X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=saveresume.c;h=889794596ae2325e8500e909e7765f9f567b0a32;hb=36f72f190259b3ff72a87d1e888a578d6fd5b8da;hp=276667d1f2a661d21e56760b281c21d5f7f65711;hpb=73278b1a3c6535edba5076ab1750e609a76325f2;p=open-adventure.git

diff --git a/saveresume.c b/saveresume.c
index 276667d..8897945 100644
--- a/saveresume.c
+++ b/saveresume.c
@@ -36,7 +36,7 @@ int savefile(FILE *fp, long version)
     save.mode = -1;
     save.version = (version == 0) ? VRSION : version;
 
-    memcpy(&save.game, &game, sizeof(struct game_t));
+    save.game = game;
     IGNORE(fwrite(&save, sizeof(struct save_t), 1, fp));
     return (0);
 }
@@ -85,7 +85,8 @@ int resume(void)
 #endif
     FILE *fp = NULL;
 
-    if (game.loc != 1 || game.abbrev[1] != 1) {
+    if (game.loc != 1 ||
+        game.abbrev[1] != 1) {
         rspeak(RESUME_ABANDON);
         if (!yes(arbitrary_messages[THIS_ACCEPTABLE], arbitrary_messages[OK_MAN], arbitrary_messages[OK_MAN]))
             return GO_CLEAROBJ;
@@ -104,6 +105,8 @@ int resume(void)
     return restore(fp);
 }
 
+bool is_valid(struct game_t);
+
 int restore(FILE* fp)
 {
     /*  Read and restore game state from file, assuming
@@ -117,10 +120,32 @@ int restore(FILE* fp)
     fclose(fp);
     if (save.version != VRSION) {
         rspeak(VERSION_SKEW, save.version / 10, MOD(save.version, 10), VRSION / 10, MOD(VRSION, 10));
-    } else {
-        memcpy(&game, &save.game, sizeof(struct game_t));
+    } else if (is_valid(save.game)) {
+        game = save.game;
     }
     return GO_TOP;
 }
 
-/* end */
+bool is_valid(struct game_t valgame)
+{
+    /*  Save files can be roughly grouped into three groups:
+     *  With valid, reaceable state, with valid, but unreachable
+     *  state and with invaild state. We check that state is
+     *  valid: no states are outside minimal or maximal value
+     */
+
+    /*  Bounds check for locations
+     */
+    if ( valgame.chloc < -1  || valgame.chloc > NLOCATIONS  ||
+         valgame.chloc < -1  || valgame.chloc > NLOCATIONS  ||
+         valgame.loc < -1    || valgame.loc > NLOCATIONS    ||
+         valgame.newloc < -1 || valgame.newloc > NLOCATIONS ||
+         valgame.oldloc < -1 || valgame.oldloc > NLOCATIONS ||
+         valgame.oldloc < -1 || valgame.oldloc > NLOCATIONS) {
+        return false;
+    }
+
+    return true;
+}
+
+/* end */
\ No newline at end of file