1 files changed, 206 insertions, 3 deletions

diff --git a/core/fxcrt/fx_system.cpp b/core/fxcrt/fx_system.cpp
index 83f761ff85..bf13ad2e5e 100644
--- a/core/fxcrt/fx_system.cpp
+++ b/core/fxcrt/fx_system.cpp
@@ -8,7 +8,81 @@
 
 #include <limits>
 
-extern "C" int FXSYS_round(float d) {
+#include "core/fxcrt/fx_extension.h"
+
+namespace {
+
+template <typename IntType, typename CharType>
+IntType FXSYS_StrToInt(const CharType* str) {
+  if (!str)
+    return 0;
+
+  // Process the sign.
+  bool neg = *str == '-';
+  if (neg || *str == '+')
+    str++;
+
+  IntType num = 0;
+  while (*str && FXSYS_isDecimalDigit(*str)) {
+    IntType val = FXSYS_DecimalCharToInt(*str);
+    if (num > (std::numeric_limits<IntType>::max() - val) / 10) {
+      if (neg && std::numeric_limits<IntType>::is_signed) {
+        // Return MIN when the represented number is signed type and is smaller
+        // than the min value.
+        return std::numeric_limits<IntType>::min();
+      } else {
+        // Return MAX when the represented number is signed type and is larger
+        // than the max value, or the number is unsigned type and out of range.
+        return std::numeric_limits<IntType>::max();
+      }
+    }
+
+    num = num * 10 + val;
+    str++;
+  }
+  // When it is a negative value, -num should be returned. Since num may be of
+  // unsigned type, use ~num + 1 to avoid the warning of applying unary minus
+  // operator to unsigned type.
+  return neg ? ~num + 1 : num;
+}
+
+template <typename T, typename UT, typename STR_T>
+STR_T FXSYS_IntToStr(T value, STR_T str, int radix) {
+  if (radix < 2 || radix > 16) {
+    str[0] = 0;
+    return str;
+  }
+  if (value == 0) {
+    str[0] = '0';
+    str[1] = 0;
+    return str;
+  }
+  int i = 0;
+  UT uvalue;
+  if (value < 0) {
+    str[i++] = '-';
+    // Standard trick to avoid undefined behaviour when negating INT_MIN.
+    uvalue = static_cast<UT>(-(value + 1)) + 1;
+  } else {
+    uvalue = value;
+  }
+  int digits = 1;
+  T order = uvalue / radix;
+  while (order > 0) {
+    digits++;
+    order = order / radix;
+  }
+  for (int d = digits - 1; d > -1; d--) {
+    str[d + i] = "0123456789abcdef"[uvalue % radix];
+    uvalue /= radix;
+  }
+  str[digits + i] = 0;
+  return str;
+}
+
+}  // namespace
+
+int FXSYS_round(float d) {
   if (d < static_cast<float>(std::numeric_limits<int>::min()))
     return std::numeric_limits<int>::min();
   if (d > static_cast<float>(std::numeric_limits<int>::max()))
@@ -16,7 +90,136 @@ extern "C" int FXSYS_round(float d) {
   return static_cast<int>(round(d));
 }
 
-#if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
+int32_t FXSYS_atoi(const char* str) {
+  return FXSYS_StrToInt<int32_t, char>(str);
+}
+uint32_t FXSYS_atoui(const char* str) {
+  return FXSYS_StrToInt<uint32_t>(str);
+}
+int32_t FXSYS_wtoi(const wchar_t* str) {
+  return FXSYS_StrToInt<int32_t, wchar_t>(str);
+}
+int64_t FXSYS_atoi64(const char* str) {
+  return FXSYS_StrToInt<int64_t, char>(str);
+}
+const char* FXSYS_i64toa(int64_t value, char* str, int radix) {
+  return FXSYS_IntToStr<int64_t, uint64_t, char*>(value, str, radix);
+}
+
+#if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
+
+int FXSYS_GetACP() {
+  return 0;
+}
+
+char* FXSYS_strlwr(char* str) {
+  if (!str) {
+    return nullptr;
+  }
+  char* s = str;
+  while (*str) {
+    *str = FXSYS_tolower(*str);
+    str++;
+  }
+  return s;
+}
+char* FXSYS_strupr(char* str) {
+  if (!str) {
+    return nullptr;
+  }
+  char* s = str;
+  while (*str) {
+    *str = FXSYS_toupper(*str);
+    str++;
+  }
+  return s;
+}
+wchar_t* FXSYS_wcslwr(wchar_t* str) {
+  if (!str) {
+    return nullptr;
+  }
+  wchar_t* s = str;
+  while (*str) {
+    *str = FXSYS_tolower(*str);
+    str++;
+  }
+  return s;
+}
+wchar_t* FXSYS_wcsupr(wchar_t* str) {
+  if (!str) {
+    return nullptr;
+  }
+  wchar_t* s = str;
+  while (*str) {
+    *str = FXSYS_toupper(*str);
+    str++;
+  }
+  return s;
+}
+
+int FXSYS_stricmp(const char* dst, const char* src) {
+  int f;
+  int l;
+  do {
+    f = FXSYS_toupper(*dst);
+    l = FXSYS_toupper(*src);
+    ++dst;
+    ++src;
+  } while (f && f == l);
+  return f - l;
+}
+
+int FXSYS_wcsicmp(const wchar_t* dst, const wchar_t* src) {
+  wchar_t f;
+  wchar_t l;
+  do {
+    f = FXSYS_toupper(*dst);
+    l = FXSYS_toupper(*src);
+    ++dst;
+    ++src;
+  } while (f && f == l);
+  return f - l;
+}
+
+char* FXSYS_itoa(int value, char* str, int radix) {
+  return FXSYS_IntToStr<int32_t, uint32_t, char*>(value, str, radix);
+}
+
+int FXSYS_WideCharToMultiByte(uint32_t codepage,
+                              uint32_t dwFlags,
+                              const wchar_t* wstr,
+                              int wlen,
+                              char* buf,
+                              int buflen,
+                              const char* default_str,
+                              int* pUseDefault) {
+  int len = 0;
+  for (int i = 0; i < wlen; i++) {
+    if (wstr[i] < 0x100) {
+      if (buf && len < buflen)
+        buf[len] = static_cast<char>(wstr[i]);
+      len++;
+    }
+  }
+  return len;
+}
+int FXSYS_MultiByteToWideChar(uint32_t codepage,
+                              uint32_t dwFlags,
+                              const char* bstr,
+                              int blen,
+                              wchar_t* buf,
+                              int buflen) {
+  int wlen = 0;
+  for (int i = 0; i < blen; i++) {
+    if (buf && wlen < buflen) {
+      buf[wlen] = bstr[i];
+    }
+    wlen++;
+  }
+  return wlen;
+}
+
+#else  // _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
 
 size_t FXSYS_wcsftime(wchar_t* strDest,
                       size_t maxsize,
@@ -36,4 +239,4 @@ size_t FXSYS_wcsftime(wchar_t* strDest,
   return wcsftime(strDest, maxsize, format, timeptr);
 }
 
-#endif  // _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
+#endif  // _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_