From 62754039079c0aa46c0face7304bd6059ac79c85 Mon Sep 17 00:00:00 2001
From: nfore <neilfore@hotmail.com>
Date: Sun, 1 Sep 2024 11:17:00 -0500
Subject: [PATCH] Add savestate info messagebox showing date/time modified

---
 command_event.c                          | 11 +--------
 libretro-common/file/file_path.c         | 23 ++++++++++++++++++
 libretro-common/include/file/file_path.h |  2 ++
 menu/menu_setting.c                      | 30 +++++++++++++++++++++++-
 retroarch.c                              | 15 ++++++++++++
 retroarch.h                              |  2 ++
 6 files changed, 72 insertions(+), 11 deletions(-)

diff --git a/command_event.c b/command_event.c
index 9f7928c681c9..53b828c9c3b1 100644
--- a/command_event.c
+++ b/command_event.c
@@ -689,17 +689,8 @@ static void event_main_state(unsigned cmd)
 {
    char *path = string_alloc(PATH_MAX_LENGTH);
    char *msg  = string_alloc(PATH_MAX_LENGTH);
-   global_t   *global   = global_get_ptr();
-   settings_t *settings = config_get_ptr();
 
-   if (settings->state_slot > 0)
-      snprintf(path, PATH_MAX_LENGTH, "%s%d",
-            global->savestate_name, settings->state_slot);
-   else if (settings->state_slot < 0)
-      snprintf(path, PATH_MAX_LENGTH, "%s.auto",
-            global->savestate_name);
-   else
-      strlcpy(path, global->savestate_name, PATH_MAX_LENGTH);
+   get_savestate_path(path);
 
    if (pretro_serialize_size())
    {
diff --git a/libretro-common/file/file_path.c b/libretro-common/file/file_path.c
index 2a66680271ee..694e1fe970e9 100644
--- a/libretro-common/file/file_path.c
+++ b/libretro-common/file/file_path.c
@@ -801,3 +801,26 @@ void fill_short_pathname_representation(char* out_rep,
    else
       strlcpy(out_rep,path_short, size);
 }
+
+time_t path_modified_time(char *path)
+{
+#ifdef _WIN32
+   FILETIME mtime;
+   ULARGE_INTEGER ularge;
+   HANDLE file = CreateFile(path, GENERIC_READ, FILE_SHARE_READ, NULL,
+         OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+
+   GetFileTime(file, NULL, NULL, &mtime);
+   CloseHandle(file);
+
+   ularge.LowPart  = mtime.dwLowDateTime;
+   ularge.HighPart = mtime.dwHighDateTime;
+
+   return (time_t)((ularge.QuadPart - 116444736000000000ULL) / 10000000ULL);
+#else
+   struct stat info;
+   stat(path, &info);
+
+   return info.st_mtime;
+#endif
+}
diff --git a/libretro-common/include/file/file_path.h b/libretro-common/include/file/file_path.h
index 63dcac3e39e5..59dc5fae2aa1 100644
--- a/libretro-common/include/file/file_path.h
+++ b/libretro-common/include/file/file_path.h
@@ -437,6 +437,8 @@ void fill_pathname_slash(char *path, size_t size);
 void fill_pathname_application_path(char *buf, size_t size);
 #endif
 
+time_t path_modified_time(char *path);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/menu/menu_setting.c b/menu/menu_setting.c
index 79693d1d1939..d020ded18eba 100644
--- a/menu/menu_setting.c
+++ b/menu/menu_setting.c
@@ -17,6 +17,7 @@
 
 #include <file/file_path.h>
 #include <file/config_file.h>
+#include <string/stdstring.h>
 
 #include "menu.h"
 #include "menu_input.h"
@@ -36,6 +37,7 @@
 #include "../preempt.h"
 #include "drivers/rgui.h"
 #include "../core_history.h"
+#include "../retroarch.h"
 
 #if defined(__CELLOS_LV2__)
 #include <sdk_version.h>
@@ -2601,7 +2603,7 @@ static rarch_setting_t setting_string_setting_options(enum setting_type type,
 }
 
 static INLINE void setting_get_dl_core_info(char *s, size_t len,
-                                            const char* path)
+      const char* path)
 {
    global_t *global = global_get_ptr();
    char key[NAME_MAX_LENGTH];
@@ -2611,6 +2613,28 @@ static INLINE void setting_get_dl_core_info(char *s, size_t len,
       snprintf(s, len, "-- No description available for this core --");
 }
 
+static void setting_get_savestate_info(char *s, size_t len)
+{
+   char       *path     = string_alloc(PATH_MAX_LENGTH);
+   settings_t *settings = config_get_ptr();
+
+   get_savestate_path(path);
+
+   if (path_exists(path))
+   {
+      time_t mtime = path_modified_time(path);
+      char buf[32];
+
+      strftime(buf, 32, "%b %d %Y %H:%M:%S", localtime(&mtime));
+      snprintf(s, len, "State %i date/time modified:\n%s",
+            settings->state_slot, buf);
+   }
+   else
+      snprintf(s, len, "State %i is empty", settings->state_slot);
+
+   free(path);
+}
+
 static int setting_get_description_compare_label(uint32_t label_hash,
       settings_t *settings, char *s, size_t len,
       const char *path, unsigned type, unsigned entry_idx)
@@ -3761,6 +3785,10 @@ static int setting_get_description_compare_label(uint32_t label_hash,
                      "content is running or if\n"
                      "file updates are disabled.");
             break;
+      case MENU_LABEL_SAVESTATE:
+      case MENU_LABEL_LOADSTATE:
+         setting_get_savestate_info(s, len);
+         break;
       default:
          return -1;
    }
diff --git a/retroarch.c b/retroarch.c
index 05c10ebb9f54..69828c542b7e 100644
--- a/retroarch.c
+++ b/retroarch.c
@@ -1552,3 +1552,18 @@ bool rarch_clear_all_thread_waits(unsigned clear_threads, void* data)
 
    return true;
 }
+
+void get_savestate_path(char *path)
+{
+   global_t   *global   = global_get_ptr();
+   settings_t *settings = config_get_ptr();
+
+   if (settings->state_slot > 0)
+      snprintf(path, PATH_MAX_LENGTH, "%s%d",
+            global->savestate_name, settings->state_slot);
+   else if (settings->state_slot < 0)
+      snprintf(path, PATH_MAX_LENGTH, "%s.auto",
+            global->savestate_name);
+   else
+      strlcpy(path, global->savestate_name, PATH_MAX_LENGTH);
+}
diff --git a/retroarch.h b/retroarch.h
index 91aae17c9712..b36b1657d6d1 100644
--- a/retroarch.h
+++ b/retroarch.h
@@ -167,6 +167,8 @@ int rarch_info_get_capabilities(enum rarch_capabilities type, char *s, size_t le
 
 bool rarch_clear_all_thread_waits(unsigned clear_threads, void* data);
 
+void get_savestate_path(char *path);
+
 #ifdef __cplusplus
 }
 #endif