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0:000> u sprintf
SHSMP64!sprintf [f:\dd\vctools\crt_bld\self_64_amd64\crt\src\sprintf.c @ 99]:
00000000`0a9122e4 4889542410      mov     qword ptr [rsp+10h],rdx
00000000`0a9122e9 4c89442418      mov     qword ptr [rsp+18h],r8
00000000`0a9122ee 4c894c2420      mov     qword ptr [rsp+20h],r9
00000000`0a9122f3 53              push    rbx
00000000`0a9122f4 4883ec60        sub     rsp,60h
00000000`0a9122f8 4885d2          test    rdx,rdx
00000000`0a9122fb 7525            jne     SHSMP64!sprintf+0x3e (00000000`0a912322)
00000000`0a9122fd e8821e0000      call    SHSMP64!_errno (00000000`0a914184)