Syscall alternative for printf()? [closed]

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A question about syscalls needs to be in the context of a particular implementation (OS/kernel), since the very concept of syscalls is not universal but implementation-specific, and many operating systems do not even have them as a stable public interface you can use from applications. I’m going to assume you’re asking about Linux where the question has the greatest chance of making sense.

So to answer your question, there is no such syscall. Syscalls are generally for performing input and output, changing the state of a process, and performing other operations that require crossing privilege domains or process contexts. It’s rare for a syscall to exist to perform a task which is purely computational, and converting a format string plus a number of arguments corresponding to the format specifiers into a sequence of bytes is purely computational.

If you’re willing to write the code to do the formatting yourself, you can of course write the output via the write syscall.

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