tr1/savegame: fix crashes when changing save-slots live

Resolves #1954.

docs/tr1/CHANGELOG.md

@@ -3,6 +3,7 @@
 - fixed big font scale causing text overlaps in the graphics options (#1946)
 - fixed missing FMVs causing the game to go silent (#1931, regression from 4.6)
 - fixed game crashing when toggling the bilinear filter in passport (#1942, regression from 4.5)
+- fixed game crashing when changing the save slot with `/set` when in passport (#1954, regression from 4.2)
 
 ## [4.6](https://github.com/LostArtefacts/TRX/compare/tr1-4.5.1...tr1-4.6) - 2024-11-18
 - added support for wading, similar to TR2+ (#1537)

src/tr1/config.c

@@ -6,6 +6,7 @@
 #include "game/music.h"
 #include "game/output.h"
 #include "game/requester.h"
+#include "game/savegame.h"
 #include "game/shell.h"
 #include "game/sound.h"
 #include "global/vars.h"
@@ -211,6 +212,7 @@ void Config_Sanitize(void)
     CLAMP(
         g_Config.rendering.turbo_speed, CLOCK_TURBO_SPEED_MIN,
         CLOCK_TURBO_SPEED_MAX);
+    CLAMPL(g_Config.maximum_save_slots, 1);
     CLAMPL(g_Config.rendering.anisotropy_filter, 1.0);
     CLAMP(g_Config.rendering.wireframe_width, 1.0, 100.0);
 
@@ -223,8 +225,13 @@ void Config_ApplyChanges(void)
 {
     Music_SetVolume(g_Config.music_volume);
     Sound_SetMasterVolume(g_Config.sound_volume);
-    Requester_Shutdown(&g_SavegameRequester);
-    Requester_Init(&g_SavegameRequester, g_Config.maximum_save_slots);
+
+    if (Savegame_IsInitialised()) {
+        Savegame_Shutdown();
+        Savegame_Init();
+        Savegame_ScanSavedGames();
+    }
+
     Output_ApplyRenderSettings();
 }
 

src/tr1/game/option/option_passport.c

@@ -277,6 +277,7 @@ static void M_InitSaveRequester(int16_t page_num)
     } else {
         req->vis_lines = 12;
     }
+    req->vis_lines = MIN(req->max_items, req->vis_lines);
 
     // Title screen passport is at a different pitch.
     if (g_InvMode == INV_TITLE_MODE) {
@@ -298,6 +299,8 @@ static void M_RestoreSaveRequester(void)
     if (g_SavegameRequester.items_used == 0) {
         M_InitSaveRequester(m_PassportStatus.page);
     }
+
+    CLAMPG(g_SavegameRequester.requested, g_SavegameRequester.items_used - 1);
 }
 
 static void M_InitSelectLevelRequester(void)

src/tr1/game/requester.c

@@ -161,33 +161,41 @@ int32_t Requester_Display(REQUEST_INFO *req)
         req->moredown = NULL;
     }
 
-    for (int i = 0; i < line_qty; i++) {
-        if (!req->items[i].content) {
-            req->items[i].content = Text_Create(
-                0, line_one_off + req->line_height * i,
-                req->items[req->line_offset + i].content_text);
-            Text_CentreH(req->items[i].content, 1);
-            Text_AlignBottom(req->items[i].content, 1);
+    for (int32_t i = 0; i < line_qty; i++) {
+        REQUESTER_ITEM *const item = &req->items[i];
+
+        const int32_t j = req->line_offset + i;
+        if (j < 0 || j >= req->items_used) {
+            Text_RemoveBackground(item->content);
+            Text_RemoveOutline(item->content);
+            continue;
+        }
+        REQUESTER_ITEM *const row_item = &req->items[j];
+
+        if (item->content == NULL && row_item->content_text != NULL) {
+            item->content = Text_Create(
+                0, line_one_off + req->line_height * i, row_item->content_text);
+            Text_CentreH(item->content, 1);
+            Text_AlignBottom(item->content, 1);
         }
         if (req->line_offset + i == req->requested) {
             Text_AddBackground(
-                req->items[i].content,
-                req->pix_width - BOX_PADDING - 1 * BOX_BORDER, 0, 0, 0,
-                TS_REQUESTED);
-            Text_AddOutline(req->items[i].content, TS_REQUESTED);
+                item->content, req->pix_width - BOX_PADDING - 1 * BOX_BORDER, 0,
+                0, 0, TS_REQUESTED);
+            Text_AddOutline(item->content, TS_REQUESTED);
         } else {
-            Text_RemoveBackground(req->items[i].content);
-            Text_RemoveOutline(req->items[i].content);
+            Text_RemoveBackground(item->content);
+            Text_RemoveOutline(item->content);
         }
     }
 
