citra/src/common/string_util.cpp
Lioncash 995d1cd785 string_util: Get rid of separate resize() in CPToUTF16(), UTF16ToUTF8(), CodeToUTF8() and UTF8ToUTF16()
There's no need to perform the resize separately here, since the
constructor allows presizing the buffer.

Also move the empty string check before the construction of the string
to make the early out more straightforward.
2018-07-30 18:18:15 +08:00

479 lines
14 KiB
C++

// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cctype>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include "common/common_paths.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#ifdef _WIN32
#include <codecvt>
#include <windows.h>
#include "common/common_funcs.h"
#else
#include <iconv.h>
#endif
namespace Common {
/// Make a string lowercase
std::string ToLower(std::string str) {
std::transform(str.begin(), str.end(), str.begin(),
[](unsigned char c) { return std::tolower(c); });
return str;
}
/// Make a string uppercase
std::string ToUpper(std::string str) {
std::transform(str.begin(), str.end(), str.begin(),
[](unsigned char c) { return std::toupper(c); });
return str;
}
bool CharArrayFromFormatV(char* out, int outsize, const char* format, va_list args) {
int writtenCount;
#ifdef _MSC_VER
// You would think *printf are simple, right? Iterate on each character,
// if it's a format specifier handle it properly, etc.
//
// Nooooo. Not according to the C standard.
//
// According to the C99 standard (7.19.6.1 "The fprintf function")
// The format shall be a multibyte character sequence
//
// Because some character encodings might have '%' signs in the middle of
// a multibyte sequence (SJIS for example only specifies that the first
// byte of a 2 byte sequence is "high", the second byte can be anything),
// printf functions have to decode the multibyte sequences and try their
// best to not screw up.
//
// Unfortunately, on Windows, the locale for most languages is not UTF-8
// as we would need. Notably, for zh_TW, Windows chooses EUC-CN as the
// locale, and completely fails when trying to decode UTF-8 as EUC-CN.
//
// On the other hand, the fix is simple: because we use UTF-8, no such
// multibyte handling is required as we can simply assume that no '%' char
// will be present in the middle of a multibyte sequence.
//
// This is why we lookup an ANSI (cp1252) locale here and use _vsnprintf_l.
static locale_t c_locale = nullptr;
if (!c_locale)
c_locale = _create_locale(LC_ALL, ".1252");
writtenCount = _vsnprintf_l(out, outsize, format, c_locale, args);
#else
writtenCount = vsnprintf(out, outsize, format, args);
#endif
if (writtenCount > 0 && writtenCount < outsize) {
out[writtenCount] = '\0';
return true;
} else {
out[outsize - 1] = '\0';
return false;
}
}
std::string StringFromFormat(const char* format, ...) {
va_list args;
char* buf = nullptr;
#ifdef _WIN32
int required = 0;
va_start(args, format);
required = _vscprintf(format, args);
buf = new char[required + 1];
CharArrayFromFormatV(buf, required + 1, format, args);
va_end(args);
std::string temp = buf;
delete[] buf;
#else
va_start(args, format);
if (vasprintf(&buf, format, args) < 0)
LOG_ERROR(Common, "Unable to allocate memory for string");
va_end(args);
std::string temp = buf;
free(buf);
#endif
return temp;
}
// For Debugging. Read out an u8 array.
std::string ArrayToString(const u8* data, size_t size, int line_len, bool spaces) {
std::ostringstream oss;
oss << std::setfill('0') << std::hex;
for (int line = 0; size; ++data, --size) {
oss << std::setw(2) << (int)*data;
if (line_len == ++line) {
oss << '\n';
line = 0;
} else if (spaces)
oss << ' ';
}
return oss.str();
}
// Turns " hej " into "hej". Also handles tabs.
std::string StripSpaces(const std::string& str) {
const size_t s = str.find_first_not_of(" \t\r\n");
if (str.npos != s)
return str.substr(s, str.find_last_not_of(" \t\r\n") - s + 1);
else
return "";
}
// "\"hello\"" is turned to "hello"
// This one assumes that the string has already been space stripped in both
// ends, as done by StripSpaces above, for example.
