os.get_raw_stdin() truncates binary input at the first newline byte

[hunterjsb]

Summary

os.get_raw_stdin() is documented/intended to read all of stdin as raw bytes, but it stops at the first newline (0x0A) — so any binary payload containing a newline byte is silently truncated. "Raw" reads should be line-agnostic.

Reproduction

import os

fn main() {
	b := os.get_raw_stdin()
	println('read ${b.len} bytes')
}

$ printf 'AB\nCDE' | v run rawstdin.v
read 3 bytes        # expected: read 6 bytes

The input is 6 bytes (A B \n C D E); get_raw_stdin returns 3 (A B \n), discarding everything after the first newline.

Expected

All 6 bytes. get_raw_stdin should read to EOF regardless of newline bytes — that's the point of a raw read versus line-based input.

Impact

Silent data corruption for any binary data piped through stdin — protobuf/msgpack/image/compressed payloads routinely contain 0x0A. The failure is silent (no error), which makes it especially easy to ship.

Environment

V 0.5.2 5889122, Linux x86_64.

Note

Hit while piping encoded protobuf through stdin; worked around by reading from a file. Filing on the fork to track for upstream.