Show size of SD and flashcards in [root] menu

Credit to @JeffRuLz for the printBytes code and size grabbing code from TMFH

arm9/source/driveMenu.cpp

@@ -30,6 +30,7 @@
 #include "date.h"
 #include "screenshot.h"
 #include "driveOperations.h"
+#include "fileOperations.h"
 
 #define SCREEN_COLS 32
 #define ENTRIES_PER_SCREEN 22
@@ -216,13 +217,17 @@ void dm_drawBottomScreen(void) {
 		if (sdLabel[0] != '\0') {
 			iprintf (" (%s)", sdLabel);
 		}
-		printf ("\n(SD FAT)");
+		printf ("\n(SD FAT, ");
+		printBytes(sdSize);
+		printf(")");
 	} else if (dmAssignedOp[dmCursorPosition] == 1) {
 		printf ("[fat:] FLASHCART");
 		if (fatLabel[0] != '\0') {
 			iprintf (" (%s)", fatLabel);
 		}
-		printf ("\n(Slot-1 SD FAT)");
+		printf ("\n(Slot-1 SD FAT, ", fatSize);
+		printBytes(fatSize);
+		printf(")");
 	} else if (dmAssignedOp[dmCursorPosition] == 2) {
 		printf ("GBA GAMECART\n");
 		printf ("(GBA Game)");

arm9/source/driveOperations.cpp

@@ -2,6 +2,7 @@
 #include <nds/arm9/dldi.h>
 #include <fat.h>
 #include <sys/stat.h>
+#include <sys/statvfs.h>
 #include <stdio.h>
 
 #include "main.h"
@@ -24,6 +25,9 @@ bool nitroSecondaryDrive = false;			// false == SD card, true == Flashcard
 char sdLabel[12];
 char fatLabel[12];
 
+int sdSize = 0;
+int fatSize = 0;
+
 void fixLabel(bool fat) {
 	if (fat) {
 		for (int i = 0; i < 12; i++) {
@@ -76,6 +80,10 @@ TWL_CODE bool sdMount(void) {
 		sdMountedDone = true;
 		fatGetVolumeLabel("sd", sdLabel);
 		fixLabel(false);
+		struct statvfs st;
+		if (statvfs("sd:/", &st) == 0) {
+			sdSize = st.f_bsize * st.f_blocks;
+		}
 		return true;
 	}
 	return false;
@@ -84,6 +92,7 @@ TWL_CODE bool sdMount(void) {
 TWL_CODE void sdUnmount(void) {
 	fatUnmount("sd");
 	sdLabel[0] = '\0';
+	sdSize = 0;
 	sdMounted = false;
 }
 
@@ -210,6 +219,10 @@ TWL_CODE bool twl_flashcardMount(void) {
 		if (flashcardFound()) {
 			fatGetVolumeLabel("fat", fatLabel);
 			fixLabel(true);
+			struct statvfs st;
+			if (statvfs("fat:/", &st) == 0) {
+				fatSize = st.f_bsize * st.f_blocks;
+			}
 			return true;
 		}
 	}
@@ -222,6 +235,10 @@ bool flashcardMount(void) {
 		if (flashcardFound()) {
 			fatGetVolumeLabel("fat", fatLabel);
 			fixLabel(true);
+			struct statvfs st;
+			if (statvfs("fat:/", &st) == 0) {
+				fatSize = st.f_bsize * st.f_blocks;
+			}
 			return true;
 		}
 		return false;
@@ -233,5 +250,6 @@ bool flashcardMount(void) {
 void flashcardUnmount(void) {
 	fatUnmount("fat");
 	fatLabel[0] = '\0';
+	fatSize = 0;
 	flashcardMounted = false;
 }

arm9/source/driveOperations.h

@@ -14,6 +14,9 @@ extern bool nitroSecondaryDrive;		// false == SD card, true == Flashcard
 extern char sdLabel[12];
 extern char fatLabel[12];
 
+extern int sdSize;
+extern int fatSize;
+
 extern bool sdFound(void);
 extern bool flashcardFound(void);
 extern bool bothSDandFlashcard(void);

arm9/source/fileOperations.cpp

@@ -20,6 +20,21 @@ bool clipboardUsed = false;
 bool clipboardDrive = false;	// false == SD card, true == Flashcard
 bool clipboardInNitro = false;
 
+void printBytes(int bytes)
+{
+	if (abs(bytes) < 1024)
+		iprintf("%d B", bytes);
+
+	else if (abs(bytes) < 1024 * 1024)
+		printf("%.1f KB", (float)bytes / 1024);
+
+	else if (abs(bytes) < 1024 * 1024 * 1024)
+		printf("%.1f MB", (float)bytes / 1024 / 1024);
+
+	else
+		printf("%.1f GB", (float)bytes / 1024 / 1024 / 1024);
+}
+
 off_t getFileSize(const char *fileName)
 {
     FILE* fp = fopen(fileName, "rb");

arm9/source/fileOperations.h

@@ -11,6 +11,8 @@ extern bool clipboardUsed;
 extern bool clipboardDrive;	// false == SD card, true == Flashcard
 extern bool clipboardInNitro;
 
+extern void printBytes(int bytes);
+
 extern off_t getFileSize(const char *fileName);
 extern int fcopy(const char *sourcePath, const char *destinationPath);