std::string StripQuotes(const std::string& s) {
if (s.size() && '\"' == s[0] && '\"' == *s.rbegin())
return s.substr(1, s.size() - 2);
else
return s;
}
bool TryParse(const std::string& str, u32* const output) {
char* endptr = nullptr;
// Reset errno to a value other than ERANGE
errno = 0;
unsigned long value = strtoul(str.c_str(), &endptr, 0);
if (!endptr || *endptr)
return false;
if (errno == ERANGE)
return false;
#if ULONG_MAX > UINT_MAX
if (value >= 0x100000000ull && value <= 0xFFFFFFFF00000000ull)
return false;
#endif
*output = static_cast<u32>(value);
return true;
}
bool TryParse(const std::string& str, bool* const output) {
if ("1" == str || "true" == ToLower(str))
*output = true;
else if ("0" == str || "false" == ToLower(str))
*output = false;
else
return false;
return true;
}
std::string StringFromBool(bool value) {
return value ? "True" : "False";
}
bool SplitPath(const std::string& full_path, std::string* _pPath, std::string* _pFilename,
std::string* _pExtension) {
if (full_path.empty())
return false;
size_t dir_end = full_path.find_last_of("/"
// windows needs the : included for something like just "C:" to be considered a directory
#ifdef _WIN32
":"
#endif
);
if (std::string::npos == dir_end)
dir_end = 0;
else
dir_end += 1;
size_t fname_end = full_path.rfind('.');
if (fname_end < dir_end || std::string::npos == fname_end)
fname_end = full_path.size();
if (_pPath)
*_pPath = full_path.substr(0, dir_end);
if (_pFilename)
*_pFilename = full_path.substr(dir_end, fname_end - dir_end);
if (_pExtension)
*_pExtension = full_path.substr(fname_end);
return true;
}
void BuildCompleteFilename(std::string& _CompleteFilename, const std::string& _Path,
const std::string& _Filename) {
_CompleteFilename = _Path;
// check for seperator
if (DIR_SEP_CHR != *_CompleteFilename.rbegin())
_CompleteFilename += DIR_SEP_CHR;
// add the filename
_CompleteFilename += _Filename;
}
void SplitString(const std::string& str, const char delim, std::vector<std::string>& output) {
std::istringstream iss(str);
output.resize(1);
while (std::getline(iss, *output.rbegin(), delim)) {
output.emplace_back();
}
output.pop_back();
}
std::string TabsToSpaces(int tab_size, std::string in) {
size_t i = 0;
while ((i = in.find('\t')) != std::string::npos) {
in.replace(i, 1, tab_size, ' ');
}
return in;
}
std::string ReplaceAll(std::string result, const std::string& src, const std::string& dest) {
size_t pos = 0;
if (src == dest)
return result;
while ((pos = result.find(src, pos)) != std::string::npos) {
result.replace(pos, src.size(), dest);
pos += dest.length();
}
return result;
}
#ifdef _WIN32
std::string UTF16ToUTF8(const std::u16string& input) {
#if _MSC_VER >= 1900
// Workaround for missing char16_t/char32_t instantiations in MSVC2015
std::wstring_convert<std::codecvt_utf8_utf16<__int16>, __int16> convert;
std::basic_string<__int16> tmp_buffer(input.cbegin(), input.cend());
return convert.to_bytes(tmp_buffer);
#else
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
return convert.to_bytes(input);
#endif
}
std::u16string UTF8ToUTF16(const std::string& input) {
#if _MSC_VER >= 1900
// Workaround for missing char16_t/char32_t instantiations in MSVC2015
std::wstring_convert<std::codecvt_utf8_utf16<__int16>, __int16> convert;
auto tmp_buffer = convert.from_bytes(input);
return std::u16string(tmp_buffer.cbegin(), tmp_buffer.cend());
#else
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
return convert.from_bytes(input);
#endif
}
static std::wstring CPToUTF16(u32 code_page, const std::string& input) {
const auto size =
MultiByteToWideChar(code_page, 0, input.data(), static_cast<int>(input.size()), nullptr, 0);
if (size == 0) {
return L"";
}
std::wstring output(size, L'\0');
if (size != MultiByteToWideChar(code_page, 0, input.data(), static_cast<int>(input.size()),
&output[0], static_cast<int>(output.size()))) {
output.clear();
}
return output;
}
std::string UTF16ToUTF8(const std::wstring& input) {
const auto size = WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<int>(input.size()),
