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How to pass the password to su/sudo/ssh without overriding the TTY?

I'm writing a C Shell program that will be doing su or sudo or ssh. They all want their passwords in console input (the TTY) rather than stdin or the command line.

Does anybody know a solution?

Setting up password-less sudo is not an option.

expect could be an option, but it's not present on my stripped-down system.

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Pseudo-terminal will not be allocates because stdin is not a terminal
– Shilgen
Commented Nov 28, 2022 at 11:01

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How to pass the password to su/sudo/ssh without overriding the TTY?

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