Sync save sector checks

include/global.h

@@ -129,6 +129,10 @@ extern u8 gStringVar4[];
 #define NUM_FLAG_BYTES ROUND_BITS_TO_BYTES(FLAGS_COUNT)
 #define NUM_ADDITIONAL_PHRASE_BYTES ROUND_BITS_TO_BYTES(NUM_ADDITIONAL_PHRASES)
 
+// This produces an error at compile-time if expr is zero.
+// It looks like file.c:line: size of array `id' is negative
+#define STATIC_ASSERT(expr, id) typedef char id[(expr) ? 1 : -1];
+
 struct Coords8
 {
     s8 x;

include/save.h

@@ -9,7 +9,10 @@
 #define SECTOR_FOOTER_SIZE 128
 #define SECTOR_SIZE (SECTOR_DATA_SIZE + SECTOR_FOOTER_SIZE)
 
-#define FILE_SIGNATURE 0x08012025  // signature value to determine if a sector is in use
+#define NUM_SAVE_SLOTS 2
+
+// If the sector's signature field is not this value then the sector is either invalid or empty.
+#define SECTOR_SIGNATURE 0x08012025
 
 #define SPECIAL_SECTOR_SENTINEL 0xB39D
 
@@ -26,12 +29,19 @@
 #define SECTOR_ID_TRAINER_TOWER_2    31
 #define SECTORS_COUNT                32
 
+#define NUM_HOF_SECTORS 2
+
 #define SAVE_STATUS_EMPTY    0
 #define SAVE_STATUS_OK       1
 #define SAVE_STATUS_INVALID  2
 #define SAVE_STATUS_NO_FLASH 4
 #define SAVE_STATUS_ERROR    0xFF
 
+// Special sector id value for certain save functions
+// to indicate that all sectors should be used
+// instead of a specific sector.
+#define FULL_SAVE_SLOT 0xFFFF
+
 enum
 {
     SAVE_NORMAL,
@@ -58,16 +68,11 @@ struct SaveSector
     u16 checksum;
     u32 signature;
     u32 counter;
-}; // size is 0x1000
+}; // size is SECTOR_SIZE (0x1000)
 
 #define SECTOR_SIGNATURE_OFFSET offsetof(struct SaveSector, signature)
 #define SECTOR_COUNTER_OFFSET   offsetof(struct SaveSector, counter)
 
-// Special sector id value for certain save functions
-// to indicate that all sectors should be used
-// instead of a specific sector.
-#define FULL_SAVE_SLOT 0xFFFF
-
 // operations for SetDamagedSectorBits
 enum
 {