The R Project SVN R

#  File src/library/base/R/cat.R
#  Part of the R package, https://www.R-project.org
#
#  Copyright (C) 1995-2012 The R Core Team
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  A copy of the GNU General Public License is available at
#  https://www.R-project.org/Licenses/

cat <- function(..., file = "", sep = " ", fill = FALSE,
                labels = NULL, append = FALSE)
{
    if(is.character(file))
        if(file == "") file <- stdout()
        else if(startsWith(file, "|")) {
            file <- pipe(substring(file, 2L), "w")
            on.exit(close(file))
        } else {
            file <- file(file, ifelse(append, "a", "w"))
            on.exit(close(file))
        }
    .Internal(cat(list(...), file, sep, fill, labels, append))
}