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Userland: Add optional human readable output to /bin/df

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/bin/df now allows the operator to view human readable
output using `-h` or `--human-readable` optional flags.
This commit is contained in:
Brendan Coles 2020-03-31 06:52:31 +00:00 committed by Andreas Kling
parent 7bd077a3ae
commit d64589101c
Notes: sideshowbarker 2024-07-19 08:02:31 +09:00 
Author: https://github.com/bcoles 🔰
Commit: https://github.com/SerenityOS/serenity/commit/d64589101cb
Pull-request: https://github.com/SerenityOS/serenity/pull/1547
Issue: https://github.com/SerenityOS/serenity/issues/735
1 changed files with 47 additions and 5 deletions
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52
Userland/df.cpp
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@ -28,29 +28,62 @@
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <cstring>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static bool flag_human_readable = false;
struct FileSystem {
String fs;
size_t total_block_count { 0 };
size_t free_block_count { 0 };
size_t total_inode_count { 0 };
size_t free_inode_count { 0 };
size_t block_size { 0 };
String mount_point;
};
int main(int, char**)
// FIXME: Remove this hackery once printf() supports floats.
// FIXME: Also, we should probably round the sizes in df -h output.
static String number_string_with_one_decimal(float number, const char* suffix)
{
float decimals = number - (int)number;
return String::format("%d.%d%s", (int)number, (int)(decimals * 10), suffix);
}
static String human_readable_size(size_t size)
{
if (size < 1 * KB)
return String::number(size);
if (size < 1 * MB)
return number_string_with_one_decimal((float)size / (float)KB, "K");
if (size < 1 * GB)
return number_string_with_one_decimal((float)size / (float)MB, "M");
return number_string_with_one_decimal((float)size / (float)GB, "G");
}
int main(int argc, char** argv)
{
Core::ArgsParser args_parser;
args_parser.add_option(flag_human_readable, "Print human-readable sizes", "human-readable", 'h');
args_parser.parse(argc, argv);
auto file = Core::File::construct("/proc/df");
if (!file->open(Core::IODevice::ReadOnly)) {
fprintf(stderr, "Failed to open /proc/df: %s\n", file->error_string());
return 1;
}
printf("Filesystem Blocks Used Available Mount point\n");
if (flag_human_readable) {
printf("Filesystem Size Used Available Mount point\n");
} else {
printf("Filesystem Blocks Used Available Mount point\n");
}
auto file_contents = file->read_all();
auto json = JsonValue::from_string(file_contents).as_array();
@ -61,15 +94,24 @@ int main(int, char**)
auto free_block_count = fs_object.get("free_block_count").to_u32();
auto total_inode_count = fs_object.get("total_inode_count").to_u32();
auto free_inode_count = fs_object.get("free_inode_count").to_u32();
auto block_size = fs_object.get("block_size").to_u32();
auto mount_point = fs_object.get("mount_point").to_string();
(void)total_inode_count;
(void)free_inode_count;
printf("%-10s", fs.characters());
printf("%10u ", total_block_count);
printf("%10u ", total_block_count - free_block_count);
printf("%10u ", free_block_count);
if (flag_human_readable) {
printf("%10s ", human_readable_size(total_block_count * block_size).characters());
printf("%10s ", human_readable_size((total_block_count - free_block_count) * block_size).characters());
printf("%10s ", human_readable_size(free_block_count * block_size).characters());
} else {
printf("%10u ", total_block_count);
printf("%10u ", total_block_count - free_block_count);
printf("%10u ", free_block_count);
}
printf("%s", mount_point.characters());
printf("\n");
});