add a buffering write function for program.
add a buffering write function for program.

dbkaplun/blessed,anko/blessed,zBMNForks/blessed,bulkan/blessed,chjj/blessed,bulkan/blessed,rstr74/blessed,yaronn/blessed,eush77/blessed,eush77/blessed,mcanthony/blessed,piranna/blessed,yaronn/blessed,dbkaplun/blessed,gdseller/blessed,mcanthony/blessed,gdseller/blessed,anko/blessed,chjj/blessed,rosshinkley/blessed,rstr74/blessed,umi/blessed,rosshinkley/blessed,umi/blessed,piranna/blessed,zBMNForks/blessed