Logging nice fatal errors when dying, w/ a msgbox when not in a console.

src/xenia/logging.cc

@@ -12,11 +12,11 @@
 #include <xenia/common.h>
 
 
-void xe_log_line(const char* file_path, const uint32_t line_number,
-                 const char* function_name, const char level_char,
-                 const char* fmt, ...) {
-  const int kLogMax = 2048;
-
+void xe_format_log_line(
+    char* buffer, size_t buffer_count,
+    const char* file_path, const uint32_t line_number,
+    const char* function_name, const char level_char,
+    const char* fmt, va_list args) {
   // Strip out just the filename from the path.
   const char* filename = xestrrchra(file_path, XE_PATH_SEPARATOR);
   if (filename) {
@@ -27,32 +27,68 @@ void xe_log_line(const char* file_path, const uint32_t line_number,
     filename = file_path;
   }
 
+  // Format string - add a trailing newline if required.
+  const char* outfmt = "XE[%c] %s:%d: ";
+  char* buffer_ptr = buffer + xesnprintfa(
+      buffer, buffer_count - 1, outfmt, level_char, filename, line_number);
+
   // Scribble args into the print buffer.
+  buffer_ptr = buffer_ptr + xevsnprintfa(
+      buffer_ptr, buffer_count - (buffer_ptr - buffer) - 1, fmt, args);
+
+  // Add a trailing newline.
+  if (buffer_ptr[-1] != '\n') {
+    buffer_ptr[0] = '\n';
+    buffer_ptr[1] = 0;
+  }
+}
+
+void xe_log_line(const char* file_path, const uint32_t line_number,
+                 const char* function_name, const char level_char,
+                 const char* fmt, ...) {
+  char buffer[2048];
   va_list args;
   va_start(args, fmt);
-  char buffer[kLogMax];
-  int buffer_length = xevsnprintfa(buffer, XECOUNT(buffer), fmt, args);
+  xe_format_log_line(buffer, XECOUNT(buffer),
+                     file_path, line_number, function_name, level_char,
+                     fmt, args);
   va_end(args);
-  if (buffer_length < 0) {
-    return;
-  }
 
-  // Format string - add a trailing newline if required.
-  const char* outfmt;
-  if ((buffer_length >= 1) && buffer[buffer_length - 1] == '\n') {
-    outfmt = "XE[%c] %s:%d: %s";
-  } else {
-    outfmt = "XE[%c] %s:%d: %s\n";
-  }
+  fprintf(stderr, buffer);
+  fflush(stderr);
 
 #if 0// defined(OutputDebugString)
-  char full_output[kLogMax];
-  if (xesnprintfa(full_output, XECOUNT(buffer), outfmt, level_char,
-                  filename, line_number, buffer) >= 0) {
-    OutputDebugStringA(full_output);
-  }
+  OutputDebugStringA(buffer);
 #else
-  XEIGNORE(fprintf(stdout, outfmt, level_char, filename, line_number, buffer));
+  XEIGNORE(fprintf(stdout, buffer));
   fflush(stdout);
 #endif  // OutputDebugString
 }
+
+void xe_handle_fatal(
+    const char* file_path, const uint32_t line_number,
+    const char* function_name, const char* fmt, ...) {
+  char buffer[2048];
+  va_list args;
+  va_start(args, fmt);
+  xe_format_log_line(buffer, XECOUNT(buffer),
+                     file_path, line_number, function_name, 'X',
+                     fmt, args);
+  va_end(args);
+
+#if defined(OutputDebugString)
+  OutputDebugStringA(buffer);
+#endif  // OutputDebugString
+
+  fprintf(stderr, buffer);
+  fflush(stderr);
+
+#if XE_LIKE_WIN32
+  if (!xe_has_console()) {
+    MessageBoxA(NULL, buffer, "Xenia Error",
+                MB_OK | MB_ICONERROR | MB_APPLMODAL | MB_SETFOREGROUND);
+  }
+#endif  // WIN32
+
+  exit(1);
+}

src/xenia/logging.h

@@ -25,6 +25,9 @@ void xe_log_line(const char* file_path, const uint32_t line_number,
                  const char* function_name, const char level_char,
                  const char* fmt, ...) XE_LOG_LINE_ATTRIBUTE;
 #undef XE_LOG_LINE_ATTRIBUTE
+void xe_handle_fatal(
+    const char* file_path, const uint32_t line_number,
+    const char* function_name, const char* fmt, ...);
 
