i just fount thers strstr in ntdll.
as well as sprintf, strcpy and rest *crt functions.

But there are also equivalents: memset -> RtlFillMemory, and rest of Rtl's

but string functions are still cdecl =(
Can i find then somewere in stdcall version?

kernel32.dll has the string functions, all but wsprintf are stdcall. And the best part is they are documented, so no need to go messing with unknown interfaces.

or you can try fasmlib.x86asm.net for more ASMy interface (stdcall even for vararg functions, for example)

vid, i can write all functions myself, point of calling memset, strstr, etc is to make my code smaller. Adding external lib will make it huge!

okay then... what for do you want so small code? just as excercise?

small, faster = better.
also better knowleadge, im gona write my own os, in future...

and better cash if i write something for $

many ppl write programs just hoping it will work, i dont want be like everyone. work - fine, no bugs, small and fast = excellent.

20KB doesn't make difference.

20kb isnt much?!
im counting every single byte to avoid off-by-one, it may be irritating to remember that [ebp+322] is pointer to structure, [ebp+24]...[ebp+56] are socket descriptors and [ebp] is buffer wich has only 24 bytes, esi = buffer [ebp+60] and ebx is open process handle. But only at begginning, day by day its easier, and after few months you count it automaticly, its fun!

extra 20KB doesn't make your code noticeably slower, so your argumentation doesn't apply.