// Copyright 2017 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/fx_system.h"
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#include <limits>
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#include "core/fxcrt/fx_extension.h"
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namespace {
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template <typename IntType, typename CharType>
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IntType FXSYS_StrToInt(const CharType* str) {
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if (!str)
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return 0;
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// Process the sign.
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bool neg = *str == '-';
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if (neg || *str == '+')
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str++;
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IntType num = 0;
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while (*str && FXSYS_isDecimalDigit(*str)) {
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IntType val = FXSYS_DecimalCharToInt(*str);
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if (num > (std::numeric_limits<IntType>::max() - val) / 10) {
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if (neg && std::numeric_limits<IntType>::is_signed) {
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// Return MIN when the represented number is signed type and is smaller
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// than the min value.
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return std::numeric_limits<IntType>::min();
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} else {
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// Return MAX when the represented number is signed type and is larger
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// than the max value, or the number is unsigned type and out of range.
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return std::numeric_limits<IntType>::max();
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}
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}
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num = num * 10 + val;
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str++;
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}
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// When it is a negative value, -num should be returned. Since num may be of
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// unsigned type, use ~num + 1 to avoid the warning of applying unary minus
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// operator to unsigned type.
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return neg ? ~num + 1 : num;
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}
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template <typename T, typename UT, typename STR_T>
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STR_T FXSYS_IntToStr(T value, STR_T str, int radix) {
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if (radix < 2 || radix > 16) {
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str[0] = 0;
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return str;
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}
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if (value == 0) {
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str[0] = '0';
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str[1] = 0;
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return str;
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}
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int i = 0;
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UT uvalue;
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if (value < 0) {
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str[i++] = '-';
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// Standard trick to avoid undefined behaviour when negating INT_MIN.
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uvalue = static_cast<UT>(-(value + 1)) + 1;
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} else {
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uvalue = value;
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}
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int digits = 1;
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T order = uvalue / radix;
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while (order > 0) {
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digits++;
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order = order / radix;
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}
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for (int d = digits - 1; d > -1; d--) {
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str[d + i] = "0123456789abcdef"[uvalue % radix];
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uvalue /= radix;
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}
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str[digits + i] = 0;
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return str;
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}
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} // namespace
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int FXSYS_round(float d) {
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if (d < static_cast<float>(std::numeric_limits<int>::min()))
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return std::numeric_limits<int>::min();
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if (d > static_cast<float>(std::numeric_limits<int>::max()))
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return std::numeric_limits<int>::max();
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return static_cast<int>(round(d));
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}
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int32_t FXSYS_atoi(const char* str) {
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return FXSYS_StrToInt<int32_t, char>(str);
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}
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uint32_t FXSYS_atoui(const char* str) {
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return FXSYS_StrToInt<uint32_t>(str);
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}
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int32_t FXSYS_wtoi(const wchar_t* str) {
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return FXSYS_StrToInt<int32_t, wchar_t>(str);
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}
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int64_t FXSYS_atoi64(const char* str) {
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return FXSYS_StrToInt<int64_t, char>(str);
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}
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const char* FXSYS_i64toa(int64_t value, char* str, int radix) {
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return FXSYS_IntToStr<int64_t, uint64_t, char*>(value, str, radix);
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}
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#if _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_
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int FXSYS_GetACP() {
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return 0;
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}
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char* FXSYS_strlwr(char* str) {
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if (!str) {
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return nullptr;
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}
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char* s = str;
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while (*str) {
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*str = FXSYS_tolower(*str);
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str++;
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}
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return s;
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}
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char* FXSYS_strupr(char* str) {
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if (!str) {
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return nullptr;
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}
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char* s = str;
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while (*str) {
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*str = FXSYS_toupper(*str);
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str++;
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}
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return s;
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}
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wchar_t* FXSYS_wcslwr(wchar_t* str) {
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if (!str) {
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return nullptr;
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}
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wchar_t* s = str;
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while (*str) {
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*str = FXSYS_tolower(*str);
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str++;
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}
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return s;
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}
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wchar_t* FXSYS_wcsupr(wchar_t* str) {
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if (!str) {
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return nullptr;
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}
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wchar_t* s = str;
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while (*str) {
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*str = FXSYS_toupper(*str);
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str++;
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}
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return s;
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}
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int FXSYS_stricmp(const char* dst, const char* src) {
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int f;
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int l;
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do {
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f = FXSYS_toupper(*dst);
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l = FXSYS_toupper(*src);
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++dst;
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++src;
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} while (f && f == l);
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return f - l;
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}
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int FXSYS_wcsicmp(const wchar_t* dst, const wchar_t* src) {
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wchar_t f;
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wchar_t l;
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do {
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f = FXSYS_toupper(*dst);
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l = FXSYS_toupper(*src);
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++dst;
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++src;
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} while (f && f == l);
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return f - l;
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}
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char* FXSYS_itoa(int value, char* str, int radix) {
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return FXSYS_IntToStr<int32_t, uint32_t, char*>(value, str, radix);
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}
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int FXSYS_WideCharToMultiByte(uint32_t codepage,
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uint32_t dwFlags,
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const wchar_t* wstr,
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int wlen,
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char* buf,
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int buflen,
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const char* default_str,
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int* pUseDefault) {
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int len = 0;
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for (int i = 0; i < wlen; i++) {
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if (wstr[i] < 0x100) {
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if (buf && len < buflen)
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buf[len] = static_cast<char>(wstr[i]);
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len++;
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}
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}
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return len;
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}
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int FXSYS_MultiByteToWideChar(uint32_t codepage,
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uint32_t dwFlags,
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const char* bstr,
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int blen,
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wchar_t* buf,
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int buflen) {
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int wlen = 0;
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for (int i = 0; i < blen; i++) {
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if (buf && wlen < buflen) {
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buf[wlen] = bstr[i];
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}
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wlen++;
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}
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return wlen;
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}
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#else // _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_
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size_t FXSYS_wcsftime(wchar_t* strDest,
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size_t maxsize,
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const wchar_t* format,
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const struct tm* timeptr) {
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// Avoid tripping an invalid parameter handler and crashing process.
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// Note: leap seconds may cause tm_sec == 60.
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if (timeptr->tm_year < -1900 || timeptr->tm_year > 8099 ||
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timeptr->tm_mon < 0 || timeptr->tm_mon > 11 || timeptr->tm_mday < 1 ||
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timeptr->tm_mday > 31 || timeptr->tm_hour < 0 || timeptr->tm_hour > 23 ||
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timeptr->tm_min < 0 || timeptr->tm_min > 59 || timeptr->tm_sec < 0 ||
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timeptr->tm_sec > 60 || timeptr->tm_wday < 0 || timeptr->tm_wday > 6 ||
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timeptr->tm_yday < 0 || timeptr->tm_yday > 365) {
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strDest[0] = L'\0';
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return 0;
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}
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return wcsftime(strDest, maxsize, format, timeptr);
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}
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#endif // _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_
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