coreutils/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 enum print_e {
  30         print_lines = 1,
  31         print_words = 2,
  32         print_chars = 4,
  33         print_length = 8
  34 };
  35
  36 static unsigned int total_lines = 0;
  37 static unsigned int total_words = 0;
  38 static unsigned int total_chars = 0;
  39 static unsigned int max_length = 0;
  40 static char print_type = 0;
  41
  42 static void print_counts(const unsigned int lines, const unsigned int words,
  43         const unsigned int chars, const unsigned int length, const char *name)
  44 {
  45         if (print_type & print_lines) {
  46                 printf("%7d ", lines);
  47         }
  48         if (print_type & print_words) {
  49                 printf("%7d ", words);
  50         }
  51         if (print_type & print_chars) {
  52                 printf("%7d ", chars);
  53         }
  54         if (print_type & print_length) {
  55                 printf("%7d ", length);
  56         }
  57         if (*name) {
  58                 printf("%s", name);
  59         }
  60         putchar('\n');
  61 }
  62
  63 static void wc_file(FILE * file, const char *name)
  64 {
  65         unsigned int lines = 0;
  66         unsigned int words = 0;
  67         unsigned int chars = 0;
  68         unsigned int length = 0;
  69         unsigned int linepos = 0;
  70         char in_word = 0;
  71         int c;
  72
  73         while ((c = getc(file)) != EOF) {
  74                 chars++;
  75                 switch (c) {
  76                 case '\n':
  77                         lines++;
  78                 case '\r':
  79                 case '\f':
  80                         if (linepos > length)
  81                                 length = linepos;
  82                         linepos = 0;
  83                         goto word_separator;
  84                 case '\t':
  85                         linepos += 8 - (linepos % 8);
  86                         goto word_separator;
  87                 case ' ':
  88                         linepos++;
  89                 case '\v':
  90 word_separator:
  91                         if (in_word) {
  92                                 in_word = 0;
  93                                 words++;
  94                         }
  95                         break;
  96                 default:
  97                         linepos++;
  98                         in_word = 1;
  99                         break;
 100                 }
 101         }
 102         if (linepos > length) {
 103                 length = linepos;
 104         }
 105         if (in_word) {
 106                 words++;
 107         }
 108         print_counts(lines, words, chars, length, name);
 109         total_lines += lines;
 110         total_words += words;
 111         total_chars += chars;
 112         if (length > max_length) {
 113                 max_length = length;
 114         }
 115 }
 116
 117 int wc_main(int argc, char **argv)
 118 {
 119         int opt;
 120
 121         while ((opt = getopt(argc, argv, "clLw")) > 0) {
 122                 switch (opt) {
 123                         case 'c':
 124                                 print_type |= print_chars;
 125                                 break;
 126                         case 'l':
 127                                 print_type |= print_lines;
 128                                 break;
 129                         case 'L':
 130                                 print_type |= print_length;
 131                                 break;
 132                         case 'w':
 133                                 print_type |= print_words;
 134                                 break;
 135                         default:
 136                                 show_usage();
 137                 }
 138         }
 139
 140         if (print_type == 0) {
 141                 print_type = print_lines | print_words | print_chars;
 142         }
 143
 144         if (argv[optind] == NULL || strcmp(argv[optind], "-") == 0) {
 145                 wc_file(stdin, "");
 146         } else {
 147                 unsigned short num_files_counted = 0;
 148                 while (optind < argc) {
 149                         if (print_type == print_chars) {
 150                                 struct stat statbuf;
 151                                 stat(argv[optind], &statbuf);
 152                                 print_counts(0, 0, statbuf.st_size, 0, argv[optind]);
 153                                 total_chars += statbuf.st_size;
 154                         } else {
 155                                 FILE *file;
 156                                 file = xfopen(argv[optind], "r");
 157                                 wc_file(file, argv[optind]);
 158                                 fclose(file);
 159                         }
 160                         optind++;
 161                         num_files_counted++;
 162                 }
 163                 if (num_files_counted > 1) {
 164                         print_counts(total_lines, total_words, total_chars, max_length, "total");
 165                 }
 166         }
 167
 168         return(EXIT_SUCCESS);
 169 }