R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> pathname <- tempfile()
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Local functions
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> writeString <- function(s, file) {
+   raw <- charToRaw(s)
+   writeBin(raw, con=file)
+   if (is.character(file)) {
+     # Sanity check
+     stopifnot(file.info(file)$size == length(raw))
+   }
+ } # writeString()
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Empty file
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> cat("", file=pathname)
> # Sanity check
> stopifnot(file.info(pathname)$size == 0L)
> 
> n <- countLines(pathname)
> stopifnot(n == 0L)
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # File with one line
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # File: Ending with a new line
> writeString("Hello world!\n", file=pathname)
> n <- countLines(pathname)
> stopifnot(n == 1L)
> 
> # File: Last line does not end with a new line
> writeString("Hello world!", file=pathname)
> n <- countLines(pathname)
> stopifnot(n == 1L)
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Files with multiple lines
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> bfr <- letters[1:9]
> 
> # File: All lines ending with a new line
> writeString(paste(c(bfr, ""), collapse="\n"), file=pathname)
> n <- countLines(pathname)
> stopifnot(n == length(bfr))
> 
> # File: Last line does not end with a new line
> writeString(paste(bfr, collapse="\n"), file=pathname)
> n <- countLines(pathname)
> stopifnot(n == length(bfr))
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Counting either CR, LF, or CRLF
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> for (newline in c("\r", "\n", "\r\n")) {
+   cat("Newline sequence:\n")
+   str(newline)
+   writeString(paste(bfr, collapse=newline), file=pathname)
+ 
+   # Reading from file
+   n <- countLines(pathname)
+   stopifnot(n == length(bfr))
+ 
+   # Reading from connection
+   con <- file(pathname, open="rb")
+   n <- countLines(con)
+   close(con)
+   stopifnot(n == length(bfr))
+ }
Newline sequence:
 chr "\r"
Newline sequence:
 chr "\n"
Newline sequence:
 chr "\r\n"
> 
> 
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> # Compressed files
> # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> pathnameGZ <- sprintf("%s.gz", pathname)
> for (newline in c("\r", "\n", "\r\n")) {
+   cat("Newline sequence:\n")
+   str(newline)
+ 
+   con <- gzfile(pathnameGZ, open="wb")
+   writeString(paste(bfr, collapse=newline), file=con)
+   close(con)
+ 
+   # Reading from file
+   n <- countLines(pathnameGZ)
+   stopifnot(n == length(bfr))
+   print(n)
+ 
+   # Reading from connection
+   con <- gzfile(pathname, open="rb")
+   n <- countLines(con)
+   close(con)
+   print(n)
+   stopifnot(n == length(bfr))
+ }
Newline sequence:
 chr "\r"
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
Newline sequence:
 chr "\n"
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
Newline sequence:
 chr "\r\n"
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
[1] 9
attr(,"lastLineHasNewline")
[1] FALSE
> 
> # Cleanup
> file.remove(pathnameGZ)
[1] TRUE
> file.remove(pathname)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   0.45    0.12    0.56