wc

wc.c

#include <stdio.h>
#include <sys/stat.h>

int main(int argc, char *argv[]) {

  if (argc == 1) {
    return 0;
  }

  int tc = 0,
      tl = 0,
      tw = 0,
      i;

  for (i = 1; i < argc; i++) {

    int characters = 0,
        lines = 0,
        words = 0;

    char lastchar = '\n',
         c;

    struct stat buf;
    stat(argv[i], &buf);
    if (S_ISDIR(buf.st_mode) == 1) {
      printf("wc: %s: Is a directory\n", argv[i]);
      printf(" 0  0  0 %s\n", argv[i]);
      continue;
    }

    FILE *doc = fopen(argv[i], "r");
    if (doc == 0) {
      printf("wc: %s: No such file or directory\n", argv[i]);
      continue;
    }

    while((c = fgetc(doc)) != EOF) {
      switch (c) {
        case '\n':
          lines++;
          break;
        case ' ':
          if (lastchar != ' ') {
            words++;
          }
          break;
        default:
          if (lastchar == '\n') {
            words++;
          }
      }
      lastchar = c;
      characters++;
    }

    printf(" %6d  %4d %6d %s\n", lines, words, characters, argv[1]);
    tc += characters;
    tl += lines;
    tw += words;

    if (fclose(doc) != 0) {
      printf("Error closing file\n");
      return 1;
    }

  }

  if (argc > 2) {
    printf(" %6d  %4d %6d  total\n", tl, tw, tc);
  }

  return 0;

}