Use C++ style comments consistently in SDL source code

Implemented using this script:

find . -type f -exec sed -i'' -e 's,/\* *\([^*]*\)\*/ *$,// \1,' -e 's, \+$,,' {} \;
git checkout \
    core/linux/SDL_evdev_kbd_default_keymap.h \
    events/imKStoUCS.* \
    hidapi \
    joystick/controller_type.c \
    joystick/controller_type.h \
    joystick/hidapi/steam/controller_constants.h \
    joystick/hidapi/steam/controller_structs.h \
    joystick/SDL_gamepad_db.h \
    libm \
    render/*/*Shader*.h \
    render/vitagxm/SDL_render_vita_gxm_shaders.h \
    render/metal/SDL_shaders_metal_*.h \
    stdlib/SDL_malloc.c \
    stdlib/SDL_qsort.c \
    stdlib/SDL_strtokr.c \
    test/ \
    video/directx/SDL_d3d12_xbox_cmacros.h \
    video/directx/d3d12.h \
    video/directx/d3d12sdklayers.h \
    video/khronos \
    video/x11/edid-parse.c \
    video/x11/xsettings-client.* \
    video/yuv2rgb
sed -i'' -e 's,/\* *\([^*]*\)\*/ *$,// \1,' -e 's, \+$,,' hidapi/SDL_hidapi.c

src/misc/ios/SDL_sysurl.m

@@ -40,4 +40,4 @@ int SDL_SYS_OpenURL(const char *url)
     }
 }
 
-#endif /* SDL_PLATFORM_IOS || SDL_PLATFORM_TVOS */
+#endif // SDL_PLATFORM_IOS || SDL_PLATFORM_TVOS

src/misc/macos/SDL_sysurl.m

@@ -36,4 +36,4 @@ int SDL_SYS_OpenURL(const char *url)
     }
 }
 
-#endif /* SDL_PLATFORM_MACOS */
+#endif // SDL_PLATFORM_MACOS

src/misc/unix/SDL_sysurl.c

@@ -36,34 +36,34 @@ extern char **environ;
 int SDL_SYS_OpenURL(const char *url)
 {
     const pid_t pid1 = fork();
-    if (pid1 == 0) { /* child process */
+    if (pid1 == 0) { // child process
 #ifdef USE_POSIX_SPAWN
         pid_t pid2;
         const char *args[] = { "xdg-open", url, NULL };
-        /* Clear LD_PRELOAD so Chrome opens correctly when this application is launched by Steam */
+        // Clear LD_PRELOAD so Chrome opens correctly when this application is launched by Steam
         unsetenv("LD_PRELOAD");
         if (posix_spawnp(&pid2, args[0], NULL, NULL, (char **)args, environ) == 0) {
-            /* Child process doesn't wait for possibly-blocking grandchild. */
+            // Child process doesn't wait for possibly-blocking grandchild.
             _exit(EXIT_SUCCESS);
         } else {
             _exit(EXIT_FAILURE);
         }
 #else
         pid_t pid2;
-        /* Clear LD_PRELOAD so Chrome opens correctly when this application is launched by Steam */
+        // Clear LD_PRELOAD so Chrome opens correctly when this application is launched by Steam
         unsetenv("LD_PRELOAD");
-        /* Notice this is vfork and not fork! */
+        // Notice this is vfork and not fork!
         pid2 = vfork();
-        if (pid2 == 0) { /* Grandchild process will try to launch the url */
+        if (pid2 == 0) { // Grandchild process will try to launch the url
             execlp("xdg-open", "xdg-open", url, NULL);
             _exit(EXIT_FAILURE);
-        } else if (pid2 < 0) { /* There was an error forking */
+        } else if (pid2 < 0) { // There was an error forking
             _exit(EXIT_FAILURE);
         } else {
-            /* Child process doesn't wait for possibly-blocking grandchild. */
+            // Child process doesn't wait for possibly-blocking grandchild.
             _exit(EXIT_SUCCESS);
         }
-#endif /* USE_POSIX_SPAWN */
+#endif // USE_POSIX_SPAWN
     } else if (pid1 < 0) {
         return SDL_SetError("fork() failed: %s", strerror(errno));
     } else {
@@ -71,7 +71,7 @@ int SDL_SYS_OpenURL(const char *url)
         if (waitpid(pid1, &status, 0) == pid1) {
             if (WIFEXITED(status)) {
                 if (WEXITSTATUS(status) == 0) {
-                    return 0; /* success! */
+                    return 0; // success!
                 } else {
                     return SDL_SetError("xdg-open reported error or failed to launch: %d", WEXITSTATUS(status));
                 }

src/misc/windows/SDL_sysurl.c

@@ -28,17 +28,17 @@
 #if defined(SDL_PLATFORM_XBOXONE) || defined(SDL_PLATFORM_XBOXSERIES)
 int SDL_SYS_OpenURL(const char *url)
 {
-    /* Not supported */
+    // Not supported
     return SDL_Unsupported();
 }
 #else
-/* https://msdn.microsoft.com/en-us/library/windows/desktop/bb762153%28v=vs.85%29.aspx */
+// https://msdn.microsoft.com/en-us/library/windows/desktop/bb762153%28v=vs.85%29.aspx
 int SDL_SYS_OpenURL(const char *url)
 {
     WCHAR *wurl;
     HINSTANCE rc;
 
-    /* MSDN says for safety's sake, make sure COM is initialized. */
+    // MSDN says for safety's sake, make sure COM is initialized.
     const HRESULT hr = WIN_CoInitialize();
     if (FAILED(hr)) {
         return WIN_SetErrorFromHRESULT("CoInitialize failed", hr);
@@ -50,7 +50,7 @@ int SDL_SYS_OpenURL(const char *url)
         return -1;
     }
 
-    /* Success returns value greater than 32. Less is an error. */
+    // Success returns value greater than 32. Less is an error.
     rc = ShellExecuteW(NULL, L"open", wurl, NULL, NULL, SW_SHOWNORMAL);
     SDL_free(wurl);
     WIN_CoUninitialize();