benknoble / echocho

🚂POSIX, BSD, XSI, and SystemV echo

Implementations of echo(1)

Based on the Open Group POSIX specification.

Why?

• For fun
• For sysadmins who need strictly compatible versions of echo
• For someone who just "wants echo to work, damnit"
• For reference
• To demonstrate the difficulty of POSIX echo(1)

Compiling

Build binaries with a POSIX-compatible make(1). Individual targets are provided for the implementations listed below.

Supported Implementations

• POSIX
• BSD
• XSI
• SystemV

Bugs

• No account for environment variables, e.g., LANG and LC_*
• Limited error checking
• No make(1) support for installation, out-of-source building, documentation
• No tests
• No documentation

If you find a bug, particularly in the implementation of the POSIX standard, please file an issue.

echocho's Issues

xsi \0 terminates the args rather than outputting a null char

This is because I failed to follow the spec to a t (and assumed the printf family would just work).

I will probably convert the escapes to use fwrite(3).