Homebrew I need help.

[ItsKaitlyn03]

So I'm trying to read a 4MB (4,000,000 bytes) binary file into a struct like so

typedef struct boardData {
  unsigned char board[1024*1024*4];
} board;

int main(int argc, char **argv) {

    gfxInitDefault();
    consoleInit(GFX_TOP, NULL);

  struct boardData board;

  FILE *fpr = fopen("romfs:/boarddata", "r");
  if(fpr != NULL)
  {
    printf(":O");
    fread(&board, 1, 2000, fpr);
    fclose(fpr);
  }

but no matter what I do it just crashes on everything?

 

[Paccc]

You put 4 MB on the stack,
so if you did not specifically increase the stack of your process to 4 MB it will overflow into the memory of something else.
Try to allocate memory instead.

 

[NexoCube]

Pacc is right, try to alloc linear memory, the linear heap is damn big

 

[ItsKaitlyn03]

malloc(1024*1024*9); = still nothing

 

[NexoCube]

malloc(1024*1024*9); = still nothing

unsigned char *dick_allocation;
dick_allocation = linearAlloc(1024*1024*4);
fread(dick_allocation, ...);

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Edited my last post lol

 

[ItsKaitlyn03]

DOOD HOLY FUCK THAT WORKED but why isnt board working now

 

[NexoCube]

DOOD HOLY FUCK THAT WORKED but why isnt board working now

You need to modify the way you define your struct

typedef struct BoardData {
unsigned char *board_text;
} BoardData;

BoardData *board = linearAlloc(4); // size of a pointer
board->board_text = linearAlloc(1024*1024*4);

// fopen
...
fread(board->board_text, ...);
...

 

[ItsKaitlyn03]

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fixed board text but above error is still happening

 

[Wolfvak]

BoardData *board = linearAlloc(4); // size of a pointer

Allocating pointers in dynamic memory is somewhat useless tbqh, they're only 4 or 8 bytes and we get 32KiB of stack with ctrulib (obviously changeable).

To OP, I'd recommend reading a book or two on C/C++ and dynamic memory usage. It seems like you have no idea what you're doing (don't worry, we all start somewhere...)

 

[ItsKaitlyn03]

it appears that im still getting memory errors

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Fixed it by putting board data on sd..

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hrm... fixed all of it but this happens when i wanna do printf("%d\n", board->board[0+0*2000]);

 

[NexoCube]

Allocating pointers in dynamic memory is somewhat useless tbqh, they're only 4 or 8 bytes and we get 32KiB of stack with ctrulib (obviously changeable).

To OP, I'd recommend reading a book or two on C/C++ and dynamic memory usage. It seems like you have no idea what you're doing (don't worry, we all start somewhere...)

Yay, i went rude with someone in internet, my virtual girlfriend will be proud of me <3

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it appears that im still getting memory errorsView attachment 83908

--------------------- MERGED ---------------------------

Fixed it by putting board data on sd..

--------------------- MERGED ---------------------------

hrm... fixed all of it but this happens when i wanna do printf("%d\n", board->board[0+0*2000]);View attachment 83909

Printing text using printf is using "%s" not "%d"

And, 0+0*2000 = 0
You should use printf("%s", board->board_text); (because %s take a char pointer)