[Toybox] [patch] add grep

[felix.janda at posteo.de]

Just three superficial remarks:

The *error_[msg,exit] functions should be used instead of [err,warn]x 
from err.h. These functions use xexit() instead of exit(). In xexit() 
calls exit() unless toys.rebound nonzero (e.g. when invoked from toysh) 
and in this case it long_jmps to toys.rebound.

The global variable c seems to have a similar purpose as toys.exitval. 
Is it necessary?

> +void grep_main (void) {
> +  buildRE ();
> +
> +  if (toys.optflags & FLAG_c) TT.mode = 'c';
> +  if (toys.optflags & FLAG_l) TT.mode = 'l';
> +  if (toys.optflags & FLAG_q) TT.mode = 'q';
> +
> +  if (toys.optc > 0) loopfiles (toys.optargs, do_grep);
> +  else do_grep (0, "-");

loopfiles() already deals with "-".

Felix

 1374070810.0