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wc: Add -L option to show the length of the longest line

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If more than one file is specified on the command line and the `-L`
option is used, the totals field will show the longest line
encountered; it is not a sum like the other values.
This commit is contained in:
Tim Ledbetter 2023-06-22 22:30:27 +01:00 committed by Andreas Kling
parent 8e52d1125d
commit 702054dcbc
Notes: sideshowbarker 2024-07-17 16:23:55 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/702054dcbc
Pull-request: https://github.com/SerenityOS/serenity/pull/19568
2 changed files with 19 additions and 3 deletions
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3
Base/usr/share/man/man1/wc.md
View File

@ -5,7 +5,7 @@ wc - word, line, character, and byte count
## Synopsis
```sh
$ wc [--lines] [--bytes] [--words] [file...]
$ wc [--lines] [--bytes] [--words] [--max-line-length] [file...]
```
## Options
@ -15,6 +15,7 @@ $ wc [--lines] [--bytes] [--words] [file...]
* `-l`, `--lines`: Output line count
* `-c`, `--bytes`: Output byte count
* `-w`, `--words`: Output word count
* `-L`, `--max-line-length`: Output byte count of the longest line
## Arguments

19
Userland/Utilities/wc.cpp
View File

@ -22,12 +22,14 @@ struct Count {
unsigned lines { 0 };
unsigned characters { 0 };
unsigned words { 0 };
unsigned max_line_length { 0 };
size_t bytes { 0 };
};
bool g_output_line = false;
bool g_output_byte = false;
bool g_output_word = false;
bool g_output_max_line_length = false;
static void wc_out(Count const& count)
{
@ -37,6 +39,8 @@ static void wc_out(Count const& count)
out("{:7} ", count.words);
if (g_output_byte)
out("{:7} ", count.bytes);
if (g_output_max_line_length)
out("{:7} ", count.max_line_length);
outln("{:>14}", count.name);
}
@ -58,14 +62,22 @@ static ErrorOr<Count> get_count(StringView file_specifier)
count.name = file_specifier;
bool start_a_new_word = true;
unsigned current_line_length = 0;
u8 ch;
for (Bytes bytes = TRY(file->read_some({ &ch, 1 })); bytes.size() != 0; bytes = TRY(file->read_some(bytes))) {
count.bytes++;
if (ch != '\n')
current_line_length++;
if (is_ascii_space(ch)) {
start_a_new_word = true;
if (ch == '\n')
if (ch == '\n') {
count.lines++;
if (current_line_length > count.max_line_length)
count.max_line_length = current_line_length;
current_line_length = 0;
}
} else if (start_a_new_word) {
start_a_new_word = false;
count.words++;
@ -83,6 +95,8 @@ static Count get_total_count(Vector<Count> const& counts)
total_count.words += count.words;
total_count.characters += count.characters;
total_count.bytes += count.bytes;
if (count.max_line_length > total_count.max_line_length)
total_count.max_line_length = count.max_line_length;
}
return total_count;
}
@ -97,10 +111,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_option(g_output_line, "Output line count", "lines", 'l');
args_parser.add_option(g_output_byte, "Output byte count", "bytes", 'c');
args_parser.add_option(g_output_word, "Output word count", "words", 'w');
args_parser.add_option(g_output_max_line_length, "Output byte count of the longest line", "max-line-length", 'L');
args_parser.add_positional_argument(file_specifiers, "File to process", "file", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
if (!g_output_line && !g_output_byte && !g_output_word)
if (!g_output_line && !g_output_byte && !g_output_word && !g_output_max_line_length)
g_output_line = g_output_byte = g_output_word = true;
Vector<Count> counts;