Programming Forums > Application Development > C

BungalowBill · Dec 6th, 2005, 4:34 AM

Its cool, we all need help.

So whats the code for doing this?. If i wanted to set up the FAT. This is what i go so far.

void format(){

int j;
for(j=4; j<512; j++){
disk[1].FATdata[j] = unused;
}
int i;
for(i=0;i<512; i++){
disk[2].FATdata[i] = unused;
}

disk[1].Datablock[0] = data;
disk[1].FATblock[1] = FATdata;
disk[1].FATdata[2] = FATdata;
disk[1].Dirblock[3] = dirdata;
disk[1].Datablock[79] = data;
}

I have data, FATdata, and dirdata declared in a separate header file like this:-
typedef union Tdiskblock Diskblock;
union Tdiskblock{
Datablock data;
Dirblock dirdata;
FATblock FATdata;
};

but when i compile its saying that data, FATdata, and dirdata are not defined. BTW that 79 thing is just something extra i forgot to take out. Its saying that Datablock,Dirblock and FATblock are not members of Tdiskblock, but it looks like they are to me.
If you haven't guessed, im a complete newbie with this so don't be too harsh.

thanks

DaWei · Dec 6th, 2005, 5:54 AM

Read the forum's FAQ/rules. Put your code inside code tags.

BungalowBill · Dec 6th, 2005, 6:41 AM

sorry. will do next time. I have another question now though. If i had some data in a random block like:-

(Toggle Plain Text)

strcpy((char*)disk[79].data, "Tommorrow Never Knows");

how would i use fopen() to open this. I'm stumped.

nnxion · Dec 6th, 2005, 10:11 AM

Your question stumped me

But really, what is it you want to open?

BungalowBill · Dec 6th, 2005, 12:33 PM

If meant if i stored that on disk, that piece of text, how would i open it up - but don't worry, i got that sorted.

I figured out how to open that specific file, now all i have to do is write a generic method which opens any file i give to it in the parameters. like

(Toggle Plain Text)

(const char * path, const char*mode)

Ooble · Dec 6th, 2005, 1:23 PM

There's already one - it's called fopen.

nnxion · Dec 6th, 2005, 2:25 PM

If you want to create fopen again, then note that fopen is a high level function. You would be wise to make a low level function (first).

BungalowBill · Dec 7th, 2005, 5:19 AM

I've got a piece of code for myfopen.

(Toggle Plain Text)

Myfile * myfopen(){
Myfile * file = (Myfile*) malloc(sizeof (Myfile));
memmove(file->buffer.data, disk[79].data, blocksize);
file->pos = 0;
return file;

that gets whatever is in diskblock 79. How would i change that to make it get the data from any postion the user selects? i.e.

(Toggle Plain Text)

Myfile * myfopen(const *char path, const char * mode){
Myfile * file = (Myfile*) malloc(sizeof (Myfile));
memmove(file->buffer.data, (path,mode) blocksize);
file->pos = 0;
return file;

but that doesn't work. Does anyone know the answer to this? i need something instead of the bit in bold. Cheers for any help.

Dec 6th, 2005, 4:34 AM	#11
BungalowBill Programmer Join Date: Dec 2005 Posts: 40 Rep Power: 0	Its cool, we all need help. So whats the code for doing this?. If i wanted to set up the FAT. This is what i go so far. void format(){ int j; for(j=4; j<512; j++){ disk[1].FATdata[j] = unused; } int i; for(i=0;i<512; i++){ disk[2].FATdata[i] = unused; } disk[1].Datablock[0] = data; disk[1].FATblock[1] = FATdata; disk[1].FATdata[2] = FATdata; disk[1].Dirblock[3] = dirdata; disk[1].Datablock[79] = data; } I have data, FATdata, and dirdata declared in a separate header file like this:- typedef union Tdiskblock Diskblock; union Tdiskblock{ Datablock data; Dirblock dirdata; FATblock FATdata; }; but when i compile its saying that data, FATdata, and dirdata are not defined. BTW that 79 thing is just something extra i forgot to take out. Its saying that Datablock,Dirblock and FATblock are not members of Tdiskblock, but it looks like they are to me. If you haven't guessed, im a complete newbie with this so don't be too harsh. thanks Last edited by BungalowBill; Dec 6th, 2005 at 4:49 AM.

Dec 6th, 2005, 5:54 AM	#12
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Read the forum's FAQ/rules. Put your code inside code tags. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Dec 6th, 2005, 6:41 AM	#13
BungalowBill Programmer Join Date: Dec 2005 Posts: 40 Rep Power: 0	sorry. will do next time. I have another question now though. If i had some data in a random block like:- (Toggle Plain Text) strcpy((char)disk[79].data, "Tommorrow Never Knows"); strcpy((char)disk[79].data, "Tommorrow Never Knows"); how would i use fopen() to open this. I'm stumped.

Dec 6th, 2005, 10:11 AM	#14
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	Your question stumped me But really, what is it you want to open? __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Dec 6th, 2005, 12:33 PM	#15
BungalowBill Programmer Join Date: Dec 2005 Posts: 40 Rep Power: 0	If meant if i stored that on disk, that piece of text, how would i open it up - but don't worry, i got that sorted. I figured out how to open that specific file, now all i have to do is write a generic method which opens any file i give to it in the parameters. like (Toggle Plain Text) (const char * path, const charmode) (const char path, const char*mode)

Dec 6th, 2005, 1:23 PM	#16
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 9	There's already one - it's called fopen. __________________ Me :: You :: Them

Dec 6th, 2005, 2:25 PM	#17
nnxion Programming Guru Join Date: Jun 2005 Location: elemental plane Posts: 1,429 Rep Power: 5	If you want to create fopen again, then note that fopen is a high level function. You would be wise to make a low level function (first). __________________ "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others have labored hard for." -- Socrates

Dec 7th, 2005, 5:19 AM	#18
BungalowBill Programmer Join Date: Dec 2005 Posts: 40 Rep Power: 0	I've got a piece of code for myfopen. (Toggle Plain Text) Myfile * myfopen(){ Myfile * file = (Myfile) malloc(sizeof (Myfile)); memmove(file->buffer.data, disk[79].data, blocksize); file->pos = 0; return file; Myfile myfopen(){ Myfile * file = (Myfile) malloc(sizeof (Myfile)); memmove(file->buffer.data, disk[79].data, blocksize); file->pos = 0; return file; that gets whatever is in diskblock 79. How would i change that to make it get the data from any postion the user selects? i.e. (Toggle Plain Text) Myfile myfopen(const char path, const char mode){ Myfile * file = (Myfile) malloc(sizeof (Myfile)); memmove(file->buffer.data, (path,mode)* blocksize); file->pos = 0; return file; Myfile * myfopen(const char path, const char mode){ Myfile * file = (Myfile*) malloc(sizeof (Myfile)); memmove(file->buffer.data, (path,mode) blocksize); file->pos = 0; return file; but that doesn't work. Does anyone know the answer to this? i need something instead of the bit in bold. Cheers for any help.

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Programming Forums > Application Development > C

FAT creation