coreutils/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
  26 static const char wc_usage[] = "wc [OPTION]... [FILE]...\n\n"
  27         "Print line, word, and byte counts for each FILE, and a total line if\n"
  28         "more than one FILE is specified.  With no FILE, read standard input.\n\n"
  29         "Options:\n"
  30         "\t-c\tprint the byte counts\n"
  31         "\t-l\tprint the newline counts\n"
  32
  33         "\t-L\tprint the length of the longest line\n"
  34         "\t-w\tprint the word counts\n";
  35
  36 static int total_lines, total_words, total_chars, max_length;
  37 static int print_lines, print_words, print_chars, print_length;
  38
  39 void print_counts(int lines, int words, int chars, int length,
  40                                   const char *name)
  41 {
  42         char const *space = "";
  43
  44         if (print_lines) {
  45                 printf("%7d", lines);
  46                 space = " ";
  47         }
  48         if (print_words) {
  49                 printf("%s%7d", space, words);
  50                 space = " ";
  51         }
  52         if (print_chars) {
  53                 printf("%s%7d", space, chars);
  54                 space = " ";
  55         }
  56         if (print_length)
  57                 printf("%s%7d", space, length);
  58         if (*name)
  59                 printf(" %s", name);
  60         putchar('\n');
  61 }
  62
  63 static void wc_file(FILE * file, const char *name)
  64 {
  65         int lines, words, chars, length;
  66         int in_word = 0, linepos = 0;
  67         int c;
  68
  69         lines = words = chars = length = 0;
  70         while ((c = getc(file)) != EOF) {
  71                 chars++;
  72                 switch (c) {
  73                 case '\n':
  74                         lines++;
  75                 case '\r':
  76                 case '\f':
  77                         if (linepos > length)
  78                                 length = linepos;
  79                         linepos = 0;
  80                         goto word_separator;
  81                 case '\t':
  82                         linepos += 8 - (linepos % 8);
  83                         goto word_separator;
  84                 case ' ':
  85                         linepos++;
  86                 case '\v':
  87                   word_separator:
  88                         if (in_word) {
  89                                 in_word = 0;
  90                                 words++;
  91                         }
  92                         break;
  93                 default:
  94                         linepos++;
  95                         in_word = 1;
  96                         break;
  97                 }
  98         }
  99         if (linepos > length)
 100                 length = linepos;
 101         if (in_word)
 102                 words++;
 103         print_counts(lines, words, chars, length, name);
 104         total_lines += lines;
 105         total_words += words;
 106         total_chars += chars;
 107         if (length > max_length)
 108                 max_length = length;
 109         fclose(file);
 110         fflush(stdout);
 111 }
 112
 113 int wc_main(int argc, char **argv)
 114 {
 115         FILE *file;
 116
 117         total_lines = total_words = total_chars = max_length = 0;
 118         print_lines = print_words = print_chars = print_length = 0;
 119
 120         while (--argc && **(++argv) == '-') {
 121                 while (*++(*argv))
 122                         switch (**argv) {
 123                         case 'c':
 124                                 print_chars = 1;
 125                                 break;
 126                         case 'l':
 127                                 print_lines = 1;
 128                                 break;
 129                         case 'L':
 130                                 print_length = 1;
 131                                 break;
 132                         case 'w':
 133                                 print_words = 1;
 134                                 break;
 135                         default:
 136                                 usage(wc_usage);
 137                         }
 138         }
 139
 140         if (!print_lines && !print_words && !print_chars && !print_length)
 141                 print_lines = print_words = print_chars = 1;
 142
 143         if (argc == 0) {
 144                 wc_file(stdin, "");
 145                 exit(TRUE);
 146         } else if (argc == 1) {
 147                 file = fopen(*argv, "r");
 148                 if (file == NULL) {
 149                         perror(*argv);
 150                         exit(FALSE);
 151                 }
 152                 wc_file(file, *argv);
 153         } else {
 154                 while (argc-- > 0 && *argv != '\0' && strlen(*argv)) {
 155                         file = fopen(*argv, "r");
 156                         if (file == NULL) {
 157                                 perror(*argv);
 158                                 exit(FALSE);
 159                         }
 160                         wc_file(file, *argv);
 161                         argv++;
 162                 }
 163                 print_counts(total_lines, total_words, total_chars,
 164                                          max_length, "total");
 165         }
 166         exit(TRUE);
 167 }