* Remove the author copyright notices
Rational:
* not maintained
* does not reflect reality
* don't provide any value (the info can be found in the git log)
* we don't have rules to update them
(ex: should you update it after one line, two lines, etc)
Co-authored-by: Daniel Hofstetter <daniel.hofstetter@42dh.com>
Add support for the `iflag=nocache` and `oflag=nocache` to make `dd`
discard the filesystem cache for the processed portion of the input or
output file.
Add the `Input::discard_cache()` and `Output::discard_cache()`
functions. These allow discarding the filesystem cache when `dd` no
longer needs to access a specified portion of the input or output
file, respectively.
Improve the display of the total time spent transferring bytes so that
the number of seconds is displayed using the `%g` format specifier as
in `printf`. This matches the behavior of GNU `dd`.
Before this commit, the precision was always set to one digit after
the decimal point. For example,
$ dd count=100000 if=/dev/zero of=/dev/null
100000+0 records in
100000+0 records out
51200000 bytes (51 MB, 49 MiB) copied, 0.2 s, 268.1 MB/s
After this commit, the precision increases dynamically as the duration
decreases. For example,
$ dd count=100000 if=/dev/zero of=/dev/null
100000+0 records in
100000+0 records out
51200000 bytes (51 MB, 49 MiB) copied, 0.1019 s, 507 MB/s
$ dd count=1000 if=/dev/zero of=/dev/null
1000+0 records in
1000+0 records out
512000 bytes (512 kB, 500 KiB) copied, 0.002663 s, 256 MB/s
$ dd count=10 if=/dev/zero of=/dev/null
10+0 records in
10+0 records out
5120 bytes (5.1 kB, 5.0 KiB) copied, 0.000182 s, 5.1 MB/s
Open stdin using its file descriptor so that a `dd skip=N` command in
a subshell does not consume all bytes from stdin.
For example, before this commit, multiple instances of `dd` reading
from stdin and appearing in a single command line would incorrectly
result in an empty stdin for each instance of `dd` after the first:
$ printf "abcdef\n" | (dd bs=1 skip=3 count=0 && dd) 2> /dev/null
# incorrectly results in no output
After this commit, the `dd skip=3` process reads three bytes from the
file descriptor referring to stdin without draining the remaining
three bytes when it terminates:
$ printf "abcdef\n" | (dd bs=1 skip=3 count=0 && dd) 2> /dev/null
def
Move the `dd_out()` function out of the `impl Output` and up to the
module level, renaming it to `dd_copy()`. This change aligns it with
the pattern set by `std::io::copy()`, which similarly takes an input
reader and an output writer.
This does not change the behavior of `dd`, just the code organization
to make it more closely match the idioms in the Rust standard library.
This mirrors a recent commit that introduced the `Dest` enum and a
simplified `Output` struct. These changes allow us to add new types of
inputs and output more easily.