 #if XE_OPTION_ENABLE_LOGGING
 #define XELOGCORE(level, fmt, ...) xe_log_line( \
@@ -34,6 +37,11 @@ void xe_log_line(const char* file_path, const uint32_t line_number,
 #define XELOGCORE(level, fmt, ...) XE_EMPTY_MACRO
 #endif  // ENABLE_LOGGING
 
+#define XEFATAL(fmt, ...) do { \
+    xe_handle_fatal(XE_CURRENT_FILE, XE_CURRENT_LINE, XE_CURRENT_FUNCTION, \
+                    fmt, ##__VA_ARGS__); \
+  } while (false);
+
 #if XE_OPTION_LOG_ERROR
 #define XELOGE(fmt, ...) XELOGCORE('!', fmt, ##__VA_ARGS__)
 #else

src/xenia/platform.cc

@@ -18,6 +18,8 @@ namespace {
 
 typedef int (*user_main_t)(int argc, xechar_t** argv);
 
+bool _has_console = true;
+
 }  // namespace
 
 
@@ -58,14 +60,20 @@ int xe_main_thunk(
   return result;
 }
 
+bool xe_has_console() {
+  return _has_console;
+}
+
 void xe_attach_console() {
   bool has_console = AttachConsole(ATTACH_PARENT_PROCESS) == TRUE;
   if (!has_console) {
     // We weren't launched from a console, so just return.
     // We could alloc our own console, but meh:
     // has_console = AllocConsole() == TRUE;
+    _has_console = false;
     return;
   }
+  _has_console = true;
 
   auto std_handle = (intptr_t)GetStdHandle(STD_OUTPUT_HANDLE);
   auto con_handle = _open_osfhandle(std_handle, _O_TEXT);
@@ -100,6 +108,10 @@ int xe_main_window_thunk(
 
 #else
 
+bool xe_has_console() {
+  return _has_console;
+}
+
 int xe_main_thunk(
     int argc, char** argv,
     void* user_main, const char* usage) {

src/xenia/platform.h

@@ -134,6 +134,7 @@ XE_CPU:         32BIT | 64BIT | BIGENDIAN | LITTLEENDIAN
 #define XE_ALIGNMENT            16
 #endif  // 32BIT
 
+bool xe_has_console();
 #if XE_LIKE_WIN32 && defined(UNICODE) && UNICODE
 int xe_main_thunk(
     int argc, wchar_t* argv[],

tools/xenia-run/xenia-run.cc

@@ -27,6 +27,7 @@ int xenia_run(int argc, xechar_t** argv) {
   // Grab path from the flag or unnamed argument.
   if (!FLAGS_target.size() && argc < 2) {
     google::ShowUsageWithFlags("xenia-run");
+    XEFATAL("Pass a file to launch.");
     return 1;
   }
   const xechar_t* path = NULL;
@@ -55,6 +56,7 @@ int xenia_run(int argc, xechar_t** argv) {
   const xechar_t* dot = xestrrchr(abs_path, '.');
   if (!dot) {
     XELOGE("Invalid input path; no extension found");
+    XEFATAL("Pass a valid file path to launch.");
     return 1;
   }
 
@@ -85,6 +87,9 @@ int xenia_run(int argc, xechar_t** argv) {
   result_code = 0;
 XECLEANUP:
   delete emulator;
+  if (result_code) {
+    XEFATAL("Failed to launch emulator: %d", result_code);
+  }
   return result_code;
 }
 XE_MAIN_WINDOW_THUNK(xenia_run, XETEXT("xenia-run"), "xenia-run some.xex");