Host: Add FormatNumber()

Formats the argument according to the system locale, instead of C.

src/duckstation-mini/mini_host.cpp

@@ -48,6 +48,7 @@
 #include <cmath>
 #include <condition_variable>
 #include <csignal>
+#include <ctime>
 #include <thread>
 
 LOG_CHANNEL(Host);
@@ -1375,6 +1376,64 @@ bool Host::CopyTextToClipboard(std::string_view text)
   return true;
 }
 
+std::string Host::FormatNumber(NumberFormatType type, s64 value)
+{
+  std::string ret;
+
+  if (type >= NumberFormatType::ShortDate && type <= NumberFormatType::LongDateTime)
+  {
+    const char* format;
+    switch (type)
+    {
+      case NumberFormatType::ShortDate:
+        format = "%x";
+        break;
+
+      case NumberFormatType::LongDate:
+        format = "%A %B %e %Y";
+        break;
+
+      case NumberFormatType::ShortTime:
+      case NumberFormatType::LongTime:
+        format = "%X";
+        break;
+
+      case NumberFormatType::ShortDateTime:
+        format = "%X %x";
+        break;
+
+      case NumberFormatType::LongDateTime:
+        format = "%c";
+        break;
+
+        DefaultCaseIsUnreachable();
+    }
+
+    struct tm ttime = {};
+    const std::time_t tvalue = static_cast<std::time_t>(value);
+#ifdef _MSC_VER
+    localtime_s(&ttime, &tvalue);
+#else
+    localtime_r(&tvalue, &ttime);
+#endif
+
+    char buf[128];
+    std::strftime(buf, std::size(buf), "%x", &ttime);
+    ret.assign(buf);
+  }
+  else
+  {
+    ret = fmt::format("{}", value);
+  }
+
+  return ret;
+}
+
+std::string Host::FormatNumber(NumberFormatType type, double value)
+{
+  return fmt::format("{}", value);
+}
+
 std::optional<u32> InputManager::ConvertHostKeyboardStringToCode(std::string_view str)
 {
   return SDLKeyNames::GetKeyCodeForName(str);

src/duckstation-qt/qthost.cpp

@@ -2164,6 +2164,61 @@ bool Host::CopyTextToClipboard(std::string_view text)
   return true;
 }
 
+std::string Host::FormatNumber(NumberFormatType type, s64 value)
+{
+  const QLocale loc = QLocale::system();
+  std::string ret;
+
+  if (type >= NumberFormatType::ShortDate && type <= NumberFormatType::LongDateTime)
+  {
+    QString format;
+    switch (type)
+    {
+      case NumberFormatType::ShortDate:
+      case NumberFormatType::LongDate:
+        format = loc.dateFormat((type == NumberFormatType::LongDate) ? QLocale::LongFormat : QLocale::ShortFormat);
+        break;
+
+      case NumberFormatType::ShortTime:
+      case NumberFormatType::LongTime:
+        format = loc.timeFormat((type == NumberFormatType::LongTime) ? QLocale::LongFormat : QLocale::ShortFormat);
+        break;
+
+      case NumberFormatType::ShortDateTime:
+      case NumberFormatType::LongDateTime:
+        format =
+          loc.dateTimeFormat((type == NumberFormatType::LongDateTime) ? QLocale::LongFormat : QLocale::ShortFormat);
+        break;
+
+        DefaultCaseIsUnreachable();
+    }
+
+    ret = QDateTime::fromSecsSinceEpoch(value).toString(format).toStdString();
+  }
+  else
+  {
+    ret = loc.toString(value).toStdString();
+  }
+
+  return ret;
+}
+
+std::string Host::FormatNumber(NumberFormatType type, double value)
+{
+  const QLocale loc = QLocale::system();
+  std::string ret;
+
+  switch (type)
+  {
+    case NumberFormatType::Number:
+    default:
+      ret = loc.toString(value).toStdString();
+      break;
+  }
+
+  return ret;
+}
+
 void Host::ReportDebuggerMessage(std::string_view message)
 {
   INFO_LOG("Debugger message: {}", message);

src/duckstation-regtest/regtest_host.cpp

@@ -40,6 +40,7 @@
 
 #include <csignal>
 #include <cstdio>
+#include <ctime>
 
 LOG_CHANNEL(Host);
 
@@ -565,6 +566,64 @@ bool Host::CopyTextToClipboard(std::string_view text)
   return false;
 }
 
+std::string Host::FormatNumber(NumberFormatType type, s64 value)
+{
+  std::string ret;
+
+  if (type >= NumberFormatType::ShortDate && type <= NumberFormatType::LongDateTime)
+  {
+    const char* format;
+    switch (type)
+    {
+      case NumberFormatType::ShortDate:
+        format = "%x";
+        break;
+
+      case NumberFormatType::LongDate:
+        format = "%A %B %e %Y";
+        break;
+
+      case NumberFormatType::ShortTime:
+      case NumberFormatType::LongTime:
+        format = "%X";
+        break;
+
+      case NumberFormatType::ShortDateTime:
+        format = "%X %x";
+        break;
+
+      case NumberFormatType::LongDateTime:
+        format = "%c";
+        break;
+
+        DefaultCaseIsUnreachable();
+    }
+
+    struct tm ttime = {};
+    const std::time_t tvalue = static_cast<std::time_t>(value);
+#ifdef _MSC_VER
+    localtime_s(&ttime, &tvalue);
+#else
+    localtime_r(&tvalue, &ttime);
+#endif
+
+    char buf[128];
+    std::strftime(buf, std::size(buf), "%x", &ttime);
+    ret.assign(buf);
+  }
+  else
+  {
+    ret = fmt::format("{}", value);
+  }
+
+  return ret;
+}
+
+std::string Host::FormatNumber(NumberFormatType type, double value)
+{
+  return fmt::format("{}", value);
+}
+
 void Host::SetMouseMode(bool relative, bool hide_cursor)
 {
   //

src/util/host.h

@@ -59,6 +59,22 @@ std::string GetClipboardText();
 /// Copies the provided UTF-8 text to the host's clipboard, if present.
 bool CopyTextToClipboard(std::string_view text);
 
+/// Formats a number according to the current locale.
+enum class NumberFormatType : u8
+{
+  ShortDate,     // Date formatting
+  LongDate,      // Date formatting
+  ShortTime,     // Time formatting
+  LongTime,      // Time formatting
+  ShortDateTime, // Date and time formatting
+  LongDateTime,  // Date and time formatting
+  Number,        // Number formatting
+
+  MaxCount,
+};
+std::string FormatNumber(NumberFormatType type, s64 value);
+std::string FormatNumber(NumberFormatType type, double value);
+
 /// Returns a localized version of the specified string within the specified context.
 /// The pointer is guaranteed to be valid until the next language change.
 const char* TranslateToCString(std::string_view context, std::string_view msg, std::string_view disambiguation = {});