LXR toybox/toys/posix/wc.c

   1/* wc.c - Word count
   2 *
   3 * Copyright 2011 Rob Landley <rob@landley.net>
   4 *
   5 * See http://opengroup.org/onlinepubs/9699919799/utilities/wc.html
   6
   7USE_WC(NEWTOY(wc, "mcwl", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE))
   8
   9config WC
  10  bool "wc"
  11  default y
  12  help
  13    usage: wc -lwcm [FILE...]
  14
  15    Count lines, words, and characters in input.
  16
  17    -l  show lines
  18    -w  show words
  19    -c  show bytes
  20    -m  show characters
  21
  22    By default outputs lines, words, bytes, and filename for each
  23    argument (or from stdin if none). Displays only either bytes
  24    or characters.
  25*/
  26
  27#define FOR_wc
  28#include "toys.h"
  29
  30GLOBALS(
  31  unsigned long totals[4];
  32)
  33
  34static void show_lengths(unsigned long *lengths, char *name)
  35{
  36  int i, space = 7, first = 1;
  37
  38  for (i = 0; i<4; i++) if (toys.optflags == (1<<i)) space = 0;
  39  for (i = 0; i<4; i++) {
  40    if (toys.optflags&(1<<i)) {
  41      printf(" %*ld"+first, space, lengths[i]);
  42      first = 0;
  43    }
  44    TT.totals[i] += lengths[i];
  45  }
  46  if (*toys.optargs) printf(" %s", name);
  47  xputc('\n');
  48}
  49
  50static void do_wc(int fd, char *name)
  51{
  52  int len = 0, clen = 1, space = 0;
  53  unsigned long word = 0, lengths[] = {0,0,0,0};
  54
  55  // Speed up common case: wc -c normalfile is file length.
  56  if (toys.optflags == FLAG_c) {
  57    struct stat st;
  58
  59    // On Linux, files in /proc often report their size as 0.
  60    if (!fstat(fd, &st) && S_ISREG(st.st_mode) && st.st_size) {
  61      lengths[2] = st.st_size;
  62      goto show;
  63    }
  64  }
  65
  66  for (;;) {
  67    int pos, done = 0, len2 = read(fd, toybuf+len, sizeof(toybuf)-len);
  68
  69    if (len2<0) perror_msg_raw(name);
  70    else len += len2;
  71    if (len2<1) done++;
  72
  73    for (pos = 0; pos<len; pos++) {
  74      if (toybuf[pos]=='\n') lengths[0]++;
  75      lengths[2]++;
  76      if (toys.optflags&FLAG_m) {
  77        // If we've consumed next wide char
  78        if (--clen<1) {
  79          wchar_t wchar;
  80
  81          // next wide size, don't count invalid, fetch more data if necessary
  82          clen = utf8towc(&wchar, toybuf+pos, len-pos);
  83          if (clen == -1) continue;
  84          if (clen == -2 && !done) break;
  85
  86          lengths[3]++;
  87          space = iswspace(wchar);
  88        }
  89      } else space = isspace(toybuf[pos]);
  90
  91      if (space) word=0;
  92      else {
  93        if (!word) lengths[1]++;
  94        word=1;
  95      }
  96    }
  97    if (done) break;
  98    if (pos != len) memmove(toybuf, toybuf+pos, len-pos);
  99    len -= pos;
 100  }
 101
 102show:
 103  show_lengths(lengths, name);
 104}
 105
 106void wc_main(void)
 107{
 108  if (!toys.optflags) toys.optflags = FLAG_l|FLAG_w|FLAG_c;
 109  loopfiles(toys.optargs, do_wc);
 110  if (toys.optc>1) show_lengths(TT.totals, "total");
 111}
 112