wc.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini wc implementation for busybox
   4  *
   5  * by Edward Betts <edward@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  *
  21  */
  22
  23 #include "internal.h"
  24 #include <stdio.h>
  25 #include <getopt.h>
  26
  27 static int total_lines, total_words, total_chars, max_length;
  28 static int print_lines, print_words, print_chars, print_length;
  29
  30 void print_counts(int lines, int words, int chars, int length,
  31                                   const char *name)
  32 {
  33         char const *space = "";
  34
  35         if (print_lines) {
  36                 printf("%7d", lines);
  37                 space = " ";
  38         }
  39         if (print_words) {
  40                 printf("%s%7d", space, words);
  41                 space = " ";
  42         }
  43         if (print_chars) {
  44                 printf("%s%7d", space, chars);
  45                 space = " ";
  46         }
  47         if (print_length)
  48                 printf("%s%7d", space, length);
  49         if (*name)
  50                 printf(" %s", name);
  51         putchar('\n');
  52 }
  53
  54 static void wc_file(FILE * file, const char *name)
  55 {
  56         int lines, words, chars, length;
  57         int in_word = 0, linepos = 0;
  58         int c;
  59
  60         lines = words = chars = length = 0;
  61         while ((c = getc(file)) != EOF) {
  62                 chars++;
  63                 switch (c) {
  64                 case '\n':
  65                         lines++;
  66                 case '\r':
  67                 case '\f':
  68                         if (linepos > length)
  69                                 length = linepos;
  70                         linepos = 0;
  71                         goto word_separator;
  72                 case '\t':
  73                         linepos += 8 - (linepos % 8);
  74                         goto word_separator;
  75                 case ' ':
  76                         linepos++;
  77                 case '\v':
  78                   word_separator:
  79                         if (in_word) {
  80                                 in_word = 0;
  81                                 words++;
  82                         }
  83                         break;
  84                 default:
  85                         linepos++;
  86                         in_word = 1;
  87                         break;
  88                 }
  89         }
  90         if (linepos > length)
  91                 length = linepos;
  92         if (in_word)
  93                 words++;
  94         print_counts(lines, words, chars, length, name);
  95         total_lines += lines;
  96         total_words += words;
  97         total_chars += chars;
  98         if (length > max_length)
  99                 max_length = length;
 100         fclose(file);
 101         fflush(stdout);
 102 }
 103
 104 int wc_main(int argc, char **argv)
 105 {
 106         FILE *file;
 107         unsigned int num_files_counted = 0;
 108         int opt;
 109
 110         total_lines = total_words = total_chars = max_length = 0;
 111         print_lines = print_words = print_chars = print_length = 0;
 112
 113         while ((opt = getopt(argc, argv, "clLw")) > 0) {
 114                         switch (opt) {
 115                         case 'c':
 116                                 print_chars = 1;
 117                                 break;
 118                         case 'l':
 119                                 print_lines = 1;
 120                                 break;
 121                         case 'L':
 122                                 print_length = 1;
 123                                 break;
 124                         case 'w':
 125                                 print_words = 1;
 126                                 break;
 127                         default:
 128                                 usage(wc_usage);
 129                         }
 130         }
 131
 132         if (!print_lines && !print_words && !print_chars && !print_length)
 133                 print_lines = print_words = print_chars = 1;
 134
 135         if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
 136                 wc_file(stdin, "");
 137                 exit(TRUE);
 138         } else {
 139                 while (optind < argc) {
 140                         file = fopen(argv[optind], "r");
 141                         if (file == NULL) {
 142                                 fatalError(argv[optind]);
 143                         }
 144                         wc_file(file, argv[optind]);
 145                         num_files_counted++;
 146                         optind++;
 147                 }
 148         }
 149
 150         if (num_files_counted > 1)
 151                 print_counts(total_lines, total_words, total_chars,
 152                                          max_length, "total");
 153
 154         return 0 ;
 155 }