Printf without newline in assembly

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fflush() flushes buffered output in line or full-buffered stdio streams:

extern fflush
...
xor  edi, edi          ; RDI = 0
call fflush            ; fflush(NULL) flushes all streams
...

Alternatively, mov rdi, [stdout] / call fflush also works to flush only that stream. (Use default rel for efficient RIP-relative addressing, and you’ll need extern stdout as well.)

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