Lua script:
i=io.read()
print(i)
Command line:
echo -e "sala\x00m" | lua ll.lua
Output:
sala
I want it to print all character from input, similar to this:
salam
in HEX editor:
0000000: 7361 6c61 006d 0a sala.m.
How can I print all character from input?
You tripped over one of the few places where the Lua standard library is still not 8-bit-clean.
Specifically, file reading line-by-line is not embedded-0 proof.
The reason it isn't yet is an unfortunate combination of:
- Only standard C90 or equally portable constructs are allowed for the core, which does not provide for efficient 0-clean text parsing.
- Every solution discussed to date on the mailinglist under that constraint has considerable overhead.
- Embedded 0-bytes in text files are quite rare.
Workarounds:
- Use a modified library, fixing these formats:
"*l" "*L" for file:read(...)
- parse your raw data yourself. (read a block using a number or as much as possible using
"*a")
- Badger the Lua developers/maintainers for a bugfix until they give in.
