printf: avoid panic on integer precision above u16::MAX#12579
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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printf "%.100000d" 1panics with "Formatting argument out of range" because the integer formatters feed the precision intoformat!("{:0>width$}"), and Rust's formatting machinery rejects a dynamic width/precision aboveu16::MAX. GNU prints the zero-padded number instead, so a large precision is valid input that should not crash.This zero-pads the digits manually for the signed and unsigned integer paths, which removes the limit while keeping the existing output. Added a regression test that fails on the current code.
Fixes #12572.