busybox/wc.c
Mark Whitley 3950596e1e Converted option parsing to using getopt(). Also managed to remove an
extraneous logic loop that existed only for the purpose of the special case of
only one file. I replaced it with a variable to keep track of the number of
files read.
2000-07-20 00:08:10 +00:00

156 lines
3.3 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini wc implementation for busybox
*
* by Edward Betts <edward@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "internal.h"
#include <stdio.h>
#include <getopt.h>
static int total_lines, total_words, total_chars, max_length;
static int print_lines, print_words, print_chars, print_length;
void print_counts(int lines, int words, int chars, int length,
const char *name)
{
char const *space = "";
if (print_lines) {
printf("%7d", lines);
space = " ";
}
if (print_words) {
printf("%s%7d", space, words);
space = " ";
}
if (print_chars) {
printf("%s%7d", space, chars);
space = " ";
}
if (print_length)
printf("%s%7d", space, length);
if (*name)
printf(" %s", name);
putchar('\n');
}
static void wc_file(FILE * file, const char *name)
{
int lines, words, chars, length;
int in_word = 0, linepos = 0;
int c;
lines = words = chars = length = 0;
while ((c = getc(file)) != EOF) {
chars++;
switch (c) {
case '\n':
lines++;
case '\r':
case '\f':
if (linepos > length)
length = linepos;
linepos = 0;
goto word_separator;
case '\t':
linepos += 8 - (linepos % 8);
goto word_separator;
case ' ':
linepos++;
case '\v':
word_separator:
if (in_word) {
in_word = 0;
words++;
}
break;
default:
linepos++;
in_word = 1;
break;
}
}
if (linepos > length)
length = linepos;
if (in_word)
words++;
print_counts(lines, words, chars, length, name);
total_lines += lines;
total_words += words;
total_chars += chars;
if (length > max_length)
max_length = length;
fclose(file);
fflush(stdout);
}
int wc_main(int argc, char **argv)
{
FILE *file;
unsigned int num_files_counted = 0;
int opt;
total_lines = total_words = total_chars = max_length = 0;
print_lines = print_words = print_chars = print_length = 0;
while ((opt = getopt(argc, argv, "clLw")) > 0) {
switch (opt) {
case 'c':
print_chars = 1;
break;
case 'l':
print_lines = 1;
break;
case 'L':
print_length = 1;
break;
case 'w':
print_words = 1;
break;
default:
usage(wc_usage);
}
}
if (!print_lines && !print_words && !print_chars && !print_length)
print_lines = print_words = print_chars = 1;
if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
wc_file(stdin, "");
exit(TRUE);
} else {
while (optind < argc) {
file = fopen(argv[optind], "r");
if (file == NULL) {
fatalError(argv[optind]);
}
wc_file(file, argv[optind]);
num_files_counted++;
optind++;
}
}
if (num_files_counted > 1)
print_counts(total_lines, total_words, total_chars,
max_length, "total");
return 0 ;
}