C programmers be like: i want a function with a short name and a looong body
java programmers will have a method called retrieveBlockFromCentralBlockAndCacheContents which just calls another method somewhere, c programmers will have a function called getblk and it's 1000 lines of triply nested for loops and fiddly logic
calling out past emily btw the function is too long to screenshot lol
![/*
* getblk returns the address of a block in a file
* given its relative address blk
* the address are returned in *r
* mode has to be one of:
* - GBREAD: this block will only be read
* - GBWRITE: this block will be written, but don't create it
* if it doesn't exist
* - GBCREATE: this block will be written, create it if necessary
* - GBOVERWR: like GBCREATE, but return an empty block if a dump
* would be necessary
* return value is 1 if the block existed, -1 on error
* a return value of 0 means the block did not exist
* this is only an error in case of GBREAD and GBWRITE
*/
int
getblk(Fs *fs, FLoc *L, Buf *bd, uvlong blk, uvlong *r, int mode)
{
uvlong k, l;
uvlong *loc;
int i, j, rc, prc;
Buf *b;
Dentry *d;
b = bd;
d = getdent(L, b);
if(d == nil){
dprint("getblk: dirent gone\n");
return -1;
}
if(blk < NDIRECT){
loc = &d->db[blk];
goto found;
}
blk -= NDIRECT;
l = 1;
for(i = 0; i < NINDIRECT; i++){
l *= OFFPERBLK;
if(blk](https://pbs.twimg.com/media/Fd6NWTVWQAI2Odh.png)
it's from the filesystem hjfs that i wrote for plan 9
getblk() was one of the worst functions i had ever written at the time, it took ages to get all the cornercases right, it ended up a dumping ground for a lot of functionality, it's really the core of the fs
it's wild that at the time i thought i had it all figured out and now i look back on it and all i can say is lmao :)
there was a reason why it's a single function rather than multiple but i think if C supported functions within functions it would have been much easier to write and i wouldn't have gotten myself tangled up in so much mess tbh
maybe in hindsight writing multiple functions and copy-pasting the common parts would have been a better idea though
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