alec/erythros
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

System/Setup/Util: Add FifoU8Last()

Browse source
This commit is contained in:
Alec Murphy 2025-04-25 09:58:18 -04:00
parent e827f52c51
commit dc14bc4dd8
1 changed files with 19 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

19
System/Setup/Util.HC
View file

@ -148,3 +148,22 @@ I64 @t(Bool _condition, I64 _true, I64 _false)
}
U0 dd() { DocDump(adam_task->put_doc); }
Bool FifoU8Last(CFifoU8* f, U8* _b)
{ // Peek at back of fifo and don't remove.
PUSHFD
CLI if (f->in_ptr == f->out_ptr)
{
POPFD
return FALSE;
}
else
{
I64 last_ptr = f->in_ptr - 1;
if (last_ptr < 0)
last_ptr = FifoU8Cnt(f) - 1;
*_b = f->buf[last_ptr];
POPFD
return TRUE;
}
}