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