = STACK_ARRAY(char, len8);
::WideCharToMultiByte(CP_UTF8, 0, wide, static_cast<int>(len), ns, len8,
nullptr, nullptr);
return std::string(ns, len8);
inline std::string ToUtf8(const wchar_t* wide) {
return ToUtf8(wide, wcslen(wide));
inline std::string ToUtf8(const std::wstring& wstr) {
return ToUtf8(, wstr.length());
#endif // WEBRTC_WIN
// Replaces all occurrences of "search" with "replace".
void replace_substrs(const char* search,
size_t search_len,
const char* replace,
size_t replace_len,
std::string* s);
// True iff s1 starts with s2.
bool starts_with(const char* s1, const char* s2);
// True iff s1 ends with s2.
bool ends_with(const char* s1, const char* s2);
// Remove leading and trailing whitespaces.
std::string string_trim(const std::string& s);
// TODO(jonasolsson): replace with absl::Hex when that becomes available.
std::string ToHex(const int i);
std::string LeftPad(char padding, unsigned length, std::string s);
} // namespace rtc