Previously, individual file sizes were used to compute the number width, which
would cause misalignment when the total has a greater number of digits, and is
different from the behavior of GNU wc
```
$ ./target/debug/wc -w -l -m -c -L deny.toml GNUmakefile
95 422 3110 3110 85 deny.toml
349 865 6996 6996 196 GNUmakefile
444 1287 10106 10106 196 total
$ wc -w -l -m -c -L deny.toml GNUmakefile
95 422 3110 3110 85 deny.toml
349 865 6996 6996 196 GNUmakefile
444 1287 10106 10106 196 total
```
When this option is present, the files argument is not processed. This option processes the file list from provided file, splitting them by the ascii NUL (\0) character. When files0-from is '-', the file list is processed from stdin.
Errors are now always shown with the corresponding filename.
Errors are no longer converted into warnings. Previously `wc < .`
would cause a loop.
Checking whether something is a directory is no longer done in
advance. This removes race conditions and the edge case where stdin is
a directory.
The custom error type is removed because io::Error is now enough.
Fix two issues with the string formatting width for counts displayed
by `wc`.
First, the output was previously not using the default minimum width
(seven characters) when reading from `stdin`. This commit corrects
this behavior to match GNU `wc`. For example,
$ cat alice_in_wonderland.txt | wc
5 57 302
Second, if at least 10^7 bytes were read from `stdin` *after* reading
from a smaller regular file, then every output row would have width
8. This disagrees with GNU `wc`, in which only the `stdin` row and the
total row would have width 8. This commit corrects this behavior to
match GNU `wc`. For example,
$ printf "%.0s0" {1..10000000} | wc emptyfile.txt -
0 0 0 emptyfile.txt
0 1 10000000
0 1 10000000 total
Fixes#2186.
Change the error messages that get printed to `stderr` for compatibility
with GNU `wc` when an input is a directory and when an input does not
exist.
Fixes#2211.
* cat: Unrevert splice patch
* cat: Add fifo test
* cat: Add tests for error cases
* cat: Add tests for character devices
* wc: Make sure we handle short splice writes
* cat: Fix tests for 1.40.0 compiler
* cat: Run rustfmt on test_cat.rs
* Run 'cargo +1.40.0 update'
* wc: Don't read() if we only need to count number of bytes
* Resolve a few code review comments
* Use write macros instead of print
* Fix wc tests in case only one thing is printed
* wc: Fix style
* wc: Use return value of first splice rather than second
* wc: Make main loop more readable
* wc: Don't unwrap on failed write to stdout
* wc: Increment error count when stats fail to print
* Re-add Cargo.lock