nullptr, 0, nullptr, nullptr);
if (size == 0) {
return "";
}
std::string output(size, '\0');
if (size != WideCharToMultiByte(CP_UTF8, 0, input.data(), static_cast<int>(input.size()),
&output[0], static_cast<int>(output.size()), nullptr,
nullptr)) {
output.clear();
}
return output;
}
std::wstring UTF8ToUTF16W(const std::string& input) {
return CPToUTF16(CP_UTF8, input);
}
std::string SHIFTJISToUTF8(const std::string& input) {
return UTF16ToUTF8(CPToUTF16(932, input));
}
std::string CP1252ToUTF8(const std::string& input) {
return UTF16ToUTF8(CPToUTF16(1252, input));
}
#else
template <typename T>
static std::string CodeToUTF8(const char* fromcode, const std::basic_string<T>& input) {
iconv_t const conv_desc = iconv_open("UTF-8", fromcode);
if ((iconv_t)(-1) == conv_desc) {
LOG_ERROR(Common, "Iconv initialization failure [{}]: {}", fromcode, strerror(errno));
iconv_close(conv_desc);
return {};
}
const size_t in_bytes = sizeof(T) * input.size();
// Multiply by 4, which is the max number of bytes to encode a codepoint
const size_t out_buffer_size = 4 * in_bytes;
std::string out_buffer(out_buffer_size, '\0');
auto src_buffer = &input[0];
size_t src_bytes = in_bytes;
auto dst_buffer = &out_buffer[0];
size_t dst_bytes = out_buffer.size();
while (0 != src_bytes) {
size_t const iconv_result =
iconv(conv_desc, (char**)(&src_buffer), &src_bytes, &dst_buffer, &dst_bytes);
if (static_cast<size_t>(-1) == iconv_result) {
if (EILSEQ == errno || EINVAL == errno) {
// Try to skip the bad character
if (0 != src_bytes) {
--src_bytes;
++src_buffer;
}
} else {
LOG_ERROR(Common, "iconv failure [{}]: {}", fromcode, strerror(errno));
break;
}
}
}
std::string result;
out_buffer.resize(out_buffer_size - dst_bytes);
out_buffer.swap(result);
iconv_close(conv_desc);
return result;
}
std::u16string UTF8ToUTF16(const std::string& input) {
iconv_t const conv_desc = iconv_open("UTF-16LE", "UTF-8");
if ((iconv_t)(-1) == conv_desc) {
LOG_ERROR(Common, "Iconv initialization failure [UTF-8]: {}", strerror(errno));
iconv_close(conv_desc);
return {};
}
const size_t in_bytes = sizeof(char) * input.size();
// Multiply by 4, which is the max number of bytes to encode a codepoint
const size_t out_buffer_size = 4 * sizeof(char16_t) * in_bytes;
std::u16string out_buffer(out_buffer_size, char16_t{});
char* src_buffer = const_cast<char*>(&input[0]);
size_t src_bytes = in_bytes;
char* dst_buffer = (char*)(&out_buffer[0]);
size_t dst_bytes = out_buffer.size();
while (0 != src_bytes) {
size_t const iconv_result =
iconv(conv_desc, &src_buffer, &src_bytes, &dst_buffer, &dst_bytes);
if (static_cast<size_t>(-1) == iconv_result) {
if (EILSEQ == errno || EINVAL == errno) {
// Try to skip the bad character
if (0 != src_bytes) {
--src_bytes;
++src_buffer;
}
} else {
LOG_ERROR(Common, "iconv failure [UTF-8]: {}", strerror(errno));
break;
}
}
}
std::u16string result;
out_buffer.resize(out_buffer_size - dst_bytes);
out_buffer.swap(result);
iconv_close(conv_desc);
return result;
}
std::string UTF16ToUTF8(const std::u16string& input) {
return CodeToUTF8("UTF-16LE", input);
}
std::string CP1252ToUTF8(const std::string& input) {
// return CodeToUTF8("CP1252//TRANSLIT", input);
// return CodeToUTF8("CP1252//IGNORE", input);
return CodeToUTF8("CP1252", input);
}
std::string SHIFTJISToUTF8(const std::string& input) {
// return CodeToUTF8("CP932", input);
return CodeToUTF8("SJIS", input);
}
#endif
std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, size_t max_len) {
size_t len = 0;
while (len < max_len && buffer[len] != '\0')
++len;
return std::string(buffer, len);
}
const char* TrimSourcePath(const char* path, const char* root) {
const char* p = path;
while (*p != '\0') {
const char* next_slash = p;
while (*next_slash != '\0' && *next_slash != '/' && *next_slash != '\\') {
++next_slash;
}
bool is_src = Common::ComparePartialString(p, next_slash, root);
p = next_slash;
if (*p != '\0') {
++p;
}
if (is_src) {
path = p;
}
}
return path;
}
} // namespace Common