wc.c

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/* wc - count lines, words and characters       Author: David Messer */

#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>

/*
 *
 *      Usage:  wc [-lwc] [names]
 *
 *              Flags:
 *                      l - count lines.
 *                      w - count words.
 *                      c - count characters.
 *
 *              Flags l, w, and c are default.
 *              Words are delimited by any non-alphabetic character.
 *
 *  Released into the PUBLIC-DOMAIN 02/10/86
 *
 *      If you find this program to be of use to you, a donation of
 *      whatever you think it is worth will be cheerfully accepted.
 *
 *      Written by: David L. Messer
 *                              P.O. Box 19130, Mpls, MN,  55119
 *      Program (heavily) modified by Andy Tanenbaum
 */


int lflag;                      /* Count lines */
int wflag;                      /* Count words */
int cflag;                      /* Count characters */

long lcount;                    /* Count of lines */
long wcount;                    /* Count of words */
long ccount;                    /* Count of characters */

long ltotal;                    /* Total count of lines */
long wtotal;                    /* Total count of words */
long ctotal;                    /* Total count of characters */

_PROTOTYPE(int main, (int argc, char **argv));
_PROTOTYPE(void count, (FILE *f));
_PROTOTYPE(void usage, (void));

int main(argc, argv)
int argc;
char *argv[];
{
  int k;
  char *cp;
  int tflag, files;

  /* Get flags. */
  files = argc - 1;
  k = 1;
  cp = argv[1];
  if (argc > 1 && *cp++ == '-') {
        files--;
        k++;                    /* points to first file */
        while (*cp != 0) {
                switch (*cp) {
                    case 'l':   lflag++;        break;
                    case 'w':   wflag++;        break;
                    case 'c':   cflag++;        break;
                    default:    usage();
                }
                cp++;
        }
  }

  /* If no flags are set, treat as wc -lwc. */
  if (!lflag && !wflag && !cflag) {
        lflag = 1;
        wflag = 1;
        cflag = 1;
  }

  /* Process files. */
  tflag = files >= 2;           /* set if # files > 1 */

  /* Check to see if input comes from std input. */
  if (k >= argc) {
        count(stdin);
        if (lflag) printf(" %6ld", lcount);
        if (wflag) printf(" %6ld", wcount);
        if (cflag) printf(" %6ld", ccount);
        printf(" \n");
        fflush(stdout);
        exit(0);
  }

  /* There is an explicit list of files.  Loop on files. */
  while (k < argc) {
        FILE *f;

        if ((f = fopen(argv[k], "r")) == NULL) {
                fprintf(stderr, "wc: cannot open %s\n", argv[k]);
        } else {
                count(f);
                if (lflag) printf(" %6ld", lcount);
                if (wflag) printf(" %6ld", wcount);
                if (cflag) printf(" %6ld", ccount);
                printf(" %s\n", argv[k]);
                fclose(f);
        }
        k++;
  }

  if (tflag) {
        if (lflag) printf(" %6ld", ltotal);
        if (wflag) printf(" %6ld", wtotal);
        if (cflag) printf(" %6ld", ctotal);
        printf(" total\n");
  }
  fflush(stdout);
  return(0);
}

void count(f)
FILE *f;
{
  register int c;
  register int word = 0;

  lcount = 0;
  wcount = 0;
  ccount = 0L;

  while ((c = getc(f)) != EOF) {
        ccount++;

        if (isspace(c)) {
                if (word) wcount++;
                word = 0;
        } else {
                word = 1;
        }

        if (c == '\n' || c == '\f') lcount++;
  }
  ltotal += lcount;
  wtotal += wcount;
  ctotal += ccount;
}

void usage()
{
  fprintf(stderr, "Usage: wc [-lwc] [name ...]\n");
  exit(1);
}

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