     if (req->line_offset != req->line_old_offset) {
         for (int i = 0; i < line_qty; i++) {
-            if (req->items[i].content) {
+            REQUESTER_ITEM *const item = &req->items[i];
+            if (item->content != NULL) {
                 Text_ChangeText(
-                    req->items[i].content,
+                    item->content,
                     req->items[req->line_offset + i].content_text);
-                ;
             }
         }
     }

src/tr1/game/savegame.h

@@ -48,6 +48,7 @@ typedef struct {
 
 void Savegame_Init(void);
 void Savegame_Shutdown(void);
+bool Savegame_IsInitialised(void);
 
 void Savegame_InitCurrentInfo(void);
 

src/tr1/game/savegame/savegame.c

@@ -44,6 +44,7 @@ typedef struct {
     bool (*update_death_counters)(MYFILE *fp, GAME_INFO *game_info);
 } SAVEGAME_STRATEGY;
 
+static int32_t m_SaveSlots = 0;
 static uint16_t m_NewestSlot = 0;
 static SAVEGAME_INFO *m_SavegameInfo = NULL;
 
@@ -83,7 +84,7 @@ static void M_Clear(void)
         return;
     }
 
-    for (int i = 0; i < g_Config.maximum_save_slots; i++) {
+    for (int i = 0; i < m_SaveSlots; i++) {
         SAVEGAME_INFO *const savegame_info = &m_SavegameInfo[i];
         savegame_info->format = 0;
         savegame_info->counter = -1;
@@ -174,8 +175,8 @@ static void M_LoadPostprocess(void)
 
 void Savegame_Init(void)
 {
-    m_SavegameInfo =
-        Memory_Alloc(sizeof(SAVEGAME_INFO) * g_Config.maximum_save_slots);
+    m_SaveSlots = g_Config.maximum_save_slots;
+    m_SavegameInfo = Memory_Alloc(sizeof(SAVEGAME_INFO) * m_SaveSlots);
 }
 
 void Savegame_Shutdown(void)
@@ -184,6 +185,11 @@ void Savegame_Shutdown(void)
     Memory_FreePointer(&m_SavegameInfo);
 }
 
+bool Savegame_IsInitialised(void)
+{
+    return m_SavegameInfo != NULL;
+}
+
 void Savegame_ProcessItemsBeforeLoad(void)
 {
     for (int i = 0; i < g_LevelItemCount; i++) {
@@ -403,7 +409,7 @@ int32_t Savegame_GetLevelNumber(const int32_t slot_num)
 
 int32_t Savegame_GetSlotCount(void)
 {
-    return g_Config.maximum_save_slots;
+    return m_SaveSlots;
 }
 
 bool Savegame_IsSlotFree(const int32_t slot_num)
@@ -553,7 +559,7 @@ void Savegame_ScanSavedGames(void)
     g_SaveCounter = 0;
     g_SavedGamesCount = 0;
 
-    for (int i = 0; i < g_Config.maximum_save_slots; i++) {
+    for (int i = 0; i < m_SaveSlots; i++) {
         SAVEGAME_INFO *savegame_info = &m_SavegameInfo[i];
         const SAVEGAME_STRATEGY *strategy = &m_Strategies[0];
         while (strategy->format) {
@@ -598,6 +604,7 @@ void Savegame_ScanSavedGames(void)
 
     REQUEST_INFO *req = &g_SavegameRequester;
     Requester_ClearTextstrings(req);
+    Requester_Init(&g_SavegameRequester, Savegame_GetSlotCount());
 
     for (int i = 0; i < req->max_items; i++) {
         SAVEGAME_INFO *savegame_info = &m_SavegameInfo[i];