wc.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini wc implementation for busybox
   4  *
   5  * Copyright (C) 2000  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 <stdio.h>
  24 #include <getopt.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include "busybox.h"
  28
  29 static int total_lines, total_words, total_chars, max_length;
  30 static int print_lines, print_words, print_chars, print_length;
  31
  32 static void print_counts(int lines, int words, int chars, int length,
  33                                                  const char *name)
  34 {
  35         char const *space = "";
  36
  37         if (print_lines) {
  38                 printf("%7d", lines);
  39                 space = " ";
  40         }
  41         if (print_words) {
  42                 printf("%s%7d", space, words);
  43                 space = " ";
  44         }
  45         if (print_chars) {
  46                 printf("%s%7d", space, chars);
  47                 space = " ";
  48         }
  49         if (print_length)
  50                 printf("%s%7d", space, length);
  51         if (*name)
  52                 printf(" %s", name);
  53         putchar('\n');
  54 }
  55
  56 static void wc_file(FILE * file, const char *name)
  57 {
  58         int lines, words, chars, length;
  59         int in_word = 0, linepos = 0;
  60         int c;
  61
  62         lines = words = chars = length = 0;
  63         while ((c = getc(file)) != EOF) {
  64                 chars++;
  65                 switch (c) {
  66                 case '\n':
  67                         lines++;
  68                 case '\r':
  69                 case '\f':
  70                         if (linepos > length)
  71                                 length = linepos;
  72                         linepos = 0;
  73                         goto word_separator;
  74                 case '\t':
  75                         linepos += 8 - (linepos % 8);
  76                         goto word_separator;
  77                 case ' ':
  78                         linepos++;
  79                 case '\v':
  80                   word_separator:
  81                         if (in_word) {
  82                                 in_word = 0;
  83                                 words++;
  84                         }
  85                         break;
  86                 default:
  87                         linepos++;
  88                         in_word = 1;
  89                         break;
  90                 }
  91         }
  92         if (linepos > length)
  93                 length = linepos;
  94         if (in_word)
  95                 words++;
  96         print_counts(lines, words, chars, length, name);
  97         total_lines += lines;
  98         total_words += words;
  99         total_chars += chars;
 100         if (length > max_length)
 101                 max_length = length;
 102         fclose(file);
 103         fflush(stdout);
 104 }
 105
 106 int wc_main(int argc, char **argv)
 107 {
 108         FILE *file;
 109         unsigned int num_files_counted = 0;
 110         int opt, status = EXIT_SUCCESS;
 111
 112         total_lines = total_words = total_chars = max_length = 0;
 113         print_lines = print_words = print_chars = print_length = 0;
 114
 115         while ((opt = getopt(argc, argv, "clLw")) > 0) {
 116                         switch (opt) {
 117                         case 'c':
 118                                 print_chars = 1;
 119                                 break;
 120                         case 'l':
 121                                 print_lines = 1;
 122                                 break;
 123                         case 'L':
 124                                 print_length = 1;
 125                                 break;
 126                         case 'w':
 127                                 print_words = 1;
 128                                 break;
 129                         default:
 130                                 show_usage();
 131                         }
 132         }
 133
 134         if (!print_lines && !print_words && !print_chars && !print_length)
 135                 print_lines = print_words = print_chars = 1;
 136
 137         if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
 138                 wc_file(stdin, "");
 139                 return EXIT_SUCCESS;
 140         } else {
 141                 while (optind < argc) {
 142                         if ((file = wfopen(argv[optind], "r")) != NULL)
 143                                 wc_file(file, argv[optind]);
 144                         else
 145                                 status = EXIT_FAILURE;
 146                         num_files_counted++;
 147                         optind++;
 148                 }
 149         }
 150
 151         if (num_files_counted > 1)
 152                 print_counts(total_lines, total_words, total_chars,
 153                                          max_length, "total");
 154
 155         return status;
 156 }